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Rutherford RB, Baker JD, Ernst C, Johnston KW, Porter JM, Ahn S, Jones DN. Recommended standards for reports dealing with lower extremity ischemia: revised version. J Vasc Surg 1997; 26:517-38. [PMID: 9308598 DOI: 10.1016/s0741-5214(97)70045-4] [Citation(s) in RCA: 2446] [Impact Index Per Article: 90.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Recommended standards for analyzing and reporting on lower extremity ischemia were first published by the Journal of Vascular Surgery in 1986 after approval by the Joint Council of The Society for Vascular Surgery and the North American Chapter of the International Society for Cardiovascular Surgery. Many of these standards have been accepted and are used in the current literature on peripheral arterial occlusive disease. With the passage of time, some oversights, aspects that require clarification, and better modifications have been recognized. This report attempts to correct these shortcomings while reinforcing those recommendations that have proven satisfactory. Explanatory comments are added to facilitate understanding and application. This version is intended to replace the original version.
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Dadparvar S, Samimi F, Ahn S, Wang J, Kapadia KM, Gillan MM, Krishna L, Slizofski WJ. CYCLOSPORINE NEPHROTOXICITY AND THE ROLE OF TRIPLE RENAL SCINTIGRAPHY. Clin Nucl Med 1997. [DOI: 10.1097/00003072-199704000-00025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Youngblut JM, Ahn S. How does maternal employment affect preterm infants? MCN Am J Matern Child Nurs 1997; 22:204-8. [PMID: 9234609 PMCID: PMC3560847 DOI: 10.1097/00005721-199707000-00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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354
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baarmand MM, Baden A, Balamurali V, Balderston J, Baldin B, Banerjee S, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Choi S, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D. Isolated Photon Cross Section in the Central and Forward Rapidity Regions in pp-bar Collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1996; 77:5011-5015. [PMID: 10062692 DOI: 10.1103/physrevlett.77.5011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Emanuel JR, Damico C, Ahn S, Bautista D, Costa J. Highly sensitive nonradioactive single-strand conformational polymorphism. Detection of Ki-ras mutations. DIAGNOSTIC MOLECULAR PATHOLOGY : THE AMERICAN JOURNAL OF SURGICAL PATHOLOGY, PART B 1996; 5:260-4. [PMID: 8955617 DOI: 10.1097/00019606-199612000-00006] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Mutation detection by single-strand conformational polymorphism (SSCP) analysis is more difficult when the variant is limited to a small proportion of target sequences in a sample. Use of SYBR-Green II, a sensitive, nonradioactive, minimally hazardous nucleic acid stain, permits detection of Ki-ras mutants present as less than 0.5% of the target sequences. The polymerase chain reaction (PCR) primers we have selected produce an amplicon that distinguishes all clinically observed variants in Ki-ras codons 12 and 13 from the wild type. We compared mutant discrimination and SYBR-Green II detection sensitivity in three formats: (a) standard MDE gel SSCP, (b) rapid minigel MDE using an internal gel temperature controller, and (c) rapid resolution in chilled 15% (37.5:1) acrylamide minigels. All these gels are easily evaluated by standard ultraviolet transillumination and digital image analysis. This ssDNA staining method is rapid, highly reproducible, and minimally hazardous, and minigels use 25% the reagents of most other systems. Our improvements are relevant for the detection of mutations in pathologic samples with minimal targets, such as fine-needle aspirates, and body fluids in which mutated alleles of a gene may be present at low levels but carry a high level of diagnostic or prognostic importance.
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baarmand MM, Baden A, Balamurali V, Balderston J, Baldin B, Banerjee S, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Choi S, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D. Search for Anomalous WW and WZ Production in pp-bar Collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1996; 77:3303-3308. [PMID: 10062187 DOI: 10.1103/physrevlett.77.3303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baarmand MM, Baden A, Balamurali V, Balderston J, Baldin B, Banerjee S, Bantly J, Bartlett JF, Bazizi K, Belyaev A, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Choi S, Chopra S, Choudhary BC, Christenson JH, Chung M. Measurement of the W Boson Mass. PHYSICAL REVIEW LETTERS 1996; 77:3309-3314. [PMID: 10062188 DOI: 10.1103/physrevlett.77.3309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Rousseau MF, Hayashida W, van Eyll C, Hess OM, Benedict CR, Ahn S, Chapelle F, Kobrin I, Pouleur H. Hemodynamic and cardiac effects of the selective T-type and L-type calcium channel blocking agent mibefradil in patients with varying degrees of left ventricular systolic dysfunction. J Am Coll Cardiol 1996; 28:972-9. [PMID: 8837576 DOI: 10.1016/s0735-1097(96)00261-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVES This study sought to assess the hemodynamic and cardiac effects of two dose levels of mibefradil in patients with varying degrees of ischemic left ventricular dysfunction. BACKGROUND Mibefradil is a new, selective T-type and L-type calcium channel blocking agent. Because L-type channel blockade may depress myocardial performance, an invasive hemodynamic study was performed to assess the safety of this agent. METHODS We performed an open label study, examining the effects of two intravenous doses of mibefradil, selected to produce plasma levels comparable to those measured after oral administration of 50 mg (dose 1: 400 ng/ml) or 100 mg (dose 2: 800 ng/ml) of the drug. Variables studied included the indexes of left ventricular function and neurohormone levels. Patients were stratified according to ejection fraction (EF) (> or = 40%, n = 26; < 40%, n = 24) and the presence (n = 15) or absence (n = 35) of heart failure. RESULTS In patients with preserved systolic function, dose 1 had no clinically significant hemodynamic effects, but dose 2 decreased mean aortic pressure and systemic vascular resistance (-8.5 mm Hg, -12%, both p < 0.01) and also reduced end-systolic stress and volume, thus improving EF (52% to 58%, p < 0.01). Heart rate tended to decrease. In patients with depressed EF, heart rate decreased significantly with both doses. The effects of dose 1 mimicked those observed after dose 2 in patients with preserved EF. Dose 2 (plasma levels 1,052 +/- 284 ng/ml) still decreased left ventricular systolic wall stress and improved EF (24.0% to 28.5%, p < 0.05) but also significantly depressed the maximal first derivative of left ventricular pressure. Examination of individual pressure-volume loops in two patients with heart failure showed a clear rightward shift of the loop despite a decrease in systolic pressure, suggesting negative inotropy. Neurohormone levels were unchanged at both dose levels and in all subgroups. CONCLUSIONS Intravenous mibefradil was well tolerated and produced an overall favorable cardiovascular response. However, high plasma concentrations might produce myocardial depression in patients with heart failure, and caution should be exerted in this setting.
