Tryptophanyl peptide bonds are oxidatively cleaved by “active iodine” that is generated with HzOz, iodide, and a peroxidase (donor: HzOz oxidoreductase, EC 1.11.1.7). Complete oxidation of tryptophan derivatives and peptides to the oxindole occurs within 2 min at pH 3 to 5 with either lactoperoxidase or horseradish peroxidase, and a Z&fold molar excess of iodide plus HzOz. Under identical condi...

Erythrocytes are hemolyzed by myeloperoxidase, an H2O2-generating system (glucose + glucose oxidase; hypoxanthine + xanthine oxidase) and an oxidizable cofactor (chloride, iodide, thyroxine, triiodothyronine). The combined effect of chloride and either iodide or the thyroid hormones is greater than additive. Myeloperoxidase can be replaced by lactoperoxidase in the iodide-, thyroxine and triiod...

In the present work, amorphous bio-based polymer electrolytes (BBPEs) using alginate as a matrix host and doped with varying amounts of ammonium iodide (NH4I) have been developed via solution casting technique. The physicochemical properties alginate-NH4I BBPEs were evaluated by X-Ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FTIR), thermal gravimetric a...

nitrate and ammonium forms of nitrogen are being applied to improve plant growth and uptake of other nutrients. given that the effect of application of different nitrate to ammonium ratios accompanied by other fertilizers (i.e. fe, mn and zn) has not been studied on wheat growth as well as uptake of fe, mn and zn, three glasshouse pot studies were conducted with factorial arrangement of treatme...

Erythrocytes are hemolyzed by myeloperand triiodothyronine-dependent, but not oxidase, an H203-generating system (gluin the chloride-dependent, systems. Hemocose + glucose oxidase; hypoxanthine + lysis is inhibited by the peroxidase inxanthine oxidase) and an oxidizable cohibitors, azide and cyanide, and by catafactor (chloride, iodide, thyroxine, tnlase and is stimulated by superoxide iodothyr...

Cobra venoms contain heat stable, basic, proteins that inhibit iodide accumulation by thyroid slices. Activity is not related to the content of phospholipase A or various other enzymatic activities. These proteins are present only in Elapid venoms and not in snakes of the Crotalidae or Viperidae families. Two such basic proteins, named cobramines A and B, have been purified from the crude venom...

We describe a preconcentration device that may be suitable for quantitative analysis of trace volatile ketones and aldehydes in ambient air as well as in human breath. The approach is based on microreactor chips fabricated from silicon wafers. The microreactors have thousands of micropillars in microfluidic channels for uniformly distributing a gaseous sample flowing through the chips. The surf...

Cobra venoms contain heat stable, basic, proteins that inhibit iodide accumulation by thyroid slices. Activity is not related to the content of phospholipase A or various other enzymatic activities. These proteins are present only in Elapid venoms and not in snakes of the Crotalidae or Viperidae families. Two such basic proteins, named cobramines A and B, have been purified from the crude venom...

Thyroid iodide uptake through the sodium-iodide symporter (NIS) is not only an essential step for thyroid hormones biosynthesis, but also fundamental for the diagnosis and treatment of different thyroid diseases. However, part of patients with thyroid cancer is refractory to radioiodine therapy, due to reduced ability to uptake iodide, which greatly reduces the chances of survival. Therefore, c...