We have been interested for some time in thiosemicarbazide derivatives of periodate-oxidized polysaccharides many of which show considerable activity against Sarcoma 180 (S-180) in the mouse (2). The antitumor activity and toxicity of these deriva tives are completely reversed if pyridoxine (B6) is administered at the same time. We were led to investigate glyoxal and methylglyoxal bisthiosemica...

HIE-124 is the new member of ultra-short acting hypnotics drug family. In this research, thiadiazole can act as the bio-isosteric replacement of thiazole in synthesized compounds as HIE-124 derivatives. HIE-124 drug, in which the heterocyclic thiazole ring replaced to thiadiazole, will be presented. Thiadiazolodiazepines were synthesized by a two-step reaction starting from the amino thiadiazol...

Tetranitromethane, Inhibition of Photosynthesis, Oxygen Evolution, Photosystem II Low concentrations (10 /xM) of tetranitromethane inhibit noncyclic electron transport in spinach chloroplasts. A study of different partial electron transport reactions shows that tetranitromethane primarily interferes with the electron flow from water to PS II. At higher concentrations the oxida­ tion of plastohy...

The title compound, C(8)H(11)N(5)S, has been prepared by the reaction of 2-acetyl-pyrazine with 4-methyl-3-thio-semi-carbazide. It exists in the thione form and adopts the E configuration. The mol-ecules are connected by the inter-molecular N-H⋯N and N-H⋯S inter-actions.

A spectrophotometric method employing 2-hydroxybenzaldiminoglycine (HBIG) is proposed for the determination of chromium(III). The results of the determinations are compared with the standard diphenyl carbazide method. The presently developed method is direct, simple, rapid, selective, sensitive and precise. DOI: 10.1134/S106193480601@@@@

In the title mol-ecule, C(10)H(13)N(3)O(3)S·2H(2)O, the thio-semi-carbazide =N-NH-C(=S)-NH- fragment [torsion angle = 0.2 (1)°] is nearly coplanar with the benzene ring [dihedral angle = 2.4 (1)°]. The benzene ring and semicarbazide moiety are located on opposite sites of the C=N bond, showing an E configuration. The hy-droxy, imino and water H atoms are engaged in extensive hydrogen bonding, f...

To add to the understanding of the properties of functionalized carbon nanotubes in biological applications, we report a monotonic pH sensitivity of the intracellular fluorescence emission of single-walled carbon nanotube-fluorescein carbazide (SWCNT-FC) conjugates in human ovarian cancer cells. Light-stimulated intracellular hydrolysis of the amide linkage and localized intracellular pH change...

reaction of 2-hydrazinocarbonyl-3-chloro-5-phenoxy-benzo[b] thiophene with different substituted phenyl isothiocyanate gave n-substituted arylthiosemi-carbazide derivatives (1a-h). 1,3,4-thiadiazole derivatives (2a-h) were prepared by the cyclization of arylthiosemicarbazides (1a-h) with concentrated sulphuric acid. all the compounds were screened for their antitubercular activity against mycob...

The absorption and fluorescence spectra of benzanilide (BA) and diphenyl carbazide (DPC) in solvents of different polarities and pH have been analysed. The spectral characteristics of DPC and BA are compared with diphenyl amine molecule. In water and methanol, a dual fluorescence is observed for both DPC and BA molecules. The normal stokes shifted emission originates from a locally excited pi* ...