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baarmand MM, Baden A, Balamurali V, Balderston J, Baldin B, Banerjee S, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Choi S, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D. Azimuthal Decorrelation of Jets Widely Separated in Rapidity. PHYSICAL REVIEW LETTERS 1996; 77:595-600. [PMID: 10062854 DOI: 10.1103/physrevlett.77.595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ahn S, Yoo M, Lee S, Choi E. A clinical and histopathological study of 22 patients with membranous lipodystrophy. Clin Exp Dermatol 1996; 21:269-72. [PMID: 8959896 DOI: 10.1111/j.1365-2230.1996.tb00091.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Membranous lipodystrophy, an uncommon disorder, was described by Nasu et al. in 1973 as a form of regressive degeneration or localized destruction of the adipose tissue. Clinical features of the lesions with membranous fat necrosis are variable and the condition can only be diagnosed histopathologically. These peculiar changes in fat tissue have been associated with many local and systemic diseases including lupus erythematosus, diabetes mellitus, erythema nodosum, stasis dermatitis, morphoea and trauma, but occasionally no underlying disease is found. Even though various hypotheses concerning the pathogenesis of membranous lipodystrophy have been proposed, the exact causes are still in dispute. We reviewed 22 patients having membranous lipodystrophy confirmed by biopsy and discuss the pathogenetic mechanisms which have been suggested by many authors.
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG. Studies of topological distributions of inclusive three- and four-jet events in p-barp collisions at s=1800 GeV with the D0 detector. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1996; 53:6000-6016. [PMID: 10019891 DOI: 10.1103/physrevd.53.6000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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362
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. Search for right-handed W bosons and heavy W' in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1996; 76:3271-3276. [PMID: 10060925 DOI: 10.1103/physrevlett.76.3271] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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363
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. Search for W-tilde1Z-tilde2 production via trilepton final states in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1996; 76:2228-2233. [PMID: 10060645 DOI: 10.1103/physrevlett.76.2228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. Search for light top squarks in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1996; 76:2222-2227. [PMID: 10060644 DOI: 10.1103/physrevlett.76.2222] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG. Jet production via strongly interacting color-singlet exchange in pp-bar collisions. PHYSICAL REVIEW LETTERS 1996; 76:734-739. [PMID: 10061537 DOI: 10.1103/physrevlett.76.734] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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366
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. Second generation leptoquark search in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1995; 75:3618-3623. [PMID: 10059685 DOI: 10.1103/physrevlett.75.3618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang SM, Chekulaev SV, Chen LP, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE, Cretsinger C, Cullen-Vidal D, Cummings MAC, Cutts D, Dahl OI, De K, Demarteau M, Demina R, Denisenko K, Denisenko N, Denisov D, Denisov SP, Dharmaratna W, Diehl HT, Diesburg M, Di Loreto G, Dixon R, Draper P, Drinkard J, Ducros Y, Dugad SR, Durston-Johnson S, Edmunds D, Ellison J, Elvira VD, Engelmann R, Eno S, Eppley G, Ermolov P, Eroshin OV, Evdokimov VN, Fahey S, Fahland T, Fatyga M, Fatyga MK, Featherly J, Feher S, Fein D, Ferbel T, Finocchiaro G, Fisk HE, Fisyak Y, Flattum E, Forden GE, Fortner M, Frame KC, Franzini P, Fuess S, Galjaev AN, Gallas E, Gao CS, Gao S, Geld TL, Genik RJ, Genser K, Gerber CE, Gibbard B, Glaubman M, Glebov V, Glenn S, Gobbi B, Goforth M, Goldschmidt A, Gómez B, Goncharov PI, Gordon H, Goss LT, Graf N, Grannis PD, Green DR, Green J, Greenlee H, Griffin G, Grossman N, Grudberg P, Grünendahl S, Gu W, Guida JA, Guida JM, Guryn W, Gurzhiev SN, Gutnikov YE, Hadley NJ, Haggerty H, Hagopian S, Hagopian V, Hahn KS, Hall RE, Hansen S, Hatcher R, Hauptman JM, Hedin D, Heinson AP, Heintz U, Hernández-Montoya R, Heuring T, Hirosky R, Hobbs JD, Hoeneisen B, Hoftun JS, Hsieh F, Hu T, Hu T, Huehn T, Igarashi S, Ito AS, James E, Jaques J, Jerger SA, Jiang JZY, Joffe-Minor T, Johari H, Johns K, Johnson M, Johnstad H, Jonckheere A, Jones M, Jöstlein H, Jun SY, Jung CK, Kahn S, Kang JS, Kehoe R, Kelly ML, Kernan A, Kerth L, Kim CL, Kim SK, Klatchko A, Klima B, Klochkov BI, Klopfenstein C, Klyukhin VI, Kochetkov VI, Kohli JM, Koltick D, Kostritskiy AV, Kotcher J, Kourlas J, Kozelov AV, Kozlovski EA, Krishnaswamy MR, Krzywdzinski S, Kunori S, Lami S, Landsberg G, Lanou RE, Lebrat JF, Leflat A, Li H, Li J, Li YK, Li-Demarteau QZ, Lima JGR, Lincoln D, Linn SL, Linnemann J, Lipton R, Liu YC, Lobkowicz F, Loken SC, Lökös S, Lueking L, Lyon AL, Maciel AKA, Madaras RJ, Madden R, Mandrichenko IV, Mangeot P, Mani S, Mansoulié B, Mao HS, Margulies S, Markeloff R, Markosky L, Marshall T, Martin MI, Marx M, May B, Mayorov AA, McCarthy R, McKibben T, McKinley J, Melanson HL, de Mello Neto JRT, Merritt KW, Miettinen H, Milder A, Mincer A, de Miranda JM, Mishra CS, Mohammadi-Baarmand M, Mokhov N, Mondal NK, Montgomery HE, Mooney P, Mudan M, Murphy C, Murphy CT, Nang F, Narain M, Narasimham VS, Narayanan A, Neal HA, Negret JP, Neis E, Nemethy P, Nešić D, Norman D, Oesch L, Oguri V, Oltman E, Oshima N, Owen