To see the other types of publications on this topic, follow the link: AGN activity.
Dissertations / Theses on the topic 'AGN activity'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'AGN activity.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Blank, Marvin, and Wolfgang J. Duschl. "Viscous time lags between starburst and AGN activity." OXFORD UNIV PRESS, 2016. http://hdl.handle.net/10150/621734.
Full textAbstract:
There is strong observational evidence indicating a time lag of order of some 100 Myr between the onset of starburst and AGN activity in galaxies. Dynamical time lags have been invoked to explain this. We extend this approach by introducing a viscous time lag the gas additionally needs to flow through the AGN's accretion disc before it reaches the central black hole. Our calculations reproduce the observed time lags and are in accordance with the observed correlation between black hole mass and stellar velocity dispersion.
2
Molnár, Dániel Csaba. "Tracing star formation and AGN activity at radio frequencies." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/79453/.
Full textAbstract:
My research has focused on locating and measuring star formation and AGN activity in different environments with interferometric and single-dish radio observations. As my first PhD project, I studied the complex interaction between an intermediate redshift (z 0.3) starburst galaxy and a nearby ( 7 kpc separation) QSO using sub-arcsecond VLA observations. I found new evidence for jet-induced star formation activity in the companion galaxy, making the system a strong candidate for this rare, and potentially important process in the early Universe. In my second paper, I investigated the infrared-radio correlation (IRRC) of spheroid- and disc-dominated galaxies in the COSMOS field out to z 1.5. With 1.4 GHz data and Herschel photometry I found that the redshift evolution reported in recent works is due to an increasing radio excess emission associated with spheroid-dominated galaxies, compared to disc-dominated ones, i.e. the ‘purest' star-forming systems in our sample. I theorize that the extra radio power in spheroid-dominated systems is due to low-level AGN activity, even though these sources were not identified by most commonly-used diagnostics as AGN hosts. This finding will significantly increase the accuracy of future high-redshift radio surveys measuring star formation. In my third project I assembled and analysed the largest-to-date low-z IRRC sample of galaxies. I demonstrated the importance of selection effects influencing IRRC statistics, and carried out an improved IRRC analysis that yielded more accurate measures of the correlation's properties. With rich ancillary data it will provide insight into the physical processes that give rise to the IRRC. Finally, I adopted an MCMC-based model optimization to fit a radiative transfer model to ammonia line spectra of a binary molecular cloud core. I determined the physical structures and the masses of the cores and found they are gravitationally unbound.
3
Omma, Henrik Nilsen. "Jet-powered cooling cores : reversing cooling flows through AGN activity." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419330.
Full text
4
Laporte, Nicolas, Kimihiko Nakajima, Richard S. Ellis, et al. "A Spectroscopic Search for AGN Activity in the Reionization Era." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626417.
Full textAbstract:
The ubiquity of Lyman alpha (Ly alpha) emission in a sample of four bright [O III]- strong star-forming galaxies with redshifts above seven has led to the suggestion that such luminous sources represent a distinct population compared with their fainter, more numerous counterparts. The presence of Lya emission within the reionization era could indicate that these sources created early ionized bubbles due to their unusually strong radiation, possibly because of the presence of active galactic nuclei. To test this hypothesis, we secured long integration spectra with XSHOOTER on the VLT for three z similar or equal to 7 sources selected to have similar luminosities and prominent excess fluxes in the IRAC 3.6 or 4.5 mu m band, usually attributed to strong [O III] emission. We secured additional spectroscopy for one of these galaxies at z = 7.15 using MOSFIRE at the Keck telescope. For the most well-studied source in our sample with the strongest IRAC excess, we detect significant nebular emission from He II and N V indicative of a non-thermal source. For the other two sources at z = 6.81 and z = 6.85, for which no previous optical/near-infrared spectroscopy was available, Ly alpha is seen in one and C III] emission in the other. Although based on a modest sample, our results further support the hypothesis that the phenomenon of intense [O III] emission is associated preferentially with sources lying in early ionized bubbles. However, even though one of our sources at z = 7.15 suggests the presence of non-thermal radiation, such ionized bubbles may not uniquely arise in this manner. We discuss the unique advantages of extending such challenging diagnostic studies with JWST.
5
Kolwa, Sthabile. "The effects of environment on radio-loud AGN activity in Stripe 82." University of the Western Cape, 2016. http://hdl.handle.net/11394/5318.
Full textAbstract:
>Magister Scientiae - MSc<br>We investigate the link between environment and radiative accretion efficiency using a sample of 8946 radio-loud AGN detected at 1 − 2 GHz in the SDSS Stripe 82 region. We quantify their environments using the surface-density parameter, ƩN, which measures galaxy density based on distances to Nth nearest neighbours. Comparing Ʃ2 and Ʃ5 between AGN and control galaxies, we obtain relative densities that quantify the degree of galaxy clustering around each AGN. Using this, we examine the relation between density and the HERG-LERG dichotomy (accretion-modes) classified using a 1.4 GHz luminosity (L1.4GHz) threshold. Our results indicate that, in the low-redshift interval (0.1 < z < 0.2), LERGs occupy environments denser than the field. At intermediate redshifts (0.2 < z < 1.2), both LERGs and HERGs occupy regions denser than the field. Spearman’s rank tests show that correlations between density and L1.4GHz in both redshift intervals are weak. We conclude that the absence of a strong correlation is confirmation of the idea that galaxy density plays a more secondary role on AGN activity and also, accretion-mode classification (both measured using L1.4GHz). It is likely that the rate of gas accretion or properties of galactic-scale magnetic fields correlate more strongly with L1.4GHz, hence being primarily influential.<br>National Research Foundation (NRF)
6
Ma, Jingzhe, Anthony H. Gonzalez, J. D. Vieira, et al. "SPT0346-52: NEGLIGIBLE AGN ACTIVITY IN A COMPACT, HYPER-STARBURST GALAXY AT z = 5.7." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622449.
Full textAbstract:
We present Chandra ACIS-S and Australia Telescope Compact Array (ATCA) radio continuum observations of the strongly lensed dusty, star-forming galaxy SPT-S J034640-5204.9 (hereafter SPT0346-52) at z = 5.656. This galaxy has also been observed with ALMA, HST, Spitzer, Herschel, Atacama Pathfinder EXperiment, and the Very Large Telescope. Previous observations indicate that if the infrared (IR) emission is driven by star formation, then the inferred lensing-corrected star formation rate (SFR) (similar to 4500 M-circle dot yr(-1)) and SFR surface density Sigma(SFR) (similar to 2000 M-circle dot yr(-1) kpc(-2)) are both exceptionally high. It remained unclear from the previous data, however, whether a central active galactic nucleus (AGN) contributes appreciably to the IR luminosity. The Chandra upper limit shows that SPT0346-52 is consistent with being star formation dominated in the X-ray, and any AGN contribution to the IR emission is negligible. The ATCA radio continuum upper limits are also consistent with the FIR-to-radio correlation for star-forming galaxies with no indication of an additional AGN contribution. The observed prodigious intrinsic IR luminosity of (3.6 +/- 0.3) x 10(13) L-circle dot originates almost solely from vigorous star formation activity. With an intrinsic source size of 0.61 +/- 0.03 kpc, SPT0346-52 is confirmed to have one of the highest Sigma(SFR) of any known galaxy. This high Sigma(SFR), which approaches the Eddington limit for a radiation pressure supported starburst, may be explained by a combination of very high star formation efficiency and gas fraction.
