摘要:

AbstractThe effects on foraging bees of spray formulations of demeton‐methyl and granular formulations of disulfoton and phorate applied to field beans in flower, were compared. Sprays killed honeybees foraging on the beans, whereas granules did not, either immediately after application or later. After becoming systemic in plants, the insecticides seemed harmless to bee

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180401

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractA method has been developed for the detection of coliform organisms in foodstuffs which is an alternative to the standard MacConkey test. A relationship has been established between the number of organisms originally present and the time required for their detection. The new method makes use of radioactive tracers and requires less time to confirm the presence of coliform contamination.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180402

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractSoils of four different types were treated with a relatively high dosage level (15 ppm) of14C‐chlorfenvinphos and were stored at about 22° for four months. After this time the following radio‐labelled compounds were detected in the moist soils: unchanged chlorfenvinphos, 1.0‐4.7 ppm; 1‐(2′4′‐dichlorophenyl)ethan‐1‐ol, 0.06‐1.0 ppm; 2,4‐dichloroacetophenone, 0.1‐0.5 ppm; desethyl chlorfenvinphos, 0.1‐0.2 ppm; (2′,4′‐dichlorophenyl)ethan‐1,2‐diol,<0.03 ppm; salts or conjugates of desethyl chlorfenvinphos, 0.05‐0.6 ppm; 2,4‐dichlorophenyloxirane,<0.005 ppm; 2,4‐dichlorophenacyl chloride,<0.005 ppm.Soils were also treated with 3‐4 lb/ac14C‐chlorfenvinphos and cabbages, onions, and carrots were grown to maturity in the soils. The edible part of cabbages at harvest contained no detectable chlorfenvinphos or breakdown products of it when the limit of detectability was about 0.005 ppm. At harvest at 8‐10 weeks after soil application of chlorfenvinphos the edible roots of carrots contained 0.12 ppm of unchanged chlorfenvinphos, and onion bulbs contained 0.07 ppm. There was evidence of trace amounts of a compound, probably a salt or conjugate of desethyl chlorfenvinphos, in onions (<0.01 ppm) and in carrots (0.024 ppm or less). Carrots also contained trac

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180403

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractA highly significant relationship was established between milk iodine content for bulk milk of the herd and the calculated daily iodine intake of cows in the herd. It is suggested that where bulk milk iodine content is less than 25 μg/litre the probability exists that what are at present suggested as the iodine requirements for dairy herds with average yields are not being met

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180404

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractTwelve cationic surface‐active agents, quaternary ammonium and pyridinium salts, of widely different wetting ability were tested as eradicant fungicides againstErysiphe graminison oats, at both equal wetting power and equal concentration. At equal wetting power there were wide differences in fungitoxicity but, in general, the compounds with the greatest wetting ability were the most effective fungicides. It is suggested that mechanical injury by wetting of oat powdery mildew is not the only determinant of toxicity but that the ability of these compounds to penetrate the fungal conidia is related to their physico‐chemical structure which determines wetting po

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180405

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractA study of the growth of oats in peat of very low copper content has been made. It was found that various nutrient amendments improved growth but the effect of copper was overriding. There was some evidence for copper unavailability due to fixation by organic matter, but it appears that the known interactions between major and minor elements largely determined the appearance and severity of copper deficiency.

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180406

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractThin‐layer chromatography has been used to separate the carotenoids and some of the quinones present in lipid extracts of the leaves of sugar beet and cabbage. These compounds have been identified and estimated spectrophotometricall

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180407

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractThepsoas majorandsemitendinosusmuscles from ten Hereford Shorthorn steers were analysed. Five of the steers had been severely restricted in their diet during an Irish winter period (temperature range 3–13°) of 20 weeks. The remaining five were used as controls and were adequately fed throughout their lives. After the restriction period the five diet‐restricted animals were adequately fed for 22 weeks. All ten steers were then slaughtered at the age of 20 months.Within each type of muscle there were no significant differences between treatments in the components, moisture, intramuscular fat, total protein, ash, intramuscular collagen, hexosamine hydrochloride, or in Warner Bratzler shear values. The correlations between intramuscular fat and shear values, and between hexosamine hydrochloride and shear values were low and not significant. Collagen contents correlated significantly with shear values at the 10% level of significance.There was no evidence that variation in tenderness (as measured by shear values) could be attributed to the pre‐slaughter treatment or that any deterioration in meat quality was caused by this tre

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180408

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractDimeric 3‐methylcyclopentadienone was obtained by dehydrobromination of 4‐bromo‐3‐methylcyclo‐pentenone and by hydrolysis of 4‐hydroxy‐3‐methylcyclopentenone formate. Four structures for the dimer were possible. Synthesis and spectroscopic evidence showed that the dimer obtained was formed by addition to the unsubstituted double bond, with the methyl group on the norbornene ring in the position more remote from the carbonyl group of the cyclopentenone. Decarbonmonoxylation of the dimer gave 3,5‐dimethylindanone, synthesised for comparison by another route.Contrary to an earlier report, pyrolysis of 9,10‐dihydro‐9,10(4,5‐3‐methylcyclopent‐2‐enono)anthracene (obtained by alkaline cyclisation of the adduct of anthracene and diacetyl ethylene) gave mainly 3,5‐dimethylindanone and not 3‐methylcyclopentadienone.Rethrins with no side chain in the alcoholic part of the molecule were synthesised from 4‐bromo‐3‐methylcyclopent‐2‐enone. Allethrolone cyclopropane carboxylate was made for comparison of its insecticida

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180409

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY

摘要:

AbstractThe effect of potassium concentration in the nutrient medium on growth and mineral composition (N, K, P, Ca, Mg, Na) of red beet, cabbage, lettuce and Italian ryegrass in sand culture was investigated. It was shown that the results and those of some earlier workers can be interpreted as a simple linear relationship by means of the equation: whereyis plant weight or leaf potassium content,xis potassium concentration in the nutrient medium and a, b and x0are constants. Sand‐grown plants contained relatively high concentrations of sodium, which played an important part in the maintenance of cation balance under these conditions. In red beet, cabbage and ryegrass, changes in potassium content were almost completely balanced by corresponding changes in sodium content with relative constancy of calcium and magnesium, whereas in lettuce, calcium and magnesium also functioned in maintaining the balanc

ISSN:0022-5142    

DOI:10.1002/jsfa.2740180410

出版商:John Wiley&Sons, Ltd    

年代:1967

数据来源: WILEY