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Dissertations / Theses on the topic 'Limiting factor'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Lindström, Gustaf. "Is GSM-R the limiting factor for the ERTMS system capacity?" Thesis, KTH, Trafik och logistik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101811.

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The European Rail Traffic Management System, ERTMS, is introduced as a common signalling system for the European railway network. ERTMS consist of two main parts, the signalling part ETCS and the radio transmission system GSM-R, based on the well-established GSM standard. The question to be answered in this thesis is if the capacity of GSM-R is limiting the ETCS part in any way. If that is the fact, how can the limitations be overcome? Looking forward, will public mobile system with high transmission capacity like GPRS, LTE etc influence GSM-R? GSM-R year 2020: how will it look? The thesis des

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2

Zehmer, John Kinsley. "Calcium as a Limiting Factor in the Distribution of the Amphipod Gammarus pseudolimnaeus." W&M ScholarWorks, 1998. https://scholarworks.wm.edu/etd/1539626165.

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3

Wiles, Karen Anna, and n/a. "Coxsackie and Adenovirus Receptor (CAR) expression is a potential limiting factor in adenoviral oncotheraphy." University of Otago. Dunedin School of Medicine, 2007. http://adt.otago.ac.nz./public/adt-NZDU20070619.161353.

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Novel approaches to cancer treatment in the context of Gene Therapy have been gaining popularity as an alternative to conventional therapies which have proven to lack specificity, resulting in tumour cell resistance, tumour progression and mortality. As a consequence the use of adenoviruses has been widely developed not only as a replication deficient vector for gene therapy but also as a replication competent oncolytic agent designed to selectively target and kill tumour cells. Unfortunately their success in clinical application has been limited, and it has been suggested that a lack of the p

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4

Kobayashi, Takuma. "Study on Defects in SiC MOS Structures and Mobility-Limiting Factors of MOSFETs." Kyoto University, 2018. http://hdl.handle.net/2433/232043.

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5

Poirot, Ceisha Iana. "The role of predation as a limiting factor ofbellbird (Anthornis melanurai) nest success in New Zealand." Thesis, University of Canterbury. Biological Sciences, 2004. http://hdl.handle.net/10092/1528.

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Nest success, feeding behavior and anti-predator strategies, were studied to determine if bellbirds (Anthornis melanura) are limited by predation and if pest control can relieve the pressures of predation so that food supply may become a limiting factor for bellbirds. The nest success of bellbirds at the Rotoiti Nature Recovery Project (RNRP), Nelson Lakes, New Zealand (2002-2004 breeding seasons) was compared with data from other bellbird nest success studies in New Zealand. Two years of nest monitoring resulted in a low overall nest success at the RNRP (39 %), an area low in predator density

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6

Checchin, Mattia. "Physics of limiting phenomena in superconducting microwave resonators| Vortex dissipation, ultimate quench and quality factor degradation mechanisms." Thesis, Illinois Institute of Technology, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245132.

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<p> Superconducting niobium accelerating cavities are devices operating in radiofrequency and able to accelerate charged particles up to energy of tera-electron-volts. Such accelerating structures are though limited in terms of quality factor and accelerating gradient, that translates—in some cases—in higher capital costs of construction and operation of superconducting rf accelerators. Looking forward for a new generation of more affordable accelerators, the physical description of limiting mechanisms in superconducting microwave resonators is discussed. In particular, the physics

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7

FORNAROLI, RICCARDO. "Environmental Gradients and Ecological Processes as Constraints in the Distribution Patterns of Freshwater Biological Communities." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/69695.

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The hypothesis that I tested in my research was that, often, the relationship among distribution of organisms and environmental gradients can be successfully evaluated as a limiting factor using the proper analytical methods. Firstly, I used quantile regression to describe the limiting action of both physical habitat characteristics and other environmental variables, on macroinvertebrate density and diversity. This study was conducted in rivers and streams belonging to two countries: Italy and Finland. The results can contribute to the definition of bioassessment indices and can be used wi

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8

Epler, Amee J. "College students' reasons for abstaining or limiting drinking factor structure, predictors, and relations to abstention and alcohol-related outcomes /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/5877.

