Raman spectrum of hydroxylamine hydrochloride (NH3OH.Cl)Krishnan, R.; Balasubramanian, K.
doi: 10.1007/BF03046442pmid: N/A
The Raman spectrum of hydroxylamine hydrochloride (NH3OH.Cl) in the form of a single crystal has been photographed usingλ 2536·5 excitation. 32 Raman lines with frequency shifts 40, 57, 78, 88, 111, 125, 135, 156, 187, 217, 250, 330, 550, 575, 1004, 1168, 1204, 1470, 1496, 1565, 1590, 1979, 2636, 2710, 2750, 2789, 2926, 2970, 3000, 3050, 3141 and 3220 cm.−1 have been recorded. Of these, the first 8 low-frequency lines belong to the external oscillation, while the four lines at 187, 217, 250 and 330 cm.−1 should be attributed to the vibrations of the hydrogen bond valence vibrations. The remaining Raman lines have been assigned to the vibrations of the NH3OH ion. The O-H and N-H stretching vibrations are very much influenced by the presence of the hydrogen bonds in the crystal.
Spectrophotometric and potentiometric investigations of copper (II)-ethanolamine complexesMahapatra, S.; Subrahmanya, R.
doi: 10.1007/BF03046444pmid: N/A
Potentiometric, spectrophotometric and polarographic evidence has been presented for the formation of mixed hydroxy complexes in coppermonoethanolamine system. A method has been developed for the analysis of Bjerrum formation curves taken in presence of 0·1, 0·2, 0·5 and 1·0 M monoethanolammonium ion with respect to hydroxy complexes. The formation of CuAOH+, CuA2OH+ and CuA3OH+ is shown and the corresponding stability constants are calculated at different concentrations of MEA ion. Curves showing the distribution of pure and hydroxy complexes at various pA values in solutions containing different concentrations of MEA ion have also been given.
Ripple marks in alwar quartzites east of mera ka gurha near udaipur, rajasthanVerma, V.
doi: 10.1007/BF03046445pmid: N/A
The present note includes a brief account of the ripple marks in the Alwar quartzites of an area East of the village Mera Ka Gurha near Udaipur. Both symmetrical and asymmetrical types of ripple marks have been noticed. In the case of asymmetrical ripples, the ripple index and the horizontal form index have been dealt with in detail. An attempt is made to decipher the palaeogeographical, ecological and other conditions that were present at the time of formation of the ripples.
On the day airglowGhosh, S.; Sharma, K.
doi: 10.1007/BF03046446pmid: N/A
The altitude variation of the intensity ofλ 6300 line of OI atom and that ofλ 3914 (0–0 band of the first negative system of N
2
+
) in the day airglow have been calculated. It has been found that photodissociation of O2 by the Schumann-Range continuum is mainly responsible for the emission ofλ 6300 line (intensity 65 KR). Emission produced by dissociative recombination of O
2
+
and NO+ ions with electrons is of less importance (intensity 22 KR). The low intensity ofλ 6300 line during a solar eclipse, when the photo dissociation process is absent, is in conformity with the intensity (<6 KR) obtained by Tanabe and Tohmatsu (1959). Assuming that the resonance fluorescence is responsible for the emission ofλ 3914 band, the intensity of this band is calculated. The calculated intensity (7 KR) is within the limits of the values (>1 KR and <70 KR) obtained from theoretical considerations by Chamberlain and Sagan (1960).
Stereochemical criteria for polypeptide and protein chain conformationsRamakrishnan, C.
doi: 10.1007/BF03046447pmid: N/A
A large number of configurations are possible for a polypeptide structure depending upon the relative orientations of the two peptide groups linked at anα-carbon atom. If the linkages at theα-carbon atoms are identical, then the structure assumes a regular helical form. Such a regular helical structure can be specified by two parametersφ, φ′ which are the angles of rotation of the two groups about the N—αC andαC—C′ bonds meeting at anα-carbon atom. In this paper, a method of evaluating the helical parameters of a structure, namely, the number of residues per turnn, the unit translation along the axis of the helixh and the direction cosines of the helical axis with respect to a suitably chosen co-ordinate system, is described making use of rotation matrices. The evaluation has been done for three different values of the angle
$$N\widehat{aC}C'$$
at theα-carbon atom, namely, 105°, 110° and 115°. The results are shown graphically in the form of curves for constantn and constanth in theφ − φ′ plane.