The body wall of Halicryptus spinulosus (Priapulida) — ultrastructure and changes induced by hydrogen sulfide

Halicryptus spinulosus (Priapulida) is extraordinarily resistant to hydrogen sulfide. As described previously, the body wall of specimens from oxic and from hydrogen sulfide-contaminated habitats differs strikingly in colour. In the present paper the ultrastructure of the body wall of specimens kept under oxic conditions is described. These findings serve as a reference for changes induced by exposure to hydrogen sulfide. There are marked ultrastructural differences between epidermal and muscular mitochondria exposed to hydrogen sulfide. Epidermal mitochondria of individuals subjected to hydrogen sulfide are often associated with dense granules of unknown composition. Findings are compared with those from other taxa which may encounter hydrogen sulfide in their environment.Contribution No. 386 of the Alfred-Wegener-Institut für Polar- and Meeresforschung (Awl Bremerhaven).     

Mitglieder-Versammlung 1970 im Haag

Ohne Zusammenfassung     

Die Wiederentdeckung der brasilianischen KolibrisAugastes scutatus undAugastes lumachellus

Zusammenfassung Seit vielen Jahrzehnten waren die KolibrisAugastes lumachellus undAugastes scutatus nicht wieder aufgefunden worden, bisA. Ruschi sie vor einigen Jahren wiederentdeckte. Verf. hat nunA. scutatus in gebirgigen Landschaften von Minas Gerais undA. lumachellus in der Serra Sincora (Bahia), einem vonRuschi ermittelten Fundort, aufgesucht. Beide Arten bewohnen mit niedriger xerophiler Vegetation bestandene felsige Berghänge in 1000–2000 m Höhe und sind dort häufig. Ihr Nest wird beschrieben.

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Summary A few years ags,A. Ruschi re-discovered the Brazilian Humming-birdsAugastes lumachellus andA. scutatus, which had not been traced for several decades. The present author visited the localities where they had previously been found. He came acrossA. scutatus at several places in the mountains of Minas Gerais andA. lumachellus in the Serra Sincora, Bahia. The habitat and the nest of both species are described.

     

Influence of sodium hydroxide on protein determination with the xylene brilliant cyanin G micromethod

The influence of sodium hydroxide on protein determination by two methods was investigated. Exposure of albumin to 0.1, 1.0, 5.0 and 9.0 m NaOH for up to 1 hr did not influence protein determination by a biuret method. In contrast to this, the presence of NaOH effected a pronounced reduction of the absorbances when a micromethod, involving adsorption of protein to cellulose filters followed by precipitation with TCA, was used.