Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1980-1984  (4)
  • 1975-1979  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 12 (1982), S. 0 
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. The oxidation of 2, 5-diniethylfuran (DMF) to cis-1, 2- diacetylethylene (DAE) is a specific test for singlet oxygen (1O2). A method has been developed for the measurement of DAB by direct injection gas chromatography. By the use of this method, the photochemical generation of 1O2 has been demonstrated in samples of two Canadian humic waters.Two other photochemical reactions probably mediated by 1O2generation, the oxidation of histidine and the inactivation of a-chymotrypsin, have been demonstrated in these waters.The possible ecological and environmental implications of these findings are discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 154-156 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The rate of condensation and polymerisation of silicic acid and organo-silanol derivatives in aqueous solution can be reduced by the addition of polar molecules such as ethers, alcohols and amines and of polymers containing similar groups4. The retardation is believed to be due to association ...
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 31 (1983), S. 203-207 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 52 (1982), S. 389-395 
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A simple life table model was constructed for Tetranychus urticae in which daily survivorship of eggs and motil stages, fecundity, and development time was altered to assess the impact of each parameter on the intrinsic rate of increase. r. Interpretation of the trade-offs focused on management considerations. A second aspect of the study concerned age and stage structure in mite populations including the time path of convergence to a stable age distribution and the effect of changes in birth and death rates on the age profile. The stable stage distributions of 7 tetranychid mite species were computed using 25 separate life tables. In spite of the wide range of r-values induced by different experimental conditions, all of the stage distributions were quite similar averaging roughly 66% eggs, 26% immatures, and 8% adults. Several population studies were cited which reported stage distributions of growing mite populations. The empirical evidence suggested that natural mite populations are often quite near this stable distribution. A practical problem involving the extent to which hormoligosis (insecticide stimulation) affects mite population growth rate was addressed using the life table model and laboratory data from controlled studies. The findings suggested that mite populations treated with insecticide may attain a 1.4- to a 4.2-fold difference in population size relative to an untreated population after 2 generations and over a 1,300-fold potential difference after 10 generations.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 34 (1983), S. 13-19 
    ISSN: 1570-7458
    Keywords: Grape phylloxera ; Viteus vitifolii ; Resistant rootstocks ; Life tables ; Cabernet Sauvignon ; Muscat of Alexandria ; Ganzin I ; St. George
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Le Phylloxera de la vigne, Viteus vitifolii Shimer, a été élevé sur des racines coupées en boîte de Pétri. Les tables de vie ont été établies en utilisant deux variétés sensibles de Vitis vinifera L. (Cabernet—Sauvignon et Muscat d' Alexandrie) et deux variétés résistantes de Vitis rupestris (Saint Georges en Ganzin I). Sur les variétés résistantes, le Phylloxera avait des taux de fixation du premier stade plus faibles (24 et 9.5%) que sur les variétés sensibles (57 et 36%). De la même façon, les taux bruts (G.R.R.) et nets (R0) de la reproduction étaient plus bas sur les variétés résistantes que sur les variétés sensibles. La durée moyenne d'une génération (T) était variable (19 à 49 jours) et ne paraissait pas liée à la sensibilité des variétés. Le taux net d'accroissement (λ) était inférieur à 1 sur les variétés résistantes, contre 1,06 et 1,10 sur les variétés sensibles. Sur Cabernet—Sauvignon, le Phylloxera avait des valeurs de G.R.R., R0 et T supérieures sur les tubérosités que sur les nodosités. Cependant les valeurs de λ étaient à peu près égales (1,05 et 1,07, respectivement) sur les tubérosités et les nodosités.
    Notes: Summary Grape phylloxera, Viteus vitifolii Shimer, were reared on excised grape roots maintained in petri-dish chambers. Life tables were constructed using 2 susceptible rootstocks, Vitis vinifera L. Cabernet Sauvignon and Muscat of Alexandria, and 2 resistant rootstocks V. rupestris St. George and Ganzin I. Phylloxera on the resistant varieties had lower rates of 1st-instar establishment (24% and 9.5%) than on the susceptible varieties (57% and 36%). Similarly, gross reproductive rates (GRR) and net reproductive rates (R0) on the resistant varieties were lower than on the susceptible varieties. Mean generation times (T) were variable (19–49 days) and appeared not to be related to rootstock susceptibility. Finite rates of increase (λ) were less than 1.0 on the resistant varieties, and 1.06 and 1.10 on the susceptible varieties. Phylloxera on Cabernet Sauvignon tuberosities had higher GRR, R0 and T-values than on the nodosities. However, λ-values were nearly equal, 1.05 and 1.07 on the tuberosities and nodosities, respectively.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...