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Thesis (M.A.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 13, 2007) Vita. Includes bibliographical references.

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9

Kulifaj, Michel. "Tuber melanosporum Vitt. (Truffe noire du Périgord), caractérisation des étapes du développement de l'ascocarpe, études des facteurs externes limitants." Toulouse 3, 1994. http://www.theses.fr/1994TOU30162.

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La truffe noire de Périgord, Tuber melanosporum Vitt. A suscité, de par ses qualités gastronomiques et sa croissance mystérieuse un intérêt économique mais également scientifique. Il est cependant surprenant de constater qu'après de nombreux travaux sur la systématique du groupe auquel appartient cet ascomycète, peu de recherches d'ordre physiologique n'ont été entreprises : c'est dans ce domaine que nous avons inscrit ce travail. En outre, si la plus grande partie des expérimentations portent sur la phase végétative qui correspond à la vie symbiotique que le mycélium entretient avec les radic

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10

Bornot, Julie. "Caractérisation et quantification rationnelles de la physiologie de Deinococcus geothermalis par une approche de génie nutritionnel." Phd thesis, INSA de Toulouse, 2013. http://tel.archives-ouvertes.fr/tel-01073388.

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Les bactéries du genre Deinococcus sont des microorganismes qui présentent des propriétés remarquables de résistance aux conditions extrêmes telles que les radiations ionisantes, les stress oxydatifs, la dessiccation ou encore les températures extrêmes. L'exploitation de leurs capacités présente donc un réel intérêt pour les procédés biotechnologiques de production de métabolites d'intérêt, les biocarburants. Néanmoins, la physiologie et le métabolisme de ces microorganismes ont été très peu étudiés à ce jour. L'objectif de ce travail est d'identifier les exigences nutritionnelles d'une souche

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11

Streiff, Kathy. "Optimisation de la production de semences hybrides de blé tendre : détermination des facteurs limitants." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL023N.

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Dans la perspective d'améliorer le niveau et la régularité du rendement en semences hybrides, nous nous sommes intéresses aux facteurs limitants le potentiel des 2 lignées parentales. En ce qui concerne la lignée porte graine, en conditions contrôlées, deux doses d'ACH sont testées et sont comparées à la castration manuelle. Quel que soit le traitement, les stigmates restent réceptifs (c'est à dire que les grains de pollen peuvent y germer) pendant au moins 12 jours. Par contre, au niveau de la réceptivité des ovaires, une période de 7 jours est dégagée. Durant cette période, à la fois la quan

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12

Plénet, Daniel. "Fonctionnement des cultures de maïs sous contrainte azotée : détermination et application d'un indice de nutrition." Vandoeuvre-les-Nancy, INPL, 1995. http://docnum.univ-lorraine.fr/public/INPL_T_1995_PLENET_D.pdf.

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Nos objectifs sont de déterminer la demande en azote des cultures de maïs et d'analyser l'impact de la contrainte azotée sur leur fonctionnement. Pour comparer différentes doses d'azote et le fractionnement des apports, nous avons étudié les cinétiques de croissance des cultures irriguées pendant 4 années dans le sud-ouest de la France. Nous avons déterminé une relation allométrique critique entre la teneur en azote et la biomasse aérienne accumulée pour diagnostiquer le statut azote du maïs. Nous définissons un indice de nutrition azotée (INN) pour étudier les effets des traitements azotés. I

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13

Kramarova, Tatiana. "Limiting factors in ATP synthesis." Doctoral thesis, Stockholm : Wenner-Gren Institute for Experimental Biology, Stockholm university, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-987.

