Journal of Comparative Physiology B最新文献_第9页

A ‘slow pace of life’ in Australian old-endemic passerine birds is not accompanied by low basal metabolic rates 澳大利亚古老的地方性雀形目鸟类的“慢节奏生活”并不伴随着低基础代谢率

Journal of Comparative Physiology B Pub Date : 2016-02-13 DOI: 10.1007/s00360-016-0964-6

C. Bech, M. Chappell, L. Astheimer, Gustavo A. Londoño, W. Buttemer

引用次数: 22

Characterization of melatonin synthesis in the gastrointestinal tract of rainbow trout (Oncorhynchus mykiss): distribution, relation with serotonin, daily rhythms and photoperiod regulation 虹鳟鱼胃肠道褪黑素合成的特征:分布、与血清素、日常节律和光周期调节的关系

Journal of Comparative Physiology B Pub Date : 2016-02-12 DOI: 10.1007/s00360-016-0966-4

José L. Muñoz-Pérez, M. A. López-Patiño, R. Álvarez‐Otero, M. Gesto, J. Soengas, J. Míguez

引用次数: 41

The role of DNA methylation during anoxia tolerance in a freshwater turtle (Trachemys scripta elegans) 脱氧核糖核酸甲基化在淡水龟缺氧耐受中的作用

Journal of Comparative Physiology B Pub Date : 2016-02-03 DOI: 10.1007/s00360-016-0960-x

Sanoji Wijenayake, K. Storey

引用次数: 27

Female reproductive activity and its endocrine correlates in the African lesser bushbaby, Galago moholi. 非洲小矮羚的雌性生殖活动及其内分泌相关。

Journal of Comparative Physiology B Pub Date : 2016-02-01 Epub Date: 2015-12-09 DOI: 10.1007/s00360-015-0947-z

Juan Scheun, Julia Nowack, Nigel C Bennett, Andre Ganswindt

{"title":"Female reproductive activity and its endocrine correlates in the African lesser bushbaby, Galago moholi.","authors":"Juan Scheun, Julia Nowack, Nigel C Bennett, Andre Ganswindt","doi":"10.1007/s00360-015-0947-z","DOIUrl":"10.1007/s00360-015-0947-z","url":null,"abstract":"Steroid hormones play an important role in female reproductive physiology and behaviour and are often used to monitor important female reproductive events. However, such studies are often attempted on captive populations alone, delivering limited data. One such example is the African lesser bushbaby, Galago moholi, for which contradicting observational data exist between captive and free-ranging populations, while hormonal analyses have only been obtained from a single captive population. To extend and rectify the limited information, we monitored faecal progestagen and oestrogen metabolite levels across various important life history stages of both captive and free-ranging G. moholi. We additionally recorded changes in vaginal state as well as the occurrence of reproductive and aggressive behaviour throughout the study. Data from our captive population revealed an ovarian cycle length of 33.44 ± 0.59 days (mean ± SD), with follicular and luteal phases of 14.2 ± 1.0 and 19.1 ± 1.5 days, respectively, and an average pregnancy length of 128 ± 3.3 days. The initiation of female reproductive activity was closely linked to an oestrus-related increase in faecal oestrogen metabolite levels. Four of the seven captive females monitored in our study conceived during the May mating period, with one additional female fertilised in September, supporting the idea that the September mating period functions as a back-up for female G. moholi. Identified benchmark faecal progestagen metabolite levels (non-pregnant: >1 µg/g dry weight (DW), pregnant: >9 µg/g DW) should help researchers to determine pregnancy status of randomly wild-caught females in even a cross-sectional study setup.","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"40 1","pages":"255-64"},"PeriodicalIF":0.0,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83735391","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: 0

Taurine depresses cardiac contractility and enhances systemic heart glucose utilization in the cuttlefish, Sepia officinalis. 牛磺酸抑制心脏收缩力和提高全身心脏葡萄糖的利用墨鱼。

Journal of Comparative Physiology B Pub Date : 2016-02-01 Epub Date: 2015-12-07 DOI: 10.1007/s00360-015-0946-0

