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  • 1
    Electronic Resource
    Electronic Resource
    A Mammalian Peptidase specific for the Hydrolysis of N -Terminal α- L -Glutamyl and Aspartyl Residues (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 867-867 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An enzyme having the characteristics noted here, aminopeptidase A, has been partially purified from rat kidney by the following method. The microsomal fraction derived from sucrose or potassium chloride homogenates of rat kidneys was resuspended in 0-001 M ^s(hydroxyamino)methane buffer at pH. 7-5. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194867a0
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  • 2
    Electronic Resource
    Electronic Resource
    The food and feeding relationships of black oreo, Allocyttus niger, smooth oreo, Pseudocyttus maculatus, and eight other fish species from the continental slope of the south-west Chatham Rise, New Zealand (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The food and feeding habits of black oreo and smooth oreo sampled at depths of 600–1200 m from the south-west Chatham Rise in 1983 are described, with notes on prey of eight other fish species. All these fish species fed benthopelagically. Black oreo preyed on hyperiid amphipods, salps and natant decapod crustaceans; smooth oreo on salps and amphipods. Dietary composition of both species changed with size of fish. Aspects of feeding relationships between the fish species were examined including dietary similarity and prey-size selection. Findings are compared with results of research on other New Zealand deepwater fish species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb02999.x
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  • 3
    Electronic Resource
    Electronic Resource
    Seasonal reproductive cycles in three commercially exploited fishes from the slope waters off New Zealand (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 30 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Reproductive cycles were investigated in orange roughy, Hoplostethus atlanticus, smooth oreo, Pseudocyttus maculatus, and black oreo dory, Allocyttus sp., from mid-slope waters (600–1300 m) around New Zealand from 1982 to 1985. Orange roughly displayed a mid-winter spawning period in July and August, whereas both dory species spawned in November and December. In all three species, the timing of spawning was consistent from year to year. Ovarian development in orange roughy and black oreo dory was found to be synchronous, with a single clutch of oocytes being matured for each spawning season. In males, testes of a given macroscopic stage were dominated by a single gamete stage, supporting the existence of a brief rather than prolonged spawning period. The possible relationship of spawning period to seasonal changes in the productivity of the surface water is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05745.x
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  • 4
    Electronic Resource
    Electronic Resource
    Osteoclast recruitment and modulation by calcium deficiency, fasting, and calcium supplementation in the rat (1994)
    Springer
    Calcified tissue international 54 (1994), S. 62-68 
    Details
    ISSN: 1432-0827
    Keywords: Osteoclast recruitment ; Osteoclast inhibition ; Fasting ; Calcium deficiency ; Histomorphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract In the rat, 1 week of a calcium-deficient diet will recruit large numbers of osteoclasts to long bone endosteal surfaces. Subsequent calcium supplementation causes the osteoclasts to disappear in 1–3 days but as little as 3 hours of calcium supplementation reduces the extent of their ruffled borders. To test the hypothesis that at some point there is an irreversible inhibition of osteoclasts, male, weanling, calcium-deficient, SD rats were given various amounts of calcium-containing diet followed by a 12-hour fast. No changes in seven morphological indices of osteoclast activity were found. The hypothesis that the fast had reversed the effects of the calcium diet was supported by a second experiment indicating that no inhibition threshold had been reached. Another experiment showed differences in the degree of osteoclast inhibition with different amounts of calcium supplementation, again without evidence of a threshold. These experiments raised two questions: (1) Will fasting recruit osteoclasts in calcium-replete rats? and (2) Is osteoclast recruitment facilitated by the presence of postosteoclasts? The results of experiments testing these hypotheses support the conclusion that fasting and calcium deficiency maintain plasma calcium levels by different mechanisms, and post-osteoclasts are not available for reactivation. It is concluded that inhibition of osteoclasts by dietary calcium is a graded phenomenon, and when osteoclasts have lost contact with the bone surface they are unavailable for reactivation; a threshold has been reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316292
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  • 5
    Electronic Resource
    Electronic Resource
