Zur Biologie,Morphologie und Verhaltensweise von Apion virens Hrbst. (Col., Curculionidae)

Zusammenfassung Die vorliegende Arbeit soll einen Beitrag zur Monographie von Apion virens liefern. Von den einzelnen Stadien werden die Entwicklungsdauer sowie verschiedene morphologische Einzelheiten angegeben. Die Lebensdauer der Imagines beträgt 11–12 Monate, wobei die Käfer allerdings während der Überwinterung Nahrung aufnehmen müssen.Die Ausfärbung der Puppen und Imagines erfolgt progressiv. Der Fortgang dieser Prozesse wird im einzelnen beschrieben.Die Zahl der abgelegten Eier betrug maximal 166/.Untersuchungen zur Phänologie ergaben verschiedene gut abtrennbare Phasen im Laufe des Jahres.Im Wirtspflanzenspektrum der Art spielen Trifolium-Arten die wichtigste Rolle.Die Vorzugstemperatur- und-lichtbereiche zeigen charakteristische Veränderungen ihrer Lage im Laufe des Jahres. Dabei ergeben sich hinsichtlich der Temperatur auch Unterschiede zwischen und .Von den Verhaltensweisen der Imagines werden Kopulation, Eiablage und Putzhandlungen eingehend beschrieben.

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On the biology, morphology and behaviour of apion virens Hrbst. (Col., Curculionidae)

Summary This paper intends to give a contribution to a monography of Apion virens. From the different stages the duration of development and some details of the morphology are presented. The longevity of the adults reaches 11 to 12 months when uptake of food during hibernation is possible.The pigmentation of pupae and adults, which is described in detail, takes place progressively.The maximum number of eggs per female was 166.Investigations about the phenology showed several well separated phases in the course of one year. Trifolium species are the most suitable host plants of A. virens.The range of preference of temperature and humidity changes characteristically during the year. — Between and there exist also differences in the optimum temperature range.Copulation, egg-laying and cleaning behaviour are described in detail.

     

A comparative study of the chromosomes in the incipient species of the Drosophila paulistorum complex

Summary Drosophila paulistorum Dobzhansky et Pavan is a complex of six races or incipient species. The races are mostly allopatric, but they are reproductively isolated sufficiently to permit them to exist also sympatrically in some places. The gene arrangements in the chromosomes of the races have been compared by means of examination of the giant chromosomes in the larval salivary glands; 28 strains of all races, and about an equal number of interracial hybrids have been studied.Chromosomal inversion polymorphism has been discovered in all races, even in the Guianan race of which only a single strain is available. Inversion heterozygotes are found in every one of the five chromosomal strands which the species has. Interracial hybrids tend to be heterozygous for more inversions than are present in the strains of the parental races. The Transitional race has however much the same gene arrangements as the widespread Andean — South Brazilian race.With the exception of the Transitional race, and of three other possible exceptions, each race has a collection of its own race-specific inversion polymorphs, not found in the other races. This very striking finding is discussed in connection with the hypothesis which envisages the origin of new species from marginal colonies at the periphery of the geographic distribution area of the ancestral species.The work reported in this article has been carried under Contract No. AT-(30-1)-1151, U.S. Atomic Energy Commission, mostly at the Department of Zoology, Columbia University, New York.     

Ein Beitrag zur Kenntnis des Selektivitätsmechanismus von Pyrazon

Ve snaze identifikovat fyziologické pochody rozhodující o selektivní toxicitě pyrazonu (1-fenyl-4-amino-5-chorpyridazon-6) jsme sledovali jeho vliv na hlavní enzymové systémy ?ídící dýchání ko?en?. Zatímco jsme u ko?en? zeSinapis alba zjistili úplnou inaktivaci dehydrogenázy kyseliny jantarové—u ko?en? cukrovky je stejný enzym stimulován.     

Die Herstellung von neuen Allopolyploiden für die Züchtung

Ohne ZusammenfassungQuedlinburger Beiträge zur Züchtungsforschung Nr. 65Herrn Prof. Dr. Dr. h. c.Becker zum 60. Geburtstag.     

Fluctuations in human serum lipoproteins during the normal menstrual cycle

1. Lipoproteins were measured in sera from 11 young women having a similar environment and diet. Sera were obtained at weekly intervals over a 12-week period. The values of the lipoproteins during periods in the normal ovulatory cycle were compared to assess their relation to reported hormone concentrations in blood. 2. Only the 4–0s_f (HDL₂) (d 1·125 sodium chloride) fraction changed significantly; it increased at ovulation in ten of the 11 subjects and fell as menstruation approached. 3. There was greater variability in most of the low-density rather than the high-density lipoproteins within individuals. The lipoprotein class most characteristic for an individual was the 4–0s_f or HDL₂ fraction.