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Digitale Medien

Novel quantum-electronics phenomena and devices (1982)

Bogner, U. ; Seel, R. ; Graf, F. ; [weitere]

Springer

Applied physics 29 (1982), S. 152-156

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ISSN: 1432-0649

Schlagwort(e): 42.80 ; 42.55

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00688656

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Digitale Medien

Cytochemical localization of ATPase activity in phloem tissues ofRicinus communis (1980)

Browning, A. J. ; Hall, J. L. ; Baker, D. A.

Springer

Protoplasma 104 (1980), S. 55-65

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ISSN: 1615-6102

Schlagwort(e): ATPase cytochemistry ; Phloem ; Ricinus communis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary Standard lead precipitation procedures have been used to examine the localization of ATPase activity in phloem tissues ofRicinus communis. Reaction product was localized on the plasma membrane of the companion cells associated with sieve elements and of parenchyma cells in phloem tissues from the leaf, petiole, stem and root. ATPase activity was also present on the plasma membrane and dispersed P-protein of sieve elements in petiole, stem and root tissue, but was absent from the plasma membrane of these cells in the leaf minor veins. Substitution ofβ-glycerophosphate for ATP produced no change in the localization of reaction product in leaf tissue. These findings are discussed in relation to current theories on the mechanism of sugar transport and phloem loading.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01279368

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Digitale Medien

The validity of the lead precipitation technique for the localization of ATPase activity in plant cells (1980)

Hall, J. L. ; Browning, A. J. ; Harvey, D. M. R.

Springer

Protoplasma 104 (1980), S. 193-200

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ISSN: 1615-6102

Schlagwort(e): Analytical electron microscopy ; ATPase cytochemistry ; Plasma membrane ; Ricinus communis ; Triticum aestivum

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary The claim that osmium-containing deposits which lack lead are frequently and incorrectly interpreted as enzymatic reaction products in lead precipitation techniques for ATPase localization in plants is without foundation. Proper controls clearly demonstrate the enzymatic origin of membrane-located deposits and the presence of lead is confirmed by analytical electron microscopy.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01279767

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