76
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Babu PA, Narasu ML, Srinivas K. Pyridines, pyridazines and guanines as CDK2 inhibitors: a review. ARKIVOC 2007. [DOI: 10.3998/ark.5550190.0008.208] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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77
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Dubey PK, Reddy PVVP, Srinivas K. A facile tandem synthesis of α-benzyl benzimidazole acetonitriles. ARKIVOC 2007. [DOI: 10.3998/ark.5550190.0008.f19] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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78
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Satyanarayana K, Srinivas K, Himabindu V, Mahesh Reddy G. Impurity profile study of dutasteride. DIE PHARMAZIE 2007; 62:743-746. [PMID: 18236777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
During the process development of dutasteride in the laboratory analysis showed some impurity peaks in HPLC ranging from 0.05 to 0.1%. The same samples were analyzed by LCMS method and identified peak at m/z 508 (desmethyl dutasteride), 530 (dihydro dutasteride) and 528 (isomer of dutasteride). These impurities were synthesized individually and characterized based on the spectroscopic data (HPLC, IR, NMR and MS). The structures of these impurities were 17beta-N-[2,5-bis(trifluoromethyl) phenyl]carbamoyl-3-hydroxyl-4-azaestra-1,3,5,7,9-pentaene (desmethyl of dutasteride 2), 17beta-N-[2,5-bis(trifluoromethyl)phenyl]carbamoyl-4-aza-5alpha-androstane-3-one (dihydro impurity of dutasteride 3), and 17beta-N-[2,5-bis(trifluoromethyl) phenyl] carbamoyl-4-aza-5beta-androst-1-ene-3-one (beta-isomer of dutasteride 4), respectively. The formation and synthesis of dutasteride impurities are discussed.
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79
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Bhaskar G, Prabhakar S, Ramanjaneyulu GS, Vairamani M, Srinivasu VNV, Srinivas K. Mass spectral studies of meso-dialkyl, alkyl aryl and cycloalkyl calix(4)pyrroles under positive and negative ion electrospray ionization conditions. JOURNAL OF MASS SPECTROMETRY : JMS 2007; 42:1194-206. [PMID: 17607800 DOI: 10.1002/jms.1251] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A series of meso-dialkyl, alkyl aryl and cycloalkyl calix(4)pyrroles (1-15) are studied under positive and negative ion electrospray ionization (ESI) conditions. The positive ion spectra show abundant [M + H](+) and [M + Na](+) ions and the negative ion spectra show the [M + Cl](-) (the Cl(-) ions from the solvent) and [M - H](-) ions. The collision induced dissociation (CID) spectra of [M + H](+), [M + Na](+), [M + Cl](-) and [M - H](-) ions are studied to understand their dissociation pathway and compared to that reported for M(+) under electron ionization (EI) conditions. The beta-cleavage process that was diagnostic to M(+) is absent in all the CID spectra of the ions studied under ESI. Dissociation of all the studied ions resulted in the fragment ions formed by sequential elimination of pyrrole (A) and/or dialkyl/alkyl aryl/cycloalkyl (B) groups involving hydrogen migration to pyrrole ring at each cleavage of A--B bond, which clearly reveals the arrangement of A and B groups in the calix(4)pyrroles. The source of hydrogen that migrates to pyrrole ring during A--B bond cleavage is investigated by the experiments on deuterated compounds and [M + D](+) ions; and confirmed that the hydrogen attached to pyrrole nitrogen, hydrogen on alpha-carbon of alkyl group and the H(+)/Na(+) ion that added during ESI process to generate [M + H](+)/[M + Na](+) ions involve in the migration. The yields of [M + Na](+) ions are found to be different for the isomeric meso-cycloalkyl compounds (cycloheptyl, and 2-, 3- and 4-methyl cyclohexyl) and for normal and N-confused calix(4)pyrroles. The isomeric methyl and 3-hydroxy/4-hydroxy phenyl calix(4)pyrroles show specific fragmentation pattern during the dissociation of their [M - H](-) ions.
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80
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Rao AA, Thota H, Gumpeny RS, Akula A, Changalasetty SB, Challa SR, Ravavarapu T, Akula SP, Divakar C, Srinivas K, Das UN. Bioinformatics analysis of diabetic retinopathy using functional protein sequences. Med Hypotheses 2007; 70:148-55. [PMID: 17548166 DOI: 10.1016/j.mehy.2007.03.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Accepted: 03/06/2007] [Indexed: 01/08/2023]
Abstract
Diabetic retinopathy is the leading cause of blindness among patients with diabetes mellitus. We evaluated the role of several proteins that are likely to be involved in diabetic retinopathy by employing multiple sequence alignment using ClustalW tool and constructed a phylogram tree using functional protein sequences extracted from NCBI. Phylogram was constructed using Neighbor-Joining Algorithm in bioinformatics approach. It was observed that aldose reductase and nitric oxide synthase are closely associated with diabetic retinopathy. It is likely that vascular endothelial growth factor, pro-inflammatory cytokines, advanced glycation end products, and adhesion molecules that also play a role in diabetic retinopathy may do so by modulating the activities of aldose reductase and nitric oxide synthase. These results imply that methods designed to normalize aldose reductase and nitric oxide synthase activities could be of significant benefit in the prevention and treatment of diabetic retinopathy.
