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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 370 (1969), S. 275-282 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cleavage of R2NSi(CH3)3 (R = CH3, C2H5) by TiBr4 yields R2NTiBr3. The compounds (R2N)2TiBr2 and (R2N3)TiBr were obtained by metathesis from TiBr4 and Ti(NR2)4. Properties, 1H-NMR and far-infrared spectra of all dimethylamino- and diethyl-amino titanium bromides are reported. Only the R2NTiBr3 derivatives associate frorming TiBrTi bridges.
    Notes: Die Spaltung von R2NSi(CH3)3 (R = CH3, C2H5) mit TiBr4 eignet sich zur Darstellung von R2NTiBr3, während (R2N)2TiBr2 und (R2N)3TiBr in guten Ausbeuten aus TiBr4 und Ti(NR2)4 erhalten wurden. Eigenschaften, 1H-KMR- und IR-Spektren 〈 700 cm-1 aller Dimethylamino- und Diäthylamino-titanbromide werden beschrieben. Stärkere Assoziation über TiBrTi-Brücken tritt nur bei den R2NTiBr3-Verbindungen auf.
    Additional Material: 4 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of plant growth regulation 13 (1994), S. 167-171 
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The recently arrived Russian wheat aphid (RWA) is a major pest of wheat and barley in the United States. RWA induced ethylene production in Morex, a barley variety susceptible to RWA, but induced little ethylene production in PI 366450, a barley resistant to RWA. Greenbugs, another aphid pest, induced ethylene production in PI 366450 and Morex, both of which are susceptible to greenbugs. RWA infestation results in pronounced symptoms on barley including leaf streaking, stunting of growth, and rolled leaves. Incubation of barley in ethylene (5 and 50 μl/l) or other plant hormones (auxin, gibberellic acid, zeatin, kinetin, and abscisic acid at 10-4 M) failed to produce streaking or rolling in uninfested plants or to alter the production of these symptoms in infested plants. Incubation of Morex and PI 366450 in ethylene caused some stunting of the leaves and internodes that emerged during or soon after ethylene incubation. However, the leaf and internode that emerged 9 days after incubation showed some compensatory, or increased, growth.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 95 (2000), S. 269-281 
    ISSN: 1570-7458
    Keywords: green peach aphid ; cuticular hydrocarbons ; Myzus nicotianae ; Myzus persicae ; RAPD-PCR ; tobacco ; tobacco aphid ; Homoptera ; Aphididae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Prior to designation as distinct species, an appellation presently in question, the tobacco aphid, Myzus nicotianae Blackman (Homoptera: Aphididae), was classified as a tobacco-feeding form of the green peach aphid, Myzus persicae (Sulzer). In this study, RAPD polymorphisms distinguished members of the Myzus persicae complex (M. persicae and M. nicotianae) from three outgroup Myzus species (M. cerasi (F.), M. hemerocallis Takahashi, and M. varians Davidson). Polymorphisms within the complex did not separate populations on the basis of host association (tobacco versus other host plants) or geographic origin (collections from the United States, Europe, and Japan). Similarly, while GC-MS analysis of cuticular hydrocarbon profiles revealed both developmental and inter-populational differences within the M. persicae complex, it did not separate populations of tobacco feeding aphids from those collected off non-tobacco hosts. Finally, with the exception of their responses to a choice between lettuce and collards, the host preference behavior of a green peach aphid population, a red tobacco aphid population, and a green tobacco aphid population was indistinguishable in host preference experiments. These results add to a growing body of evidence suggesting M. nicotianae and M. persicae are conspecific.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Community mental health journal 32 (1996), S. 463-480 
    ISSN: 1573-2789
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This paper reviews issues in planning and delivering mental health services to rural dwelling elderly. First, comparative data on the prevalence of mental illness among rural elderly, and the availability and accessibility of mental health services in rural areas are presented to provide a basis for subsequent discussion. Next, several strategies for improving the development and delivery of geriatric mental health services to rural areas are discussed. These include: increasing the number and quality of rural mental health providers; adapting or developing diagnostic techniques to improve case identification among rural elderly; providing culturally sensitive mental health services; strengthening informal and formal care linkages in rural communities; developing innovative service delivery models building upon the strengths of rural settings; and emphasizing fluidity as well as continuity in treatment models.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of abnormal child psychology 24 (1996), S. 105-119 
    ISSN: 1573-2835
    Source: Springer Online Journal Archives 1860-2000
    Topics: Psychology
    Notes: Abstract This study investigated the short-term stability of teacher-rated aggression, peer-rated rejection, and peer-rated depressive symptoms in 478 elementary school children from 25 classrooms (first to third grades) in two geographical areas. Children who presented specific combinations of aggression, rejection, and depressive symptoms were tracked to determine the stability of these combinations from the beginning (Time 1) to the end (Time 2) of the school year. In addition, aggression, rejection, and depressive symptoms were treated as risk factors, and children were classified as displaying zero, one, two, or three risk factors at Times 1 and 2. Of the three risk factors, aggression appeared to be the most stable. Three-quarters of children who presented aggression at Time 1 (either alone or in combination with the other risk factors) were found to continue to have elevated levels of aggression at Time 2. Although specific combinations of aggression, rejection, and depressive symptoms were not very stable over time, the number of risk factors a child displayed at Time 1 was a good predictor of the number of risk factors the child displayed at Time 2. Stability of risk factors was comparable as a function of child gender and ethnicity.