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14

Yamin, Moh'd. "LANDSLIDE STABILIZATION USING A SINGLE ROW OF ROCK-SOCKETED DRILLED SHAFTS AND ANALYSIS OF LATERALLY LOADED DRILLED SHAFTS USING SHAFT DEFLECTION DATA." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1196960547.

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15

Roberts, Kimberley Jessica. "Factors limiting invertebrate recovery during stream restoration." Thesis, University of Canterbury. biological science, 2012. http://hdl.handle.net/10092/10373.

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Many stream restoration projects, as part of returning a degraded ecosystem to a healthier state, aim to restore aquatic invertebrate populations. Unfortunately, many attempts only „beautify‟ streams without achieving improvements in biodiversity. Lack of connectivity of a restoration site to a regional species pool may explain some failures. I tested this by collecting larval and adult aquatic insects from an agriculturally impacted Canterbury high country stream to evaluate connectivity of the regional species pool. The stream was surrounded by high-quality habitat in an adjacent National Pa

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16

Self, Zoe T. "The biomechanical factors limiting athletic performance in racehorses." Thesis, Royal Veterinary College (University of London), 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.572480.

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17

Stanley, Jordan. "Yield-Limiting Factors in North Dakota Soybean Fields." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28382.

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Average soybean [Glycine max (L.) Merrill] yields in North Dakota remain below north central USA averages, and crop yield potentials. The effect of planting date (PD), cultivar relative maturity (RM), and seeding rate (SR), on yield, were evaluated in 821 producer fields in 2014-2016 seasons. Crop management varied by location. State average PD was 19 May, and planting after 1 May reduced yield average 0.4% d-1. Planting a cultivar with 0.1 RM earlier than recommended reduced yield by 1.3%. Producers estimated seedling mortality at 10%; when observed, it was 12.3%. An additional 7.9% reduction

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18

Lindberg, Emil. "Limiting factors of periphytic algae in Arctic streams." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133300.

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Algae are the most common primary producers in stream ecosystems, contributing as much as 80 % of the total primary production. The production of these ecosystems is strongly influenced by the terrestrial habitats, which are in turn likely to be altered by climate change. In arctic ecosystems, where the effects of climate may be most pronounced, there are important unknowns about how abiotic factors such as light, temperature, nutrients, flow regimes interact to influence stream productivity. This study therefore aimed to understand what controls the rate of benthic algal growth in Arctic stre

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19

Hobson, Ruth M. "Central fatigue during exercise : potential manipulations and limiting factors." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6975.

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The development of fatigue has been an area of interest to athletes and scientists alike for many years. Often, particularly during prolonged exercise in the heat, there is no obvious peripheral reason for fatigue and the central nervous system is cited as the source. The mechanisms and potential manipulations of this fatigue remain largely unclear. Chapters Three and Four attempted to reduce the transport of the serotonin precursor tryptophan into the brain in order to reduce or delay serotonin synthesis and therefore increase exercise capacity. In Chapter Three branched-chain amino acid drin

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20

Weiler, Lazarz Annalisa M. "Factors limiting native species establishment on former agricultural lands." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5564.

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Restoration of abandoned, nonnative species-dominated agricultural lands provides opportunities for conserving declining shrubland and grassland ecosystems. Land-use legacies, such as elevated soil fertility and pH from agricultural amendments, often persist for years and can favor nonnative species at the expense of native species. Understanding the factors that limit native species establishment on abandoned agricultural lands can provide important insights for restoration and conservation of native species on human-modified lands. I conducted two field experiments on abandoned agricultural

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21

McKeown, Jim. "Factors limiting township learners from discovering and developing their talents." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/d1014323.

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Discovering and developing one’s talents significantly increases the likelihood of one leading a meaningful and fulfilling life, realising success in the world, and breaking out of the cycle of poverty. It should be the responsibility of schools to provide opportunities for learners to discover and develop talents that they are passionate about. This passion will then create a self-reinforcing cycle in which learners are more motivated to work hard in school and further develop their talents. Therefore, discovering and developing one’s talents should be seen as both a means to improved educati

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22

Bowerman, Tracy. "A Multi-Scale Investigation of Factors Limiting Bull Trout Viability." DigitalCommons@USU, 2013. http://digitalcommons.usu.edu/etd/1524.

