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  • GEOPHYSICS  (187)
  • ASTROPHYSICS  (127)
  • Biochemistry and Biotechnology
  • CHEMISTRY
  • STRUCTURAL MECHANICS
  • 1985-1989  (396)
  • 1970-1974
  • 1960-1964
  • 1985  (396)
Collection
Keywords
Publisher
Years
  • 1985-1989  (396)
  • 1970-1974
  • 1960-1964
Year
  • 1
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    The missing bulge globular clusters in M31 - New optical candidates (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new method to attack the question of the 'missing' globular clusters in the bulge of M31 is used. Image-processing techniques were used on 13 videocamera fields to obtain an accurate photometric census of stellar objects in M31's bulge down to a limiting B magnitude of 21. This luminosity distribution is compared with the Bahcall-Soneira model of galactic foreground stars. A statistically significant excess of bright images in the luminosity range of globular clusters at M31's distance is found. If the optical candidates considered prove to be globular clusters, they would double the number of known globular clusters in the surveyed region. The colors of a subsample of the candidates are the same as those of the known globular clusters. It is concluded that the previously observed flattening away from a de Vaucouleurs law in the radial distribution of M31 may be an observational selection effect. As an offshoot of this analysis, no evidence is found for very luminous stars in the inner bulge of M31. The lack of such stars indicates that there has not been active star formation (with a normal IMF) in the recent past. Coupled with the existence of many planetary nebulae in the bulge, this may strengthen the case for a galactic wind in M31's bulge.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 290; 140-153
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    NASA TECHNICAL REPORTS
  • 2
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    The neutral wind 'flywheel' as a source of quiet-time, polar-cap currents (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The neutral wind pattern over the summer polar cap can be driven by plasma convection to resemble the convection pattern. For a north-south component of the interplanetary magnetic field Bz directed southward, the wind speeds in the conducting E-region can become approximately 25 percent of the electric field drift speeds. If convection ceases, this neutral wind distribution can drive a significant polar cap current system for approximately 6 hours. The currents are reversed from those driven by the electric fields for southward Bz, and the Hall and field-aligned components of the current system resemble those observed during periods of northward Bz. The current magnitudes are similar to those observed during periods of small, northward Bz; however, observations indicate that electric fields often contribute to the currents as much as, or more than, the neutral winds.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 12; 101-104
    Format: text
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  • 3
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    Transport of ozone in the middle stratosphere - Evidence for planetary wave breaking (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Data from the Nimbus 7 Limb Infrared Monitor of the Stratosphere (LIMS) for the period October 25, 1978-May 28, 1979 are used in a descriptive study of ozone variations in the middle stratosphere. It is shown that the ozone distribution is strongly influenced by irreversible deformation associated with large amplitude planetary-scale waves. This process, which has been described by McIntyre and Palmer as planetary wave breaking, takes place throughout the 3-30 mb layer, and poleward transport of ozone within this layer occurs in narrow tongues drawn on the tropics and subtropics in association with major and minor warming events. These events complement the zonal mean diabatic circulation in producing significant changes in the total column amount of ozone.
    Keywords: GEOPHYSICS
    Type: Journal of the Atmospheric Sciences (ISSN 0022-4928); 42; 230-244
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  • 4
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    Heavy ion beam-ionosphere interactions - Electron acceleration (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Moore et al. (1982) described a number of unexpected effects which were observed during the first Argon Release Controlled Study (ARCS 1, or rocket flight 29:014). The present paper provides a description of detailed analyses of the interaction of the argon beam with the ionosphere. An important feature of the considered test was that all detectors and the Ar(+) gun remained attached to the rocket throughout the flight. It is pointed out that the most dramatic effect of ion gun operation on ARCS 1 involved large changes in the fluxes of electrons with energies below about 600 eV. The observations are discussed, taking into account the distribution functions, azimuth dependence, and electron and ion trajectories. Attention is given to the perpendicular ion beam, the parallel ion beam, the acceleration of downgoing and upgoing electrons, and aspects of wave generation.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 9595-961
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of phosphate, glucose, and ammonium on cell growth and lincomycin production by Streptomyces lincolnensis in chemically defined media (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 327-333 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cell growth and lincomycin production were measured in batch cultures of Streptomyces lincolnensis in chemically defined media. In these fermentations the specific rate of antibiotic production was maximal during growth and always declined at the end of the growth phase. It was found that both phosphate and ammonium salts, while required for cell growth, had negative effects on antibiotic production. By increasing the concentration of magnesium sulfate, it was possible to increase both the production rates and final titers of lincomycin. The mechanism for this effect was found to be the reduction of soluble phosphate in the medium through the precipitation of ammonium magnesium phosphate. Lincomycin production rates were not inhibited by glucose at concentrations of up to 30 g/L.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260270318
