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Dissertations / Theses on the topic 'Search for planets'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Tsapras, Yiannis. "Microlensing search for extra solar planets." Thesis, University of St Andrews, 2002. http://hdl.handle.net/10023/7092.

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Gravitational microlensing may be used to probe distant stars for planetary companions. The presence of a planet in the vicinity of a star acting as the lens may cause a short lived anomaly in the observed lightcurve of the lensing event. By quantifying these anomalies we may place limits on the mass of the companion relative to the lens as well as the position of the planet relative to the primary lens. The detection probability is proportional to mp, where mp is the planet mass. All current follow-up teams use dedicated observations on a preselected sample of mainly high-amplification events

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2

Hood, Ben Andrew Ashcom. "Extrasolar planet search and characterisation." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/359.

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Hoyer, Miranda Sergio David. "Search for unseen planets transit timing variations." Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/111555.

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Doctor en Ciencias, Mención Astronomía<br>Observing the changes in the orbital period of transiting exoplanets produced by gravitational perturbations allows to detect unseen orbital companions in the system. With this technique,known asTransitTimingVariations(TTVs),itispossibletodetectperturbers down to Earth-like masses, overcoming the limits of current Radial Velocity searches. This PhDthesishasled to along termproject: TransitMonitoringin theSouth(TraMoS)project, which consists in a methodical and homogeneous monitoring of transiting exoplanets observable from the Southern Hemisphere with

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4

Gaudi, B. Scott. "Microlensing and the search for extrasolar planets /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488199501405399.

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5

Wilson, David M. "The search for transiting extrasolar planets with SuperWASP." Thesis, Keele University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443609.

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6

Mengistie, Getachew Mekonnen. "Gravitational microlensing and the search for extrasolar planets." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/9798.

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Includes bibliographical references.<br>This project is aimed at tackling binary gravitational microlensing events. Since the early conception of gravitational lensing before Einstein’s General Theory of Relativity, physicists and astronomers of the early 18th century speculated that light, if treated as particle, can be affected by gravitational field. Gravitational Microlensing is defined as a phenomenon occurring when light coming from a distant (source) star is bent by the gravitational field of an intervening mass (lens) creating multiple image of the source which cannot be resolved. In t

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7

Hamacher, Duane Willis Physics Faculty of Science UNSW. "A search for transiting extrasolar planets from the southern hemisphere." Publisher:University of New South Wales. Physics, 2008. http://handle.unsw.edu.au/1959.4/40943.

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To date, more than 300 planets orbiting stars other than our sun have been discovered using a range of observing techniques, with new discoveries occuring monthly. The work in this thesis focused on the detection of exoplanets using the transit method. Planets orbiting close to their host stars have a roughly 10 per cent chance of eclipsing (transiting) the star, with Jupiter?sized planets causing a one per cent dip in the flux of the star over a few hours. A wealth of orbital and physical information on the system can be extracted from these systems, including the planet density which is esse

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8

Alsubai, Khalid. "Wide angle search for extrasolar planets by the transit method." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/521.

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9

Turner, Oliver David. "Discovery and characterisation of transiting extra-solar planets with the Wide Angle Search for Planets (WASP) survey." Thesis, Keele University, 2017. http://eprints.keele.ac.uk/3563/.

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In July of 2012 the WASP-South instrument was modified to allow it to collect data on brighter stars. This change was motivated by the dearth of planets known to orbit bright hosts in the southern hemisphere and the depth of study possible for HD209458 b and HD189733 b. These two planets orbit very bright stars in the northern hemisphere and have lead to a wealth of discoveries thanks to the relative ease with which they can be studied. My initial work with the Wide Angle Search for Planets (WASP) project was to contribute to updating the existing automated data reduction pipeline. I investiga

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10

Voss, Holger. "Developing a ground-based search system for transits of extrasolar planets." [S.l.] : [s.n.], 2006. http://opus.kobv.de/tuberlin/volltexte/2006/1354/index.html.