D, Padley P, Pang M, Para A, Park CH, Park YM, Partridge R, Parua N, Paterno M, Perkins J, Peryshkin A, Peters M, Piekarz H, Pischalnikov Y, Pluquet A, Podstavkov VM, Pope BG, Prosper HB, Protopopescu S, Pušeljić D, Qian J, Quintas PZ, Raja R, Rajagopalan S, Ramirez O, Rao MVS, Rapidis PA, Rasmussen L, Read AL, Reucroft S, Rijssenbeek M, Rockwell T, Roe NA, Rubinov P, Ruchti R, Rusin S, Rutherfoord J, Santoro A, Sawyer L, Schamberger RD, Schellman H, Sculli J, Shabalina E, Shaffer C, Shankar HC, Shivpuri RK, Shupe M, Singh JB, Sirotenko V, Smart W, Smith A, Smith RP, Snihur R, Snow GR, Snyder S, Solomon J, Sood PM, Sosebee M, Souza M, Spadafora AL, Stephens RW, Stevenson ML, Stewart D, Stoianova DA, Stoker D, Streets K, Strovink M, Taketani A, Tamburello P, Tarazi J, Tartaglia M, Taylor TL, Teiger J, Thompson J, Trippe TG, Tuts PM, Varelas N, Varnes EW, Virador PRG, Vititoe D, Volkov AA, Vorobiev AP, Wahl HD, Wang J, Wang LZ, Warchol J, Wayne M, Weerts H, Wenzel WA, White A, White JT, Wightman JA, Wilcox J, Willis S, Wimpenny SJ, Wirjawan JVD, Womersley J, Won E, Wood DR, Xu H, Yamada R, Yamin P, Yanagisawa C, Yang J, Yasuda T, Yoshikawa C, Youssef S, Yu J, Yu Y, Zhang Y, Zhou YH, Zhu Q, Zhu YS, Zhu ZH, Zieminska D, Zieminski A, Zylberstejn A. Top quark search with the D0 1992-1993 data sample. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1995; 52:4877-4919. [PMID: 10019713 DOI: 10.1103/physrevd.52.4877] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Carvalho W, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG. Study of the strong coupling constant using W+jet processes. PHYSICAL REVIEW LETTERS 1995; 75:3226-3231. [PMID: 10059531 DOI: 10.1103/physrevlett.75.3226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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369
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. W and Z Boson Production in pp-bar Collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1995; 75:1456-1461. [PMID: 10060303 DOI: 10.1103/physrevlett.75.1456] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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370
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE. Search for W boson pair production in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1995; 75:1023-1027. [PMID: 10060187 DOI: 10.1103/physrevlett.75.1023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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371
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE. Limits on the anomalous ZZ gamma and Z gamma gamma couplings in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1995; 75:1028-1033. [PMID: 10060188 DOI: 10.1103/physrevlett.75.1028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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372
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Bloom P, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. Measurement of the WW gamma gauge boson couplings in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1995; 75:1034-1039. [PMID: 10060189 DOI: 10.1103/physrevlett.75.1034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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373
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE. Search for squarks and gluinos in pp-bar collisions at sqrt s=1.8TeV. PHYSICAL REVIEW LETTERS 1995; 75:618-623. [PMID: 10060072 DOI: 10.1103/physrevlett.75.618] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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374
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Behnke T, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Callot O, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. Inclusive micro and b-quark production cross sections in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1995; 74:3548-3552. [PMID: 10058233 DOI: 10.1103/physrevlett.74.3548] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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375
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alitti J, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE. Observation of the Top Quark. PHYSICAL REVIEW LETTERS 1995; 74:2632-2637. [PMID: 10057979 DOI: 10.1103/physrevlett.74.2632] [Citation(s) in RCA: 155] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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376
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Álvarez G, Alves GA, Amidi E, Amos N, Anderson EW, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Behnke T, Bendich J, Beri SB, Bertram I, Bezzubov VA, Bhat PC, Bhatnagar V, Bhattacharjee M, Bischoff A, Biswas N, Blazey G, Blessing S, Boehnlein A, Bojko NI, Borcherding F, Borders J, Boswell C, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi VS, Butler JM, Callot O, Casey D, Castilla-Valdez H, Chakraborty D, Chang S, Chekulaev SV, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J. Search for high mass top quark production in pp-bar collisions at sqrt s=1.8 TeV. PHYSICAL REVIEW LETTERS 1995; 74:2422-2426. [PMID: 10057924 DOI: 10.1103/physrevlett.74.2422] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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377
