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Biomedical subjects

S A Sherman

Publications and source records attributed to S A Sherman.

28 records · Page 2Linked to original sources
PubMed1976

Congenital complete heart block. Radiographic findings in 13 patients without associated defects.

The radiographic findings in 13 patients with congenital complete heart block without associated anomalies are presented to illustrate characteristic features. Findings related to the increased stroke volume in these patients include: (a) simulated shunt vasculature; (b) pulmonary venous pypertension with redistribution of blood flow to the upper lungs, and, in one patient, peribronchial edema; (c) cardiomegaly with right ventricular, pulmonary artery, left atrial, left ventricular, and aortic enlargement; and (d) variation in cardiac size on serial examinations. Less commonly seen were findings related to atrioventricular dissociation with transitory marked pulmonary venous hypertension present in one patient when left atrial contraction occurred during ventricular systole when the mitral valve was closed.

Cardiac Output↗
PubMedDate not supplied

[From determination of amino acid residue conformation to reconstruction of the spatial structure of proteins (from the data of nuclear Overhauser enhancement spectroscopy].

A new approach to the calculation of the spatial protein structure based on the joint utilization of the theoretical conformational analysis method and nuclear Overhauser enhancement (NOE) spectroscopy data is proposed and verified. The quality in determining various molecule structural parameters is estimated in terms of the expected NOE spectral parameters derived from the X-ray analysis data of the avian pancreatic polypeptide. The proposed approach is shown to correctly determine such structural parameters of protein molecules as local amino acid residue conformations, reciprocal spatial orientation of the C alpha atoms neighbouring along amino acid sequence and reapproached segments of the polypeptide chain. Spatially remote molecule fragments are mainly responsible for the error in determining structural parameters.

Amino Acids↗
PubMedDate not supplied

Modified Austin bunionectomy with single screw fixation: a comparison study.

The authors present a new modification of the Austin bunionectomy with single 2.7-mm. cortical screw fixation, and a comparison study with the standard osteotomy fixation using a single Kirschner wire. The results include subjective postoperative evaluation as well as objective radiographic analysis. Suggestions are made that this type of procedure is indeed a viable alternative in a large patient population suffering from hallux abducto valgus deformities.

Bone Screws↗
PubMedDate not supplied

[Relation between the spectral NMR parameters and conformation characteristics of the amino acid residue backbone. Analysis of elements of the secondary structure of proteins].

Based on the analysis of the proton-proton distance dependences from the conformational characteristics of the L-amino acid residues, the correlation diagram of the NOE cross peak intensity waited values with the regions of the sterically allowed space (phi, psi) was proposed. The method for determining the dihedral angles phi, psi values using the information about NOE cross peak intensities was elaborated. By the model spectral NMR parameters of the bovine pancreatic trypsin inhibitor, it is shown that the accuracy of the angles phi, psi determination exceed the corresponding accuracy provided by other methods of the structural interpretation of the two-dimensional NMR spectroscopy data. The analysis of the waited spectral NMR parameters for the different types of protein regular secondary structures and beta-turns was performed.

Amino Acids↗
PubMedDate not supplied

Cerebrovascular complications of streptokinase infusion.

Ninety-one patients treated with streptokinase for vascular occlusion were studied retrospectively to document the incidence of cerebral hemorrhage. Three cerebrovascular complications occurred. Two patients had cerebral hemorrhage, one following limb ischemia, the other after acute myocardial infarction. The third patient received streptokinase for an occluded right subclavian bypass graft and suffered a right frontoparietal infarction, presumably secondary to retrograde embolization, but not angiographically proved. This incidence of cerebrovascular complications must be taken within the framework of the baseline incidence following systemic ischemia, but suggests that caution be exercised with this therapy.

Aged↗
PubMedDate not supplied

[Determination and comparative analysis of the conformation of bovine pancreatic trypsin inhibitor and trypsin inhibitors E and K from the data of two-dimensional 1H-NMR spectroscopy].

On the basis of joint consideration of distance dependences between amide proton NH and protons C alpha H, NH, C beta H of the preceding in amino acid sequence residue from the torsion angles phi psi, chi 1, the correlation diagram of these proton-proton distances with the regions of sterically allowed conformational space (phi, psi) is presented and the method for the determination of the L-amino acid residues backbone conformations is proposed. The diagram was used for the determination of backbone conformations of bovine pancreatic trypsin inhibitor and trypsin inhibitors E and K from Dendroaspis polylepis using the data from two-dimensional 1H-NMR spectroscopy. The analysis of backbone conformations was carried out. The individual elements of these protein molecules secondary structure were characterized and their high conformational homology was shown. The inference about qualitative coincidence of three protein molecules conformation in solution, preservation of secondary structure basic elements and their similarity with bovine pancreatic trypsin inhibitor crystalline structure was made.

Amino Acid Sequence↗