Mean geometry of the thiopeptide unit and conformational features of dithiopeptides and polythiopeptides.

The mean geometry of the thiopeptide [Ca-N-C(=S)-Ca] unit has been derived from an analysis of X-ray crystal structure data, as well as MM2 and Gaussian 80/82 calculations. The conformational flexibilities of dithiopeptides with glycl- and alanyl-side chains have been investigated by molecular mechanics. Minimum energy conformations were examined using interactive computer graphics molecular modeling techniques.

Assessment for evidence of non A-non B hepatitis in patients given n-heptane-suspended heat-treated clotting factor concentrates.

Nineteen patients, (2 adults, 17 children) with inherited bleeding disorders were infused with n-heptane-suspended-heated clotting factor concentrates. Twelve of the nineteen were previously untreated. Six patients were infused with Profilnine Heat-Treated and 13 with Profilate Heat-Treated.

Geometry of proline and hydroxyproline I: An analysis of X-ray crystal structure data.

We have carried out an analysis of crystal structure data on prolyl and hydroxyprolyl moieties in small molecules. The flexibility of the pyrrolidine ring due to the pyramidal character of nitrogen has been defined in terms of two projection angles delta 1 and delta 2. The distribution of these parameters in the crystal structures is found to be consistent with results of the energy calculations carried out on prolyl moieties in our laboratory.

Osteogenesis imperfecta type III. Delineation of the phenotype with reference to genetic heterogeneity.

The existence of a rare form of osteogenesis imperfecta, OI type III, has been postulated. This is characterized by autosomal recessive inheritance with neonatal manifestations of bone fragility or deformability. It is usually nonlethal.

Comprehensive management of haemophilia.

Haemophilia is a congenital, life-long disorder that may cause major disabilities. The goal of comprehensive care is to prevent problems when possible, to treat early in order to minimize morbidity, and to restore function to disabled patients. The co-ordinated efforts of many experts are needed for success.

Low levels of mercury inhibit the respiratory burst in human polymorphonuclear leukocytes.

The objective of this investigation was to examine the effects of low levels of Hg(II) on the respiratory burst of PMNs by monitoring O2 consumption, superoxide radical formation, and chemiluminescence. Hg(II) at concentrations of 10-100 ng/ml profoundly inhibited zymosan-stimulated human cells. This inhibition was immediate in onset and occurred with minimal loss of cell viability.

Hematologic management of hemophilia A for surgery.

From mid-1967 to mid-1983, three hundred fifty surgical operations were performed on 163 patients with hemophilia A, without factor VIII inhibitor. One death occurred, in a patient with a serious head injury. Postoperative hemorrhages occurred after 23% of operations, but the incidence after surgery on the knee, 40%, was decidedly higher than the 15% incidence after operations at other sites.

Monitoring the iodine dose.

The administration of large amounts of iodinated contrast media can result in acute renal failure. Many diagnostic examinations, including pyelography, computed tomography and digital vascular imaging, require the injection of significant amounts of contrast media. Additionally, these examinations may be performed within 24-48 hours of each other, increasing the likelihood of a dose-induced acute renal failure.

Crystallography, quantitative structure-activity relationships, and molecular graphics in a comparative analysis of the inhibition of dihydrofolate reductase from chicken liver and Lactobacillus casei by 4,6-diamino-1,2-dihydro-2,2-dimethyl-1-(substituted-phenyl)-s-triazine s.

The inhibition of dihydrofolate reductase from chicken liver and from Lactobacillus casei has been studied with 4,6-diamino-1,2-dihydro-2,2-dimethyl-1-(substituted-phenyl)-s-triazines. It was found that for the chicken enzyme, inhibitor potency for 101 triazines was correlated by the following equation: log 1/Kiapp = 0.85 sigma tau' - 1.

Bowel training for children with neurogenic dysfunction: a follow-up.

Fifty children with neurogenic bowel dysfunction and stool incontinence received in patient bowel regulation training and were interviewed an average of 1.2 years later. Twenty-eight were males.

Comparison of the inhibition of methotrexate-sensitive and -resistant Lactobacillus casei cell cultures with purified Lactobacillus casei dihydrofolate reductase by 4,6-diamino-1,2-dihydro-2,2-dimethyl-1-(3-substituted-phenyl)-s-triazines. Use of quantitative structure-activity relationships in making inferences about the mechanism of resistance and the structure of the enzyme is situ compared with the enzyme in vitro.

The inhibitory action of a set of 4,5-diamino-1,2-dihydro-2,2-dimethyl-1-(3-substituted-phenyl)-s-triazines on Lactobacillus casei dihydrofolate reductase is compared with their action on methotrexate-resistant and methotrexate-sensitive cell cultures by means of quantitative structure-selectivity analysis. The analysis uncovers major differences in the steric and hydrophobic interactions of the substituents X with the three different systems. Correlation analysis is used to define the hydrophobic binding site for 3-X in the isolated enzyme.

Behavioral medicine in pain and analgesia management for the hemophilic child with factor VIII inhibitor.

The present report describes the application of self-regulation techniques (progressive muscle relaxation, meditative breathing, and guided imagery) to the management of bleeding and arthritic pain and analgesic dependence in a 9-year-old hemophilic child with factor VIII inhibitor. Self-regulation training was effective in decreasing pain intensity and analgesic dependence, with 1-year follow-up demonstrating substantial improvements across both medical and psychosocial parameters.

Interaction of light and temperature on the germination of Rumex obtusifolius L.

Seeds (nutlets) of Rumex obtusifolius L. fail to germinate in darkness at 25° C, but are stimulated by short exposure to red light (R) the effectiveness of which can be negated by a subsequent short exposure to far red light (F) indicating phytochrome control. Short periods of elevated temperature treatment (e.