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11

Ashton, Edward James. "The search for slow moving planets in the distant solar system." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/62906.

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Out beyond the giant planets is a collection of bodies left over from planet formation. The objects that are just beyond Neptune are well studied compared to those that journey hundreds of au away; all such objects have been observed inside 100 au. We use a deep narrow survey and an uncommon technique to search for objects currently at large heliocentric distances. Using data from the Outer Solar System Origins Survey (OSSOS), which covered ∼160 square degrees down to r ∼ 25, we searched for objects beyond 300 au. To find such objects we created a catalogue of all of the objects that wer

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12

Hidas, M??rton Gergely Physics Faculty of Science UNSW. "A search for transiting extrasolar planets with the automated patrol telescope." Awarded by:University of New South Wales. School of Physics, 2005. http://handle.unsw.edu.au/1959.4/22803.

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In the past decade some 150 planets have been detected outside our Solar System, mostly via precise radial-velocity measurements of their host stars. Using an alternative method, transit searches have recently added 6 planets to the tally, and are expected to make more significant contributions in the future. The transit method is based on the detection of the tiny, periodic dip in the apparent brightness of a star when an orbiting planet passes in front of it. It requires intensive photometric monitoring of ??? 104 stars, with a precision better than ??? 1%. The 0.5 m Automated Patrol Telesco

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13

Brucalassi, Anna. "Search for extra-solar planets with high precision radial velocity curves." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-173637.

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This Ph.D. Thesis has as general subject the study of extrasolar planets using the radial velocity technique from both, instrumental and observative, points of view. Two main parts compose the work: the upgrade of the spectrograph FOCES, a high resolution spectrograph that will be installed next year at the Wendelstein Observatory, and the search of giant planets around stars in the open cluster Messier-67 (M67).<br>Die vorliegende Dissertation behandelt die Suche von extra-solaren Planeten mit der Radialgeschwindigkeits Methode und zwar sowohl in Bezug auf die dafür notwendige Instrumentieru

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14

Childers, Joseph M. "A search for transiting exoplanets in eclipsing binary stars." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1398708.

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This study presents the development of an observing program to pursue the idea of looking for transiting exoplanets in eclipsing binary stars. The various kinds of orbits a planet might have in a binary system are explored. From this it is shown how to anticipate the possible orbits a planet might have in a given star system. The potential detectability of a planet in a binary system is also analyzed. Together these guidelines enable observers to rank targets by the likelihood that a detectable planet might exist in the system. The results of observations by a team at Ball State University of

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15

Miller, Veronica Ruth. "A Search for Transiting Extrasolar Planets and Variable Stars in the Galactic Plane." Thesis, University of Canterbury. Physics and Astronomy, 2009. http://hdl.handle.net/10092/2858.

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This work describes the observations and results found from a photometric survey of a 0.5° by 0.5° area of the Galactic Plane performed using the 2.2 metre ESO telescope at La Silla, Chile. The dataset comprises a total of 267 images with 204 from a 16 day observation run in 2005 and 63 from a six week observation run in 2002. The new image subtraction reduction algorithm implemented on this data resulted in more than 500,000 lightcurves with a magnitude limit of R ~ 24.5. The precision of the data following reduction is suitable for transit searches as well as identification of variable stars

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16

Street, Rachel. "A search for extra-solar planetary transits in the field of open cluster NGC 6819." Thesis, University of St Andrews, 2002. http://hdl.handle.net/10023/12939.

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The technique of searching for extra-solar planetary transits is investigated. This technique, which relies on detecting the brief, shallow eclipses caused by planets passing across the line of sight to the primary star, requires high-precision time-series photometry of large numbers of stars in order to detect these statistically rare events. Observations of ~ 18000 stars in the field including the intermediate-age open cluster NGC 6819 are presented. This target field contrasts with the stellar environment surveyed by the radial velocity technique, which concentrates on the Solar neighbourho

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17

Giacobbe, Paolo. "Photometric transit search for planets around cool stars from the Western Italian Alps: the APACHE survey." Doctoral thesis, Università degli studi di Trieste, 2014. http://hdl.handle.net/10077/9965.

