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Mate choice in reed buntings (Emberiza schoeniclus)Buchanan, Graeme Murray January 2001 (has links)
No description available.
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Comparison of cecal colonization of Salmonella enterica serotype Typhimurium in white leghorn chicks and Salmonella-resistant miceSivula, Christine Patricia 15 May 2009 (has links)
Salmonellosis is one of the most important bacterial food borne illnesses
worldwide. Among the many Salmonella serotypes, Typhimurium is the most
commonly implicated serotype in human disease in the United States. A major source of
infection for humans is consumption of chicken or egg products that have been
contaminated with S. Typhimurium. The breadth of knowledge regarding colonization
and persistence factors in the chicken is small when compared to our knowledge of
factors that are important for these processes in other species used in Salmonella
research, such as cattle and mice. Defining the factors important for these processes in
the chick is the first step in decreasing the transmission of Salmonella between animal
and human hosts.
In this work, we developed a chicken model to identify and study intestinal
colonization and persistence factors of Salmonella enterica serovar Typhimurium. We
studied the degree of enteric and systemic colonization of wild type S. Typhimurium
ATCC14028, one of the most widely studied Typhimurium isolates, in White Leghorn chicks and in Salmonella-resistant CBA/J mice during infection. Furthermore, we
determined the distribution of wild type S. Typhimurium and a SPI-1 mutant (invA)
during competitive infection in the cecum of 1-week-old chicks and 8-week-old mice.
Cell associated, intracellular and luminal distributions of these strains in the cecum were
analyzed as total counts in each compartment and also as a competitive index.
Localization of S. Typhimurium ATCC14028 and the role of SPI-1 in colonization are
well studied in murine models of infection, but comparative infection in chicks with the
same strain has not been undertaken previously.
We show that the cecal contents are the major site for recovery of S.
Typhimurium in the cecum of 1-week-old chicks and Salmonella-resistant mice. We
also show that while SPI-1 is important for successful infection in the murine model, it is
important only for cell association in the cecum of 1-week-old chicks. Finally, we found
that in chicks infected at 1 week of age, bacterial counts in the feces do not reflect those
seen in the cecum as they do in mice.
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The binding property and function of melatonin receptor in peripheral tissues-chick embryonic vessels and young rat leydig cellsWang, Xiaofei, January 2001 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2001. / Includes bibliographical references (leaves 93-120).
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Molecular characterizations of chicken and zebrafish prostanoid receptors and their implications on evolution of vertebrate prostanoidreceptor familyKwok, Ho-yan, Amy., 郭可茵. January 2011 (has links)
Prostanoid receptors (PG-Rs: prostaglandin D, E, F, prostacyclin and
thromboxane receptors (DP, EP1-4, FP, IP and TP)) are known to mediate a diverse
range of biological responses, such as cardiovascular homeostasis, nociception and
reproduction, via binding to their respective ligands belonging to the five classes of
prostanoids (PGs: class D, E, F, I and thromboxane). The majority of these findings
were reported in mammals, and despite suggestive evidence provided by previous
pharmacological and physiological studies in non-mammalian vertebrates,
investigations on the mechanisms behind actions of PGs were impeded by the limited
information on their receptors.
In the present study, the full-length cDNAs of chicken (c-) and zebrafish
(z-) prostanoid receptors – cEP3, cFPs, zEP1s and zFP – were identified from
respective adult ovaries and their tissue distribution examined by RT-PCR. A novel
middle-truncated splice variant, cFPb, which lacks 107 amino acids between
transmembrane domains 4 and 6 but otherwise identical to cFPa was first identified.
Three isoforms of zEP1 – zEP1a, zEP1b, zEP1c – were found, which might have subfunctionalized
in their ligand binding and G protein coupling specificity, in addition to
differential tissue distribution. Using various luciferase reporter systems (pGL3-CRE,
pGL-NFAT-RE, pGL4-SRE), all the cloned receptors, except cFPb, were shown to
potentially couple to intracellular cAMP, Ca2+, and/or MAPK signaling pathways.
