76
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Sriprasad S, Bushby L, Subramanian K, Sidhu P, Muir G. High frequency colour doppler ultrasound of focal testicular lesion: Crossing vessels (criss-cross) pattern identifies primary malignant tumours. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1569-9056(03)80613-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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77
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78
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Subramanian K, Reddy AVR. Synthesis and characterization of photosensitive copolymers of 4-(4?-nitrocinnamoyl)phenyl acrylate and glycidyl methacrylate. J Appl Polym Sci 2002. [DOI: 10.1002/app.11114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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79
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80
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Seshadri TR, Subramanian K. Cosmic microwave background polarization signals from tangled magnetic fields. PHYSICAL REVIEW LETTERS 2001; 87:101301. [PMID: 11531471 DOI: 10.1103/physrevlett.87.101301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2000] [Revised: 06/29/2001] [Indexed: 05/23/2023]
Abstract
Tangled, primordial cosmic magnetic fields create small rotational velocity perturbations on the last scattering surface of the cosmic microwave background radiation. For fields which redshift to a present value of B0 = 3 x 10(-9) G, these vector modes are shown to generate polarization anisotropies of order 0.1-4 microK on small angular scales (500<l<2000), assuming delta function or a power law spectra with n = -1. About 200 times larger signals result for n = 2 spectra. Unlike inflation generated, scalar modes, these signals are dominated by the odd parity, B-type polarization, which could help in their detection.
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81
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Woodle MC, Scaria P, Ganesh S, Subramanian K, Titmas R, Cheng C, Yang J, Pan Y, Weng K, Gu C, Torkelson S. Sterically stabilized polyplex: ligand-mediated activity. J Control Release 2001; 74:309-11. [PMID: 11489511 DOI: 10.1016/s0168-3659(01)00339-x] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Synthetic vectors have been considered as a safer and more versatile alternative to viral-based gene delivery systems. A variety of very simple synthetic vector systems, e.g., cationic lipid- and polymer-complexed plasmid DNA have activity in vivo but it appears to be mediated by non-specific electrostatic interactions limiting targeting. In order to avoid these problems, we designed a sterically stabilized layered colloidal system. The steric polymer coating reduces non-specific interactions. We have synthesized a PEG conjugate of PEI that complexes DNA to form small, stable colloids with a steric polymer coat on their surface. The polymer enhances colloidal stability and reduces non-specific binding and toxicity. It also renders the complex inactive presumably due to reduced binding. Ligands are then appended to the distal end of the steric polymer to restore cell binding and expression at target cells. We prepared conjugates with RGD peptide ligands appended to the distal end of the steric polymer. The resulting conjugates also form complexes but with ligands exposed on their surface restoring binding and activity. Labeled oligonucleotides and DNA were used to measure intracellular distribution. Oligonucleotides are found localized in the nucleus, whereas the labeled plasmid DNA remained in the cytoplasm. Import of plasmid DNA into the nucleus appears to be very inefficient yet sufficient for expression.
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82
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Subramanian K, Nanjundan S, Rami Reddy A. Synthesis and characterization of copolymers with a photosensitive group. Eur Polym J 2001. [DOI: 10.1016/s0014-3057(00)00182-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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83
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Subramanian K. Photodecomposition of poly(styrene peroxide) in vinyl monomers and structural features of the formed polymers. Eur Polym J 2001. [DOI: 10.1016/s0014-3057(00)00076-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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84
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Subramanian K, Krishnasamy V, Nanjundan S, Rami Reddy A. Photosensitive polymer: synthesis, characterization and properties of a polymer having pendant photocrosslinkable group. Eur Polym J 2000. [DOI: 10.1016/s0014-3057(00)00008-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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85
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Subramanian K, Nanjundan S, Rami Reddy AV. PHOTOPOLYMERS: SYNTHESIS AND CHARACTERIZATION OF POLY(4-CINNA-MOYLPHENYL METHACRYLATE) WITH GLYCIDYL METHACRYLATE. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2000. [DOI: 10.1081/ma-100101150] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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86
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Lemaire J, Subramanian K, Asch DA. Genetic testing for breast and ovarian cancer: implications for life insurance. LDI ISSUE BRIEF 2000; 5:1-4. [PMID: 12523344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
Abstract
As the science of genetic testing progresses, the debate surrounding the uses of genetic information intensifies. In February, President Clinton signed an executive order prohibiting federal agencies from using such information to make hiring, promotion, or placement decisions. Concerns about privacy and discrimination have led many states to propose or enact statutes that prohibit health insurers from using genetic test results in their underwriting decisions. However, few statutes address access to these results by the life insurance industry. This Issue Brief summarizes the current debate on whether life insurers should have access to genetic testing information for breast and ovarian cancer, and provides actuarial insight into the potential effect of such testing on the voluntary term insurance market.
