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  • 1980-1984  (1)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Localization of pheromone excretion in the female of Trogoderma granarium (Dermestidae) (1970)
    Springer
    Entomologia experimentalis et applicata 13 (1970), S. 342-351 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La localisation de la glande productrice de phéromone chez la femelle de Trogoderma granarium a été recherchée selon deux méthodes: a) recherche du lieu de l'excrétion par l'emploi de tests basés sur le comportement d'attraction; b) examen histologique de la région suspectée, d'après les résultats précédents. Nous avons conclu d'après les résultats obtenus dans une série de tests d'attractivité que: 1) les œufs de T. granarium sont porteurs d'une odeur attractive; 2) cette odeur ne provient pas de l'ovipositeur; 3) on peut localiser le lieu de production de cette odeur au dernier segment abdominal visible extérieurement. Ce point a été démontré en recouvrant l'extrémité de l'abdomen des femelles d'un vernis dilué (lui-même non-attractif pour les insectes) qui empêche l'excrétion de la phéromone; 4) l'intensité de l'excrétion de la phéromone varie avec l'âge des insectes. Une étude histologique de l'abdomen de la femelle révèle que l'épithélium du repli intersegmentaire ventral compris entre le 5ème et le 6ème sternite abdominal est formé de hautes cellules cylindriques, avec un noyau relativement grand et un cytoplasme granuleux. Ce dernier apparaît réduit et contracté chez les insectes plus âgés. Les données histologiques suggèrent que ce repli intersegmentaire fait office d'une glande multicellulaire sécrétrice de la phéromone. Cette conclusion est en accord avec les résultats obtenus au cours des tests d'attraction.
    Notes: Abstract An investigation on localization of the pheromone-producing gland in female Trogoderma granarium was accomplished using two methods: a) search for site of excretion by use of behavioural attraction tests, and b) histological investigation of the “suspect area” found in a). From the results obtained in a series of attraction tests we concluded that: 1) The eggs of T. granarium bear the attractive odour; 2) This odour is not excreted from the ovipositor; 3) The site of excretion could be related to the last externally visible abdominal segment. This was shown by covering the tip of the abdomen of females with diluted laquer (itself not attractive for the beetles) which prevented excretion of the pheromone; 4) The intensity of pheromone excretion differed in beetles of various ages. A histological study of the female abdomen revealed that the epithelium of the ventral intersegmental fold between the 5th. and 6th. abdominal sternites is composed of thick columnar cells with relatively large nuclei and a granulated cytoplasm. The latter appeared shrunken and atrophied in older beetles. The histological data suggest that the above intersegmental fold serves as a multicellular gland excreting the pheromone. This conclusion is in agreement with the data obtained from attraction tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334320
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of scorpion venom on the moulting activity of larvae of the beetle Trogoderma granarium (1971)
    Springer
    Entomologia experimentalis et applicata 14 (1971), S. 175-178 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'injection à des larves en diapause de Trogoderma granarium, de doses subléthales du venin du scorpion Leiurus quinquestriatus, a pour conséquence l'apparition de mues larvaires supplémentaires. Quand des larves sont soumises à des conditions mettant fin à la diapause (aboutissant normalement à la nymphose), par transfert dans des tubes contenant de la nourriture fraîche, l'injection de venin réduit fortement le nombre de mues nymphales et accroît celui des mues. larvaires.
    Notes: Abstract Injection of sublethal doses of venom from the scorpion Leiurus quinquestriatus H. et E. into starved diapausing larvae of Trogoderma granarium results in additional larval moults. When the injected larvae were subjected to diapause-terminating conditions (leading to pupation) by transfer to test tubes containing fresh food, the injection of venom sharply decreased the number of pupal moults and increased the number of larval moults.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292998
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The cytotoxicity of a cobra venom phospholipase to mouse lymphoma cells (1982)
    Springer
    Archives of toxicology 51 (1982), S. 167-173 
    Details
    ISSN: 1432-0738
    Keywords: Cobra venom ; Phospholipase A2 ; Mouse lymphoma ; Cytotoxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A series of phospholipases were compared as to their ability to disrupt variants of S-49 mouse lymphoma cells. The basic, type-A2-phospholipase (named P3-Menashe et al. 1980) derived from the venom of the cobra snake Naja mossambica mossambica has demonstrated unique cytolytic properties in the following aspects: (1) While being devoid of any direct hemolytic activity and demonstrating very low cytotoxicity to normal mouse lymphocytes, P3 has induced a potent lytic action on S-49 cells and several mutants derived from them. (2) When P3 was compared to a cytolytic cardiotoxin derived from the same venom it was found to possess higher cytotoxicity. (3) The ability of P3 to disrupt S-49 cells could not be reproduced by lysophosphatidylcholine — a common and strongly hemolytic product of phospholipase A2 enzymatic action. (4) The possible relation between the high susceptibility of lymphoma cells to the lytic action of P3 and their unique composition and/or arrangement of membranal phospholipids is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302757
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    Paper (German National Licenses)
    Fulltext
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