BACKGROUND Polygonum chinense Linn. is a common medicinal plant in Southeast Asia and has been used in traditional medicine in Vietnam. The plant contains phytochemicals with various biological properties; however, its antiviral effect has not yet been demonstrated. This study was aimed to evaluate the anti-influenza virus activity of crude extracts of P. chinense, to characterize antiviral met...

The Leptostemonum clade of Solanum contains approximately 350–450 species, including the cultivated eggplant, S. melongena . This clade is characterized by the presence of prickles and apically attenuate anthers. Solanum section Androceras , the focus of this study, is a group of ca. 12 species belonging to the Leptostemonum clade. This section is unusual in the genus because of its mostly nort...

The Dulcamaroid clade of Solanum contains 45 species of mostly vining or weakly scandent species, including the common circumboreal weed Solanum dulcamara L. The group comprises members of the previously recognised infrageneric groupings sect. Andropedas Rusby, sect. Californisolanum A. Child, sect. Dulcamara (Moench) Dumort., sect. Holophylla (G.Don) Walp., sect. Jasminosolanum (Bitter) Seithe...

Finite element technologies have been applied to fluid dynamrcs problems for some time now. The early work focused on Galerkin 's method and various attempts to improve its stability while retaining its basic character. In the late 1970s a new approach was introduced, namely, "stabili zed methods," such as SUPG and Galerkin/least-s quares. These methods have been applied to many areas in fluid ...

1 National Institute of Hydrology and Water Management, 97, Sos. Bucureşti – Ploieşti, Sect. 1, Bucharest cod 013686, Romania 2 National Administration of Meteorology, 97, Sos. Bucureşti – Ploieşti, Sect. 1, Bucharest cod 013686, Romania 3 National Administration “Apele Romane”, 6, Strada Edgar Quinet, sect. 1, Bucharest, cod 010018, Romania 4 UMR Sisyphe-7619, Université Pierre & Marie Curie, ...

The aim of the study was to define the relationship between the concentration of PAHs in sewage sludge at a particular location and their amount in various plant materials growing on it. The credibility of the results is enhanced by the fact that sewage sludge from two separate sewage-treatment plants were selected for their influence on the content of PAHs in three plant species growing on the...

A phylogenetic analysis of Astragalus sect. Alopecuroidei based on nrDNA ITS as well as morphological character data is presented. A total of fifty informative morphological characters were analyzed to reconstruct phylogenetic relationships for 23 taxa of the sect. Alopecuroidei and two species of sect. Laxiflori plus A. sieversianus and A. caryolobus as outgroups. The present analysis revealed...

The Born-Oppenheimer approximation [1] can be used whenever the hamilto..ian of a fast system depends on the coordinates of a slow system . In some textbooks, the problem is solved by freezing the coordinates of the slow system and solving the hamiltonian of the fast system; then the energy of the fast system enters the effective hamiltonian for the slow system as a potential energy term. This ...