7
Noirot, Gaël. "The CARLA-Hubble survey : spectroscopic confirmation and galaxy stellar activity of rich structures at 1.4 < z < 2.8." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC153.
Full textAbstract:
Les études détaillées d'amas de galaxies confirmés à grands redshifts sont peu nombreuses. L’objectif de cette Thèse est d’établir le premier catalogue d'amas confirmés spectroscopiquement à grand redshift et, pour la première fois à ces redshifts, d’étudier de manière statistique les propriétés des galaxies membres des amas. Dans cette Thèse, nous caractérisons et étudions 20 candidats amas à redshifts 1.4 < z < 2.8 parmi les candidats les plus prometteurs de l’échantillon CARLA. Nous réduisons et analysons des données spectroscopiques grism sans fente et imagerie proche-infrarouge des amas candidats, obtenues avec le télescope spatial Hubble. Nous mesurons plus de 700 redshifts au sein des champs observés, et confirmons spectroscopiquement 16 amas CARLA dans l’intervalle 1.4 < z < 2.8; ces amas sont associés à des noyaux galactiques actifs à fortes émissions radios (RLAGN) en leur centre, par sélection. Cet effort fait plus que doubler le nombre d’amas confirmés à ces redshifts. Nous étudions également le taux de formation stellaire des galaxies membres des amas en fonction de leur masses stellaires, et de la distance aux RLAGN. Nous trouvons que les galaxies membres massives sont situées sous la séquence principale jusqu’à z=2, ce qui suggère déjà à ces redshifts une évolution accélérée des galaxies massives au sein des amas. Nous trouvons également une concentration plus importante de membres actifs à plus petits rayons des RLAGN, jusqu’à z=2. Ceci est en accord avec un renversement de la relation densité vs. taux de formation stellaire pour nos amas CARLA à 1.4 < z < 2.0, ce qui suggère que les amas CARLA représentent une phase de transition de l’évolution des galaxies au sein des amas. Nous étudions également les populations stellaires de deux de nos amas confirmés à redshift z=2.0. Nous analysons les relations couleurs-couleurs et couleurs-magnitudes de ces deux amas et montrons que l’une des structures à z=2 possède une séquence rouge de galaxies passives. Globalement, nos résultats démontrent que les amas CARLA représentent des structures riches comprenant des populations mixtes de galaxies évoluées et massives sans formation stellaire, et des galaxies actives formant des étoiles. Cet échantillon sans précédent de 16 amas confirmés spectroscopiquement dans l’intervalle de redshift 1.4 < z < 2.8 constitue un échantillon idéal pour étudier statistiquement la phase de transition des amas de galaxies, ainsi que les mécanismes de suppression de la formation stellaire. (Abrégé)<br>Detailed studies of high-redshift confirmed galaxy clusters are based on a few individual objects. In this Thesis, we therefore aim at building the first sample of spectroscopically confirmed clusters at high-redshifts and, for the first time at these redshifts, statistically infer cluster member galaxy properties. In this Thesis, we study and characterize 20 cluster candidates at redshifts 1.4 < z < 2.8, which represent the most promising cluster candidates from the CARLA sample. We reduce and analyze slitless grism spectroscopic and near-infrared imaging data of the fields, obtained with the Hubble Space Telescope. We measure redshifts for over 700 star-forming sources in the 20 fields, and we spectroscopically confirm 16 CARLA clusters in the range 1.4 < z < 2.8; by selection, these clusters are associated with powerful radio-loud active galactic nuclei (RLAGN) at their center. This effort alone more than doubles the number of confirmed clusters at these redshifts. We study cluster member star-formation rates (SFRs) as a function of their stellar masses and distances from the RLAGN. We find that massive members are located below their star-forming main-sequence up to z=2. This implies that the massive star-forming end of the cluster population already followed an accelerated evolution at these high redshifts. We also find an increasing concentration of star-forming members with smaller radii relative to the RLAGN, at all redshifts up to z=2. Our 1.4 < z < 2.0 cluster members are therefore consistent with a reversal of the SFR-density relation. This is a first evidence showing that CARLA clusters represent a transition phase for cluster galaxy evolution. We also study stellar populations of two of our confirmed CARLA clusters at z=2.0. We study their color-color and color-magnitude relations and show that one of the two structures is comprised of a z=2 red sequence of passive candidate members. Together, these results provide clear evidence that our confirmed CARLA clusters represent rich structures comprised of mixed populations, including both evolved, passive, massive galaxies, and galaxies with ongoing star formation. Together, this unprecedented sample of 16 confirmed clusters at 1.4 < z < 2.8 constitutes an ideal sample for further statistical investigation of the cluster transition phase, including study of quenching mechanisms. (Abridged)
8
Alberts, Stacey, Alexandra Pope, Mark Brodwin, et al. "STAR FORMATION AND AGN ACTIVITY IN GALAXY CLUSTERS FROM z = 1–2: A MULTI-WAVELENGTH ANALYSIS FEATURING HERSCHEL /PACS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621395.
Full textAbstract:
We present a detailed, multi-wavelength study of star formation (SF) and active galactic nucleus (AGN) activity in 11 near-infrared (IR) selected, spectroscopically confirmed massive (greater than or similar to 10(14)M(circle dot)) galaxy clusters at 1 < z < 1.75. Using new deep Herschel/PACS imaging, we characterize the optical to far-IR spectral energy distributions (SEDs) for IR-luminous cluster galaxies, finding that they can, on average, be well described by field galaxy templates. Identification and decomposition of AGNs through SED fittings allows us to include the contribution to cluster SF from AGN host galaxies. We quantify the star-forming fraction, dust-obscured SF rates (SFRs) and specific SFRs for cluster galaxies as a function of cluster-centric radius and redshift. In good agreement with previous studies, we find that SF in cluster galaxies at z greater than or similar to 1.4 is largely consistent with field galaxies at similar epochs, indicating an era before significant quenching in the cluster cores (r < 0.5 Mpc). This is followed by a transition to lower SF activity as environmental quenching dominates by z similar to 1. Enhanced SFRs are found in lower mass (10.1< logM(kappa)/M-circle dot < 10.8) cluster galaxies. We find significant variation in SF from cluster to cluster within our uniformly selected sample, indicating that caution should be taken when evaluating individual clusters. We examine AGNs in clusters from z = 0.5-2, finding an excess AGN fraction at z greater than or similar to 1, suggesting environmental triggering of AGNs during this epoch. We argue that our results-a transition from field-like to quenched SF, enhanced SF in lower mass galaxies in the cluster cores, and excess AGNs-are consistent with a co-evolution between SF and AGNs in clusters and an increased merger rate in massive halos at high redshift.
9
Zaheer, Farah. "Adaptations in motor unit activity with age and physical activity." Thesis, Boston University, 2012. https://hdl.handle.net/2144/12693.
