Search Results - (Author, Cooperation:E. Revilla)
-
1Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2014-06-06Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Animals, Wild ; *Biodiversity ; China ; *Data Mining ; *Databases, Factual ; History, 16th Century ; History, 19th Century ; Hobbies/history ; Human Activities/history ; Natural History/history ; Spain ; Surveys and Questionnaires ; Volunteers/*historyPublished by: -
2Latest Papers from Table of Contents or Articles in PressA. D. Barnosky ; E. A. Hadly ; J. Bascompte ; E. L. Berlow ; J. H. Brown ; M. Fortelius ; W. M. Getz ; J. Harte ; A. Hastings ; P. A. Marquet ; N. D. Martinez ; A. Mooers ; P. Roopnarine ; G. Vermeij ; J. W. Williams ; R. Gillespie ; J. Kitzes ; C. Marshall ; N. Matzke ; D. P. Mindell ; E. Revilla ; A. B. Smith
Nature Publishing Group (NPG)
Published 2012Staff ViewPublication Date: 2012-06-09Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Climate Change/*statistics & numerical data ; *Earth (Planet) ; *Ecosystem ; Environmental Monitoring ; Forecasting ; Human Activities ; Humans ; *Models, TheoreticalPublished by: -
3Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 0021-9673Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyType of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0006-291XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0167-4943Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: MedicineType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0305-0491Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1573-4919Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyMedicineNotes: Summary Addition of benzyl viologen to a cell suspension of the aerobic bacterium Azotobacter chroococcum growing on nitrate resulted in a rapid loss of glutamine synthetase activity as assayed in situ. When a glutamine synthetase preparation which exhibited NADH-benzyl viologen oxidoreductase activity was incubated, under air, with NADH and benzyl viologen, glutamine synthetase was inactivated in a short period of time. This in-vitro inactivation process could be prevented in the presence of added catalase, thus indicating that hydrogen peroxide was involved in the process, and by EDTA, suggesting that metal ions are also involved. The characteristics of the benzyl viologen-dependent glutamine synthetase inactivation observed with externally added H2O2 and a preincubated sample are similar. Inhibition of glutamine synthetase inactivation by histidine suggests that hydroxyl radicals, or something with similar reactivity, is the inactivating agent. The fact that inactivation can also be catalyzed by a model system consisting of Fe2+ and H2O2 leads to the conclusion that hydroxyl radicals are most likely produced in a Fenton reaction in which hydrogen peroxide reacts with adventitious iron ions. Since A. chroococcum contained a high level of catalase it may be concluded that cellular compartmentation plays an important role in the in-vivo inactivation of glutamine synthetase.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1574-4647Source: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Abstract Age-associated changes on guanylate cyclase activity in the lung were investigated using male Wistar rats of ages ranging from 1 to 24 months. In 3 to 24 month old rats there is an increase about 3–4 fold in the activity of this enzyme. The effects of hyperoxia on lung guanylate cyclase activity in adult rats (3 months) were also studied. After 7 days of hyperoxia an increase (about 5 fold) in the activity of this enzyme was found. The relation of these data with the free radical theory of aging is discussed.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1612-1112Keywords: Column liquid chromatography ; Flavonol aglycones ; Isocratic elution ; Wine phenolicsSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary An HPLC isocratic elution procedure which allows the separation of flavonol aglycones in wine without interference from other phenolics of low molecular weight is described. The method has been applied to the separation, identification and quantitative estimation of flavonol aglycones in ether extracts of different Spanish wines (red and white table wines and Sherry finos). The results suggest that these determinations, associated with other analyses, would permit the chemical characterization of wines.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 1573-5036Keywords: Boron ; Chromatography ; Phenol ; TomatoSource: Springer Online Journal Archives 1860-2000Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Summary Leaves of tomato plants grown in a hydroponic culture using a boron toxic solution present a different single phenols composition than those grown using an optimized nutrient solution. The absence of caffeic acid and aesculetin in boron toxic plants at flowering suggests that these compounds can be used as markers for the biochemical diagnosis of boron toxicity in tomato plants.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1612-1112Keywords: Gas chromatography ; Column liquid chromatography ; Carbofuran ; HydroponicsSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary Two analytical methods using GC/NPD and HPLC to analyse carbofuran in a nutrient solution used in hydroponic culture are described. Both methods show a high recovery, (greater than 90%), and their limits of detection are low.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1612-1112Keywords: Column liquid chromatography ; Catechins ; Grape seeds ; Proanthocyanidins ; UV-visible spectroscopy/diode array detectionSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary Reversed-phase, high-performance liquid chromatography coupled to photodiode array detection has been used to analyse catechins and proanthocyanidins extracted from grape seeds. Results show that the ethyl acetate fraction obtained by passing extracts of samples adjusted to pH 7.0 through preconditioned C18 SEP-PAK cartridges contains several catechins and proanthocyanidins. Seven peaks have been assigned to standard catechins and proanthocyanidins on the basis of their retention times and UV spectra. Other peaks which appear in the chromatogram show spectral behaviour similar to that of standard catechins and proanthocyanidins.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1612-1112Keywords: Column liquid chromatography ; Reversed-phase isocratic elution ; Flavonol glycosides ; Wine phenolicsSource: Springer Online Journal Archives 1860-2000Topics: Chemistry and PharmacologyNotes: Summary Isocratic elution from a reversed-phase high performance liquid chromatographic column was used to separate several flavonol glycosides of wines after a preparative isolation which includes column, paper and thin-layer chromatographic procedures. The method has been applied to the separation and identification of flavonol glycosides in wines from different regions in Spain.Type of Medium: Electronic ResourceURL: