摘要:

SUMMARY:An organism which has been frequently isolated from the rhizosphere of plants ofLolium perenne(Perennial Rye‐grass) is described; it has the typical morphology and flagellation ofPseudomonasbut the biochemical reactions ofKlebsiell

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00106.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:Observations on two watercress beds in Kent have confirmed previous findings (Jones&Baker, 1955) that even in comparatively well‐protected beds the coli‐aerogenes content of the water may be high in summer. They have also shown that in spite of circumstances which would lead one to expect pollution, as in the case of one bed, the coli‐aerogenes content can be low in winter. The season appears to influence the content in the water of coli‐aerogenes bacteria, pectate liquefying bacteria and those capable of growing at 37°, but in the case of those growing at 22° other factors can play a more important part, as higher counts were not uncommon in winter. Seasonal effects were less marked with inlet samples; they were less influenced by atmospheric temperature, and little extraneous contamination occurred. Numbers increased as the sampling point moved from inlet

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00107.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:A study was made of selected properties of 189 psychrophilic bacteria isolated from chilled beef and associated sources. Of these, 182 were Gram‐negative and 7 were Gram‐positive. Of the former, 128 were typical pseudomonads with polar flagella. They were resistant to penicillin and oxidized glucose to acid. There were 52 non‐motile Gram‐negative bacteria of which 42 were judged to be pseudomonads on the basis of penicillin resistance and the oxidation of glucose to acid. Flagellar characters were associated with the production of green pigment, with the production of acid from lactose and with resistance to several anti

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00108.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:An apparatus is described for collecting by aspiration allantoic fluid from embryonated eggs infected with influenza or Newcastle disease virus. The essential part of the apparatus is a specially designed ‘automatic pipette’permitting good control of the flow of aspirated fl

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00109.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:Vibrio cyclositesandV. neocistesgrew in a defined medium consisting of a mineral basis, nicotinamide or nicotinic acid and the amino acids methionine, histidine, aspartic acid, phenylalanine andisoleucine. Washed suspensions failed to oxidize any of these substances in the Warburg apparatus. It was not possible with these organisms to demonstrate transamination between the five essential amino acids and α‐ketoglutaric acid or pyruvic ac

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00110.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:The report reviews methods of continuous infrared absorption analysis and gives the description and performance of a commercial infrared CO2analyser. Examples are given of the use of an infrared analyser recorder to measure CO2in effluent air from deep cultures. This measure of metabolic activity can be used to estimate growth rate. It is particularly useful because results are obtained with little or no measurement lag and without the need to sample the culture fluid itself.

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00111.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00112.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:The sporicidal efficiency of an ultra‐high‐temperature (UHT) milk processing plant has been tested using spores of a strain ofBacillus subtilisin milk. With the inoculum and volume of milk adjusted to obtain a countable number of survivors by a conventional dilution counting method, a temperature of 130·5° with the minimum time setting of the plant was found necessary to give a destruction of 99·99999%. This temperature was lower than that found previously (135°) for spores suspended in water and evidence is produced to support the suggestion that UHT milk may be inhibitory to the germination and/or subsequent growth of heated

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00113.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:Thermal death curves for spores ofBacillus subtilis786 have been determined in water and in milk. Generally a non‐logarithmic order of death was observed. Numbers of survivors were lower in milk than in water, suggesting that there may be inhibitory factors in UHT sterilized milk which affect the germination and/or subsequent growth of heated spores.The thermal death curves for spores suspended in milk yielded Q10values of about 30 in the range 110–120°. This is higher than the figures previously reported in the literature forR. subtilisspores. Spores of a number of strains ofB. subtiliswere compared with strain 786 and all gave high Q10values.The results obtained in this work have been used to predict the destruction of spores at higher temperatures in a UHT plant (Burtonet al.1958). The calculated values agree well with the results obtained in the plant by Franklinet al.(1

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00114.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

SUMMARY:A series of 1,040 cultures of coli‐aerogenes bacteria isolated at 30° from farm dairy equipment and raw milk was classified according to the recommendations of the Coliform Sub‐Committee of the Society for Applied Bacteriology (Report, 1949). The distribution of species and types isolated from milk did not differ materially from that for dairy equipment,Klebsiella cloacae, K. aerogenesandCitrobacter freundiibeing the dominant species, while the incidence ofEscherichia coliwas relatively low. There was no marked seasonal incidence of any type, thoughE. coliI formed a slightly higher proportion of the coli‐aerogenes microflora in winter, whereasK. aerogenesI was slightly higher in summer. Many of the cultures of the dominant types,K. cloacae, K. aerogenesI andCit. freundiiI, did not form acid and gas from lactose in two days at 37°. Consequently 37° negative, anaerogenic and paracolon strains constituted a relatively high proporton (49%) of the coli‐aerogenes

ISSN:0021-8847    

DOI:10.1111/j.1365-2672.1958.tb00115.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY