نتایج جستجو برای: planktonic
تعداد نتایج: 6092 فیلتر نتایج به سال:
The extracellular biofilm matrix includes primarily DNA and exopolysaccharides (EPS), which function to maintain aggregate structures and to protect biofilms from antibiotics and the immune response. Both polymers are anionic and have cation binding activity, however the impact of this activity on biofilms is not fully understood. Host cell contact is considered the primary signal for activatio...
Many strains of Acinetobacter baumannii have been described as being able to form biofilm. Small non-coding RNAs (sRNAs) control gene expression in many regulatory circuits in bacteria. The aim of the present work was to provide a global description of the sRNAs produced both by planktonic and biofilm-associated (sessile) cells of A. baumannii ATCC 17978, and to compare the corresponding gene e...
The radiogenic neodymium (Nd) isotope composition of foraminiferal shells provides a powerful archive to investigate past changes in sources and mixing of water masses. However, seawater Nd isotope ratios extracted from foraminiferal shells can be biased by contaminant phases such as organic matter, silicates, or ferromanganese coatings, the removal of which requires rigorous multiple step clea...
Planktonic gross primary production (GPP), community respiration (CR), and nitrification (NIT) were measured monthly in the Scheldt estuary by the oxygen incubation method in 2003. No significant evolution of planktonic GPP was observed since the 1990s with high rates in the freshwater area (salinity 0; 97 6 65 mmol C m d) decreasing seaward (22–37 mmol C m d). A significant decrease of NIT was...
Planktonic Foraminifera are ubiquitous marine protozoa inhabiting the upper ocean. During life, they secrete calcareous shells, which accumulate in sediments, providing a geological record of past spatial and temporal changes their community structure. As result, provide opportunity to analyze both current historical patterns species distribution turnover this plankton group on global scale. Th...
Abstract. Applications of fossil shells planktonic foraminifera to decipher past environmental change and plankton evolution require a robust operational taxonomy. In this respect, extant provide an opportunity for benchmarking the dominantly morphological species concepts classification group by considering ecological, physiological genetic characters. Although basic framework taxonomy has bee...
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