Endophenotype of mysore (south india) population of the black rat (Rattus rattus L.)

Résumé Contribution à l'étude du polymorphism chromosomique chez le rat noirRattus rattus L.

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We are grateful to Prof.M. R. Rajasekarasetty for helpful suggestions and one of us (KLSP) to the University Grants Commission, New Delhi, India, for awarding a Research scholarship.     

Centric fusion in the malayan house rat,Rattus rattus diardii (Rodentia,Muridae)

Zusammenfassung Bei einem Männchen vonRattus rattus diardii aus Kuala Lumpur (Malaysia) wurden 41 Chromosomen (normal 2n = 42) gefunden, was mit der Robertson'schen Translokation in Zusammenhang stehen dürfte, welche die Fusion 2 einarmiger Autosomen in ein grosses, zweiarmiges Chromosom vollzieht.     

The karyotype of the black rat (Rattus rattus L.). Another population with a 38-chromosomes complement

Riassunto In una popolazione italiana diRattus rattus L. è stato messo in evidenza un cariotipo a 38 cromosomi; la differenza nel numero diploide rispetto a quanto noto per altre popolazioni della stessa specie è dovuta a due fusioni centriche in condizione omozigote. Il confronto con i cariotipi forniti da altri autori per la specieRattus rattus ci fa proporre anche per questa specie di Roditori la presenza di un fenomeno di polimorfismo cromosomico.     

Chromosomal identity of black rats (Rattus rattus) from the Galápagos Islands,Ecuador

Resumen Muestras de ratas negras (Rattus rattus) de siete islas del Archipiélago de Galápagos fueron examinadas para estudios de chromosomas. El número diploide de todos los animales es 38 y los cariotipos son idénticos a los de las poblaciones europeas, americanas, y australianas. La conclusión general es que la falta de variabilidad cariotípica de las poblaciones introducidas se explica por la capacidad de ratas de establecerse por medio de cambios fenotípicos.     

Oceanian type black rats (Rattus rattus) with a subtelocentric M2 chromosome and C-type transferrin obtained from North America

Résumé Dix rats (Rattus rattus) d'une colonie californienne ont été examinés. Cinq sont de type océanique. Les cinq autres ont 1 paire M₂ hétéromorphe, formée d'un métacentrique et d'un sub-métacentrique, ce qui implique une inversion péricentrique. Les transferrines sont du type océanique.     

New evidence of a 38-chromosomes karyotype in South American populations of the roof rat,Rattus Rattus L. (rodentia,muridae)

Resumen En dos poblaciones deRattus rattus, una de Mehuin (Valdivia, Chile) y otra de Capripe (Monagas, Venezuela), se encontró un cariotipo de 2n=38 cromosomas en todos los individuos estudiados. Este cariotipo corresponde al que presentan en forma monomórfica otras poblaciones de la rata negra de América del Sur y de Italia, y diffiere del cariotipo normal de la especie, que es de 42 cromosomas. Se postula que las distintas poblaciones sudamericans deRattus rattus deben haber invadido el Continente, acompañando al hombre, en distintas irrupciones, a partir de una forma de 38 cromosomas de origen mediterráneo.     

Experimential evidence for endogenously programmed differential migration in the blackcap (Sylvia atricapilla)

Female hand-raised blackcaps (Sylvia atricapilla) held in constant conditions (except for simulated seasonal changes in photoperiod) showed significantly more, and significantly longer, autumnal migratory activity as well as significantly later initiation of spring migratory activity than males from the same population (including siblings) held under identical conditions.This research was supported by the Alexander von Humboldt Foundation (Terrill) and the Deutsche Forschungsgemeinschaft (Berthold).     

Differences in the sensilla of African and American cercaria of Schistosoma mansoni, the agent of human intestinal bilharziasis]

Schistosoma mansoni parasite of the human intestinal bilharziasis is frequently transmitted in Africa by the Snail Biomphalaria pfeifferi and in America by Biomphalaria glabrata. The comparison between four African strains of cercariae obtained from Biomphalaria pfeifferi and five American strains from Biomphalaria glabrata points out variations in the number and arrangement of the sensory receptors.     

Chaetotaxic variation of the cercariae of Schistosoma mansoni, the agent of intestinal bilharziasis, correlation with the vertebrate host of the parasite]

The chaetotaxy of the cercariae of human or simian strains of Schistosoma mansoni, a fluke producing the intestinal bilharziasis displays a characteristic difference from that of cercariae of the same parasite adapted to Mouse or wild Rat. Taking into account this differential characteristic, makes it possible to determine the human or murine origin of cercariae released from naturally infected snails during epidemiologic investigations.     

Long-chain (Z)-9-alkenes are ‘Psychedelics’ to houseflies with regard to visually stimulated sex attraction and aggregation

Summary Three different tests on houseflies (Musca domestica L.) revealed that both pheromone-free pseudoflies and male partner flies exhibit in the presence of mixtures of long-chain (Z)-9-alkenes or pure (Z)-9-tricosene enhanced releasing effects for two optical cues, which stimulate male houseflies to mating strikes and houseflies of both sexes to aggregation.     

Long-chain (Z)-9-alkenes are "psychedelics" to houseflies with regard to visually stimulated sex attraction and aggregation.

Three different tests on houseflies (Musca domestica L.) revealed that both pheromone-free pseudoflies and male partner flies exhibit in the presence of mixtures of long-chain (Z)-9-alkenes or pure (Z)-9-tricosene enhanced releasing effects for two optical cues, which stimulate male houseflies to mating strikes and houseflies of both sexes to aggregation.     

Immunocytochemical evidence for the binding of insulin to the somatotrophic cells of the human hypophysis]

An immunocytochemical method has demonstrated a hypophyseal cell surface fixation of molecules exhibiting immunological properties of insulin. This fixation occurs massively on GH-cells and on a minority of ACTH cells of the human antehypophysis.     

Autoradiographic evidence for binding of 3H-flunitrazepam (Rohypnol) to melanin granules in the cat eye

This autoradiographic study revealed after an i.,v. injection an accumulation of 3H-flunitrazepam in melanin granules of the pigment epithelium and of the choroid cells. It seems that after a short period, a large proportion of the strongly bound drug is released.