| [antimutagenicity screening of water extracts from 102 kinds of chinese medicinal herbs]. | our observation shows that out of 102 kinds of chinese medicinal herbs tested, 17 have remarkable antimutagenic effect on the mutation induced by aflatoxin b1, in ames test. among the 17 herbs glycyrrhiza uralensis, bupleurm chinense, portulaca grandiflora and cnidium monnieri have been found in other tests to be effective against mutagenesis induced by cyclophosphamide in mice. | 1990 | 2268399 |
| analyzing the light energy distribution in the photosynthetic apparatus of c4 plants using highly purified mesophyll and bundle-sheath thylakoids. | the chlorophyll fluorescence characteristics of mesophyll and bundle-sheath thylakoids from plant species with the c4 dicarboxylic acid pathway of photosynthesis were investigated using flow cytometry. ten species with the nadp-malic enzyme (nadp-me) biochemical type of c4 photosynthesis were tested: digitaria sanguinalis (l.) scop., euphorbia maculata l., portulaca grandiflora hooker, saccharum officinarum l., setaria viridis (l.) beauv., zea mays l., and four species of the genus flaveria. thi ... | 1996 | 12226432 |
| the requirement for sodium as a micronutrient by species having the c(4) dicarboxylic photosynthetic pathway. | six species having characteristics of plants with the c(4) dicarboxylic photosynthetic pathway, echinochloa utilis l. ohwi et yabuno (japanese millet), cynodon dactylon l. (bermuda grass), kyllinga brevifolia rottb., amaranthus tricolor l. cv. early splendour, kochia childsii hort., and portulaca grandiflora hook (rose moss), responded decisively to 0.1 milliequivalent per liter nacl supplied to their culture solutions initially containing less than 0.08 microequivalent per liter na. chlorosis a ... | 1972 | 16658050 |
| purification by immunoadsorption and immunochemical properties of nadp-dependent malic enzymes from leaves of c(3), c(4), and crassulacean acid metabolism plants. | nadp:malic enzyme from corn (zea mays l.) leaves was purified by conventional techniques to apparent homogeneity as judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. antibodies raised against this protein in rabbits were purified, coupled covalently to protein a-sepharose cl-4b, and used as an immunoaffinity resin to purify the nadp:malic enzymes of the c(3) plants spinach (spinacia oleracea l.) and wheat (triticum aestivum l.), of the crassulacean acid metabolism (cam) plant ... | 1990 | 16667339 |
| characterization and functional identification of a novel plant 4,5-extradiol dioxygenase involved in betalain pigment biosynthesis in portulaca grandiflora. | betalains are pigments that replace anthocyanins in the majority of families of the plant order caryophyllales. betalamic acid is the common chromophore of betalains. the key enzyme of the betalain biosynthetic pathway is an extradiol dioxygenase that opens the cyclic ring of dihydroxy-phenylalanine (dopa) between carbons 4 and 5, thus producing an unstable seco-dopa that rearranges nonenzymatically to betalamic acid. a gene for a 4,5-dopa-dioxygenase has already been isolated from the fungus am ... | 2004 | 14730069 |
| phytoremediation of textile dyes and effluents: current scenario and future prospects. | phytoremediation has emerged as a green, passive, solar energy driven and cost effective approach for environmental cleanup when compared to physico-chemical and even other biological methods. textile dyes and effluents are condemned as one of the worst polluters of our precious water bodies and soils. they are well known mutagenic, carcinogenic, allergic and cytotoxic agents posing threats to all life forms. plant based treatment of textile dyes is relatively new and hitherto has remained an un ... | 2015 | 26386310 |
| characterization of alternanthera mosaic virus and its coat protein. | a new isolate of alternantheramosaic virus (altmv-mu) was purified from portulaca grandiflora plants. it has been shown that the altmv-mu coat protein (cp) can be efficiently reassembled in vitro under different conditions into helical rna-free virus-like particles (vlps) antigenically related to native virus. the altmv-mu and vlps were examined by atomic force and transmission electron microscopies. the encapsidated altmv-mu rna is nontranslatable in vitro. however, it can be translationally ac ... | 2011 | 22216073 |