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87
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Subramanian K, Krishnasamy V, Nanjundan S, Rami Reddy A. Photopolymer: synthesis and characterization of poly(4-methacryloyloxyphenyl-4?-chlorostyryl ketone). POLYM INT 2000. [DOI: 10.1002/1097-0126(200006)49:6<579::aid-pi422>3.0.co;2-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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88
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Smart WH, Subramanian K. The use of silicon microfabrication technology in painless blood glucose monitoring. Diabetes Technol Ther 2000; 2:549-59. [PMID: 11469618 DOI: 10.1089/15209150050501961] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A unique minimally invasive system for painless blood testing is now being commercialized for measurement of blood glucose concentration by diabetics. The novel component of this system, a consumable microsampling and assay device, consists of a tough, flexible silicon microneedle comparable in cross-section to a human hair integrated with a silicon microcuvette. This microneedle is capable of reliably taking a very small sample of whole blood completely painlessly, unlike sticks with the much larger metal lancet that must be used in all other current systems. The device permits a one-step process that avoids the need to transfer blood from a skin puncture to a test strip, thus minimizing blood required and possible mess. The small hand-held instrument containing the consumable is touched to the skin of the arm or any other part of the body, not necessarily the tip of the finger, and held there for one second. During this time, the microneedle is advanced and then withdrawn under microprocessor control, puncturing the skin and drawing less than 200 nanoliters of blood into the microcuvette, where the assay is performed automatically. The instrument calculates the blood glucose concentration, displays the result, and holds it in memory for recall. The consumable is produced by silicon microelectromechanical systems technology and can be produced in high volume at low unit cost. This technology shows promise of being extended to other analytes and to continuous monitoring.
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89
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Subramanian K. The nature of social work services in a large public medical center serving an impoverished multicultural population. SOCIAL WORK IN HEALTH CARE 2000; 31:47-63. [PMID: 11081854 DOI: 10.1300/j010v31n02_05] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The purpose of this paper is to describe the nature of social work services in a large public medical center serving an impoverished multicultural population. This monitoring evaluation was developed and conducted within the context of a research collaboration between a School of Social Work and a team of clinical workers, supervisors, and administrators from the social work department of the medical center. The paper includes a description of the development of the assessment instrument as well as the findings, including the categories of sociodemographics, assessments, and services delivered by medical social workers. Conclusions emphasize the degree of anxiety and depression in the patients and their families and the need for clinical social workers to be skilled in the multicultural assessment and treatment of these problems. This need is then put into the context of the current health care climate.
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90
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Balaji R, Subramanian K, Nanjundan S, Rami Reddy AV. Copolymers of 4-(4?-chlorocinnamoyl)phenyl methacrylate and methyl methacrylate: Synthesis, characterization and determination of reactivity ratios. J Appl Polym Sci 2000. [DOI: 10.1002/1097-4628(20001114)78:7<1412::aid-app120>3.0.co;2-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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91
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Subramanian K. Synthesis and characterization of poly(vinyl ferrocene) grafted hydroxyl-terminated poly(butadiene): A propellant binder with a built-in burn-rate catalyst. ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1099-0518(19991115)37:22<4090::aid-pola7>3.0.co;2-r] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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92
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Balaji R, Sivakumar N, Subramanian K, Nanjundan S. SYNTHESIS AND CHARACTERIZATION OF COPOLYMERS OF 2-N-PHTHALIMIDO-2-METHYL PROPYL METHACRYLATE WITH METHYL METHACRYLATE AND DETERMINATION OF COPOLYMER REACTIVITY RATIOS. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 1999. [DOI: 10.1081/ma-100101604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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93
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Subramanian K. Hydroxyl-terminated poly (azidomethyl ethylene oxide-b-butadiene-b-azidomethyl ethylene oxide)—synthesis, characterization and its potential as a propellant binder. Eur Polym J 1999. [DOI: 10.1016/s0014-3057(98)00241-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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94
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Rami Reddy AV, Subramanian K, Sesha Sainath AV. Photosensitive polymers: Synthesis, characterization, and photocrosslinking properties of polymers with pendant ?,?-unsaturated ketone moiety. J Appl Polym Sci 1998. [DOI: 10.1002/(sici)1097-4628(19981212)70:11<2111::aid-app4>3.0.co;2-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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95
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Shen K, Teruel MN, Subramanian K, Meyer T. CaMKIIbeta functions as an F-actin targeting module that localizes CaMKIIalpha/beta heterooligomers to dendritic spines. Neuron 1998; 21:593-606. [PMID: 9768845 DOI: 10.1016/s0896-6273(00)80569-3] [Citation(s) in RCA: 269] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Ca2+/calmodulin-dependent protein kinase II (CaMKII) is a serine/threonine protein kinase that regulates long-term potentiation and other forms of neuronal plasticity. Functional differences between the neuronal CaMKIIalpha and CaMKIIbeta isoforms are not yet known. Here, we use green fluorescent protein-tagged (GFP-tagged) CaMKII isoforms and show that CaMKIIbeta is bound to F-actin in dendritic spines and cell cortex while CaMKIIalpha is largely a cytosolic enzyme. When expressed together, the two isoforms form large heterooligomers, and a small fraction of CaMKIIbeta is sufficient to dock the predominant CaMKIIalpha to the actin cytoskeleton. Thus, CaMKIIbeta functions as a targeting module that localizes a much larger number of CaMKIIalpha isozymes to synaptic and cytoskeletal sites of action.