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 97 (1975), S. 4922-4925 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 365 (1969), S. 243-254 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cleavage of trimethylsilyl amines Me3SiNRR′ by TiCl4 yields dialkylaminotitanium compounds RR′NTiCl3 (R, R′ = CH3, C2H5, iso-C3H7). According to their properties and their far infrared spectra these compounds are halogen-bridged oligomers which react with an excess of Me3SiNRR′ to products of the formula (RR′N)≤1.8TiCl≥2.2. If R is C6H5, the aminotitanium derivatives have only the approximate composition RR′NTiCl3. From the reaction of TiCl4 with Me3SiNHC6H5 only TiCl4 · 2 C6H5NH2 could be obtained.
    Notes: Die Spaltung von Trimethylsilyl-diorganylaminen Me3SiNRR′ mit TiCl4 eignet sich zur Darstellung von Dialkylamino-titanchloriden RR′NTiCl3 (R, R′ = CH3, C2H5, iso-C3H7). Diese Verbindungen sind, wie aus ihren vollständigen IR-Spektren hervorgeht, über Cl-Atome zu Oligomeren verbrückt. Mit überschüssigem Me3SiNRR′ schreitet die Substitution des TiCl4 nur bis zur Grenzformel (RR′N)≤1,8TiCl≥2,2 fort. Ist R = C6H5, so besitzen die Reaktions-produkte nur angenähert die Zusammensetzung RR′NTiCl3. Die Reaktion von Me3SiNHC6H5 mit TiCl4 ergibt als einziges einheitliches Produkt TiCl4 · 2 C6H5NH2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 381 (1971), S. 198-204 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The compounds (Me2N)3TiI, (Me2N)2TiI2, (Et2N)3TiI, and (Et2N)2TiI2 were prepared for the first time by reaction of TiI4 with (R2N)4Ti; the triiodides R2NTiI3 could not be isolated. All compounds were investigated by NMR and Ear Infrared spectroscopy. Their properties resemble those of the corresponding bromides previously described.
    Notes: Durch Reaktion von TiJ4 mit Ti(NR2)4 wurden die Verbindungen (Me2N)3TiJ, (Me2N)2TiJ2, (Et2N)3TiJ und (Et2N)2TiJ2, dargestellt; Trijodide R2NTiJ3 ließen sich nicht in reiner Form isolieren. Die neuen Verbindungen wurden durch Protonenresonanz- und Spektren im fernen Infrarot charakterisiert. In ihren Eigenschaften schließen sie sich an die bereits früher beschriebenen Bromide an.
    Additional Material: 4 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    ISSN: 0739-4462
    Keywords: insect-plant interactions ; senescence ; aphids ; alfalfa ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Feeding by the spotted alfalfa aphid, Therioaphis maculata (Buckton), on susceptible alfalfa, Medicago sativa L., results in dramatic changes in plant biochemistry that in turn have profound effects on aphid physiology. These aphids select older leaves on the plant as feeding sites. One component of this selection process may be the amount and composition of plant epicuticular lipids, which vary with leaf age. Feeding aphids induce a senescence-like state in the leaf that is characterized by loss of chlorophyll, decreased levels of soluble protein and fatty acids, and increased production of ethylene. This process involves lipid peroxidation and, like senescence, is probably free-radical-mediated. Leaves of alfalfa having resistance to spotted alfalfa aphid contain higher activities of catalase than do susceptible leaves. This enzyme may function in concert with other antioxidant enzymes to quench aphid-induced free radical damage and thus impart resistance. Aphid fatty acid metabolism is altered by changes in plant metabolism and thus reflects the close relationship between aphid and plant biochemistry.
    Additional Material: 7 Ill.
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