Full textAbstract:
Thesis (Sc.D.)--Boston University
PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>The hypothesis that age-related alterations to the morphological properties of a motor unit (MU) are accompanied by modifications in their control properties has been supported by data that compared young (24-37 y.o.) and elderly (65-88 y.o.) adults (Erim et al. J. Neurophys., 1999). The objective of the present dissertation was to characterize whether such modifications in MU control properties are progressive across a continuum of ages from childhood to senescence, and whether such adaptations are muscle and usage dependent. Multiple concurrently active MUs were assayed from the first dorsal interosseous (FDI) and vastus lateralis (VL) muscles in healthy subjects from 8-86 years of age. Surface EMG (sEMG) signals were acquired while the participants isometrically tracked a trapezoidal force trajectory at 20%, 50% and 80% of their maximal voluntary force capacity. Data were decomposed into MU trains using a recently developed sEMG decomposition procedure (De Luca et al. J. Neurophys., 2006; Nawab et al. J Clin. Neurophys., 2010) that provides a much greater yield (typically 3- 6 X) than that of prev1ous needle sensor based technologies. Results from n=65 subjects (representing approximately 5307 analyzed MUs) indicate that the average firing rates of the earliest recruited MU trains were significantly reduced with increasing age (p<0.05)) for both muscles and the three normalized force levels tested. Characteristics of MU behavior in young children were reported for the first time, and demonstrated unique properties compared to findings in adults and the elderly. Additionally, those elderly adults who scored at the high end of a physical activity scale deviated least in their firing rate properties from young adults, demonstrating that habitual physical activity can modify the effects of ageing. These findings indicate an age and usage-dependency to MU control properties that is progressive.
10
Mata, Joe I. (Joe Israel). "The Effects of Age-Graded Associations on the Political Activism of the Elderly." Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc501086/.
Full textAbstract:
Although the graying of the American society has been well documented, the question as to whether the elderly populace will indeed become a political factor has yet to be determined. Some studies indicate that the elderly will soon develop the consensus needed for political action; other studies counter that the elderly will never be a viable political factor. Among the determinants listed as influencing the political participation equation are standard socioeconomic variables (e.g., race, social status, education, and income). These factors have been studied extensively (Campbell 1960; Key 1950; Milbrath 1965; Nagel 1987; Rose 1965). Trela recently added an item that could possibly influence the political activism of the elderly: membership in age-graded associations. This study addresses the questions raised by Trela (1971), namely, whether age-graded associations influence the political activity of senior citizens, and if so, in what direction elderly participation is swayed. Unlike previous reports, the preliminary data gathered for this study suggest that the age-graded associations of the elderly cannot accurately predict their political activism.
11
Nanni, Valentina <1984>. "Antimicrobial activity of peach and grapevine defensins." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4434/.
Full textAbstract:
Antimicrobial peptides (AMPs) are an important component of the innate immune system of the plants. Plant defensins are a large family of antimicrobial peptides with several interesting features, such as small dimension, high stability and broad spectrum of action. The discovery of new molecules and the study of their mechanism of action allow to consider them attractive for biotechnological applications.
In this PhD thesis a defensin from Prunus persica (PpDFN1) and four novel DEFensin Like (DEFL) peptides from Vitis vinifera have been studied. In order to characterize the antimicrobial activity of these molecules, the recombinant mature peptides have been expressed in Escherichia coli and purified to homogeneity by chromatography techniques.
PpDFN1 is able to inhibit the growth of B. cinerea, P. expansum and M. laxa with different intensity. The recombinant peptide is capable of membrane permeabilization as demonstrated by SYTOX green fluorescence uptake in treated mycelia. Its interaction with membranes containing sphingolipid species has been shown by artificial lipid monolayers. Furthermore, PpDFN1 displays stronger interaction with monolayers composed by lipids extracted from sensitive fungi with the highest interaction against P. expansum, the most sensitive fungi to PpDFN1 action.
DEFL 13, a defensin from grapevine, resulted the strongest antibotrytis peptides. It is electrostatically attracted to the fungal membranes as shown by the antagonist effect of the cations and is able to membrane permeabilization in B. cinerea hyphae. DEFL 13 is internalized in fungal cells and leads to fungal death by activation of some signaling pathways as demonstrated by screening of a mutant collection of B. cinerea
12
Johnson, Lori Ann. "The role of activity level for memory in the elderly." CSUSB ScholarWorks, 1997. https://scholarworks.lib.csusb.edu/etd-project/1554.
Full text
13
Meyer, Helen M. "AGE OF MENARCHE, INITIAL SEXUAL ACTIVITY AND FAMILY COMPOSITION." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin960907404.
Full text
14
Goff, Elizabeth A. "The effect of age on cardiovascular activity during sleep." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501414.
Full text
15
DHAINAUT, FRANCOISE. "Activite physique et sportive et sujet age." Lille 2, 1990. http://www.theses.fr/1990LIL2M122.
Full text
16
BLANC, JOUD NADINE. "Sante, sport et troisieme age." Aix-Marseille 2, 1989. http://www.theses.fr/1989AIX20299.
Full text
17
Randel, Patricia A. "Physical activity around the age of 40 and postmenopausal osteoporosis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0015/MQ49428.pdf.
Full text
18
Crichton, Angus Julian Dewar. "Popular attitudes to judical activity in the age of Aristophanes." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285155.
Full text
19
Bell, L. Andrew. "Age Dependent Spatial Characteristics of Epileptiform Activity in Malformed Cortex." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2614.
Full textAbstract:
Developmental cortical malformations are a major cause of intractable seizures. Determining the location and timing of susceptibility for epileptiform activity is critical to identifying what mechanisms contribute to epileptogenesis in any model. Using the freeze lesion rat model of polymicrogyria, we have identified, in lesioned cortex, these two aspects of epileptogenesis. Previous studies have demonstrated that epileptiform activity cannot be evoked prior to postnatal day (P) 12, but the malformed cortex is more susceptible to seizures as early as P10. An increase in excitatory afferents to the epileptogenic zone occurs before the onset of network epileptiform activity. Whether or not these afferents are a major contributor to the hyperexcitability of the malformed cortex can be investigated by determining if they specifically create a susceptibility for epileptiform activity. We have examined that here by measuring whether that timing coincides with an increased susceptibility for evoked and spontaneous epileptiform activity. We report that the malformed cortex is more susceptible to evoked epileptiform activity than control cortex as earlier as P7 and as late as P36. Further, we also find that the form of spontaneous epileptiform activity in malformed cortex is altered as early as P7. The timing of these early disruptions of cortical function found here suggests additional epileptogenic mechanisms exist prior to the reported increase in excitatory afferents at P10. Determining the location of the seizure initiation is an essential part of epilepsy research. Some patients with developmental cortical malformations have seizures initiated within the malformation, while others have seizures generated by the surrounding cortex. Previous data in the freeze lesion model of microgyria suggests that the timing of freeze lesion (from P0 to P1) can shift the epileptogenic focus from the malformation to the paramicrogyrial region (PMR). We report that both the timing of the freeze lesion and the survival age of the animal can alter the epileptogenic circuitry of the malformation and surrounding tissue. These findings provide new insight to the timeline of hyperexcitability in malformed cortex and will possibly lead to greater surgical success for patients with intractable epilepsy.
20
Loichinger, Elke, and Alexia Prskawetz. "Changes in economic activity: The role of age and education." Max Planck Institute for Demographic Research, 2017. http://dx.doi.org/10.4054/DemRes.2017.36.40.
Full textAbstract:
Background: Between 2000 and 2010, the labor force participation (LFP) of European men stayed mostly constant, whereas the participation of women continued to increase. Participation rates of people close to normal retirement ages rose almost universally. At the same time, the education composition shifted toward higher levels of educational attainment and education-specific differentials in economic activity persisted.
