Escherichia coli contains at least two iron storage proteins, a ferritin (FtnA) and a bacterioferritin (Bfr). To investigate their specific functions, the corresponding genes (ftnA and bfr) were inactivated by replacing the chromosomal ftnA and bfr genes with disrupted derivatives containing antibiotic resistance cassettes in place of internal segments of the corresponding coding regions. Singl...

Alumina-rich iron ore is a widely existed polymetallic deposit in the nature, and it has a high comprehensive utilization value. Because the alumina and iron contents of alumina-rich iron ore vary from each other, there are many different measures and processes to recover iron and alumina from the various kinds of alumina-rich iron ore. In the blast furnace (BF) ironmaking process, the alumina ...

Comparative studies were made of the metabolic activities of a strain of Staphylococcus aureus grown in iron-poor and iron-rich trypticase medium, with and without glucose. Four nutritionally distinctive types of organisms were produced : iron-rich without glucose (Fe + G ) ; ironpoor without glucose (Fe G ) ; iron-rich with glucose (Fe + G + ) ; iron-poor with glucose (FeG + ) . Fe+ G cocci ox...

BACKGROUND Phenolic compounds act as food antioxidants. One of the postulated mechanisms of action is chelation of prooxidant metals, such as iron. Although the antioxidative effect is desirable, this mechanism may impair the utilization of dietary iron. OBJECTIVE We sought to determine the effect of phenolic-rich extracts obtained from green tea or rosemary on nonheme-iron absorption. DESI...

The present article presents the study of three laterites from Triãngulo Mineiro and Alto Paranaíba region, aiming to use it as a pavement base. methodology used consisted carrying out tests prescribed by DNIT 098/2007 standard and, complementary methodology, linear contraction, MCT classification, modulus resilience X-ray diffractometry were introduced. Four mixtures laterite with sand prepare...

Kuh-E-Faryadoon and Kouli Kosh iron deposits are hosted by regional metamorphic rocks of Sanandaj-Sirjan zone around Deh-Bid area. Plugs and domes of acid rocks protrude these metamorphic rocks. A mylonitization event is super imposed on acid rock and metamorphic complexes. Field, petrological and geochemical studies have shown that (1) Iron mineralization have occurred during mylonitization in...

kuh-e-faryadoon and kouli kosh iron deposits are hosted by regional metamorphic rocks of sanandaj-sirjan zone around deh-bid area. plugs and domes of acid rocks protrude these metamorphic rocks. a mylonitization event is super imposed on acid rock and metamorphic complexes. field, petrological and geochemical studies have shown that (1) iron mineralization have occurred during mylonitization in...