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  • 2000-2004  (5)
  • 1985-1989  (4)
  • 1950-1954
  • 1935-1939
  • 1915-1919
  • 2003  (4)
  • 2001  (1)
  • 1988  (4)
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  • 2000-2004  (5)
  • 1985-1989  (4)
  • 1950-1954
  • 1935-1939
  • 1915-1919
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    CONTACT CHEMORECEPTION IN FEEDING BY PHYTOPHAGOUS INSECTS (2003)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 48 (2003), S. 455-484 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract Gustatory receptors associated with feeding in phytophagous insects are broadly categorized as phagostimulatory or deterrent. No phytophagous insect is known that tastes all its essential nutrients, and the ability to discriminate between nutrients is limited. The insects acquire a nutritional balance largely "adventitiously" because leaves have an appropriate chemical composition. Sugars are the most important phagostimulants. Plant secondary compounds are most often deterrent but stimulate phagostimulatory cells if they serve as host-indicating sign stimuli, or if they are sequestered for defense or used as pheromone precursors. The stimulating effects of chemicals are greatly affected by other chemicals in mixtures like those to which the sensilla are normally exposed. Host plant selection depends on the balance of phagostimulatory and deterrent inputs with, in some oligophagous and monophagous species, a dominating role of a host-related chemical. Evolution of phytophagy has probably involved a change in emphasis in the gustatory system, not fundamentally new developments. The precise role of the gustatory systems remains unclear. In grasshoppers, it probably governs food selection and the amounts eaten, but in caterpillars there is some evidence that central feedbacks are also involved in regulating the amount eaten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ento.48.091801.112629
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  • 2
    Electronic Resource
    Electronic Resource
    Large-scale genetic differentiation of Pagrus pagrus in the Atlantic (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 62 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Red porgy Pagrus pagrus from the north-eastern, north-western and south-western Atlantic were found to be genetically distinct as determined by mitochondrial DNA analysis. There were no shared composite restriction fragment haplotypes, and nucleotide sequence differences averaged 2% among these locations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00110.x
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  • 3
    Electronic Resource
    Electronic Resource
    Randomized comparison of photodynamic therapy with topical 5-fluorouracil in Bowen's disease (2003)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 148 (2003), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Background Bowen's disease (BD; intraepithelial squamous cell carcinoma) is therapeutically challenging because lesions, which may be multiple, are frequently located at sites that heal poorly. There is a small risk of progression to invasive carcinoma. Photodynamic therapy (PDT) is an effective treatment for certain non melanoma skin cancers, but comparison studies with other, better-established therapies are limited. Objectives To compare the efficacy and tolerability of PDT and topical 5-fluorouracil (5-FU) in BD. Methods Forty patients from two centres were randomized to either topical PDT or 5-FU. The PDT group was treated with 20% 5-aminolaevulinic acid (ALA) applied 4 h before illumination with 100 J cm−2 narrowband red light (630 ± 15 nm). 5-FU was applied to lesions for 4 weeks. A repeat treatment cycle was performed after 6 weeks if required. Results Twenty-nine of 33 (88%) lesions treated with PDT initially responded completely, compared with 22 of 33 (67%) after 5-FU. After 12 months, two recurrences in the PDT group and six in the 5-FU group reduced complete clinical clearance rates to 82% and 48%, respectively. PDT was significantly more effective (P = 0·006, odds ratio 4·78, 95% confidence interval 1·56–14·62). In the 5-FU group, severe eczematous reactions developed around seven lesions, ulceration in three and erosions in two. No such reactions occurred following PDT. There was no difference in overall pain experienced during each therapy. Conclusions Topical ALA-PDT is more effective than topical 5-FU in the treatment of BD, with fewer adverse events. ALA-PDT should be considered one of the first-line therapeutic options for BD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.2003.05033.x
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  • 4
    Electronic Resource
    Electronic Resource
    The yrast spectroscopy of neutron-rich nuclei produced in deep-inelastic processes (2003)
    Springer
    The European physical journal 20 (2003), S. 111-112 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The highly sensitive GASP array at the INFN Legnaro Laboratory was used to study the $\gamma$ -ray de-excitation of neutron-rich nuclei produced in the deep-inelastic processes which occur when 230 MeV 36S ions interact with a target of 176Yb. Yrast decay schemes were identified in over forty target-like fragments and in over twenty projectile-like fragments. Analysis of the data has resulted in extensions to the yrast decay sequences of the target-like species, 176Hf, 166Er, 172Yb, and 152Sm. New transitions have also been observed in a number of projectile-like species including 34P and 41Cl. Experimental results are compared with the results of shell model calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10334-y