Objective: The aim of the paper is to understand the extent to which developments of LFP rates between 2000 and 2010 in selected European countries can be explained by age-specific and education-specific changes in participation rates, as compared to changes in populations' structural composition by age and education.
Methods: We apply a decomposition methodology that allows us to disentangle changes in age- and education-specific LFP rates from changes in the age and educational structure of the population.
Results: Our results show that LFP rates of adult women would have increased even more, had it not been for the downward pressure from the shift in the age composition toward older age groups with relatively lower levels of participation. This downward pressure also depressed male participation. The increase in participation among older people is mainly explained by participation increases among those with nontertiary education and is reinforced by a general shift toward higher levels of educational attainment.
Contribution: Beyond changes in the age structure, we quantify the role of compositional changes by educational attainment. Our results indicate that labor supply may not decrease to the extent expected due to population aging, given educational expansion and education-specific patterns of economic activity.
21
Rudberg, Andrea, and Linnéa Granström. "Associations between gestational age, physical activity and cognitive functioning among children in early school age." Thesis, Umeå universitet, Institutionen för psykologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-121874.
Full textAbstract:
The aim of this study was to examine differences and associations concerning physical activity and cognitive functioning among children born preterm in comparison to those born full term. The sample consisted of 130 children at early school age (mean = 7.8 years), born at a gestational age (GA) of 23 - 42 weeks, and categorized into three groups; children born full term (GA 39 - 42), moderately preterm (GA 34 – 36) and very preterm (GA 23 - 33). Physical activities were perceived from parents’ ratings by use of the Child behaviour checklist (CBCL), and cognitive functioning by WISC-IV. Results showed that children born moderately preterm performed comparable to children born full term, both regarding physical activity ratings and cognitive performance. Children born very preterm were found to have significantly poorer full scale IQ, lower physical performance, fewer sport activities, and were less lateralized, in comparison to both children born full term and those born moderately preterm. Conclusion: a very preterm birth seems to generate long-term effects on physical activities, sport performance and cognitive functioning. Thus, more focus should be paid to children born at a very low GA to identify early deviations and to provide interventions to improve cognitive functioning and enhance physical performance; also in contexts other than sport activities.<br>Syftet med denna studie var att undersöka skillnader och samband mellan fysisk aktivitet och kognitivt fungerande inom gruppen för tidigt födda barn och i jämförelse med fullgångna barn. Urvalet bestod av 130 barn i tidig skolålder (medel = 7.8 år), födda i gestationsålder (GA) mellan 23 – 42 veckor kategoriserade i tre grupper; fullgångna barn (GA 39 – 42), moderat förtidigt födda (GA 34 – 36) och mycket förtidigt födda (GA 23 – 33). Fysisk aktivitet undersöktes utifrån föräldrars skattning genom användande av Child behaviour checklist (CBCL) och kognitivt fungerande utifrån WISC-IV. Resultaten visade att de moderat för tidigt födda barnen presterade jämförbart med de fullgångna barnen både vad beträffar fysisk aktivitet och kognitivt fungerande. De mycket för tidigt födda barnen visade sig ha signifikant sämre fullskale-IQ, lägre sportsliga prestationer, färre antal sporter och var mindre lateraliserade, jämfört med både de fullgångna barnen och de moderat förtidigt födda. Slutsats: en mycket förtidig födsel tycks generera långvariga effekter på fysiska aktiviteter, sportsliga prestationer och kognitivt fungerande. Således bör större fokus läggas på barn födda med en mycket låg GA för att identifiera tidiga avvikelser och tillhandahålla interventioner för att förbättra kognitivt fungerande och stimulera/förhöja fysiska prestationer; även i andra kontexter än sportsliga aktiviteter.
22
Roberts, Christine. "Analysis of different types of physical activity and functional independence in old age." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=237638.
Full textAbstract:
Physical activity is associated with greater independence in old age. While most research has focused on the frequency, intensity and time spent in activity, inconsistent findings have emerged, possibly due to differences across different types of physical activity. Physical activities differ in terms of their non-metabolic, mental, physical and social demands, however, to date, the effects of these demands on functional independence are unexplored. The present thesis aimed to investigate the effect of different types of physical activity on functional independence in old age. A systematic review of randomised controlled trials (RCTs) found a significant, beneficial effect of physical activity on functional performance, with the largest effects found for moderate physical activity levels, and activity types with high levels of mental (e.g. memory, attention), physical (e.g. coordination, balance) and social (e.g. social interaction) demands. These findings generated the hypothesis that physical activities high in mental, physical and social demands are associated with greater functional independence. Thus, a novel typology of physical activities was generated by systematically coding the mental (i.e. attention/concentration, memory, decision-making and strategy), physical (i.e. flexibility, balance, coordination, speeded reactions) and social (i.e. social interaction) demands of 59 physical activities. The typology was then used to recode data from the Understanding Society survey. Findings revealed that as the non-metabolic, physical activity demands increased, functional independence improved. Associations remained significant after controlling for demographics. Key findings included differences across gender, in that the mental and physical demands of activity predicted muscular strength in males, whereas social demands predicted muscular strength in females. In conclusion, physical activities with higher mental, physical and social demands (e.g. dancing) are associated with greater functional independence in old age, compared with simpler types (e.g. walking). Future research is required to test whether these novel findings are replicated elsewhere, ideally using longitudinal or RCT designs.
23
Roussel, Pascale. "Activite physique et statut cognitif du sujet age." Lille 2, 1992. http://www.theses.fr/1992LIL2M304.
Full text
24
GARANX, ALAIN. "Modifications biologiques induites par l'activite physique chez le sujet age." Lille 2, 1990. http://www.theses.fr/1990LIL2M337.
Full text
25
HANNON, LUDOVIC, and BERTRAND DEMORY. "Le dosage de l'osteocalcine dans une population de 129 sujets temoins, etude des correlations avec le bilan phosphocalcique et l'activite physique." Lille 2, 1988. http://www.theses.fr/1988LIL2M113.
Full text
26
Parry, Stephen Finlay. "Age and underlying cause of hot-spring activity at Rhynie, Aberdeenshire, Scotland." Thesis, University of Aberdeen, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420109.
