Extracellular enzyme activity: Indications for high short-term variability in a coastal marine ecosystem [0.03%]
胞外酶活性：关于一个海岸海洋生态系统短期变化大的迹象
M Kamer,F Rassoulzadegan
M Kamer
Extracellular α-glucosidase, β-glucosidase, and aminopeptidase activity variations (measured by use of fluorogenic substrate analogs) at a coastal station in the Mediterranean Sea were investigated over a 1-year period. A 27-h cycle and d...
Microbial production, enzyme activity, and carbon turnover in surface sediments of the Hudson River estuary [0.03%]
微生物生产、酶活性及胡德森河河口表层沉积物中的碳周转率
R L Sinsabaugh,S Findlay
R L Sinsabaugh
The detrital food web is a major nexus of energy flow in nearly all aquatic ecosystems. Energy enters this nexus by microbial assimilation of detrital carbon. To link microbiological variables with ecosystem process, it is necessary to unde...
Exopolymers: An ecological characteristic of a floc-attached, ammonia-oxidizing bacterium [0.03%]
胞外聚合物：与硝化细菌相联系的生态特征
G Stehr,S Zörner,B Böttcher et al.
G Stehr et al.
A lithotrophic ammonia-oxidizing bacterium of the Nitrosomonas type was isolated from the lower River Elbe. Enrichment was attained from suspended particulate matter (SPM) of a water sample. At its natural environment, this species almost e...
The role of iron in enhancing anaerobic toluene degradation in sulfate-reducing enrichment cultures [0.03%]
铁在硫酸盐减少富集培养中增强厌氧甲苯降解中的作用研究
H R Beller,M Reinhard
H R Beller
Ferrous iron enhanced the toluene degradation rate of sulfidogenic enrichment cultures inoculated with contaminated subsurface soil from an aviation fuel storage facility near the Patuxent River (Md.). Ferrous iron had an analogous effect o...
B Schweitzer,M Simon
B Schweitzer
We studied nutrient-limitation of bacterioplankton growth in Lake Constance, a mesotrophic lake, between February and August in 1992. We amended 1-μm filtrates with a single nutrient or nutrient combinations at 5 or 10 μm final concentrat...
Adaptation of inducible defense in Euplotes daidaleos (Ciliophora) to predation risks by various predators [0.03%]
变形虫Euplotes daidaleos对各种捕食者的捕食风险的适应性诱导防御反应
J Kusch
J Kusch
The extent of induced morphological defense in Euplotes daidaleos correlates to this ciliate's predation risk from the defense-inducing predator species. Euplotes daidaleos responded by morphological transformation only to organisms that ar...
Grazing of nonindigenous bacteria by nano-sized protozoa in a natural coastal system [0.03%]
纳米原生动物在自然近海系统中捕食非土著细菌
K Christoffersen,T Ahl,O Nybroe
K Christoffersen
Mesocosms (∼4.5 m(3)) situated in a closed bay area were used to investigate the effect of protozoan predation on nonindigenous bacteria. Pseudomonas fluorescens strain Agl was released into mesocosms as a single inoculum of 1 × 10(5) cel...
Sulfate reduction processes in sediments at different sites in Lake Kinneret, Israel [0.03%]
以色列加利利海不同地点沉积物中硫酸盐还原过程的研究
O Hadas,R Pinkas
O Hadas
Lake Kinneret, Israel, is a warm (13-30°C) monomictic lake that stratifies in April and turns over in December. Between January and June each year, a heavy bloom (up to 250 g wet weight n(-2) 2) of the dinoflagellate Peridinium gatunense d...
M Y Deng,D O Cliver
M Y Deng
The objectives of this study were to determine the role of microbial activity in inactivation of hepatitis A virus (HAV) and to learn how the virus is inactivated. Of 31 bacterial strains isolated from animal manure, 10 efficiently inactiva...
Diel, seasonal, and depth-related variability of viruses and dissolved DNA in the northern Adriatic Sea [0.03%]
亚得里亚海北部海域病毒和溶解DNA的日变化、季节变化及深度分布差异性研究
M G Weinbauer,D Fuks,S Puskaric et al.
M G Weinbauer et al.
The depth-dependent, seasonal, and diel variability of virus numbers, dissolved DNA (D-DNA), and other microbial parameters was investigated in the northern Adriatic Sea. During periods of water stratification, we found higher virus abundan...