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Rousseau MF, Melin J, Benedict CR, Ahn S, Raphaël D, Bornemann M, Pouleur H. Effects of nisoldipine therapy on myocardial perfusion and neuro-hormonal status in patients with severe ischaemic left ventricular dysfunction. Eur Heart J 1994; 15:957-64. [PMID: 7925518 DOI: 10.1093/oxfordjournals.eurheartj.a060616] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The effects of nisoldipine on regional myocardial perfusion and neuro-hormonal status were assessed in a double-blind, placebo-controlled study of 32 patients. All patients had ischaemic left ventricular dysfunction, with a left ventricular ejection fraction between 25% and 35%; per protocol, they were stratified according to concomitant use of ACE inhibitors. After baseline measurements at rest, including single photon emission computed tomography (SPECT) with Tc-MIBI, plasma neuro-hormones (norepinephrine, renin, arginine vasopressin, atrial natriuretic peptide) and echocardiography, the patients were randomized to nisoldipine (core coat tablet, 20 mg once daily; n = 16) or placebo (n = 16). Measurements were repeated after 8 weeks. SPECT data were analysed qualitatively (visual comparison by blinded observer) and quantitatively to derive an index of hypoperfusion representing the percentage of the left ventricular mass with Tc-MIBI activity below normal. At baseline, all patients had left ventricular areas with reduced Tc-MIBI uptake and 29 patients also had increases in plasma neuro-hormones. With nisoldipine, the extent of hypoperfusion (quantitative analysis) was reduced in 8/14 patients vs only 2/14 patients with placebo (P = 0.046, 2-tailed test). The benefit of nisoldipine was similar in patients with or without ACE inhibitor therapy and was also confirmed by the visual analysis of the data. Further, none of the neuro-hormones examined was significantly modified by nisoldipine. Thus, chronically underperfused areas are present at rest in patients with ischaemic left ventricular dysfunction, and nisoldipine significantly improved Tc-MIBI uptake in these areas without evidence of detrimental changes in plasma neuro-hormones.(ABSTRACT TRUNCATED AT 250 WORDS)
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Porter E, Ahn S, Cunningham P, Lazerson J. Anemia in a premature infant of a Jehovah's Witness. HOSPITAL PRACTICE (OFFICE ED.) 1994; 29:99-100. [PMID: 8175941 DOI: 10.1080/21548331.1994.11443022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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379
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alvarez G, Alves GA, Amos N, Anderson EW, Antipov Y, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Behnke T, Bendich J, Beri SB, Bezzubov V, Bhat PC, Bhatnagar V, Biswas N, Blazey G, Blessing S, Boehnlein A, Borcherding F, Borders J, Bozko N, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi V, Butler JM, Callot OH, Castilla-Valdez H, Chakraborty D, Chekulaev S, Chen J, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE, Cretsinger C, Cullen-Vidal D, Cummings M, Cussonneau JP. Rapidity gaps between jets in pp-bar collisions at sqrt s =1.8 TeV. PHYSICAL REVIEW LETTERS 1994; 72:2332-2336. [PMID: 10055853 DOI: 10.1103/physrevlett.72.2332] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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380
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Abachi S, Abbott B, Abolins M, Acharya BS, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alvarez G, Alves GA, Amos N, Anderson EW, Antipov Y, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Behnke T, Bendich J, Beri SB, Bezzubov V, Bhat PC, Bhatnagar V, Biswas N, Blazey G, Blessing S, Boehnlein A, Borcherding F, Borders J, Bozko N, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi V, Butler JM, Callot OH, Castilla-Valdez H, Chakraborty D, Chekulaev S, Chen J, Chen L, Chen W, Chevalier L, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE, Cretsinger C, Cullen-Vidal D, Cummings M, Cussonneau JP. Search for the top quark in pp-bar collisions at sqrt s =1.8 TeV. PHYSICAL REVIEW LETTERS 1994; 72:2138-2142. [PMID: 10055799 DOI: 10.1103/physrevlett.72.2138] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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381
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Rousseau MF, Konstam MA, Benedict CR, Donckier J, Galanti L, Melin J, Kinan D, Ahn S, Ketelslegers JM, Pouleur H. Progression of left ventricular dysfunction secondary to coronary artery disease, sustained neurohormonal activation and effects of ibopamine therapy during long-term therapy with angiotensin-converting enzyme inhibitor. Am J Cardiol 1994; 73:488-93. [PMID: 7908164 DOI: 10.1016/0002-9149(94)90680-7] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Left ventricular function and neurohormonal status in patients with heart failure remaining symptomatic during therapy with angiotensin-converting enzyme inhibitors were assessed, and the effects of dopaminergic receptor stimulation in this setting were determined. Neurohormonal and left ventricular function (radionuclide angiography) data were obtained in 19 patients with symptomatic ischemic heart failure. Measurements were repeated after 4 to 6 weeks of therapy with the dopamine agonist ibopamine (100 mg, 3 times/day) or placebo administered in a double-blind, randomized, parallel group design. At baseline, despite therapy with enalapril, the angiotensin II levels (mean 39.4 pg/ml; p < 0.01 vs controls) were significantly increased, as were plasma norepinephrine (497 +/- 240 pg/ml; p < 0.01 vs controls), endothelin-1, atrial natriuretic peptide and arginine vasopressin. Moreover, in comparison with pretreatment values, left ventricular ejection fraction had decreased substantially (-9.1%) in patients with plasma norepinephrine > or = 600 pg/ml, but not in those with lower values of norepinephrine. With ibopamine, plasma norepinephrine decreased from 516 +/- 241 to 391 +/- 208 pg/ml (n = 8; p < 0.025 vs placebo), whereas it increased with placebo. In conclusion, the neurohormonal control provided by an angiotensin-converting enzyme inhibitor is reduced in a large subset of patients during prolonged therapy; ibopamine appears to be a potentially useful drug to improve neurohormonal control in this setting.