Full textAbstract:
Rhynie ranks as the oldest known example of a subaerial hot-spring system. A new, robust radiometric age for the Rhynie Chert is herein presented, and a genetic model for the Rhynie hydrothermal system and its concomitant mineralization established. Consideration is also given to the Rhynie Outlier in the context of the Siluro-Devonian evolution of Scotland. The Milton of North (basaltic) andesite, a lava flow tentatively assigned to the Tillybrachty Sandstone Formation (i.e. lying stratigraphically beneath the Rhynie cherts), has yielded an ID-TIMS U-Pb zircon-titanite age of 409-6 ± 1.1 ma (2σ). This high-precision age is shown to date <i>within error </i>the Rhynie Cherts Unit (Dryden Flags and Shales Formation), and hence hot-spring activity at Rhynie. A published <sup>40</sup>Ar- <sup>39</sup>Ar isochron age of 396 ± 12 Ma does not represent the true age of the Rhynie Chert, as once believed. Given the sound palynological control on the age of the Dryden Flags and Shales Formation, the Rhynie Chert-bearing succession now assumes ‘stratigraphic tie-point’ status. Integration of the new absolute age for Rhynie with the (ID-TIMS) U-Pb K-bentonite age dataset of Tucker <i>et al. </i>(1998) tightly constrains the age of the Pragian-Emsian boundary at <i>c</i>. 409 Ma. Intermediate-to-acidic minor intrusions exposed in the Rhynie area belong to one of two temporal groups viz, <i>c</i>. 470 Ma (pegmatites and microgranites) and 425-430 Ma (porphyries and felsites). Although variably carrying all components of the Rhynie metal/metalloid assemblage, and in many cases having undoubtedly released a metal/metalloid-bearing fluid, these igneous bodies were clearly not directly involved in the Rhyme hot-spring activity/mineralization. Similarly, the ‘Cairngorm Suite’ plutons of NE Scotland, based upon a <i>provisional </i>U-Pb monazite age of 427.5 Ma for the Coilacriech Granite and unpublished data concerning the Lochnagar Complex, can have played no direct role in <i>c</i>. 410 Ma hydrothermal activity. the Rhynie hot-spring system must, therefore, have been driven by a subsurface manifestation of that volcanic event recorded in the Rhynie Outlier. It is suggested that the system-powering basaltic andesite magma represented a heavily contaminated upper mantle-derived partial melt, whose petrogenesis and ascent were inherently linked to the (dextral) transcurrent fault movement(s) responsible for the formation of the Rhynie basin. This magma ponded beneath the developing Rhynie basin in a dilatational void created at the intersection of the basin-governing strike-slip fault and the (syn-Grampian) shear zone which forms the northern margin of the ‘Younger basic’ Boganclogh Mass. In addition to heat, the sub-basinal basaltic andesite magma body supplied, by means of an exsolved fluid, Au and As to the Rhynie hydrothermal system. Mo and W were, by contrast, scavenged from ‘Younger basic’ syenitic fractionates and texturally-variable biotite microgranites (<i>c.</i> 470 Ma) occurring in the Rhynie Outlier basement. The atypical geochemical signature of the andesite-driven Rhynie system is a fortuitous consequence of the system’s location.
27
Johnson, Sherèè Johnson. "Income, Education, Age, and Physical Activity Among Physically Disabled African American Women." ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/4298.
Full textAbstract:
This study was designed to identify possible risk factors about physical activity in middle-aged disabled African American women (AAW) aged 45 to 64 years. Disabled middle-aged AAW has a disproportionate prevalence of obesity and chronic illness than nondisabled women. Most disabled middle-aged AAW leads a sedentary lifestyle, and they do not meet the recommended physical activity (PA) guidelines. Little is known about this group, and a social ecological model was used to explain PA patterns. Data were extracted from the 2009 Behavioral Risk Factor Surveillance System (N = 1,599) for women who responded yes to indicate that they needed specialized equipment. This cross-sectional quantitative study used univariate and multivariate analysis to assess the relationship between age, education, and income among middle-aged disabled AAW. A general linear model revealed younger disabled AAW (ages 45 to 54) engaged in more physical activity time per week than did their older counterparts (estimate = 76.012, p = .001). Individuals with less education reported more minutes of physical activity than college graduates (estimate = 142.522, p = .001). Respondents with annual incomes from $35,000-$49,999 (estimate = 184.590, p = .000) were more physically active than their more affluent counterparts. Smoking, demographic variables, and emotional well-being did not affect minutes of moderate physical activity. This research may contribute to positive social change by suggesting that programs intended to increase physical activity among disabled AAW be targeted toward those who are older, are more educated, and have higher incomes.
28
Cheung, Hang, and 張恆. "Association of physical activity and cognitive function among Chinese older adults." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B4325097X.
Full text
29
Degros, Éric B. "Activites physiques du sujet age et systeme nerveux central." Lille 2, 1991. http://www.theses.fr/1991LIL2M060.
Full text
30
Snyman, Lourien. "Physical activity and homocysteine in Tswana adolescents : the play : study / L. Snyman." Thesis, North-West University, 2008. http://hdl.handle.net/10394/4319.
Full text
31
Coldwells, Adam. "Effects of age and physical activity on the entrainment of human circadian rhythms following a phase shift." Thesis, Liverpool John Moores University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321360.
Full text
32
Chen, Yu-Ling. "Correlates of sedentary behaviour in mid-age and older adults." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21658.
Full textAbstract:
Sedentary behaviour (SB) is prevalent across all ages, but particularly in older adults aged 50 years and above. Given that older adults spend more than 60% of waking hours sedentary, enhancing our understanding of the correlates of SB will be important to inform the development of interventions to reduce SB in mid-age and older adults. This thesis provides five studies focusing on the correlates of SB in mid-age and older adults. Firstly, Chapter 2 presents a literature review using behaviour epidemiology framework to examine the existing evidence on sedentary behaviour in general adults in order to identify the gap of current knowledge in sedentary behaviour. Chapter 3 presents a systematic review which included the existing evidence on correlates of SB in mid-age and older adults and provides evidence-based conclusions on the topic. Chapter 4 presents a study examining the association of demographics and physical activity (PA) with daily sitting time in mid-age and older adults, and found behavioural correlates of SB and PA in mid-age and older adults. Chapter 5 presents a secondary data analysis using the data of the older office worker from the Stormont study. This chapter uses the results from the cross-sectional and longitudinal data to examine the association of demographics and behaviours with domain-specific sitting time among the older office workers. In this study, differences were found in demographic and behavioural correlates according to the studied domain of sitting. Chapter 6 presents a 6-month longitudinal study, which was designed to fill the gaps of our understanding of the associations between demographics, health and PA with SB in older adults aged 65 years and above. This chapter also looked into the changes of sitting time and its correlates. Together, these four studies provide adequate evidence on the demographics and behavioural correlates of SB and also identified the determinants of SB in mid-age and older adults. This thesis found that demographics had limited associations with SB, and sociodemographics were associated with work-related sitting time. Health behaviour was generally inversely associated with SB. These findings provide information to the correlates and determinants of mid-age and older adults SB and will inform further research on behaviour change strategies.
33
Ding, Li. "Synthèse de molécules hybrides cytotoxiques métalloporphyrine-intercalant et étude de leur activité nucléase." Toulouse 3, 1990. http://www.theses.fr/1990TOU30016.
Full textAbstract:
Les travaux exposes dans ce memoire sont relatifs a une modelisation de la bleomycine, medicament antitumoral, capable de degrader l'adn par oxydation selon un mecanisme similaire a celui des monooxygenases (cytochrome p-450). La faible activite cytotoxique et nuclease in vitro des molecules hybrides metalloporphyrine hydrophobe-ellipticine montre l'interet de la synthese de metalloporphyrines ayant une forte affinite pour les acides nucleiques. Ainsi, la synthese de nouvelles metalloporphyrines cationiques fonctionnalisees hydrosolubles cytotoxiques ayant une forte affinite pour l'adn et une forte activite nuclease a ete mise au point. Une serie de nouvelles molecules hybrides metalloporphyrine cationique-ellipticine avec des longueurs variables de bras liant les deux entites a ete preparee. Ces molecules sont cytotoxiques in vitro vis-a-vis des cellules tumorales l1210 et ont une forte activite nuclease in vitro sur l'adn superenroule. En conclusion, cette etude a permis d'obtenir de nouvelles metalloporphyrines cationiques fonctionnalisees cytotoxiques ayant une forte activite nuclease et permet donc de developper de nouvelles endonucleases artificielles. De plus, liees a un intercalant tel que la 9-methoxyellipticine, les molecules hybrides ainsi obtenues peuvent etre considerees comme des modeles efficaces de la bleomycine
34
Kartum, Kristin Fiskvik. "Effect of physical activity on gestational age and preterm birth: The HUNT study." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bevegelsesvitenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14692.