Tyson J MacCormack, N I Callaghan, A V Sykes, W R Driedzic

{"title":"Taurine depresses cardiac contractility and enhances systemic heart glucose utilization in the cuttlefish, Sepia officinalis.","authors":"Tyson J MacCormack, N I Callaghan, A V Sykes, W R Driedzic","doi":"10.1007/s00360-015-0946-0","DOIUrl":"10.1007/s00360-015-0946-0","url":null,"abstract":"Taurine is the most abundant amino acid in the blood of the cuttlefish, Sepia officinalis, where levels can exceed 200 mmol L(-1). In mammals, intracellular taurine modulates cardiac Ca(2+) handling and carbohydrate metabolism at much lower concentrations but it is not clear if it exerts similar actions in cephalopods. Blood Ca(2+) levels are high in cephalopods and we hypothesized that taurine would depress cardiac Ca(2+) flux and modulate contractility in systemic and branchial hearts of cuttlefish. Heart performance was assessed with an in situ perfused systemic heart preparation and contractility was evaluated using isometrically contracting systemic and branchial heart muscle rings. Stroke volume, cardiac output, and Ca(2+) sensitivity were significantly lower in systemic hearts perfused with supplemental taurine (100 mmol L(-1)) than in controls. In muscle ring preparations, taurine impaired relaxation at high contraction frequencies, an effect abolished by supra-physiological Ca(2+) levels. Taurine did not affect oxygen consumption in non-contracting systemic heart muscle, but extracellular glucose utilization was twice that of control preparations. Collectively, our results suggest that extracellular taurine depresses cardiac Ca(2+) flux and potentiates glucose utilization in cuttlefish. Variations in taurine levels may represent an important mechanism for regulating cardiovascular function and metabolism in cephalopods.","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"73 1","pages":"215-27"},"PeriodicalIF":0.0,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75672863","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: 0

Involvement of the crustacean hyperglycemic hormone (CHH) in the physiological compensation of the freshwater crayfish Cherax quadricarinatus to low temperature and high salinity stress. 甲壳类高血糖激素（CHH）参与淡水小龙虾对低温高盐胁迫的生理补偿。

Journal of Comparative Physiology B Pub Date : 2016-02-01 Epub Date: 2015-12-12 DOI: 10.1007/s00360-015-0954-0

Natalia C Prymaczok, Valeria M Pasqualino, Verónica E Viau, Enrique M Rodríguez, Daniel A Medesani

{"title":"Involvement of the crustacean hyperglycemic hormone (CHH) in the physiological compensation of the freshwater crayfish Cherax quadricarinatus to low temperature and high salinity stress.","authors":"Natalia C Prymaczok, Valeria M Pasqualino, Verónica E Viau, Enrique M Rodríguez, Daniel A Medesani","doi":"10.1007/s00360-015-0954-0","DOIUrl":"10.1007/s00360-015-0954-0","url":null,"abstract":"This study was aimed at determining the role of the crustacean hyperglycemic hormone (CHH) in the physiological compensation to both saline and thermal stress, in the freshwater crayfish Cherax quadricarinatus. By determining the expression of the CHH gene in the eyestalk of juvenile crayfish, we found that maximal induction of CHH was induced at high salinity (10 g/L) and low temperature (20 °C). In order to investigate the role of CHH in the physiological compensation to such stressful conditions, recombinant CHH was supplied to stressed animals. CHH-injected crayfish showed increased hemolymphatic levels of glucose, in accordance with a significant utilization of glycogen reserves from the hepatopancreas. Furthermore, CHH administration allowed stressed animals to regulate hemolymphatic sodium and potassium at more constant levels than controls. Taken together, these results suggest a relevant role of CHH in increasing the energy available intended for processes involved in the physiological compensation of C. quadricarinatus to both saline and thermal stress.","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"1 1","pages":"181-91"},"PeriodicalIF":0.0,"publicationDate":"2016-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90421852","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: 0

Food intake inhibition in rainbow trout induced by activation of serotonin 5-HT2C receptors is associated with increases in POMC, CART and CRF mRNA abundance in hypothalamus 5-羟色胺5-HT2C受体激活诱导的虹鳟鱼食物摄入抑制与下丘脑POMC、CART和CRF mRNA丰度的增加有关

Journal of Comparative Physiology B Pub Date : 2016-01-29 DOI: 10.1007/s00360-016-0961-9

J. Pérez-Maceira, C. Otero-Rodiño, M. Mancebo, J. Soengas, M. Aldegunde

引用次数: 19

An atypical distribution of lactate dehydrogenase isoenzymes in the hooded seal (Cystophora cristata) brain may reflect a biochemical adaptation to diving 冠海豹(Cystophora cristata)大脑中乳酸脱氢酶同工酶的非典型分布可能反映了对潜水的生化适应

Journal of Comparative Physiology B Pub Date : 2016-01-28 DOI: 10.1007/s00360-015-0956-y

M. L. M. Hoff, Andrej Fabrizius, L. Folkow, T. Burmester

引用次数: 14

Molecular, behavioral, and performance responses of juvenile largemouth bass acclimated to an elevated carbon dioxide environment 大口黑鲈幼鱼适应高二氧化碳环境的分子、行为和性能反应

Journal of Comparative Physiology B Pub Date : 2016-01-12 DOI: 10.1007/s00360-016-0958-4

C. Dennis, S. Adhikari, Adam W. Wright, C. Suski

引用次数: 15

The effects of acute cold exposure on morphology and gene expression in the heart of neonatal chicks 急性低温暴露对雏鸡心脏形态和基因表达的影响

Journal of Comparative Physiology B Pub Date : 2016-01-05 DOI: 10.1007/s00360-015-0957-x

T. Matsubara, Saki Shimamoto, D. Ijiri, A. Ohtsuka, Y. Kanai, M. Hirabayashi

引用次数: 3