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1
Brown, Peter Robert, and n/a. "Pasture response following rabbit control on grazing land." University of Canberra. Resource & Environmental Science, 1993. http://erl.canberra.edu.au./public/adt-AUC20061113.144813.
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The experiments described in this thesis were designed to assess changes in pasture
dynamics (biomass and species composition of pasture) of grazing land on the Southern
Tablelands of ACT and NSW, after 16 combinations of rabbit control treatments had been
applied. The rabbit control performed by CSIRO Division of Wildlife and Ecology
consisted of all combinations of presence-absence of Poisoning (using sodium
monofluoroacetate, 1080: POIS), Ripping (ripping warrens using a tractor fitted with
ripping tynes: RIP), Fumigation (pressure fumigation using chloropicrin: FUM) and
repeated follow-up fumigation (using phostoxin pellets one, six and eighteen months after
completion of the initial treatment: ANN). The pasture was assessed before treatments
were applied, and every six months after rabbit control treatments. Treatment
combinations were assigned randomly in a 24 factorial design on a total of 32 sites.
There was a significant increase of pasture biomass at the RIP+ANN treatment at
post-treatment sample 5. The analysis of covariance did not detect any other significant
increase or decrease of pasture biomass for any rabbit control treatment, at any posttreatment
sample.
A significant increase of grass species occurred for the treatments of
POIS+RIP+FUM, POIS and RIP+ANN for the post-treatment samples of 1, 3 and 5
respectively. There was a significant increase of thistles at the rabbit control treatments of
POIS+RIP+FUM+ANN (post-treatment sample 1), RIP, ANN, RIP+FUM,
RIP+FUM+ANN and POIS+RIP+FUM+ANN (post-treatment sample 3) and RIP and
FUM+ANN (post-treatment sample 5). A significant increase of weeds occurred at FUM
(post-treatment sample 3) and at FUM+ANN (post-treatment sample 5). No significant
changes in the amount of herbs or legumes was apparent for any rabbit control treatment or
post-treatment sample. There were no significant decreases for any species group. Except
for the significant results for post-treatment sample 1, all significant increases of biomass
for any species group occurred during spring (post-treatment sample 3 and 5) which
suggests a growth phase during spring then subsequent dieback (particularly for thistles and
weeds), as any change was not detected in the following autumn sample. No strong trend
is evident for any particular rabbit control treatments, or any combination of treatments.
Analysis of covariance revealed that the rabbit control treatment of RIP+ANN
showed significant increases in both total biomass of pasture and grass biomass during
post-treatment sample 5. This treatment reduced the number of active entrances the most.
Significant positive correlations were found between pasture biomass (total) with
grass, herb, legume, thistle and weed species groups. Significant negative correlations
between grass biomass and the number of active entrances were found when the rabbit
control had been highly effective in reducing the number of active entrances. When rabbit
control had not been very successful, there was a significant positive but low correlation
with the number of active entrances. There was no significant relationship between the
number of active entrances with the weight of rabbit dung pellets. It is reasoned that they
are different measures of rabbit abundance. More rabbit dung pellets were found closer to
the warren than further away from the warren, but there was no correlation between rabbit
dung and pasture biomass.
Rainfall was above average for most of the experiment, biomass increased
accordingly, and rabbit control was highly successful. The resulting changes in the pasture
were difficult to detect, although some increases in species composition groups occurred.
It is reasoned that the changes observed are partly attributable to seasonal conditions, and
to high rainfall. Grazing by domestic animals, sheep and cattle, had been found to be
consistent throughout the experiment.
2
Lello, Joanne. "The community ecology of rabbit (Oryctolagus cuniculus) parasites." Thesis, University of Stirling, 2003. http://hdl.handle.net/1893/25418.
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This thesis investigates aspects of the community ecology of rabbit parasites with particular emphasis upon the gut helminths, utilising a 23 (later extended to 26) year time series of rabbits and their parasites. A clearer understanding of parasite communities can lead to more effective biological control strategies. Rabbits are regarded as a serious pest species throughout Europe and the Antipodes and the use of the myxomatosis virus, as a biological control agent, has already been tried and failed. However, a clearer picture of the parasite community may offer future possibilities for control. Additionally, the rabbit is a good model for other grazing species, as it carries a similar gut helminth community. Drug resistance is an increasing problem in a wide range of parasites. A clearer appreciation of parasite communities could also aid in the search for effective and environmentally sound pathogen control strategies (e.g. via cross immunity or competition with benign species). Theoretical models have revealed the importance of aggregation to the stability of the host parasite relationship, to parasite evolution and to interspecific parasite interactions. A number of models have considered the effect of varying aggregation upon these dynamics with differing outcomes to those where aggregation was a fixed parameter. Here the stability of the distribution for each of the rabbit helminths was examined using Taylor's power law. The analyses revealed that aggregation was not a stable parameter but varied with month, year, host sex, host age, and host myxomatosis status. Evidence for the existence of interspecific parasite interactions in natural systems has been equivocal. Factors influencing parasite intensity were evaluated for the gut helminth. A network of potential interactions between the parasites was revealed. Only month was shown to be of greater influence on the community. Following, from the above analyses, a community model was constructed which incorporated both seasonal forcing and interspecific parasite interactions, with interaction mediated via host immunity. One unexpected emergent property was an interaction between the seasonality and the immune decay rate with slower immune decay resulting in a shift of the immune response out of phase with the species against which it was produced. The model was also used to assess the potential effects of two control strategies, an anticestodal and a single species vaccine. The vaccine had greater effects on the whole community than the anticestodal because of the immune- mediated interactions. The host is also an integral part of the community as the parasite dynamics are linked with that of their host. Therefore an assessment of the parasites' impact upon host condition and fecundity was also undertaken. This revealed a variety of positive and negative associations between the parasites and their host, with potential implications for future host control strategies. This study has shown that ignoring parasite-parasite or parasite-host interactions and interactions of both the host and the parasite with the external environment, could result in a poor description of the community dynamics. Such complexities need to be considered and incorporated into theory if future control strategies for either host or parasites are to be effective.
3
Howorth, A. J. "Control of the secretory processes in the rabbit mandibular gland." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376296.
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Chamunorwa, Joseph Panashe. "Trasnmural differences in control of contraction in rabbit ventricular muscle." Thesis, University of Liverpool, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320502.
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McKillop, Ian Gordon. "The behaviour of the European wild rabbit Oryctolagus cuniculus L. at electric fences." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258341.
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Crouse, Amanda Louise. "Genetic analysis of the endangered silver rice rat (Oryzomys palustris natator) and Lower Keys marsh rabbit (Sylvilagus palustris hefneri)." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4822.