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81
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Dubey PK, Reddy PP, Srinivas K. Alternate Method for the Synthesis of N‐Alkyl/aralkyl‐2‐(α‐hydroxy Alkyl/aralkyl)benzimidazoles via Regiospecific Acetylation. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397910701265556] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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82
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Rao GV, Reddy MJR, Srinivas K, Reddy MJR, Bushan KM, Rao VJ. Ionic Photodissociation in Arylallyl Acetates¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2002)0760029ipiaa2.0.co2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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83
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Adekanye O, Srinivas K, Collis RE. Bradyarrhythmias in pregnancy: a case report and review of management. Int J Obstet Anesth 2007; 16:165-70. [PMID: 17270418 DOI: 10.1016/j.ijoa.2006.10.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2006] [Revised: 06/01/2006] [Accepted: 10/01/2006] [Indexed: 11/17/2022]
Abstract
We present a case of unpaced pre-existing congenital heart block in pregnancy, diagnosed for the first time in labour. Our patient was asymptomatic and was managed conservatively with temporary pacing equipment on standby. She had a post-partum cardiology follow-up and was paced in the puerperium. We discuss the aetiopathogenesis and the variable presentation patterns of bradyarrhythmia in pregnancy and the multidisciplinary approach to their management. Our recommendations combine the Advanced Life Support algorithm for treatment of bradycardia and the successful management strategies of several documented case reports in the literature.
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84
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Bhaskar G, Prabhakar S, Ravi Kumar M, Narsimhaji CV, Srinivas K, Vairamani M. Characterisation of a series of acetals/ketals of bis(2-nitrophenyl) ethanediol and bis(4,5-dimethoxy-2-nitrophenyl) ethanediol under APCI mass spectrometric conditions. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:1608-14. [PMID: 16830358 DOI: 10.1002/jms.1062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A series acetals/ketals of aldehydes and ketones formed by the reaction of two photolabile protecting groups, bis(2-nitrophenyl) ethanediol and bis(4,5-dimethoxy-2-nitrophenyl) ethanediol (I and II, respectively), were analysed under EI, LSIMS, ESI and APCI conditions to obtain molecular weights as well as structural information. The EI and LSIMS techniques failed to give molecular weight information. The positive ESI yielded [M + H](+) ions only for I; however, with added Na(+) both I and II formed [M + Na](+) adducts. But upon decomposition, the [M + Na](+) ions yielded Na(+) ion as the only product ion. Similarly, under negative ion ESI conditions both I and II gave molecular weight information by forming adduct ions with halide anions (F(-), Cl(-), Br(-) and I(-)); however, they did not give structural information as they resulted in only the halide anion as the abundant fragment ion upon dissociation. All the compounds formed abundant M(-*) ions under negative ion APCI conditions, and their MS/MS spectra showed characteristic fragment ions; hence the acetals/ketals of I and II could be successfully characterized under negative ion APCI conditions.
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85
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Srinivas K, Srinivas U, Bhanuprakash K, Harakishore K, Murthy USN, Rao VJ. Synthesis and antibacterial activity of various substituted s-triazines. Eur J Med Chem 2006; 41:1240-6. [PMID: 16815597 DOI: 10.1016/j.ejmech.2006.05.013] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 05/25/2006] [Accepted: 05/25/2006] [Indexed: 11/29/2022]
Abstract
Series of substituted-s-triazines (1-22) were synthesized and evaluated for their in vitro antibacterial activity against six representative Gram-positive and Gram-negative bacterial strains. Many compounds have displayed comparable antibacterial activity against Bacillus sphaericus and significantly active against other tested organisms with reference to streptomycin.
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86
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Krishna NR, Kumar BR, Srinivas K, Akurati L. A rare congenital anomaly of nose - Accessory nose : Case report. Indian J Otolaryngol Head Neck Surg 2006; 58:389-91. [PMID: 23120359 PMCID: PMC3450355 DOI: 10.1007/bf03049606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
We describe a 21 year old man who was found to have an opening on his external nose since birth. No other clinical and radiological abnormalities were demonstrable elsewhere in his body. The opening is on the lower part of the nose one cm. away from the midline on right side, clinically looking like a sinus. Histological examination of the excised tract showed an organoid structure that was consistent with an"Accessory nose."