Full textAbstract:
Background The level of physical activity (PA) in the general population is considered too low, and this has also been shown for pregnant women. Although recent research has shown that regular moderate PA may be beneficial both for the mother and the fetus in relation to complications during pregnancy, the effect of being physically active before and during pregnancy is still debated. Objectives The aim of this study is to examine the effect of PA before and during pregnancy in relation to mean gestational age and risk of preterm birth in a large cohort of women. Subjects The study included a total of 2,515 women in HUNT 1 and 2,921 women in HUNT 2 aged between 20 and 35 years at the time of participation, and who had given birth during the following 5 years after the HUNT study. Methods Gestational age obtained from The Medical Birth Registry of Norway. In HUNT 1, PA was reported as frequency, intensity and duration, and in HUNT 2, hours of light and hard PA per week was reported. For both studies a summary score combining information from the separate items was constructed, classifying participants into the following groups: No, light, medium, or high activity. Using linear regression to calculate adjusted mean differences in gestational length between the activity groups, and logistic regression to calculate adjusted odds ratios (ORs) as estimates of relative risk of preterm birth (gestational age <37 weeks). A 95% confidence interval (CI) was calculated to indicate the precision of the estimated associations. Results PA before pregnancy was not related to mean gestational age, whereas for PA reported during pregnancy; inactive women had a non-significant 5.9 days (95% CI 2.2-13.9) shorter gestational length than active women. A similar pattern was evident for the risk of preterm birth; PA before pregnancy did not affect the risk of preterm birth. For PA during pregnancy there was a tendency that women who reported any level of activity had a lower risk of preterm birth compared with inactive women. The adjusted OR for women with low PA level was 0.26 (95% CI, 0.05-1.35), for those with medium PA level 0.46 (95% CI, 0.10-2.13), and for those with high PA 0.29 (95% CI, 0.04-2.05), all compared to the inactive. Conclusion PA before pregnancy does not seem to affect either mean gestational age or the risk of preterm birth, whereas there were some evidence that being physically active during pregnancy, at a level above inactivity, may reduce the risk of preterm birth. Keyword Physical activity • preterm birth • gestational age • pregnancy
35
Bradbury, Elizabeth. "The effects of aerobic activity on psychological mood states in college-age females /." Connect to online version, 1989. http://minds.wisconsin.edu/handle/1793/38888.
Full text
36
Rasmussen, Diane. "Nutrition, physical activity and health assessment of school age children in Menomonie, Wisconsin." Menomonie, WI : University of Wisconsin--Stout, 2007. http://www.uwstout.edu/lib/thesis/2007/2007rasmussend.pdf.
Full text
37
Campbell, Heather Diane, and n/a. "MOTIVES OF MATURE-AGE INDIVIDUALS FOR PARTICIPATING IN COMPETITIVE SPORTS: A CASE STUDY FOR MASTERS SQUASH." University of Canberra. Sports Studies, 2009. http://erl.canberra.edu.au./public/adt-AUC20091222.155411.
Full textAbstract:
The purpose of this study was threefold. Primarily it was to identify the underlying motivational influences determining why mature age men and women continue playing sport competitively, long after they have reached their peak performance level. Secondly, the study sought to ascertain whether there was a change in specific temperament attributes, such as competitiveness, as Squash players became older, and whether any changes were restricted primarily to the sporting environment, or did changes pervade other areas ofthe individuals' lives. The third purpose of the study was to design a new measurement instrument for use in effectively identifying the primary motivations of mature age squash participants within Australia.
The research study comprised a multi-system methodology which allowed for triangulation analysis of results. It involved both quantitative and qualitative methodological approaches, with four phases of investigation. The first phase focused on the development of a new motivation measurement instrument, titled Masters Sport Motivation Inventory (MSMI). The second phase involved a Pilot study aimed at implementing the MSMI instrument and evaluating it for validity and reliability, and sampled mature-age participants from nine different sports. The outcomes ofthe Pilot study demonstratedvalidityandreliability ofthe MSMI instrument. The third phase ofthe research comprised the main area ofinvestigation, which was to examine the motivations of Masters squash players in Australia. It used the MSMI instrument to obtain relevant data concerning the motivation of this cohort of sports competitors.The fourth phase comprised in-depth personal interviews from Australian Masters squash players. Interviewees had the opportunity to provide a greater insight into the importance of continued sporting participation into their older adult years. The MSMI data for both the Pilot and Main studies was analysed with the SPSS 15 analysis program. It was determined that there were 12 logical and interpretable motivational factors that were relevant to mature-age sports people and Australian Masters squash players. The results of the quantitative approach generally concurred with the outcomes derived from previous research which has examined the motivations of mature-age athletes, which found that health, enjoyment, fitness and competitiveness were highly relevant motives. In addition, this study extended the
outcomes to include other motives viewed as being important to older athletes' sporting aspirations, such as self-awareness, team, aesthetics, skill, stress, recognition, social, and travel,
The interview information was examined in two ways. Firstly, it was examined manually by the researcher. The material obtained during the interview process was classified according to groups of responses with similarities in contextual meaning, and the descriptive response data were calculated in the form ofmanual frequencies and percentages. Winning was the primary motive/outcome. Interview responses were also examined via an analysis program called Leximancer, and results revealed that differences in responses among mature-age squash players based on gender, age-class and ability level were minimal. Interview results indicated that many Masters squash players in Australia were still highly competitive, still very determined to win their matches, and still very focused on their goals and game plans.
The motives derived from the Masters squash players involved in the qualitative approach generally concurred with the outcomes derived from the quantitative approach, thereby adding consistency and outcome strength to the overall research. The opportunity for mature-age squash participants to elaborate on their feelings, sporting goals and motivations to continue playing their chosen sport enabled a greater depth and wealth ofrelevant information to be examined, and revealed a change in motivational emphasis from health and fitness issues to competitive and win-related issues. The results ofthis research as a whole, in relation to the outcomes obtained from the MSMI instrument, as well as from the personal interviews, differs somewhat from the philosophy of Masters sport, whereby it is assumed and promoted that older athletes primarily participate for fun, enjoyment and social opportunities. The results obtained in this research do not necessarily support this view. Many Australian Masters squash players play to win, and they give their all in an effort to achieve this goal and to reap the pleasure of recognition and rewards for doing so.
38
Thomas, Caitlyn Alyse. "Associations Among Age, Physical Activity, Insulin Sensitivity, Resistin, Endothelin-1, Adiponectin, and IGF-1 Levels." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1532976274272611.
Full text
39
劉肇妍 and Siu-in Lau. "Evidence-based guideline for increasing physical activity among Chinese older adults with depressive symptoms." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/193071.
Full textAbstract:
Depression has become a medical condition that affects more and more of the aged Hong Kong population, yet this condition is often overlooked. Depression is a treatable condition. Nevertheless, the current practice in Hong Kong relies heavily on medication and cognitive-behavioural therapy. The effectiveness of these two types of therapy is limited by the side-effects of the medications and the accessibility to medical facilities for cognitive-behavioural therapy.
