摘要:

AbstractA preliminary investigation has shown that methyl isothiocyanate is the principal product of decomposition of sodium N‐methyldithiocarbamate (metham‐sodium) when applied to soil. Methyl isothiocyanate can react with aqueous ammonia hydroxide to afford N‐methylthiourea, but surface applications of ammonium compounds to assist this reaction in soil were found to be without significant effect under outdoor conditions.Concentrations of I p. p. m. of isothiocyanate and 50 p. p. of N‐methylthiourea in soil under similar conditions were phy

ISSN:0022-5142    

DOI:10.1002/jsfa.2740130601

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractThe unsaponifiable matter of an Aleurites montana tung oil (Nyasaland) has been examined and found to contain some 46% of Δ5‐stigrnasten‐3βT‐ol, 9% of α‐tocopherol, 36% of y‐tocopherol, 3% of tocopherol artifact and 0.16% of carotenoid pigment (determined on the original oil). No evidence for the previously reported presence of α‐glyceryl ether or squalene to the extent suggested by former wo

ISSN:0022-5142    

DOI:10.1002/jsfa.2740130602

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractWhen unyeasted wheat flour doughs were incubated for 14 h. at 303°, the dialysable nitrogen level rose from 19.4 to 35.7 mg./100 g. of flour. Concurrent increases in amino‐peptide and ammonia nitrogen were also observed. The addition of antibiotics to yeastless doughs markedly changed the pattern of the distribution of non‐protein‐nitrogen on incubation. It is believed that much of the increase in free ammonia on incubation arises from changes induced in the gluten pr

ISSN:0022-5142    

DOI:10.1002/jsfa.2740130603

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractThe autolysis of proteins in leaf extracts and the proteolytic activity of crude preparations from such extracts against casein, as added substrate, was studied. If the proteins are not precipitated soon after preparation of extracts, they autolyse, and the loss from autolysis is directly related to the temperature and to the interval between preparing the extract and precipitating proteins. The advantages of the use of the NPN‐increment over other methods as ail index of protein hydrolysis are discussed. This method was used to study the proteolytic activity of leaf extracts from eleven plant species with no latex. Leaf proteases from these plants form a homogeneous group with low activity per g. of protein‐N, and evidence is given suggesting that they belong to the SH‐group of enzymes with optimum pH between 5.2 and 5.7. Protease activity per g. of protein N increases in the leaves of wheat during the transformation of the shoot apex from vegetative into reproductive

ISSN:0022-5142    

DOI:10.1002/jsfa.2740130604

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractA study was made of the efficiency for chicks of different types of vitamin‐A concentrates. The influence of two different levels of protein (17 and 26%) and of two kinds of fat supplements (soya‐bean oil and acidulated soya‐bean oil soapstock) on storage of vitamin in the liver was also studied. Vitamin‐A utilisation, as judged by liver storage and survival, is best when the vitamin is given as a gelatin‐coated preparation. Utilisation of the vitamin is not influenced by variation of the dietary protein level within the range likely to encountered in practical management. Supplementation of the diet with the above mentioned fats seemed to improve the utilisation of the vitamin, but this effect may have been caused by the tocopherol content of

ISSN:0022-5142    

DOI:10.1002/jsfa.2740130605

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractA method of sampling commercially‐treated grassland is described and the yield‐responses following the application of gas liquor and other fertilisers are discussed. Investigations on the scorch effect of the liquor are reported and further developments in its use in agriculture are given in outl

ISSN:0022-5142    

DOI:10.1002/jsfa.2740130606

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY

摘要:

AbstractA number of Streptomyces strains producing streptothricin‐like antibiotics have been examined, and their products compared with known members of this group. Circular paper chromatography has indicated that these antibiotics are mixtures of up to six components with high antibacterial and antifungal activity. Components separated by column chromatography and tested against powdery mildews on plants showed eradicant and protective action. Very high antimildew activity was found in a major component D and also in component F which corresponded to streptothricin. More detailed work showed that some of these components could be fractionated further. Details of the cultures and methods of fermentation and extraction are give

ISSN:0022-5142    

DOI:10.1002/jsfa.2740130607

出版商:John Wiley&Sons, Ltd    

年代:1962

数据来源: WILEY