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  • 1
    Electronic Resource
    Electronic Resource
    Improved preparation of the clathrate host compound tri-o-thymotide and related trisalicylide derivatives (1991)
    s.l. : American Chemical Society
    The @journal of organic chemistry 56 (1991), S. 4525-4529 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00014a037
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  • 2
    Electronic Resource
    Electronic Resource
    Nonadiabatic electronic spin transition in ligand–heme protein binding kinetics and the influence of the heme Fe molecular environment (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 387-398 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nonadiabatic spin transitions can significantly reduce rates in reactions involving transition metals. Zero field spin splittings can further modulate the reaction rate at temperatures with thermal energies of the same size as the zero field splittings, and the low temperature reaction rate can be completely shut off in ligand fields of relatively low symmetry, C2v or D2, for example, due to a vanishing of the electronic matrix element between the initial and final ground spin states. We show in this paper that if the site symmetry is lowered even further, the electronic matrix element coupling the ground spin states can become nonzero, allowing the reaction to occur as the temperature approaches zero. We show what factors in the metal's ligand environment are important for the electronic coupling between the initial and final electronic states. This is especially relevant for transition metals in sites of low symmetry, such as are found in biomolecules. We focus specifically on heme proteins and show how factors in the immediate environment of the Fe, such as the proximal histidine, may lower the site symmetry sufficiently to allow a nonzero low temperature nonadiabatic electronic spin transition that may be necessary for ligand binding. We also use these ideas to make predictions that could resolve the question of whether the reversible binding of CO to heme proteins is a nonadiabatic electronic process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462475
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  • 3
    Electronic Resource
    Electronic Resource
    Treatment of Acute Cardiac Rupture by Autologous Pericardial Patch Without Infarctectomy (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 9 (1994), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1994.tb00862.x
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  • 4
    Electronic Resource
    Electronic Resource
    Endarterectomy of the Left Anterior Descending Coronary Artery (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 9 (1994), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Increasing numbers of patients with extensive coronary artery disease present for surgical revascularization. Diffuse atherosclerosis of the anterior descending artery remains a significant challenge and endarterectomy may be required to increase graft outflow. A surgeon may choose local endarterectomy or be accidentally forced into endarterectomy when attempting to split a lesion distal to a critical stenosis. Distal traction endarterectomy may be performed through a medium sized arteriotomy and closed with a vein patch, to which an internal mammary artery (IMA) or saphenous vein graft is constructed. More diffuse disease, or the breaking of an endarterectomy specimen, may require a direct vision total endarterectomy of the entire length of the left anterior descending coronary artery (LAD), which is then closed by a long vein patch. The IMA is not usually grafted to such an extensive reconstruction. There has not been an increase in perioperative risk from LAD endarterectomy when compared to patients undergoing coronary artery bypass grafting without endarterectomy. (J Card Surg 1994;9:89–96)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1994.tb00831.x
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  • 5
    Electronic Resource
    Electronic Resource
    Initial Clinical Experience with the Toronto Stentless Porcine ValveTM (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 9 (1994), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report our initial experience from April 1992 to November 1993 with a stentless porcine valve (Toronto SPVTM Valve, St. Jude Medical) for aortic valve replacement (AVR) in 21 consecutive patients and compare this group to a matched cohort that underwent AVR with a Hancock II (Medtronic) bloprosthesis. There were no hospital deaths in either group. Postoperative hospitalization was 5.5 ± 0.8 versus 7.0 ± 2.3 days (p = 0.004). Aortic cross-clamp time was 114.5 ± 15.7 min In the SPV group and 96.0 ± 25.0 min in the Hancock II group (p = 0.003). Complications in the SPV group were: one patient suffered perioperative infarction, one patient required late reoperation for left main stenosis, and one patient died suddenly following femoral thrombectomy at another center. Complications in the Hancock II group included: one patient with postoperative low output syndrome, and two late deaths (one from an aortic dissection and the other from chronic liver disease secondary to alcohol abuse). Comparison data indicate that the average size valve implanted in the SPV group was higher than in the Hancock II group (26.3 ± 1.9 vs 24.0 ± 1.9, p = 0.001). In the SPV group, 16 patients had 0 or trivial regurgitation and 1+ regurgitation was seen in 5 patients; regurgitation did not change over a 12-month follow-up. We observed a decrease in gradients over time (p 〈 0.01). Our results are compatible with a hypothesis that the ventricle undergoes remodeling over time, once the obstruction is relieved. We think the stentiess design is an important feature that allows this to occur. Furthermore, this design allows for the implantation of a larger size valve for the same body size, as well as for decreased shear forces during diastole, with accompanying better hemodynamics, and potential improvement in longevity. These results indicate that the SPV valve has excellent hemodynamic characteristics that do not appear to change over a short follow-up period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1994.tb00865.x
