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Digitale Medien

A liquid-helium cryostat for collection of three-dimensional X-ray intensity data down to 20 K. The crystal structure of D(+)-tartaric acid at 35, 105, 160 and 295 K (1979)

Albertsson, J. ; Oskarsson, Å. ; Ståhl, K.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 12 (1979), S. 537-544

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Details

ISSN: 1600-5767

Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Thema: Geologie und Paläontologie , Physik

Notizen: A Be-walled conduction cooling He(l) cryostat intended for the interval 20–80 K and the κ geometry of the CAD4 X-ray diffractometer is described. Three-dimensional X-ray intensity data can be collected in the interval − 45 〈 χ 〈 45° with the temperature stability maintained within ± 1 K. The experimental problems caused by centering an unseen crystal and by the absorption and scattering in the Be walls are discussed. D(+)-tartaric acid, C4H6O6, was chosen as a test compound. Only minor differences occur in its crystal and molecular geometry between 295 and 35 K.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1107/S0021889879013224

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Digitale Medien

Human chorionic gonadotropin: Doubtful role as an inhibitor of cell-mediated immunity (1977)

Bean, M. A. ; Salser, J. S. ; Newman, M. ; [weitere]

Springer

Cancer immunology immunotherapy 2 (1977), S. 85-90

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Details

ISSN: 1432-0851

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary HCG preparations from several commercial sources were tested for their ability to inhibit mitogen-induced lymphocyte blastogenesis. Proven biologically active preparations were found to vary widely in their ability to suppress PHA response, in their toxicity to lymphocytes, and in their anti-tryptic activity. Since high concentrations of a low toxicity, low trypsin inhibitor-containing preparation did not suppress blastogenesis, we conclude that previous reports of HCG being a potent inhibitor of CMI are erroneous and the effect observed by others probably due to contaminants of the HCG preparations used in their assay systems. Our findings cast doubt on the validity of the hypothesis that HCG is a potent inhibitor of CMI and therefore of importance in the role of maternal tolerance to the fetal allograft and in escape of HCG-secreting tumors from the host immune system.