The objective of this study was to determine the ecological relationships between bacterial species that colonize infected root canals. Root canal bacteria recovered from one patient with pulp canal necrosis were evaluated in vitro for synergistic and antagonistic activities determined by mono and co-culture growth kinetics and the production of bacteriocin-like substances using the double laye...

Very small amounts of substances inhibiting the growth of amounts less than about 10-2 mgm. of well-dispersed and suspended tubercle bacilli can be readily and unknowingly introduced into Long's synthetic medium. This fact is of great importance when investigating probable growth factors for these bacilli. It is of equal importance in in vitro studies of the probable inhibiting or lethal effect...

Plant growth-promoting bacteria (PGPB) are commonly used to improve crop yields. In addition to their agricultural usefulness, there are potential benefits in environmental applications. For example, species of Azospirillum can increase bioremediation of wastewater by microalgae by increasing algal proliferation and metabolism. Additionally, these genera and several other bacterial species may ...

Until recently there has been no demonstrated case in Neurospora in which the loss of activity of an essential enzyme could be attributed to gene mutation. It has been assumed from indirect evidence1 that gene mutations do cause such losses and thereby result in “blocks” of essential biochemical reactions. The products of the “blocked” reactions thus become essential growth substances for the m...

the current study is focused on determination of the accumulation rate of cadmium (cd) and lead (pb) in the liver and muscle tissues of the caspian kutum fish. specimens were collected randomly from twelve stations in mazandaran province, the caspian sea basin, between october 2009 and march 2010. fork length, weight and length-weight relationship of samples were measured. one-way analysis of v...

The growth of crown-gall tumors on primary bean leaves (Phaseolus vulgaris L. cv. "Pinto") was promoted by the addition of d-lysopine, d-octopine, l-carnosine, or nopaline. Assayed on tumors induced by Agrobacterium tumefaciens strain B6, the relative activity was octopine = carnosine > lysopine >> nopaline; assayed on tumors induced by A. tumefaciens strain T-37, which induces tumors which for...