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Genetic analyses of two endangered species of mammals in the Lower Keys of
Florida (Lower Keys marsh rabbit, LKMR, Sylvilagus palustris hefneri; silver rice rat,
SRR, Oryzomys palustris natator) were performed to evaluate the genetic structure of
their populations. Mitochondrial sequence data (control region; 763 base pairs (bp),
LKMR; 788 bp, SRR) were used to explore patterns of genetic variation within and
among island populations in both species. Analysis of the SRR also included 8
polymorphic nuclear microsatellite loci (9 to 16 alleles). Phylogenetic analyses of
mitochondrial sequence data for both species revealed two main lineages corresponding
to eastern and western localities, with high levels of genetic structuring (LKMR FST =
0.982, SRR æST = 0.916). The two species differed in the level of sequence divergence
between eastern and western populations (LKMR, 19 bp; SRR 4 bp). In addition to an
overall similar pattern of genetic subdivision, populations of both species possessed low
levels of mtDNA variation (haplotypic diversity in the LKMR = 66.1%, SRR = 58.6%).
Microsatellite analyses of the SRR revealed subdivision between eastern and western
regions. Although less pronounced than the structure observed in mtDNA, the overall pattern was still apparent. Additional examination of divergence between mainland and
Lower Keys rice rats revealed a genetic division that indicated a lack of recent gene
exchange between the regions (i.e. no shared haplotypes, the presence of private alleles,
and distinctive separation in numerous analyses). Although this degree of division does
not warrant species designation, the levels and patterns of divergence, both
morphological and genetic, do suggest genetic isolation of mainland and island forms.
This fact, along with restricted gene flow between the Lower Keys and the Everglades,
suggests that the SRR is on an evolutionary trajectory separate from its mainland
counterparts and validates its identification as a separate subspecies, Oryzomys palustris
natator. Finally, the genetic division between eastern and western populations of the
SRR and LKMR suggests that populations of both species in these two regions of the
Lower Keys should be treated as separate management units, especially when
considering the enhancement of populations via translocations.
7
Laborda, Vidal Patricia. "Selection for ovulation rate in rabbits." Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/14121.
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El objetivo de esta tesis ha sido estudiar la respuesta directa a la selección por tasa de ovulación en conejo y las respuestas correlacionadas en tamaño de camada y tasas de supervivencia.
Los animales pertenecían a una línea de conejos seleccionada por tasa de ovulación durante 10 generaciones. La selección se realizó en base al valor fenotípico de la hembra, que se midió el día 12 de la segunda gestación mediante laparoscopia. Se creó una línea control a partir de la recuperación de aproximadamente 470 embriones de 50 hembras donantes de la generación base. Los embriones fueron vitrificados y almacenados en nitrógeno líquido hasta su transferencia al final del experimento de selección (generación 10 de la línea seleccionada).
Se midieron los siguientes caracteres: tamaño de camada (LS), estimada como el número total de gazapos al parto en un máximo de 5 partos; tasa de ovulación (OR), estimada como el número de cuerpos lúteos en los dos ovarios; tasa de ovulación derecha y tasa de ovulación izquierda (ROR y LOR); el número de embriones implantados totales (IE), en el lado derecho (RIE) y en el lado izquierdo (LIE); la diferencia ovulatoria (OD), definida como la diferencia entre ROR y LOR, expresada en valor absoluto; la diferencia de implantación (ID), definida como la diferencia entre RIE y LIE, expresada en valor absoluto; la supervivencia embrionaria (ES), calculada como IE/OR; la supervivencia fetal (FS), calculada como LS/IE; la supervivencia prenatal (PS), calculada como LS/OR.
Se utilizó metodología bayesiana para analizar los datos. Las estimas de las heredabilidades de OR, LS, ES, FS y PS fueron 0.16, 0.09, 0.09, 0.24 y 0.14, respectivamente. Las estimas de las correlaciones fenotípicas de OR con LS, ES, FS y PS fueron 0.09, -0.07, -0.26 and -0.28, respectivamente. Las estimas de las correlaciones genéticas de OR con LS y ES tuvieron una baja precisión, y no se pudo concretar su signo. Las estimas de las correlaciones genéticas de OR con FS y PS fueron negativas (probabilidad de ser negativa de 1.00 y 0.98, respectivamente). Las correlaciones fenotípicas y genéticas entre LS y las tasas de supervivencias fueron positivas (probabilidad de ser positivas de 1.00).Laborda Vidal, P. (2011). Selection for ovulation rate in rabbits [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/14121
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8
Calvet, Sanz Salvador. "Experimental studies on gas and dust emissions to the atmosphere in rabbit and broiler buildings." Doctoral thesis, Universitat Politècnica de València, 2010. http://hdl.handle.net/10251/8304.
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La contaminación atmosférica originada por la producción animal intensiva afecta al medio ambiente global, a la salud de las personas y al bienestar de los animales de la propia granja. Se trata de una problemática de creciente interés en países en los que, como en el caso de España, se ha investigado poco hasta el momento. Esta tesis doctoral se centra en la medición experimental de concentraciones y emisiones de gases (amoniaco, metano, óxido nitroso y dióxido de carbono) y partículas (PM10) en granjas de pollos de cebo y de conejos, principalmente en clima mediterráneo, analizando los factores que afectan a dichas emisiones. Para ello, la tesis se compone de cinco trabajos de investigación diferenciados, aunque estrechamente relacionados entre sí. En primer lugar, se estudia en detalle la metodología empleada para medir las emisiones, basado en un balance en el que las variables son la concentración de gases y el flujo de ventilación; por otra parte, se desarrolla un procedimiento para el análisis de la incertidumbre cuyo objetivo es obtener indicadores de la calidad de los resultados. En segundo lugar, se aborda la medición del flujo de ventilación en granjas comerciales mediante el desarrollo de un circuito para la adquisición de información sobre el funcionamiento de los ventiladores. Posteriormente, y en aplicación de los dos anteriores estudios, se determinan las emisiones de gases en dos granjas comerciales de conejos y una de pollos en el litoral mediterráneo español, obteniendo resultados muy útiles para la mejora del inventario nacional de emisiones. Finalmente, se ha cuantificado la influencia de la actividad de los pollos de engorde en las emisiones de partículas y de gases, y se ha evaluado la aplicabilidad de un método para la determinación indirecta de la ventilación basado en el balance de dióxido de carbono. Los resultados obtenidos en estos experimentos y en los correspondientes análisis contribuyen al conocimiento general acerca de las emisionesCalvet Sanz, S. (2008). Experimental studies on gas and dust emissions to the atmosphere in rabbit and broiler buildings [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/8304
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Delgado, Esmeralda Sofia da Costa. "Estudo da regulação da circulação ocular num modelo de olho isolado de coelho." Doctoral thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2008. http://hdl.handle.net/10400.5/461.