Owing to the proposed roles of PGs and its potential regulation by and/or
on EGFR ligands and gonadotropins in mammals and chicken, genes involved in
regulation of PG functions at various levels, including biosynthesis (COX1, COX2,
mPGES1, mPGES2 and cPGES), availability (PGT) and signaling (cEPs and cFPs),
were also characterized in granulosa cells during hen follicular development.
Lastly, using our experimental data and systematic sequence retrieval
from available databases, the PG receptor cascades from representative vertebrate
species were pooled and analysed using phylogenetic analyses and synteny studies.
Three putative clusters (IP-like, EP4-like and EP1-like cluster) were found in lamprey
genome; meanwhile, only one PG-R-like cluster was identified from the
Cephalochordate lancelet (amphioxus) genome. This concurs with the 1-2-4 rule
proposed in first round/second round (1R/2R) whole genome duplication in which the
missing lamprey cluster was presumably lost secondarily. With support from
conserved orthologs-localization, the four PG-R paralogs (proto-EP4, proto-IP/EP2/DP,
proto-TP/FP/EP1 & putative proto-EP3 genes) in the ancestral vertebrates might have
further diversified via either localized- (e.g. EP2 and DP) or chromosomal segmental
duplication (e.g. EP1, FP and TP) which resulted in the present array of vertebrate PGRs.
Additional paralogs (e.g. EP1 and EP4) were identified from fishes, by which
molecular dating coincide with and hint of their origins whence the ancient fishspecific
whole genome duplication (3R) occurred ~350 million years ago.
The present study offers the first glimpse and a better understanding of the
roles of the PG-Rs and presents a higher resolution to the evolutionary history of each
PG-R family member, consolidating that particular care has to be taken when studying
non-mammalian PG-R functions in which some members are absent or present in
multiples and propel the investigation of adaptational changes in the coding sequence
during evolution of vertebrate PG-Rs. / published_or_final_version / Biological Sciences / Doctoral / Doctor of Philosophy
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Vitamin deficiencies and enzymatic activities in the nutrition and metabolism of chicksVoll, Connie Kay, 1945- January 1977 (has links)
No description available.
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Sex-steroid-sensitive stromal cells in the chick oviduct and the bursa of Fabricius estrogen-induced and sexual maturation-associated progesterone receptor expression /Ylikomi, Timo. January 1987 (has links)
Thesis (doctoral)--University of Tampere, 1987. / Includes bibliographical references (p. 42-56).
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Arcuate patterning as a central feature of ventral midbrain development during early embryogenesis /Sanders, Timothy Andrew. January 2001 (has links)
Thesis (Ph. D.)--University of Chicago, Committee on Neurobioloy, March 2001. / Includes bibliographical references. Also available on the Internet.
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Histological and biochemical comparisons of selenium deficient and low protein diets in SCWL chicks /Ort, Jon Frederick January 1979 (has links)
No description available.
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A study of the factors involved in the selection of chick broodersSwink, Earl Thomas 08 June 2010 (has links)
The results secured from the series of tests appear to be conclusive enough to be used as a basis for certain recommendations. / Master of Science
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The effects of metoserpate hypochloride on the neonatal approach behavior of domestic chicksRoehling, Arthur Nelson January 1974 (has links)
An attempt was made to study the effects of a tranquilizer (metoserpate hydrochloride), specifically designed for poultry, on the neonatal approach response of domestic chicks. Acquisition of this response was accomplished in a straight alley on birds ranging in age from 24 to 120 hours old. Testing of this response was done when all birds were 144 hours old under a no-drug condition. At 168 hours of age all subjects were subjected to extinction procedures. The strength of the response was measured in terms of latency to start as well as time spent traversing the alley. Resistance to extinction was measured in terms of the latencies mentioned above as well as number of trials to extinction. The results of the present study show a peak in imprinting susceptibility between 72 and 96 hours after hatching. The tranquilizer had a traditional interference effect except for those birds exposed on Day 3 while the injection control procedure had an enhancement effect on birds treated on Days 4 and 5. In addition, there were no differences observed during extinction between groups. / Master of Science
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