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Dababneh H, Sivakumar K, Sibharwal T, Kumar R, Jain G, Tiwari A, Arcot K, Farkas J. E-063 validation of the interventional stroke assessment scale for eligibility in endovascular therapy (isas-et). J Neurointerv Surg 2015. [DOI: 10.1136/neurintsurg-2015-011917.138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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77
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Prakash E, Sivakumar K. Experimental Analysis of Damping and Tribological Characteristics of Nano- CuO Particle Mixed Lubricant in Ball Bearings. INTERNATIONAL JOURNAL OF NANOSCIENCE 2015. [DOI: 10.1142/s0219581x14500264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Experimental analysis of damping capacity and tribological characteristics of nano CuO added Servosystem 68 lubricant is attempted. CuO nano particles were synthesized by aqueous precipitation method and characterized. Prior to dispersion into lubricant, CuO nano particles were coated with 0.2 wt.% surfactant (Span-80) to stabilize the nano fluid. Tribological characteristics of particle added lubricant were tested in ASTM D 4172 four ball wear tester. Scanning electron microscopy test results of worn surfaces of nano CuO particle added lubricant were smoother than base lubricant. The particle added lubricant was applied in a new ball bearing and three defected ball bearings. When particle added lubricant was used, the ball defected bearing's vibration amplitude was reduced by 21.94% whereas it was 16.46% for new bearing and was ≤ 11% for other defected bearings. The formation of protection film of CuO over ball surface and regime of full film lubrication near the ball zone were observed to be reason for improved damping of vibrations.
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Jagan R, Sathya D, Sivakumar K. A dihydrogen phosphate anionic network as a host lattice for cations in 1-methylpiperazine-1,4-diium bis(dihydrogen phosphate) and 2-(pyridin-2-yl)pyridinium dihydrogen phosphate-orthophosphoric acid (1/1). Acta Crystallogr C Struct Chem 2015; 71:374-80. [PMID: 25940893 DOI: 10.1107/s2053229615006518] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 03/31/2015] [Indexed: 11/10/2022] Open
Abstract
In the salt 1-methylpiperazine-1,4-diium bis(dihydrogen phosphate), C5H13N2(2+)·2H2PO4(-), (I), and the solvated salt 2-(pyridin-2-yl)pyridinium dihydrogen phosphate-orthophosphoric acid (1/1), C10H9N2(+)·H2PO4(-)·H3PO4, (II), the formation of O-H...O and N-H...O hydrogen bonds between the dihydrogen phosphate (H2PO4(-)) anions and the cations constructs a three- and two-dimensional anionic-cationic network, respectively. In (I), the self-assembly of H2PO4(-) anions forms a two-dimensional pseudo-honeycomb-like supramolecular architecture along the (010) plane. 1-Methylpiperazine-1,4-diium cations are trapped between the (010) anionic layers through three N-H...O hydrogen bonds. In solvated salt (II), the self-assembly of H2PO4(-) anions forms a two-dimensional supramolecular architecture with open channels projecting along the [001] direction. The 2-(pyridin-2-yl)pyridinium cations are trapped between the open channels by N-H...O and C-H...O hydrogen bonds. From a study of previously reported structures, dihydrogen phosphate anions show a supramolecular flexibility depending on the nature of the cations. The dihydrogen phosphate anion may be suitable for the design of the host lattice for host-guest supramolecular systems.
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79
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Venkatramana L, Gardas RL, Narasimha Rao C, Sivakumar K, Reddy KD. A Study of the Excess Properties of Aliphatic Chlorinated Compounds with Benzylalcohol at Various Temperatures. J SOLUTION CHEM 2015. [DOI: 10.1007/s10953-015-0309-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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80
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Vasundhara P, Narasimha Rao C, Venkatramana L, Sivakumar K, Venkateswarlu P, Gardas R. Thermodynamic properties of binary mixtures of aniline with halogenated aromatic hydrocarbons: Measurements and correlations. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2014.12.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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81
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Prema D, Sivakumar K. Inclusion Complexation of Acetanilide into the β-Cyclodextrin Nanocavity: A Computational Approach. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.mspro.2015.06.083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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82
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Muralidharan J, Jayachandran S, Thiruvenkadan A, Singh DAP, Sivakumar K. Effect of concentrate and urea molasses mineral block supplementation on the blood biochemistry of off season Mecheri lambs. INDIAN J ANIM RES 2015. [DOI: 10.5958/0976-0555.2015.00070.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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83
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Sukumar G, Singh BB, Bhattacharjee A, Sivakumar K, Gogia A. Effect of Heat Treatment on Mechanical Properties and Ballistic Performance of Ti-4Al-2.3V-1.9Fe Alloy. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.matpr.2015.07.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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84
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Mahmoudi G, Stilinović V, Gargari MS, Bauzá A, Zaragoza G, Kaminsky W, Lynch V, Choquesillo-Lazarte D, Sivakumar K, Khandar AA, Frontera A. From monomers to polymers: steric and supramolecular effects on dimensionality of coordination architectures of heteroleptic mercury(ii) halogenide–tetradentate Schiff base complexes. CrystEngComm 2015. [DOI: 10.1039/c5ce00382b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis and X-ray characterisation of six mercury(ii) halogenide–tetradentate Schiff base complexes.