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Dissertação de Doutoramento em Ciências VeterináriasA circulação ocular compreende dois compartimentos: o retiniano possui receptores autonómicos e é autoregulado, enquanto que o coroideu possui inervação adrenérgica e existe controvérsia acerca da presença de autoregulação. Nesta tese criámos e optimizámos um modelo experimental de olho isolado de coelho para ajudar a clarificar os mecanismos de controlo locais da circulação ocular independentemente de outras interferências presentes num modelo in vivo. Surpreendentemente, antes da administração de qualquer fármaco, observámos respostas de vasomotricidade intrínseca em todos os modelos experimentais. Validámos o modelo utilizando fármacos adrenérgicos de efeitos conhecidos. A injecção de fenilefrina (α1-adrenérgico) desencadeou uma resposta vasoconstritora e diminuiu a frequência e aumentou a amplitude das oscilações enquanto que a prazozina (α1-bloqueador), a fentolamina (α1,2 -bloqueador) e o labetalol, (αβ-bloqueador) provocaram vasodilatação e diminuíram a intensidade das oscilações de vasomotricidade intrínseca. Analisámos as variações de pressão decorrentes da injecção intraarterial de outros neurotransmissores: a Endotelina-1, o L-NAME (antagonista do Óxido Nítrico) e o Neuropéptido Y induziram uma resposta vasoconstritora e aumento da frequência e amplitude das oscilações enquanto que a L-Arginina (precursor do Óxido Nítrico), o Péptido Vasointestinal e a amlodipina (bloqueador dos canais de cálcio) desencadearam os efeitos opostos. Estes resultados abrem novas perspectivas para a manipulação terapêutica das doenças oculares isquémicas como sejam a retinopatia diabética e o glaucoma
ABSTRACT: Ocular circulation has two compartments: the retina has autonomic receptors and is also autoregulated, while the choroid has adrenergic innervation but there is still some controversy about the presence of autoregulation. In the current investigation we developed an experimental model of isolated rabbit eye to help clarifying the local mechanisms of control of ocular circulation, independently of other interferences present in an “in vivo” model. Surprisingly, before any drug administration, we observed intrinsic vasomotricity in every animal model. We validated the model using adrenergic drugs of known effects. The injection of phenylefrine (α1-adrenergic) elicited vasoconstriction and decreased the frequency but increased the amplitude of the oscillations while prazozin (α1-blocker), phentolamine (α1,2 -blocker) and labetalol, (αβ-blocker) evoked vasodilation and a decrease in both the frequency and amplitude of the oscillations of intrinsic vasomotricity. We analysed the perfusion pressure changes following the intraarterial injection of other neurotransmitters: Endotelin-1, L-NAME (Nitric Oxide antagonist) and Neuropeptide Y elicited vasoconstrition and increased the frequency and amplitude of the oscillations while L-Arginine (Nitric Oxide precursor), Vasointestinal Peptide and amlodipine (calcium channel blocker) evoked the opposite effects. These results open new perspectives to the therapeutical handling of isquemic ocular diseases such as diabetic retinopathy and glaucoma
Trabalho realizado ao abrigo do Projecto de Investigação 71/Oftalmologia financiado pelo Centro de Investigação Interdisciplinar em Sanidade Animal da Faculdade de Medicina Veterinária de Lisboa.
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Heinrichs, Claudine. "The control of linear bone growth: auxological studies in patients with growth disorders and molecular studies in an experimental rabbit model." Doctoral thesis, Universite Libre de Bruxelles, 1996. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212312.
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Fraser, Kenneth Wayne. "Biology of the rabbit (Oryctolagus cuniculus (L.)) in Central Otago, New Zealand, with emphasis on behaviour and its relevance to poison control operations." Thesis, University of Canterbury. Department of Zoology, 1985. http://hdl.handle.net/10092/3796.
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This research arose from concern over declining success rates of rabbit poisoning operations in Central Otago. It consisted of a detailed study of behaviour in a natural population of rabbits which was subsequently poisoned. The aim was to test the hypothesis that social behaviour and the existence of neophobia could be contributing to control operation failures. Several other aspects of rabbit biology in Central Otago were investigated including population age and sex structure, growth and condition, and reproduction. Information on rabbit behaviour was obtained from intensive observation of a population of 50-100 rabbits over a period of two years. Activity budget results for the period of peak emergence (late afternoon-early evening) revealed similar patterns to those recorded previously, with some minor differences in the classification of individual behaviours. Social organisation varies seasonally and spatially, with a range of social structures present at anyone time. Heterogeneity of the habitat, in particular the patchiness of the food supply, influenced spatial and temporal features of social organisation. Reproductive efficiency and optimal use of resources appear to be important determinants of social structure; the concept of economic defendability is relevant. Activity range size and shape were extremely variable with female rabbits generally having larger ranges than males. Some relationship between activity range size and metabolic requirements and economic defendability was evident. Gross movement patterns were a product of habitat heterogeneity and the limited availability of permanent resting locations because of the unsuitability of the substrate for burrowing. Age structures of rabbit populations in Central Otago are characterised by relatively few individuals greater than 24 months old; this suggests high mortality and a rapid turnover rate. Growth and condition results reflect some measure of environmental conditions in Central Otago. Seasonal variation in fat-related condition suggests hormonal control of fat reserves rather than regulation by resource availability. The breeding season is sharply defined, a product of severe and strongly seasonal environmental conditions. Annual productivity is about 22 young per female. Evidence is presented for the existence of neophobia in Central Otago rabbit populations. Despite the genetic basis for this trait, environmental factors may influence an individual's propensity to exhibit neophobia. This may account for the considerable variation in neophobic responses among individual rabbits.
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Nekula, Vít. "Řidicí systém domácnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219665.
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The thesis is about designing a house control system which works as decentralized device. Initially, a brief market research in field of intelligent electro installation was made. On the basis of gained knowledge the whole concept of the system was designed – a control unit, a weather station and a temperature control unit. Each part communicates with each other wirelessly. A complete electronic design of circuit boards is a part of the thesis. The board were afterwards produced and assembled. Then a communication protocol and a complete implementation of all system functions were made. Next part of the thesis is a design and a programming of a web interface which is used to control the entire system. The final part of the thesis is about measuring a quality of communication between single units.
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Herbin, Catherine. "Developpement et regulation de l'oxydation hepatique des acides gras chez le lapin nouveau-ne." Paris 7, 1988. http://www.theses.fr/1988PA077073.
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Furlong, Michael John. "The impact of a generalist predator, the red fox (Vulpes vulpes), on its main prey populations." Thesis, University of Bristol, 2000. http://hdl.handle.net/1983/927e8373-6f96-4637-a525-0ca219c900e7.
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Robison, Heidi Joan. "Phonation Threshold Pressure and Phonation Threshold Flow in Rabbits Treated With Inhaled Corticosteroids Versus Controls." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/8936.
