Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.618.100.970 [Categoria DeCS]
Referências encontradas : 4 [refinar]
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  1 / 4 MEDLINE  
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PMID:28341630
Autor:Mamut J; Xiong YZ; Tan DY; Huang SQ
Endereço:Xinjiang Key Laboratory of Grassland Resources and Ecology and Ministry of Education Key Laboratory for Western Arid Region Grassland Resources and Ecology, College of Grassland and Environment Sciences, Xinjiang Agricultural University, Ürümqi 830052, China.
Título:Flexibility of resource allocation in a hermaphroditic-gynomonoecious herb through deployment of female and male resources in perfect flowers.
Fonte:Am J Bot; 104(3):461-467, 2017 Mar.
ISSN:1537-2197
País de publicação:United States
Idioma:eng
Resumo:PREMISE OF THE STUDY: It has been hypothesized that two flower types permit flexible allocation of resources to female and male functions, yet empirical evidence for the sex-allocation hypothesis remains scarce in gynomonoecious species. To characterize resource allocation to pistillate and perfect flowers and allocation of perfect flowers between gynomonoecious and hermaphroditic individuals, we examined the flexibility and whether female-biased allocation increases with plant size in the hermaphroditic-gynomonoecious herb . METHODS: Frequency of gynomonoecious individuals, flower production, and plant size were investigated in different populations. Floral allocation was compared among the three flower types of . KEY RESULTS: Frequency of gynomonoecious plants varied from 2-17% in nine populations. Only larger plants produced female flowers at the bottom of racemes. Both female and perfect flower production tended to increase proportionately with plant size in gynomonoecious individuals. Female flowers did not produce less biomass than perfect flowers from hermaphroditic or gynomonoecious plants. However, both female and perfect flowers from gynomonoecious individuals had lighter stamen mass, but larger pistil mass, than perfect flowers from hermaphrodites. CONCLUSIONS: Although the prediction of an increase in female flower number with plant size was not observed in , the flexibility of sex allocation in gynomonoecious species was confirmed in that gynomonoecious individuals had a female-biased floral allocation compared to hermaphroditic individuals. Such comparisons of gynomonoecious to hermaphroditic individuals permit us to unveil a sexual adjustment strategy: flexibility of sexual investments within plants.
Tipo de publicação: JOURNAL ARTICLE


  2 / 4 MEDLINE  
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PMID:28338625
Autor:Rossi D; Ahmed KM; Gaggeri R; Della Volpe S; Maggi L; Mazzeo G; Longhi G; Abbate S; Corana F; Martino E; Machado M; Varandas R; Sousa MD; Collina S
Endereço:Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy. daniela.rossi@unipv.it.
Título:(R)-(-)-Aloesaponol III 8-Methyl Ether from Eremurus persicus: A Novel Compound against Leishmaniosis.
Fonte:Molecules; 22(4), 2017 Mar 24.
ISSN:1420-3049
País de publicação:Switzerland
Idioma:eng
Resumo:Leishmaniosis is a neglected tropical disease which affects several millions of people worldwide. The current drug therapies are expensive and often lack efficacy, mainly due to the development of parasite resistance. Hence, there is an urgent need for new drugs effective against infections. As a part of our ongoing study on the phytochemical characterization and biological investigation of plants used in the traditional medicine of western and central Asia, in the present study, we focused on root extract in order to evaluate its potential in the treatment of leishmaniosis. As a result of our study, aloesaponol III 8-methyl ether (ASME) was isolated for the first time from root extract, its chemical structure elucidated by means of IR and NMR experiments and the ( ) configuration assigned by optical activity measurements: chiroptical aspects were investigated with vibrational circular dichroism (VCD) and electronic circular dichroism (ECD) spectroscopies and DFT (density functional theory) quantum mechanical calculations. Concerning biological investigations, our results clearly proved that ( )-ASME inhibits promastigotes viability (IC 73 µg/mL), inducing morphological alterations and mitochondrial potential deregulation. Moreover, it is not toxic on macrophages at the concentration tested, thus representing a promising molecule against infections.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 ((R)-aloesaponol III- 8 methyl ether); 0 (Anthraquinones); 0 (Methyl Ethers)


