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  • Springer  (175)
  • 2005-2009  (93)
  • 1980-1984  (69)
  • 1935-1939  (13)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of wildlife research 26 (1980), S. 1-11 
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary At 3-weekly intervals over a period of 13 months, blood samples were taken from the jugular vein of 8 male and 8 female roe deer kept in research enclosures, so that the total of thyroxin (T4 D), T3 U and ureal nitrogen could be established. Once a week the level of activity of the metatarsal glands was recorded by observation. The thyroid gland hormone levels were not dependent upon sex but were higher in the second and third years than in calves (9–17 months). Seasonal differences were observed in the form of higher proportions of T4 in winter, April/May and July. The index free thyroid gland hormone showed no significant seasonal alterations. There is no obvious daily rhythm. No clear relationship between thyroxin content in the blood and activity of the metatarsal glands was discovered. Two-fold high doses of thyroxin did not stimulate production of pheromon noticeably. The level of urea in the blood is somewhat higher in young roe deer than in adults. The level falls in winter and reaches a maximum in summer after the rut. The urea content of blood is inversely correlated to the concentration of thyroxin — it falls as the thyroxin content of the blood rises.
    Abstract: Resumé Afin de déterminer le taux de Thyroxine totale (T4 D), de T3 U et d'Urée, des prélèvements sanguins ont été exécutés, de trois en trois semaines et pendant une période de 12 mois, au niveau de la veine jugulaire de 8 chevreuils mâles et de 8 chevreuils femelles maintenus en enclos. Chaque semaine, le stade d'activité des glandes métatarsales fut noté. La teneur du sang en hormone thyroîdienne était indépendante du sexe de l'animal et était plus élevée du cours de la 2éme et de la 3éme années que chez les chevrillards (9 à 17 mois). Des variations saisonnières de la teneur en T4 dans le sang se manisfestèrent sous forme de pics en hiver, en avril-mai et en juillet. L'indice de l'hormone libre de la glande thyroîde ne présenta aucune variation saisonnière significative. Un rythme quotidien caractérisé n'existe pas. Une relation claire entre la teneur de Thyroxine dans le sang et l'activité des glandes métatarsales n'est pas apparue. La double injection de doses élevées de Thyroxine n'a pas stimulé sensiblement la production de phéromones. Le taux d'Urée sanguine est plus élevé chez les jeunes chevreuils que chez les sujets adultes; on observe en outre une chute au cours de l'hiver et des pointes au cours de l'été aprés le rut. La corrélation entre les taux d'Urée et la concentration de Thyroxine est négative.
    Notes: Zusammenfassung Von 8 männlichen und 8 weiblichen im Versuchsgehege gehaltenen Rehen wurden in 3wöchigem Abstand über einen Zeitraum von 12 Monaten Blutproben aus der Vena jugularis entnommen und damit das Gesamtthyroxin (T4D), das T3U und der Harnstoffstickstoff bestimmt. Wöchentlich einmal wurde durch Beobachtung der Aktivitätsstatus der Metatarsaldrüsen festgehalten. Der Schilddrüsenhormonspiegel war geschlechtsunabhängig, er war im zweiten und dritten Lebensjahr höher als bei den Kitzen (9–17 Monate). Jahreszeitliche Schwankungen wurden bei T4-Blutspiegeln in Form von erhöhten Werten im Winter, April/Mai und Juli beobachtet. Der Index des freien Schilddrüsenhormons wies keine signifikanten saisonalen Veränderungen auf. Eine deutliche Tagesrhythmik besteht nicht. Ein deutlicher Zusammenhang zwischen Thyroxinblutspiegel und Metatarsaldrüsenaktivität war nicht gegeben. Zweimalige hohe Gaben von Thyroxin regten die Pheromonproduktion nicht merklich an. Der Harnstoffblutspiegel ist bei jungen Rehen etwas höher als bei erwachsenen Rehen, er fällt im Winter ab und weist Spitzenwerte im Sommer nach der Brunft auf. Der Harnstoffblutspiegel korreliert mit der Thyroxinkonzentration invers, er fällt mit steigendem Thyroxinblutspiegel.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 47 (1939), S. 186-194 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 260 (1982), S. 458-458 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 14 (1984), S. 425-436 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A theoretical analysis of the membrane current distribution is carried out for a typical three-compartment electrolyser in order to point out the effects of geometry on the design of mesh anodes. The factors considered here include the introduction of an insulated border, the perforation of the anode, the finite conductivity of the substrate, and the introduction of a bus bar connection between the anode and the current lead. It is recommended that no insulated border be introduced, since, while reducing the anode area and consequently its cost, it leads to a nonuniform membrane current distribution and hence decreases membrane efficiency. Also, titanium is found to be a suitable substrate for the anode in spite of its relatively low conductivity.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 40 (1984), S. 579-581 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The immunological and structural changes during the heterologous phase of experimental antibasement membrane antibody mediated disease was sequentially studied in the rat following single i.v. injections of rabbit antibodies to basement membrane antigens prepared from kidney, lung and salivary gland tissues. Although each of the anti-bodies bound strongly to GBM, structural changes were initially subtle accompanied by proteinuria and hematuria. More severe structural changes related to dose and duration of the disease did not appear for several weeks.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 35 (1984), S. 21-26 
    ISSN: 1570-7458
    Keywords: Aleyrodidae ; esterase ; Homoptera ; insecticide resistance ; parthenogenesis ; resmethrin ; sex ratio ; synergism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La lutte chimique contre Trialeurodes vaporarium Westwood est possible mais difficile (Kraemer, 1966; Watve et al., 1976) par suite de l'augmentation de la résistance (Wardlow et al., 1972, 1975, 1976). Une population ayant subi des traitements à différent insecticides pendant les précédentes années a été choisie. 13 générations successives ont été exposées aux doses de malathion nécessaires pour provoquer une mortalité de 80 à 90%. La sensibilité de chaque génération a été testée sur des adultes de 3–4 jour, placés sur feuilles de Phaseolus vulgaris. La DL50 a été calculée par la méthode de Finney (1971). En 13 générations, la sélection a accuru la LC50 au malathion de 55 fois. La résistance à la resméthrine a augmenté de 1,7 fois; mais il n'y a pas eu apparition de résistance au dichlorvos, au méthomyl ou à la perméthrine. DEF (S,S,S,-tributyl phosphorotrithioate) augmente la toxicité du malathion de 18,6 fois et celle de la resméthrine de 3,4 fois. Ceci impliquerait les estérases dans la résistance des aleurodes au malathion. Pendant la sélection, le taux sexuel de la lignée résistante est favorable aux femelles. La parthénogenèse, la rapidité du cycle, la polyphagie et la mobilité accélèrent le processus de résistance aux insecticides chez les aleurodes.
