Publications
| Title | Abstract | Year(sorted descending) Filter | PMID Filter |
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| effects of bidens pilosa l. var. radiata scherff treated with enzyme on histamine-induced contraction of guinea pig ileum and on histamine release from mast cells. | the medical mechanism against type i allergies is to block the release or production of chemical mediators from mast cells or to block the h(1)-receptor signaling. we previously reported that the anti-allergic action of the dry powder from bidens pilosa l. var. radiata scherff treated with the enzyme cellulosine (emmbp) was dependent on the inhibition of histamine release from mast cells. here, we investigate that the effect of fractions in emmbp on the histamine-induced contraction in guinea pi ... | 2009 | 19602852 |
| [observation on therapeutic effect of runmushu oral liquid in treating xerophthalmia in postmenopausal women]. | to objectively evaluate the therapeutic effect and safety of runmushu oral liquid (rms) for the treatment of xerophthalmia in postmenopausal women. | 2009 | 19852302 |
| joint effects of arsenic and cadmium on plant growth and metal bioaccumulation: a potential cd-hyperaccumulator and as-excluder bidens pilosa l. | joint effects of arsenic (as) and cadmium (cd) on the growth of bidens pilosa l. and its uptake and accumulation of as and cd were investigated using the field pot-culture experiment. the results showed that single cd (<or=25 mg kg(-1)) and as (<or=50 mg kg(-1)) treatments could promote the growth of b. pilosa, resulting in 34.5-104.4% and 21.0-43.0%, respectively, increase in the dry biomass of shoots while compared with that under the control conditions. however, under the co-contamination of ... | 2009 | 19070954 |
| cadmium tolerance and accumulation characteristics of bidens pilosa l. as a potential cd-hyperaccumulator. | recently, researchers are becoming interested in using hyperaccumulators for decontamination of heavy metal polluted soils, whereas few species that hyperaccumulate cadmium (cd) has been identified in the plant kingdom. in this study, the physiological mechanisms at the seedling stage and growth responses and cd uptake and accumulation at flowering and mature stages of bidens pilosa l. under cd treatments were investigated. at the seedling stage, when soil cd was lower than 16mgkg(-1), the plant ... | 2009 | 18513866 |
| differential growth response to arbuscular mycorrhizal fungi and plant density in two wild plants belonging to contrasting functional types. | the effect of arbuscular mycorrhizal fungi (amf) on plant growth was examined in two wild plant species belonging to contrasting functional types: an annual forb (bidens pilosa, asteraceae) and a deciduous shrub (acacia caven, fabaceae) at three contrasting plant densities (one, two, and three individuals per pot). amf had a slightly negative effect on b. pilosa when the species grew in isolation while they positively affected a. caven. positive effects of amf on shoot mass of a. caven decreased ... | 2009 | 19444488 |
| [characteristics of cadmium tolerance and bioaccumulation of bidens pilosa l. seedlings]. | bidens pilosa l. has been identified as a newly found cd-hyperaccumulator. in the present study, the characteristics of its cd tolerance (growth response and physiological and biochemical characteristics) and accumulation were examined. the results showed that low cd treatments (< or =32 mg/kg) could enhance plant growth, the dry biomass of shoot and root increased by 32.4%-44.7% and 29.1%-57.6%, respectively, at cd concentrations 8-32 mg/kg when compared with the control. the shoot dry biomass ... | 2009 | 19968126 |
| rwandan female genital modification: elongation of the labia minora and the use of local botanical species. | the elongation of the labia minora is classified as a type iv female genital mutilation by the world health organization. however, the term mutilation carries with it powerful negative connotations. in rwanda, the elongation of the labia minora and the use of botanicals to do so is meant to increase male and female pleasure. women regard these practices as a positive force in their lives. this paper aims to assess whether rwandan vaginal practices should indeed be considered a form of female gen ... | 2008 | 18247211 |
| [hyperaccumulative characteristics of 7 widely distributing weed species in composite family especially bidens pilosa to heavy metals]. | hyperaccumulator is the main point of phytoremediating contaminated soils by heavy metals, and the identification of hyperaccumulator is still the difficult and key step of phytoremediation. the outdoor pot-culture experiment was used to study the hyperaccumulative characteristics of 7 widely distributing weed species in northeast of china to heavy metals. the results in screening experiment showed that taraxacum mongolicum and bidens pilosa indicated strong tolerance to cd single and cd-pb-cu-z ... | 2008 | 19143394 |
| bidens identification using the noncoding regions of chloroplast genome and nuclear ribosomal dna. | bidens pilosa l. is a plant producing barbed fruits which, due to its method of seed dispersal, is commonly found during forensic investigations. in taiwan there are three varieties of the species, radiata, minor and pilosa. fragments of these three varieties are difficult to differentiate by traditional morphological characteristics and until now little is known of their genetic composition. to discover genetic polymorphisms among these varieties, five loci within the nuclear and chloroplast ge ... | 2008 | 19083787 |
| in vitro study of mutagenic potential of bidens pilosa linné and mikania glomerata sprengel using the comet and micronucleus assays. | teas of bidens pilosa and mikania glomerata are popularly consumed to medicinal ends. the capacity to induce dna damages and mutagenic effects of these teas were evaluated, in vitro, on htc cells, with comet assay and micronucleus test. the teas tested at various doses were prepared differently: infusion of mikania glomerata (im) and bidens pilosa (ib), macerate of mikania glomerata in 80% ethanol (mm80) and decoction of bidens pilosa (db). in im and mm80, the quantity of coumarin was determined ... | 2008 | 18485638 |
| study of the antitumor potential of bidens pilosa (asteraceae) used in brazilian folk medicine. | bidens pilosa (l.) (asteraceae) is a medicinal plant traditionally used in brazil for treating conditions that can be related to cancer. therefore the present study was carried out to evaluate the antitumor activity of extracts obtained from the aerial parts of this plant species. | 2008 | 18342465 |
| bidens pilosa l. exhibits high sensitivity to coumarin in comparison with three other weed species. | nine natural plant compounds were screened for phytotoxicity to bidens pilosa l. a troublesome weed in field and plantation crops. the sensitivity of three other weed species to coumarin, the most active identified compound, was also evaluated. coumarin, at a concentration of 500 microm, had little effect on germination and growth of senna obtusifolia l., euphorbia heterophylla l., and ipomoea grandifolia l. when compared with its effects on b. pilosa l. in a concentration range of 10-100 microm ... | 2008 | 18338136 |
