Konfiguration und pharmakologische Aktivität bei 1-phenäthylsubstituierten 1,2,3,4-Tetrahydroisochinolinen

Summary The absolute configuration of four pharmacologically active tetrahydroisoquinolines has been determined. It was shown that both the levorotatory antipodes of I, II and III and the dextrorotatory enantiomer of IV possessR-configuration at the asymmetric center.     

Dihydrobenzothiadiazine dioxides with potent diuretic effect

Zusammenfassung Die Gewinnung eines neuen, tierexperimentell und klinisch hochwirksamen Diureticums der Formel III (6-Chlor-7-sulfamyl-3,4-dihydro-1,2,4-benzothiadiazin-1,1-dioxyd) wird beschrieben.      

The occurrence of filamentous banded elements as components ofMytilus galloprovincialis byssus

Résumé L'examen au microscope électronique de sections ultra-minces de différentes portions du byssus deMytilus galloprovincialis a révélé pour la première fois la présence de structures filamenteuses périodiques (FBE). Leur période a une longueur de 1000 Å en moyenne, elle est symétrique et comporte deux fractions: A et B. Il est possible que ces structures correspondent à une organisation particulière de la protéine collagène.     

Triple cones found in retinas of 3 fish species

Summary Triple cones were found in the retinas of 3 species of fishes indigenous to the Woods Hole area. The function of these triple cones can not be deduced from the behavior patterns of these fishes.We wish to thank Kathleen French for her advice and criticism in the preparation of this paper.     

Effects of salicylate on water and electrolyte content of human red blood cells

Zusammenfassung Es wird gezeigt, dass Natriumsalicylatin vitro auf menschliche Erythrozyten einendirekten Einfluss ausübt, indem es den Kaliumgehalt vermindert und den Natriumsowie den Wassergehalt vermehrt. Diese Wirkung, die auchin vivo beobachtet werden kann, dürfte die Folge einer Energieverarmung sein, die durch eine Entkopplung der oxydativen Phosphorylierung zustande kommt.     

Enzyme localization in proteins separated by paper electrophoresis in human seminal plasma

Résumé Les transaminases -glutamo-oxaloacétique (GOT) et glutamo-pyruvique (GPT) ont été déterminées dans les protéines du liquide spermatique de l'homme après séparation par électrophorèse sur papier. L'amylase se trouve dans toutes les fractions, mais la GOT et la GPT sont localisées respectivement dans la globuline -2 et l'albumine.     

New Neotropical Haplothripini (Thysanoptera: Phlaeothripidae) with a key to Central and South American genera

The tribe Haplothripini includes a large diversity of Thysanoptera–Phlaeothripinae, comprising more than 550 species in about 35 genera. They are characterised by having a maxillary bridge in the head, prosternal basantra well developed and fore wings with a median constriction. Members of this group are present in all geographical regions, but are particularly poorly studied in Central and South America. In this study, we describe a new genus and species, Myrciathrips variabilis gen. et. sp. nov., and a new Haplothrips species; and propose two new combinations: Karnyothrips grassoi (De Santis), and Mirothrips vespicola (De Santis). A key to the nine Haplothripini genera now recognised from Central and South America is provided, together with an updated key to Haplothrips and Mirothrips species. A total of 45 species of Haplothripini are now recognised from Central and South America, and a list of these and their distributions is given. The genera Karnyothrips, Haplothrips and Leptothrips are the most commonly encountered, and some exotic species such as Androthrips ramachandrai and Dolichothrips indicus are now widespread in the Americas.     

Dominance relationships of the dark kangaroo mouse ( Microdipodops megacephalus ) and the little pocket mouse ( Perognathus longimembris ) in captivity

Interspecific interactions between the little pocket mouse ( Perognathus longimembris ) and the dark kangaroo mouse ( Microdipodops megacephalus ) were tested in the laboratory. P. longimembris was statistically dominant over M. megacephalus. The dominant - subordinate relationships shown by our laboratory results indicate that interspecific aggression may be one mechanism involved in keeping these sympatric species ecologically separated.       

Big sagebrush ( Artemisia tridentata vaseyana ) and longleaf snowberry ( Symphoricarpos oreophilus ) plant associations in northeastern Nevada

Artemisia tridentata/Symphoricarpos oreophilus and Symphoricarpos oreophilus/Artemisia tridentata  plant associations were studied in northeastern Nevada. A 60-stand reconnaissance followed by a detailed study of 37 stands differentiated five important habitat types using an association table approach. Data reduction with DECORANA and TWINSPAN also described five plant associations that were differentiated by species occurrence and geographical distribution. All stands were found at elevations between 2,200 and 3,100 m in areas where snow accumulates and is late to melt. Stands are found on 15 families of soils that are relatively deep, often skeletal, dark colored, and productive. The dominant perennial grasses included Agropyron spicatum, Agropyron trachycaulum, and Festuca idahoensis.     

Genetic variation and population structure in the cliff chipmunk, Eutamias dorsalis , in the Great Basin of western Utah

Allelic variation at 21 of 39 electrophoretically resolved enzyme loci was used to examine patterns of geographic differentiation and population structure in six allopatric samples of Eutamias dorsalis . Coefficients of genetic similarity for paired combinations of E. dorsalis samples ranged from 0.955 to 0.975, except for one population that was 0.900. Conservative genic divergence among five populations is proposed to be the result of relatively recent isolation events. High positive F 18 values and chi– square analyses confirm a significant excess of homozygotes at several loci at the five localities for which sample sizes were statistically adequate. This may be partly attributable to inbreeding, a Wahlund effect, linkage disequilibrium, posttranslational modification, or some combination of these; but at present some of these alternatives cannot be excluded in favor of a single explanation. Some samples were collected across altitudinal gradients of over 800 m, suggesting that a Wahlund effect may be the most likely explanation for low levels of heterozygosity in these populations.