1,720,965 research outputs found
Fluvalinate content of Apistan strips during treatment and efficacy in colonies containing sealed worker brood
No full textOver the last few years, s o m e studies w e r e carried out in Sardinia (Italy) o n improv-
ing varroosis management in colonies containing sealed worker brood using Apistan. The fluvalinate content in plastic strips remained almost constant during the 10 weeks of treatment. No significant differences between initial (11.5 + 0.6%) and terminal (10.7 + 0.3%) fluvalinate con- centrationwere observed,indicatingthatremovalbythebeeswas verysmallandtheactiveingredient stripdosagemore thansufficienttocontrolthevarroosis. Apistan application in apiary confirmed an efficacy of over 99%. Most of the mite mortality (> 97%) occurred during the first 4 weeks
Gas chromatographic determination of azoxystrobin, fluazinam, kresoxim-methyl, mepanipyrim, and tetraconazole in grapes, must, and wine
No full textAzoxystrobin, fluazinam, kresoxim-methyl, mepanipyrim, and tetraconazole were determined in grapes, must, and wine by a gas chromatographic method with nitrogen-phosphorus (NP) and mass spectrometric (MS) detectors. Pesticides were isolated from the matrixes by online microextraction with acetone-hexane (50 + 50, v/v). Because of the high selectivity of NP and MS detectors, no interferent peaks were present and no cleanup was necessary. Recoveries from fortified grapes, must, and wine ranged from 80 to 111%, with coefficients of variation ranging from 1 to 14%. Limits of determination were 0.05 mg/kg for kresoxim-methyl and 0.10 mg/kg for the other compounds
Pesticide residues in prune processing
No full textPrunes are processed in three phases: washing, drying, and rehydration, which is performed immediately before packing. The entire drying process was subdivided into six steps. In this paper each of these steps was studied separately in order to determine which could be accountable for residue changes. The studied pesticides were diazinon, bitertanol, iprodione, phosalone, and procymidone. Although the drying process caused a fruit concentration factor of 3, the pesticide residues on the dried fruits were not higher than on the fresh fruits. Phosalone showed the same residue, while the values for procymidone, iprodione, and bitertanol were respectively 0.6, 2.3, and 3.2 times lower. The changes in residue values caused by the different steps were not the same in the different pesticides
Phenolic Compounds in virgin olive oils. I. Low wavelength quantitative determination of complex phenols by high performance liquid chromatography under isocratic elution. Evidence of new compounds
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The behaviour of urinary neopterin in patients with AIDS during follow-up relationship to AZT treatment
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