Physical activity is suggested by many studies to be effective in managing depressive symptoms in the population. Physical exercise is a relatively economic and convenient activity that can be self-administered for health. Some studies have suggested that physical activity is effective for managing depression, yet the number of theses on this topic for the aged population is limited.
In this thesis, studies related to the effectiveness of physical activity on depressive symptoms alleviation among older adults were reviewed and critically appraised. The potential to apply the findings of these studies to the aged Chinese population in Hong Kong is discussed and presented.
Studies were searched using the databases Pubmed and CINAHL, and a total of 15 relevant studies were found.
The 15 studies were analyzed and listed as tables of evidence and appraised with the SIGN checklist for their quality. The results of these studies and the quality of the papers were summarized.
Regarding the physical activity types examined in these studies, aerobic exercise involving controlled-breathing or deep-breathing (e.g. TaiChi) and activities to promote posture including flexibility and balance (e.g. Yoga) were found to be effective for alleviating depressive symptoms among the aged population.
The feasibility and transferability of the desired intervention to the target population and setting were discussed. An evidence-based guideline with 8 recommendations was also developed.
Finally, a plan for communication with different parties (e.g., administrators, users and staff) to administer the intervention was devised. A pilot test was also planned, with and evaluation plan for the pilot test to allow for adjustments to the intervention.
This thesis discussed an alternative to treatment of depressive symptoms among the aged population. With the practice of physical activity effective in managing depressive symptoms in this population, it gave rise to the possibility that to promote the innovation to all of this population.<br>published_or_final_version<br>Nursing Studies<br>Master<br>Master of Nursing
40
Mark, Erin M. "Cognitive Activity and Intelligence: Implications for the Cognitive Reserve Model." Ohio : Ohio University, 2007. http://www.ohiolink.edu/etd/view.cgi?ohiou1173277687.
Full text
41
Casefont-Ducancelle, Alexandra. "ADN polymérase du cytomégalovirus humain : activité enzymatique et sensibilité aux entiviraux." Paris 5, 2005. http://www.theses.fr/2005PA05N15S.
Full textAbstract:
Le foscarnet, utilisé pour traiter les infections sévères à cytomégalovirus, est un inhibiteur de l'ADN polymérase, codé par le gène UL54. Le but du travail était d'étudier le retentissement de mutations introduites dans UL54 sur l'activité de l'enzyme et la résistance au foscarnet. Une méthode originale, reposant sur la mesure de l'incorporation de nucléotides trisphosphates marqués à la digoxigénénine dans le brin d'ADN en formation, a été mise au point pour mesurer l'activité d'ADN polymérases sauvages et mutées, et leur comportement en présence de foscarnet. L 'implication de l'extrémité N-terminale du domaine conservé delta-C dans le mode d'action du foscarnet a été démontrée pour la première fois. Le rôle d'association de mutations a été confirmé. L'étude des phénotypes de polymérases portant des mutations dans le domaine IV a permis de préciser leur rôle dans la fonction exonucléasique de l'enzyme virale<br>Anti-cytomegalovirus drug foscarnet, is an inhibitor of viral DNA polymerase pUL54. We aimed to analyse the impact of UL54 mutations on polymerase activity and foscarnet resistance. Mutations were introduced by mutagenesis into gene UL54 and wild-type and mutated DNA polymerases were expressed in vitro. We developed a colorimetric assay to measure DNA polymerase activity in the absence and presence of foscarnet. We demonstrated the usefulness of this DNA polymerase phenotypic assay for the characterization of mutation suspected to confer foscarnet resistance. Change N495K and combination of S291P and combination and K415R were shown to induce foscarnet resistance for the first time, confirming the wide distribution of foscarnet-resistance mutations through gene UL54. The role of N495K was confirmed by rescue marker. We assessed the major role of serine 771 on polymerase catalytic function and of amino-acids 412 and 413 on 3'5' exonuclease activity
42
Delic, Jozo. "Rôle structural et fonctionnel de séquences courtes d'ADN dans l'expression génétique : rôle des interactions intranucléaires dans le comportement dynamique de l'ADN." Paris 5, 1990. http://www.theses.fr/1990PA05P616.
Full text
43
Benson, Tera L. Lensegrav. "Effects of Physical Activity and Religiosity on Psychophysiological Reactivity in an Aging Population." DigitalCommons@USU, 2002. https://digitalcommons.usu.edu/etd/6173.
Full textAbstract:
Physical activity is known to offer health benefits. Additionally, research has linked religious involvement with health. Psychophysiological reactivity has links to coronary heart disease. This study examines the relationship between physical activity and religiosity in light of psychophysiological reactivity. The sample included 75 subjects, with a mean age of 71. 7 (SD = 6.11 ), with no history of cardiac incident. Religiosity was measured with the Religious Orientation Scale (ROS). Physical activity was assessed utilizing the Typical Week Physical Activity Scale. Psychophysiological reactivity was measured by blood pressure, heart rate, and self-report anger ratings in response to interpersonal challenge. Regression predicting reactivity, including ROS, total metabolic equivalence (MET) minutes, and interaction of the two resulted in significant prediction of systolic blood pressure change, F (3, 74) = 3.33, p = .024. Analyses suggest relationships between reactivity and religiosity are not mediated by physical activity. Indicating ROS may operate more influentially over prohibited than proactive behaviors.
44
Foster, Michael J. "The physical activity levels of college age sorority members compared to non-sorority members /." View online, 2008. http://repository.eiu.edu/theses/docs/32211131458633.pdf.
Full text
45
Wakazono, Tomotaka. "RECURRENCE OF CHOROIDAL NEOVASCULARIZATION LESION ACTIVITY AFTER AFLIBERCEPT TREATMENT FOR AGE-RELATED MACULAR DEGENERATION." Kyoto University, 2018. http://hdl.handle.net/2433/232093.
Full text
46
Elliott, Anne. "A multi-method investigation into physical activity in middle-age through a lifecourse perspective." Thesis, Middlesex University, 2017. http://eprints.mdx.ac.uk/22163/.
Full textAbstract:
This thesis began with practitioner observations in a specialist personal training practice, where anecdotal themes were noted from middle-aged clients (45-65 years old). Sedentary, exercise-averse individuals reported poor experiences of physical education in secondary school, whereas active clients gave a different narrative. These themes suggested differing life course trajectories that could result in ‘corporeal dissociation’ (CD), a term, defined here to describe a state of physical detachment that might result in adult inactivity. ‘Lives lived’ were investigated through a lifecourse theoretical perspective, within a pragmatic paradigm. Methodological Bricolage employed both qualitative and quantitative multi-methods to look at the research questions from differing perspectives. In Study 1, 10 practitioners were interviewed qualitatively to see if the original observations were replicated in other practices within the same geographical area. Data was analysed using content and emergent thematic analysis and it was found to be so. In Study 2, 800 middle-aged men and women across England completed a quantitative online survey that covered 63 experiences, grouped thematically, between the ages of 11-16: ‘home’, ‘about me’, ‘school’, ‘friends and leisure activities’. Data was statistically analysed using Principal Component Analysis followed by ANOVA and 16 significant dispositions and experiences centred around PE emerged as signifiers of corporeal dissociation in middle age. Study 3 took a sample of 8 men and 8 women from Study 2. It used narrative inquiry and established lifecourse themes of activity and inactivity that link adolescence and middle-age, with the individual’s relationship with their PE teacher being the biggest signifier and influence on later physical activity. Results show that corporeal dissociation can be found in practice and its origins in PE experience identified. Tentative life path signifiers have been determined and have been mapped between school and middle age. The outcome of the study is an understanding and definition of corporeal dissociation and a scalable tool for the practitioner to identify corporeal dissociation in new clients to help aid initial exercise adherence by prescribing suitable exercise programming.