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Sivakumar K, Senthil Kumar V, Shim JJ, Haldorai Y. Poly(aniline-co-o-toluidine) Encapsulated Zinc Oxide Nanocomposite: Preparation, Characterization, and Photocatalytic Reduction of Cr(VI). ACTA ACUST UNITED AC 2014. [DOI: 10.1080/15533174.2014.965112] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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86
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Periasamy R, Kothainayaki S, Rajamohan R, Sivakumar K. Spectral investigation and characterization of host–guest inclusion complex of 4,4′-methylene-bis(2-chloroaniline) with beta-cyclodextrin. Carbohydr Polym 2014; 114:558-566. [DOI: 10.1016/j.carbpol.2014.08.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 08/05/2014] [Accepted: 08/06/2014] [Indexed: 11/25/2022]
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87
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Ganapathy Selvam G, Sivakumar K. Phycosynthesis of silver nanoparticles and photocatalytic degradation of methyl orange dye using silver (Ag) nanoparticles synthesized from Hypnea musciformis (Wulfen) J.V. Lamouroux. APPLIED NANOSCIENCE 2014. [DOI: 10.1007/s13204-014-0356-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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88
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Vijayalakshmi D, Narasimha Rao C, Gowrisankar M, Sivakumar K, Venkateswarlu P. Densities, viscosities and speeds of sound of binary mixtures of ethyl benzoate with toluene, and isomeric chlorotoluenes at different temperatures. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.05.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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89
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Sivakumar K, Senthil Kumar V, Shim JJ, Haldorai Y. Conducting Copolymer/ZnO Nanocomposite: Synthesis, Characterization, and Its Photocatalytic Activity for the Removal of Pollutants. ACTA ACUST UNITED AC 2014. [DOI: 10.1080/15533174.2013.809743] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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90
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Periasamy R, Rajamohan R, Kothainayaki S, Sivakumar K. Spectral investigation and structural characterization of Dibenzalacetone: β-Cyclodextrin inclusion complex. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.04.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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91
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Selvam GG, Sivakumar K. Influence of seaweed extract as an organic fertilizer on the growth and yield of Arachis hypogea L. and their elemental composition using SEM–Energy Dispersive Spectroscopic analysis. ASIAN PACIFIC JOURNAL OF REPRODUCTION 2014. [DOI: 10.1016/s2305-0500(13)60179-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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92
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Stalin T, Srinivasan K, Sivakumar K. Study of the cyclodextrin and its complexation with 2,4-dinitrobenzoic acid through photophysical properties and 2D NMR spectroscopy. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.11.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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93
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Sivakumar K, Nichodemus M, Sankaran K. Steric effect is a decisive factor on the orientation preference of guest into host: evidence from 5-indanol/β-CD model. Mol Phys 2014. [DOI: 10.1080/00268976.2013.868057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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94
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Abraham J, Ramesh Saravanakumar V, Kulkarni VV, Sivakumar K, Singh AP, Visha P. Yield and Quality Characteristics of Rendered Chicken Oil for Biodiesel Production. J AM OIL CHEM SOC 2013. [DOI: 10.1007/s11746-013-2346-5] [Citation(s) in RCA: 3] [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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95
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Sivakumar K, Bari MF, Adaikalakoteswari A, Guller S, Weickert MO, Randeva HS, Grammatopoulos DK, Bastie CC, Vatish M. Elevated fetal adipsin/acylation-stimulating protein (ASP) in obese pregnancy: novel placental secretion via Hofbauer cells. J Clin Endocrinol Metab 2013; 98:4113-22. [PMID: 23956345 PMCID: PMC3790615 DOI: 10.1210/jc.2012-4293] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT AND OBJECTIVE Obesity in pregnancy is associated with increased risks of obesity in the offspring. We investigated the relationship between obesity in pregnancy and circulating maternal and fetal levels of adipose tissue-derived factors adipsin and acylation stimulating protein (ASP) in lean and obese mothers. DESIGN Paired peripheral and cord blood