Elevated organic matter (OM) export flux promotes marine anoxia, thus increasing carbon sequestration efficiency and decreasing atmospheric dioxide levels. However, the mechanisms that trigger sustain anoxic events—particularly those associated with nutrient-poor, oligotrophic surface waters—remain poorly constrained. Mediterranean Sea sapropels are well-preserved sediments deposited during epi...

The uptake of 3H-labeled leucine into proteins, a widely used method for estimating bacterial carbon production (BCP), is suggested to underestimate or overestimate growth in the open ocean by factor 40 uncertainty. Meanwhile, an alternative BCP approach, dilution method, has untested concerns about potential overestimation from dissolved substrates released filtration. We compared BCPDil and B...

The Tibetan Plateau, also termed ‘the Third Pole’ harbors the largest number of high-altitude lakes in world. Due to presence extreme conditions such as low temperature and oligotrophy, Plateau share environmental features common with polar regions. However, extent which these environments are analogous, or indeed whether they harbor similar microbial communities a high level endemic species is...

Among the two types of bacterial L-asparaginases, only type II enzymes have been used inthe treatment of acute lymphoblastic leukemia owing to their higher affinity for L-asparagine.However, current screening media used for the isolation of L-asparaginase-producingmicroorganisms do not discriminate between the two types of L-asparaginase. During anoptimization study conducted to increase L-aspa...

Among the two types of bacterial L-asparaginases, only type II enzymes have been used inthe treatment of acute lymphoblastic leukemia owing to their higher affinity for L-asparagine.However, current screening media used for the isolation of L-asparaginase-producingmicroorganisms do not discriminate between the two types of L-asparaginase. During anoptimization study conducted to increase L-aspa...

Global warming, eutrophication, fisheries overexploitation, species invasions, and habitat loss are the major threats to freshwater biodiversity. The aim of this study was determine richness diversity fish in 535 Polish lakes different morphometry (area more than 50 ha a maximum depth ranging from 0.4 108.5 m) trophic status (from oligotrophy hypereutrophy). A total 39 were found studied lakes,...

Erwinia amylovora causes fire blight, a destructive disease of rosaceous plants distributed worldwide. This bacterium is a nonobligate pathogen able to survive outside the host under starvation conditions, allowing its spread by various means such as rainwater. We studied E. amylovora responses to starvation using water microcosms to mimic natural oligotrophy. Initially, survivability under opt...

The zooplankton assemblages in Chilean Patagonian lakes are characterised mainly by their low biodiversity and high predominance of calanoids copepods, a pattern that has been studied for large and deep lakes between 38-51° S, and shallow ponds at 51° S. The aim of the present study was analyse the zooplankton assemblages in different water bodies located in coastal zones, middle valleys and mo...