47
Teran, Angie. "AGE-DEPENDENT EFFECTS OF EEDQ ON COCAINE-INDUCED LOCOMOTOR ACTIVITY AND D2 RECEPTOR SUPERSENSITIVITY." CSUSB ScholarWorks, 2019. https://scholarworks.lib.csusb.edu/etd/934.
Full textAbstract:
The neurochemical changes occurring between the preweanling period and adolescence could be crucial for understanding the role development plays in the manifestation of psychotic behaviors. N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline (EEDQ) fully attenuates the DA agonist-induced behaviors of adult rats, while potentiating the DA agonist-induced locomotor activity of preweanling rats. My specific hypotheses were as follows: (1) Systemically administered EEDQ would block the cocaine-induced locomotor activity of adult rats. (2) Systemically administered EEDQ would potentiate the cocaine-induced locomotion of preweanling rats. (3) EEDQ would increase the Emax values (a measure of D2 receptor sensitivity) of preweanling rats, but not adolescent or adult rats. And, (4) EEDQ would reduce dorsal striatal β-arrestin-2 (ARRB2) and GRK6 levels (measures of D2 receptor sensitivity) of preweanling rats. Behavioral results were as expected, because EEDQ attenuated the locomotion of adult and adolescent rats, while EEDQ potentiated locomotor activity of preweanling rats. EEDQ enhanced the GTPγS binding of preweanling rats, while depressing ARRB2 levels. These results are consistent with the overarching hypothesis that EEDQ causes DA supersensitivity in preweanling rats. Thus, it is here proposed that EEDQ inactivates a significant number of D2 receptors in preweanling rats, but that the remaining D2 receptors are supersensitive and capable of mediating a potentiated locomotor response.
48
Hsiao, Evana Tsunami. "Using message framing to promote regular physical activity in college-age women and men." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1261054537.
Full text
49
Edvardsson, Lotta, and Johanna Drejare. "Behavioural and emotional problems and physical activity in early school-age children born preterm." Thesis, Umeå universitet, Institutionen för psykologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-135431.
Full textAbstract:
The aim of this study was to investigate the associations and differences regarding behaviour- and emotional problems and physical activity (PA) in early school-age children born preterm in comparison to children born full term. The sample consisted of 131 children at age 6-9 (mean age 7.8, including 54 % girls). The participants were divided into four groups depending on weeks of gestational age (GA): extremely preterm (EPT; 22-27 weeks), very preterm (VPT; 28-33 weeks), moderate preterm (MPT; 34-37 weeks) and the control group born at full term (FT; 38-42 weeks). The data were received from parent’s ratings on the questionnaire Child Behaviour Checklist (CBCL). The result showed that children born EPT were rated as having significantly more symptoms of depression, ADHD and conduct disorders, compared to the children born VPT, MPT and FT. The children born EPT also participated more in individual sports rather than team sports and in particular for those children with high ratings on ADHD Scale and Oppositional Defiant Scale. In conclusion, children born EPT seem to have more symptoms on behavioural and emotional problems and therefore more attention is needed to define appropriate interventions for this group to prevent and treat these problems. Even though PA didn’t manifestly decrease with lower GA in this sample it’s likely that bigger differences will show when the children grow older and more investigations are needed to examine the impact of PA among children born PT.<br>Syftet med denna studie var att undersöka relationer mellan beteende och emotionella problem samt fysisk aktivitet i tidig skolålder hos prematura barn i jämförelse med fullgångna barn. Urvalet bestod av 131 barn i åldern 6–9 (medelvärde 7.8, inklusive 54 % flickor). Deltagarna blev indelade i fyra grupper beroende på gestationsålder: extremt prematura (22–27 veckor), mycket prematura (28–33 veckor), måttligt prematura (34–37 veckor) och kontrollgruppen som bestod av fullgångna barn (38–42 veckor). Datamaterialet inhämtades från föräldrarnas skattningar på enkäten Child Behaviour Checklist (CBCL). Resultaten visade att barn som fötts extremt prematurt skattades ha signifikant mer symtom av depression, ADHD och uppförandestörning jämfört med mycket och måttligt prematura samt fullgångna barn. Barnen som fötts extremt prematurt utövade även mer individuella idrotter och mindre lagidrotter, vilket var speciellt tydligt för barn med höga skattningar på skalorna ADHD och trotssyndrom. Sammanfattningsvis har barn födda extremt prematurt mer emotionella och beteendemässiga problem jämfört barn med längre gestationsålder, och utifrån det behövs mer fokus på att utforma lämpliga interventioner för att förebygga och behandla dessa problem. Även om fysisk aktivitet inte visade sig minska med lägre gestationsålder i vårt urval är det troligt att större skillnader kommer visa sig när barnen blir äldre och vidare undersökningar krävs för att avgöra hur fysisk aktivitet kan tänkas påverka utfallen för prematura barn.
50
Frau, Silvana. "Préparation et activité nucléase d'une molécule conjuguée "métalloporphyrine-Hoechst 33258" comme agent de reconnaissance du petit sillon de l'ADN." Toulouse 3, 1996. http://www.theses.fr/1996TOU30017.
Full textAbstract:
Ce memoire presente des travaux visant a modeliser la bleomycine, un antibiotique d'origine naturelle, capable de degrader l'adn par un mecanisme d'oxydation de type cytochrome p450. Nous avons prepare une molecule hybride metalloporphyrine-hoechst 33258 associant un agent de reconnaissance du petit sillon de l'adn (h33258) a une porphyrine cationique de manganese, catalyseur biomimetique d'oxydation connue pour son activite nuclease. Le premier chapitre est consacre a des rappels bibliographiques sur la nature des interactions de h33258 avec l'adn, generalement etudiee grace aux methodes physico-chimiques et biologiques courantes (gels d'empreintes, modelisation moleculaire, spectroscopies d'absorption et d'emission, spectroscopie de resonance, cristallographie). Dans un deuxieme chapitre, nous decrivons la synthese du compose metalloporphyrine-hoechst 33258 en plusieurs etapes: fonctionnalisation des deux synthons de depart, couplage pour former la molecule hybride, quaternarisation qui conduit a une structure polycationique a haute affinite pour l'adn, puis metallation de l'hybride. Plusieurs metaux ont ete inseres dans le cycle porphyrinique: le manganese pour ses proprietes redox, le nickel comme controle et le zinc pour d'eventuelles etudes de chimie luminescence. Enfin, dans un troisieme chapitre nous mettons en evidence les proprietes nucleases de la molecule metallee par le manganese, et, a partir des sites de coupures identifies, nous apprehendons et discutons ses differents modes d'interactions avec les acides nucleiques etudies. L'equilibre en solution du complexe ligand-adn est etudie par spectroscopie d'absorption afin d'estimer la constante d'affinite de cette molecule hybride pour des polymeres poly(da. Dt)