  3 / 4 MEDLINE  
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PMID:27437404
Autor:Balogun FO; Tshabalala NT; Ashafa AO
Endereço:Phytomedicine and Phytopharmacology Research Group, Department of Plant Sciences, University of the Free State, Qwaqwa Campus, Private Bag X 13, Phuthaditjhaba 9866, South Africa.
Título:Antidiabetic Medicinal Plants Used by the Basotho Tribe of Eastern Free State: A Review.
Fonte:J Diabetes Res; 2016:4602820, 2016.
ISSN:2314-6753
País de publicação:Egypt
Idioma:eng
Resumo:Diabetes mellitus (DM) belongs to the group of five leading important diseases causing death globally and remains a major health problem in Africa. A number of factors such as poverty, poor eating habit, and hormonal imbalance are responsible for the occurrence of the disease. It poses a major health challenge in Africa continent today and the prevalence continues to increase at an alarming rate. Various treatment options particularly the usage of herbs have been effective against diabetes because they have no adverse effects. Interestingly, South Africa, especially the Basotho tribe, is blessed with numerous medicinal plants whose usage in the treatment of DM has been effective since the conventional drugs are expensive and often unaffordable. The present study attempted to update the various scientific evidence on the twenty-three (23) plants originating from different parts of the world but widely used by the Sotho people in the management of DM. Asteraceae topped the list of sixteen (16) plant families and remained the most investigated according to this review. Although limited information was obtained on the antidiabetic activities of these plants, it is however anticipated that government parastatals and scientific communities will pay more attention to these plants in future research.
Tipo de publicação: JOURNAL ARTICLE; REVIEW
Nome de substância:0 (Hypoglycemic Agents); 0 (Plant Preparations)


  4 / 4 MEDLINE  
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PMID:27090391
Autor:Duval J; Destandau E; Pecher V; Poujol M; Tranchant JF; Lesellier E
Endereço:Univ. Orléans, CNRS, ICOA, UMR 7311, F-45067 Orléans, France.
Título:Selective enrichment in bioactive compound from Kniphofia uvaria by super/subcritical fluid extraction and centrifugal partition chromatography.
Fonte:J Chromatogr A; 1447:26-38, 2016 May 20.
ISSN:1873-3778
País de publicação:Netherlands
Idioma:eng
Resumo:Nowadays, a large portion of synthetic products (active cosmetic and therapeutic ingredients) have their origin in natural products. Kniphofia uvaria is a plant from Africa which has proved in the past by in-vivo tests an antioxidant activity due to compounds present in roots. Recently, we have observed anthraquinones in K. uvaria seeds extracts. These derivatives are natural colorants which could have interesting bioactive potential. The aim of this study was to obtain an extract enriched in anthraquinones from K. uvaria seeds which mainly contains glycerides. First, the separation of the seed compounds was studied by using supercritical fluid chromatography (SFC) in the goal to provide a rapid quantification method of these bioactive compounds. A screening of numerous polar stationary phases was achieved for selecting the most suited phase to the separation of the four anthraquinones founded in the seeds. A gradient elution was optimized for improving the separation of the bioactive compounds from the numerous other families of major compounds of the extracts (fatty acids, di- and triglycerides). Besides, a non-selective and green Supercritical Fluid Extraction (SFE) with pure CO2 was applied to seeds followed by a Centrifugal Partition Chromatography (CPC). The CPC system was optimized by using the Arizona phase system, to enrich the extract in anthraquinones. Two systems were selected to isolate the bioactive compounds from the oily extract with varied purity target. The effect of the injection mode for these very viscous samples was also studied. Finally, in order to directly apply a selective process of extraction to the seeds, the super/subcritical fluid extraction was optimized to increase the anthraquinone yield in the final extract, by studying varied modifier compositions and nature, as well as different temperatures and backpressures. Conditions suited to favour an enrichment factor bases on the ratio of anthraquinone and trilycerides extracted are described.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Anthraquinones); 0 (Diglycerides); 0 (Fatty Acids, Nonesterified); 0 (Plant Extracts); 0 (Plant Oils); 0 (Triglycerides)



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