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  • 6
    Electronic Resource
    Electronic Resource
    Design of a system for the control of low dissolved oxygen concentrations: Critical oxygen concentrations for Azotobacter vinelandii and Escherichia coli (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 151-155 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The physiological activity of microorganisms in environments with low dissolved oxygen concentrations often differs from the metabolic activity of the same cells growing under fully aerobic or anaerobic conditions. This article describes a laboratory-scale system for the control of dissolved oxygen at low levels while maintaining other parameters, such as agitator speed, gas flowrate, position of sparger outlet, and temperature at fixed values. Thus, it is possible to attribute in dilute nonviscous fermentations all physiologic changes solely to changes in dissolved oxygen. Experiments were conducted with Azotobacter vinelandii and Escherichia coli. Critical oxygen concentrations for growth (that value of oxygen allowing growth at 97% of μmax) were measured as 0.35 ± 0.03 mg/L for A. vinelandii and 0.12 ± 0.03 mg/L for E. coli. These values are significantly different from the commonly quoted values for critical oxygen concentrations based on respiration rates. Because of the superior dissolved oxygen control system and an improved experimental protocol preventing CO2 limitation, we believe that the values reported in this work more closely represent reality.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260270208
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  • 7
    Electronic Resource
    Electronic Resource
    Alterations in synthesis of the acid soluble proteins from nuclei of specific phases of the in vivo liver cell cycle after isoproterenol and sodium phenobarbital administration: An electrophoretic study (1985)
    Weinheim : Wiley-Blackwell
    Electrophoresis 6 (1985), S. 306-313 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Partially hepatectomized mice were injected intraperitoneally with isoproterenol (IPR), sodium phenobarbital (PB), or a combination of the two, and the regenerating lobe of the liver was removed. Nuclei were isolated, electrostatically sorted from various phases of the cell cycle, and the acid-soluble proteins were extracted. Synthesis of several high-molecular weight non-histone proteins were observed in two-dimensional polyacrylamide gel electrophoretic autoradiographs after independent administration of IPR and PB. The histones revealed alterations in synthesis patterns and the histone variants demonstrated concentration changes in response to these drugs. A protein designated as “a” appeared in G0 + G1 phase nuclei after IPR treatment and showed an increase in concentration after PB was included in the dosing regime. This protein displayed homology with a non-histone protein from calf thymus when its mobility and amino acid content was examined.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150060703
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  • 8
    Electronic Resource
    Electronic Resource
    Quantitative reproducibility of measurements from Coomassie Blue-stained two-dimensional gels: Analysis of mouse liver protein patterns and a comparison of BALB/c and C57 strains (1985)
    Weinheim : Wiley-Blackwell
    Electrophoresis 6 (1985), S. 592-599 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Using the ISO-DALT system for two-dimensional (2-D) electrophoresis and the TYCHO system for computer analysis of the resulting protein maps, we obtained high quality quantitative protein abundance data from Coomassie Brilliant Bluestained gels of mouse liver samples. High resolution gels allow more than 100 proteins to be measured with coefficients of variation less than 15 %. A comparison of results from two mouse strains (C57BL/6 and BALB/c) and the cross between them (BCF1) shows that a large number of qutive polymorphisms can be detected, and that, as expected, the amount of protein produced in the heterozygote is intermediate between the parental values. The system described is shown to be capable of reliably detecting decreases in protein abundance such as those expected to result from radiation-induced deletion of one copy of a gene. The implications of these results for the study of gene regulation are discussed in relation to applications in genetics, toxicology, and differentiation.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150061205
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  • 9
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    SM-ND isotopic studies of proterozoic anorthosites Systematics and implications (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Sm-Nd isotopic studies of anorthosites can be used to provide information on their ages of crystallization and metamorphism, contamination history, and mantle sources. Proterozoic anorthosites in the Grenville and Nain Provinces of eastern North America crystallized between about 1100 and 1600 Ma, and some were metamorphosed at about 1000 Ma. Grenville Province anorthosite massifs were derived from depleted mantle. It is not clear whether massifs and related mafic intrusions throughout the Nain Province of Labrador were derived from enriched mantle, or were contaminated by early Archean (greater than 3500 Ma) silicic crustal materials, heretofore thought to be restricted to coastal Labrador.
    Keywords: GEOPHYSICS
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  • 10
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    Global lower mesospheric water vapor revealed by LIMS observations (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Limb Infrared Monitor of the Stratospheric water vapor channel data analysis has been extended from the 1. mb level (about 48 km) to the .3 mb level (about 60 km) through a radiance averaging procedure and better understanding of systematic errors. The data show H2O mixing ratio peaks near the .5 mb level varying from 4 to 7 ppmv with latitude and season. Above this level the mixing ratio drops off quickly with altitude, but, due to experimental uncertainties, at an uncertain rate. The stratospheric results are virtually the same as determined from the archived LIMS results with a tropical hygropause and enhanced H2O concentration in the lower levels at high winter latitudes.
    Keywords: GEOPHYSICS
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