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This thesis is part of a larger series of studies being conducted by Kristine Tanner, PhD, Associate Professor in the Department of Communication Disorders at Brigham Young University (BYU). The larger project is funded by the National Institute on Deafness and Other Communication Disorders at the National Institutes of Health. This thesis primarily investigated the effects of combination inhaled corticosteroids (ICs) on aerodynamic measures of the voice. In recent years, an increase in the localized laryngeal side effects from IC treatment, including dysphonia, have been reported. This study employed a between-groups experimental design, with two groups of rabbit larynges having been exposed to either ICs or nebulized isotonic saline two times each day for eight weeks at The University of Utah. For this study, the independent variable is group condition (i.e., IC versus saline) and the dependent variables are two aerodynamic measurements made at the onset of phonation using a benchtop experimental setup, namely phonation threshold pressure (PTP; cmH2O) and phonation threshold flow (PTF; L/min). The results of this study indicate a significant difference in PTP and PTF between vocal folds treated with IC as compared to vocal folds treated with nebulized isotonic saline solution. Implications of this study suggest negative changes in the voice due to IC treatment.
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Giri, Isabelle. "Le genome du papillomavirus de lapin cottontail : de la determination de la sequence aux proprietes biologiques des proteines." Paris 7, 1988. http://www.theses.fr/1988PA077060.
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Feio, Claudine Maria Alves [UNIFESP]. "A Euterpe oleracea (açaí) modifica o metabolismo de esteróis e atenua a aterosclerose induzida experimentalmente." Universidade Federal de São Paulo (UNIFESP), 2011. http://repositorio.unifesp.br/handle/11600/8819.
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Publico-12819.pdf: 1531638 bytes, checksum: 73bb6d6fd7336127fb68327a46db002f (MD5)Introducao: Euterpe oleracea (acai) e uma fruta da regiao amazonica, cuja composicao quimica pode ser benefica para individuos com aterosclerose. Nos hipotetizamos que o consumo de Euterpe oleracea poderia reduzir o desenvolvimento da aterosclerose por uma reducao na absorcao e sintese de colesterol. Metodos: Coelhos machos Nova Zelandia foram alimentados com uma dieta enriquecida em colesterol (0.5%) por 12 semanas, quando foram aleatoriamente distribuidos para tratamento com Euterpe oleracea ou agua alem de dieta enriquecida em colesterol (0,05%) por 12 semanas adicionais. Fitosterois plasmaticos e desmosterol foram determinados por cromatografia liquida de alto desempenho e espectrometria de massa. As lesoes ateroscleroticas foram estimadas por planimetria computadorizada. Resultados: Ao sacrificio, os animais tratados com Euterpe oleracea tiveram menores niveis de colesterol total (p=0.03) e de colesterol nao-HDL (p=0.03) em comparacao aos controles. Estes animais tiveram menores areas de aterosclerose em suas aortas ((p=0.001) e menor relacao intima/media (p=0.002) em comparacao aos controles. Ao final do estudo, os valores plasmaticos de campesterol, ƒÀ-sitosterol, e desmosterol nao diferiram entre os grupos. Entretanto, os animais tratados com Euterpe oleracea mostraram menores valores para as relacoes desmosterol/campesterol (p=0.026) e desmosterol/ƒÀ-sitosterol (p=0.006) em comparacao aos controles. Conclusoes: Consumo do extrato de Euterpe oleracea marcadamente melhora o perfil lipidico e atenua a aterosclerose. Estes efeitos foram em parte relacionados a um melhor balanco entre sintese e absorcao de esterois.
Background: Euterpe oleracea (acai) is a fruit from the Amazon region, whose chemical composition may be beneficial for individuals with atherosclerosis. We hypothesized that consumption of Euterpe oleracea would reduce therosclerosis development by a decrease in cholesterol absorption and synthesis. Methods: Male New Zealand rabbits were fed a cholesterol-enriched diet (0.5%) for 12 weeks, when they were randomized to receive Euterpe oleracea extract or water plus a 0.05% cholesterol-enriched diet for additional 12 weeks. Plasma phytosterols and desmosterol were determined by ultra performance liquid chromatography and mass spectrometry. Atherosclerotic lesions were estimated by computerized planimetry. Results: At sacrifice, animals treated with Euterpe oleracea had lower levels of total cholesterol (p=0.03) and non-HDL-cholesterol (p=0.03) as compared to controls. These animals had smaller atherosclerotic plaque area in their aortas (p=0.001) and a smaller intima/media ratio (p=0.002) in comparison with controls. At the end of the study, campesterol, ƒÀ-sitosterol, and desmosterol plasma levels did not differ between groups. However, animals treated with Euterpe oleracea showed lower values for the desmosterol/campesterol (p=0.026) and desmosterol/ƒÀ-sitosterol (p=0.006) ratios as compared to controls. Conclusion: Consumption of Euterpe oleracea extract markedly improved the lipid profile and attenuated atherosclerosis. These effects were related in part to a better balance in the synthesis and absorption of sterols.
TEDE
BV UNIFESP: Teses e dissertações
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Baumgartener, Christine Carol. "CHOLINERGIC AND ADRENERGIC RESPONSES OF BRONCHIAL RINGS AND PERIPHERAL LUNG STRIPS FROM IMMUNOGLOBULIN E-PRODUCING AND CONTROL RABBITS (MUSCARINIC, AIRWAYS, PIRENZEPINE, ATROPINE, FIELD STIMULATION)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275417.
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Dias, Ricardo Augusto. "Emprego de sistemas de informação geográfica (SIG) no controle da raiva canina." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/10/10134/tde-25092001-171311/.
