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The effects of starvation and emersion on the ammonia effluxes of Mytilus edulis L. were studied. Both fed and starved groups showed similar patterns of efflux during re-immersion, indicating no compensation
for starvation during anaerobic catabolism; this is taken as evidence that carbohydrate or lipid is the predominant energy
source at the outset of anaerobiosis. Instead of an overshoot of ammonia excreted during the 4 h following re-immersion, all
groups showed significantly reduced efflux rates independent of emersion duration. Such results suggest some conversion of
ammonia during the recovery period, as no significant drop in haemolymph ammonia occurred at this time. The level of ammonia
accumulation in haemolymph and mantle cavity fluid decreased exponentially with emersion duration, implying the stabilisation,
at a low rate, of ammonia production after a relatively long period of emersion (16 to 24 h). Oxygen levels of the mantle
cavity fluid dropped rapidly during emersion but never attained anoxia over 24 h of emersion, which may indicate some oxygen
uptake by emersed mussels. It has been concluded that the behaviour and physiological responses shown by M. edulis to emersion appear to reflect a need for respiratory gas exchange more than a response to desiccation – presumably in the
interest of energy-conservation. The reductions in ammonia efflux rate during emersion and, to a certain extent, immediately
after re-immersion have also been considered here to be energy-saving strategies that illustrate the importance of ammonia
in restoring normal levels of some amino acids following re-immersion.
Received: 26 August 1997 / Accepted: 27 May 1999 相似文献
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Sadok Khouadja Elisabetta Suffredini Besma Baccouche Luciana Croci Amina Bakhrouf 《Environmental monitoring and assessment》2014,186(10):6935-6945
Pathogenic Vibrio species are an important cause of foodborne illnesses. The aim of this study was to describe the occurrence of potentially pathogenic Vibrio species in the final effluents of a wastewater treatment plant and the risk that they may pose to public health. During the 1-year monitoring, a total of 43 Vibrio strains were isolated: 23 Vibrio alginolyticus, 1 Vibrio cholerae, 4 Vibrio vulnificus, and 15 Vibrio parahaemolyticus. The PCR investigation of V. parahaemolyticus and V. cholerae virulence genes (tlh, trh, tdh, toxR, toxS, toxRS, toxT, zot, ctxAB, tcp, ace, vpi, nanH) revealed the presence of some of these genes in a significant number of strains. Intraspecies variability and genetic relationships among the environmental isolates were analyzed by random amplified polymorphic DNA-PCR (RAPD-PCR). We report the results of the first isolation and characterization of an environmental V. cholerae non-O1 non-O139 and of a toxigenic V. parahaemolyticus strain in Tunisia. We suggest that non-pathogenic Vibrio might represent a marine reservoir of virulence genes that can be transmitted between strains by horizontal transfer. 相似文献
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Jabeur Fadoua Mechri Sondes Mensi Fethi Gharbi Ines Naser Yosri Ben Kriaa Mouna Bejaoui Nejla Bachouche Samir Badis Abdelmalek Annane Rachid Djellali Mostapha Sadok Saloua Jaouadi Bassem 《Environmental science and pollution research international》2022,29(24):36023-36039
Environmental Science and Pollution Research - The diversity of marine biomasses is a set of exploitable and renewable resources with application in several sectors. In this context, a co-culture... 相似文献
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