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Search Results: 1 - 10 of 401220 matches for " M. KRISHNAIAH "
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Wind Motions around the Tropical Cirrus Using Simultaneous Radar and Lidar Observations over Gadanki (13.45°N, 79.18°E), India  [PDF]
C. Dhananjaya Rao, M. Arunachalam Srinivasan, M. Krishnaiah, Y. Bhavani Kumar, S. V. B. Rao
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.511103
Abstract: The present study describes variation of peak linear depolarization ratio (LDR) with wind around the cloud altitude using simultaneous observation of winds and cirrus cloud for the first time using Indian MST radar and polarization lidar co-located over a low latitude station Gadanki (13.7°N and 79.2°E). Three different cases of passage of the cirrus at different altitudes are noticed, one during a North-East monsoon day and other two during South-West monsoon days. The zonal wind below the cloud height has shown similar variation with LDR during 02 November 2006 and the meridional wind within the cloud height during 25 July 2007 and 08 June 2006 has shown opposite variation with LDR. Even though there is a significant increase in zonal wind due to the existence of tropical easterly jet (TEJ) above cloud height during 25 July 2007 and 08 June 2006, also, the vertical wind is found to be continuously varying during 25 July 2007 and it is upward dominant in the initial stage and is mostly downward in the later stage of observation on 08 June 2006, there is a slight descent in cloud altitude only during 25 July 2007. Thus, the wind above the cloud height alone may not affect the ascent/descent of the cloud top altitude. The potential temperature gradient is high within the cloud heights when the cirrus present near the cold point tropopause indicates the maximum air-mass mixing near the tropopause.
Enantioseparation of Palonosetron Hydrochloride and Its Related Enantiomeric Impurities by Computer Simulation and Validation  [PDF]
M. Vishnu Murthy, C Krishnaiah, Kodithyala Jyothirmayi, Katkam Srinivas, K Mukkanti, Ramesh Kumar, Gautam samanta
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.24053
Abstract: A rapid, simple and single stereo selective high-performance liquid chromatographic (HPLC) method was developed and validated for enantiomers of palonosetron hydrochloride (PALO) and its process related chiral impurities. A computer simulating software was used for the development of chiral method. The developed method was able to separate not only the enantiomers of palonosetron hydrochloride but also its process related chiral impurities within 12 min. The chromatographic separation was carried out by normal phase chromatography using a 3 µm column of cellulose based chiral stationary phase (Chiralcel-OD 250mm × 4.6mm) with a mobile phase comprised of n-hexane: ethanol: methanol: heptafluoro butyric acid: diethyl amine (70:15:15:0.05:0.1, v/v) at a flow rate of 1.0 mL/min. The effects of additive concentration as well as nature of polar organic modifier, flow rate, and temperature on enantioselectivity were investigated. The limit of detection (LOD) and limit of quantification (LOQ) of the palonosetron isomers and its related chiral impurities were found to be in the range 0.06-0.10 µg/mL and 0.14 - 0.24 µg/mL respectively. The method showed excellent linearity (R2 > 0.998) over a range of 0.14 to 1.125 µg/mL. The percentage recovery of the isomers in bulk drug samples ranged from 87.0 to 116.0.
M. Krishnaiah,R. Ravi Kumar,Thanzaw Oo,Pho Kaung
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809034254
Abstract: The title compound, C15H10ClNO, is a functionalized isoxazole with a chlorophenyl and a phenyl substitutent. The mean plane of the isoxazole ring is inclined to those of the two benzene ring mean planes by 38.32 (16) and 43.91 (18)°.
3-(6-Methyl-2-pyridyl)-2-phenoxy-3,4-dihydro-1,3,2-benzoxazaphosphirine 2-oxide
Rajni Kant,Sabeta Kohli,Lovely Sarmal,M. Krishnaiah
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809029018
Abstract: In the title compound, C19H17N2O3P, the six-membered 1,3,2-oxazaphosphorine ring adopts a twist-boat conformation with the phosphoryl O atom in an equatorial position. The P=O(oxide) bond length is 1.457 (1) and the average value of the P—O distances is 1.588 . The crystal structure is stabilized by C—H...O and C—H...π interactions.
