Search results for "Initial rate"

showing 3 items of 3 documents

Seed oils as additives: penetration of triolein, methyloleate and diclofop-methyl in maize leaves

1992

Summary: Resume: Zusammenfassung Methyl ester derivatives of seed oils have a greater effect on graminicide efficacy than the parent oils. To explain this difference, we investigated the penetration of the radiolabelled oils, triolein (TRI) and methyl oleate (MEO), in maize leaves, and their influence on diclofop-methyl penetration. Over a period of 3 h 30% of applied TRI penetrated maize leaves, but no further penetration was observed. In contrast, MEO entry proceeded regularly to 72% over a period of 27 h. The amount of oil found in epicuticular wax (chloroform wash) was generally less than 4% of the recovered label, and was even lower (<1%) in ‘glossy 1’ hybrids which have no crystalline…

0106 biological sciencesDICLOFOP-METHYLPlant Science01 natural sciencesMedicinal chemistrychemistry.chemical_compound[SDV.BV]Life Sciences [q-bio]/Vegetal Biology[SDV.BV] Life Sciences [q-bio]/Vegetal BiologyTrioleinDiclofop-methylEcology Evolution Behavior and SystematicsComputingMilieux_MISCELLANEOUSInitial rate2. Zero hungerMethyl oleateEster derivatives04 agricultural and veterinary sciencesPenetration (firestop)METHYLOLEATEZea maysBiochemistrychemistry040103 agronomy & agriculture0401 agriculture forestry and fisheriesAgronomy and Crop Science010606 plant biology & botany
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Photoinductive efficiency of soil extracted humic and fulvic acids

2002

Humic and fulvic acids extracted from soils of different genesis were investigated for their ability to photoinduce the transformation of fenuron (2 x 10(-4) mol(-1)) at 365 nm. The ratio of the initial rate of fenuron consumption over the rate of light absorption by humic substances was found to be higher for fulvic acids (range 2.0 x 10(-3) to 9.0 x 10(-5)) than for humic acids (range 1.7 x 10(-4) to - 3.6 x 10(-5)). Within the FAs population, this ratio decreased as the specific absorption coefficient at 365 nm increased. It seems therefore that most of 365-nm absorbing components have no photoinductive activity and even reduce that of photoinductive chromophores.

Environmental EngineeringLightPhotochemistryHealth Toxicology and MutagenesisPopulationChemistry Techniques AnalyticalSoilEnvironmental ChemistryHumic acidBenzopyransOrganic mattereducationUltraviolet radiationHumic SubstancesInitial ratechemistry.chemical_classificationeducation.field_of_studyRadiationChromatographyPhenylurea CompoundsPublic Health Environmental and Occupational HealthGeneral MedicineGeneral ChemistryPollutionSoil contaminationBiodegradation EnvironmentalchemistryEnvironmental chemistrySoil waterPhotochemical degradationChemosphere
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Der nachweis der primärreaktion bei der autoxydation des tetralins

1964

Die Autoxydation des Tetralins wurde bei kleinen Umsatzen durch polarographische oder kolorimetrische Bestimmung des Peroxidgehaltes verfolgt und eine Anfangsgeschwindigkeit gefunden, die groser ist, als sie nach dem Peroxidgehalt des Tetralins sein sollte. Diese zusatzliche Reaktionsgeschwindigkeit ist die der Primarreaktion der Autoxydation. Dabei bilden sich aus Tetralin und molekularem Sauerstoff Radikale. Diese Primarreaktion ist nur dann beobachtbar, wenn der Peroxidgehalt des Tetralins etwa 10−5 Mol/l betragt oder kleiner ist. The autoxidation of tetraline was measured to a low degree of conversion by polarographic or colorimetric determination of tetraline hydroperoxide. The extrapo…

chemistry.chemical_compoundPrimary reactionchemistryAutoxidationRadicalPolymer chemistryMolecular oxygenPeroxideInitial rateDie Makromolekulare Chemie
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