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2012/2013<br>Small-size ground-based telescopes can effectively be used to look for transiting rocky planets around nearby low-mass M stars using the photometric transit method. Since 2008, a consortium of the Astrophysical Observatory of Torino (OATo-INAF) and the Astronomical Observatory of the Autonomous Region of Aosta Valley (OAVdA) have been preparing for the long-term photometric survey APACHE (A PAthway toward the Characterization of Habitable Earths), aimed at finding transiting small-size planets around thousands of nearby early and mid-M dwarfs. APACHE uses an array of five dedic

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18

Brucalassi, Anna [Verfasser], and Roberto Philip [Akademischer Betreuer] Saglia. "Search for extra-solar planets with high precision radial velocity curves / Anna Brucalassi. Betreuer: Roberto Philip Saglia." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1059351056/34.

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19

Röll, Tristan Alexander [Verfasser], Ralph [Akademischer Betreuer] Neuhäuser, and Thomas [Akademischer Betreuer] Preibisch. "Astrometric search for extrasolar planets in stellar multiple systems / Tristan Alexander Röll. Gutachter: Ralph Neuhäuser ; Thomas Preibisch." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2011. http://d-nb.info/1016683294/34.

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20

Huld, Sigrid. "Manganese-mineralized chemical gardens: an abiotic approach to the search for life on Earth and other planets." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414525.

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21

Deshpande, Rohit. "Search for gas giants around late-M dwarfs." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4640.

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The absolute radial and rotational velocities of our targets were also calculated. Values of rotational velocities indicate that M dwarfs are, in general, slow rotators. Using our result and that from literature, we extended our study of rotational velocities to L dwarfs. Our observations show an increase in rotational velocities from late M to L dwarfs. We also find that the mean periods of M dwarfs are less than 10 hours. In order to improve our precision in measuring relative radial velocity (RV), we employed the use of deconvolution method. With this method we were able to ameliorate relat

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22

Eigmüller, Philipp [Verfasser], Artie P. [Akademischer Betreuer] Hatzes, Reinhard [Akademischer Betreuer] Mundt, and Andrzej [Akademischer Betreuer] Niedzielski. "The search for extrasolar planets and the characterization of variable stars with the Tautenburg exoplanet search telescope / Philipp Eigmüller. Gutachter: Artie P. Hatzes ; Reinhard Mundt ; Andrzej Niedzielski." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2012. http://d-nb.info/1024080439/34.

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23

Mohler-Fischer, Maren [Verfasser], and Thomas [Akademischer Betreuer] Henning. "Search for extrasolar planets around young stars in the presence of stellar activity / Maren Mohler-Fischer ; Betreuer: Thomas Henning." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177382733/34.

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24

Vance, Steven. "High pressure and low temperature equations of state for aqueous magnesium sulfate : applications to the search for life in extraterrestrial oceans, with particular reference to Europa /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/6825.

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25

De, Marchi Fabrizio. "Variable stars and planetary transit search in super metal-rich open clusters." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3427100.

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This PhD thesis presents the analysis of a large sample of photometric data relative to the super metal-rich open clusters NGC6791 and NGC6253. The main goal of the surveys was the search for extrasolar planets using the transits method. I contributed to the extrasolar planet search by making numerical simulations in order to estimate the number of expected transiting planets. Moreover I analyzed the entire sample of light curves in order to find variable stars. I discovered 260 new variable stars in the field of NGC6791 and 597 in the field of NGC6253. The classification of all va

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Baidolda, Farida. "Search for planetary influences on solar activity." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEO001/document.

