Bacterial amylotytic substances.

Extracellular polymeric substances responsible for bacterial adhesion onto solid surface.

The influence of extracellular polymeric substances (EPS) on bacterial cell adhesion onto solid surfaces was investigated using 27 heterotrophic bacterial strains isolated from a wastewater treatment reactor. Cell adhesion onto glass beads was carried out by the packed-bed method and the results were discussed in terms of the amount of each EPS component produced and cell surface characteristic...

Bacterial Incorporation of Organic Substances Released by Natural Phytoplankton Populations*

A modified differential filtration was used to measure extracellular release of primary products by natural phytoplankton populations and subsequent incorporation of these products by bacteria. Water samples were incubated with I4C labelled bicarbonate for 6 h and 24 h , respectively. A time course experiment showed that 6 h are sufficient for attaining an approximate isotopic equilibrium betwe...

Chemical “ Substances ” That Are Not “ Chemical Substances ”

The main scientific problems of chemical bonding were solved half a century ago, but adequate philosophical understanding of chemical combination is yet to be achieved. Chemists routinely use important terms (“element,” “atom,” “molecule,” “substance”) with more than one meaning. This can lead to misunderstandings. Eliminativists claim that what seems to be a baseball breaking a window is merel...

Substances reacting as hexosamine and as N-acetylhexosamine liberated from bacterial cell walls by lysozyme.

Production of macroaggregates from dissolved exopolymeric substances (EPS) of bacterial and diatom origin.

Exopolymeric substances (EPS) isolated from a pure culture of the marine bacterium Marinobacter sp. and the marine diatom Skeletonema costatum (axenic) were partially purified, chemically characterized and used as dissolved organic matter (DOM) for the production of macroaggregates. The role of organic particles such as transparent exopolymeric particles (TEP) and Coomassie stained particles (C...