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Effective conservation strategies for imperiled species require an understanding of processes that influence fitness throughout the organism's life cycle and across the range of habitats needed to complete that cycle. I evaluated factors that affect population viability of bull trout Salvelinus confluentus, a threatened freshwater char species, throughout individual life stages and over the entire life cycle. I assessed the relationship between bull trout egg incubation success and environmental variables. Egg survival was negatively related to the percent of fine sediment in redds and positiv

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Bowerman, Tracy E. "A multi-scale investigation of factors limiting bull trout viability." Thesis, Utah State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3560810.

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<p> Effective conservation strategies for imperiled species require an understanding of processes that influence fitness throughout the organism's life cycle and across the range of habitats needed to complete that cycle. I evaluated factors that affect population viability of bull trout <i>Salvelinus confluentus, </i> a threatened freshwater char species, throughout individual life stages and over the entire life cycle. </p><p> I assessed the relationship between bull trout egg incubation success and environmental variables. Egg survival was negatively related to the percent of fine sedimen

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24

Arthur, Tara L. (Tara LeeAnne). "Factors limiting the surface finish of three dimensional printed parts." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10927.

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25

Kestemont, Bruno. "Les indicateurs de développement durable: fondements et applications." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210086.

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Existe-t-il un consensus scientifique sur les conditions de la durabilité ?Est-il possible de construire un indicateur unique de soutenabilité faible ?Quelles sont les composantes objectives et subjectives des indicateurs ?Peut-on envisager des indicateurs objectifs de soutenabilité ?Quelles voies de recherche sont-elles nécessaires pour développer des indicateurs de développement durable ?Telles sont les questions auxquelles cet ouvrage tente de répondre.<p><p>La comparaison des courants de la soutenabilité faible et de la soutenabilité forte nous sert de fil conducteur pour évaluer la part n

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Joly, Damien Oliver. "Brucellosis and tuberculosis as factors limiting population growth of northern bison." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63882.pdf.

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27

Liu, Xiang-Hong. "Studies on limiting factors relating to the cryopreservation of fish embryos." Thesis, University of Bedfordshire, 2000. http://hdl.handle.net/10547/336676.

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Cryopreservation of fish embryos has proven to be a difficult problem in cryobiology. Three main difficulties have been identified or suspected: 1) embryo membrane permeability barriers to cryoprotectants and water; 2) high chilling sensitivity of the embryos; and 3) the twocompartment nature of the embryos with a large yolk. Using the zebrafish embryo as a model system, these limiting factors and possible approaches to overcoming them were investigated with a view to developing an effective procedure for fish embryo cryopreservation. Compared to previous studies, vitrification of zebrafish em

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Karpul, David. "Limiting factors in acoustic density separation of carbon particles in air." Thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5195.

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Particles suspended in a fluid that is exposed to an acoustic standing wave experience a time-averaged force that drives them to either the pressure nodes or anti-nodes of the wave. Several filter designs have been successfully implemented using this force to filter small particles in liquids with low flow rates and small cross-sectional areas. It has been suggested that the filtration of small solid particles out of a gas, such as carbon in air (smoke), would be a possible application of acoustic density separation. The emissions created by the combustion of hydrocarbons used in industrial pr

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Liu, Haixia. "Amelioration of factors limiting the use of lipid-based diesel products." [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1468112.

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30

Yates, Colin John. "Factors limiting the recruitment of Eucalyptus salmonophloia F. Muell. (Salmon gum)." Thesis, Yates, Colin John (1994) Factors limiting the recruitment of Eucalyptus salmonophloia F. Muell. (Salmon gum). PhD thesis, Murdoch University, 1994. https://researchrepository.murdoch.edu.au/id/eprint/52014/.

