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Hydrogen-deficient atmospheres for cool carbon stars (1985)

Luttermoser, D. G. ; Johnson, H. R. ; Alexander, D. R. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: Motivated by recent work which hints at a possible deficiency of hydrogen in non-Mira N-type carbon stars and to further explore the parameter space of chemical composition, computations have been made of a series of hydrogen-deficient models for carbon stars. For these models Teff = 3000 K, and log g = 0.0. Solar abundances are used for all elements except for carbon (which is enhanced to give C/O = 1.05), hydrogen, and helium. As the fractional abundance of hydrogen is decreased, being replaced by helium, the temperature-optical depth relation is affected only slightly, but the temperature-pressure relation is changed. The most striking change in the emergent flux is the decrease of the H(-) peak at 1.65 micron compared with the blackbody peak at 1.00 micron.

Schlagwort(e): ASTROPHYSICS

Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 292; 228-230

Format: text

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Digitale Medien

Pharmacological profile of the substituted beta-lactam L-659,286: A member of a new class of human PMN elastase inhibitors (1989)

Bonney, R. J. ; Ashe, B. ; Maycock, A. ; [weitere]

New York, N.Y. : Wiley-Blackwell

Journal of Cellular Biochemistry 39 (1989), S. 47-53

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ISSN: 0730-2312

Schlagwort(e): elastase inhibitors ; β-lactams ; lung damage ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Chemie und Pharmazie , Medizin

Notizen: Human polymorphonuclear leukocyte elastase (PMN elastase) is inhibited by L-659, 286 (7α-methoxy-8-oxo-3-[[(1,2,5,6-tetrahydro-2-methyl-5,6-dioxo-1,2,4-triaz-in-3-yl)thio]methyl]-5-thia-1-aza-6R-bicyclo [4.2.O]oct-2-ene-2-pyrrolidine carboxamide-5,-dioxide) with a Ki of 0.4 μM. This inhibition is time-dependent, rapid, and only slowly reversible, with a t1/2 of 〉 3 days at 25°C. L-659, 286 is also highly selective for PMN elastase, as it does not inhibit thrombin, trypsin, papain, plasmin, chymotrypsin, or cathepsin G. L-659, 286 administered intratracheally inhibits lung damage caused by administration via the same route of human PMN elastase into hamsters. In marmosets, L-659, 286 is cleared from blood very rapidly after an intravenous injection but is recovered in bronchoalveolar lavage fluid for several hours after intratracheal administration.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jcb.240390106

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3

Digitale Medien

Perturbation of the switch-on of transcriptase activity in intermediate subviral particles from reovirus (1982)

Borsa, J. ; Sargent, M. D. ; Ewing, D. D. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Cellular Physiology 112 (1982), S. 10-18

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ISSN: 0021-9541

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Notizen: Intermediate subviral particles (ISVP) derived from reovirus represent a simple model system for the switch-on of transcriptase function. In such particles the endogenous transcriptase is present in a switched-off form, one step removed from the switched-on state. Switch-on of transcriptase function is an active process in this system and can be triggered by K+ ions. A variety of agents which affect gene expression in cells were tested for an effect on switch-on in ISVP. Marked effects on switch-on in ISVP were observed with a diverse group of test agents, including DMSO and other solvents, BUdR, TdR, caffeine, theophylline, and temperature. The correlation in response between ISVP and cells suggests that the ISVP system may be useful as a model for studying the biochemical mechanisms underlying the perturbative effects of such agents on gene expression in cells.

Zusätzliches Material: 14 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jcp.1041120104

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4

Digitale Medien

Inhibition of the metabolism of ram spermatozoa by derivatives of α-chlorohydrin (1981)

Brown-Woodman, P. D. C. ; White, I. G. ; Ridley, D. D.

New York, NY : Wiley-Blackwell

Gamete Research 4 (1981), S. 203-217

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ISSN: 0148-7280

Schlagwort(e): α-chlorohydrin ; antifertility agent ; ram ; sperm metabolism ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie

Notizen: The effects of the male antifertility agent, α-chlorohydrin, six of its derivatives, and glycidol were studied on the metabolism of washed ram spermatozoa in vitro with fructose as substrate. The α-chlorohydrin derivatives were the amino, the phosphorylated, and four glycol-bridge (ketal) compounds. All compounds except glycidol, in a concentration between 0.1 and 100 mM, reduced the aerobic glycolsis and/or oxidation of fructose. However, there was not a high correlation between the ability of these compounds to inhibit the metabolism of ram spermatozoa in vitro and their antifertility activity when administered to male rats. Other factors are clearly involved in their antifertility activity, eg, the concentration of the compounds in the epididymis and their conversion of either more or less spermicidal compounds in the body.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mrd.1120040305

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Digitale Medien

Morphological and ultrastructural characterization of mammalian spermatozoa processed for flow cytometric DNA analyses (1984)

Garner, D. L. ; Johnson, L. A. ; Lake, S. ; [weitere]

New York, NY : Wiley-Blackwell

Gamete Research 10 (1984), S. 339-351

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ISSN: 0148-7280

Schlagwort(e): spermatozoa ; flow cytometry ; DNA staining ; nuclear morphology ; ultrastructure ; mammals ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie

