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Digitale Medien

The invasive capacity of water chestnut as shown in the management of a natural population in Lago di Candia (1996)

Galanti, G. ; Esposito, A. Topa

Oxford, UK : Blackwell Publishing Ltd

Lakes & reservoirs 2 (1996), S. 0

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ISSN: 1440-1770

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Geographie

Notizen: The growth and production of the annual floating-leaved water chestnut (Trapa natans) were studied during summer 1993 at three sites at Lago di Candia (Northern Italy). These sites were subjected to different levels of harvesting from 1986 to 1992. Site USD was the unharvested control site; site 30S was harvested in alternate years (1987, 1989 and 1991); site 30D was harvested every year from 1986 onwards (except 1989) and moreover was sown during 1990, 1991 and 1992 with 8, 4 and 4 seeds/m2, respectively. Despite differences in seed density in the sediment, reflecting different harvesting and sowing practices, neither the biomass of water chestnut nor the fruit production were statistically different in the three sites although the production of buds, flowers and fertilized ovaries was higher at site 30D. In this site, where the plant density was four times lower, water chestnut increased the number of rosettes per plant two to fourfold. This productivity increased the population's invasive capacity. In Lago di Candia, water chestnut grows to 3 m in depth and it competes successfully with hornwort (Ceratophyllum demersum) in the littoral zone.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1440-1770.1996.tb00045.x

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Digitale Medien

Enhanced prostacyclin production by dipyridamole in man (1981)

Neri Serneri, G. G. ; Masotti, G. ; Poggesi, L. ; [weitere]

Springer

European journal of clinical pharmacology 21 (1981), S. 9-15

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ISSN: 1432-1041

Schlagwort(e): dipyridamole ; prostacyclin ; phosphodiesterase inhibitors ; theophylline ; antiaggregating agents ; ischaemia

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Medizin

Notizen: Summary The effects of some phosphodiesterase (PDE) inhibitors (dipyridamole, theophylline, papaverine and SH-869) on prostacyclin (PGI2) production have been studied in vitro and in vivo. PGI2 was bioassayed by Vane's superfusion technique. In rabbit aortic rings, only dipyridamole in concentrations from 1 to 12 µM was able to stimulate PGI2 biosynthesis in a dose-dependent manner. This effect was also detected with so-called “exhausted” rabbit aortic rings. The other PDE inhibitors used, both in µM and mM concentration, did not affect PGI2 biosynthesis. Dipyridamole was found to increase PGI2 production in healthy volunteers, when given both by infusion (8 µg/kg/min × 2 h) and by oral administration (375 mg/day for seven days). Circulating PGI2 and PGI2 production induced by a 3-min period of ischaemia were increased by an average of 137% (p〈0.001) and 30.8% (p〈0.001) respectively. Saline and theophylline (as aminophylline) infusions used as controls did not affect PGI2 production.