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  • 1960-1964  (13)
  • 1955-1959  (23)
  • 1
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary In this work, we describe a new apparatus, destined to register the activity of small, or very small insects. We use an électrical photo cell. The traffic of insects, cut the very narrow light bundle, wich is focussed in the middle part of the electrical photo cell. The passage of insects gives impulses wich are magnified, counted, and finally inscribed on a paper sheet. The electrical photo cell is very sensitive in the red and infra-red. So, all visibles radiations are suppressed, and we use a very little brush of infra-red rays. The most important advantages of this apparatus are: to be very simple, and very easy to handle. We can study easily, the activity of the smallest insects (1 or 2 mm), and the activity of social insects. We can also study the action of climatory factors on the activity. The insects in experiments, wich are living in thier own nest, are never disturbed.
    Notes: Résumé Le présent travail a pour objet la description d'un nouveau type d'actographe destiné à l'enregistrement de l'activité de petits insectes. Nous utilisons un montage réalisé avec une cellule photo-électrique. Le passage d'un insecte interrompt le faisceau lumineux très étroit, centré sur la cellule. Il en résulte une impulsion qui est amplifiée, puis comptée, et inserited. La cellule est très sensible dans le rouge et l'infrarouge. On peut donc, sans inconvénients, arrêter toutes les radiations visibles, et travailler avec un fin pinceau de rayons infrarouges invisibles. Outre sa très grande sensibilité, et sa maniabilité, cet appareil se connecte très facilement à n'importe quel nid dont on désire étudier l'activité, sans que les insectes en expérience soient perturbés (puisqu'ils restent dans leur propre nid). Il permet d'étudier l'activité d'insectes isolés d'une longueur voisine de 1 à 2 mm, d'insectes sociaux, et de préciser l'action des facteurs du milieu sur l'activité.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 913-914 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the present work, superficial biopsies of the uterine cervix epithelium were removed from human uteri presenting a stage I or U carcinoma. In each case, a biopsy was also taken from nearby normal tissues of the same cervix. Each sample was homogenized in distilled water. An aliquot was treated ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 180 (1957), S. 1048-1049 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the present work, organs are withdrawn immediately after killing the animals (mice or rats). They are thoroughly washed and minced in iced physiological serum, then homogenized. An aliquot is withdrawn for determinations of ribonucleic acid, deoxyribonucleic acid and protein, while another is ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 258-259 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The mean survival-time of the experimental animals was determined in relation to the number of injected cells. Confirming the results obtained by Goldberg et aZ.2, the curve giving the relation between the number of cells injected and the mean survival-time shows three distinct parts. The first ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 176 (1955), S. 36-37 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The enzyme used in these experiments Was the commercial product produced by Armour from beef pancreas (the preparations used were sterilized by Seitz filtration). It has been mentioned elsewhere2 that this enzyme preparation differed in some respects from that described in the literature3*4 and ...
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 7 (1959), S. 0 
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: Conventional or continuous velocity logging generally fail to solve the problem of velocities in the whole area of a seismic survey. Surface measurements often bring a large amount of additional information: effect of shallow layers, change of facies, correlations. The authors present a theoretical view on the physical meaning of interval velocities. After a short synthesis of the diverse formulae formerly proposed (Faust, West), the practical manner of using these formulae and the accurate interpretation obtained with the help of geological and geophysical data are shown. Several characteristical examples are finally explained and commented on.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 8 (1960), S. 0 
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The practical use of synthetic records involves previous studies on field records from an original point of view; these studies consist essentially in analysing and cancelling noise, in bringing out the form of pulses and the character of seismic events, in detecting multiple arrivals. Various tools have been tested for this purpose: high multiplicity shooting, analysis of conventional well velocity surveys, mixing or selecting traces, varied filters; all these operations are facilitated by the use of magnetic recording.After several examples of these methods are given, it is shown how the results of such studies can help to make and discuss synthetic records with and without multiples. The share of multiple events and their effect on the efficiency of the later comparisons are especially treated.The authors finally present some specific examples of successful comparisons between synthetic records and field records treated beforehand. They insist on the discrepancies and on the importance of finding their origin, for the most tangible results in seismic interpretation generally appear during the analysis of such discrepancies.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 5 (1957), S. 0 
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The progress in the registration of refraction shots obtained in the last years permits a more systematic study of the secondary arrivals. In zones with disturbed tectonics, a noticeable portion of the received energy derives from diffraction phenomena caused by velocity anomalies in the marker bed or in the overburden (faults, local heterogeneities). Some characteristic examples are presented and schematically explained.A more advanced analysis of the branches of the travel time curve caused by diffraction leads, in favourable cases, to a new method of calculating the offsets and the vertical velocities, independent of the usual methods for the determination of these parameters.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 16 (1960), S. 149-149 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé La ribonucléase exerce une action inhibitrice sur le clivage des œufs d'oursins. La source commerciale de l'enzyme, la concentration utilisée et l'état des œufs déterminent les effets obtenus. Ceux-ci varient entre une inhibition totale immédiate et un ralentissement des divisions cellulaires, suivi d'un développement anormal éventuellement abortif. En outre, la ribonucléase a une action complexe sur la membrane de fertilisation, la couche hyaline et la membrane cellulaire. Cette dernière action pourrait être liée aux effets antimitotiques observés.
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  • 10
    Publication Date: 1960-04-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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