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L'étude des variations de l'activité solaire et de ses effets sur les environnements climatiques reste une question ouverte, en dépit des nombreux efforts des chercheurs dans les différents domaines de la science. Par ailleurs, l'activité solaire est notamment un aspect important pour comprendre les relations Soleil-Terre et l'espace interplanétaire. Son étude nécessite différents types d'approches basées sur de nombreux modèles physiques. Le sujet de cette thèse est l'étude des influences possibles des perturbations planétaires sur l'activité solaire.Dans cette thèse, on a d'abord rappelé que

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27

Kaminski, Adrian [Verfasser], and Andreas [Akademischer Betreuer] Quirrenbach. "The Search for Extrasolar Planets by the Means of High Precision Astrometry with the Dual-Feed Interferometer PRIMA / Adrian Kaminski ; Betreuer: Andreas Quirrenbach." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177382911/34.

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28

Thaler, Tracey Lyn. "Search for Extraterrestrial Life using Chiral Molecules: Mandelate Racemase as a Test Case." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-04052007-123229/.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2007.<br>Phillip Gibbs, Committee Member ; Rick Trebino, Committee Member ; Christoph Fahrni, Committee Member ; Donald Doyle, Committee Member ; Andreas Bommarius, Committee Chair.

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Вівдіч, І. К. "Екзопланети". Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/44012.

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Світ не стоїть на місці, а людська думка немає кордонів. Тому як тільки з’явилися ідеї стосовного то, що зірки в небі – це віддалені об’єкти, як наше Сонце, відразу почали розмірковувати про те, що є вірогідність існування планет навколо них та життя на цих тілах.

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Komlaga, Gustav. "Search for antiplasmodial compounds from Ghanaian medicinal plants." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS265/document.

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Une enquête ethnobotanique a été menée en Bosomtwi et Sekyere Est Districts de la Région Ashanti, au Ghana, en utilisant des questionnaires validés pour identifier les plantes traditionnellement utilisées pour gérer le paludisme. Cinq plantes avec une utilisation élevée ont été sélectionnés et une extraction préliminaire des matières végétales sélectionnées effectuées avec de l'eau, le methanol, l'acétate d'éthyle et d'éther de pétrole. Les extraits ont été dosés pour l'activité antiplasmodiale utilisant les méthodes antiplasmodiales in vitro. Les deux les plus prometteuses plantes, Phyllanthu

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Sampson, Julia Helen. "The search for analgesic drugs from higher plants." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338429.

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32

Montgomery, Ryan Michael. "Planet formation and searches /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2009. http://uclibs.org/PID/11984.

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33

Dominis, Dijana. "The role of binary stars in searches for extrasolar planets by microlensing and astrometry." Phd thesis, Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2006/1081/.

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34

Marshall, P. S. "A search for novel crop pesticides in plants via phytalexin induction." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380845.

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35

Ryan, Patrick Thomas. "Methods for extra-solar planet searches." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290663.

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Many groups are trying to find faint stellar companions using a variety of techniques. The most obvious is to take long exposure pictures. Here adaptive optics (AO) is useful in correcting the blurring effects of the atmosphere. Starlight is concentrated into a tighter peak and less energy is put into the surrounding halo. Another method is to look for periodic decreases in a star's irradiance due to a planet blocking some of the light as it crosses in front of the star or transits. The most productive technique so far has been to look for periodic doppler shifts in the light coming from a can

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36

Turnbull, Margaret C. "The search for habitable worlds: From the Terrestrial Planet Finder to SETI." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/290131.

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The primary topics of this dissertation are (1) target selection for searches for extrasolar life, especially for the Search for Extraterrestrial Intelligence (SETI) and the Terrestrial Planet Finder (TPF) and (2) remote detection of biosignatures, especially with regard to TPF. Chapter 1 gives a brief introduction to the field of astrobiology, and to the search for life on other planets. Chapters 2 and 3 ask, "What are the best places in the Universe to search for Earth-like life?" A class of stars, "habstars," is defined as stellar systems that are potentially habitable to Earth-like complex

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Wickens, Kristen M. "A search for biologically active compounds in Acacia (Mimosaceae) species." Thesis, Curtin University, 2003. http://hdl.handle.net/20.500.11937/1262.