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Estimou-se o tamanho e a distribuição espacial da população canina domiciliada no Município de Guarulhos, Estado de São Paulo, correlacionando-os com a população humana e composição sócio-econômica. Um Sistema de Informação Geográfica (SIG) foi elaborado para avaliar a localização espacial dos postos da Campanha de Vacinação Anti-rábica Canina em Guarulhos, no ano 2000. A população total de cães, no ano 2000, foi estimada com base em uma razão entre a população humana e a população canina, de acordo com uma amostra que considerou critérios sócio-econômicos. Observou-se que esta razão não está correlacionada com nível sócio-econômico, podendo-se considerar um valor único, ou seja, 5,30 (erro padrão de 0,27), para a Zona Urbana do município. Na Zona Rural, estimou-se a razão em 8,16 (erro padrão de 1,13). Foi determinada a densidade populacional canina para os setores censitários, com base na razão entre a população humana e a população canina. Baseado em uma lista de endereços, a localização geográfica dos 160 postos fixos de vacinação foi levantada, pelo uso de um aparelho de localização global por satélite (SPG). Estes pontos foram então plotados em um mapa georreferenciado do município de Guarulhos e suas 'áreas de influência' foram estabelecidas com base em uma distância média de deslocamento dos proprietários até os postos de vacinação. A população canina foi estimada em 193886 no ano 2000. A população felina foi estimada em 44070 no mesmo ano. Confrontando-se estes números com o total de animais vacinados na Campanha de Vacinação Anti-rábica do ano 2000, estimou-se que 61,77% dos cães domiciliados e 38,31% dos gatos domiciliados foram atendidos. Observou-se, através de mapas temáticos, que a cobertura espacial dos postos de vacinação é adequada, pois atende as áreas de maior densidade populacional animal. A proporção entre os gêneros da população canina foi estimada em 1,70, ou seja, 1,70 machos para cada fêmea. A mesma proporção, para a população felina, foi estimada em 1,44.The size of supervised dog population and its distribution was estimated in Guarulhos, State of Sao Paulo, and correlated with human population and its socio-economic composition. A Geographic Information System (GIS) was built to evaluate spatial location of posts of anti-rabic vaccination campaign in Guarulhos, in the year 2,000. The total canine population in the year 2,000 was estimated by a human population:dog population ratio, obtained by a socio-economic criteria sampling. This ratio is not correlated with socio-economic levels, so that it may be considered a single value, or 5.30 (standard error in 0.27), to Guarulhos Urban Area. In Rural Area, this ratio is 8.16 (standard error in 1.13). Canine population density in censitary sectors was determinated based on human population:dog population ratio. Geographic location of 160 vaccination posts was found, based on an address list, by using a global positioning system (GPS) device. Those points were plotted in a map of Guarulhos, and its 'influence areas' were established by a mean walking distance, or the distance that a dog owner was prone to reach a vaccination post. Canine population was estimated in 193,886 for the year of 2,000. Feline population was estimated in 44,070 in the same year. Comparing these numbers with total vaccinated animals (dogs and cats) in Anti-rabic Vaccination Campaign of 2000, 61.77% of supervised dogs and 38.31% of cats were estimated to be attended. Through thematic maps, spatial coverage of vaccination posts was found to be adequate for Guarulhos, because it covers areas of high animal density. The proportion between genders of canine supervised population was estimated in 1.70, or 1.70 male for each female. The same proportion for feline supervised population, was estimated in 1.44.
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Colin, Vivas Aketzali Nallely, and Vivas Aketzali Nallely Colin. "DETERMINACIÓN DEL TIEMPO POST INOCULACIÓN PARA LA OBTENCIÓN DE CONTROLES POSITIVOS 1+ Y 4+ PARA EL DIAGNÓSTICO DE RABIA MEDIANTE LA TÉCNICA DE INOCULACIÓN EN RATÓN LACTANTE." Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/65188.
Full textAbstract:
La presencia de antígeno se evaluó con la técnica de inmunofluorescencia directa utilizando en cada experimento controles negativos y positivos como referencia (Fig.18 y 19). De acuerdo a la tabla 1 se clasificaron los resultados en: negativo o positivos considerando el grado: 1+,2+,3+ y 4+. Se tomaron micrografías de las muestras que se observan en la tabla 2. Los resultados muestran que solo hasta el 3er día se encontró intensidad débil en la fluorescencia y poca presencia de antígeno en 2 de las 3 muestras analizadas, por lo que le corresponde una clasificación de 1+. En términos generales, la intensidad y cantidad de antígeno fue directamente proporcional al incremento del tiempo del sacrificio del ratón siendo en el 5to día cuando se observó una infiltración masiva de inclusiones en toda la muestra con una alta intensidad de fluorescencia, características que corresponden a un positivo 4+.La rabia es una enfermedad que existe desde hace millones de años, afecta a mamíferos y es causada por un Lyssavirus de la familia Rhabdoviridae que provoca encefalitis aguda. No existe un tratamiento médico para la enfermedad por lo tanto una vez que aparecen los síntomas es mortal sin embargo se puede prevenir mediante la vacunación. Aunque gracias a las medidas de prevención y vacunación la rabia transmitida por perro se ha logrado controlar, en México, la rabia transmitida por animales silvestres es la principal preocupación ya que causa pérdidas económicas de millones de dólares principalmente en la industria ganadera y al sector salud por el diagnóstico, investigación de mordeduras de animales, tratamientos, indemnizaciones por pérdida de ganado, cuarentenas, vacunas, mantenimiento de los laboratorios de diagnóstico y programas de control animal.
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Enderlin, Alexandre. "Contrôle cohérent des excitations électroniques d’une boîte quantique unique." Paris 6, 2010. http://www.theses.fr/2010PA066170.
Full textAbstract:
Nous avons étudié les propriétés de cohérence d’une paire électron-trou confines dans une boîte quantique (BQ) unique. Ce travail a été réalisé sur deux types de BQs : d’une part, des BDs de GaAs sur GaAlAs obtenues par fluctuations d’épaisseur aux interfaces, et d’autre part, des BQs auto-organisées d’InAs sur GaAs. Afin d’exciter de manière résonnante la transition fondamentale de BQs, celles-ci sont insérées dans un guide d’onde unidimensionnel. La luminescence des BQs est collectée par la surface du guide d’onde, de telle façon à séparer la luminescence du laser diffusé. Tout d'abord, nous avons observé des oscillations de Rabi sur l'intensité de la micro-photoluminescence en fonction de l'aire de l'impulsion lumineuse d'excitation. Ceci démontre l'existence d'une régime de couplage fort entre une BQ unique et l'impulsion. Deuxièmement, une paire électron-trou peut être manipuler par un train de deux impulsions, dans une expérience dite de contrôle cohérent. En fonction de la différence de phase entre les deux impulsions, des interférences constructives ou destructives entrainent, respectivement, une augmentation ou une diminution de l'intensité de la luminescence de la BQ. Nous avons montré que deux impulsions π permettent de mesurer le temps de vie, T1, de l'état excité et deux impulsions π/2 sont utilisées pour mesurer le temps de cohérence, T2. Les résultats expérimentaux montrent que le temps de décohérence total, T2 (170 ps), est du même ordre de grandeur que le temps de vie T1 (200 ps) bien que le limite supérieure de 2T1 ne soit pas atteinte. Nous en concluons que la perte de cohérence est autant dû à l'émission spontanée qu'aux processus de déphasage pur.
22
Delagnes, Jean-Christophe. "CONTROLE DE LA PROPAGATION D'IMPULSIONS ULTRACOURTES. EFFETS DE DELACEMENTS LUMINEUX." Phd thesis, Université Paul Sabatier - Toulouse III, 2005. http://tel.archives-ouvertes.fr/tel-00080477.