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87
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Maitraie D, Yakaiah T, Srinivas K, Venkat Reddy G, Ravikanth S, Narsaiah B, Shanthan Rao P, Ravikumar K, Sridhar B. Regioselective addition of Grignard reagents to 2,6-dicyanoanilines and cyclization to new quinazoline derivatives under thermal/microwave irradiation conditions. J Fluor Chem 2006. [DOI: 10.1016/j.jfluchem.2006.01.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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88
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Srinivas K, Sitha S, Rao VJ, Bhanuprakash K, Ravikumar K. NLO Activity in some non-conjugated 3D triazine derivatives: a non-centrosymmetric crystal through conformational flexibility. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b512362c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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89
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Sitha S, Srinivas K, Raghunath P, Bhanuprakash K, Jayathirtha Rao V. Linear allenic linkage for nonlinear optics: A computational study of the role of mutually orthogonal π-orbitals in controlling the charge transfer, hyperpolarizability and absorption properties in some donor–acceptor substituted allenes. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2005.04.040] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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90
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Srinivas K, Srinivas U, Rao VJ, Bhanuprakash K, Kishore KH, Murty USN. Synthesis and antibacterial activity of 2,4,6-tri substituted s-triazines. Bioorg Med Chem Lett 2005; 15:1121-3. [PMID: 15686925 DOI: 10.1016/j.bmcl.2004.12.020] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2004] [Accepted: 12/06/2004] [Indexed: 11/21/2022]
Abstract
Various 2,4,6-tri substituted s-triazines were synthesized and screened for antibacterial activity against Gram-positive and Gram-negative organisms. These s-triazine derivatives displayed high in vitro antibacterial activities comparable to penicillin and streptomycin against tested microorganisms.
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91
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Srinivas K, Sitha S, Rao VJ, Bhanuprakash K, Ravikumar K, Anthony SP, Radhakrishnan TP. First hyperpolarizability of some nonconjugated donor–acceptor 3D molecules: noncentrosymmetric crystal through conformational flexibility. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b414311f] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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92
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Srinivas K, Snehalatha Nair CK, Ramesh S, Pardhasaraclhi M. AN IMPROVED SYNTHESIS OF 5-(2-FLUOROPHENYL)-1H-TETRAZOLE. ORG PREP PROCED INT 2004. [DOI: 10.1080/00304940409355372] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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93
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Srinivas K, Nair CK, Ramesh S, Pardhasaradhi M. A Rapid and Efficient Synthesis of 2-Butyl-5-Chloro-3H-Imidazole-4-Carboxaldehyde. SYNTHESIS-STUTTGART 2004. [DOI: 10.1055/s-2004-815961] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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94
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Kumar PKD, Vethamony P, Babu MT, Srinivas K, Thottam TJ. Oceanographic studies off Beypore Port, west coast of India to locate a dredge dumping site. ENVIRONMENTAL MONITORING AND ASSESSMENT 2004; 90:269-88. [PMID: 15887376 DOI: 10.1023/b:emas.0000003593.84921.3b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
This study presents the salient results of the oceanographic investigations carried out along the west coast of India to locate a dumping site for the dredged material generated from the capital of the proposed development of the all weather port. Based on the results of movement of disposed material obtained from a 2 dimensional coastal circulation model and considering the possibility of having a navigational channel later on in line with the port, a dumping site is recommended at the 15 m water depth contour with coordinates: Latitude 11 degrees 07.00'; Longitude 75 degrees 45.60', where the environmental impacts on the ecosystem due to dumping operations is considered to be minimum.
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95
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Raghava Rao T, Rao DN, Kumar BV, Aparanji P, Srinivas K, Athota RR. Induction of IgE antibody response by the green seed extract ofVigna sinensis in mice. Indian J Clin Biochem 2003; 18:29-34. [PMID: 23105368 DOI: 10.1007/bf02867662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Sensitization to ingested foods is a known fact and several food allergens have been characterized. It has been observed in our survey that the people complained of allergic symptoms after consumption of the vegetableVigna sinensis. In this study, the experiments were carried to investigate the IgE antibody response against the green seed extract of vigna sinensis in mice and found that the primary, secondary and tertiary immunization with or without adjuvant by different doses induced a significant production of IgE antibodies. The presence of IgE antibodies in the mice sera were determined by passive cutaneous anaphylaxis and enzyme linked immunosorbent assay. It was also confirmed that these allergens were found to be heat resistant and shared a common epitope(s) with the other legume foods, as evidenced by the cross-reactive studies.
