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the present study investigated the isolation and identification of biosurfactant producing bacteria from iranian oil wells. the biosurfactant production of bacteria isolates was evaluated and confirmed using hemolysis and emulsification tests. the biodegradation of crude oil was studied using gc and hplc analysis. a total of 45 strains have been isolated. these strains showed less than a 40 mn ...

A bacterial strain (designated as Alcaligenes sp. MS-103) isolated from oil sample of the Aghajari oilfield in the south of Iran, was able to produce an effective extracellular lipopolysaccharide biosurfactant (1.2±0.05 g/l) on molasses as a sole carbon source. The highest surface tension reduction to level 20 mN/m was achieved by biosurfactant produced by cells grown on molasses under optimum ...

Fibrosis is the pathological condition resulting in the growth of excess fibrous connective tissue in an organ or body system as a reparative or reactive process. In the field of clinical pathology, clinicians and medical scientists are endeavoring to translate experimental knowledge into effective, innovative treatments for a range of fibrotic conditions. The amelioration of whole organ functi...

Crystallization kinetics of Fe52Cr18Mo7B16C4Nb3 alloy was evaluated using X-ray diffraction, differential scanning calorimetric (DSC) tests and TEM observations in this research work. In effect, crystallization and growth mechanisms were investigated using DSC tests in four different heating rates (10, 20, 30, 40 K/min) and kinetic models (i.e. Kissinger- Starink, Ozawa, and Matusita methods). ...

The radiation-induced bystander effect is the phenomenon which non-irradiated cells exhibit effects along with their different levels as a result of signals received from nearby irradiated cells. Responses of non-irradiated cells may include changes in process of translation, gene expression, cell proliferation, apoptosis and cells death. These changes are confirmed by results of some In-Vivo s...

The immunologic defense mechanism is well demon­trated in neoplasia of animals and human. Spontaneous regression of many human tumors such as malignant melanomas, 1vmphosarcomas, neuroblastomas choriocar­cinomas, adenocarcinomas and leukemias is due to the defense mechanism of lymphoretrcular system. The discovery of carcinoembrvonicantigen in carcinoma of gastrointestinal tract and the alpha-f...

liver is one of the most important organs needing great concern during the perioperative period. there are a number of different mechanisms that interact with liver cells and might affect their integrity and cell live. though these mechanisms are not all the same, there is a great common point: all affect the metabolic pathways of the liver. ischemia, anesthetic drug effects and other periopera...