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  • 1
    Electronic Resource
    Electronic Resource
    Antarctic marine life under the McMurdo Ice Shelf at White Island: A link between nutrient influx and seal population (1984)
    Springer
    Polar biology 2 (1984), S. 229-231 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Throughout 1981, the first routine collections of a variety of fish were made under the McMurdo Ice Shelf near White Island, Antarctica. Estimates of their local biomass were calculated using food consumption patterns of resident seals. Since no significant primary production occurs at White Island, the resident fauna must be maintained by a large nutrient influx from the Ross Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263629
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  • 2
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    Antarctic marine life under the McMurdo Ice Shelf at White Island: A link between nutrient influx and seal population (1984)
    Springer
    Details
    Publication Date: 1984-02-01
    Print ISSN: 0722-4060
    Electronic ISSN: 1432-2056
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Molecular aspects of the imipramine ‘receptor’ (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 782-794 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01951960
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  • 4
    Electronic Resource
    Electronic Resource
    Predatory control of copepod seasonal cycles on Georges Bank (1984)
    Springer
    Marine biology 82 (1984), S. 31-40 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A stimulation model of copepod population dynamics (development rate, fecundity, and mortality) was used to compute the predatory consumption necessary to control population growth in three dominant copepod species (Pseudocalanus sp., Paracalanus parvus, and Calanus finmarchicus) on Georges Bank, given observed seasonal cycles of copepod and predator populations. The model also calculated secondary production of each species. Copepod development rate and fecundity were functions of temperature while mortality was a function of predator abundance and consumption rate. Daily inputs of temperature and predator abundance (chaetognaths, ctenophores, and Centropages spp.) were derived from equations fit to field data. Model runs were made with various consumption rates until the model output matched observed copepod seasonal cycles. Computed consumption rates were low compared with published values from field and laboratory studies indicating that, even at conservative estimates of consumption, predators are able to control these copepod populations. Combined annual secondary production by the small copepod species, Pseudocalanus sp. and P. parvus, was nearly twice that of the larger C. finmarchicus with P. parvus having the highest total annual production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392761
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  • 5
    Electronic Resource
    Electronic Resource
    Food concentrations on Georges Bank: non-limiting effect on development and survival of laboratory reared Pseudocalanus sp. and Paracalanus parvus (Copepoda: Calanoida) (1984)
    Springer
    Marine biology 82 (1984), S. 41-46 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory and field studies were used to show that development rate and survival of the copepods Pseudocalanus sp. and Paracalanus parvus are generally not food limited on Georges Bank. Copepods were reared in the laboratory at a series of phytoplankton concentrations (25 to 200 μg carbon l-1) spanning the range of particulate carbon and nitrogen measured on Georges Bank in October, 1978 and February, 1979. Pseudocalanus sp. and P. parvus were reared at 5° and 12°C, respectively. Development rate and survival in both species were not affected at Georges Bank food concentrations but were reduced at lower food levels. Development times from hatching to adulthood was 60 to 70 d for Pseudocalanus sp. and 25 to 30 d for P. parvus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392762
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  • 6
    Electronic Resource
    Electronic Resource
    A haemodynamic and pharmacokinetic study to assess a new transdermal nitroglycerin preparation in normal subjects (1984)
    Springer
    European journal of clinical pharmacology 26 (1984), S. 293-296 
    Details
    ISSN: 1432-1041
    Keywords: nitroglycerin ; transdermal application ; echocardiography ; plasma nitroglycerin levels ; normal subjects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A continual application of a transdermal Nitroglycerin (Nitrodur) has been haemodynamically and pharmacokinetically assessed in a group of 10 normal healthy volunteers over a 24 h period. There were significant decreases in left ventricular end systolic dimension and end diastolic dimension over this period, demonstrating a continuous haemodynamic effect. A dose related response was not demonstrated, although low plasma nitroglycerin levels produced significant haemodynamic changes. The persistant decrease in left ventricular wall stress implies a reduction in myocardial oxygen consumption. Thus Nitrodur may play an important role in the long term prophylaxis of angina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00548757
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  • 7
    Electronic Resource
    Electronic Resource
    Observations of the reappearance of polar coronal holes and the reversal of the polar magnetic field (1984)
    Springer
    Solar physics 92 (1984), S. 109-132 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examine observations relating to the evolution of the polar magnetic field around sunspot maximum, when the net polar flux reverses polarity and coronal holes redevelop around the poles. Coronal hole observations during the last two solar maxima are examined in detail. Long-term averages of the latitudinal dependence of the photospheric magnetic field and the evolutionary pattern of the polar crown filaments are used to trace the poleward motion of the reversal of the large-scale surface field, and are compared to the redevelopment of the polar holes. The polar holes evolve from small, mid-latitude holes of new-cycle polarity which expand poleward until they join and cover the pole. We find that the appearance of these mid-latitude holes, the peak of flux emergence at low latitudes, and the polar polarity reversal all occur within a few solar rotations. Lagging 6 months to 1 1/2 yr after this time, the polar crown disappears and the polar holes redevelop. These results are examined in the context of phenomenological models of the solar cycle. We believe the following results in particular must be accounted for in successful models of the solar cycle: (1) The process of polarity reversal and redevelopment of the polar holes is discontinuous, occurring in 2 or 3 longitude bands, with surges of flux of old-cycle polarity interrupting the poleward migration of new-cycle flux. There is a persistent asymmetry in these processes between the two hemispheres; the polarity reversal in the two hemispheres is offset by 6 months to 1 1/2 yr. (2) Contrary to the Babcock hypothesis, the polar crown disappears months after the magnetic polar reversal. We suggest one possible scenario to explain this effect. (3) Our observations support suggestions of a poleward meridional flow around solar maximum that cannot be accounted for by Leighton-type diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157239
