摘要:

Wall analyses on recently isolated strains of Willoughby's ‘spore‐dome’ actino‐mycetes grown in submerged culture would suggest that the peptidoglycan containedll‐diaminopimelic acid (ll‐DAP) ormeso‐DAP or even mixtures of the two isomers. This chemotaxonomic paradox was explained when it was shown that the vegetative mycelium had walls containingll‐DAP and glycine (wall chemotype I) and that spores contained onlymeso‐DAP as the diagnostic amino acid (wall chemotype III). Our earlier data had been obtained from preparations derived from biomass containing mixtures of spores and ve

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00277.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

A method previously used for the analysis of organic acids in silage has been applied to the detection and quantification of acidic fermentation products (C1to C6volatile fatty acids, lactic and succinic acid) of rumen bacteria and anaerobic fungi grown in pure culture. The acids were converted to tertiary butyldimethylsilyl derivatives prior to separation on a 30 m DB1 capillary gas chromatographic column. The quantitative recoveries of formic and succinic acids were found to be comparable to the recoveries of other acids reported in the original study. The quantitative recovery of lactic acid was found to be dependent on storage of the samples at ambient temperature for at least 24 h following derivatization. The simultaneous determination of a wide range of volatile and non‐volatile acidic products is an important feature of this metho

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00278.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The growth and pigmentation of 99 strains ofFusarium, mainly ofFusarium oxysporumandF. solani, on ammonium salts agar containing either mannitol, sorbitol or xylitol as sole source of carbon is described. After 7–14 d incubation strains ofF. oxysporumcould be distinguished fromF. solaniby both their pigmentation and the size and shape of conidiogenous cells. The application of these media to routine screening of isolates is discusse

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00279.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Data from analyses of the fermentation of cassava slurry were used to derive kinetic constants for the rate of hydrolysis of bound cyanide, formation of free cyanide, pH change and fermentation. The pseudo‐kinetic constant for the decay of bound cyanide was 1·6 times 10‐2/h and 2·5/h for free cyanide. Under the experimental conditions, the concentration of bound cyanide at any time during fermentation was 22·65e‐0·016tμg/g, wheretis time in h. The fermentation rate constant was determined as 2·2871 times 1019. Based on the empirical expressions of the rate data, it is believed that rate constants of the intrinsic parameters of fermentation of systems similar to cassava slurry could be

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00280.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Three close‐fitting lid fermenters were incubated at 27 ± 2°C for 120 h. ‘A’ served as a control and contained 100 ml raw goats' milk; ‘B’ contained 50 ml 48‐h‐old nono as starter culture plus 50 ml pasteurized milk; and ‘C’ contained 100 ml pasteurized milk only. The pH and lactic acid contents were determined at intervals. Fermenter ‘B’ gave the best results in that the milk reached the lowest pH values and the highest lactic acid contents, and this resulted in a more appeti

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00281.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Aureobasidium pullulansis a new source of enzyme beta‐galactosidase with optimum activity at pH 6·8 and a temperature of 45°C. Lactose induced enzyme synthesis, but low constitutive levels of enzyme were seen with other sugars. Addition of Mn2+and Ca2+increased enzyme production and activity. Co2+was a strong activator of enzyme activity. The enzyme is stable over a pH range of 5–10 and temperatures up to 45°C. These studies are significant for studying production of pullulan by using lactose or chees

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00282.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

The efficacy of cinnamon oil, individually and in binary mixture with sodium chloride (NaCl), in preserving stored corn from fungal invasion and subsequent deterioration was investigated. It was observed thatAspergillus flavusandA. glaucus, the predominant storage fungi, invade corn during storage with the concomitant production of aflatoxin and the resultant loss of germinability in grains. The treatment with cinnamon oil at the non‐phytotoxic level of 5 μl/g corn in combination with 10 μl/g NaCl solution (5%) inhibits synergistically the fungal infection, growth and aflatoxin production together with the deterioration of grains (loss of germinability). However, the test oil, when applied alone, was found to be effective only at the phytotoxic level of 20 μl/g

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00283.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Book reviewed in this article:ElectrochemicalDetectionTechniquesInTheAppliedBiosciencesVolume 2 (1988). By G‐A. JunterPlantResistanceToViruses(1987). Edited by D. Evered&S. HarnettMicrobialRecontaminationInDairyProcessing–ProceedingsOfTheInternationalCongress.DevelopmentsInFoodMicrobiology–4 (1988). Edited by R.K. Robinson.CelluloseHydrolysis(1987). Edited by L. T. Fan, M.M. Gharpuray&Y.‐H. LeeImmobilizationOfCells(1988). By C.R. Phillips&Y.C. PoonCrystallineBacterialCellSurfaceLayers(1988). Edited by U.B. Sleytr, P. Messner, D. Pum

ISSN:0266-8254    

DOI:10.1111/j.1472-765X.1989.tb00284.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY