| a xanthanolide with potent antibacterial activity against methicillin-resistant staphylococcus aureus. | this study was conducted to find constituents of an annual herb, xanthium sibiricum patr er widd, with effective antibacterial activity against methicillin-resistant staphylococcus aureus (mrsa). by monitoring antibacterial activity against mrsa strains, it was shown that a sesquiterpene lactone, identified as [3ar-(3a alpha, 7 beta,8a beta)]-3,3a,4,7,8,8a-hexahydro-7- methyl-3-methylene-6-(3-oxo-1-butenyl)-2h-cyclohepta[b]furan-2-one, or xanthatin, isolated from leaves of the herb, had outstand ... | 1997 | 9364417 |
| epigenetic modulation of endophytic eupenicillium sp. lg41 by a histone deacetylase inhibitor for production of decalin-containing compounds. | an endophytic fungus, eupenicillium sp. lg41, isolated from the chinese medicinal plant xanthium sibiricum, was subjected to epigenetic modulation using an nad(+)-dependent histone deacetylase (hdac) inhibitor, nicotinamide. epigenetic stimulation of the endophyte led to enhanced production of two new decalin-containing compounds, eupenicinicols c and d (3 and 4), along with two biosynthetically related known compounds, eujavanicol a (1) and eupenicinicol a (2). the structures and stereochemistr ... | 2017 | 28333449 |
| bioactive sesquiterpenes and lignans from the fruits of xanthium sibiricum. | seven new sesquiterpenes (1, 3-8), a new sesquiterpene natural product (2), and two new lignans (9 and 10), together with 15 known compounds, were isolated from the fruits of xanthium sibiricum. the structures of the new compounds were established by nmr spectroscopic analysis, ecd calculations, and mo2(oac)4-induced circular dichroism, with the structures of 1 and 4 confirmed by single-crystal x-ray diffraction. compound 1 is the first example of a 3/5/6/5 tetracyclic eudesmane sesquiterpene la ... | 2015 | 26110443 |
| antibacterial secondary metabolites from an endophytic fungus, eupenicillium sp. lg41. | two new compounds containing the decalin moiety, eupenicinicols a and b (1 and 2), two new sirenin derivatives, eupenicisirenins a and b (3 and 4), and four known compounds, (2s)-butylitaconic acid (5), (2s)-hexylitaconic acid (6), xanthomegnin (7), and viridicatumtoxin (8), were isolated from an endophytic fungus, eupenicillium sp. lg41, harbored in the roots of the chinese medicinal plant xanthium sibiricum. their structures were confirmed through combined spectroscopic analysis (nmr and hrms( ... | 2014 | 25356913 |
| a new naphthoquinone and other antibacterial constituents from the roots of xanthium sibiricum. | reinvestigating the chemical constituents of the roots of xanthium sibiricum led to the isolation of a new naphthoquinone (1), together with 13 known compounds (2-14). their structures were elucidated by using spectroscopic analyses, including hr-esi-ms, 1d and 2d nmr, and by comparing their nmr data with those of related compounds. compound 1 showed moderate antibacterial activity against escherichia coli, bacillus subtilis, micrococcus tetragenus and staphylococcus aureus, while 6 and 12 showe ... | 2015 | 25482477 |
| actinophytocola xanthii sp. nov., a novel actinomycete isolated from rhizosphere soil of the plant xanthium sibiricum. | a novel actinomycete strain, 11-183t, was isolated from the rhizosphere soil of xanthium sibiricum, which was collected in tangshan, hebei, china. a phylogenetic analysis based on 16s rrna gene sequences showed that strain 11-183t formed a clade within the genus actinophytocola, with a maximum similarity of 98.44 % to actinophytocola xinjiangensis qaiii60t, followed by 97.76 % similarity to actinophytocola sediminis yim m13705t(97.76%). the average nucleotide identity and digital dna-dna hybridi ... | 2017 | 28073395 |
| plant soaking decomposition as well as nitrogen and phosphorous release in the water-level fluctuation zone of the three gorges reservoir. | the operating scheme of the three gorges reservoir results in a summer drought in the water-level fluctuation zone during which plants grow vigorously. in the winter inundation season, soaking plants may decompose and release nutrients resulting in water quality deterioration. this study quantifies the contributions of the underwater decomposition of nine dominant plant species in the water-level fluctuation zone to nutrient release. the in-situ litterbag technique was used to study for soaking ... | 2017 | 28325595 |
| [allelopathy of different plants on wheat, cucumber and radish seedlings]. | by means of bioassay in laboratory and field, this paper studied the allelopathy of 18 kinds of plants in gansu province on the seedlings of wheat, cucumber and radish. the results showed that the aqueous extract of the stems and leaves of artemisia annua, solanum nigrum and datura stramonium had the strongest allelopathy on test receptor plants, and their synthetic inhibitory effect (se) was 47.66%, 32.89% and 26.63%, respectively. the se of xanthium sibiricum, portulaca oleraca, cephalanoplos ... | 2005 | 16011179 |
| muscle spasm associated with therapeutic use of cang er zi wan. | cang er zi wan (cezw) is a herbal medication derived from xanthium sibiricum that is used to treat allergies and upper respiratory problems. its toxicity has been described in grazing animals, in experimental studies, and in human overdoses. we describe a case of muscular spasm that was associated with the therapeutic use of cezw. | 2010 | 20521353 |
| secondary succession and its effects on soil moisture and nutrition in abandoned old-fields of hilly region of loess plateau, china. | floristic composition, community structure and soil moisture and nutrient contents in abandoned fields of different ages were analyzed to clarify the regenerative aspects of succession as a tool for vegetation restoration. the results indicated that secondary succession in this region can be interpreted as an auto-succession: there are main changes in species-relative abundance and species turnover. annual or biennial species (e.g. artemisia scoparia), acted as pioneers and strongly dominated th ... | 2007 | 17499978 |
| [photosynthetic characteristics and coenological survey of lactuca serriola in its invaded area]. | lactuca serriola, a national class quarantine object, is a new invasive species in the coastal area of southeast china. the coenological survey showed that because of its big individual, l. serriola could easily form dominant population in its invaded area, and its main accompany species were conyza canadensis, c. bonarinisis, bidentis bipinnata, oenothera laciniata, ipomoea hederacea, setaria viridis, daucus carota, xanthium sibiricum, erigeron annuus, l. indica, humulus scandens, solanum nigru ... | 2006 | 17330472 |