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96
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Rao GV, Reddy MJR, Srinivas K, Reddy MJR, Bushan KM, Rao VJ. Ionic photodissociation in arylallyl acetates. Photochem Photobiol 2002; 76:29-34. [PMID: 12126304 DOI: 10.1562/0031-8655(2002)076<0029:ipiaa>2.0.co;2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We have synthesized several 3-arylallyl acetates 1, 2, 3, 5 and 6, and E-3-(1-naphthyl)-2-propene-1-ol 4 for studying ionic photodissociation. Compounds 1, 2 and 3 underwent an efficient ionic photodissociation in polar solvents like acetonitrile and methanol leading to the formation of rearranged acetate and methyl ether products, as well as undergoing an E-Z isomerization. The arylallyl alcohol 4 and the two arylallyl acetates 5 and 6 did not undergo ionic photodissociation. Quantum yields of product formation, quantum yields of fluorescence, solvent polarity effects and triplet-sensitization studies indicated that a highly polarized excited singlet state is responsible for the ionic photodissociation. Both the singlet- and triplet-excited states are effective in displaying E-Z isomerization in 1, 2, 3 and 4. Compounds 5 and 6 are highly fluorescent, and the fluorescence may be the excited state deactivation pathway along with internal conversion.
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97
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Royer JY, Chaubey AK, Dyment J, Bhattacharya GC, Srinivas K, Yatheesh V, Ramprasad T. Paleogene plate tectonic evolution of the Arabian and Eastern Somali basins. ACTA ACUST UNITED AC 2002. [DOI: 10.1144/gsl.sp.2002.195.01.02] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractWe review previous models for the Paleogene tectonic evolution of the Arabian and Eastern Somali basins and present a model based on a new compilation of magnetic and gravity data. Using plate reconstructions, we derive a self-consistent set of isochrons for Chron 27 to Chron 21 (61–46 Ma). The new isochrons account for the development of successive ridge propagation events along the Carlsberg Ridge, leading to an important spreading asymmetry between the conjugate basins. Our model predicts the growth of the outer and inner pseudofaults associated with the ridge propagation events. The location of outer pseudo-faults appears to remain very stable despite a drastic change in the direction of ridge propagation before Chron 24 (c. 54 Ma). The motion of the Indian plate relative to the Somalian plate is stable in direction through Paleogene time; spreading velocities decrease from 6 to 3 cm a−1. Our reconstructions also confirm that the Arabia-India plate boundary was located west of the Owen Ridge along the Oman margin during Paleogene time; some compression is predicted at about Chron 21 (47 Ma) between the Indian and Arabian plates.
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98
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Abstract
Reports on the effects of dividing attention at study on subsequent perceptual priming suggest that perceptual priming is generally unaffected by attentional manipulations as long as word identity is processed. We tested this hypothesis in three experiments by using the implicit word fragment completion and word stem completion tasks. Division of attention was instantiated with the Stroop task in order to ensure the processing of word identity even when the participant's attention was directed to a stimulus attribute other than the word itself. Under these conditions, we found that even though perceptual priming was significant, it was significantly reduced in magnitude. A stem cued recall test in Experiment 2 confirmed a more deleterious effect of divided attention on explicit memory. Taken together, our findings delineate the relative contributions of perceptual analysis and attentional processes in mediating perceptual priming on two ubiquitously used tasks of word fragment completion and word stem completion.
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99
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Mehta G, Srinivas K. Enantioselective total syntheses of the novel tricyclic sesquiterpene hydrocarbons (+)- and (−)-kelsoene. Absolute configuration of the natural product. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00288-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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100
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Srinivas K, Singh K. Combination of autologous Transfusion and Retrograde Autologous Priming Decreases Blood Requirements. Ann Card Anaesth 2001; 4:28-32. [PMID: 17851159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023] Open
Abstract
In a prospective study, 60 patients posted for coronary artery bypass graft (CABG) surgery on cardiopulmonary bypass (CPB) were assigned to 2 groups of 30 each. (group A =combination of acute normovolaemic haemodilution (ANH) and retrograde autologous priming (RAP), group B=control). The aim was to investigate whether retrograde autologous priming reduces haemoditution as compared to control cases. Patients who had a history of previous cardiac surgery and patients with severe left ventricular dysfunction, were excluded. Group A patients were subjected to pre-CPB intraoperative autologous blood collection prior to heparin administration. Heparin was given (300IU/Kg) and the aorta was cannulated. In addition, prior to bypass, if the patients had a systolic BP>100 mm Hg, 300cc of their blood was withdrawn in a retrograde manner via aortic cannula into the CPB circuit up to the arterial filter, while the 'displaced' asanguinous prime was diverted into a transfer bag. The total bank blood (whole blood) used intra-op was 26 units in the study group [mean 0.86 unit per patient] versus 52 units in the control group (mean 1.73 units per patient) (P<0.001). Blood components and products were not used in this study. The average fall in haematocrit (Hct) on CPB was 27.03% in the study group versus 39.5% in the control group (P < 0.001). Thus retrograde autologous griming in combination with autologus transfusion significantly reduces the need for bank blood.
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