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  • 1
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract An amperometric biosensor for the determination of phenol and chlorophenols using Trichosporon beigelii (cutaneum) has been developed. This sensor is more sensitive to chlorophenols, especially to mono- and dichlorinated phenols, than to phenol and is insensitive to benzoate. A linear relationship between the current range and the concentration of 4-chlorophenol is observed up to 40 μmol/l. The detection limit for all substrates studies is 2 μmol/l. the current difference is reproducible within 5.5% when the test solution contains 0.40 μmol 4-chlorophenol.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biology and fertility of soils 9 (1990), S. 91-92 
    ISSN: 1432-0789
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0016-6480
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 5 (1949), S. 162-162 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Numerous Noctuides and Geometrides show quite mistakable reactions upon sound stimulations ranging from 10,000 to 20,0000 vib/sec (Hertz). The lowest limit range of perception seems to lie at 40,000 up to 80,000 vib/sec. The reactions of sitting or walking animals are instant movements of flight or catalepsy. Flying animals try evasion or stop their flight at once. Sleeping animals can not be roused by sound stimulation. There are no sound reactions if both tympani are pierced. The Noctuides and Geometrides seem to perceive the supersonic echolocation cries of bats by aid of their tympanal organs.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 5 (1949), S. 218-220 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Since the first description of the halteres in Diptera byDerham (1711) six different theories have been formed about the function of these organs:—(1) equilibration, (2) steering, (3) sound production, (4) hearing, (5) smelling, (6) respiration. In 1916 and 1919, following v.Uexküll, v.Buddenbrock showed by careful considerations and experiments that the haltere problem is above all a problem of nerve physiology. Consequently the halteres are organs stimulating the production of potential nervous energy for wings and legs. This theory is the best explanation of the well-known experimental finding: after extirpation or fixation of the halteres many Diptera are unable to fly at all, or at least to fly well, and part of them are unable to run well. Fraenkel andPringle (1938) andMelin (1941) rejected the stimulation theory.Fraenkel andPringle think the halteres are gyroscopes, that is, organs of equilibrium, but without experimentally proving their theory.Melin agrees with v.Buddenbrock that the haltere problem is a problem of nervous physiology, but he denies the stimulative effect of the halteres.
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  • 7
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Carcinus maenas was filmed in normal active movement. When turning actively,carcinus maenas showed optomotoric reactions. The reactions were irregular when carcinus maenas was blinded or when the environment was homogeneous.
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Insect Physiology 14 (1968), S. 1477-1483 
    ISSN: 0022-1910
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 32 (1950), S. 468-481 
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung An zahlreichen Exemplaren von Noctuiden, Geometriden, Notodontiden und Arctiiden wurden Reaktionen auf Schallwellen des Frequenzbereiches 15–175 kHz beobachtet, die sämtlich Flucht- oder Totstellreaktionen waren und nach Häufigkeit und Intensität ihre niedrigste Schwelle im Bereich von 40–80 kHz haben. Die Reaktionen sind nicht artspezifisch. Durch Exstirpationsversuche konnte gezeigt werden, daß die Schallreize peripher in den Tympanalorganen aufgenommen, zentral kritisch verarbeitet werden und dann zu den beschriebenen Reaktionen führen. Diese sind also nicht reflektorisch entstanden, sondern müssen als Ausdruck echten Hörens aufgefaßt werden. Dieselben Reaktionen werden beobachtet, wenn Nachtfalter mit Fledermäusen konfrontiert werden, deren Orientierungslaute im selben Frequenzbereich liegen wie die niedrigsten Schwellen der Nachtfalter. Aus allem wird der Schluß gezogen, daß Nachtfalter Fledermäuse hören können, sich ihrem Zugriff durch Flucht oder Totstellen entziehen und dadurch einen relativen Schutz vor ihren Feinden besitzen.
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  • 10
    ISSN: 0044-2313
    Keywords: Tris(trimethylsilyl)methyl-derivatives, Lithium, Aluminium, Gallium, Indium ; spectra ; X-ray Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Base-free Tris(trimethylsilyl)methyl Derivatives of Lithium, Aluminium, Gallium, and IndiumBase-free LiR* (R*=-C(SiMe3)3) has been prepared from R*Cl and Li-metal in toluene at 85-90°C and used to synthesize the metallanes R*MMe2 with M = Al, Ga and In, respectively. The NMR (1H, 13C, 29Si) and the vibrational spectra of these trisyl compounds have been discussed.AlCl3 and LiR*(ratio 1 : 1) forms the metallate metallate Li[R*AlCl3]. The triclinic unit cell (space group P1) consists of a centrosymmetric assoziate, formed by four Li[R*AlCl3]- units with Al—Cl…Li bridges, two pairs of Li-atoms differing in their chlorine-coordination and two disordered toluene molecules, inserted in the crystal lattice (R1wR2 =0,0444/0,1072).The reaction of GaCl3 with LiR* (I :1) gives the unusual sesquichloride (R*Ga(Cl1,33)Me0,67)3 in moderate yield. The X-ray structure determination shows a Ga3Cl3-skeleton with chairconformation and disordered, terminal gallium ligands (R1/wR2= 0,0646/0,2270).
    Notes: Basefreies LiR* (R*=-C(SiMe3)3) wurde aus R*Cl und Lithiummetall in Toluol bei 85-90°C erhalten und zur Darstellung der Dimethylmetallane R*MMe2 mit M = Al, Ga, In verwendet, die durch NMR- (1H, 13C, 29Si) und Schwingungsspektren (Raman, IR) charakterisiert werden.AlCl3 und LiR* (Molverhältnis 1 : 1) bilden das Metallat Li[R*AlCl3]. Die trikline Einheitszelle (Raumgruppe P1) enthält ein zentrosymmetrisches, über Al—Cl … Li—Brücken gebildetes Assoziat aus vier Li[R*AlCl3]-Einheiten, mit zwei paarweise unterschiedlich von Chlor koordinierten Li-Atomen sowie zwei fehlgeordnete Toluolmoleküle (R1/ wR2 = 0,0444/0,1072).Die Reaktion von GaCl3 mit LiR* (1 : 1) in Toluol führt in mäßiger Ausbeute zum ungewöhnlichen Sesquichlorid (R*Ga(Cl1,33)Me0,67)3. Die Röntgenstrukturanalyse zeigt ein sesselförmig gewelltes Ga3Cl3-Sechsringgerüst und fehlgeordnete, terminale Liganden am Galliumatom (R1/ wR2 = 0,0646/0,2270).Li[R*AlCl3]. The triclinic unit cell (space group P1) consists of a centrosymmetric assoziate, formed by four Li[R*AlCl3]-units with Al-Cl … Li bridges, two pairs of Li-atoms differing in their chlorine-coordination and two disordered toluene molecules, inserted in the crystal lattice (R1/wR2 = 0,0444/0,1072).The reaction of GaCl3 with LiR* (1 : 1) gives the unusual sesquichloride (R*Ga(Cl1,33)Me0,67)3 in moderate yield. The X-ray structure determination shows a Ga3Cl3-skeleton with chairconformation and disordered, terminal gallium ligands (R1/wR2 = 0,0646/0,2270).
    Additional Material: 3 Ill.
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