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Abachi S, Abbott B, Abolins M, Acharya S, Adam I, Adams DL, Adams M, Ahn S, Aihara H, Alvarez G, Alves GA, Amos N, Anderson EW, Antipov Y, Aronson SH, Astur R, Avery RE, Baden A, Balamurali V, Balderston J, Baldin B, Bantly J, Bartlett JF, Bazizi K, Behnke T, Bendich J, Beri SB, Bezzubov V, Bhat PC, Bhatnagar V, Biswas N, Blazey G, Blessing S, Boehnlein A, Borcherding F, Borders J, Bozko N, Brandt A, Brock R, Bross A, Buchholz D, Burtovoi V, Butler JM, Callot OH, Castilla-Valdez H, Chakraborty D, Chekulaev S, Chen J, Chen L, Chen W, Chopra S, Choudhary BC, Christenson JH, Chung M, Claes D, Clark AR, Cobau WG, Cochran J, Cooper WE, Cretsinger C, Cullen-Vidal D, Cummings M, Cutts D, Dahl OI. First generation leptoquark search in pp-bar collisions at sqrt s =1.8 TeV. PHYSICAL REVIEW LETTERS 1994; 72:965-969. [PMID: 10056583 DOI: 10.1103/physrevlett.72.965] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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383
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Rogers WJ, Johnstone DE, Yusuf S, Weiner DH, Gallagher P, Bittner VA, Ahn S, Schron E, Shumaker SA, Sheffield LT. Quality of life among 5,025 patients with left ventricular dysfunction randomized between placebo and enalapril: the Studies of Left Ventricular Dysfunction. The SOLVD Investigators. J Am Coll Cardiol 1994; 23:393-400. [PMID: 8294693 DOI: 10.1016/0735-1097(94)90426-x] [Citation(s) in RCA: 114] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
OBJECTIVES This study was performed to assess the quality of life of patients with left ventricular dysfunction for up to 2 years after randomization to enalapril or placebo. BACKGROUND Previous reports have documented that survival of patients with congestive heart failure can be extended by the angiotensin-converting enzyme inhibitor enalapril. However, it is unknown whether enalapril has a long-term favorable impact on the quality of life in patients with heart failure. METHODS A brief quality of life questionnaire assessing the quality of life was administered at baseline and at 6 weeks, 1 year and 2 years of follow-up to patients randomized to placebo or enalapril in the Studies of Left Ventricular Dysfunction (SOLVD). Participants had an ejection fraction < or = 0.35, no other serious illnesses and either symptomatic heart failure (treatment trial, n = 2,465) or asymptomatic left ventricular dysfunction (prevention trial, n = 2,560). RESULTS Among the 14 scales of quality of life, better scores at one or more follow-up intervals were noted in 6 scales in the treatment trial and in 1 scale in the prevention trial among patients assigned to enalapril. Consistent superiority with enalapril at two consecutive follow-up intervals was noted in the treatment trial for social functioning and dyspnea but for no scale in the prevention trial. However, an average of 40% of quality of life responses were missing at 2 years of follow-up because of death or failure to complete the questionnaire. In the treatment trial, survivors with more severe heart failure were less likely to complete the questionnaire. CONCLUSIONS Modest benefits in quality of life for > or = 1 year occurred when patients with left ventricular dysfunction and symptomatic heart failure were treated with enalapril. No apparent beneficial or adverse effect on quality of life was observed with enalapril in asymptomatic patients with left ventricular dysfunction.
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Ahn CW, Mezzich JE, Ahn S, Fabrega H. Nonparametric mixture logistic regression models for clinical disposition. J Psychiatr Res 1994; 28:23-33. [PMID: 8064639 DOI: 10.1016/0022-3956(94)90034-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Psychiatric hospitalization is one of the most important decisions in the care of patients. This is attributed to the complexity and intensity of treatment and isolation of patients from the family and community into a typically highly controlled and supervised setting. Logistic regression models are fitted to assess the relationship between DSM-III axes and psychiatric hospitalization decisions. Since the apparent error rate tends to underestimate the true error rate, the estimate for the downward bias of the apparent error was computed. A generalization of the logistic regression model is fitted where the intercept is assumed to be a random parameter.
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Ahn S, Anderson JA, Sorrells ME, Tanksley SD. Homoeologous relationships of rice, wheat and maize chromosomes. MOLECULAR & GENERAL GENETICS : MGG 1993; 241:483-90. [PMID: 7903411 DOI: 10.1007/bf00279889] [Citation(s) in RCA: 271] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A set of cDNA clones, which had previously been mapped onto wheat chromosomes, was genetically mapped onto the chromosomes of rice. The resulting comparative maps make it possible to estimate the degree of linkage conservation between these two species. A number of chromosomal rearrangements, some of which must have involved interchromosomal translocations, differentiate the rice and wheat genomes. However, synteny of a large proportion of the loci appears to be conserved between the two species. The results of this study, combined with those from a recently published comparative map of the rice and maize genomes, suggest that rice, wheat and maize share extensive homoeologies in a number of regions in their genomes. Some chromosomes (e.g. chromosome 4 in rice, chromosomes 2 and 2S in wheat and maize, respectively) may have escaped major rearrangement since the divergence of these species from their last common ancestor. Comparative maps for rice, wheat and maize should make it possible to begin uniting the genetics of these species and allow for transfer of mapping information (including centromere positions) and molecular marker resources (e.g. RFLP probes) between species. In addition, such maps should shed light on the nature of chromosome evolution that accompanied the radiation of grasses in the early stages of plant diversification.