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Woodlands dominated by Eucalyptus salmonophloia F. Muell. occur throughout the fragmented landscape of the Western Australian wheatbelt. In most of these remnant woodlands there is no regeneration of E. salmonophloia and this has become a concern for the conservation of biodiversity in the region. The research reported in this thesis contributes to solving this problem firstly by describing aspects of E. salmonophloia's life history, and secondly by documenting the conditions under which recruitment has occurred in unfragmented populations to the east of the Western Australian wheatbelt. P

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31

Galinier, Thomas. "Analyse multifactorielle de la performance des cultures - Méthodes et automatisation pour l’intégration de données agronomiques, environnementales, sociales et économiques - Exemple du maïs grain non-irrigué en Amérique du Nord." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC026.

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La demande mondiale de nourriture et d’energie est en constante augmentation. L’accès à de nouvelles terres arables étant limité, les agriculteurs devront produire environ 70% de plus par hectare d'ici 2050. L'optimisation et la rationalisation des systèmes de production agricole sont essentielles pour assurer la sécurité alimentaire des populations dans des conditions durables. La communauté agricole serait en mesure d'optimiser les performances des cultures en ayant accès à une meilleure compréhension des systèmes de production, notamment concernant leur potentiel et principaux facteurs limi

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Heber, Nicole. "An investigation of the factors limiting compost production and utilization in Ontario." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58344.pdf.

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Richardson, Michael John. "Factors limiting the colonization success of an introduced exotic fish (Carassius auratus)." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40235.

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The goldfish (Carassius auratus) is a hardy exotic species that have established sporadically distributed feral populations throughout North America. In one shallow seasonally anoxic pond goldfish formed a large stunted population of 15-17,000 ind ha$ sp{-1}$, with 53% being small young of the year. Goldfish were predominantly benthic herbivores with little diet overlap with resident red-spotted newts (Notapthalmus v. viredescens). Thus in relatively simple systems lacking fish predators goldfish can be very successful. However in systems with a complex native fish community, goldfish have had

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34

Andanje, Samuel A. "Factors limiting the abundance and distribution of hirola (Beatragus hunteri) in Kenya." Thesis, University of Newcastle Upon Tyne, 2002. http://hdl.handle.net/10443/1048.

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This study investigates the factors limiting the abundance and distribution of hirola, or Hunter's antelope, (Beatragus hunteri), in Kenya's Tsavo East National Park (ex-situ population) and Garissa (in-situ popUlation). The hirola is widely recognized as the most severely threatened monotypic species of antelope in sub-Saharan Africa. Data were collected between 1996 and 2000 on the ex-situ population, with occasional comparative sampling of the in-situ population. The study was carried out almost entirely in the field. Hirola were located by ground searching, by radio tracking and occasional

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Brandt, Michael. "Factors limiting benthic algal abundance in Virginia streams of the Coastal Plain." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1878.

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Algae are important components of stream food webs and often used in biomonitoring assessments. Little is known regarding the factors that limit their abundance in streams of the VA Coastal Plain. The surficial geology of the Coastal Plain is predominately sandy deposits which comprise the dominant substrate in streams of this region. In a comparative study of five streams located near the VCU Rice Center, we quantified substrate composition, light availability, and nutrient concentrations to assess their relative importance in determining benthic algal abundance. The proportion of stream

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36

Amundsson, Katharina. "Control of marine plankton respiration : High temperature sensitivity at low temperatures influenced by substrate availability." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-128624.