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Indigenous Australians were also known to use plants for medicinal purposes. For thousands of years, Indigenous Australians have used native plants as a source of medicinal agents. Some tribes living in Central Australia still, to this day, prefer to use traditional medicines in favour of the more common and readily available western medicines. A number of plant species endemic to Australia are listed in various Aboriginal pharmacopoeias, with approximately one-third of those species belonging to two genera, Acacia and Eremophila. Of the 1100 recognised species of Acacia, approximately 900 occ

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McMahon, De'Awna Raquel. "The search for cancer drugs active against signal transduction targets in higher plants." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/30298.

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Picogna, Giovanni. "Planet formation in binary star systems and its relevance during target selection for extrasolar planet search with the transit method." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424033.

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In this Thesis I have studied the impact of binary stars on planet formation and evolution in order to maximize the process of target selection in a future space mission devoted to planet detection. The impact has been firstly addressed via a statistical analysis of the frequency and characteristics of planets in those complex systems. Then, a more in-depth investigation has been made by modeling different planet formation stages in circumbinary and circumstellar environments. I have also studied the impact of close stellar encounters on the evolution of planetary systems in order to explore

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Buhariwalla, Hutokshi Keki. "Bacterial L-form associations with plants." Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU542133.

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L-form bacteria can be induced in vitro by the treatment of cell walled bacteria with compounds which suppress cell wall synthesis. It has previously been demonstrated that a variety of bacterial L-forms could invade plant-cells and establish a novel symbiotic association within the plant-host, with no apparent host limitations. Such associations were mainly recognised by direct microscopy and immunological detection techniques. The main aim of this project was to develop and optimise a reporter gene system for the detection of genetically modified Bacillus subtilis and Pseudomonas syringae pv

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Cubillos, Vallejos Patricio Ernesto. "A High Resolution Spectroscopic Search For The Thermal Emission of The Extrasolar Planet HD 21707 B." Tesis, Universidad de Chile, 2011. http://repositorio.uchile.cl/handle/2250/102569.

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En este trabajo hemos retomado y afinado un método de correlación para buscar directamente, en alta resolución, el espectro de planetas extrasolares sin tránsito. Nuestro objetivo principal es caracterizar las propiedades físicas de estos objetos, específicamente la inclinación de su órbita, su masa y la proporción de los flujos entre el planeta y su estrella. Esta técnica se vale del efecto Doppler causado por el movimiento orbital del planeta y la estrella en torno al centro de masa del sistema. Para observaciones lo suficientemente extensas, el espectro del planeta se va a desplazar c

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Haywood, Raphaëlle D. "Hide and seek : radial-velocity searches for planets around active stars." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7798.

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The detection of low-mass extra-solar planets through radial-velocity searches is currently limited by the intrinsic magnetic activity of the host stars. The correlated noise that arises from their natural radial-velocity variability can easily mimic or conceal the orbital signals of super-Earth and Earth-mass extra-solar planets. I developed an intuitive and robust data analysis framework in which the activity-induced variations are modelled with a Gaussian process that has the frequency structure of the photometric variations of the star, thus allowing me to determine precise and reliable pl

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Yam, Jianying. "The search for bioactive compounds in tropical plants to target hormone imbalance associated diseases /." Basel : [s.n.], 2008. http://edoc.unibas.ch/diss/DissB_8163.

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Wickens, Kristen M. "A search for biologically active compounds in Acacia (Mimosaceae) species." Curtin University of Technology, Department of Environmental Biology, 2003. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=15212.