Full textAbstract:
Cette thèse présente l'étude théorique et expérimentale du contrôledes phénomènes de propagation cohérente d'impulsions ultracourtes
dans un milieu résonant optiquement dense. Dans une première partie,
nous décrivons les phénomènes élémentaires des effets de
propagation. L'épaisseur optique caractérise l'importance de la
distorsion temporelle qui apparaît en général sur l'impulsion. A
l'image des compensateurs à prismes ou à réseaux utilisés pour
compenser la dispersion d'un milieu transparent, on montre que cette
dispersion résonante peut être compensée par l'utilisation d'un
façonneur d'impulsion haute résolution. Dans un second temps, nous
développons l'idée de contrôler par un champ fort, les propriétés
transitoires d'une autre impulsion faible et résonante qui se
propage simultanément dans le milieu. Le champ fort induit des
modifications transitoires dans le milieu, qui se répercutent et
modifient par rayonnement le champ de l'impulsion résonante qui se
propage. Dans un système à trois niveaux en échelle, des modulations
visibles sur le profil temporel, révèlent les déplacements lumineux
induits de manière non résonante sur les deux états excités. Leur
durée caractéristique est plus courte que celle de l'impulsion
initiale : il y a un enrichissement du spectre transmis. Ces
oscillations résultent du battement entre le champ incident et le
champ rayonné dont la fréquence varie sous l'effet des déplacements
lumineux. L'excitation "bichromatique" d'un système à deux niveaux,
présente deux configurations géométriques qui donnent accès à des
informations différentes. En plus des phénomènes précédents qui
apparaissent en configuration non colinéaire, les effets des
transitions non adiabatiques induites par le champ de contrôle se
manifestent également dans le cas colinéaire. Le champ faible est
alors une sonde particulièrement sensible à ces effets. Nous
étudions enfin une configuration où les deux impulsions, polarisées
orthogonalement, excitent de manière résonante un système à quatre
niveaux dégénérés deux à deux. Puisque le champ fort mélange les
états, les chemins d'émission et d'absorption du champ faible ont
des poids équivalents. Ces deux chemins interfèrent modulant ainsi
l'énergie de l'impulsion transmise. La combinaison des déplacements
lumineux et de ces interférences, permet de contrôler aussi bien le
gain que la forme temporelle de l'impulsion.
23
Enderlin, Alexandre. "Contrôle cohérent des états électroniques d'une boîte quantique unique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00530599.
Full textAbstract:
Nous avons étudié les propriétés de cohérence d'une paire électron-trou confinée dans une boîte quantique (BQ) unique. Ce travail a été réalisé sur deux types de BQs : d'une part, des BDs de GaAs sur GaAlAs obtenues par fluctuations d'épaisseur aux interfaces, et d'autre part, des BQs auto-organisées d'InAs sur GaAs. Afin d'exciter de manière résonnante la transition fondamentale de BQs, celles-ci sont insérées dans un guide d'onde unidimensionnel. La luminescence des BQs est collectée par la surface du guide d'onde, de telle façon à séparer la luminescence du laser diffusé. Tout d'abord, nous avons observé des oscillations de Rabi sur l'intensité de la micro-photoluminescence en fonction de l'aire de l'impulsion lumineuse d'excitation. Ceci démontre l'existence d'une régime de couplage fort entre une BQ unique et l'impulsion. Deuxièmement, une paire électron-trou peut être manipuler par un train de deux impulsions, dans une expérience dite de contrôle cohérent. En fonction de la différence de phase entre les deux impulsions, des interférences constructives ou destructives entrainent, respectivement, une augmentation ou une diminution de l'intensité de la luminescence de la BQ. Nous avons montré que deux impulsions π permettent de mesurer le temps de vie, T1, de l'état excité et deux impulsions π/2 sont utilisées pour mesurer le temps de cohérence, T2. Les résultats expérimentaux montrent que le temps de décohérence total, T2 (170 ps), est du même ordre de grandeur que le temps de vie T1 (200 ps) bien que le limite supérieure de 2T1 ne soit pas atteinte. Nous en concluons que la perte de cohérence est autant dû à l'émission spontanée qu'aux processus de déphasage pur.
24
Chia, Chang Yin. "Avaliação da função de um novo surfactante de origem porcina obtido da extração orgânica acoplada à adsorção em derivado de celulose." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/5/5141/tde-07102014-105037/.
Full textAbstract:
INTRODUÇÃO: O tratamento das doenças decorrentes das deficiências quantitativa ou qualitativa do surfactante pulmonar consiste na reposição exógena, porém, esta terapêutica é de alto custo devido, basicamente, à metodologia sofisticada de produção do surfactante e à necessidade de importação. Com o propósito de reduzir os custos deste tratamento, o Instituto Butantan, em São Paulo, Brasil, desenvolveu uma nova tecnologia de produção, que demanda menor custo, através da extração orgânica de macerado de pulmão de suínos acoplada à adsorção em um derivado de celulose (DEAE-celulose). MÉTODOS: Com o objetivo de testar a eficácia deste novo produto, 74 coelhos prematuros de 27 dias de gestação foram randomizados em três grupos de estudo, de acordo com o tipo de tratamento realizado: Grupo Controle (n = 28, sem tratamento), Grupo Butantan (n = 22, Surfactante Butantan 50 mg/kg) e Grupo Survanta (n = 24, Survanta® 50 mg/kg). Os animais foram submetidos à ventilação mecânica com freqüência respiratória de 60 ciclos/ minuto, pressão expiratória positiva final de zero, tempo inspiratório de 0,5 segundo e fração inspirada de oxigênio de 21%, durante 20 minutos. O volume-corrente foi ajustado manualmente em 8 ml/kg durante o período da ventilação e a pressão ventilatória (pressão inspiratória - pressão expiratória final positiva) atingida foi registrada através de um pletismógrafo a cada 5 minutos. A complacência dinâmica foi determinada pela relação entre o volume-corrente e a pressão ventilatória. Ao final da ventilação, os animais foram divididos em dois grupos, um para a realização da curva pressão-volume e o outro para o estudo histopatológico. A análise histopatológica foi realizada com a determinação do tamanho alveolar médio, através da estimativa do intercepto linear médio (Lm); e com o cálculo do índice de distorção (ID) que indica a heterogeneidade do parênquima pulmonar. RESULTADOS: O volume-corrente alvo de 8 ml/kg foi atingido nos três grupos de estudo. Quanto a pressão ventilatória, foi observado menores pressões nos animais dos grupos Survanta® e Butantan durante todo o período da ventilação em relação ao grupo Controle. Melhor complacência dinâmica foi observada, não havendo diferença significante entre os grupos Survanta® e Butantan. Em relação à curva pressão-volume, volumes pulmonares maiores foram observados nos grupos Butantan e Survanta® comparados aos do grupo Controle; houve, também, melhor estabilização dos volumes pulmonares na fase expiratória entre os animais dos grupos tratados em relação ao grupo Controle. A análise histopatológica mostrou maior quantidade de alvéolos normais e menor de alvéolos hiperdistendidos ou colapsados nos animais do grupo que recebeu o novo surfactante e o grupo Survanta. No grupo controle, além de apresentar mais alvéolos colapsados e hiperdistendidos, houve também maior ocorrência de áreas com edema alveolar e derrame de material hialino na luz alveolar em relação aos outros dois grupos. CONCLUSÕES: Baseado nos resultados acima, concluiu-se que a administração do novo surfactante, produzido a partir da extração orgânica acoplada à adsorção em derivado de