background: long-term extraction and production of various oil derivatives causes contamination of soil adjacent to production and refining area. the main important issue is the ecological hazard of these pollutants. the main aim of the study was to identify and separate native bacteria that are responsible for degradation of oil contaminated fields. methods: we prepared a compound sample of co...

the objective of this research was to study the feasibility of a two stage continuous system employing anaerobic-aerobic microbial film for domestic wastewater treatment and the effect of iron on the behavior of sulfate reducing bacteria in anaerobic metabolism. a bench scale system with an anaerobic filter followed by aerobic fixed units used plastic media and was operated in up flow manner wi...

background; providing safe drinking water is a prime concerninany community. this analytical study was carried out to evaluate the microbial quality of drinking water in rural areas of northeastern iran. methods;the water microbial quality was determined in all villages (a population of 53047 people), in 3 rounds and based on 3 measurements, i.e. total coliform, fecal coliform, and heterotrophi...

objective the extensive pollution of natural ecosystems has occurred by organophosphorus pesticides, being used for improvement of crop production in agriculture. biodegradation is interested in application of multifunctional bacteria containing genetical elements which specially degrade organophosphorus compounds. in this paper the detection of two bacteria species, pseudomonas and flavobacter...

background and objectives: this paper describes chemical composition and antimicrobial activity of cymbopogon nardus citronella essential oil against edwardsiella spp. (n = 21), vibrio spp. (n = 6), aeromonas spp. (n = 2), escherichia coli (n = 2), salmonella spp. (n = 2), flavobacterium spp. (n = 1), pseudomonas spp. (n = 1) and streptococcus spp. (n = 1) isolated from internal organs of aquat...

background and objectives: sodium dodecyl sulfate (sds) is one of the main surfactant components in detergents and cosmetics, used in high amounts as a detergent in products such as shampoos, car wash soap and toothpaste. therefore, its bioremediation by suitable microorganisms is important. alkylsulfatase is an enzyme that hydrolyses sulfate -ester bonds to give inorganic sulfate and alcohol. ...

abstract the objective of this study was to determine the effect of psychrotrophic bacteria and somatic cells on the physicochemical characteristics of iranian ultrafiltered (uf) white cheese. milks with different numbers of psychrotrophic bacteria (1×106, 5×106 and 10×106 cfu/ml) and low somatic cell counts (scc, <2×105/ml) were selected and uf white cheese trials were produced. in a separate ...

fruit leather is one of dried product with variable production, good marketing and popular consumption in many countries of the world. in this research, the effect of concentration temperature (55-75 °c) and time (20-40 min) and drying temperature (40-70 °c) on the chemical composition (brix, ph, sugars and vitamin c) and the microbial properties of apple leather investigated. the results showe...

to determine the prevalence of bacterial mastitis in cattle, milk samples positive for california mastitistest (cmt) were cultured during a period of almost 4 years. the bacterial species isolated from 2904 milksamples studied were coagulase negative staphylococcus sp. in 879 (30.27%) samples, streptococcusagalactiae in 642 (22.11%), s. dysgalactiae in 332 (11.43%), e. coli in 295 (10.16%), sta...

l-asparaginase is a candidate enzyme for anti-neoplastic agent againstacute lymphoblasticleukemia and also extensively use in the food industry for prevention of acrylamide formation. l-asparaginase is widely distributed among microorganisms. in this study, marine bacteria were isolated from persian gulf and screened for l-asparaginase activity. production of l-asparaginase was carried out by u...