Tesis sobre el tema "Starvation"
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Robertson, Fiona E. "Starvation-survival in Escherichia coli". Thesis, University of Warwick, 1996. http://wrap.warwick.ac.uk/63636/.
Texto completoDwivedi, Padmanabh. "Carbohydrate starvation and plant respiration". Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624182.
Texto completoPrice-Bishop, G. P. y Phillip R. Scheuerman. "Effects of Starvation on Bacteria". Digital Commons @ East Tennessee State University, 1992. https://dc.etsu.edu/etsu-works/2891.
Texto completoHoward, Jane Katherine. "Leptin, starvation and the immune system". Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396338.
Texto completoPoursaitidis, I. "Identification of differential nutrient starvation responses". Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3019213/.
Texto completoPORCILE, GAETANO. "Subaqueous sand dunes and sediment starvation". Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/941829.
Texto completoThomas, Beth Elene Armstrong. "Regulation of phosphate starvation response in Arabidopsis". Texas A&M University, 2006. http://hdl.handle.net/1969.1/5029.
Texto completoPurdon, Scott Drummond. "Starvation survival response of sulphate-reducing bacteria". Thesis, University of Aberdeen, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340595.
Texto completoBishop, G. P. y Phillip R. Scheuerman. "Physiological Changes in Bacteria During Starvation Stress". Digital Commons @ East Tennessee State University, 1990. https://dc.etsu.edu/etsu-works/2889.
Texto completoBishop, G. P. y Phillip R. Scheuerman. "Physiological Changes in Bacteria During Starvation Stress". Digital Commons @ East Tennessee State University, 1991. https://dc.etsu.edu/etsu-works/2890.
Texto completoLanders, Evan. "CHARACTERIZATION OF THE CHLAMYDIAL PARTNER SWITCHING MECHANISM USING IN VITRO, IN VIVO, AND IN SILICO APPROACHES". OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2326.
Texto completoLaurila, M. (Mirja). "Thermoregulatory consequences of starvation and digestion in birds". Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514277147.
Texto completoAlley, M. R. K. "Molecular biological aspects of nitrogen starvation in cyanobacteria". Thesis, University of Warwick, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383376.
Texto completoDickson, Lorna Mary. "Translation during growth and starvation in Saccharomyces cerevisiae". Thesis, University of Aberdeen, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320770.
Texto completoPorras, Vazquez Alberto. "Lubricant starvation in elastohydrodynamic large-size spinning contacts". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI109.
Texto completoThis thesis is dedicated to the study of large-size spinning contacts located at the interface between the roller-end and the flange in rolling-element bearings. The main goal of the study is to evaluate the influence of lubricant starvation on the film thickness distribution of the contact and analyze how spinning might affect this mechanism. Due to its importance in the reliability and performance of the bearing, the focus is set of the local minimum film thickness found at the low velocity region of the contact area. To tackle this problem, a dual numerical-experimental approach is proposed. The film thickness distribution of spinning contacts is investigated numerically by means of a finite element model previously validated by two dedicated test rigs: Jerotrib and Tribogyr. The simulation of different operating, kinematic, geometric and lubrication conditions enables to write an analytic expression for predicting the aforementioned critical film thickness. At the same time, novel techniques to experimentally induce and control starvation in the contact are implemented into both test rigs and their results are contrasted with those of the simulation. It is demonstrated that the effects of spinning and starvation add up, so that the film thickness distribution of the spinning contact remains asymmetric but tends to a more Hertzian, and therefore thinner, distribution when limiting the oil supply upstream of the contact’s inlet
Busuioc, Monica. "Survival Strategies of Streptococcus mutans during Carbohydrate Starvation". Diss., Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/88876.
Texto completoPh.D.