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Temperature dependence of marine plankton respiration is an important factor in understanding the function and changes in the ecosystem of the ocean. The aim of this study is to test the temperature sensitivity (Q10) of plankton respiration. The oxygen optode method was used to measure plankton respiration. Natural water samples from the Baltic Sea was incubated at short (in situ +1, +2, +3°C) and long (in situ +5, +10, +20°C) temperature intervals with influence of dissolved organic matter (DOC). The Arrhenius equation and Q10-model was used to determine the temperature dependence (Q10) of re

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Riley, Joseph Michael Jr. "Factors limiting the regeneration of large-seeded hardwoods in the Upper Coastal Plain of South Carolina." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35443.

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To test factors limiting regeneration of large-seeded hardwoods in the Upper Coastal Plain of South Carolina, we planted one-year old bare root Quercus alba L. and Cornus florida L. seedlings in pine plantation understories and adjacent clearcuts. We hypothesized that soil moisture, light, and leaf and stem herbivory would have relatively strong effects on growth and survival during the first two years after planting. Next to each seedling, we measured five abiotic factors (soil carbon and moisture, gap light index (GLI), and available nitrogen and phosphorus). We also estimated percent ste

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Hogan, Charlene M. "Enzymatic and structural factors limiting hydrolysis of cellulose by Trichoderma harzianum E58 cellulases." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5574.

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Rorke, Stafford Conroy. "The contribution of psychogenic factors limiting prolonged work performed at different relative intensities." Thesis, Rhodes University, 1986. http://hdl.handle.net/10962/d1004772.

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This study investigated the physiological and psychological limitations to prolonged work performed at different relative intensities, through the use of an eclectic integrative methodology. Ten young male caucasian subjects (mean V0₂ max. 60,0 ml.kg⁻¹.min⁻¹ ± 7,9) were randomly exposed to treadmill runs at each of four relative intensities, namely 55%, 65%, 75% and 85% of V0₂ maximum, with the instruction to run to the point of subjective discomfort at which they were no longer willing to continue. Physiological measures of oxygen consumption (V0₂), heart rate (HR), respiratory exchange ratio

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Cheng, Wai-ming Warman. "Limiting factors in promoting corporate fitness in Hong Kong : employers' and employees' perspectives." HKBU Institutional Repository, 1997. http://repository.hkbu.edu.hk/etd_ra/156.

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Girardoz, Sandrine Barbara Manon. "Mortality factors affecting the invasive moth Cameraria ohridella (Lep. Gracillariidae) and factors limiting the impact of native parasitoids." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429515.

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42

Anikeev, Igorʹ Yu. "Study of limiting factors and methods of optical phase conjugation by stimulated Brillouin scattering." Title page, table of contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09pha597.pdf.

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Includes bibliographical references (leaves 205-227) A study of phase conjugation by stimulated Brillouin scattering is presented with emphasis on the limiting factors, such as aperture and polarization losses, spatial coherence and saturation of the incident wave on the quality of phase conjugation, as well as the application of stimulated Brillouin scattering to loop phase-cojugated mirror and intracavity-SBS-cell-phase-conjugated oscillator.

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Mayfield, Mariah Pine. "Limiting factors for trout populations in the upper Clark Fork River superfund site, Montana." Thesis, Montana State University, 2013. http://etd.lib.montana.edu/etd/2013/mayfield/MayfieldM0513.pdf.

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Large-scale heavy metal contamination of the upper Clark Fork River from mining deposits has created significant damage to aquatic habitat in the drainage. Trout are present in the system, although with abundances lower than expected. The objectives of this study were to identify critical habitat areas and to identify conditions that continue to limit both native and nonnative trout populations, with the focus of the study on the lingering environmental effects caused by high heavy metal concentrations. A radiotelemetry study, with 256 tagged brown trout Salmo trutta, westslope cutthroat trout

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Manna, G. "Factors limiting the in-service lifetime of CrMoV steels and weldments for pressure equipment." Thesis, Swansea University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637996.

