Measures for the introduction of organic agriculture, along with use appropriate techniques in imply rejection chemical-synthetic growth regulators or hormones; limited, strictly tied to area, livestock; feeding animals, if possible, their own feed, minimum purchase feed and avoiding antibiotics. However, there is currently no way permanently stop using Therefore, a gradual decrease doses, freq...

One problem in aquaculture is obtaining brood because many commercially important species are incapable of spontaneous maturation under artificial conditions. Commercial shrimp hatcheries commonly use eyestalk ablation to stimulate gonadal maturation in shrimps. Research has been conducted on the inhibition of reproductive maturation by hormones originating in the eyestalk glands and on other e...

VAUGHAN, MARTHA. Effect of Pitressin on lipolysis and on phosphorylase activity in rat adipose tissue. Am. J. Physiol. 207 (5) : 1166-r 16%. rg64.-Pitressin, a mixture of arginine and lysine vasopressins, stimulates the release of glycerol and of free fatty acids from rat epididymal fat pads in vitro. This effect is inhibited by prostaglandin El, which has previously been shown to interfere wit...

Pro-vasopressin and pro-oxytocin are prohormones processed in the neurointermediate lobe pituitary to form the biologically active peptide hormones, arginine vasopressin (AVP) and oxytocin. Neurointermediate lobe pituitaries from normal (+/+), heterozygous (+/-), PC2-Null (-/-), PC1/3-Null and oxytocin-Null mice were analyzed by SELDI-TOF mass spectroscopy for the peptide hormone products, AVP,...

Results of studies reported here show that adsorption could result in considerable accumulation of hormones on hydrophobic hollow fiber membrane surfaces during filtration of trace-hormone-containing feed solutions with a linear adsorption isotherm applicable over the majority of the estrone concentration range examined (2.6-154 ng/L). Models based on both diffusion and surface reaction limitat...

The synthetic anabolic steroids have structural features which distinguish them from the natural steroid hormones. It should therefore be possible to detect the taking of these substances by testing for their presence in either blood or urine. At present suitable techniques include gas chromatography, mass spectrometry and radioimmunoassay. For practical and psychological reasons urine tests ar...

Pancreatic islet beta-cells secrete the hormones insulin, amylin and pancreastatin. To search for further beta-cell hormones, we purified peptides from secretory granules isolated from cultured murine beta TC6-F7 beta-cells. We identified a 34-amino-acid peptide (3948 Da), corresponding to Asp(69)-Leu(102) of the proinsulin-like growth factor II E-peptide, which we have termed 'preptin'. Prepti...

Beyond their role in cell metabolism, development, and reproduction, hormones are also important modulators of the immune system. In the context of inflammatory disorders, systemic administration of pharmacological doses of synthetic glucocorticoids (GCs) is widely used as an anti-inflammatory treatment [1, 2]. However, not all actions of GCs are immunosuppressive, and many studies have suggest...

Numerous steroids are essential plant, animal, and human hormones. The medical and industrial applications of these hormones require the identification of new synthetic routes, including biotransformations. The metabolic fate of a steroid can be complicated; it may be transformed into a variety of substituted derivatives. This may be because a steroid molecule can adopt several possible orienta...