| clinical and biochemical effects of a combination botanical product (clearguard) for allergy: a pilot randomized double-blind placebo-controlled trial. | botanical products are frequently used for treatment of nasal allergy. three of these substances, cinnamomum zeylanicum, malpighia glabra, and bidens pilosa, have been shown to have a number of anti-allergic properties in-vitro. the current study was conducted to determine the effects of these combined ingredients upon the nasal response to allergen challenge in patients with seasonal allergic rhinitis. | 2008 | 18625073 |
| protective effects of total flavonoids of bidens pilosa l. (tfb) on animal liver injury and liver fibrosis. | the hepatoprotective effects of total flavonoids of bidens pilosa l. (tfb), a traditional chinese medicine were evaluated in carbon tetrachloride (ccl(4))-induced liver injury in mice and rats. total flavonoids of bidens pilosa l. (25, 50 and 100mg/kg) were administered via gavage daily for 10 days to ccl(4)-treated mice as well as tfb (30, 60 and 90mg/kg) administered for 6 weeks to ccl(4)-treated rats. liver index (liver weight/body weight), serum levels of transaminases (alanine aminotransfer ... | 2008 | 18313245 |
| joyce after flaubert: the cuckold as imperfect physician, the writer as physiologist. | although joyce was not as familiar with the practice and theory of medicine as was gustave flaubert, this article argues that, through flaubert's legacy, joyce's writing was influenced by the french school of medical thought. several aspects of flaubert's style and narration-what has been dubbed his "medical realism"-were taken up by joyce: the artist's impersonal perspective, the precision of descriptions, and the materialist attack against romanticism, as well as the irony built into the narra ... | 2008 | 20836269 |
| in vivo and in vitro effects of bidens pilosa l. (asteraceae) leaf aqueous and ethanol extracts on primed-oestrogenized rat uterine muscle. | bidens pilosa l. is an asteraceae growing in tropical zones, and traditionally utilized worldwide in herbal medicine. the present work is based on its traditional use during child birth as a labour facilitator. in vivo tests of acute toxicity showed a weak toxic effect for both extracts but the toxicity of the ethanol extract (ld(50)=6.15 g/kg) was upper than that of the aqueous extract (ld(50)=12.30 g/kg). the three-days uterotrophic assay on immature mice showed body weight gain followed by a ... | 2007 | 20162059 |
| cytopiloyne, a novel polyacetylenic glucoside from bidens pilosa, functions as a t helper cell modulator. | an extract of bidens pilosa, an anti-diabetic asteraceae plant, has recently been reported to modulate t cell differentiation and prevent the development of non-obese diabetes (nod) in nod mice. in this paper, a novel bioactive polyacetylenic glucoside, cytopiloyne (1), was identified from the bidens pilosa extract using ex vivo t cell differentiation assays based on a bioactivity-guided fractionation and isolation procedure. its structure was elucidated as 2beta-d-glucopyranosyloxy-1-hydroxytri ... | 2007 | 17101254 |
| cytopiloyne, a polyacetylenic glucoside, prevents type 1 diabetes in nonobese diabetic mice. | some polyacetylenes from the plant bidens pilosa have been reported to treat diabetes. in this study, we report that the cytopiloyne from b. pilosa, which is structurally different from the above-mentioned polyacetylenes and inhibits cd4(+) t cell proliferation, effectively prevents the development of diabetes in nonobese diabetic mice as evidenced by a normal level of blood glucose and insulin and normal pancreatic islet architecture. cytopiloyne also suppresses the differentiation of type 1 th ... | 2007 | 17513748 |
| a novel polyacetylene significantly inhibits angiogenesis and promotes apoptosis in human endothelial cells through activation of the cdk inhibitors and caspase-7. | a novel bioactive polyacetylene compound, 1,2-dihydroxy-5(e)-tridecene-7,9,11-triyne (compound 1), was identified from the bidens pilosa extract using an ex vivo primary human umbilical vein endothelium cell (huvec) bioassay-guided fractionation protocol. our results demonstrate that compound 1 (at 2.5 microg/ml) possessed significant anti-angiogenic effects, as manifested by an inhibition of huvec proliferation, migration, and the formation of tube-like structures in collagen gel. moreover, com ... | 2007 | 17559025 |
| sticktight flea (echidnophaga gallinacea) infestation in a victoria crowned pigeon (goura victoria). | a 12-yr-old female victoria crowned pigeon (goura victoria), acquired from a private aviculturalist, was diagnosed with a flea infestation during a quarantine examination. the fleas were embedded around the face and throat and were identified as sticktight fleas (echidnophaga gallinacea). despite the sticktight fleas' worldwide distribution and broad host range, there is a paucity of reports on flea infestations and their treatment in zoo and exotic pet birds. although this parasite has the pote ... | 2007 | 18229869 |
| phytotoxicity of volatile oil from eucalyptus citriodora against some weedy species. | a study was undertaken to explore the phytotoxicity of volatile essential oil from eucalyptus citriodora hook. against some weeds viz. bidens pilosa, amaranthus viridis, rumex nepalensis, and leucaena leucocephala in order to assess its herbicidal activity. dose-response studies conducted under laboratory conditions revealed that eucalypt oils (in concentration ranging from 0.0012 to 0.06%) greatly suppress the germination and seedling height of test weeds. at 0.06% eucalypt oil concentration, n ... | 2007 | 17717987 |
| allelopathy on bark of downed logs of chamaecyparis obtusa sieb. and zucc. var. formosana (hayata) rehder. | chamaecyparis obtusa sieb. and zucc. var. formosana (hayata) rehder is the dominant species in the temperate forest of yuanyang lake nature reserve (yyl), taiwan. although downed logs of c. obstusa var. formosana occupy only a small percentage of the forest floor area in yyl, they are important regeneration substrates. seedlings of this species often grow without competition on the new downed logs, and a few broadleaf trees grow with them. we hypothesized that the bark of the newly fallen logs p ... | 2007 | 17476467 |
| flavonoids, centaurein and centaureidin, from bidens pilosa, stimulate ifn-gamma expression. | bidens pilosa is used as an ethnical medicine for bacterial infection or immune modulation in asia, america and africa. here, we employed an ifn-gamma promoter-driven luciferase reporter construct and t cells to characterize immunomodulatory compounds from this plant based on a bioactivity-guided isolation principle. we found that pha, a positive control, caused a six-fold increase in ifn-gamma promoter activity. in contrast, hot water crude extracts from bidens pilosa and its butanol subfractio ... | 2007 | 17408892 |
