An experiment was conducted to investigate the response of periphyton biomass to addition of phosphorus (P) in an aquatic ecosystem dominated by submersed plants. Aquatic ecosystems dominated by Hydrilla verticillata (L.f.) Royle and Vallisneria natans (Lour.) Hara were constructed in mesocosm aquaria. Mesocosms were dosed weekly with different P loads (0 μg/L/Week and 100 μg/L/Week) for 17 wee...

indiscriminate and excessive uses of antibiotics may be lead promote the emergence of antibiotic-resistant microorganisms and side effects in patients. therefore the researchers recently have focused on the use of natural resources, especially medicinal plants. ruta graveolens is a kind of medical plants which contains antifungal and antibacterial components and use in traditional medicine in i...

Mercury at low concentrations represents a major hazard to microorganisms. Inorganic mercury has been reported to produce harmful effects at 5 microg/l in a culture medium. Organomercury compounds can exert the same effect at concentrations 10 times lower than this. The organic forms of mercury are generally more toxic to aquatic organisms and birds than the inorganic forms. Aquatic plants are ...

The distribution of aquatic vegetation and associated community diversity and biomass in the Poyang Lake were investigated. The results showed that (1) 43 species of aquatic vascular plants were found in the Poyang Lake watershed which belonged to 22 families; (2) the vegetation of the Poyang Lake scattered in different areas which could be divided into 31 major plant communities and 5 plant zo...

Aquatic plants have attracted attention in recent years because of the unexpected presence of CAM (e.g. Keeley 1981; Richardson et al. 1984) and C4 (Bowes & Salvucci 1984; Spencer, Wetzel & Teeri 1996; Reiskind et al. 1997; Keeley 1998a) photosynthetic pathways. Indeed, it now appears that the aquatic environment is home to as great a diversity of photosynthetic pathways as terrestrial environm...

Seagrass beds and salt marshes are important in the life histories of many fish, invertebrates, and aquatic birds, such that population size and production of these organisms can be limited by the loss of these habitats. Therefore, restoring seagrass or salt marsh would be expected to benefit species dependent on these resources. Following the ‘North Cape’ oil spill of January 1996 in Rhode Isl...

Extreme natural habitats like halophytes, marsh land, and marine environment are suitable arena for chemical ecology between plants microbes having environmental impact. Endophytes an ecofriendly option the promotion of plant growth to serve as sustainable resource novel bioactive products. The present study, focusing on biodiversity bacterial endophytes from Salicornia brachiata, led isolation...

The present report deals with the pharmacological properties of a series of quaternary tetrahydrobenzylisoquinoline, phenylethylamine and phenanthropyridine alkaloids, isolated from Magnolia and Cocculus plants by Prof. Tomita et al. (1). Marsh et al. (2) reported that some of the quaternary alkaloids isolated from the Cocculus plants showed a considerable curare-like activity. Ogiu and Morita ...

a risk assessment study was conducted to predict the expected hazardous influence on the ecosystem resulted from urbanization and industrialization activities at helwan area, egypt. to achieve these goals, soils, plants and water samples were collected from helwan area, and their total concentrations of inorganic contaminants (cd, cr, co, cu, fe, mn, ni, pb, and zn) and organic pollutants; such...

there are 61 species in 14 families of fish-eating birds in iran. the fish-eating birds of the north of iran belong to 41 species in 10 families which include 67.2 percent of total fish eating bird species and 71% of fish-eating bird’s family of iran. resident birds constitute 13% of the fisheating birds of the caspian sea coasts and the rest are migratory in autumn and winter. there exist 3 ...