samples were taken. Paired fat and placenta tissue were taken for explant culture. Media were assayed for secreted adipsin and ASP. Clinical parameters assayed included fasting insulin, glucose, and adipsin. SETTING The study was conducted at a university hospital maternity unit. PATIENTS Patients included 35 lean [body mass index (BMI) 19-25 kg/m(2), mean age 32 years and 39 obese (BMI) > 30 kg/m(2), mean age 32.49 years] pregnant Caucasian women, delivered by cesarean section at term. MAIN OUTCOME MEASURE Identification of placental macrophages [Hofbauer cells (HBCs)], as a source of adipsin and ASP was determined. RESULTS HBCs secreted both adipsin and ASP. Cord levels of adipsin (1663.78 ± 52.76 pg/mL) and ASP (354.48 ± 17.17 ng/mL) were significantly elevated in the offspring of obese mothers compared with their lean controls [1354.66 ± 33.87 pg/mL and 302.63 ± 14.98 ng/mL, respectively (P < .05 for both)]. Placentae from obese mothers released significantly more adipsin and ASP than placentae from lean mothers [546.0 ± 44 pg/mL · g vs 284.56 ± 43 pg/mL · g and 5485.75 ± 163.32 ng/mL · g vs 2399.16 ± 181.83 ng/mL · g, respectively (P < .05 for both)]. Circulating fetal adipsin and ASP positively correlated with maternal BMI (r = 0.611, P < .0001, and r = 0.391, P < .05, respectively). Fetal adipsin correlated positively with maternal (r = 0.482, P < .01) and fetal homeostasis model assessment of insulin resistance (r = 0.465, P < .01). CONCLUSIONS We demonstrate novel secretion of adipsin and ASP by placental HBCs.
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96
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Venkatramana L, Sivakumar K, Govinda V, Dayananda Reddy K. Study on solution properties of some industrially important solvents with an aromatic alcohol. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2013.04.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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97
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Paramasivaganesh K, Srinivasan K, Manivel A, Anandan S, Sivakumar K, Radhakrishnan S, Stalin T. Studies on inclusion complexation between 4,4′-dihydroxybiphenyl and β-cyclodextrin by experimental and theoretical approach. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.04.072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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98
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Sathya D, Jagan R, Padmavathy R, Kumar RM, Sivakumar K. N-H∙∙∙O, O-H∙∙∙O hydrogen-bonded supramolecular sheet formation in the bis(2-aminoanilinium) fumarate, 3-methylanilinium hydrogen fumarate and 4-chloroanilinium hydrogen fumarate salts. Acta Crystallogr C 2013; 69:904-9. [PMID: 23907887 DOI: 10.1107/s0108270113017629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Accepted: 06/26/2013] [Indexed: 11/10/2022] Open
Abstract
In bis(2-aminoanilinum) fumarate, 2C₆H₉N₂⁺·C₄H₂O₄²⁻, (I), the asymmetric unit consists of two aminoanilinium cations and one fumarate dianion, whereas in 3-methylanilinium hydrogen fumarate, C₇H₁₀N⁺·C₄H3O₄⁻, (II), and 4-chloroanilinium hydrogen fumarate, C₆H₇ClN⁺·C₄H3O₄⁻, (III), the asymmetric unit contains two symmetry-independent hydrogen fumate anions and anilinium cations with a slight difference in their geometric parameters; the two salts are isostructural. In (II) and (III), the carboxylic acid H atoms of the anions are disordered across both ends of the anion, with equal site occupancies of 0.50. Both the 4-chloroanilinium cations of (III) are disordered over two orientations with major occupancies fixed at 0.60 in each case. The hydrogen fumarate anions of (II) and (III) form one-dimensional anionic chains linked through O-H∙∙∙O hydrogen bonds. Salts (II) and (III) form two-dimensional supramolecular sheets built from R₄⁴16), R₄⁴(18), R₅⁵(25) and C₂²(14) motifs extending parallel to the (010) plane, whereas in (I), an (010) sheet is formed built from two R₄³(13) motifs, two R₂²(9) motifs and an R₄⁴(18) motif.
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99
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Gallos ID, Sivakumar K, Kilby MD, Coomarasamy A, Thangaratinam S, Vatish M. Pre-eclampsia is associated with, and preceded by, hypertriglyceridaemia: a meta-analysis. BJOG 2013; 120:1321-32. [DOI: 10.1111/1471-0528.12375] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/22/2013] [Indexed: 12/27/2022]
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100
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Sivakumar K, Thiruvenkadan A, Ramesh Saravana Kumar V, Muralidharan J, Anandha Prakash Singh D, Saravanan R, Jeyakumar M. Analysis of production and reproduction performances of Soviet Chinchilla and White Giant rabbits in tropical climatic conditions of India. WORLD RABBIT SCIENCE 2013. [DOI: 10.4995/wrs.2013.1208] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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