| [toxicity of pesticides used in chrysanthemum crops to eggs and nymphs of orius insidiosus (say) (hemiptera: anthocoridae)]. | the objective of this study was to evaluate the toxicity of some pesticides used in chrysanthemum crops to eggs and nymphs of orius insidiosus (say). the bioassays were carried out at 25 +/- 2 degrees c, 70 +/- 10% rh and 12h photophase. for the tests with eggs, stems of bidens pilosa l. previously exposed to predator oviposition were dipped for five seconds in aqueous dilution of the pesticides, using 40 eggs per treatment. the pesticides were applied on nymphs using a potter's tower. forty fir ... | 2007 | 17352073 |
| influence of photoperiod on orius thyestes herring (hemiptera: anthocoridae) reproduction and longevity. | several species of orius wolff are used in biological control of thrips in protected cultivations in temperate regions, but some of them show reproductive diapause, compromising the efficiency of these agents of biological control. there are no reports on the biology of the neotropical species orius thyestes herring under different environmental conditions. the purpose of this work was to investigate the influence of photoperiod on reproduction and longevity of this predator. nymphs were kept in ... | 2006 | 17061797 |
| [psychoanalytic observations on f. crommelynck's book the magnificent cuckold]. | 2006 | 13528225 | |
| first records of two mealybug species in brazil and new potential pests of papaya and coffee. | five mealybug (hemiptera: pseudococcidae) plant pest species: dysmicoccus grassii (leonardi), ferrisia malvastra (mcdaniel), ferrisia virgata (cockerell), phenacoccus tucumanus granara de willink, and pseudococcus elisae borchsenius are recorded for the first time in the state of espírito santo, brazil. these are the first records of d. grassii in brazil, from papaya (carica papaya, caricaceae), and from coffee (coffea canephora, rubiaceae). ferrisia malvastra is also newly recorded in brazil, w ... | 2006 | 19537975 |
| screening for antimicrobial activity of ten medicinal plants used in colombian folkloric medicine: a possible alternative in the treatment of non-nosocomial infections. | the antimicrobial activity and minimal inhibitory concentration (mic) of the extracts of bidens pilosa l., bixa orellana l., cecropia peltata l., cinchona officinalis l., gliricidia sepium h.b. & k, jacaranda mimosifolia d.don, justicia secunda vahl., piper pulchrum c.dc, p. paniculata l. and spilanthes americana hieron were evaluated against five bacteria (staphylococcus aureus, streptococcus beta hemolític, bacillus cereus, pseudomonas aeruginosa, and escherichia coli), and one yeast (candida ... | 2006 | 16483385 |
| studies of anticancer and antipyretic activity of bidens pilosa whole plant. | screening of different extracts and fractions from the plant bidens pilosa linn. var. (asteraceae) has been conducted using the in-vitro comet assay for anticancer and the antipyretic action, which was done with in-vivo models. the extract from whole plant was extracted with n-hexane, chloroform and methanol extract (e1 - e3). the extracts were fractioned by column chromatography method and fractioned with ethyl acetate, acetone and water (f1 - f3). all the extracts and fractions were tested for ... | 2006 | 16615823 |
| ethnomedicines used in trinidad and tobago for urinary problems and diabetes mellitus. | this paper is based on ethnobotanical interviews conducted from 1996-2000 in trinidad and tobago with thirty male and female respondents. | 2006 | 17040567 |
| bidens pilosa suppresses interleukin-1beta-induced cyclooxygenase-2 expression through the inhibition of mitogen activated protein kinases phosphorylation in normal human dermal fibroblasts. | bidens pilosa (bp) linn. var. radiata is a plant used in traditional folk medicine. it is clinically effective in various diseases; the pathogenesis of most of these involves cyclooxygenase (cox)-2. to investigate the mechanism on which the clinical effectiveness of bp is based, we examined its effects on cox-2 expression and its major product, prostaglandin (pg)e(2), under conditions of inflammation. we induced inflammation in normal human dermal fibroblasts with interleukin (il)-1beta and exam ... | 2006 | 17040496 |
| an introduced generalist parasite, the sticktight flea (echidnophaga gallinacea), and its pathology in the threatened florida scrub-jay (aphelocoma coerulescens). | the sticktight flea, (echidnophaga gallinacea), a major pest of the domestic chicken (gallus gallus) that can cause severe pathology or death if untreated, is rarely recorded in free-living avian species. sticktight fleas, however, were observed on the federally threatened florida scrub-jay (aphelocoma coerulescens) in february 2004, in south central florida. of the 81 florida scrub-jays (fsjs) sampled before the 2004 breeding season, 12 were infested, with from 1 to as many as 57 fleas. subsequ ... | 2006 | 17152932 |
| protection from oxidative damage using bidens pilosa extracts in normal human erythrocytes. | bidens pilosa (b. pilosa) is well known in taiwan as a traditional chinese medicine. the purpose of this study was to evaluate the ability of both the ethanol (etoh) and ethylacetate/ethanol (ea/etoh) extracts from the whole b. pilosa plant, to protect normal human erythrocytes against oxidative damage in vitro. it was determined that the oxidative hemolysis and lipid/protein peroxidation of erythrocytes induced by the aqueous peroxyl radical [2,2'-azobis(2-amidinopropane) dihydrochloride (aaph) ... | 2006 | 16765500 |
| population dynamics of weeds in no-tillage and conventional crop systems. | population dynamics of weeds in successive maize and bean crops were evaluated in two soil management systems (conventional and no-tillage), for two maize applications (grain and silage), and in four consecutive growing seasons. every year, conventional tillage consisted in plowing and harrowing before sowing. in no-tillage, chemical weed desiccation was made with the mixture glyphosate + 2.4-d. to control weeds, the mixture fluazifop-p-butil + fomesafen was applied on the bean crop in all the p ... | 2005 | 15656169 |
| effects of hand weeding strip and nitrogen fertilizer on corn plants. | the objective of the present research was to evaluate effects of different strip weed control associated with nitrogen fertilizer on corn applied after planting. the experiment was set and conducted in botucatu, são paulo state, brazil, and the hybrid planted was dekalb 333-b. a completely randomized block design with four replications was used. experimental plots were disposed as a factorial scheme 2 x 2 x 4, constituted by two types of weeding on row (with or without manual hoeing), two types ... | 2005 | 15656170 |
| influence of type and amount of straw cover on weed emergence. | this research was undertaken during 2003-2004 growing season to evaluate the effects of type [forage sorghum "hybrid cober exp" (sorghum bicolor x sorghum sudanense), forage millet (pennisetum americanum "var. bn2"), finger millet (eleusine coracana), and st lucia grass (brachiaria brizantha)] and amount of straw cover (5.5 and 3.0 t ha(-1)) upon the emergence of bidens pilosa, chamaesyce spp., amaranthus spp., and commelina benghalensis, under field conditions of the brazilian cerrado, in the r ... | 2005 | 15656176 |