celulose, uma tecnologia de menor custo desenvolvida no Brasil, leva a melhora significativa das propriedades mecânicas pulmonares e da histerese na curva pressão-volume, além de apresentar melhor aeração do parênquima pulmonar e de forma mais homogênea, em coelhos prematuros. Estes efeitos foram semelhantes aos produzidos com a administração de um surfactante disponível no mercado para o uso clínico rotineiroINTRODUCTION: Pulmonary diseases related to quantitative or qualitative surfactant deficiency are well described, mainly in neonatology. The treatment with surfactant replacement is effective although costly, due to the complexity of surfactant production and imports costs. Aiming the reduction of the cost associated with this therapy, the Butantan Institute, São Paulo, Brazil, developed a new technology based in organic extraction coupled with adsorption on a cellulose derivative, resulting in lower final cost. METHODS: In order to test the in vivo efficacy of this new product, 27 days gestation preterm rabbits were randomized after tracheostomy into 3 study groups, according to the type of treatment received: Control Group (n = 28, no treatment), Butantan Group (n = 22, Butantan surfactant, 50 mg/kg) or Survanta Group (n = 24, Survanta® 50 mg/kg). Mechanical ventilation was initiated with respiratory rate, 60 cycles/min; positive end expiratory pressure, zero and inspiratory time, 0.5 sec; FiO2, 21%. Inspiratory pressure and tidal volume was continuosly evaluated using a pletismograph, and set according to the necessary in order to ventilate with a preset target tidal volume of 8 ml/kg. Respiratory parameters were recorded each five min until the end of ventilation, after 20 min. Ventilatory pressure was defined as inspiratory pressure - positive end expiratory pressure (cmH2O); dynamic compliance (DC) was calculated as DC = {[Tidal volume (ml) / (Body weight (g)/1000)] / ventilatory pressure (cmH2O)}. After the end of ventilation period the animals were divided into two groups: the first for PV curve evaluation and the second for histopathological analysis. The histopathological analysis was performed with determination of mean alveolar size, using mean linear intercept (Lm) and the distortion index, to evaluate the heterogeneity of pulmonary parenchyma. Statistical analysis was by ANOVA ONE WAY, with Student-Newman-Keuls as post hoc test. Significance level was set at p = 0.05. RESULTS: The target tidal volume was achieved in all groups. We found lower ventilatory pressures, higher dynamic compliances and pulmonary volumes in both surfactant treated groups compared to the Control group, with no difference between them. Butantan surfactant and Survanta resulted in increased Lm and lower alveoli asymmetry, as evaluated by distortion index. CONCLUSION: We conclude that the new surfactant produced by Butantan Institute resulted in improvement of lung mechanics and histhopatological findings similar to the obtained with a clinicaly available surfactant, with no differences between them
25
Tonin, Catherine. "Manipulation cohérente de l'émission résonnante d'une boîte quantique unique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00839316.
Full textAbstract:
Le but de cette thèse a été de mettre en évidence notre capacité à utiliser des boîtes quantiques semi-conductrices comme support à la réalisation de bits quantiques, briques élémentaires de l'information quantique. Nous avons ainsi démontré la possibilité de définir un système à deux niveaux, dont l'initialisation et le contrôle est réalisable au moyen d'impulsions lumineuses picosecondes et déterminé le temps durant lequel nous étions en mesure de conserver sa cohérence. Les oscillations de Rabi entre niveau fondamental et niveau excité permettent d'initialiser le système dans une superposition cohérente pouvant être ensuite manipulée par une deuxième impulsion au cours d'expériences de contrôle cohérent. Le temps de cohérence T2 du système n'est pas seulement limité par la durée de vie radiative T1 et reste très inférieur à la valeur théorique T2= 2T1. Les différents mécanismes de décohérence entrant en jeu ont dès lors été étudiés, en particulier le rôle des phonons acoustiques, responsables d'un fort amortissement des oscillations de Rabi et d'une diminution du temps de cohérence pour une partie des boîtes quantiques étudiées. Nous avons cependant dans certains cas mis en évidence la présence de mécanismes supplémentaires, liés aux fluctuations de l'environnement électrostatique des boîtes. Par ailleurs, une étude poussée de la polarisation de la luminescence émise par ces boîtes, dont la croissance a été réalisée en régime Stranski-Krastanov, a révélé une inclinaison des états propres de la structure fine de l'exciton, ainsi qu'une modification de leur intensité d'émission, témoignant d'un fort mélange des états lourds et légers de la bande de valence
26
Dahan, Daniel. "Le mariage à clause résolutoire dans le droit rabbinique : contribution contemporaine à la crise de la conjugalité." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM1050.
Full textAbstract:
A l'heure actuelle des centaines de femmes de par le monde sont concernées par le problème des ‘agounot. Il peut aussi bien s'agir de femmes auxquelles le mari refuse la délivrance du Guett (acte de divorce religieux) que de maris disparus et dont la mort n'est pas avérée au regard du droit rabbinique. Il peut également s'agir de femmes liées par l'obligation de procéder soit au Lévirat (Yiboum) soit au « déchaussement » (‘Halitsa), lorsque leur mari est mort sans laisser de descendance. Chacun des cas évoqués a des incidences différentes, non seulement pour la femme concernée mais aussi sur le statut des enfants qu'elle serait amenée à avoir dans le cadre de sa nouvelle union. C'est le problème du mamzer, spécifique au judaïsme. Il justifie la volonté des Rabbins de trouver une solution juridique au problème des ‘agounot. C'est ce qui a poussé nombre de rabbins, à travers différents pays et époques, à instaurer des mariages à clause résolutoire afin de palier ces problèmes. Ce cas est donc d'une actualité brûlante, d'autant plus qu'il montre à quel point les Rabbins recherchent des solutions (dans les limites du droit) pour résoudre des cas qui peuvent s'avérer dramatiquesAt this time, hundreds of Jewish women are considered as ‘agunot. This is one of the most serious problems for the Jewish people in our era. This situation can be the result of either of the following circumstances: a husband who disappears and is not considered dead by rabbinical authorities, a husband who refuses to grant the get (religious bill of divorce) to his wife or a brother-in-law who does not agree to perform the religious ceremony of ‘halitsa (or yibum) with his sister-in-law, a ceremony which is necessary in case the husband died childless. If a woman concerned with one of these situations decides to remarry out of the range of Jewish law, it could have dramatic results, especially for the children resulting from this new union. They could bear the terrible statute of mamzer (child born from an incestuous or adulterous relation). For this reason, many rabbis – through times and lands – tried to find new solutions to solve this complex issue, for the benefit of both women and children. One of these consists in the enforcement of a clause, at the time of the religious wedding, allowing to annul the marriage in the future should the woman need it
27
Degert, Jérôme. "Manipulation cohérente d'atomes et de molécules diatomiques avec des impulsions mises en forme." Phd thesis, Université Paul Sabatier - Toulouse III, 2002. http://tel.archives-ouvertes.fr/tel-00288584.
