A revision of the Nearctic species of Clinohelea Kieffer (Diptera: Ceratopogonidae)

The seven species of Clinohelea known to inhabit North America are described and illustrated, and a key is provided for identification. Two species groups are recognized: the unimaculata group and the bimaculata group. Clinohelea longitheca and C. pseudonubifera are new. Clino - helea nebulosa (Malloch) is a synonym of C. curriei (Coquillett) NEW SYNONOMY.     

Range extension of the long-nosed snake, Rhinocheilus l. lecontei, into east-central Utah

A review of the distribution of Rhinocheilus l. lecontei, in Utah, with a northward extension of its range in the Upper Colorado River Basin.     

Winter macroinvertebrate communities in two montane Wyoming streams

Macroinvertebrate communities were examined on 4 winter dates over a 4-yr period in 2 high-altitude Rocky Mountain streams to document overwintering assemblages potentially experiencing spring acid pulses. Taxa richness values were comparable to other published lists for alpine and montane stream systems despite the fact that most literature reflected summer collections. Mean benthic density ranged from 1406 to 19,734 organisms/m 2 , and drift rates ranged from 0 to 1740 organisms/100 m 3 . Benthic collections showed higher taxa richness than drift collections while the Ephemeroptera and Plecoptera occurred in greater proportions in drift than in benthos. The Nemouridae (Plecoptera), Ephemerellidae and Heptageniidae (Ephemeroptera), Chironomidae (Diptera), and Hydracarina were the numerically dominant taxa in benthic collections. Grazer/scrapers and shredder/detritivores were always the numerically dominant functional feeding groups at all sites, composing 60-90% of the benthos. Predators, constituting approximately 15% of the community, occurred in the same relative proportion at all sites on all dates. Winter macroinvertebrate communities in these low-order, montane streams exhibit high taxonomic richness and benthic densities as great as lower-elevation mountain streams in the West.     

The structure determination of a novel C17 metabolite from streptomyces X-537 using Eu (DPM)3

Zusammenfassung Die Struktur destrans-6-[2-(1-hydroxybutyl)-4-tolyl]-hex-5-enamids (I), eines neuen mikrobiellen Metaboliten, wurde durch Protonenresonanz-Spektroskopie unter Verwendung des Verschiebungsreagenz Eu (DPM)₃ bestimmt.     

Preliminary observations of a bacteriophage infectingXenorhabdus luminescens (Enterobacteriaceae)

A bacteriophage infective toXenorhabdus luminescens, a bacterial symbiont of heterorhabditid nematodes, was recovered from insects that supported poor nematode development. Plaque tests showed the phage particles to be infective only to primary and not secondary colonies ofX. luminescens. The phage was not infective toX. nenatophilus primaries or secondaries. The bacteriophage particles ranged 80–90 nm in length, with the head ranging from 40 to 50 nm in diameter. Restriction analysis was performed on isolated bacteriophage DNA. This first report of a bacteriophage fromXenorhabdus species has pratical implications since it could be detrimental to cultures ofHeterorhabditis nematodes that are being produced throughout the world for the biological control of insects.     

Adenovirus type 12 infection of defined mouse-human hybrid cell clones

Summary Human adenovirus type 12 does not multiply in mouse cells; only viral T-antigen is detected. Mouse-human cell hybrid clones containing human chromosomes A3, B5, C7, C11, C12, D14, E17, F19 and F20, support synthesis of adenovirus DNA and capsid antigens.The hybrid clones used in these experiments were kindly supplied by Drs.Carlo Croce andHilary Koprowski of the Wistar Institute, Philadelphia, Pennsylvania. Supported by Grants from National Cancer Institute.     

The effects of cocaine in the production of cardiovascular anomalies inβ-Adrenoreceptor stimulated chick embryos

Summary Cocaine potentiates the effects of epinephrine and norepinephrine in terms of aortic arch malformation in embryonic chicks. Cocaine itself induces aortic arch malformations when administered in large doses.This study was supported by grant No. HL 18050, National Heart and Lung Institute, National Institutes of Health, Bethesda, Maryland.     

Bdelloid rotifers in Dominican amber: Evidence for parthenogenetic continuity

Recently discovered representatives of the Class Bdelloidea from Tertiary amber from the Dominican Republic represent the oldest known fossils of the Phylum Rotifera. Assuming that the fossil bdelloids had a similar mode of reproduction as present day members of the Class (apomictic thelytoky), then contrary to current thought, some lines of parthenogenetic organisms are not doomed to an early extinction and have evolved built-in mechanisms for genetic diversity.     

Additional studies on the effects of neonatal thymectomy and lactate dehydrogenase virus infection on mice

Zusammenfassung Die gegebenen Befunde lassen vermuten, dass neonatale Thymektomie und/oder Infektion mit LDH-Virus einen Effekt auf eine Anzahl von Faktoren wie LDH-Plasma-Spiegel, Gewichtserhöhung und Lebensdauer in Mäusen hervorrufen können. Der Virustiter im Plasma ist vom Zeitpunkt der Infektion abhängig.

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Supported by Public Health Service research grant No. 5 R01 CA05742-06 from the National Cancer Institute.