In the preparation of benzobisthiazoles from m- and p-phenylenediamines by thiocyanation or by ring closure of derived thioureas the linear tricyclic compound is usually the major or the only product. 3,6-Diamino-1,2-phenylene di(hydrogen thiosulphate)(the so-called p-phenylenediamino-2,5-bisthiosulphuric acid) is the 2,3-isomer and correction is required to structures assigned to its derivatives,
Thermally stable cytosine deaminase (CDase), and the gene coding therefor, is disclosed as well as methods of isolating, purifying, and recombinantly producing the same. The thermally stable CDase can be isolated from Saccharomyces cerevisiae. The yeast isolated enzyme has a molecular weight of approximately 32 kDa, as determined by gel filtration chromatography, and is composed of two subunits, each with a molecular weight of about 17 kDa. Thermally stable yeast CDase so purified shows no significant sequence homology with other known sequenced proteins.
本研究公开了热稳定胞嘧啶脱氨酶(CDase)及其编码基因,以及分离、纯化和重组生产这种酶的方法。热稳定 CD 酶可以从酿酒酵母中分离出来。经凝胶过滤色谱法测定,酵母分离酶的分子量约为 32 kDa,由两个亚基组成,每个亚基的分子量约为 17 kDa。如此纯化的热稳定酵母 CD 酶与其他已知测序蛋白没有明显的序列同源性。
A method for separating Diphenylurea(DPU) and phenylthiohydantoin-tryptophan (PTH-TRP) allowing unambiguous indentification of TRP in automatic sequence analysis
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0447746A1
公开(公告)日:1991-09-25
A reverse-phase HPLC method is disclosed which allows the separation of DPU and PTH-Trp and, therefore, the correct assignment of tryptophan residues in an amino acid sequence. The method is based on a modification of the conventional HPLC gradient commonly used to elute and separate all PTH amino acids of interest in automated and manual sequencing. In one embodiment, using automated instruments manufactured by Applied Biosystems, gradient modification is achieved by changing the manufacturer-supplied gradient program which controls the operation of the HPLC pumps in the instrument. Using the methods of the present invention, the correct and reliable assignment of tryptophan residues is possible and was reproducible over time, even with small sample sizes.
A power transmission belt comprising rubber parts, at least one of which comprises a rubber composition containing a thiourea compound represented by the general formula (I):
wherein each of R1, R2, R3 and R4 is independently hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, and at least three of said R1, R2, R3 and R4 are hydrocarbon groups having 1 to 12 carbon atoms in an amount of 0.1 to 2.5 parts by weight based upon 100 parts by weight of sulfur-modified chloroprene rubber. The power transmission belt of the present invention inhibits the generation of strange sound during working of the belt and shows long span of belt life.
This invention is related to a power transmission belt comprising a bottom rubber layer comprising an elastomer,
wherein the bottom rubber layer satisfies the relation represented by the following formula (1) :X/Y≧2.5 , in the formula, X is the change in mg in the weight of said layer after 500 wear cycles under a load of 500 grams in Taber's abrasion resistance test with a sand paper (C1500) having a particle size of 10 µm as the counter material and Y is the area in cm2 of contact between said counter material and the rubber face of the belt.