Full textAbstract:
Cette thèse présente l'étude théorique et expérimentale de la manipulation cohérente de systèmes atomiques et moléculaires avec des impulsions mises en forme.Dans un premier temps, nous présentons plusieurs expériences de manipulation de transitoires cohérents dans le rubidium. Ces transitoires cohérents apparaissent lorsqu'on excite un système à deux niveaux avec une impulsion à dérive de fréquence en champ faible, et se traduisent par des oscillations dans la population de l'état excité. Pour une impulsion très étirée, nous montrons qu'un saut de phase dans le domaine spectral modifie la phase des oscillations. Puis, en nous appuyant sur une analogie avec la diffraction de Fresnel, nous concevons une impulsion à dérive de fréquence d'amplitude fortement modulée, permettant de supprimer les contributions destructives au transfert de population.
Dans une deuxième série d'expériences, nous nous intéressons aux interférences de chemins quantiques dans les transitions à deux photons induites par des impulsions à dérive de fréquence. Du fait de la grande largeur spectrale des impulsions ultracourtes, les chemins d'excitation séquentiel et direct contribuent au transfert de population dans l'état excité. Les oscillations provenant de l'interférence entre ces différents chemins d'excitation sont observées dans le sodium atomique. De plus, nous montrons qu'elles sont observables quel que soit le signe de la dérive de fréquence.
D'un point de vue théorique, nous étudions le contrôle de la prédissociation d'une molécule diatomique modèle : NaI. La prédissociation conduit à l'observation d'interférences d'ondes de matière dans la distribution des fragments. Nous montrons dans un premier temps qu'il est possible d'observer ces interférences en sondant la molécule avec une impulsion judicieusement choisie. Puis, en utilisant une séquence d'impulsions de contrôle induisant une transition entre deux niveaux électroniques de la molécule, nous mettons en évidence la possibilité de manipuler la distribution énergétique des fragments.
28
Lee, Min-young. "Flavin-containing monooxygenase, tissue specific regulation in rabbit." Thesis, 1991. http://hdl.handle.net/1957/36055.
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29
Berg, Sebastian Stephan. "Characterization and Control of Wave Propagation in the Heart." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E607-5.
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30
Barker, Kimberly Lynn. "A technique for the study of factors influencing sodium excretion in the rabbit and its use in examining the role of cephalic sodium concentration in the control of renal sodium excretion." Thesis, 1994. http://hdl.handle.net/2429/5171.
Full textAbstract:
The regulation of overall body fluid balance as well as fluid sodium concentration
and osmolality involves a complex and interrelated sequence of similar receptor and
effector mechanisms. In a recent study in conscious dogs, intracarotid infusions of
hypertonic saline were performed concurrent with a jugular vein infusion of water at a
rate such that only the areas of the brain supplied by the carotid arteries experienced
an increase in plasma sodium concentration (Enimeluth et al., 1992). The results of
these infusions were then compared to the effects of an identical salt and water load
infused as isotonic saline at the same rate into the carotid arteries and jugular vein. It
was concluded from these studies that a mechanism regulating sodium excretion in the
distribution of the carotid arteries exists in the conscious dog, that the efferent pathway
of this mechanism likely involves the release of urodilatin (a natriuretic peptide), and
that this occurs in response to changes in osmolality smaller than those required to
stimulate the release of vasopressin. In order to further examine these conclusions, we
used similar intracarotid infusions of hypertonic and isotonic saline in an anaesthetized
rabbit preparation. The preparation used in these experiments was developed so that
renal perfusion pressure could be controlled without interrupting renal blood flow at any
time during the surgical procedure. This preparation was examined with respect to the
state of hydration of the animals, renal function and renal nerve function,, all of which
were determined to be normal. Results of experiments done using this preparation do
not support the concept of a specific mechanism regulating sodium excretion in the
distribution of the carotid arteries that acts independently of renal perfusion pressure.
The intracarotid infusion of hypertonic saline did not cause a greater increase in sodium
excretion or a greater decrease in renal vascular resistance than the intracarotid infusion
of isotonic saline. Immunoreactive atrial natriuretic peptides do not appear to play a
role in mediating sodium excretion in this study and, the release of vasopressin and an
increase in sodium excretion appeared to occur in response to the same degree of
osmotic change.
31
Weichert, Gabriele Elizabeth. "Neural and hormonal control of blood pressure and vascular conductance during hemorrhage in hypertensive rabbits." Thesis, 1995. http://hdl.handle.net/2429/7498.
Full textAbstract:
The cardiovascular response to hemorrhage has been well characterized in conscious normotensive rabbits. When the autonomic nervous system is intact, baroreflex mechanisms cause peripheral vasoconstriction and tachycardia, thereby maintaining blood pressure. When the autonomic nervous system is blocked, the vasoconstrictor hormones vasopressin (AVP) and angiotensin II (ANG Il) are released early during hemorrhage, and have significant effects on peripheral vascular tone and maintenance of blood pressure. In hypertension, the reflex control of blood pressure in response to hemorrhage is not well understood. It was the goal of the experiments performed in this thesis to characterize the control of blood pressure and vascular conductance during hemorrhage in conscious renal wrap hypertensive rabbits. In
particular, direct blood flow measurements allowed the control of hindlimb, mesenteric
and renal vascular conductance to be characterized. In addition, a morphological
analysis of hindlimb, mesenteric and renal blood vessels from renal wrap hypertensive rabbits was performed in order to further understand functional alterations to the vasculature in this hypertensive model.
During hemorrhage, renal wrap hypertensive rabbits had an impaired ability to
control blood pressure. When the autonomic nervous system was intact, this was
associated with an impaired ability to control heart rate and hindlimb conductance.
When the autonomic nervous system was pharmacologically blocked, the impaired
ability to control blood pressure was associated with an impairement in hormonally
mediated (AVP and ANG II) control of hindlimb vascular conductance. There was no evidence to suggest that neural or hormonal control of renal and mesenteric vascular conductance was impaired in the hypertensive rabbits during hemorrhage. Morphological analysis of hypertensive blood vessels showed that the
hindlimb, renal and mesenteric blood vessels had an increased wall-to-lumen ratio
indicative of non-specific vascular hyper-responsiveness. The impaired ability of the hypertensive rabbits to control blood pressure during hemorrhage was associated with an impaired ability to control the hindlimb, but not the mesenteric and renal vascular beds. These findings suggest that, in renal wrap hypertensive rabbits, there is either a differential control of sympathetic nerve activity or that there is a differential degree of vascular reactivity to these individual vascular beds.