Negative Chemotaxis of Marine Bacteria to Toxic Chemicals

Negative chemotaxis of marine bacteria to toxic chemicals.

The positive chemotactic responses of motile marine bacteria were reversed by the addition of sublethal concentrations of a toxic chemical. The negative chemotactic effect was observed with a wide range of toxicants including heavy metals and hydrocarbons. This phenomenon may be utilized to develop new approaches for control of marine fouling.

Chemotaxis toward phytoplankton drives organic matter partitioning among marine bacteria.

The microenvironment surrounding individual phytoplankton cells is often rich in dissolved organic matter (DOM), which can attract bacteria by chemotaxis. These "phycospheres" may be prominent sources of resource heterogeneity in the ocean, affecting the growth of bacterial populations and the fate of DOM. However, these effects remain poorly quantified due to a lack of quantitative ecological ...

Bioremediation of toxic substances by mercury resistant marine bacteria.

Bioremediation of toxic substances includes microbe-mediated enzymatic transformation of toxicants to non-toxic, often assimilable, forms. Mercury-resistant marine bacteria are found to be very promising in dealing with mercury, and a host of other highly toxic heavy metals and xenobiotics. In the present studies we have shown that the Pseudomonas aeruginosa CH07 (NRRL B-30604) has been able to...

Pesticides and toxic chemicals

‘Contamination’ is a comparative term. In Britain at least, contaminants are trace substances; in the context of food they are distinguished from additives by whether or not there is an intention that the substances should be present when the food is consumed or prepared for consumption. Contaminants may be of natural or of technological origin: and technological contaminants may be direct or i...

ToxiC inhalaTional injury and ToxiC indusTrial ChemiCals