منابع مشابه
Infra-red Absorption Spectra of Steroids
In this paper, the infra-red absorption spectra of a number of crystalline natural estrogens are presented and considered in relation to chemical structure. As a group, the natural estrogens are distinguished chemically from other steroids by the benzenoid structure of Ring A, which gives rise to certain infra-red absorption bands by which their spectra may be differentiated from those of other...
متن کاملInfra-red Absorption Spectra of Pyrylium Salts
The infra-red absorption spectra of the unsubstituted pyrylium cation and of 25 di-, tri-, tetraand per&-substituted pyrylium salts (mostly perchlorates) with alkyl and/or phenyl groups are described. Assignments of IR bands are made in correlation with the spectrum of pyridine, and the variation of band position and intensity depending on substitution is discussed. Implications for the assignm...
متن کاملInfra-Red Absorption Spectra of Chlorophylls and Derivatives.
We have measured the infra-red absorption spectra of chlorophyll and some of its derivatives in order to obtain information useful for eventual understanding of reversible transformations of this pigment. Such transformations are (a) Moliseh phase test, (b) bleaching by FeCl3, and (c) photochemical reduction by ascorbic acid-"Krasnovsky reaction" (10, 13, 16). Only in the case of the phase test...
متن کاملMinimizing Strong Telluric Absorption in Near Infra-red Stellar Spectra
We have obtained high resolution spectra (R ∼ 25000) of an A star over varying airmass to determine the effectiveness of telluric removal in the limit of high signal to noise. The near infra-red line He I at 2.058μm, which is a sensitive indicator of physical conditions in massive stars, supergiants, H II regions and YSOs, resides among pressure broadened telluric absorption from CO2 and water ...
متن کاملThe Absorption Spectra of Hemoglobin and Its Derivatives in the Visible and near Infra-red Regions
Since the pioneering investigations of Vierordt and of Hiifner and his group, numerous reports on the absorption spectra of hemoglobin and its derivatives have appeared in the literature. A detailed summary of these reports is to be found in Heilmeyer’s monograph (1). For the most part these investigations have been confined to the visible portion of the spectrum, although in a few cases the ob...
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ژورنال
عنوان ژورنال: Journal of the Fuel Society of Japan
سال: 1958
ISSN: 0369-3775,2185-226X
DOI: 10.3775/jie.37.643