    Enhancement of immunohistochemical staining (1982)
    Springer
    Histochemistry and cell biology 75 (1982), S. 203-208 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present paper describes two simple procedures which enhance immunohistochemical staining. One is to cover the sections with a plastic film to keep the serum uniformly distributed and minimize its evaporation. Secondly, rocking of the slides has been introduced, causing the serum to flow back and forth under the plastic film. Using this system, it has been possible to test for the effect of mixing on an immunohistochemical reaction (the demonstration of calcitonin in thyroid C cells). It has been found that mixing definitely enhances the reaction during the first 8 h. No effect of serum volume was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00496011
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  • 6
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    The rich are different: evidence from the RAVE survey for stellar radial migration (2015)
    Oxford University Press
    Details
    Publication Date: 2015-01-26
    Description: Using the RAdial Velocity Experiment fourth data release (RAVE DR4), and a new metallicity calibration that will be also taken into account in the future RAVE DR5, we investigate the existence and the properties of supersolar metallicity stars ([ M /H]  +0.1 dex) in the sample, and in particular in the solar neighbourhood. We find that RAVE is rich in supersolar metallicity stars, and that the local metallicity distribution function declines remarkably slowly up to +0.4 dex. Our results show that the kinematics and height distributions of the supersolar metallicity stars are identical to those of the [ M /H]  0 thin-disc giants that we presume were locally manufactured. The eccentricities of the supersolar metallicity stars indicate that half of them are on a roughly circular orbit ( e  ≤ 0.15), so under the assumption that the metallicity of the interstellar medium at a given radius never decreases with time, they must have increased their angular momenta by scattering at corotation resonances of spiral arms from regions far inside the solar annulus. The likelihood that a star will migrate radially does not seem to decrease significantly with increasing amplitude of vertical oscillations within range of oscillation amplitudes encountered in the disc.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 7
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    Torus mapper: a code for dynamical models of galaxies (2016)
    Oxford University Press
    Details
    Publication Date: 2016-01-01
    Description: We present a freely downloadable software package for modelling the dynamics of galaxies, which we call the Torus Mapper ( tm ). The package is based around ‘torus mapping’, which is a non-perturbative technique for creating orbital tori for specified values of the action integrals. Given an orbital torus and a star's position at a reference time, one can compute its position at any other time, no matter how remote. One can also compute the velocities with which the star will pass through any given point and the contribution it will make to the time-averaged density there. A system of angle-action coordinates for the given potential can be created by foliating phase space with orbital tori. Such a foliation is facilitated by the ability of tm to create tori by interpolating on a grid of tori. We summarize the advantages of using tm rather than a standard time-stepper to create orbits, and give segments of code that illustrate applications of tm in several contexts, including setting up initial conditions for an N -body simulation. We examine the precision of the orbital tori created by tm and the behaviour of the code when orbits become trapped by a resonance.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    Identification of globular cluster stars in RAVE data - I. Application to stellar parameter calibration (2015)
    Oxford University Press
    Details
    Publication Date: 2015-06-07
    Description: We present the identification of potential members of nearby Galactic globular clusters using radial velocities from the RAdial Velocity Experiment Data Release 4 (RAVE-DR4) survey data base. Our identifications are based on three globular clusters – NGC 3201, NGC 5139 ( Cen) and NGC 362 – all of which are shown to have |RV| 〉 100 km s –1 . The high radial velocity of cluster members compared to the bulk of surrounding disc stars enables us to identify members using their measured radial velocities, supplemented by proper motion information and location relative to the tidal radius of each cluster. The identification of globular cluster stars in RAVE DR4 data offers a unique opportunity to test the precision and accuracy of the stellar parameters determined with the currently available Stellar Parameter Pipelines used in the survey, as globular clusters are ideal test-beds for the validation of stellar atmospheric parameters, abundances, distances and ages. For both NGC 3201 and Cen, there is compelling evidence for numerous members (〉10) in the RAVE data base; in the case of NGC 362 the evidence is more ambiguous, and there may be significant