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  • 1995-1999  (3)
  • Adiabatic capture  (1)
  • Antiulcer drugs  (1)
  • Apis mellifera  (1)
  • 1
    ISSN: 1432-1939
    Keywords: Apis mellifera ; Lavandula stoechas ; Pollen content ; Nectar content ; Foraging preference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bees foraging for nectar should choose different inflorescences from those foraging for both pollen and nectar, if inflorescences consist of differing proportions of male and female flowers, particularly if the sex phases of the flowers differ in nectar content as well as the occurrence of pollen. This study tested this prediction using worker honey bees (Apis mellifera L.) foraging on inflorescences of Lavandula stoechas. Female flowers contained about twice the volume of nectar of male flowers. As one would predict, bees foraging for nectar only chose inflorescences with disproportionately more female flowers: time spent on the inflorescence was correlated with the number of female flowers, but not with the number of male flowers. Inflorescence size was inversely correlated with the number of female flowers, and could be used as a morphological cue by these bees. Also as predicted, workers foraging for both pollen and nectar chose inflorescences with relatively greater numbers of both male and female flowers: time spent on these inflorescences was correlated with the number of male flowers, but not with the number of females flowers. A morphological cue inversely associated with such inflorescences is the size of the bract display. Choice of flowers within inflorescences was also influenced predictably, but preferences appeared to be based upon corolla size rather than directly on sex phase.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 98 (1997), S. 33-41 
    ISSN: 1432-2234
    Keywords: Key words: Rate constants ; Cation reactions ; Adiabatic capture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract. Calculations of rate constants for 35 reactions of first and second row monocations with different neutrals are presented. A combined rotationally adiabatic capture and centrifugal sudden approximation is used. The majority of predicted rate constants are in good agreement with the experimental measurements. An exploration of energetics of the potential energy surface for some of those cases in which prediction fails has been done using ab initio G2 theory. These cases usually correspond to situations in which the reaction is not as exothermic as the application of capture approximation requires or secondary barriers exist in the reaction path. Second row cations present these kind of problems due to their smaller electronegativity with respect to cations of the first row.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-7284
    Keywords: Antacid ; Antiulcer drugs ; Drug prescription ; Pharmaco-epidemiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: A study is made of the pharmaco-epidemiology of antacid (ATC class A02A) and antiulcer (A02B) drug prescriptions during the year 1992. Methods: Prescription data were extracted from 1941 case histories of patients over 15 years old from four health care centers in the Valencian Community (Spain). Dosage and treatment duration were evaluated, along with the way in which morbidity, self-evaluated health, the demographic pattern and lifestyle characteristics influence drug prescription. Results: The proportion of drug prescriptions increased with age in both sexes (p 〈 0.01). Drug use depended mainly on chronic diseases. In prescribing antacids, the most influential diagnosis was gastritis (ICD 534, OR: 157), followed by duodenal ulcer (ICD 532, OR: 152) and gastric ulcer (ICD 531, OR: 122), other gastrointestinal disorders (ICD 66, OR: 54) and undefined diagnoses (OR: 15). In the prescription of antiulcer drugs, the most influential diagnoses were gastric and duodenal ulcer (OR: 380 and 342, respectively), and a significant relation was observed with the diagnosis of osteomuscular diseases (OR: 6). Lifestyle and demographic pattern were of marginal importance. The estimated duration of treatment was 85 days. No significant differences were observed in either treatment duration or administered doses of almagate, ranitidine and omeprazole with respect to sex, age or diagnosis. Conclusions: Prolonged treatment is common for acid suppression. The widespread use of peptic ulcer drugs is mostly due to excessive prescription for non-ulcer dyspepsia. At the same time, many patients consume these drugs on a long-term basis in the absence of a clear diagnosis. This observation supports the need for appropiate diagnostic and prescription protocols to secure increased economical savings and management results.
    Type of Medium: Electronic Resource
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