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  • 5
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    Unknown
    There Is Something to Be Said (1988)
    Washington, etc. : Periodicals Archive Online (PAO)
    Poet lore. 83:3 (1988:Fall) 26 
    Details
    ISSN: 0032-1966
    Topics: English, American Studies
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:3208-1988-083-03-000014
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  • 6
    Electronic Resource
    Electronic Resource
    The cost of complexity (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 21-22 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the nineteenth century, the discovery and study of 'lost civilizations' gave great impetus to the development of archaeology. The surviving traces of such civilizations - whether in the Mycenaean and Minoan palaces of the Aegean, the frontier defences of the Roman Empire, the pyramids of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335021a0
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical aspects of host-plant specificity in threeLarrea-feeding grasshoppers (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 561-579 
    Details
    ISSN: 1573-1561
    Keywords: Creosote bush ; Larrea ; nordihydroguaiaretic acid ; grasshoppers ; monophagy ; Bootettix ; Ligurotettix ; Cibolacris ; Orthoptera ; Acrididae ; host selection ; feeding deterrence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The host-selection behavior of three species of grasshopper feeding on creosote bush,Larrea tridentata, in southern California was investigated. The species wereBootettix argentatus, which is monophagous;Ligurotettix coquilletti, oligophagous; andCibolacris parviceps, polyphagous. The monophagous species is stimulated to bite by nordihydroguaiaretic acid (NDGA), a compound that is characteristic of the host plant and that may comprise up to 10% of the dry weight of the leaf. Host specificity ofB. argentatus is enhanced by deterrent responses to compounds present in the surface waxes of all non-host-plant species. Both the oligophagous and polyphagous species are deterred by NDGA at naturally occurring concentrations. Their association withLarrea is probably based on tolerance of the plant chemicals rather than on dependence on specific chemicals. Factors other than the chemistry of the plant probably also contribute to the specificity ofB. argentatus andL. coquilletti.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01013907
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  • 8
    Electronic Resource
    Electronic Resource
    High-spin states in neutron-rich Dy isotopes populated in deep-inelastic reactions (2001)
    Springer
    The European physical journal 10 (2001), S. 41-47 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 ?A? 189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: High-spin states in neutron-rich Dy isotopes, populated in deep-inelastic processes produced by the interaction of 234 MeV 37Cl ions with a 160Gd target, have been studied using the highly sensitive EUROBALL IV gamma-ray detector array. The previously known level schemes for 159,160,161,162Dy have been extended to significantly higher spin ( ? 30?) and the i 13/2 band crossing in 159Dy has been observed for the first time. The experimental results are discussed within the framework of cranked shell model and projected shell model calculations with particular reference to the observed delayed band crossing in 162Dy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500170142
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  • 9
    Electronic Resource
    Electronic Resource
    Pesticide-induced mite outbreaks: pyrethroids and spider mites (1988)
    Springer
    Experimental and applied acarology 4 (1988), S. 265-276 
    Details
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Factors inducing outbreaks of spider mites (Acari: Tetranychidae) following use of pyrethroid insecticides are reviewed. Differentials in direct toxicity between spider mites and phytoseiid (Acari: Phytoseiidae) predators provide one explanation. Wide variation exists between pyrethroids in their direct toxicity toTetranychus urticae. The acaricidal action of pyrethroids is largely controlled by the amount of irritancy or repellency induced by the respective chemicals. Laboratory assays for repellency reflect field results. Repellent activity induces spider-mite dispersal to either recolonise plants free of residues or leave the treated habitat. Pyrethroids may also affect reproduction and development rates. Residual activity is likely to vary, so limiting any general theory of spider-mite responses to pyrethroids. Variable responses to pyrethroids, strain variation and development of behavioural resistance also add complications to understanding outbreaks. Future research needs are identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196190
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