| the distinct effects of a butanol fraction of bidens pilosa plant extract on the development of th1-mediated diabetes and th2-mediated airway inflammation in mice. | bidens pilosa is claimed to be useful for immune or anti-inflammatory disorders; however, little scientific evidence has been published concerning its function. in this paper, immune disease mouse models were used to study the function of a butanol fraction of b.pilosa. we demonstrated treatment with the butanol fraction of b.pilosa ameliorated th1 cell-mediated autoimmune diabetes in nonobese diabetic (nod) mice but caused deterioration of th2 cell-mediated airway inflammation induced by ovalbu ... | 2005 | 15864741 |
| fleas parasitizing domestic dogs in georgia, usa: species composition and seasonal abundance. | monthly flea collections were made from domestic dogs in bulloch county, georgia, usa from september 1996 to august 2004. a total of 2518 fleas belonging to 8 species were collected. the most common flea was the cat flea, ctenocephalides felis (389 males and 1148 females), followed by the dog flea, ctenocephalides canis (250 males and 285 females), a generalist/carnivore flea, pulex simulans (106 males and 213 females), and a sticktight flea, echidnophaga gallinacea (3 males and 89 females). sma ... | 2005 | 15893082 |
| relaxant effects of the neutral extract of the leaves of bidens pilosa linn on isolated rat vascular smooth muscle. | the long-lasting antihypertensive effect of a neutral extract of bidens pilosa has been suggested to be due to vasodilation. the present work was undertaken to assess this hypothesis. the vasorelaxant effect of a neutral extract (nbp) of the leaves of b. pilosa was evaluated in vitro on isolated rat aorta contracted with kcl or norepinephrine. nbp induced a concentration-dependent vasorelaxation of the rat aorta precontracted with kcl (60 mm) by 25%-105% at the respective concentrations of 0.25- ... | 2005 | 15934016 |
| ethyl caffeate suppresses nf-kappab activation and its downstream inflammatory mediators, inos, cox-2, and pge2 in vitro or in mouse skin. | ethyl caffeate, a natural phenolic compound, was isolated from bidens pilosa, a medicinal plant popularly used for treating certain inflammatory syndromes. the purpose of this study was to investigate the structural activity, and the anti-inflammatory functions and mechanism(s) of ethyl caffeate. ethyl caffeate was found to markedly suppress the lipopolysaccharide (lps)-induced nitric oxide (no) production (ic(50) = 5.5 microg ml(-1)), mrna and protein expressions of inducible nitric oxide synth ... | 2005 | 16041399 |
| low allozymic variation in the bidens pilosa l. complex (asteraceae). | bidens alba, b. subalternans, and b. pilosa form a complex group based on their morphological similarities. bidens pilosa l. and b. subalternans dc. are herbs with a wide distribution in agricultural and disturbed areas. bidens alba (l.) dc. varies in size from herb to subshrub and has a coastal distribution. enzyme electrophoresis was used to evaluate genetic diversity in 12 populations of bidens. all but three loci (lap-1, est, and got) were monomorphic. est-1 and got were polymorphic only in ... | 2005 | 16187159 |
| differential effects of 11-ketotestosterone on dimorphic traits in a teleost with alternative male reproductive morphs. | species with dimorphic males typically have one morph (type i) associated with territoriality and courtship, and another morph (type ii) associated with cuckoldry. in teleost fishes, type i males generally have higher levels of the androgen 11-ketotestosterone (kt) than type ii males. is kt causal to phenotypic differences between morphs? we investigated this question in the midshipman fish (porichthys notatus) in which type i males have detectable levels of kt during the breeding season, wherea ... | 2005 | 15811353 |
| polyacetylenic compounds and butanol fraction from bidens pilosa can modulate the differentiation of helper t cells and prevent autoimmune diabetes in non-obese diabetic mice. | compelling evidence suggests that infiltrating cd4+ type i helper t (th1) cells in the pancreatic islets play a pivotal role in the progression of diabetes in non-obese diabetic (nod) mice. we demonstrate in the present report that a butanol fraction of b. pilosa suppressed the development of diabetes, helped maintain levels of blood sugar and insulin in nod mice in a dose-dependent manner and elevated the serum ige levels regulated by th2 cytokines in nod mice. moreover, the butanol fraction in ... | 2004 | 15549660 |
| [assessment of antioxidant activity of natural compound by water- and lipid-soluble antioxidant factor]. | we evaluated the antioxidant activity of natural compounds in water-soluble and lipid-soluble phases and found that ferulic acid, quercetin and caffeic acid showed stronger activity in the water-soluble phase. various fractions isolated from bidens pilosa showed this activity mainly in the water-soluble phase. antioxidant activity in the lipid-soluble phase of propolis depended on the lipophilic extraction. | 2004 | 15516812 |
| metabolite profiling and chemopreventive bioactivity of plant extracts from bidens pilosa. | bidens pilosa has been used as a folk medicine in various medications and as a popular ingredient in herb teas. chemopreventive activities of crude and fractionated plant extracts of bidens pilosa were evaluated in this study. ethyl acetate and butanolic fractions, partitioned from the total crude extract of bidens pilosa, exhibited significant scavenging free radical activity (ic(50) values approximately = with 14-17 microg/ml) comparable to that of alpha-tocopherol. strong effects on the inhib ... | 2004 | 15507368 |
| a logical (discrete) formulation for the storage and recall of environmental signals in plants. | when subjected to an appropriate asymmetric stimulus, seedlings of bidens pilosa l. "store" a symmetry-breaking instruction that will finally take effect (in the form of a differential growth of the cotyledonary buds) only if the plants are in a state in which they can "recall" this information. the ability of the plants to recall the stored symmetry-breaking instruction may be switched "on" or "off" by the application of a variety of stimuli. although its detailed phenomenology is rather compli ... | 2004 | 15375730 |
| in vitro study of the antioxidant and immunomodulatory activity of aqueous infusion of bidens pilosa. | bidens pilosa is an annual plant from tropical america with anti-inflammatory properties in hepatitis, laryngitis, headache and digestive disorders, among others. its wide pharmacological applications can be attributed to its chemical composition, with inhibitory effects on pathogenic microorganisms and flavonoids, which show strong antioxidant capacities. we investigated the antioxidant activity of an aqueous infusion of bidens pilosa by studying its protective effect on the hemolysis induced b ... | 2004 | 15234771 |
| new evidences of antimalarial activity of bidens pilosa roots extract correlated with polyacetylene and flavonoids. | bidens pilosa is among the several plants used in brazil to treat malaria. it was demonstrated that crude extracts from roots prepared with 80% ethanol by percolation are active in vitro against plasmodium falciparum and the activity is correlated with the presence of polyacetylene and flavonoids. this extract was submitted to column chromatography with ether and ether methanol (1:1) and two fractions, enriched in polyacetylene and flavonoids, respectively, were obtained. the extract and the fra ... | 2004 | 15182902 |