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  • 6
    Electronic Resource
    Electronic Resource
    Recent Preoperative Myocardial Infarction Increases the Risk of Surgery for Unstable Angina (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 6 (1991), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Patients with postinfarction angina undergoing surgery for unstable angina face an increased risk of operative mortality. Between January 1982 and December 1987, clinical, angiographic, and operative data was collected prospectively in 588 unstable patients with a prior myocardial infarction within 30 days of surgery (MI) and 5951 unstable patients without preoperative damage (NONMI). MI patients were characterized as being older (age ± 70 years: MI, 19.7%; NONMI, 11.6%; p 〉 0.001) and having more left ventricular dysfunction (left ventricular ejection fraction 〉 40%: MI, 34.8%; NONMI, 26.4%; p 〉 0.001). Semi-elective surgery was performed in 82.0% of NONMI patients while 76.9% of MI patients underwent urgent surgery. Operative mortality was increased in MI patients (MI, 11.1%; NONMI, 4.0%; p 〉 0.001) which was related to the extent of preoperative MI (non-Q wave, 8.3%; Q wave, 17.5%; p 〉 0.001). Stepwise logistic regression analysis identified preoperative MI as an independent risk variable of operative mortality for unstable angina. Separate multivariate analyses were performed to identify the independent predictors for MI and NONMI patients. The multivariate predictors of operative death for MI patients were left ventricular dysfunction, reoperative coronary surgery, nonuse of the internal mammary, age, transmural MI (relative risk 2.11 vs non-Q wave infarction) and left main stenosis. For NONMI patients, the independent variables were urgent operation, left ventricular dysfunction, reoperation, female gender, left main stenosis, and age. The results of this study indicate that recent preoperative MI adversely influences the surgical results in patients with unstable angina. Alternative treatment strategies are warranted for high risk patients, particularly those with transmural MIs and impaired ventricular function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1991.tb00557.x
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  • 7
    Electronic Resource
    Electronic Resource
    Does Coronary Endarterectomy Adversely Affect the Results of Bypass Surgery? (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 8 (1993), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Coronary endarterectomy (TEA) is performed infrequently during coronary artery bypass graft (CABG) surgery due to the impression that it results in higher rates of myocardial infarction (MI), operative mortality (OM), and poor long-term outcome. To assess the effectiveness of TEA, 1, 228 patients undergoing isolated CABG between 1982 and 1989 were evaluated. The incidence of OM (3.2%) and MI (6.0%) following TEA was similar to conventional CABG (OM = 3.8%, MI = 5.5%, p = NS). The incidence of low output syndrome (LOS, 15.1%) and intraaortic balloon pump insertion (IABP, 4.5%) following TEA was similar to conventional CABG (LOS = 12.6%, IABP = 6.0%, p = NS). The highest level of the cardiac specific isoenzyme (CK-MB) released following surgery was similar for the TEA group (46 ± 49) and conventional CABG group (42 ± 44, p = NS). Ventricular dysfunction, urgent surgery, left main stenosis, advanced age, and reoperative surgery were similar in the TEA and conventional CABG groups. At a mean follow-up of 4.2 years, 65.6% of all TEA patients were free of angina, 44.4% were gainfully employed, and 62% were in New York Heart Association Class I. The incidence of late myocardial infarction was 5.4%. The 5-year actuarial survival was 90%. Patients with double TEA and limited TEA (〈 3 cm TEA specimens) tended to have a lower 5-year survival. With strict criteria for selection of TEA patients and with significant technical experience, the short- and long-term results of TEA are comparable to conventional CABG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1993.tb00577.x
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  • 8
    Electronic Resource
    Electronic Resource
    Alkali Metal-Nickel Oxides of the Type MNiO2 (1954)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 76 (1954), S. 1499-1503 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01635a012
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  • 9
    Electronic Resource
    Electronic Resource
    THE ACCUMULATION OF ACETYLMETHYLCARBINOL (3-HYDROXY-2-BUTANONE) BY ACETATE-REQUIRING MUTANTS OF NEUROSPORA CRASSA1 (1953)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 75 (1953), S. 1012-1012 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01100a528
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  • 10
    Electronic Resource
    Electronic Resource
    The Preparation of Triarylsulfonium Halides by the Action of Aryl Grignard Reagents on Diphenyl Sulfoxide (1951)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 73 (1951), S. 1965-1967 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01149a017
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