Microorganisms migrating into and through soil from sources on the land surface may cause a serious threat to both ground and surface waters. It has been estimated that microorganisms can migrate significant distances in the field. Results from various studies suggested that preferential flow through macropores, worm holes, cracks, and fractures is the main reason for such observations. However...

The purpose of this project was to build an engine that could be used to create various simulations involving programmable microorganisms. The project was written using an object-oriented language called breve. Separate object classes were created for the organisms, chemicals, sensors and emitters. Several different quorum sensing and chemotaxis simulations were created in order to test the sim...

Signal transduction is a topic that pervades the current literature, and well it should, since it encompasses studies from mitogenesis to synaptic transmis­ sion (1,19,124), Recent years have seen pieces of many cell and physiolog­ ical puzzles fall into place, and the pieces repeatedly are cell surface receptors (30, 130), G proteins (12, 13,49,63,82), second messengers (3, 6, 7, 78b, 90), and...

region of the genes, denominated HAIR (HspR associated inverted repeat). For these studies we will construct a null mutant in gen CC0081, whose phenotype will be analyzed with respect to different kinds of environmental stresses. Another objective of this project deals with the characterization of 5 ECF (extracytoplasmic function) sigma factors from Caulobacter: SigF, SigU, SigT, SigE and SigR....

Ethylene-producing strains of Penicillium cyclopium and P. crustosum were isolated from soil. These isolates produced ethylene on a variety of carbon growth substrates including phenolic acids. The quantities of ethylene produced on the various substrates varied, and the subtrate-ethylene prosuction pattern for P. cyclopium strains differed significantly from that of P. crustosum strains.

INTRODUCTION Contaminated sponges might lead to cross-contamination in kitchens since they can transfer microorganisms to surfaces where microorganisms can survive for hours or days and contaminate food. The main objective of this study was to evaluate the transfer and the survival of bacteria from kitchen sponges to surfaces of AISI 316 stainless steel and polyethylene. METHODOLOGY Twenty-fo...

Demand of all living organisms on the same nutrients forms the basis for interspecific competition between plants and microorganisms in soils. This competition is especially strong in the rhizosphere. To evaluate competitive and mutualistic interactions between plants and microorganisms and to analyse ecological consequences of these interactions, we analysed 424 data pairs from 41 (15)N-labell...

forty bacteria species commonly found in soil, sediments, and sewage effluent were exposed for acclimation to inorganic and organic mercury compounds using sterilized sediments as the culture medium. screening tests for the ability of microorganisms to methylate inorganic mercury were made on all 40 species after acclimation to 13.5 mg/i mercuric chloride. additional screening tests for demethy...