Decay of massless Dirac field around the Born-Infeld Black Hole

In this paper we investigate the perturbations by a massless Dirac spinor of a Born-Infeld black hole. The decay rates of the spinor field which is given by the quasinormal mode frequencies are computed using the sixth order WKB approximation. The behavior of the quasi normal modes with the non-linear parameter, temperature and charge of the black hole are analyzed in detail. We also compare the decay rates of the Born-Infeld black hole with its linear counter-part Reissner-Nordstrom black hole.Comment: Latex, 11 figures, references added, new data and new graphs adde

New immunolatex spheres: visual markers of antigens on lymphocytes for scanning electron microscopy

New immunochemical reagents consisting of antibodies bound to small latex spheres were used as visual markers for the detection and localization of cell surface antigens by scanning electron microscopy. Cross-linked latex spheres of various sizes from 300 to 3,4000 Å in diameter were synthesized by aqueous emulsion copolymerization of methacrylate derivatives containing hydroxyl and carboxyl functional groups. Proteins and other molecules containing primary amino groups were covalently bonded to the acrylic spheres under a variety of mild conditions by the aqueous carbodiimide, cyanogen bromide, and glutaraldehyde methods. For use in the indirect immunochemical-labeling technique, goat antibodies directed against rabbit immunoglobulins were bonded to the spheres. These immunolatex reagents were shown to bind only to cells (red blood and lymphocytes) which had previously been sensitized with rabbit antibodies against cell surface antigens. Mouse spleen lymphocytes with exposed immunoglobulins on their surface (B cells) were labeled with these spheres and distinguished from unlabeled or T lymphocytes by scanning electron microscopy. The distribution of Ig receptors on lymphocytes was also studied using the spheres as visual markers. When lymphocytes were fixed with glutaraldehyde and subsequently labeled with the immunolatex reagents, a random distribution was observed by scanning electron microscopy; a patchy distribution was observed when unfixed lymphocytes were used. These results are consistent with studies using ferritin-labeled antibodies (S. De Petris and M. Raff. 1973. Nature [Lond.]. 241:257.) and support the view that Ig receptors on lymphocytes undergo translational diffusion. In addition to serving as visual markers for scanning electron microscopy, these latex spheres tagged with fluorescent or radioactive molecules have applications as highly sensitive markers for fluorescent microscopy and as reagents for quantitative studies of cell surface antigens and other receptors

Dr. A. E. Loen, Inleiding tot de Wijsbegeerte, 3e druk, Boekencentrum N.V., ’s-Gravenhage, 1955, 191 pp

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Boekbesprekings: DR. C. A. Van Peursen, Cultuur en Christelijk Geloof, J. H. Kok N.V., Kampen, 1955, 109 pp

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Dr. S. J. R idderbos , Compromis. Een historische studie over gebod en werklijkheid, J. H. Kok, N.V., Kampen 1955, 153 bls

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DS. M. P. Van Dijk, Gesprekken met de Dood, J. H. Kok N .V., Kampen, 1956, 88 pp

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Dr. A. C. Drogendijk , Man en Vrouw voor en in het Huwelijk. Een Boek over het sexuele Leven voor Gehuwden en Verloofden, 6de druk, J. H. Kok N.V., Kampen, 1955. 223 bls

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Prof. DR. K. J. Popma, Inleiding in de Wijsbegeerte, J. H. Kok N.V., Kampen, 1956, 149pp

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Dr G Brillenbu rg Wur th , Christelijke Zielszorg in het Licht der Moderne Psychologie, J. H. Kok N.V., Kampen 1955, 332 bls

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Dr. P. J. van Leeuwen , Het Christelijk Onsterflikheidsgeloof. Een Bijbels- Dogmatische Studie. Boekencentrum N.V., ’s-Gravenhage (s.j.) 387 bls

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