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Eton D, Ahn S, Kitada S, Shim V, Elis DG, Lee D. Pitfalls in evaluation of photosensitizing agents: an example with Q-switch II dye. Laryngoscope 1993; 103:1284-90. [PMID: 8231583 DOI: 10.1288/00005537-199311000-00012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Photosensitizing agents potentiating laser therapy should have limited toxicity, no mutagenicity, stable spectral characteristics, and acceptable solubility when administered in vivo. Q-Switch II dye (QII) has been shown by others to be an effective chromophore for photodynamic therapy at 1051 nm in fibroblast cell culture. The objective of this study was to determine the spectral stability of QII in biological media and then to localize QII after administration in vivo. Spectral evaluation was performed between 250 and 1100 nm. QII dissolved in dimethyl sulfoxide (DMSO) rapidly lost its spectral characteristics, including its 1051-nm peak, when contacting water, minimal essential medium, human serum, organ surfaces, and intracellular fluid. One minute following intramuscular (IM) injection of 0.1 mg QII in 0.2 mL of DMSO, the dose precipitated as a discrete mass which was excised and reconstituted in DMSO. A new spectral pattern was seen, with no absorption between 850 and 1100 nm. Following intravenous (i.v.), (IM), or intraperitoneal (IP) injection, QII was not detected in any organ. Q-Switch II dye is not a suitable chromophore for in vivo photodynamic therapy at 1051 nm. Previous cell culture reports to the contrary did not account for the QII spectral change caused by biological media. Simple rapid assays are described to avoid this pitfall.
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Konstam MA, Kronenberg MW, Rousseau MF, Udelson JE, Melin J, Stewart D, Dolan N, Edens TR, Ahn S, Kinan D. Effects of the angiotensin converting enzyme inhibitor enalapril on the long-term progression of left ventricular dilatation in patients with asymptomatic systolic dysfunction. SOLVD (Studies of Left Ventricular Dysfunction) Investigators. Circulation 1993; 88:2277-83. [PMID: 8222122 DOI: 10.1161/01.cir.88.5.2277] [Citation(s) in RCA: 207] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
BACKGROUND Patients with heart failure and reduced left ventricular (LV) ejection fraction (EF) manifest progressive LV dilatation, which is prevented by angiotensin converting enzyme (ACE) inhibitors. In patients with asymptomatic LV systolic dysfunction, in whom there is less activation of the renin-angiotensin system, ventricular remodeling might be less rapid and the benefit of ACE inhibitors less discernible. METHODS AND RESULTS One hundred eight patients enrolled in the Studies of Left Ventricular Dysfunction (SOLVD) Prevention Trial, with left ventricular ejection fraction < or = 0.35 but without clinical heart failure, underwent radionuclide ventriculograms, and 49 underwent left heart catheterizations. Measurements were made before and after double-blinded randomization to enalapril (2.5 to 20 mg/d) or placebo. Repeated-measures analysis of all time points showed significant differences for change in end-diastolic volume (EDV) between enalapril and placebo groups. Significant difference between the enalapril and placebo groups (P < .05) was present for change in EDV at 1 year within the catheterization study and at a mean of 25 months within the radionuclide study. Radionuclide EDV increased in placebo patients (119 +/- 28 to 124 +/- 33 mL/m2, mean +/- SD) and decreased in enalapril patients (120 +/- 25 to 113 +/- 25 mL/m2). Differences between the two groups were significantly less than previously described in patients with symptomatic heart failure (P < .02), with less increase in LV volumes in the placebo group and less decrease in volumes in the enalapril group. CONCLUSIONS Chronic ACE inhibitor treatment slows or reverses LV dilatation in patients with asymptomatic LV systolic dysfunction. Compared with symptomatic patients, asymptomatic patients manifest a slower rate of spontaneous LV dilatation and less reduction in LV volumes by enalapril.
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Abstract
Genetic linkage maps have been constructed for the rice and maize genomes on the basis of orthologous loci detected with a common set of cDNA clones. Conserved linkage groups could be identified, which together account for more than two-thirds of both genomes. In some instances, entire chromosomes or chromosome arms are nearly identical with respect to gene order and gene content. The results also reveal that most of the genes (> 72%) duplicated during ancient polyploidization are still present in the maize genome in duplicate copy. The comparative maps of rice and maize provide a basis for interpreting molecular, genetic, and breeding information between these two important species and establish a framework for ultimately connecting the genetics of all grass species.
