ISSN:0021-9304    

DOI:10.1002/jbm.820160102

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractA new method of fertility control has been proposed and tested. The technique involves the use of the polymer, which when injected into thevas deferenslowers the pH sufficiently so as to kill the spermatozoa passing through. The polymer provides an acidic environment for a prolonged time and slowly erodes. The fertility may be restored after complete solubility of the polymer itself over a period of time or by flushing it with a suitable solvent. This method of male contraception is nonsurgical, nonocclusive, and reversible.

ISSN:0021-9304    

DOI:10.1002/jbm.820160103

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractThe poly(tetra peptide), H‐ (L·Val1‐L·Pro2‐Gly3‐Gly4)n‐L·Val‐OMe, which is a recurring sequence in tropoelastin the precursor protein of the elastic fiber, has been irradiation crosslinked to produce an elastomeric material with limited strength. When a material such as a Dacron fabric is impregnated by the coacervate phase of the poly(tetra peptide) prior to irradiation crosslinking at 50 Mrad, the crosslinked product exhibits stress–strain curves with good elastomeric properties and high strength. In addition to the stress‐strain curves, the material is characterized by scanning e

ISSN:0021-9304    

DOI:10.1002/jbm.820160104

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractA series of heparinized hydrophilic polymers (H‐RSD) composed of a hydrophobic element, a nonionic hydrophilic element, a cationic element and ionically bound heparin was synthesized. The permeability of the H‐RSD polymers with various chemical compositions and water contents was investigated. From the studies on the permeability, it has been found that in order to maintain good permeability after heparinization, the nonionic hydrophilic element is necessary. In addition, the microencapsulation of activated charcoal granules using a H‐RSD polymer with a similar permeability to that of Cuprophan was examined. In vitro adsorption studies andin vivodirect hemoperfusion studies on the activated charcoal microencapsulated with the H‐RSD polymer, show that the H‐RSD coating prevents clot formation without loss of the absorption power of the activated

ISSN:0021-9304    

DOI:10.1002/jbm.820160105

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractThe biocompatibility and high gas transfer characteristics of gas‐permeable membranes have led to their use for total and supportive cardiopulmonary bypass. The gas transfer rates, particularly of oxygen, have previously been measured with sophisticated apparatus and this has restricted accurate measurements to a few laboratories. A simple chemical technique for measuring the oxygen permeability of synthetic membranes is described, in which sodium hydrosulfite is used to provide the highest possible oxygen gradient and the volume of oxygen crossing the membrane is measured volumetrically. Results agreed with those obtained with orthodox apparatus and replacement of the reducing agent with blood gave much lower oxygen transfer rates demonstrating the rheological influences of the blood upon oxygen transfe

ISSN:0021-9304    

DOI:10.1002/jbm.820160106

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractPhosphorus‐31 nuclear magnetic resonance spectroscopy of phosphoric acid solutions containing zinc and aluminium indicates that zinc forms simple salts in solution, whereas aluminium forms a number of complexes, some of which are polymeric. The formation of the aluminophosphoric acid complexes controls the gelation and strengthening of the dental silicate cement and prevents the formation of crystalline zinc phosphate in the zinc phosphate cemen

ISSN:0021-9304    

DOI:10.1002/jbm.820160107

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractAcute and chronic studies were performed in the canine model to evaluate a new topical hemostatic agent in terms of initial hemostatic capability and tissue/material interaction during the healing process. IP760, a porous amylose succinate material, was applied to large spenic surface wounds in six acute and twelve chronic animals. Microfibrillar collagen (Avitene) was used in twelve chronic animals for comparison. While the hemostatic capabilities of the two agents were comparable, marked differences were noted in the healing response. In the IP760‐treated wound sites the acute inflammatory response, granulation tissue infiltration with fibrosis and healing occurred earlier and in a more homogeneous manner than in the Avitene‐treated wound sites. Healing of the IP760‐treated wounds occurred concomitantly with the development of granulation tissue and fibrosis and the rapid resorption of the

ISSN:0021-9304    

DOI:10.1002/jbm.820160108

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractPhase relationships in cast CoCr surgical implant alloys, heat treated at temperatures from 1180 to 1300°C, are reported. Interdendritic material was identified by selected area diffraction as a quaternary near eutectic mixture between sigma phase, M23C6, M7C3, and fcc Co. Incipient melting and subsequent resolidification of this near‐eutectic mixture accounts for observations of behavior at temperatures above 1235°C. At temperatures just below its melting point the interdendritic material initially breaks down to M23C6, which subsequently dissolves in the Co m

ISSN:0021-9304    

DOI:10.1002/jbm.820160109

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

摘要:

AbstractIn addition to Sn‐rich corrosion products found in conventional amalgams, Cu‐rich amalgams also form Cu‐containing corrosion products. The nature of these Cu‐rich products was investigated by immersion of samples of 13 Cu‐rich amalgam systems in Ringer's solution for prolonged periods. SEM/EDS and x‐ray diffraction studies were used to identify the compounds formed and their morphology. Two products were identified: Cu2O, a red product, and CuCl2·3Cu(OH)2, a g

ISSN:0021-9304    

DOI:10.1002/jbm.820160110

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY

ISSN:0021-9304    

DOI:10.1002/jbm.820160111

出版商:John Wiley&Sons    

年代:1982

数据来源: WILEY