摘要:

AbstractCalothrix marchica LEMM. var.intermediaRAO has been found to grow abundantly in soil receiving the effluent of a molasses distillery. The effluent at low concentrations (1–10%, v/v) and at neutral pH increased the growth of the organism. The cyanobacterium grew photoheterotrophically as well as chemoheterotrophically in the medium supplemented with sucrose and lower concentration (10%, v/v) of neutralized distillery effluent. The exogenous carbon sources were also utilized probably in certain specific biosynthetic process, for example, in the synthesis of sheath layer around the trichome of the cyanobacterium. Formation of sheath was not observed in the medium with mannose, pentoses and organic acids which did not support the heterotrophic growt

ISSN:0233-111X    

DOI:10.1002/jobm.3620270902

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

ISSN:0233-111X    

DOI:10.1002/jobm.3620270904

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

摘要:

AbstractThe synthesis and localization of α‐amylase were studied inBacillus stearothermophilusAN002 at 40, 45, 50 and 55 °C and also during early exponential, late exponential and stationary phases of growth. The extracellular α‐amylase synthesis was highes at 50 °C and at stationary growth phase. Accumulation of intracellular α‐amylase was observed in cells grown at 40 °C and was distributed in all the cell fractions. At 50 and 55 °C the cell did not have α‐amylase in the protoplasm or protoplamic membrane. The synthesis and externalization of extracellular enzyme are two processes and the externalization is controlled by growth temperatu

ISSN:0233-111X    

DOI:10.1002/jobm.3620270905

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

摘要:

AbstractThe strains ofAphanocladium album(isolated from insectsTenebrio molitor) andRhodotorula mucilaginosareduce α,β‐unsaturated ketone groupings in (±)5‐(2′,2′,3′‐trimethy1‐3′‐cyclopenten‐1′‐y1)‐3‐penten‐2‐one, pseudoionone or in its (±) γ,δ‐dihydro‐derivative to respective saturated alcohols.The strains reduce the same carbony1 group to both alcohols in two enantiomeric 3,4‐dihydroderivatives of the first substrate as well as in () hexahydro‐analogue of pseudoionone. For all these substrates, the tra

ISSN:0233-111X    

DOI:10.1002/jobm.3620270906

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

摘要:

AbstractTwo strains of bacteria,Bacillus subtilisT 99 andStreptomycessp. G43, antagonistic to phytopathogenic soil fungi, were isolated from natural substrates.In vitrotests indicated activities against differentFusariumspecies including formae speciales ofFusarium oxysporum, Stromatinia gladioli, Botrytis cinerea, Thanatephorus cucumeris, and other fungi. For both of the antagonists, biotechnical procedures were developed yielding culture broth for large‐scale application. After dilution of these media antagonists were tested successfullyin vivoby soil drenching treatments in a greenhouse carnation production facility. The application forms of the fermentation media developed were capable of suppressing wilt disease ofDianthu

ISSN:0233-111X    

DOI:10.1002/jobm.3620270907

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

ISSN:0233-111X    

DOI:10.1002/jobm.3620270908

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

摘要:

AbstractAfter treatment with ethy1‐methane sulfonate (EMS) mutants ofKluyveromyces marxianusvar,lactisaltered in galactose metabolism were obtained which were further imporoved by genetic recombination. Six types of mutants were detected. In batch culture strains with double mutations — either in galactokinase and uridyltransferase, or in galactokinase and epimerase‐ and which also had a galactose permease transformed lactose to galactose and galactitol. Strains with the same double mutations but no galactose permease completely hydrolyzed lactose to galactose and galactitol under continuous cu

ISSN:0233-111X    

DOI:10.1002/jobm.3620270909

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

摘要:

AbstractThe ability of four strains ofAspergillus parasiticus(IMI 301 001) and two strains ofAspergillus flavus(IMI 300 998) to produce aflatoxins on Nigerian groundnuts under varying conditions of temperature was studied. While all theA. parasiticusstrains produced the four major aflatoxins (B1, B2, G1, G2), only aflatoxin B1, and B2were produced by theA. flavusstrains used. The optimum temperature for aflatoxin production by both the fungal species was 30 °C with no toxin production at 10 °

ISSN:0233-111X    

DOI:10.1002/jobm.3620270910

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

摘要:

AbstractFour known antagonistic microorganisms, namely,Bacillus cereus, Bacillus subtilis, Aspergillus ochraceusandPenicillium cyclopiumwere paired against four pathogens of maize, namely,Curvularia pallescens, Drechslera maydis, Fusarium moniliformeandMacrophomina phaseoliand a pathogen of cassava,Colletotrichum gloeosporioidesf. sp.manihotison potato dextrose agar. The main aim was to test the ability of the antagonists to inhibit the growth of the pathogens. WhereasB. cereusandB. subtilisinhibited the growth ofC. pallescens, D. maydis, M. phaseoliandC. gloeosporioidesf. sp.manihotis, they did not inhibit the growth ofF. moniliforme. A. ochraceusandP. cyclopiumwere effective only againstM. phaseoli.Inhibitory activity on the target organisms are thought to be due to some toxic substances produced by the antagonists.

ISSN:0233-111X    

DOI:10.1002/jobm.3620270911

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY

ISSN:0233-111X    

DOI:10.1002/jobm.3620270913

出版商:Wiley‐VCH    

年代:1987

数据来源: WILEY