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The effect of high exchangeable potassium percentage on soil properties and plant growth (1975)

Ravina, I. ; Markus, Z.

Springer

Plant and soil 42 (1975), S. 661-672

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ISSN: 1573-5036

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary Within the framework of this study, the influence of high exchangeable potassium percent (EPP) on the physical condition of the soil and on growth is evaluated, assuming the possibility of its improving the structure of the soil. A greenhouse experiment with a grumusol of different levels of EPP was conducted. The soil was irrigated with equilibrium solutions of two levels of total concentrations. Mechanical and physical properties of the different soils were determined. X-ray analysis of the soils was made. The yields and chemical analysis of the plants were determined. The mechnical and physical properties of the different EPP soils were not significantly different. With increasing EPP, there is a change in the c-spacing of the clay, showing that part of the smectites is transformed into a mixed layered clay. A marked rise in the yield with increasing percentage of exchangeable potassium in the soil was found. There is a significant interaction between the exchangeable potassium and the uptake of magnesium and phosphorus, which decreases with increasing EPP. The practical consequences are discussed. re]19740222

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00009950

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Production of Bacillus cereus exopenicillinase on a pilot-plant scale (1965)

Miller, G. ; Bach, G. ; Markus, Z.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 7 (1965), S. 517-528

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: A substrain of Bacillus cereus 569/H produced above 10,000 units of penicillinase/ ml. when grown in a pilot-plant fermentor using a medium containing Casamino acids techn. (Difco) or N-Z-Amine type B (Sheffield), and salts. Simplified purification and concentration procedures give an overall yield of 50-65% enzyme. The freeze-dried enzyme preparation had a good storage stability in vacuumsealed ampules kept at 4, 30, and 37°C. In vials containing air in the head space, partial inactivation occurred in two months at 30 and 37°C. The freezedried preparation showed satisfactory performance in the production of yoghurt fermented milk.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/bit.260070407

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