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This research project addresses the factors limiting the lifetime of industrial components for pressure equipment used in particular in the petrochemical industry but also strongly linked conventional energy production plants. Hydrogen attack, and the combined effect of both creep and hydrogen attack, are the key phenomena forming the object of study. These are frequently the cause of damage and catastrophic failures, with huge economic impact on the affected plants. As the study is of industrial relevance, tests representative of the industrial reality have been carried out under simulated co

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Kinston, Elaine Mary. "The factors limiting the use of autumn herbage as a feed source for sheep." Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417717.

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Mdawar, Ola. "Les accrus de frêne (Fraxinus excelsior L.) à l'interface environnement/sylviculture dans les Pyrénées Centrales : distribution spatiale et croissance." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT016A/document.

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Le changement des pratiques agricoles et surtout pastorales dans les Pyrénées Centrales a entraîné une colonisation des terres par le frêne (Fraxinus excelsior L.) en constituant des peuplements denses et fréquents dans le paysage pyrénéen. Ce travail est centré sur l'étude de la répartition actuelle et future de ces peuplements qu'on appelle "des accrus" et sur leur potentialité de croissance en relation avec les facteurs qui peuvent être limitants dans la perspective d'une valorisation économique de ces accrus. L'étude de la croissance a été réalisée à trois niveaux : la croissance en hauteu

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Grandisson, Mariane. "Gestion des systèmes d'agriculture itinérante sur brûlis dans l'ouest Guyane : contribution à l'étude de la reproductibilité et de la fertilité." Antilles-Guyane, 1997. http://www.theses.fr/1997AGUY0024.

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L'agriculture itinérante sur brulis (ai) est un mode de culture pratique sans intrant. Après deux ou trois cycles de cultures, la dégradation de la fertilité des sols contraint les agriculteurs à déplacer leurs cultures et le terrain est laisse en jachère. La jachère permet de reconstituer une biomasse, qui libèrera lors de la période de production suivante, après brulis, des éléments minéraux nécessaires à la croissance et au développement des cultures. Cette étude consistait, à fournir des éléments d'appui à la décision, dans le but d'une fixation à terme de ces systèmes traditionnels. Elle

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Messier, Christian. "Factors limiting early conifer growth in salal-dominated cutovers on northern Vancouver Island, British Columbia." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/31130.

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Nutritional stress has been reported in planted and naturally-regenerated conifers growing in association with an ericaceous species, salal (Gaultheria shallon Pursh), in cutovers previously occupied by old-growth western redcedar (Thuja plicata Donn) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) (CH sites) on northern Vancouver Island. No such stress was apparent in cutovers previously occupied by natural, second growth western hemlock and amabilis fir (Abies amabilis (Dougl.) Forbes) stands (HA sites) that developed following windthrow in 1907. The CH ecosystem type occupies as much

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Mannion, Anne Frances. "Limiting factors to high intensity exercise : the role of intramuscular pH and skeletal muscle buffering." Thesis, University of Salford, 1990. http://usir.salford.ac.uk/26797/.

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Within the context of a metabolic model of fatigue, formulated from a review of the literature, a decrease in intramuscular pH was identified as a potential limiting factor to the performance of high intensity exercise (HIE). This suggested a role for skeletal muscle buffering (B) in retarding the intramuscular acidosis typically incurred during HIE. Previous studies on human muscle, were largely unable to confirm this role, partly due to the lack of a clearly defined and consistently utilised method of measurement of B. The validity of the procedures currently employed in the determination of

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Kendrick, Emanuele. "Addressing factors limiting the process efficiency of Pichia pastoris for the production of recombinant proteins." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760873.

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The methylotrophic yeast Pichia pastoris is a popular expression platform for the production of heterologous proteins, has been implemented in over 1500 laboratories and used to produce over 70 marketed proteins. However, despite high volumetric productivities achievable in fermentor culture, and the methanol inducible AOX1 promoter, which can be manipulated to drive high levels of gene expression, P. pastoris suffers from low levels of cell specific productivity for secreted recombinant proteins. This has been attributed to bottlenecks in the secretory pathway, leading to product loss through

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