| antimalarial activity of bidens pilosa l. (asteraceae) ethanol extracts from wild plants collected in various localities or plants cultivated in humus soil. | bidens pilosa (asteraceae), a medicinal plant used worldwide, has antimalarial activity as shown in previous work. this study tested ethanol extracts from wild plants collected in three different regions of brazil and from plants cultivated in various soil conditions. the extracts were active in mice infected with p. berghei: doses of < or =500 mg/kg administered by oral route reduced malaria parasitaemia and mouse mortality; higher doses were found to be less effective. tested in vitro against ... | 2004 | 15476304 |
| polyacetylenes function as anti-angiogenic agents. | to investigate the antiangiogenic effects of plant extracts and polyacetylenes isolated from bidens pilosa linn., which is a popular nutraceutical herbal tea and folk medicine in anti-inflammatory, antitumor, and other medications worldwide. | 2004 | 15587935 |
| herbal mixtures in the traditional medicine of eastern cuba. | herbal mixtures in the traditional medicine of eastern cuba. traditional herbal mixtures in eastern cuba are investigated through interviews with 130 knowledgeable people and traditional healers of the provinces of santiago de cuba and guantánamo. one hundred seventy plant species and other products are used in 199 formulas, galones being the more complex. cocos nucifera l. (arecaceae), bidens pilosa l. (asteraceae), cissus sicyoides l. (vitaceae), erythroxylum havanense jacq. (erythroxylaceae) ... | 2004 | 15013195 |
| possible mechanisms of action of the neutral extract from bidens pilosa l. leaves on the cardiovascular system of anaesthetized rats. | the aim of this study was to investigate the hypotensive and cardiac effects of the neutral extract from bidens pilosa leaves. intravenous administration of the extract resulted in a biphasic dose-related hypotensive activity. in normotensive rats (ntr), b. pilosa decreased systolic blood pressure by 18.26%, 42.5% and 30% at doses of 10, 20 and 30 mg/kg, respectively. in spontaneously hypertensive rats (shr), the decrease in systolic blood pressure was 25.77%, 38.96% and 28.64% at the above dose ... | 2003 | 14669244 |
| wolbachia endosymbionts in fleas (siphonaptera). | intracellular endosymbionts, wolbachia spp., have been reported in many different orders of insects and in nematodes but not previously in fleas. this is the first conclusive report of wolbachia spp. within members of the siphonaptera. using nested polymerase chain reaction (pcr) targeting of the 16s ribosomal rna gene, we screened for wolbachia spp. in fleas collected from 3 counties in georgia and 1 in new york. the prevalence of wolbachia spp. detected varied among the 6 different species scr ... | 2003 | 12760642 |
| anti-herpes simplex virus activity of bidens pilosa and houttuynia cordata. | the present study evaluated the antiviral activity of bidens pilosa l. var. minor (blume) sherff and houttuynia cordata thunb., using cytotoxicity test with xtt-based colorimetric assay. bcc-1/kmc cells were infected with herpes simplex virus (hsv) and then were cultured with hot water extract of b. pilosa (hwbp) or h. cordata (hwhc). results showed that hwbp significantly inhibited the replication of hsv at a concentration of 100 microg/ml (11.9% for hsv-1, p < 0.01; 19.2% for hsv-2, p < 0.005) ... | 2003 | 12943167 |
| allelopathic potential of macaranga tanarius (l.) muell.-arg. | macaranga tanarius is widely distributed in the abandoned lowlands of taiwan where substantial amounts of leaves accumulate on the ground. a unique pattern of weed exclusion underneath trees is often found and thought to result from allelopathic interactions. density-dependent phytotoxicity analysis of lactuca sativa l. (lettuce) growing in soil mixed with the powder of m. tanarius leaves showed a significant deviation from the expected yield-density relationship. lettuce growth was most suppres ... | 2003 | 12857035 |
| a new disubstituted acetylacetone from the leaves of bidens pilosa linn. | phytochemical investigation of the leaves of bidens pilosa lead to the isolation and characterization of a new disubstituted acetylacetone (1) named as 3-propyl-3-(2,4,5-trimethoxy)benzyloxy-pentan-2,4-dione. | 2003 | 12674146 |
| investigation on the hypoglycaemic effects of extracts of four mexican medicinal plants in normal and alloxan-diabetic mice. | the hypoglycaemic activities of four water ethanol extracts (wee) prepared from bidens pilosa l., salvia officinalis l., psacalium peltatum h.b.k. (cass) and turnera diffusa willd. were investigated in healthy and alloxan-diabetic mice. the wee of s. officinalis significantly reduced the blood glucose of fasting normal mice 120 (15.7%) and 240 min (30.2%) after intraperitoneal administration (p < 0.05). the wee of p. peltatum and b. pilosa also significantly diminished glycaemia in healthy mice ... | 2002 | 12112298 |
| allelopathic potential and chemical constituents of volatiles from ageratum conyzoides under stress. | the allelopathic potential of ageratum conyzoides was investigated under different environmental stress conditions, including nutrient deficiency. physical damage, 2.4-d treatment, competition with bidens pilosa, infection with erysiphe cichoracearum, and feeding by aphiids gossypii. the inhibitory effects of a. conyzoides volatiles on peanut (arachis hypogaea), redroot amaranth (amaranthus retroflexus), cucumber (cucumis sativus), and ryegrass (lolium multiforum) increased when plants were grow ... | 2002 | 12184395 |
| leaf methanol extract of bidens pilosa prevents and attenuates the hypertension induced by high-fructose diet in wistar rats. | chronic fructose treatment in rats has repeatedly been shown to elevate blood pressure in association with insulin resistance and hyperinsulinemia. the purpose of the current study was to investigate the effect of the leaf methanol extract of bidens pilosa on systolic blood pressure (sbp) and plasma glucose, insulin, cholesterol, triglycerides and creatinine levels in rats with fructose-induced hypertension. wistar rats that drank a 10% fructose solution for 3-6 weeks showed significant increase ... | 2002 | 12426085 |
| the search for new antimalarial drugs from plants used to treat fever and malaria or plants ramdomly selected: a review. | in this review we discuss the ongoing situation of human malaria in the brazilian amazon, where it is endemic causing over 610,000 new acute cases yearly, a number which is on the increase. this is partly a result of drug resistant parasites and new antimalarial drugs are urgently needed. the approaches we have used in the search of new drugs during decades are now reviewed and include ethnopharmocology, plants randomly selected, extracts or isolated substances from plants shown to be active aga ... | 2001 | 11784919 |
