The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry最新文献

Chloride-ATPase dephosphorylation in Aplysia gut. 羊肠氯- atp酶的去磷酸化。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2002-06-15 DOI: 10.1002/JEZ.10098

G. Gerencser, Jianliang Zhang

引用次数: 1

Maternally derived yolk hormones vary in follicles of the painted turtle, Chrysemys picta. 绘龟卵泡中母源卵黄激素的变化。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2002-06-15 DOI: 10.1002/JEZ.10094

R. Bowden, M. Ewert, Steven Freedberg, C. Nelson

{"title":"Maternally derived yolk hormones vary in follicles of the painted turtle, Chrysemys picta.","authors":"R. Bowden, M. Ewert, Steven Freedberg, C. Nelson","doi":"10.1002/JEZ.10094","DOIUrl":"https://doi.org/10.1002/JEZ.10094","url":null,"abstract":"The transfer of hormones from a female to her offspring is known to occur in egg laying vertebrates, and the potential for these early, maternally derived hormones to influence sex determination in reptiles with temperature-dependent sex determination is intriguing. In the present study, we examine variation in the concentrations of progesterone, testosterone, and estradiol among three follicle size classes within a female painted turtle (Chrysemys picta) and among females across four periods that span the pre- to post-nesting season. Females were collected, and both follicles and shelled eggs (when present) were harvested for hormone analysis. Progesterone levels did not vary seasonally. However, the concentration of progesterone did vary among and within follicle classes, and was primarily dependent upon ovulatory state: Recently ovulated follicles (as yolks within shelled eggs) contained significantly more progesterone than unovulated follicles. Concentrations of testosterone were low and did not vary either among size classes or across the season. Estradiol levels decreased with increasing follicle size and were higher later in the nesting season. Thus, hormone concentrations varied among follicle sizes and states but in patterns that differed among hormones. This variation has the potential to influence sex determination.","PeriodicalId":77637,"journal":{"name":"The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry","volume":"27 1","pages":"67-72"},"PeriodicalIF":0.0,"publicationDate":"2002-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83431800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 30

Acceleration of Ambystoma tigrinum metamorphosis by corticotropin-releasing hormone. 促肾上腺皮质激素释放激素对虎斑痣变态的加速作用。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2002-06-15 DOI: 10.1002/JEZ.10115

G. Boorse, R. Denver

{"title":"Acceleration of Ambystoma tigrinum metamorphosis by corticotropin-releasing hormone.","authors":"G. Boorse, R. Denver","doi":"10.1002/JEZ.10115","DOIUrl":"https://doi.org/10.1002/JEZ.10115","url":null,"abstract":"Previous work of others and ours has shown that corticotropin-releasing hormone (CRH) is a positive stimulus for thyroid and interrenal hormone secretion in amphibian larvae and that activation of CRH neurons may mediate environmental effects on the timing of metamorphosis. These studies have investigated CRH actions in anurans (frogs and toads), whereas there is currently no information regarding the actions of CRH on metamorphosis of urodeles (salamanders and newts). We tested the hypothesis that CRH can accelerate metamorphosis of tiger salamander (Ambystoma tigrinum) larvae. We injected tiger salamander larvae with ovine CRH (oCRH; 1 microg/day; i.p.) and monitored effects on metamorphosis by measuring the rate of gill resorption. oCRH-injected larvae completed metamorphosis earlier than saline-injected larvae. There was no significant difference between uninjected and saline-injected larvae. Mean time to reach 50% reduction in initial gill length was 6.9 days for oCRH-injected animals, 11.9 days for saline-injected animals, and 14.1 days for uninjected controls. At the conclusion of the experiment (day 15), all oCRH-injected animals had completed metamorphosis, whereas by day 15, only 50% of saline-injected animals and 33% of uninjected animals had metamorphosed. Our results show that exogenous oCRH can accelerate metamorphosis in urodele larvae as it does in anurans. These findings suggest that the neuroendocrine mechanisms controlling metamorphosis are evolutionarily conserved across amphibian taxa.","PeriodicalId":77637,"journal":{"name":"The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry","volume":"383 1","pages":"94-8"},"PeriodicalIF":0.0,"publicationDate":"2002-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80718642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 64

Influence of simulated microgravity on avian primordial germ cell migration and reproductive capacity. 模拟微重力对鸟类原始生殖细胞迁移和繁殖能力的影响。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2002-06-01 DOI: 10.1002/JEZ.10088

Zandong Li, Yonghong Song, Yuzhong Ma, Hua Wei, Chun-Hsu Liu, Jinsong Huang, Ning Wang, J. Sha, Fujiro Sakurai

引用次数: 7

Molecular sexing of monomorphic endangered Ara birds. 濒危单态Ara鸟的分子性别分析。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2002-06-01 DOI: 10.1002/JEZ.10070

L. Bermúdez-Humarán, A. García-García, C. Leal-Garza, V. Riojas-Valdés, G. Jaramillo‐Rangel, R. Montes-de-Oca-Luna

引用次数: 26

Costs of anorexia during pregnancy in a viviparous snake (Vipera aspis). 胎生蛇(Vipera aspis)怀孕期间厌食症的成本。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2002-04-01 DOI: 10.1002/JEZ.10065

