The natural occurrence and altitudinal pattern of species with C4 photosynthesis were investigated on Qinghai Plateau, Qinghai province by using stable carbon isotopes in plant leaves and using additional data from references. A total of 58 species belonging to 10 families and 34 genera were identified using C4 photosynthetic pathway, which is only 1.66 % of total 3 500 plant species in Qinghai province. The leading two families, i.e. Gramineae (23 species) and Chenopodiaceae (22 species) contain 77.6 % of all C4 plants in the studied area. The number of C4 species increased from 1 600 to 2 400 m a.s.l. and then decreases quickly till 4 400 m a.s.l. with one half of C4 species distributing from 2 200 to 2 800 m a.s.l. (48 %). Eight plant species were found above 4 000 m a.s.l., but the distribution of these species is limited to the south of Qinghai province (low latitude area) where annual mean temperature is above 0 °C, suggesting that low temperature may generally limit the distribution of C4 plants. and M. C. Li, J. J. Zhu, L. X. Li
Cell membranes of the cyanobacterium Phormidium lamino.sum were separated into two fractions by centrifugation in a stepwise sucrose gradient. One fraction contained mature thylakoid membranes and the other one contained membranes morphologically similar to primary membranes of pea etiochloroplasts. The latter ones represented an electron-transparent base with numerous electron-dense inclusions. The predominant type of the inclusions was rod-like structures containing presumably ribosomes.
Manuscripts from the abandoned library of the Premonstratensian Abbey of St Peter at Weißenau near Ravensburg are currently held in many European and American libraries. After the abbey was secularised in 1802 the library the Counts of von Sternberg-Manderscheid tool possession of it and after 1830 it was incorporated into the Prague palace library of the House of Lobkowicz, with which it was transferred in 1928 to what i snow the National Library of the Czecgh Republic. The manuscript collection of Prague Lobkowicz Library (shelf mark XXIII) contains almost a half of the extant Weißenau collection numbering circa 90 codices. The study delivers the results of systematic research into ownership notes in this file that uncovered fragments of several interesting private libraries of the fifteenth and sixteenth century from the territory of the Constance Diocese.