| effects of the aqueous and methylene chloride extracts of bidens pilosa leaf on fructose-hypertensive rats. | we investigated the effects of the aqueous (150-350 mg/kg) and methylene chloride (150-300 mg/kg) extracts of bidens pilosa on fructose-induced hypertension in rats. food and liquid intake were measured as well as systolic blood pressure and plasma levels of glucose, insulin, cholesterol, triglycerides and creatinine. fructose feeding for 6 weeks induced hypertension, hyperinsulinemia and increased plasma triglyceride levels in male wistar rats. the aqueous and methylene chloride extracts of b. ... | 2001 | 11448541 |
| anti-microbial activity of bidens pilosa, bischofia javanica, elmerillia papuana and sigesbekia orientalis. | the ethanol extracts of bidens pilosa (whole plant), bischofia javanica (leaves), elmerillia papuana (root bark) and sigesbekia orientalis (whole plant) were partitioned (petrol, dichloromethane, ethyl acetate). the crude ethanolic extracts and all the obtained fractions showed a broad spectrum of antibacterial activity, the ethyl acetate fractions and the petrol fraction of e. papuana being the most effective. no activity was observed against the tested moulds. | 2001 | 11543964 |
| what's eating you? echidnophaga gallinacea (the sticktight flea). | 2001 | 11710441 | |
| [effect of medicinal plant extracts on the growth of microorganisms]. | extracts obtained from sweatweed and licorice roots, flax seeds, milfoil, bur-marigold, plantain, coltsfoot, nettle, indian corn stigmas, laminaria produced a stimulating effect on the growth of candida albicans test strain and streptococcus pyogenes test strain dick 1. sweatweed, licorice, aerva lanata and violet extracts influenced the growth of corynebacterium xerosis 1911, while sweatweed, violet, horse-tail, bur-marigold, camomile, plantain, and nettle extracts influenced the growth of shig ... | 2001 | 11871308 |
| antileukemic activity of bidens pilosa l. var. minor (blume) sherff and houttuynia cordata thunb. | to evaluate the anti-leukemic activity of bidens pilosa l. var. minor (blume) sherff and houttuynia cordata thunb., cytotoxicity tests with an xtt-based colorimetric assay were used. five leukemic cell lines, namely l1210, u937, k562, raji and p3hr1, were cultured with hot water extracts of b. pilosa var. minor or h. cordata. hot water extracts of b. pilosa var. minor inhibited these five leukemic cells with ic50s between 145 microg/ml and 586 microg/ml. the effect was greatest on four cell line ... | 2001 | 11527072 |
| 5-o-methylhoslundin: an unusual flavonoid from bidens pilosa (asteraceae). | 2000 | 10793259 | |
| a mathematical model for storage and recall functions in plants. | in plantlets of bidens pilosa l., under severely limiting environmental conditions the growth of the buds at the axil of the cotyledons (cotyledonary buds) is asymmetric (i.e. one of the buds starts growing before the other one), this asymmetry being oriented by the pricking of one of the cotyledons (i.e. pricking one cotyledon increases the probability that the bud at the axil of the other cotyledon be the first to start to grow). as long as the plant apex (i.e. the terminal bud) is present, th ... | 2000 | 10742914 |
| antihyperglycemic acetylenic glucosides from bidens pilosa. | in vivo bioassay-guided fractionation of the aqueous alcohol extract of the aerial parts of bidens pilosa sch. bip. var. radiata (asteraceae) using c57 bl/ks-db/db mice as a model for type 2 diabetes, yielded two known polyacetylenic glucosides, identified as 2-beta-d-glucopyranosyloxy-1-hydroxy-5(e)-tridecene-7,9,11-+ ++triyne (1) and 3-beta-d-glucopyranosyloxy-1-hydroxy-6(e)-tetradecene-8,10,1 2-triyne (2). a 3:2 mixture of compounds 1 and 2 effected a significant drop in blood glucose. | 2000 | 10705745 |
| effects of methanol, cyclohexane and methylene chloride extracts of bidens pilosa on various gastric ulcer models in rats. | ethnobotanical studies have revealed that bidens pilosa is used in the traditional management of wounds and chronic gastro-duodenal ulcers. this led us to screen the methanol, cyclohexane and methylene chloride extracts of the plant for anti-ulcerogenic activity using the hcl/ethanol gastric necrotizing solution. the methylene chloride extract, which showed the highest activity (100% inhibition) at a dose of 750 mg/kg compared with the methanol and cyclohexane extracts (41 and 46% inhibition, re ... | 2000 | 11090994 |
| immunosuppressive and anti-inflammatory effects of methanolic extract and the polyacetylene isolated from bidens pilosa l. | the immunomodulatory effect of the methanolic extract obtained from dried leaves of bidens pilosa l. (asteraceae) and the polyacetylene 2-o-beta-d-glucosyltrideca-11 e-en-3,5,7,9-tetrayn-1,2-diol (pa-1) isolated from it was investigated. the extract inhibited the proliferative response in two in vitro models: human lymphocytes stimulated by 5 microg ml(-1) phytohemagglutinin (pha) or to 100 nm 12-o-tetradecanoyl phorbol-13-acetate (tpa) plus 0.15 microm ionomycin and murine lymphocytes stimulate ... | 1999 | 10437654 |
| [hypotensive effects of a methanol extract of bidens pilosa linn on hypertensive rats]. | bidens pilosa linn is highly regarded in some parts of cameroon in traditional folk medical practices. the hypotensive effects of the leaf methanol extract from bidens pilosa linn (asteraceae) were evaluated in spontaneously hypertensive rats (shr), salt-loading hypertensive rats (slhr) and normotensive wistar rats (ntr) using the indirect (tail-cuff) method. acute changes in urine volume and urinary excretion of na+ and k+ were also studied. the hypotensive effect of the extract was more remark ... | 1999 | 10216804 |
| gastric antisecretory and antiulcer activities of an ethanolic extract of bidens pilosa l. var. radiata schult. bip. | bidens pilosa var. radiata schult. bip. is used in folk medicine to treat stomach disorders including peptic ulcers. the ethanolic extract (0.5-2 g/kg) decreased the gastric juice volume, acid secretion, as well as pepsin secretion in pylorus ligated rats. b. pilosa extract showed antiulcer activity against indomethacin-induced gastric lesions. the extract effectively inhibited gastric haemorrhagic lesions induced by ethanol, and with an effective dose of 2 g/kg being more potent than sucralfate ... | 1999 | 10617069 |
| synthesis and herbicidal activity of 2alpha, 4alpha-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one derivatives. | the catalytic oxidation of 2alpha,4alpha-dimethyl-8-oxabicyclo[3.2. 1]oct-6-en-3-one with osmium tetraoxide and excess hydrogen peroxide resulted in the formation of 2alpha,4alpha-dimethyl-6, 7-exo-isopropylidenedioxy-8-oxabicyclo[3.2.1]octan-3-one (2), with 91% yield. addition of aryllithium reagents to this compound resulted in the formation of the aromatic alcohols (6a-h) with 48-76% yield. these alcohols were treated with thionyl chloride in pyridine, and the corresponding alkenes (7a-h) wer ... | 1999 | 10552894 |
| activities of the pharmaceutical technology institute of the oswaldo cruz foundation with medicinal, insecticidal and insect repellent plants. | in addition to original research, far-manguinhos, the pharmaceutical division of the brazilian ministry of health's oswaldo cruz foundation (fiocruz), devotes major attention to the finalising of products for use in public health campaigns or, under contract, for private industrial development. emphasis is on standardisation, adequate supply, safety in use and efficacy. among the products discussed in this summary of some of its activities in the chemical and pharmaceutical fields are medicinal ... | 1999 | 10412493 |
