A quantitative colorimetric sensing strategy utilizing cysteamine modified gold nanoparticles (CA-AuNPs) as reporters for Hg(2+) and melamine was demonstrated. Cysteamine is a cheap and commercially available aminothiol and is also the most important chelating ligand in coordination chemistry possessing the ability to coordinate to Hg(2+) and melamine. The terminal thiol group in cysteamine is ...

The aim of this study was to assess the effect of oocyte selection using the brilliant cresyl blue (BCB) test plus the addition of cysteamine to the in vitro maturation (IVM) medium to improve the in vitro embryo development of prepubertal goat oocytes. The oocytes were exposed to 26 microM BCB and classified according to their cytoplasm coloration: BCB+ (oocytes with blue cytoplasm) and BCB- (...

A new isoenzyme of alkaline phosphatase (EC 3.1.3.1) has been reported to occur in sera from patients with lymphoproliferative diseases. This enzyme is character ized by an inability to hydrolyze cysteamine S-phosphate. We find that the 5,5 -dithobis(2-nitrobenzoic acid)-coupled assay method for cysteamine S-phosphate hydrolysis is not suitable for serum, and we were unable to confirm the exist...

Singleand double-stranded (RF) DNA of page <?X-174 were 60Co-gamma irradiated. Depen­ dence of radiosensitivity on the concentration of cysteamine and cystamine was measured. Radio­ resistance of DNA in vivo (phage particles) as well as of DNA in vitro (infectious DNA) increase between 10-4 and 10—1 M of superprotective agents. The same relationship is observed when the DNA is in the dry and in...

Objective: The plant Ocimum basilicum belonging to family Lamiaceae is used in Skin disease, eye disease, fever and wounds. The present study was carried out to evaluate the effect of Ocimum basilicum whole plant (ethanolic and aqueous extract p.o.) on gastric and duodenal ulceration. Materials and Methods: The study was carried out on duodenal ulceration models such as cysteamine induced ulcer...

The enzyme oxidizing cysteamine to hypotaurine has been extracted from horse kidney and purified. The final product behaves as a single protein when analyzed in the ultracentrifuge, by starch gel electrophoresis, and by filtration on dextran gels. The sedimentation coefficient of the pure product is s2o, = 5.9. The molecular weight determined by the Yphantis procedure (22) is 83,000. Nonheme ir...

中村 泉:東 京大学理学部動物学教室,東 京都文京区本郷7-3-1,〒113 * Present address : Department of Hygiene, Teikyo University School of Medicine, Tokyo 173 The effect of cysteamine on the fluctuation of X-ray sensitivity during early cleavage stage of sea urchin eggs expressed by pluteus formation rate was examined. Sea urchin eggs were very resistant to radiation immediately after insemination or after S phase of the c...

A flexible nanoparticle-based sulfate assay is demonstrated in which the positively-charged gold nanoparticles (cysteamine-AuNPs) act as indicator. The aggregation of cysteamine-AuNPs is selectively induced by sulfate, which allows the rapid colorimetric sensing of sulfate without any precipitant, sample preparation and specific instruments. In this work, the cysteamine-AuNPs probe has been suc...

Background: The use of C-type natriuretic peptide (CNP) combined with cysteamine during pre-in vitro maturation (IVM) can help establish an effective pre-IVM system. Aims: This study was designed to investigate the effects of CNP combined with cysteamine on meiotic maturation and developmental competence of bovine oocytes in vitro. Met...

Chinese hamster ovary cells were exposed to the sulfhydryl compound cysteamine at different temperatures (5 degrees C, 37 degrees C, 44 degrees C) at concentrations known to generate activated oxygen species. At 37 degrees C, the cellular glutathione (GSH) content increased linearly over the time of drug exposure (2 h) as compared to untreated cells or to cells kept at 5 degrees C during drug t...