Streptococcus mutans is a facultative member of the oral plaque and is associated with dental caries. It is able to survive long periods of sugar starvation. The purpose of this project was to explore specific avenues that S. mutans may use in order to cope with carbohydrate deprivation. Intracellular polysaccharide (IPS) is accumulated by S. mutans when grown in excess sugar, and can contribute towards the cariogenicity of S. mutans. Inactivation of the glgA gene, encoding a putative glycogen synthase, prevented accumulation of IPS in batch cultures grown with excess glucose or sucrose. Inactivation of the pul gene, encoding a putative pullulanase which is thought to be involved in IPS catabolism, did not prevent IPS accumulation. IPS was found to be important for the persistence of S. mutans grown in batch culture with excess glucose, and then starved of glucose. In these conditions, the IPS was largely used up within one day of starvation, and yet survival of the parental strain was extended by at least 15 days beyond that of the glgA and pul mutants; potentially, some feature of IPS metabolism, distinct from providing nutrients, is important for persistence. IPS was not needed for persistence when sucrose was carbon source or when mucin was present in batch cultures. IPS accumulation was not clearly demonstrated in biofilm conditions. When grown in condition permissive for IPS accumulation, biofilms of the glgA and pul mutants did not show decreased survival, compared to the parental strain. It is plausible that, within a biofilm, S. mutans can use alternative sources of energy (like the extracellular matrix) to compensate for the lack of IPS. To look at specific genes upregulated by sugar starvation, microarrays analysis was performed on S. mutans batch cultures. Some of the genes upregulated by starved, stationary phase bacteria, appeared to be organized in an operon, thought to encode components of the pyruvate dehydrogenase (PDH) complex. Northern Blot analysis showed that pdhD and the downstream genes, pdhA, pdhB and pdhC, form an operon that is transcribed predominantly in stationary phase. Inactivation of pdhD impaired survival of both batch cultures and biofilms. Analysis with fluorescent reporters revealed a distinct expression pattern for the pdh promoter, with less than 1% of stationary phase bacteria displaying pdh expression. When first detected, after one day of sugar starvation, expression was in individual bacteria. At later times, expressing bacteria were often in chains. The lengths of chains increased with time suggesting growth and division. It is likely that the pdh-expressing sub-population is able to persist for extend times in stationary phase.
Temple University--Theses
Man, Siu-yin. "Adrenomedullin in the rat digestive system response to starvation /". Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B32032298.
Texto completoKlinger, Edward. "The mechanics of lubricant starvation in rolling element bearings /". Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70222.
Texto completoThe case of general capillary number is undertaken via a numerical method. A finite volume approach using curvilinear orthogonal coordinates is implemented. A complete grid generator and flow solver are developed and used to determine the velocity and pressure fields for general capillary number. Results of the numerical and analytical models are compared for low capillary numbers and show good correlation.
Guangteng, Gao. "A study of squeeze and starvation in elastohydrodynamic lubrication". Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388292.
Texto completoMan, Siu-yin y 文小燕. "Adrenomedullin in the rat digestive system: response to starvation". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B32032298.
Texto completoQuan, Zhenzhen. "Regulation of starvation-induced gene expression in Saccharomyces cerevisiae". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610892.
Texto completoHerbert, Kevin Craig. "Characterisation of the starvation-survival response in Listeria monocytogenes". Thesis, University of Sheffield, 2001. http://etheses.whiterose.ac.uk/12837/.
Texto completoMcConnellogue, D. M. "Set shifting, central coherence and starvation in eating disorders". Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1365984/.
Texto completoKarlén, Louise. "State Responsibility Regarding Starvation in Non-International Armed Conflicts". Thesis, Örebro universitet, Institutionen för juridik, psykologi och socialt arbete, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-81618.
Texto completoMinzter, Beth Hillary 1958. "THE EFFECT OF STARVATION ON RECOMBINATION IN PHAGE T4". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276397.
Texto completoLee, Sonia Jean. "Body mass regulation in birds". Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336929.
Texto completoFreitag, Kimberly A. "Effects of Acute Nutritional Deprivation on Lymphocyte Subsets and Membrane Function in Cats". Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46484.
Texto completoMaster of Science
Canadell, i. Sala David. "Potassium starvation responses in yeast highlight novel potassium-related functions". Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/298180.