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  • 8
    Electronic Resource
    Electronic Resource
    The spatial distribution of 6 centimeter gyroresonance emission from a flaring X-ray loop (1984)
    Springer
    Solar physics 92 (1984), S. 271-281 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We compare simultaneous high resolution soft X-ray and 6 cm images of the decay phase of an M3 X-ray flare in Hale Region 16413. The photographic X-ray images were obtained on an AS & E sounding rocket flown 7 November, 1979, and the 6 cm observations were made with the VLA. The X-ray images were converted to arrays of line-of-sight emission integrals and average temperature throughout the region. The X-ray flare structure consisted of a large loop system of length ∼ 1.3 arc min and average temperature ∼8 × 106 K. The peak 6 cm emission appeared to come from a region below the X-ray loop. The predicted 6 cm flux due to thermal bremsstrahlung calculated on the basis of the X-ray parameters along the loop was about an order of magnitude less than observed. We model the loop geometry to examine the expected gyroresonance absorption along the loop. We find that thermal gyroresonance emission requiring rather large azimuthal or radial field components, or nonthermal gyrosynchrotron emission involving continual acceleration of electrons can explain the observations. However, we cannot choose between these possibilities because of our poor knowledge of the loop magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157251
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  • 9
    Electronic Resource
    Electronic Resource
    Unilateral lesions of the hamster suprachiasmatic nuclei: evidence for redundant control of circadian rhythms (1984)
    Springer
    Journal of comparative physiology 154 (1984), S. 221-232 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Several properties of vertebrate circadian rhythms can be attributed to the behavior of an underlying pacemaker system which is composed of two separate but mutually interacting circadian oscillators. As originally formulated, the model for such a pacemaker system proposed that two oscillators or populations of oscillators have different properties, specifically in their responses to light (Pittendrigh 1974; Pittendrigh and Daan 1976b). We have tested the proposition that the right and left suprachiasmatic nuclei (SCN) of the golden hamster contribute in different ways to the regulation of circadian rhythmicity by measuring the wheel-running activity rhythms of hamsters with lesions to either the right or left SCN. Although effects of unilateral or other partial SCN lesions on pacemaker properties were observed, these effects were not different in hamsters receiving right- or left-side lesions. More specifically: (1) free-running period (τ) in constant light was shorter in lesioned hamsters irrespective of the side lesioned (Fig. 3a), and the total amount of SCN destruction was found to correlate with τ (Fig. 4). (2) Phase-angle difference (Ψ) of some lesioned hamsters (both right- and left-side) during entrainment to L∶D, 14∶10 was significantly more positive than that of controls (Fig. 3b). (3) The rate of phase-shift following a shift of the light/dark cycle was not different in hamsters with right- or left-side lesions (Fig. 3c). And (4) the simultaneous expression of different circadian periods, similar to ‘splitting’, was observed in hamsters with unilateral lesions (Fig. 5). It is concluded that the right and left SCN are similar in their contributions to the control of circadian rhythmicity and that there is as yet no evidence for the permanent loss of multioscillator properties resulting from the destruction of only one of the two SCN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604987
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  • 10
    Electronic Resource
    Electronic Resource
    Water use, growth and rubber yields of four guayule selections as related to irrigation regimes (1984)
    Springer
    Irrigation science 5 (1984), S. 95-103 
    Details
    ISSN: 1432-1319
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary There has been renewed interest in cultivating guayule (Parthenium argentatum G.) for rubber production. Water use, growth and rubber yields of four guayule selections (593, 11.591, 11 646 and 4265 XF) were evaluated for two years in nonweighing field lysimeters at El Paso, TX. Four irrigation treatments were evaluated; these involved irrigation when about 40, 60 or 90% of available water was depleted, and the fourth treatment was irrigated at 60% depletion using saline water containing 3,300 mg of dissolved salts per liter. Water use for the two year period for these treatments amounted to 219, 147, 96 and 132 cm, respectively, plus biennial rainfall of 32 cm. Shrub and resin yields increased linearly with increasing irrigation, while rubber contents generally decreased with irrigation. Resultant rubber yields were highest under the lowest stress treatment, yielding about 840 kg/ha. Rubber yields with other treatments averaged 560 kg/ha with no significant yield differences among the tested selections. The salt treatment increased rubber contents of the shrubs, but caused reductions in shrub and rubber yields. Guayule plants survived well under low soil moisture, but water requirement to produce unit quantities of biomass was high (about 15 cm to produce one ton of dry shrub per ha). Guayule should not be regarded as a low water consuming crop if high yields per land area are to be achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272548
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