Notizen: The morphological and ultrastructural changes that occur during preparation of porcine, bovine, and murine spermatozoa for flow cytometric quantification of the relative DNA content of the X- and Y-chromosome-bearing sperm populations were examined. Ejaculated spermatozoa from the boar and bull were washed using a series of dimethyl sulfoxide (DMSO) solutions prior to fixation, whereas the epididymal mouse spermatozoa were washed only in phosphate-buffered saline (PBS). Spermatozoa from all three species were then fixed in ethanol and processed for fluorochrome staining by a treatment regimen consisting of sulfhydryl reduction and proteolysis. The processed sperm nuclei were stained for DNA with the fluorochrome, 4′-6-diamidino-2-phenylindole (DAPI) before quantification by flow cytometry. Scanning and transmission electron micrographs of sperm heads taken at various steps of the preparation and staining procedures show 1) that the rigorous washing procedure disrupted the plasma and outer acrosomal membranes, 2) that ethanol fixation resulted in removal of the outer membranes and disintegration of the nuclear envelope, and 3) that thiol and proteolysis treatment removed the remaining cellular organelles including the tail and rapidly induced partial decondensation of the tightly packed chromatin. Sequential micrographs showed that the nuclear matrix of all three species increased in thickness about twofold during the preparation and staining. Consequently, the harsh procedures currently used for quantitative staining of DNA for high-resolution flow cytometric analyses destroy most cellular organelles and thereby prevent simultaneous characterization of DNA content and other sperm cell constituents.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mrd.1120100402

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6

Digitale Medien

Bubble formation in animals. I. Physical factorsThis work has been aided since July 1, 1942, by grants from the Committee on Aviation Medicine of the National Research Council carried out under contract recommended by the Committee on Medical Reseach between the Office of Scientific Research and Development and Princeton University. (1944)

Harvey, E. Newton ; Barnes, D. K. ; McElroy, W. D. ; [weitere]

Philadelphia : Wiley-Blackwell

Journal of Cellular and Comparative Physiology 24 (1944), S. 1-22

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ISSN: 0095-9898

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jcp.1030240102

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Digitale Medien

Bubble formation in animals. II. Gas nuclei and their distribution in blood and tissuesThis work has been aided since July 1, 1942, by grants from the Committee on Aviation Medicine of the National Research Council carried out under contract recommended by the Commitee on Medical Reseach between the Office of Scientific Research and Development and Princeton University. Reference will not be made to progress reports or other literature of the Committee on Aviation Medicine. (1944)

Harvey, E. Newton ; Whiteley, A. H. ; McElroy, W. D. ; [weitere]

Philadelphia : Wiley-Blackwell

Journal of Cellular and Comparative Physiology 24 (1944), S. 23-34

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ISSN: 0095-9898

Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie , Medizin

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jcp.1030240103

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8

Digitale Medien

Plant tubulin genes: Structure and differential expression during development (1987)

Silflow, Carolyn D. ; Oppenheimer, David G. ; Kopozak, Steven D. ; [weitere]

Chichester [u.a.] : Wiley-Blackwell

Developmental Genetics 8 (1987), S. 435-460

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ISSN: 0192-253X

Schlagwort(e): tubulin genes ; microtubules ; Arabidopsis thaliana ; Life and Medical Sciences ; Genetics

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Biologie

Notizen: Microtubules are important components of the cytoskeleton of plant cells and play key roles in plant growth and morphogenesis. Recent molecular studies have begun to elucidate the structure and expression of plant genes coding for the major components of microtubules, α- and β-tubulin. Tubulin amino acid sequences deduced from the DNA sequences of eight higher plant tubulin genes are 79-87% homologous with constitutively expressed mammalian tubulins. The genome of the model plant system Arabidopsis thaliana contains four dispersed α-tubulin sequences and at least seven β-tubulin sequences, only two of which appear to be linked. Of the five A. thaliana genes whose expression has been analyzed, the transcripts of one α-tubulin and one β-tubulin gene are constitutively expressed in roots, leaves, and flowers. A second α-tubulin gene is expressed predominately in flowers; the transcripts of the second and third β-tubulin genes are found predominately in leaves or in roots, respectively.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/dvg.1020080511

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VLBI observations of the nucleus of Centaurus A (1982)

Morabito, D. D. ; Jauncey, D. L. ; Wehrle, A. E. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-07-13

Schlagwort(e): ASTROPHYSICS

Materialart: Extragalactic radio sources; Aug 03, 1981 - Aug 07, 1981; Albuquerque, NM

Format: text

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Arcsecond positions for milliarcsecond VLBI nuclei of extragalactic radio sources. IV - Seventeen sources (1986)

Morabito, D. D. ; Jauncey, D. L. ; Linfield, R. P. ; [weitere]

In: Other Sources

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Publikationsdatum: 2011-08-19

Beschreibung: VLBI measurements of time delay and delay rate at 2.29 and 8.42 GHz on baselines of 10,000 km have been used to determine the positions of the milliarcsecond nuclei in 17 extragalactic radio sources with estimated accuracies of 0.1 to 0.3 arcsec. The observed sources are part of an all-sky VLBI catalog of milliarcsecond radio sources. In addition, slightly improved positions are presented for 101 sources originally reported by Morabito et al. (1983). Arcsecond positions have now been determined for 836 sources.

Schlagwort(e): ASTROPHYSICS

Materialart: Astronomical Journal (ISSN 0004-6256); 92; 546-551

Format: text

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