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Assessing population density is crucial for studying the ecology and evolutionary biology of species as well as for conservation purposes. Here we used point count methods to infer population density in a single-island endemic passerine bird, the Réunion Grey White-eye Zosterops borbonicus, that displays striking evidence of differentiation at a small spatial scale. Population density was estimated at 5.17 birds ha?1 (CL 4.85–5.50), a value somewhat higher than previously believed. This estimation provides the first detailed estimation of bird population density in the vulnerable summit ecosystems of Réunion and will possibly allow a better understanding of the evolutionary causes of this plumage colour variation. 相似文献
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Targeted redox inhibition of protein phosphatase 1 by Nox4 regulates eIF2α‐mediated stress signaling 下载免费PDF全文
Celio XC Santos Anne D Hafstad Matteo Beretta Min Zhang Chris Molenaar Jola Kopec Dina Fotinou Thomas V Murray Andrew M Cobb Daniel Martin Maira Zeh Silva Narayana Anilkumar Katrin Schröder Catherine M Shanahan Alison C Brewer Ralf P Brandes Eric Blanc Maddy Parsons Vsevelod Belousov Richard Cammack Robert C Hider Roberto A Steiner Ajay M Shah 《The EMBO journal》2016,35(3):319-334
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Abrevaya XC Sacco N Mauas PJ Cortón E 《Extremophiles : life under extreme conditions》2011,15(6):633-642
In this work, two archaea microorganisms (Haloferax volcanii and Natrialba magadii) used as biocatalyst at a microbial fuel cell (MFC) anode were evaluated. Both archaea are able to grow at high salt concentrations.
By increasing the media conductivity, the internal resistance was diminished, improving the MFC’s performance. Without any
added redox mediator, maximum power (P
max) and current at P
max were 11.87/4.57/0.12 μW cm−2 and 49.67/22.03/0.59 μA cm−2 for H. volcanii, N. magadii and E. coli, respectively. When neutral red was used as the redox mediator, P
max was 50.98 and 5.39 μW cm−2 for H. volcanii and N. magadii, respectively. In this paper, an archaea MFC is described and compared with other MFC systems; the high salt concentration
assayed here, comparable with that used in Pt-catalyzed alkaline hydrogen fuel cells, will open new options when MFC scaling
up is the objective necessary for practical applications. 相似文献
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Since genetic damage induced by ethanol exposure is controversial and incomplete and because germ and somatic cells constitute
bioindicators for monitoring reproductive toxicity and genotoxic actions of ethanol consumption, the purpose of the present
investigation was to evaluate morphological sperm, oocyte alterations and parental genotoxic effects after sub-chronic ethanol
intake in the CF-1 outbred mouse strain. Ethanol 10% was administered to CF-1 adult male (treated males, TM) and female (treated
females, TF) mice for 27 days, whereas water was given to controls from both sexes too (CM and CF). Post-treatment micronucleus
frequency (MN-PCE/1,000/mouse) and gamete morphology were evaluated. To test whether change of female reproductive status
results in maternal genotoxicity, CF-1 females received ethanol 10% (exposed group, periconceptionally treated females (PTF))
or water (control group, pregnant control females (PCF)) in drinking water for 17 days previous and up to 10 days of gestation.
TM had a high percentage of abnormal spermatozoa vs CM (p < 0.001) and elevated parthenogenetic activated oocyte frequency appeared in TF vs CF (p < 0.001). Sub-chronic ethanol ingestion induced increased MN frequency in TM and TF (p < 0.01). In PTF, where blood alcohol concentrations were between 19–28 mg/dl, very significantly increased MN frequency was
found vs PCF (p < 0.01), whereas MN values were similar to TF. These results show that sub-chronic alcohol ingestion in CF-1 mice produces
sperm head dysmorphogenesis and oocyte nuclear anomalies, suggesting that morphological abnormalities in germ cells are probably
related to parental genotoxicity after ethanol consumption. 相似文献
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