Biosurfactant production using Candida bombicola ATCC 22214, its characterization and potential applications in enhancing oil recovery were studied at laboratory scale. The seed media and the production media were standardized for optimal growth and biosurfactant production. The production media were tested with different carbon sources: glucose (2%w/v) and corn oil (10%v/v) added separately or...

The carbon source markedly influenced the qualitative and quantitative composition of cellular hydrocarbons in Cladosporium resinae. Total lipid and hydrocarbon content was greater in cells grown on n-alkanes than in cells grown on glucose or glutamic acid. Glucose-grown cells contained a spectrum of aliphatic hydrocarbons from C(7) to C(36); pristane and n-hexadecane comprised 98% of the total...

The highly symmetric 13-aza-4,4,8,8,12,12-hexamethyl-2,6,10-trioxatricyclo[7,3,l,0513]tridecane is of general interest regarding several aspects. First, the molecule belongs to the rare point group C3. Second it is being discussed as a possible complexing agent [1]. Furthermore the title compound is quite inert against some drastic reaction con­ ditions, e.g. it does not react with lithium alu­...

Utilization of various hydrocarbons by microbes is well known (Beerstecher, 1954), but little has been reported on the cellular composition of hydrocarbongrown cells. No doubt it has been assumed that these cells differ little from those cultivated on nonhydrocarbon substrates and, in general, this assumption is probably true. But it is recognized that substrates and cultural conditions can inf...

The genus Tanacetum L. is one of the most important medicinal plant that contains 28 species in Iran, 12 of them are endemics. This paper reports the essential oil composition of Tanacetum hololeucum (Bornm.) Podlech; Tanacetum kotschyi (Boiss.) Grierson, growing wild in Iran. Plant flowers were collected from different zones of Dizin in north of Iran. All samples were hydro-distilled (Clevenge...

Abstract Hydrometers are widely used in industry for liquid density measurement. It is important to achieve rapid and high accuracy calibration hydrometers. Based on the Archimedes principle, a fully automatic hydrometer system NIM was designed using Cuckow’s method. The of n -tridecane (C 13 H 28 )is calibrated with 441 g high-purity fused silica ring as solid standard. buoyancy measured by st...