Texto completoThe maintenance of cation homeostasis is essential for the survival of all living organisms and especially for microorganisms. The yeast Saccharomyces cerevisiae has been used over the years as a model organism for study the processes that control intracellular cation levels. Potassium is the major intracellular cation in yeast and it has been associated with various relevant cellular processes. For this reason, potassium homeostasis is tightly controlled by several transporters, that allow the cation uptake, intracellular traffic and efflux, and by a set of proteins regulating these processes. In spite of the importance of potassium for yeast physiology, not all relevant functional potassium-related targets have been identified. In this work, potassium starvation conditions are used to determine the mechanisms of some of the known potassium functions and to discover new ones. We show that lack of potassium causes major alterations in the transcriptional profile of yeast cells. These transcriptional changes include the marked repression of genes encoding ribosomal proteins and elements necessary for the synthesis and assembly of ribosomes, providing the molecular basis for previously observed halt in protein synthesis caused by potassium deprivation. The elimination of potassium from the medium also causes a drop in cysteine and methionine levels which lead to transcriptional activation of genes related to metabolism of sulfate and biosynthesis of sulfur-contain amino acids. Similarly, cells deprived for potassium accumulate reactive oxygen species which results in oxidative stress. Concomitantly, cells trigger the transcriptional activation of genes necessary to combat oxidative stress, eliminate oxidants and return cells to the proper redox state. Yeast cells growing on ammonium as nitrogen source but lacking potassium accumulate large amounts of intracellular ammonium, which is transported through Trk1 taking advantage of the chemical similarity of both cations. Ammonium accumulation activates the retrograde mitochondrial pathway, resulting in detoxification of ammonium by its integration into amino acids. The complete removal of potassium from the medium leads to growth arrest. Our results show that this arrest could be due to the decrease in cyclins levels and in proteins involved in the assembly of septin rings, elements that are necessary for cell cycle progression. We also have related potassium to the homeostasis of other essential nutrients such as phosphate. Depletion of potassium from the medium or disturbance of normal potassium uptake induces genes involved in the acquisition and release of phosphate, as it is usually observed in a situation of phosphate starvation. Under these conditions, the transcription of PHO-controlled genes is activated by different regulatory elements of the PHO pathway. Situations that impact on normal potassium homeostasis also cause mobilization of the phosphate reserves stored in form of polyphosphates. Potassium restrictions, however, does not alter the levels of intracellular free phosphate but it causes a drop in the levels of ATP and ADP, which could be the signal for the activation of the PHO pathway. In addition, on media with low levels of phosphate, disruption of normal potassium homeostasis effects yeast growth. The results obtained in this work have been crucial to uncover new links between potassium homeostasis and many important cellular processes, in particular establishing the link between the homeostasis of this cation with that of other essential nutrients such as nitrogen, sulfate, and phosphate.
Albano, Caterina. "Representations of food and starvation in early modern English drama". Thesis, Birkbeck (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314188.
Texto completoBourne, Julie. "The response of cyanobacterium Synechococcus sp. WH7803 to phosphate starvation". Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306976.
Texto completoTurner, Kirsty. "The effects of starvation on the survival of Salmonella typhimurium". Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367651.
Texto completoWalsh, Sally. "The isolation and starvation-survival of thermophilic sulphate-reducing bacteria". Thesis, University of Exeter, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307293.
Texto completoMatthus, Elsa. "Phosphate starvation alters calcium signalling in roots of Arabidopsis thaliana". Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/290260.
Texto completoRahman, Muzna. "Speaking starvation : representations of bodily protest in contemporary postcolonial fiction". Thesis, University of Manchester, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.570270.
Texto completoFox, Courtney. "Relationship between Semi-Starvation Symptoms, Self-Efficacy, and Weight Loss". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/42528.
Texto completoMaster of Science
PIGNATTA, SARA. "Starvation-dependent differential stress resistance: a new frontier for radiotherapy?" Doctoral thesis, Urbino, 2018. http://hdl.handle.net/11576/2664031.
Texto completoRaheb, Jamshid. "The molecular and physiological effects of starvation and other stresses on Flexibacter chinensis". Thesis, University of Warwick, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300717.
Texto completoStafford, Jeffrey. "Juvenile Hormone esterase is a conserved regulator of starvation-induced behavior". Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/56249.
