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- Andersson, Rolf E.
(författare)
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Microbial lipolysis at low temperatures
- 1980
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Ingår i: Applied and Environmental Microbiology. - 0099-2240 .- 1098-5336. ; 39:1, s. 36-40
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Tidskriftsartikel (refereegranskat)
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| 2. |
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| 3. |
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| 4. |
- Schnürer, Johan, 1957-, et al.
(författare)
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Fluorescein diacetate hydrolysis as a measure of total microbial activity in soil and litter
- 1982
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Ingår i: Applied and Environmental Microbiology. - Washington : American Society for Microbiology. - 0099-2240 .- 1098-5336. ; 43:6, s. 1256-1261
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Tidskriftsartikel (refereegranskat)abstract
- Spectrophotometric determination of the hydrolysis of fluorescein diacetate (FDA) was shown to be a simple, sensitive, and rapid method for determining microbial activity in soil and litter. FDA hydrolysis was studied in soil and straw incubated for up to 3h. Hydrolysis was found to increase linearly with soil addition. FDA hydrolysis by pure cultures of Fusarium culmorum increased linearly with mycelium addition both in shake cultures and after inoculation into sterile soil. FDA hydrolys is by Pseudomonas denitrificans increased linearly with biomass addition. The FDA hydrolytic activities in soil samples from different layers of an agricultural soil were correlated with respiration. Acetone was found to be suitable for terminating the reaction.
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| 5. |
- Blomquist, Göran K., et al.
(författare)
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Separation of fungal propagules by partition in aqueous polymer 2-phase systems
- 1984
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Ingår i: Applied and Environmental Microbiology. - 0099-2240. ; 47:6, s. 1316-1318
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Tidskriftsartikel (refereegranskat)abstract
- Conidia of Penicillium chrysogenum and Penicillium frequentans and sporangiospores of Rhizopus rhizopodiformis, Rhizomucor pusillus, and Mucor racemosus were subjected to partition in aqueous polymer two-phase systems. The partition behavior differed drastically between the conidia of the two Penicillium species and the sporangiospores of the three species of phycomycetes. This difference in partition behavior can be used for purification of fungi belonging to different taxonomical groups. P. frequentans was completely separated from M. racemosus by two extractions, whereas four extractions were needed to purify M. racemosus. This method was used on an air sample from a locality where wood fuel chips are handled. The conidia of the fungi Trichoderma viride and Rhizopus rhizopodiformis were removed completely by only two extractions.
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| 6. |
- Nordgren, Anders, et al.
(författare)
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Microfungi and microbial activity along a heavy-metal gradient
- 1983
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Ingår i: Applied and Environmental Microbiology. - 0099-2240. ; 45:6, s. 1829-1837
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Tidskriftsartikel (refereegranskat)abstract
- Soil fungal biomass, microfungal species composition, and soil respiration rate of conifer mor soil were studied along a steep copper and zinc gradient (up to 20,000 ,ug of Cu and 20,000 ,ug of Zn g-1 dry soil) around a brass mill near the town of Gusum in South Sweden. Fungal biomass and soil respiration rate decreased by about 75% along the metal gradient. Above 1,000 ,ug of Cu g- 1, the decrease was clearly evident; below 1,000 ,ug of Cu g-1, no obvious effects were observed, but there was a tendency for a decrease in total mycelial length. No decrease in CFU was found along the gradient, but fungal species composition was drastically changed. The frequency of the genera Penicillium and Oidiodendron decreased from about 30 and 20%, respectively, at the control sites to only a few percent close to the mill. Mortierella was most frequently isolated in moderately polluted sites, but at the highest pollution levels, a decrease in isolation frequency was evident. Some fungal taxa increased in abundance towards the mill, e.g., Geomyces (from 1 to 10%), Paecilomyces (0 to 10%), and sterile forms (from 10 to 20%). Analyses with a multivariate statistical method (partial least squares) showed that organic matter content and soil moisture had little influence on the fungal community compared with the heavy metal pollution.
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