| effects of leaf aqueous extract of bidens pilosa (asteraceae) on kcl- and norepinephrine-induced contractions of rat aorta. | the effect of leaf aqueous extract of bidens pilosa linn. on kcl- and norepinephrine-induced contractions of rat aortic strips was studied. in aortic strips with endothelium intact, contractions induced using 60 mm kcl and 10(-5) m norepinephrine were dose-dependently relaxed by the extract, a more significant effect being seen with norepinephrine-induced contractions. following mechanical damage to the aortic endothelium, inhibition of contractions was more prominent (105%) with the norepinephr ... | 1998 | 9582009 |
| antibacterial activity of south african plants used for medicinal purposes. | crude extracts from 21 south african medicinal plants, traditionally used for ailments of an infectious or septic nature, were screened for in vitro antibacterial activity using the agar diffusion and dilution methods. almost all the activity exhibited was against gram-positive bacteria, with 12 of the 21 plant species tested showing some activity against bacillus subtilis. only the warburgia salutaris methanol extract inhibited the growth of escherichia coli. none of the extracts had any activi ... | 1997 | 9147258 |
| antimalarial activity of extracts and fractions from bidens pilosa and other bidens species (asteraceae) correlated with the presence of acetylene and flavonoid compounds. | after interviewing natives and migrants from the amazon region of brazil about plants traditionally used for treatment of malaria fever and/or liver disorders, we selected and identified 41 different species, including the native bidens (asteraceae). we have undertaken an antimalarial study of bidens pilosa and other species of bidens from abroad. the crude ethanol extracts (whole plant, leaves and roots) and the chloroform and butanol fractions from b. pilosa at concentrations of 50 microg/ml c ... | 1997 | 9254115 |
| sticktight fleas associated with fowl pox in a backyard chicken flock in california. | a mixed breed rooster, from a backyard flock of 13 chickens, was received at california veterinary diagnostic laboratory system-turlock branch for postmortem examination. the bird presented with thickened, featherless, scab-encrusted skin around the head region. numerous sticktight fleas were found attached to the encrusted skin. microscopic evaluation of the skin revealed a lymphoplasmacytic reaction in the dermis with visible embedded flea mouthparts. also noted histologically in this region w ... | 1997 | 9454942 |
| [drug or plant substances which antagonize venoms or potentiate antivenins]. | dendroaspis jamesoni (elapidae) and echis oceliatus (viperidae) are responsible for most of severe evenomation in cameroon. toxicity of venoms of these two species has been measured using mice according to the method of spearman & kàrber. the effect on experimental envenomation of various drugs (atropine, promethazine, neostigmine, hydrocortisone, pentosane sulfuric polyester, heparin, tranexamic acid and aminocaproic acid) and plant extracts (schumanniophyton magnificum, bidens pilosa, securida ... | 1997 | 9479470 |
| is membrane potential involved in calmodulin gene expression after external stimulation in plants? | in bidens pilosa (cv. radiata), a non-injurious stimulus induces a local and transient change in membrane potential, and an injurious stimulus induces a transmitted electrical signal described as the combination of an action potential and a slow wave. we have studied calmodulin gene expression after these stimuli. when the stimulus is non-injurious, calmodulin mrna accumulation is only increased in the stimulated region. in contrast, when the stimulus is injurious, mrna accumulation takes place ... | 1996 | 8603755 |
| the hepatoprotective effects of taiwan folk medicine ham-hong-chho in rats. | bidens pilosa l. var minor (blume) sherff, b. pilosa l. and b. chilensis dc (compositae), commonly known as "ham-hong-chho" in taiwan, have been traditionally used for medicinal purposes. to clarify and compare the hepatoprotective effects of these three plants, we evaluated their potential effectiveness on ccl4- and acetaminophen-induced acute hepatic lesions in rats. the results indicated that the increase in sgot and sgpt activities caused by ccl4 (3.0 ml/kg, s.c.) and acetaminophen administr ... | 1996 | 8982435 |
| bioactive polyacetylenes from bidens pilosa. | from the methanolic extract of the whole plants of bidens pilosa the new beta-d-glucopyranosyloxy-3-hydroxy-6(e)-tetradecen-8, 10,12-triyne besides a known polyine has been isolated and identified mainly by ir and nmr methods. the new compound showed overgrowing action against normal and transformed human cell lines in culture. | 1996 | 8792670 |
| screening of zulu medicinal plants for prostaglandin-synthesis inhibitors. | aqueous and ethanolic extracts of 39 plants used in traditional zulu medicine to treat headache or inflammatory diseases were screened for prostaglandin-synthesis inhibitors. extracts were tested in an in vitro assay for cyclooxygenase inhibitors. in general, ethanolic extracts caused higher inhibition than aqueous extracts. two-thirds of the plants screened had high inhibitory activity. the highest inhibition was obtained with ethanolic extracts of bidens pilosa, eucomis autumnalis, harpephyllu ... | 1996 | 8735453 |
| anti-inflammatory activity of taiwan folk medicine "ham-hong-chho" in rats. | "ham-hong-chho" is a folk medicine in taiwan, derived from the entire plants of bidens pilosa l. var. minor (blume) sherff (compositae), b. pilosa l. and b. chilensis dc. the anti-inflammatory effect of aqueous extracts of the three plants against paw edema induced by carrageenan and chronic arthritis induced by complete freund's adjuvant were determined in rats. the results indicated that paw edema induced by carrageenan was significantly decreased by treatment with aqueous extracts (150 or 300 ... | 1995 | 8571923 |
| the ethnopharmacology of madeira and porto santo islands, a review. | the ethnopharmacology of madeira and porto santo islands is extremely interesting because of the cultural and biogeographic features of this region, which make it a centre of medicinal plant diversity (richness of endemic flora, geographical isolation in the atlantic sea, crosscultural influences, and past abundance of local healers). the medicinal flora of madeira is composed of 259 species. some noteworthy medicinal taxa, endemic or locally relevant, are: acanthus mollis, aeonium glandulosum, ... | 1995 | 7650952 |
| sticktight fleas (echidnophaga gallinacea) on birds. | 1992 | 1557875 | |
| constituents and biological activity of bidens pilosa l. grown in egypt. | column chromotography and preparative tlc of the light petroleum-diethyl ether extract from bidens pilosa l. afforded tridecapentyn-1-ene, trideca-2,12-diene-4,6,8,10-tetrayne-1-ol, trideca-3,11-diene-5,7,9-triyne-1,2-diol and trideca-5-ene-7,9,11-triyne-3-ol. the compounds were identified on the bases of uv, 1h-nmr spectra and comparison with reported data. the chloroform extract was chromatographed to yield b-amyrin, phytosterin-b, esculetin and b-sitosterol glucoside. the petroleum ether extr ... | 1991 | 1785360 |