Texto completoScience, Faculty of
Zoology, Department of
Graduate
Weldai, Lydia. "Do Major Facilitator Superfamily Domain Containing Proteins Respond to Glucose Starvation?" Thesis, Uppsala universitet, Institutionen för farmaceutisk biovetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-348673.
Texto completoMcDougald, S. Diane School of Microbiology & Immunology UNSW. "Regulation of starvation and nonculturability in the marine pathogen, Vibrio vulnificus". Awarded by:University of New South Wales. School of Microbiology and Immunology, 2000. http://handle.unsw.edu.au/1959.4/19118.
Texto completoPopovici, Gheorghiță. "Effects of lubricant starvation on performance of elasto-hydrodynamically lubricated contacts". Enschede : University of Twente [Host], 2005. http://doc.utwente.nl/50845.
Texto completoJones, Katherine. "The starvation-predation risk trade-off in the chaffinch Fringilla coelebs". Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442521.
Texto completoTaylor, Ian. "'A period of orchestral starvation ?' : concert life in London, 1795-1813". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419117.
Texto completoSivapathasundram, Sudhersha. "The effect of nitrogen starvation on PS2 in the cyanobacterium synechococcus". Thesis, Liverpool John Moores University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275823.
Texto completoHenricot, Beatrice. "A study of the starvation-induced genes of Cladosporium fulvum (Cooke)". Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267544.
Texto completoKilpatrick, Kaylon Ann. "Starvation induces Polycystic Ovarian Syndrome (PCOS) like symptoms in Drosophila melanogaster". Thesis, Mississippi College, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128977.
Texto completoPolycystic Ovarian Syndrome (PCOS) is a metabolic and endocrine disorder that is the most common cause of infertility. PCOS can manifest itself as a long and short term disability and is characterized by insulin resistance (IR), hyperandrogenism, anovulation, hyperinsulinaemia and polycystic ovaries. Our lack of understanding of this disorder and its long term effects has complicated the treatment of the disorder; yet, it is clear that PCOS involves the intricate interaction between genetics, environments and behaviors. To study this disease, scientists have used various animal models. Since the Drosophila model for PCOS has only been postulated,in this work, we determined whether starvation along with the addition of steroid hormones would induce a PCOS-like disorder in D. melanogaster after 24 hour exposure.
In women with PCOS, testosterone levels and the expression of the androgen receptor are elevated. In fruit flies, ecdysone (E) and its “active” form, 20-hydroxyecdysone (20E), are homologous to the human testosterone and 20-hydroxytestosterone, respectively. This hormone is required for circadian cycles, molting, and maturation in insects. More specifically, this hormone is also located in ovarian tissue and aids in follicular development. The receptor for ecdysone is the ecdysone receptor (EcR). In this work, we examined the expression of the ecdysone receptor (EcR) upon starvation for up to 24 hours by immunofluorescence microcopy. Using qRT-PCR, we determined the levels of expression of genes usually associated with inflammation. Ovarian dysfunction was examined by measuring the fecundity of the females. Starvation increases the expression of the EcR and pro-inflammatory gene expression and decreases fecundity, suggesting that Drosophila melanogaster is a potentially useful model organism in the study of PCOS.
Murby, Fredrika. "Phosphorus reduction in wastewater using microalgae with different phosphorus starvation periods". Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-82778.
Texto completoLENAGALA, ROSHAN M. S. "STUDY OF STARVATION ISSUES IN THE IEEE 802.11e MAC LAYER PROTOCOL". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155326763.
Texto completoFlärdh, Klas. "Physiology of carbon starvation and recovery of a marine Vibrio sp". Göteborg, Sweden : Dept. of General and Marine Microbiology, University of Göteborg, 1994. http://catalog.hathitrust.org/api/volumes/oclc/34487576.html.
Texto completoHolmquist, Louise. "Phenotypic and molecular responses to starvation of a marine Vibrio sp". Göteborg, Sweden : Dept. of General and Marine Microbiology, Göteborg University, 1994. http://catalog.hathitrust.org/api/volumes/oclc/34487585.html.
Texto completo