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389
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Pouleur H, Rousseau MF, van Eyll C, Stoleru L, Hayashida W, Udelson JA, Dolan N, Kinan D, Gallagher P, Ahn S. Effects of long-term enalapril therapy on left ventricular diastolic properties in patients with depressed ejection fraction. SOLVD Investigators. Circulation 1993; 88:481-91. [PMID: 8101772 DOI: 10.1161/01.cir.88.2.481] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND The aim of the present study was to analyze the changes in left ventricular diastolic function that occur in patients with chronic severe left ventricular systolic dysfunction in the absence or presence of prolonged therapy with an angiotensin converting enzyme inhibitor. METHODS AND RESULTS Left ventricular function data (cineangiography plus Millar, frame-by-frame analysis) and right ventricular volumes (radionuclide angiography) were obtained at baseline and after an average follow-up of 12.4 months in 42 patients with a left ventricular ejection fraction of 35% or less. After baseline measurements, the patients were randomized to placebo (n = 16) or enalapril (10 mg BID, n = 26). In the placebo group, the changes in left ventricular function were characterized by increases in end-diastolic (159 +/- 43 to 170 +/- 44 mL/m2) and end-systolic (119 +/- 38 to 128 +/- 49 mL/m2) volumes accompanied by a downward and rightward shift of the diastolic pressure-volume relation. In contrast, decreases in end-diastolic (166 +/- 43 to 156 +/- 47 mL/m2) and end-systolic (125 +/- 43 to 111 +/- 42 mL/m2) volumes accompanied by a slight upward and leftward shift of the diastolic pressure-volume relation were noted in the enalapril group. These changes in left ventricular volumes were significantly different between groups (both P < .005) but were not attended by changes in left ventricular end-diastolic pressure, in time constant of isovolumic pressure decrease, or in right ventricular volumes. However, the chamber stiffness constant beta decreased from 0.044 +/- 0.027 to 0.032 +/- 0.019 mL-1/m2 in the placebo group, whereas it increased insignificantly in the enalapril group (0.040 +/- 0.028 to 0.041 +/- 0.028 mL-1/m2). These changes in chamber stiffness constant beta between baseline and follow-up were significantly different between placebo and enalapril groups (P < .05). Another index of chamber compliance, delta V/delta P, also confirmed the presence of opposite changes in left ventricular chamber compliance in the placebo group and in the enalapril group. The mean diastolic wall stress increased with placebo but not with enalapril (+51 versus -13 kdyn/cm2; P < .04) whereas left ventricular mass and the indexes of left ventricular sphericity tended to improve in the enalapril group. The changes in plasma levels of norepinephrine, atrial natriuretic peptide, and arginine vasopressin were, however, comparable in both groups. CONCLUSIONS The data indicate that in patients with severe systolic left ventricular dysfunction, the progressive left ventricular dilatation was accompanied by a decrease in left ventricular chamber stiffness; enalapril therapy was able to prevent or partially reverse these changes and tended to reduce left ventricular mass and ventricular sphericity. Those changes were suggestive of partial reversal of left ventricular remodeling by enalapril administration.
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390
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Tice HM, Jones KM, Mulkern RV, Schwartz RB, Kalina P, Ahn S, Barnes P, Jolesz F. Fast spin-echo imaging of intracranial neoplasms. J Comput Assist Tomogr 1993; 17:425-31. [PMID: 8491905 DOI: 10.1097/00004728-199305000-00017] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Our goal was to compare dual echo fast SE (FSE) T2-weighted MRI of intracranial neoplasms with conventional SE (CSE) images. In phase 1 of the study, CSE and FSE dual echo MR studies of 33 patients with intracranial neoplasms and 26 normal controls were separately interpreted by three neuroradiologists blinded to clinical history to ascertain differences in lesion conspicuity. The CSE and FSE images were read independently, in random order, with at least a 3 week interval between readings. In phase 2 of the study, CSE and FSE sequences were compared side by side by three neuroradiologists independently to evaluate lesion conspicuity and artifacts and to determine whether FSE would be an acceptable replacement for CSE imaging. Lesion detection was equivalent in 111 of 117 interpretations (94.9%). The CSE and FSE sequences were equivalent in detecting lesion-associated abnormalities (hemorrhage, calcium, mass effect, edema, and hydrocephalus) and in characterizing lesion size, margins, and signal intensity. Nonspecific T2 white matter hyperintensities were detected more often with CSE, while susceptibility artifacts were less conspicuous on FSE. Ventricular catheters, postoperative soft tissue and bony changes, and postradiation therapy changes were detected equally well on both sequences. In phase 2 of the study, lesion conspicuity and presence of artifacts were felt to be equivalent with the two sequences. The FSE sequences can serve as a rapid, feasible alternative to conventional CSE sequences for intracranial tumor detection.
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391
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Konstam MA, Rousseau MF, Kronenberg MW, Udelson JE, Melin J, Stewart D, Dolan N, Edens TR, Ahn S, Kinan D. Effects of the angiotensin converting enzyme inhibitor enalapril on the long-term progression of left ventricular dysfunction in patients with heart failure. SOLVD Investigators. Circulation 1992; 86:431-8. [PMID: 1638712 DOI: 10.1161/01.cir.86.2.431] [Citation(s) in RCA: 344] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND In patients with heart failure, activation of the renin-angiotensin system is common and has been postulated to provide a stimulus for further left ventricular (LV) structural and functional derangement. We tested the hypothesis that chronic administration of the angiotensin converting enzyme (ACE) inhibitor enalapril prevents or reverses LV dilatation and systolic dysfunction among patients with depressed ejection fraction (EF) and symptomatic heart failure. METHODS AND RESULTS We examined subsets of patients enrolled in the Treatment Trial of Studies of Left Ventricular Dysfunction (SOLVD). Fifty-six patients with mild to moderate heart failure underwent serial radionuclide ventriculograms, and 16 underwent serial left heart catheterizations, before and after randomization to enalapril (2.5-20 mg/day) or placebo. At 1 year, there were significant treatment differences in LV end-diastolic volume (EDV; p less than 0.01), end-systolic volume (ESV; p less than 0.005), and EF (p less than 0.05). These effects resulted from increases in EDV (mean +/- SD, 136 +/- 27 to 151 +/- 38 ml/m2) and ESV (103 +/- 24 to 116 +/- 24 ml/m2) in the placebo group and decreases in EDV (140 +/- 44 to 127 +/- 37 ml/m2) and ESV (106 +/- 42 to 93 +/- 37 ml/m2) in the enalapril group. Mean LVEF increased in enalapril patients from 0.25 +/- 0.07 to 0.29 +/- 0.08 (p less than 0.01). There was a significant treatment difference in LV end-diastolic pressure at 1 year (p less than 0.05), with changes paralleling those of EDV. The time constant of LV relaxation changed only in the placebo group (p less than 0.01 versus enalapril), increasing from 59.2 +/- 8.0 to 67.8 +/- 7.2 msec. Serial radionuclide studies over a period of 33 months showed increases in LV volumes only in the placebo group. Two weeks after withdrawal of enalapril, EDV and ESV increased to baseline levels but not to the higher levels observed with placebo. CONCLUSIONS In patients with heart failure and reduced LVEF, chronic ACE inhibition with enalapril prevents progressive LV dilatation and systolic dysfunction (increased ESV). These effects probably result from a combination of altered remodeling and sustained reduction in preload and afterload.
