C2sc00950a 1938..1944
نویسندگان
چکیده
Box-like tetrakis(metalloporphyrin) supramolecular assemblies possessing Zn and Al metal sites can catalyze the methanolysis of phosphate triesters with a high rate enhancement, up to 430 times faster than the uncatalyzed reaction. Mechanistic studies suggest that the observed rate enhancement can be attributed to a high local concentration of methoxide ion that operates in concert with a solvophobically driven encapsulation of substrates by the porphyrinic assembly.
منابع مشابه
The fluorimetric estimation of 3:4-benzpyrene in whole mice.
Hopkins, R. H. (1943). Nature, Lond., 152, 274. Irwin, J. 0. (1944). In the Press. Lyle, T. K., Macrae, T. F. & Gardiner, P. A. (1944). Lancet, 1, 393. Macrae, T. F., Henry, K. M. & Kon, S. K. (1943). Biochem. J. 37, 225. Sebrell, W. H. & Butler, R. E. (1938). Pubi. HUh Rep., Wash., 53, 2282. Snell, E. E. & Strong, F. M. (1939). Industr. Engng Chem. (Anal. ed.), 11, 346. Williams, R. D., Mason,...
متن کاملTreatment of Naga Sore
Sir,?In their excellent paper on Naga Sore, in the January number of the Indian Medical Gazette, Drs. Panja and Ghosh have mentioned my copped sulphate-phenol solution under the heading ?* treatment. May I draw attention to a modification of my original solution, recommended by James (1938), which I have found superior. It consists in the substitution glycerine for water and the formula is as f...
متن کاملA Study of the Intradermal Test of Rotter for Vitamin C Status
was suggested by Rotter (1937). He observed that when 0.01 c.cm. of a N/400 solution of the dye 2 : 6-dichlorophenol indophenol was injected intradermally, the colour of the dye disappeared gradually. When methyl blue was similarly injected, its colour remained unchanged, which showed that the decolorization of dichlorophenol indophenol was not due to resorption but to reduction. Rotter (1938) ...
متن کاملHypercarotenaemia as a symptom of weight phobia.
CAROTENAEMIA is a term coined by Hess & Myers in 1919 who described a yellow pigmentation of the skin which they attributed to the deposition of carotene. Their claim, that there is an accompanying high level of serum carotene, has since been confirmed and the condition is sometimes more accurately called hypercarotenaemia. Thus a number of laboratories, using modifications of Kimble's (1938) m...
متن کاملConjugate Deviation of the Eyes after Cannabis Indica Intoxication.
Cannabis indica or Sativa (also known as Indian hemp and marihuana) is an easily available cheap intoxicant used by certain communities in India. Cannadiol (CG1H3002) and cannabinol (C21H2602) in pure crystalline forms have been isolated from it (Adams, 1942). A highly effective compound similar to tetrahydrocannabinol (Adams, 1942) has been isolated from the natural source (Loewe and Modell, 1...
متن کامل