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Indigenous Australians were also known to use plants for medicinal purposes. For thousands of years, Indigenous Australians have used native plants as a source of medicinal agents. Some tribes living in Central Australia still, to this day, prefer to use traditional medicines in favour of the more common and readily available western medicines. A number of plant species endemic to Australia are listed in various Aboriginal pharmacopoeias, with approximately one-third of those species belonging to two genera, Acacia and Eremophila. Of the 1100 recognised species of Acacia, approximately 900 occ

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Standing, Dominic Benjamin. "Growth and survival of plants in patchy environments." Thesis, University of Aberdeen, 2001. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU136920.

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Plants, as sessile organisms, have evolved many strategies to survive in a changing environment. Three key phenomena are considered in the present study: (1) morphological changes associated with C allocation to roots and shoots in favour of the most limiting resource; (2) differential C allocation to root pieces growing in relatively high nutrient patches and (3) physiological adjustment to the nutrient environment by up- or down regulating specific nutrient uptake rates. Plants exist as individuals within populations or communities. The aim of this study was to explore some of the dynamics,

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Birkemeyer, Claudia Sabine. "Signal-metabolome interactions in plants." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2006/714/.

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From its first use in the field of biochemistry, instrumental analysis offered a variety of invaluable tools for the comprehensive description of biological systems. Multi-selective methods that aim to cover as many endogenous compounds as possible in biological samples use different analytical platforms and include methods like gene expression profile and metabolite profile analysis. The enormous amount of data generated in application of profiling methods needs to be evaluated in a manner appropriate to the question under investigation. The new field of system biology rises to the challenge

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Raudsepp-Hearne, Ciara. "Potential for using insects to guide the search for medicinally-active chemical compounds in plants." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80859.

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This thesis investigates the possibility of using aposematic insects as guides to plants that contain pharmacologically-active compounds. Plants were monitored within national parks in the Republic of Panama over a period of six months and all insects feeding on them were collected and raised in captivity. The insects were then extracted and analyzed to determine how they were treating toxic chemical compounds in their host plant. Two principal plants were investigated with their associated insects: (1) Vismia baccifera and (2) Mikania guaco. One generalist and one specialist Lepidopter

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Moran, Jonathan Andrew. "The role and mechanism of Nepenthes rafflesiana pitchers as insect traps in Brunei." Thesis, University of Aberdeen, 1991. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU547158.

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Investigations were made into the trapping biology of the pitchers of Nepenthes rafflesiana (Jack), Family Nepenthaceae, in Brunei, Borneo. The plant produces two distinct pitcher forms, upper and lower, which were found to differ in their prey spectra. Although ants were the most important prey in both forms, the upper form caught more anthophilous insects than the lower. High contrast U/V patterns on the upper pitchers were found to contribute to the attraction of some anthophilous insects, as was the fragrance of upper pitcher fluid. Increased height above ground was also found to increase

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Kose, Lerato Esther. "A search for taxonomically informative characters in the large genus Heliophila L. (Brassicaceae/Cruciferae)." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52694.

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Thesis (MSc)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT:Several authors regard the subdivision of the large genus Heliophila as unsatisfactory and in need of a detailed taxonomic study. Previous studies on this genus were based exclusively on gross external morphological characters. The present study investigates patterns of variation in Heliophila in order to identify taxonomically informative characters that could be used in the subdivision of this large genus. The study differs from previous studies in Heliophila because, in addition to macro-morphology, it employs micro- morp

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50

Banerjee, Manas Ranjan. "Characterisation of microbial release of available sulphur from soil to plants." Thesis, University of Aberdeen, 1992. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU043866.

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The discovery of sulphur-deficient agricultural soils has focussed concern on the dynamics of sulphur transformations in soils and on the important role of the soil microbial population in mineralising organic sulphur to forms more available to plants. This thesis reports a study carried out to investigate the dynamics of supply of plant available sulphur from soils and includes development of a method for determination of microbial biomass S, comparison of a perfusion system with a plant bioassay to assess soil S-supply, characterisation of a fertilizer S budget for a crop-soil system and ass

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