| control of a symmetry-breaking process in the course of the morphogenesis of plantlets of bidens pilosa l. | a mechanism involving transport, storage and retrieval of a symmetry-breaking message controls the relative growth rate of the cotyledonary buds of plantlets of bidens pilosa l. the asymmetry was induced by administering a few needle pricks to one cotyledon of each plant. the storage of the symmetry-breaking message was independent of the number of pricks ("all or nothing" process) and irreversible. however, various treatments could render the plants either able to retrieve the stored symmetry-b ... | 1991 | 24194158 |
| constituents of bidens pilosa l.: do the components found so far explain the use of this plant in traditional medicine? | the dried aerial parts of bidens pilosa l. were extracted with petrol ether, chloroform, methanol, and methanol/water. the petrol ether and the methanol/water extracts showed some antimicrobial activity. fractionation of the extracts yielded well known substances, most of which have, however, not yet been described as constituents of bidens pilosa. several of these substances have previously been shown to be biologically active. thus, phenylheptatriyne, linolic acid and linolenic acid have antim ... | 1991 | 1674399 |
| [the antistaphylococcal properties of plant extracts in relation to their prospective use as therapeutic and prophylactic formulations for the skin]. | antistaphylococcal activities of plant extracts (12 water alcohol glycerol, wag, 6 water alcohol, wa, 8 alcohol glycerol, ag, extracts) towards reference strains and those isolated from patients with pyoinflammatory diseases of the skin were examined by diluting the preparations in solid media. the strains under study were 69 s. aureus, 44 s. epidermidis, and 2 s. saprophyticus ones. fifteen plant extracts have shown antistaphylococcal activities. the most active were oak bark, sage and st. john ... | 1990 | 2256382 |
| [the role of mineral ions in controlling morphogenesis in plants: a case of the inhibition of growth of the hypocotyle of bidens pilosa l]. | mineral ions are implicated in various events occurring in the transduction of messages in plants, from the reception of the initial signal to the final morphogenetic expression. ions may be involved also in the possible migration, storage and retrieval of the message. in a number of cases, cellular exchange of ca2+ have been shown to occur at the reception of a signal. this is the reason why ca2+ has often been considered as a "second messenger". for the possible message migration, cellular exc ... | 1989 | 2534954 |
| [further acylated chalcones from bidens pilosa]. | three new acylated chalcone glucosides [okanin 4'- o-beta- d-(4''-acetyl-6''- trans- p-coumaroyl)-glucoside, okanin 4'- o-beta- d-(2'',4''-diacetyl-6''- trans- p-coumaroyl)-glucoside, and okanin 4'- o-beta- d-(3'',4''-diacetyl-6''- trans- p-coumaroyl)-glucoside] have been isolated from the leaves of bidens pilosa l. (asteraceae). their structures have been elucidated by spectroscopic methods ( (1)h-nmr, 2d- (1)h-nmr, (13)c-nmr spectroscopy). | 1988 | 17265312 |
| new chalcones from bidens pilosa. | okanin 4'- o-beta- d-(2'',4'',6''-triacetyl)-glucoside, okanin 4'- o-beta- d-(6''- trans-p-coumaroyl)-glucoside, both new natural compounds, and okanin 3'- o-beta- d-glucoside have been isolated from the leaves of bidens pilosa l. their structures have been elucidated by means of uv, fd-ms, (1)h-nmr, and (13)c-nmr spectroscopy. nmr spectral data for okanin 4'- o-beta- d-glucoside (marein) are given. | 1988 | 17265204 |
| test of catechol, tannic acid, bidens pilosa, croton oil, and phorbol for cocarcinogenesis of esophageal tumors induced in rats by methyl-n-amylnitrosamine. | catechol (cas: 120-80-9), given in drinking water to rats, was the most effective of 5 phenols in enhancing [3h]thymidine incorporation [( 3h]dthd-l) into esophageal dna. to test for esophageal cocarcinogenesis, groups of 30 male mrc-wistar rats received 3 weekly ip injections of 25 mg methyl-n-amylnitrosamine [(mnan) cas: 13256-07-0]/kg. from the time of the first mnan injection, each group also received catechol, tannic acid (cas: 1401-55-4), dried leaves of bidens pilosa l., or croton oil (ca ... | 1985 | 3858597 |
| the dynamics of seed harvesting in early successional communities by a tropical ant, solenopsis geminata. | the neotropical ant, solenopsis geminata, in the moist lowlands of southeastern mexico was most abundant in agricultural fields and early second growth habitats. it was not found within forest habitats.in addition to its foraging for insects and general scavenging, this ant also harvests seeds. under field experimental conditions, a wide variety of small seeds, especially grasses, were taken. nest mound size and number were greatest on plots experimentally seeded to high grass density and low on ... | 1984 | 28311068 |
| evaluation of allelopathic potential of dominant herbaceous species in a coffee plantation. | several shaded coffee plantations in coatepec, veracruz (mexico) are characterized by a dense cover of herbaceous vegetation mainly dominated by species from the commelinaceae which protect the soil from erosion and presumably contribute to regulating the abundance of other weeds. to detect their alleopathic potential, leachates from fresh, air-dried, or oven-dried plants and litter collected during different months of the year were tested uponbrassica campestris, bidens pilosa, andrumex sp. see ... | 1983 | 24407802 |
| photosensitization of escherichia coli and saccharomyces cerevisiae by phenylheptatriyne from bidens pilosa. | 1980 | 6994864 | |
| studies on the esophagus. ii. enhancement of [3h]thymidine incorporation in the rat esophagus by bidens pilosa (a plant eaten in south africa) and by croton oil. | 1979 | 421195 | |
| ultraviolet-mediated cytotoxic activity of phenylheptatriyne from bidens pilosa l. | the tropical weed bidens pilosa l. (asteraceae) contains a number of polyacetylenes which are phototoxic to bacteria, fungi, and human fibroblast cells in the presence of sunlight, artificial sources of long-wave ultraviolet light, or cool-white fluorescent light. the principle photoactive compound in the leaf, phenylheptatriyne, is present in the cuticle as well as in the underlying cells. experiments with calf thymus dna indicate that, unlike photoactive furanocoumarins, phenylheptatriyne does ... | 1979 | 469551 |
| biochemical changes in terminal root galls caused by an ectoparasitic nematode, longidorus africanus - nucleic acids. | changes in dna and rna in roots of bur marigold fed upon by longidorus africanus were studied using analytical methods, radioactive precursors, and analytical csc1 density-gradient centrifugation. the analyses showed that almost twice as much rna and dna was present in parasitized root tips as in those of nonparasitized control plants. studies on the rates of incorporation of labeled thymidine and uridine confirmed the dna levels determined by analytical methods, but revealed a much higher incor ... | 1974 | 19319364 |