O. Lourdais, X. Bonnet, P. Doughty

{"title":"Costs of anorexia during pregnancy in a viviparous snake (Vipera aspis).","authors":"O. Lourdais, X. Bonnet, P. Doughty","doi":"10.1002/JEZ.10065","DOIUrl":"https://doi.org/10.1002/JEZ.10065","url":null,"abstract":"Spontaneous anorexia has been documented in various animal species and is usually associated with activities competing with food intake. In natural conditions, most female aspic vipers (Vipera aspis) stop feeding during the two months of pregnancy. We carried out a simple experiment on 40 pregnant females to determine whether anorexia was obligatory or facultative, and to investigate the energetic consequence of fasting on post-partum body condition and litter traits. Three diet treatments were applied during gestation: no food, one feeding occasion, and two feeding occasions. Twelve nonpregnant, unfed females were used as a control group. Most gravid females accepted captive mice during gestation, suggesting that anorexia reported in the field was a side effect of the tremendous changes in activity pattern associated with pregnancy. Mass loss was high for unfed reproductive females, indicating high energy expenditure associated with embryo maintenance. Prey consumption allowed compensation for metabolic expenditure and enhanced post-partum female body condition, but had no effects on litter characteristics. The magnitude of the metabolic expenditure during gestation appeared to be independent of fecundity.","PeriodicalId":77637,"journal":{"name":"The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry","volume":"22 1","pages":"487-93"},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86507796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 84

Oviducal sperm storage in turkeys: spatial distribution of sperm within the uterovaginal junction sperm-storage tubules. 火鸡的输卵管精子储存:子宫阴道交界处精子储存管内精子的空间分布。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2002-02-01 DOI: 10.1002/JEZ.1156

M. Bakst, B. Vinyard

引用次数: 10

The evolution of genome size: what can be learned from anuran development? 基因组大小的进化:我们能从动物的发展中学到什么?

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2001-12-15 DOI: 10.1002/JEZ.1135

A. Chipman, O. Khaner, A. Haas, E. Tchernov

{"title":"The evolution of genome size: what can be learned from anuran development?","authors":"A. Chipman, O. Khaner, A. Haas, E. Tchernov","doi":"10.1002/JEZ.1135","DOIUrl":"https://doi.org/10.1002/JEZ.1135","url":null,"abstract":"Differences in nuclear DNA content in vertebrates have been shown to be correlated with cell size, cell division rate, and embryonic developmental rate. We compare seven species of anuran amphibians with a three-fold range of genome sizes. Parameters examined include the number and density of cells in a number of embryonic structures, and the change in cell number in the CNS during development. We show that genome size is correlated with cell proliferation rate and with developmental rate at different stages of embryonic development, but that the correlation between genome size and cell size is only evident at later stages. We discuss the evolution of genome size in amphibians. Our discussion takes into account data that reportedly support two conflicting hypotheses: the \"skeletal DNA\" hypothesis, which claims a selective role for differences in genome size, and the \"junk DNA\" hypothesis, which claims that differences in genome size are a random result of the accumulation of noncoding DNA sequences. We show that these supposedly conflicting hypotheses can be integrated into a more complex and inclusive model for the evolution of genome size.","PeriodicalId":77637,"journal":{"name":"The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry","volume":"109 1","pages":"365-74"},"PeriodicalIF":0.0,"publicationDate":"2001-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72984168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 30

A molecular phylogenetic study of ecological diversification in the Australian lizard genus Ctenophorus. 澳大利亚蛇蜥属生态多样化的分子系统发育研究。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2001-12-15 DOI: 10.1002/JEZ.1133

J. Melville, J. Schulte, A. Larson

{"title":"A molecular phylogenetic study of ecological diversification in the Australian lizard genus Ctenophorus.","authors":"J. Melville, J. Schulte, A. Larson","doi":"10.1002/JEZ.1133","DOIUrl":"https://doi.org/10.1002/JEZ.1133","url":null,"abstract":"We present phylogenetic analyses of the lizard genus Ctenophorus using 1,639 aligned positions of mitochondrial DNA sequences containing 799 parsimony-informative characters for samples of 22 species of Ctenophorus and 12 additional Australian agamid genera. Sequences from three protein-coding genes (ND1, ND2, and COI) and eight intervening tRNA genes are examined using both parsimony and maximum-likelihood analyses. Species of Ctenophorus form a monophyletic group with Rankinia adelaidensis, which we suggest placing in Ctenophorus. Ecological differentiation among species of Ctenophorus is most evident in the kinds of habitats used for shelter. Phylogenetic analyses suggest that the ancestral condition is to use burrows for shelter, and that habits of sheltering in rocks and shrubs/hummock grasses represent separately derived conditions. Ctenophorus appears to have undergone extensive cladogenesis approximately 10-12 million years ago, with all three major ecological modes being established at that time.","PeriodicalId":77637,"journal":{"name":"The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry","volume":"19 1","pages":"339-53"},"PeriodicalIF":0.0,"publicationDate":"2001-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73565710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 72

What is the promise of developmental evolution? Part II: A causal explanation of evolutionary innovations may be impossible. 发育进化的前景是什么?第二部分:对进化创新的因果解释可能是不可能的。

The Journal of experimental zoology. Supplement : published under auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry Pub Date : 2001-12-15 DOI: 10.1002/JEZ.1130

Günter P. Wagner

引用次数: 46