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  • 1995-1999  (1)
  • 1990-1994  (1)
  • 1935-1939
  • Retinoids  (1)
  • Yeast communities  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Yeast communities of the cactusPilosocereus arrabidae as resources for larval and adult stages ofDrosophila serido (1994)
    Springer
    Antonie van Leeuwenhoek 66 (1994), S. 313-317 
    Details
    ISSN: 1572-9699
    Keywords: Yeast communities ; Drosophila serido ; cactus ; feeding behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The feeding behavior ofDrosophila serido on the yeast communities of necrotic stem tissue ofPilosocereus arrabidae were studied in a sand dune ecosystem of Rio de Janeiro, Brazil. The prevalence of cactophilic yeasts includingPichia barkeri, Candida sonorensis andGeotrichum sp. in the crops and external surfaces ofD. serido reflected its association with the cactus habitat. The effective number of yeasts vectored on the surface of flies was higher than that in the crops. Also overlap between the yeasts from stems and from crops was partial suggesting selective feeding by the flies in the substrates visited. The females had a higher effective number of yeast species and a lower similarity than males with the yeast community ofP. arrabidae. This was probably related to the search for oviposition sites by females. The presence ofPichia thermotolerans-like andPichia amethionina varpachycereana in the flies, but not inP. arrabidae stems, indicated thatD. serido was not limited to this cactus species. The larvae and adults lived in different patches with the adults feeding in patches with higher yeast species richness. The larvae had a narrower feeding niche and higher overlap withP. arrabidae, and preferredP. barkeri andPichia cactophila as food. Adult flies fed on patches with the most frequent yeasts except forP. cactophila. Pichia caribaea was found in higher frequency in the adult crops than in the stems. Our data suggested that there was food selection and diet partitioning between adult and larval stages ofD. serido.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882766
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  • 2
    Electronic Resource
    Electronic Resource
    Peeling agents and irritants, unlike tretinoin, do not stimulate collagen synthesis in the photoaged hairless mouse (1996)
    Springer
    Archives of dermatological research 288 (1996), S. 615-620 
    Details
    ISSN: 1432-069X
    Keywords: Key words UV radiation ; Matrix repair ; Retinoids ; Irritants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Tretinoin has been shown to stimulate the synthesis of collagen in photoaged human and hairless mouse skin. It has been suggested that this partial reversal of photodamage by tretinoin is a consequence of low-grade inflammation. The purpose of this study was to compare the effect of tretinoin with a number of irritants and peeling agents on collagen synthesis. Hairless mice were irradiated thrice weekly for 10 weeks with UVB. In the 10-week postirradiation period, the mice were treated topically five times per week with tretinoin (0.05%), glycolic acid (10%), benzalkonium chloride (1.0%), sodium lauryl sulfate (5%), croton oil (5%) and the water – propylene glycol vehicle. Microscopic measurements showed that the tretinoin-induced zone of new collagen was twice the depth of that induced by irritants or vehicle. The salt-soluble collagen content was determined by HPLC analysis of hydroxyproline levels. Type III procollagen was quantified by radioimmunoassay. Tretinoin-treated skin had increased amounts of collagen and type III procollagen whereas irritant- and peeling agent-treated skins were similar to vehicle-treated controls. Immunofluorescence studies were confirmatory. These results demonstrate that these agents, unlike tretinoin, do not have the capacity to enhance collagen synthesis. Therefore, it is likely that the effect of tretinoin does not depend upon irritation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004030050112
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    Paper (German National Licenses)
    Fulltext
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