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X-rays from radiative electron capture of highly-charged heavy ions in an electron cooler (1994)

Liesen, D. ; Beyer, H. F. ; Finlayson, K. D. ; [et al.]

Springer

The European physical journal 30 (1994), S. 307-313

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ISSN: 1434-6079

Keywords: 34.80.Kw ; 32.30.Rj

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The x-ray spectra induced by spontaneous capture of free cooling electrons into bare and hydrogenlike heavy ions have been observed. Au78+, Au79+ and U91+ ions were stored in the storage ring ESR at velocities between 60% and 65% of the velocity of light and the x rays were measured in coincidence with stored particles having captured one electron in the electron cooler. The lines observed can be attributed to the direct transition of cooling electrons into theK shell of the projectile and to the characteristicL →K transitions. The latter are mainly induced by capture into higher shells and subsequent cascade transitions. The measurements are compared to detailed calculations within the framework of presently available theories. Although the relative structure of the measured spectra is in fair agreement with the theoretical prediction, the total charge-changing rate in the electron cooler is about a factor of three smaller than expected.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01426395

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Wirkung eines mikrobiellen Enzympräparates, mit zellwandlytischen Eigenschaften auf Saccharomyces cerevisiae (1990)

Menzel, G. ; Schöps, K. ; Klein, G. ; [et al.]

Berlin : Wiley-Blackwell

Acta Biotechnologica 10 (1990), S. 271-275

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ISSN: 0138-4988

Keywords: Life Sciences ; Life Sciences (general)

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Process Engineering, Biotechnology, Nutrition Technology

Notes: The effect of an enzyme preparation of Streptomyces spec. KT3 was tested in view of its cell wall lytic activity on cells of Saccharomyces cerevisiae. According to electron micrographs under the influence of the enzyme preparation protoplasts but no spheroplasts were formed. The yield of protoplasts amounted dependent on the enzyme charge to 75-99 per cent, most of the protoplasts were released after 60 minutes. Cells of 12 strains of Saccharomyces cerevisiae were able to be protoplasted and stabilized immediately thereafter by mannitol (0.8 M) or KCl (0.6 M). The presence of stabilizers already in the enzyme-containing medium inhibited, however, protoplasting considerably. The stabilized protoplasts could be stored for six days at 4°C without any noticeable changes.

Additional Material: 12 Ill.