| the complete nucleotide sequence of alternanthera mosaic virus infecting portulaca grandiflora represents a new strain distinct from phlox isolates. | a southeastern european isolate of alternanthera mosaic virus (altmv-mu) of the genus potexvirus (family flexiviridae) was purified from the ornamental plant portulaca grandiflora. the complete nucleotide sequence (6606 nucleotides) of altmv-mu genomic rna was defined. the altmv-mu genome is different from those of all isolates described earlier and is most closely related to genomes of partly sequenced portulaca isolates altmv-po (america) and altmv-it (italy). phylogenetic analysis supports th ... | 2010 | 21127957 |
| is the flower fluorescence relevant in biocommunication? | flower fluorescence has been previously proposed as a potential visual signal to attract pollinators. in this work, this point was addressed by quantitatively measuring the fluorescence quantum yield (φ(f)) for flowers of bellis perennis (white, yellow, pink, and purple), ornithogalum thyrsoides (petals and ovaries), limonium sinuatum (white and yellow), lampranthus productus (yellow), petunia nyctaginiflora (white), bougainvillea spectabilis (white and yellow), antirrhinum majus (white and yell ... | 2010 | 20811871 |
| agrobacterium-mediated transformation of large-flowered purslane (portulaca grandiflora h.). | transformation of portulaca grandiflora has been developed with agrobacterium tumefaciens strains a281 and t1272. transformation was assessed by the following criteria: selection of hormone independent callus, antibiotic-resistant callus, and transgenic antibiotic-resistant plants. in addition, dna hybridization analysis demonstrated that the dna from tumor lines contained sequences homologous to binary vector t-dna of strain a281. following transformation with strain t1272, segregation analysis ... | 1995 | 18470202 |
| identification and full sequence of an isolate of alternanthera mosaic potexvirus infecting phlox stolonifera. | a potexvirus was isolated from creeping phlox (phlox stolonifera) plants from a commercial nursery in pennsylvania. the virus was serologically related to clover yellow mosaic virus, plantain virus x, potato virus x, and potato aucuba mosaic virus, and was most closely related to papaya mosaic virus (papmv). the sequence of a pcr fragment obtained with potexvirus group-specific primers was distinct from that of papmv; the coat protein (cp) gene and 3' untranslated region (utr) were closely relat ... | 2006 | 16211329 |
| chronic toxicity study of portulaca grandiflora hook. | we investigated the toxic effects of portulaca grandiflora aqueous extract given to male and female wistar rats for 6 months. the rats were divided into five groups of each sex that were control groups, three experimental groups and recovery groups. the control groups received 5 ml of distilled water/kg per day. the experimental groups were orally given the water extract of portulaca grandiflora at doses of 10, 100 and 1000 mg/kg per day. the recovery groups received 1000 mg/kg per day for 6 mon ... | 2004 | 15013204 |
| [anti-hbsag herbs employing elisa technique]. | with the aid of the elisa system this schema represented a laboratory approach to the recognition of anti-hbsag capability of herbs by using 300 herbal extracts. altogether 10 herbs (3.0%) were identified as effective. when forming a multiplex plan by employing 10 average p/n ratios as exemplified by 5 varying doses of herb (0.3, 0.6, 1.2, 2.5, 5.0 mg/100 microliters), 2 varying concentrations of hbsag (10.92, 14.26 p/n ratio), and 3 varying contact time periods (immediate, 1h, 2h) for the compr ... | 1990 | 2268945 |
| is rna editing implicated in group ii intron survival in the angiosperm mitochondrial genome? | introns may be considered as optional because they are removed from mrna molecules, but introns are fairly preserved for unknown reasons. previously, the mitochondrial rps3 gene of sugar beet ( beta vulgaris l., caryophyllales) was shown to represent a unique example of an intron loss. we have determined the distribution of the rps3 intron in 19 caryophyllalean species. the intron was absent from the amaranthaceae and the achatocarpaceae. in the caryophyllaceae, dianthus japonicus rps3 was pseud ... | 2012 | 22224446 |
| betalain production is possible in anthocyanin-producing plant species given the presence of dopa-dioxygenase and l-dopa. | carotenoids and anthocyanins are the predominant non-chlorophyll pigments in plants. however, certain families within the order caryophyllales produce another class of pigments, the betalains, instead of anthocyanins. the occurrence of betalains and anthocyanins is mutually exclusive. betalains are divided into two classes, the betaxanthins and betacyanins, which produce yellow to orange or violet colours, respectively. in this article we show betalain production in species that normally produce ... | 2012 | 22409631 |