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96
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Seshadri TR, Subramanian K. Vishniac-type contribution to the polarization of the CMBR? Int J Clin Exp Med 1998. [DOI: 10.1103/physrevd.58.063002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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97
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Kumar S, Subramanian K, Srinivasan R, Rajagopalan K, Schreurs AM, Kroon J, Koellner G, Steiner T. NH···CCH hydrogen bonds as part of cooperative networks: crystal structure of N-(p-methylphenyl)-N-prop-2-ynylurea. J Mol Struct 1998. [DOI: 10.1016/s0022-2860(98)00336-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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98
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McPhillips TH, Dinan D, Subramanian K, Samal SK. Enhancement of aquareovirus infectivity by treatment with proteases: mechanism of action. J Virol 1998; 72:3387-9. [PMID: 9525667 PMCID: PMC109827 DOI: 10.1128/jvi.72.4.3387-3389.1998] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The effects of protease digestion on the polypeptide composition and on the infectivity of striped bass virus, an aquareovirus, were examined. Both trypsin and chymotrypsin enhanced the infectivity of the virus. Enhancement of infectivity was correlated with the digestion of the outer capsid protein, VP7. These studies support the assertion that VP7 is the outermost capsid protein and suggest that VP4 and VP5 are exposed on the outer surface of infectious particles. The possible role of VP7 in the variation in virulence observed among aquareovirus isolates is discussed.
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99
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Thissen JA, Gross JM, Subramanian K, Meyer T, Casey PJ. Prenylation-dependent association of Ki-Ras with microtubules. Evidence for a role in subcellular trafficking. J Biol Chem 1997; 272:30362-70. [PMID: 9374526 DOI: 10.1074/jbc.272.48.30362] [Citation(s) in RCA: 97] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
We recently identified a prenyl peptide-binding protein in microsomal membranes from bovine brain (Thissen, J. A., and Casey, P. J. (1993) J. Biol. Chem. 268, 13780-13783). Through a variety of approaches, this binding protein has been identified as the cytoskeletal protein tubulin. Prenyl peptides bind to purified tubulin with a Kd of 40 nM and also bind to tubulin polymerized into microtubules. Microtubule affinity chromatography of extracts from cells in which the prenyl protein pool was metabolically labeled revealed that prenyl proteins bound to the immobilized microtubules; one, a 24-kDa protein, was tentatively identified as a GTP-binding protein. Of several prenylated GTP-binding proteins tested, including Ki-Ras4B, Ha-Ras, RhoB, RhoA, and Rap1B, only Ki-Ras was found to bind significantly to microtubules, and this was in a prenylation-dependent fashion. A potential significance of the interaction of Ki-Ras4B with microtubules was indicated from analysis of the localization of newly synthesized Ki-Ras4B and Ha-Ras, each tagged with green fluorescence protein (GFP). Treatment of NIH-3T3 cells expressing GFP-Ki-Ras with Taxol (paclitaxel) resulted in accumulation of the expressed protein in intracellular locations, whereas in control cells the protein was correctly targeted to the plasma membrane. Importantly, such treatment with paclitaxel did not affect the cellular localization of expressed GFP-Ha-Ras. These results indicate that an intact microtubule network may be directly involved in Ki-Ras processing and/or targeting and provide direct evidence for a physiological distinction between Ki-Ras and Ha-Ras in cells. Additionally, the finding that paclitaxel treatment of cells disrupts Ki-Ras trafficking suggests an additional mechanism for the anti-proliferative effects of this drug.
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100
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Subramanian K, Samal SK. Cloning and sequence analysis of a non-structural gene of an aquareovirus. Virus Genes 1997; 15:83-86. [PMID: 9354275 DOI: 10.1023/a:1007983619592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The nucleotide and deduced amino acid sequence of genome segment 11 encoding a nonstructural protein of an aquareovirus strain SBR have been determined. Nucleotide sequence analysis showed that the genome segment 11 of SBR virus is 780 nucleotides long and contains a major open reading frame that codes for a polypeptide of 236 amino acids with a predicted molecular weight of 25,504 Da. The second reading frame of genome segment 11 was 480 nucleotides long and codes for a polypeptide of 145 with a predicted molecular weight of 15,715 Da. The genome segment 11 contains 24 nontranslated nucleotides at the 5'-end and 48 nontranslated nucleotides at the 3'-end. This gene codes for two nonstructural polypeptides NS29 and NS15. Comparison of the deduced amino acid sequence of this gene with the published sequences of other members of the family Reoviridae indicated no sequence relatedness.
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