foreground and/or background contamination in our kinematically selected sample. A comparison of the RAVE-derived stellar parameters and abundances with published values for each cluster and with BASTI isochrones for ages and metallicities from the literature reveals overall good agreement, with the exception of the apparent underestimation of surface gravities for giants, in particular for the most metal-poor stars. Moreover, if the selected members are part of the main body of each cluster our results would also suggest that the distances from Binney et al., where only isochrones more metal rich than –0.9 dex were used, are typically underestimated by ~40 per cent with respect to the published distances for the clusters, while the distances from Zwitter et al. show stars ranging from 1 to ~6.5 kpc – with indications of a trend towards higher distances at lower metallicities – for the three clusters analysed in this study.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Identification of globular cluster stars in RAVE data - I. Application to stellar parameter calibration (2015)
    Oxford University Press
    Details
    Publication Date: 2015-06-12
    Description: We present the identification of potential members of nearby Galactic globular clusters using radial velocities from the RAdial Velocity Experiment Data Release 4 (RAVE-DR4) survey data base. Our identifications are based on three globular clusters – NGC 3201, NGC 5139 ( Cen) and NGC 362 – all of which are shown to have |RV| 〉 100 km s –1 . The high radial velocity of cluster members compared to the bulk of surrounding disc stars enables us to identify members using their measured radial velocities, supplemented by proper motion information and location relative to the tidal radius of each cluster. The identification of globular cluster stars in RAVE DR4 data offers a unique opportunity to test the precision and accuracy of the stellar parameters determined with the currently available Stellar Parameter Pipelines used in the survey, as globular clusters are ideal test-beds for the validation of stellar atmospheric parameters, abundances, distances and ages. For both NGC 3201 and Cen, there is compelling evidence for numerous members (〉10) in the RAVE data base; in the case of NGC 362 the evidence is more ambiguous, and there may be significant foreground and/or background contamination in our kinematically selected sample. A comparison of the RAVE-derived stellar parameters and abundances with published values for each cluster and with BASTI isochrones for ages and metallicities from the literature reveals overall good agreement, with the exception of the apparent underestimation of surface gravities for giants, in particular for the most metal-poor stars. Moreover, if the selected members are part of the main body of each cluster our results would also suggest that the distances from Binney et al., where only isochrones more metal rich than –0.9 dex were used, are typically underestimated by ~40 per cent with respect to the published distances for the clusters, while the distances from Zwitter et al. show stars ranging from 1 to ~6.5 kpc – with indications of a trend towards higher distances at lower metallicities – for the three clusters analysed in this study.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 10
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    New distances to RAVE stars (2013)
    Oxford University Press
    Details
    Publication Date: 2013-12-06
    Description: Probability density functions (pdfs) are determined from new stellar parameters for the distance moduli of stars for which the RAdial Velocity Experiment (RAVE) has obtained spectra with S/N ≥ 10. Single-Gaussian fits to the pdf in distance modulus suffice for roughly half the stars, with most of the other half having satisfactory two-Gaussian representations. As expected, early-type stars rarely require more than one Gaussian. The expectation value of distance is larger than the distance implied by the expectation of distance modulus; the latter is itself larger than the distance implied by the expectation value of the parallax. Our parallaxes of Hipparcos stars agree well with the values measured by Hipparcos , so the expectation of parallax is the most reliable distance indicator. The latter are improved by taking extinction into account. The effective temperature–absolute magnitude diagram of our stars is significantly improved when these pdfs are used to make the diagram. We use the method of kinematic corrections devised by Schönrich, Binney and Asplund to check for systematic errors for general stars and confirm that the most reliable distance indicator is the expectation of parallax. For cool dwarfs and low-gravity giants, 〈〉 tends to be larger than the true distance by up to 30 per cent. The most satisfactory distances are for dwarfs hotter than 5500 K. We compare our distances to stars in 13 open clusters with cluster distances from the literature and find excellent agreement for the dwarfs and indications that we are overestimating distances to giants, especially in young clusters.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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