ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 14 (1967), S. 131-155 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Influence of temperature on the activity ofAphænogaster senilis workers is experimentally studied. Only the inner temperature of the nest is important. Temperature of external environment, acts essentially on the speed, and very little on the number of foraging ants (except for sub-lethal temperatures). These results are valid for daily as well as for annual variations of temperature.
    Notes: Résumé L'influence de la température sur l'activité des ouvrièresAphænogaster senilis est étudiée expérimentalement au laboratoire. C'est la température interne du nid qui joue le rôle fondamental. La température externe, agissant essentiellement sur la vitesse de déplacement, ne joue un rôle inhibiteur prédominant que pour les valeurs extrêmes (températures sub-léthales). Ces résultats sont valables aussi bien pour les variations journalières que pour les variations annuelles de température.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 4 (1966), S. 293-352 
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 1241-1243 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The results reported here concern DNA-3H, prepared by the method of Marmur7, from Bacillus subtilis grown on deuterium oxide in the presence of thymidine-3H, by the method of Bodner and Schildkraut8. In agreement with previous reports the DNA we obtained has a buoyant density of 1.728 g/ml. The ...
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 397-398 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have studied the role of exogenous DNA in various development stages of older plants. The exogenous DNA (2 x 106 d.p.m./(jLg) was extracted3 from a thymine-free strain of Escherichia coli (CR 34), cultured on a medium containing 3H-thymine. We chose the tomato (Ly coper-sicon esculentum, var. ...
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 1256-1259 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Groups of thirty barley seeds were incubated for 1 h in water, peeled with forceps and sterilized with 3-5 per cent NaOCl for 30 min10. After being washed several times with sterile distilled water, the seeds were grown in water for 11 h. Each seed was then partially sectioned5 and placed on a ...
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We used the tomato variety 'Tuckwood' treated in the following way. Apical shoots (5-9 cm) of adult plants with young leaves and without roots were dipped into a solution of Escherichia coli or Bacillus subtilis tritiated DNA for 6 h. They were then transferred to water for 48 h. The region dipped ...
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    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.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    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.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...