    Notes: Abstract A strain of the greenhouse whitefly (Trialeurodes vaporariorum Westwood (Homoptera: Aleyrodidae)) with a history of insecticide exposure was selected with malathion sufficient to cause 80–90% mortality. After 13 generations, malathion resistance had increased 55-fold, and a slight (1.7 ×) increase in resmethrin resistance was noted. There was no cross-resistance to dichlorvos, methomyl or permethrin. DEF (S,S,S-tributyl phosphorotrithioate) synergized malathion (18.6 ×) and resmethrin (3.4 ×). This suggested involvement of esterases in resistance of whiteflies to insecticides. Throughout selection, the resistant strain showed a high proportion of females. Virgin females of both resistant and parent strains produced males only.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 47 (1939), S. 359-379 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 208-211 
    ISSN: 1570-7458
    Keywords: Dieretiella rapae ; Encyrtidae ; Insecticide ; Integrated control ; Hymenoptera ; Pteromalidae ; searching behavior ; Syrphidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 75 (1981), S. 79-91 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die KAPA-Technik ist ein mikroanalytisches System für die biochemische und insbesondere enzymatische Analyse in Forschung, klinischer Chemie und Toxikologie. Es werden Testvolumina zwischen 5 und 80μl benutzt. Der Reagenzienverbrauch ist auf 0,5–5% gegenüber herkömmlichen Techniken gesenkt. 50 Tests werden parallel ausgeführt. Der Probendurchsatz liegt zwischen 300/Stunde und 500/Tag. Drei Versionen der Technik stehen zur Verfügung: 1. Schwellentests erfordern ein Minimum an Ausrüstung und liefern semiquantitative Ergebnisse. Sie sind den Bedingungen großer Reihenuntersuchungen und ja/nein-Entscheidungen angepaßt. 2. Für quantitative Papiertests kann ein relativ einfaches Meßgerät benutzt werden. Die analytische Qualität entspricht üblichen Empfehlungen für die klinische Chemie. 3. Multiküvettentests werden in einem Meßgerät größerer technischer Komplexität durchgeführt. Sie ermöglichen kinetische Bestimmungen und sind in weitem Rahmen für die Lösung vielfältiger analytischer Aufgaben mit kolorimetrischer, polarimetrischer, nephelometrischer und fluorimetrischer Auswertung einsetzbar. Diese wird in allen drei Versionen bevorzugt. Die Geräteausrüstung umfaßt Reaktionskammern, ein spezielles Meßgerät, Hohlkolbenpipette, vollmechanisierte 50fach-Multipipette und verschiedene Zusatzgeräte.
    Notes: Summary The KAPA technique is a mechanized microanalytical system for biochemical analysis, particularly adapted to enzymatic analysis in research, clinical chemistry and toxicology. Total test volumes are between 5 and 80μl. The reagent waste is reduced to about 0.5–5% of that with conventional tests. Fifty assays are carried out in parallel. The efficiency is between 300 assays/hour and 500/day. There are three versions of the technique. (1) Threshold tests requiring a minimum of equipment and delivering semiquantitative results; they are suitable for large scale screening and yes/no decisions. (2) Quantitative paper tests using a relatively simple measuring device and giving an analytical quality acceptable for clinical chemistry. (3) Multicuvette tests using a measuring instrument of higher sophistication, and suitable for kinetic determinations; they open a wide field of application, including colorimetric, polarimetric, nephelometric and fluorimetric evaluation, the last being the preferred evaluation mode for all three versions. The instrumental equipment comprises reaction chambers, a special measuring device, dispenser pipette, fully mechanized 50-fold multipipette and various accessories.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 113 (1982), S. 565-572 
    ISSN: 1434-4475
    Keywords: Formaldehyde generating reagent ; Solvent shifts in1H-nmr ; Spiranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mono and dispiro-1,3-dioxanes (1–3) were synthesized by the condensation of 1,2-, 1,3- and 1,4-cyclohexanedione, respectively (4–6) with bis-(hydroxymethyl)-malonic ester (7). The1H-NMR spectra prove for the mono- (2) and dispiro-1,3-dioxane (3) the existence of conformational equilibria and for the monospiro-1,3-dioxane (1) a “fixed” structure. C6D6 causes a remarkable solvent shift effect in the NMR spectra separating a superposed complex coupling pattern (in CDCl3) in two well resolved AB doublets and two AX quartets. TheE-oxime of the monospiro-1,3-dioxanone (1) represents also a “fixed” structure. Bis-(hydroxymethyl)-malonic ester (7) is a formaldehyde generating agent in the condensation reaction of dimedone with the diol7.
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