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Articles 91 - 94 of 94
Full-Text Articles in Plant Biology
The Effect Of Antibiotics On Thermophilic Blue-Green Algae, Erleen Blanche Christenson
The Effect Of Antibiotics On Thermophilic Blue-Green Algae, Erleen Blanche Christenson
Dissertations and Theses
The nature of the action of penicillin on the cell walls of bacteria is reviewed. The composition of bacterial cell walls is compared to cell walls of blue-green algae.
The test organisms used were thermophilic: Anacystis nidulans grew optimally at 35⁰C, whereas Synechococcus lividus grew best at 45⁰ C. Growth was recorded by reading optical densities.
Cells of these two thermophilic blue-green algae were treated with varying dosages of penicillin and streptomycin. Penicillin inhibited growth of Anacystis nidulans and Synechococcus lividus in concentrations of 3.0 µg/ml and 0.03 µg/ml respectively. However, when 0.3 µg/ml of penicillin was added to Anacystis …
Legume Inoculants For 1967, W A. Shipton
Legume Inoculants For 1967, W A. Shipton
Journal of the Department of Agriculture, Western Australia, Series 4
PERIODIC changes are made in the strains of rhizobia released for the inoculation of various legume groups.
These changes are made when it is evident from experimental data that better strains of rhizobia are available, or that the old ones are no longer effective.
New strains of rhizobia may give improved nodulation of legume seedlings or increase dry matter yields.
Further Studies On An Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Kenneth D. Mace, Delbert Swartz
Further Studies On An Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Kenneth D. Mace, Delbert Swartz
Journal of the Arkansas Academy of Science
No abstract provided.
Microorganisms And Soil Structure, T. M. Mccalla
Microorganisms And Soil Structure, T. M. Mccalla
Department of Agronomy and Horticulture: Faculty Publications
SUMMARY
Laboratory tests were made to determine the effectiveness of different compounds and microbial groups in increasing the stability of Peorian loess lumps against the action of falling water drops. The influence of these on percolation tests in the laboratory was also determined.
Many organic substances-dextrose, sucrose, starch, peptone, cullulose, and gum arabic-did not themselves contribute directly to soil-structure stability, though these substances do furnish energy material for soil microorganisms, which can convert them readily into either microbial tissue or decomposition products that increase soil-structure stability. Lignin, proteins, oils, fats, waxes, resin, and paraffin increased the stability of lumps of …