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392
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Ahn S, Rutherford RB. A multicenter prospective randomized trial to determine the optimal treatment of patients with claudication and isolated superficial femoral artery occlusive disease: conservative versus endovascular versus surgical therapy. J Vasc Surg 1992; 15:889-91. [PMID: 1533686 DOI: 10.1016/0741-5214(92)90736-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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393
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Ganguly AK, Ahn S. Nonlinear theory of the slow-wave cyclotron amplifier. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1990; 42:3544-3554. [PMID: 9904438 DOI: 10.1103/physreva.42.3544] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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394
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Ganguly AK, Freund HP, Ahn S. Nonlinear theory of the orbitron maser in three dimensions. PHYSICAL REVIEW. A, GENERAL PHYSICS 1987; 36:2199-2209. [PMID: 9899111 DOI: 10.1103/physreva.36.2199] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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395
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Carrasquer G, Ahn S, Schwartz M, Rehm WS. Electrogenicity of the Na-K-ATPase pump in bullfrog cornea epithelium. THE AMERICAN JOURNAL OF PHYSIOLOGY 1985; 249:F185-91. [PMID: 2992289 DOI: 10.1152/ajprenal.1985.249.2.f185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The effect of changing the K concentration in the aqueous solution was studied in the frog cornea. In general, when the K concentration was increased from 4 to 20 or 79 mM, the transepithelial PD and resistance decreased. If K was decreased from 79 to 4, 20 to 4, or 4 to 0 mM, or any other combination, the PD and resistance increased. These are normal PD responses. If after a K-free period of more than 5-10 min the K was increased to 4 mM, the PD increased, an anomalous PD response. If K was increased from 0 to 20 mM, there was an initial PD increase (anomalous response) followed by a PD decrease (normal response). If K was increased from 0 to 79 mM the PD decreased, normal response only. The resistance decreased with every increase in K concentration. Anomalous responses were abolished in Na-free solutions and in the presence of both 10(-3) M ouabain and 10(-4) M vanadate in the aqueous solution. We interpret the results on the basis of two pathways, a simple K-conductive pathway and an electrogenic Na-K-ATPase pump pathway with more Na's than K's per cycle. The normal or anomalous PD responses to changes in aqueous K concentration depend on the relative resistance of the two pathways.
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Klimek J, Ajemian E, Hryb K, Jimenez L, Drezner D, Ahn S. Patterns of antibiotic usage in a surgical intensive care unit. J Hosp Infect 1984. [DOI: 10.1016/0195-6701(84)90062-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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397
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Ahn CH, Lowell JR, Ahn SS, Ahn S, Hurst GA. Chemotherapy for pulmonary disease due to Mycobacterium kansasii: efficacies of some individual drugs. REVIEWS OF INFECTIOUS DISEASES 1981; 3:1028-34. [PMID: 7339800 DOI: 10.1093/clinids/3.5.1028] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
An evaluation of chemotherapy was made for 256 patients with pulmonary infection due to Mycobacterium kansasii. Studies of in vitro resistance of M. kansasii and Mycobacterium tuberculosis to various drugs revealed important differences between the two species that should be considered when planning chemotherapy. Partial or no in vitro resistance to 1 microgram of isoniazid/ml did not adversely affect the time required for conversion of sputum from positive to negative, whereas complete resistance to isoniazid had a statistically significant (P less than 0.001) adverse effect. All of the 115 patients who received treatment that included rifampin (initial and retreatment) had sputum conversion within four months. However, for regimens that did not include rifampin, 127 (90%) of 141 patients had conversion within four months (P less than 0.01). After completion of chemotherapy that included rifampin, there were no relapses among 64 patients, but after therapy without rifampin, four (7%) of 59 patients relapsed. The greater efficacy of the regimens that included rifampin may be due at least partially to the fact that more drugs were administered than in regimens that did not include rifampin. The use of p-aminosalicylic acid seems unwarranted in the treatment of disease due to M. kansasii. Since rifampin may be the most potent drug for treatment of this disease, the recommended combinations for initial treatment are (l) rifampin, streptomycin, isoniazid, and ethambutol, or (2) rifampin and two other drugs to which the organism is sensitive.
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398
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399
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Davidson L, Burkom M, Ahn S, Chang LC, Kitto B. L-Asparagainases from Citrobacter freundii. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 480:282-94. [PMID: 401650 DOI: 10.1016/0005-2744(77)90341-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Three enzymes which catalyze the hydrolysis of L-asparagine have been identified in extracts of Citrobacter freundii. One of these (asparaginase-glutaminase (EC 3.5.1.1) also shows substantial glutaminase activity. This enzyme is extremely labile, is sensitive to inactivation by p-chloromercuribenzoate, and is not protected by dithiothreitol. A second enzyme (asparaginase B) is also sensitive to mercurials but is protected from inactivation by dithiothreitol. This enzyme has a relatively low affinity for L-asparagine (Km = 1.7-10(-3) M). The third enzyme (asparaginase A) is insensitive to inactivation by mercurials, is stable upon long term storage and has a relatively high affinity for L-asparagine (Km = 2.9-10(-5) M). This enzyme has been purified to homogeneity and has a molecular weight of approx. 140 000; the subunit weight being approx. 33 000. The C. freundii asparaginase A produced significant increases in the survival time of C3H/HE mice carrying the 6C3HED lymphoma tumor.
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