R. Ravi Kumar,M. Krishnaiah,Thanzaw Oo,Pho Kaung
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809041300
Abstract: In the title compound, C18H13ClO4S, the mean planes of the chlorophenyl ring and the S—C=C—C chain are oriented at angles of 52.7 (2) and 51.3 (2)°, respectively, with respect to the sulfonyl (O=S=O) plane. The dihedral angle between the mean planes of the chlorophenyl group and the benzopyran ring is 80.7 (1)°. The crystal structure is stabilized by two intermolecular C—H...O interactions, forming centrosymmetrc dimers, which are linked via a second C—H...O interaction into a chain structure.
2-Bromo-1,2-diphenylethenyl 4-methylphenyl sulfoxide
M. Krishnaiah,R. Ravi Kumar,Thanzaw Oo,Thetmar Win
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809042184
Abstract: In the title compound, C21H17BrO2S, the two phenyl rings attached to the ethene group are oriented at dihedral angles of 76.19 (10) and 57.99 (8)° with respect to the Br—C=C—S plane [r.m.s. deviation 0.003 ]. The sulfonyl-bound phenyl ring forms a dihedral angle of 83.26 (8)° with the above plane. The crystal structure is stabilized by weak C—H...π interactions.
Journal of Sustainability Science and Management , 2007,
Abstract: Nowadays, insect repellents are widely used by consumers, especially insect repellents that are produced from natural-based such as citronella, as insects especially mosquitoes are well-known as disease carriers to human. Since the component of insect repellents could not be applied directly to human skin, base cream with insect repellent need to be formulated. The quality of the base cream is directly linked to the basic material used in the formulation. Varying the ratio of the ingredient used determines the final products characteristics. In this work, various compositions of carbopol, triethylamide, glycerine, water, and ethanol were used to prepare the base cream formulations. D-optimal mixture design was performed to obtain the optimum formulation. Twenty-five combination components were selected according to the D-optimal criterion. The consumer acceptance and physical properties of the base cream such as viscosity, drying time stickiness were studied. Three-dimensional surface plots were formed to assess the change in the response surface and to understand the effect of the mixture composition on lipstick characteristics. The result indicates that there are relationships between the processing variables of the lipstick formulation and the consumer acceptance.
Indo-Japanese Lidar Observations of the Tropical Middle Atmosphere During 1998 and 1999

大气科学进展 , 2006,
Abstract: A state-of-the art Rayleigh and Mie backscattering lidar was set up at Gadanki (13.5°N, 79.2°E) in the Tropics in India. Using this system, regular observations of upper tropospheric clouds, aerosols at stratospheric heights and atmospheric temperatures in the range from 30 to 80 km were made. In this paper, the data collected during the period of 1998-99 were selected for systematic investigation and presentation. The Mie scattering lidar system is capable of measuring the degree of depolarization in the laser backscattering. Several tropical cirrus cloud structures have been identified with low to moderate ice content. Occasionally, thin sub-visible cirrus clouds in the vicinity of the tropical tropopause have also been detected. The aerosol measurements in the upper troposphere and lower stratosphere show low aerosol content with a vertical distribution up to 35 km altitude. Rayleigh-scattering lidar observations reveal that at the tropical site, temperature inversion occurs at mesospheric heights. Atmospheric waves have induced perturbations in the temperatures for several times at the upper stratospheric heights. A significant warming in the lower mesosphere associated with a consistent cooling in the upper stratospheric heights is observed particularly in the winter season during the events of sudden stratospheric warming (SSW).
Chemical and Bioprocess Engineering: A Special Issue of Journal of Applied Sciences
Duduku Krishnaiah
Journal of Applied Sciences , 2007,
Abstract: ICCBPE-2005/SOMChE conference discussed the recent developments in chemical and bioprocess engineering. In this introduction to the special issue dedicated to the conference, an overview of selected papers outlined.
3-(6-Methyl-2-pyridyl)-2-phenyl-3,4-dihydro-1,3,2-benzoxazaphosphinine 2-oxide
V. H. H. Surendra Babu,M. Krishnaiah,M. Anil Kumar,C. Suresh Reddy
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809040367
Abstract: In the title compound, C19H17N2O2P, the six-membered 1,3,2-oxazaphosphinine ring adopts a boat conformation with the phosphoryl O atom in an equatorial position. The dihedral angle between the 6-methyl-2-pyridyl and phenyl groups is 75.5 (1)°. These substituents are trans to each other, and are oriented at angles of 57.2 (1) and 74.8 (1)°, respectively, to the benzene ring. The crystal structure is stabilized by intra- and intermolecular hydrogen bonds. The phosphoryl O atom participates in intermolecular C—H...O interactions with the neighbouring molecules, forming centrosymmetric R22(14) dimers.
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