Two tripeptide amides with stuctures similar to thyrotropin releasing hormone were isolated from human seminal fluid and their amino acid sequences determined. The peptides were purified by gel exclusion from Sephadex G50 and were detected by radioimmunoassay with thyrotropin releasing hormone antibody; in addition, N-terminally extended forms were demonstrated by radioimmunoassay after trypsin...

The laminins belong to a family of trimeric basement membrane glycoproteins with multiple domains, structures, and functions. Endothelial cells bind laminin-1 and form capillary-like structures when plated on a laminin-1–rich basement membrane matrix, Matrigel. Laminin-1 is composed of 3 chains, a1, b1, and g1. Because laminin-1 is known to contain multiple biologically active sites, we have sc...

Halorhabdus utahensis, Natronomonas pharaonis, Haloferax sulfurifontis and Halobaculum gomorrense were grown at salinity values between 10% and 30% NaCl (w/v). The strains represent four haloarchaeal genera and have a range of salinity optima. Analysis of core membrane lipids of each strain using gas chromatography–mass spectrometry (GC–MS) revealed structures consistent with saturated, unsatur...

Hydrocarbons were the major lipid class extracted by hexane from the vitelline membrane surface of dechorionated eggs of the house fly, Musca domestica, the New World screwworm, Cochliomyia hominivorax, the secondary screwworm, Cochliomyia macellaria, the green bottle fly, Phaenicia sericata, the sheep blow fly, Lucilia cuprina and the Mexican fruit fly, Anastrepha ludens. The length of time th...

Cholesterol is a ubiquitous hydrocarbon compound that can serve as substrate for microbial growth. This steroid and related cyclic compounds are recalcitrant due to their low solubility in water, complex ring structure, the presence of quaternary carbon atoms, and the low number of functional groups. Aerobic metabolism therefore makes use of reactive molecular oxygen as co-substrate of oxygenas...

Salt-alkaline stress generally leads to soil compaction and fertility decline. It also restricts rice growth and phosphorus acquisition. In this pot experiment, two relatively salt-alkaline tolerant (Dongdao-4 and Changbai-9) and sensitive (Changbai-25 and Tongyu-315) rice genotypes were planted in sandy (control) and salt-alkaline soil to evaluate the characteristics of dry matter and phosphor...