Database : LILACS
Search on : B01.650.940.800.575.912.063.222.222 [DeCS Category]
References found : 3 [refine]
Displaying: 1 .. 3   in format [Large]

page 1 of 1

  1 / 3 LILACS  
              next record last record
to print
SciELO Brazil full text
Full text
Full text
Id: biblio-1039037
Author: Erhirhie, Earnest Oghenesuvwe; Ilodigwe, Emmanuel Emeka.
Title: Sub-chronic toxicity evaluation of Dryopteris filix-mas (L. ) schott, leaf extract in albino rats
Source: Braz. J. Pharm. Sci. (Online);55:e18107, 2019. tab, graf.
Language: en.
Abstract: This study evaluated the acute and sub-chronic toxicities of ethanol leaf extract of Dryopteris filix-mas. Acute toxicity and phytochemical tests on ethanol leaf extract were determined. In sub-chronic toxicity test, animals were treated with 62.5, 125, 250 and 500 mg/kg of extract every day for 90 days. Blood samples were collected via retro-orbital puncture for baseline studies and at 31, 61 and 91st days for determination of hematological, kidney and liver function parameters. Liver and kidneys were harvested for histopathology analyses on 91st day. Also, a 28 day recovery study was carried out to determine reversibility in toxicological effects. Phytochemical screening revealed the presence of tannins, phenols, flavonoids, saponins, steroids, alkaloids, terpenoids, reducing sugar and cardiac glycosides. Acute toxicity test did not show toxicity or death at 5000 mg/kg. There was significant (p<0.005) reduction in white blood cell and lymphocyte counts, significant (p<0.05) increase in some liver and kidney biomarkers as well as alterations in liver and kidney histo-architecture on 91st days in animals that were treated with 250 and 500 mg/kg extract. However, toxicities observed on 91st day were reversible in recovery studies. The leaf extract of Dryopteris filix-mas may be hepatotoxic and nephrotoxic when used for long periods
Responsable: BR40.1 - DBD - Divisão de Biblioteca e Documentacão do Conjunto das Químicas

  2 / 3 LILACS  
              first record previous record next record last record
to print
SciELO Costa Rica full text
Full text
Id: lil-637850
Author: Reyes-Jaramillo, Irma; Camargo-Ricalde, Sara Lucía; Aquiahuatl-Ramos, Ma. de los Ángeles.
Title: Mycorrhizal-like interaction between gametophytes and young sporophytes of the fern Dryopteris muenchii (Filicales) and its fungal endophyte
Source: Rev. biol. trop;56(3):1101-1107, sep. 2008. ilus.
Language: en.
Abstract: The morphology of a Glomus-like fungus-host interaction in chlorophyllous gametophytes and young apogamic sporophytes of Dryopteris muenchii A.R. Sm. was studied from ferns cultivated in laboratory, using soil as substrate. An aseptate fungus colonized the gametophytes' tissue through the rhizoids, developing vesicles. The fungus penetrated the young sporophytes primary roots by developing appressoria. It spread forming inter- and intra-cellular hyphae through the epidermis and the outermost cortical cell layers, where it formed vesicles, hyphal coils-like and arbuscules. The fungus hyphae never colonized the gametophyte-sporophyte cellular junction. The fungal structures observed on D. muenchii during this study, are rather similar to those reported for the plant host-arbuscular mycorrhizal fungus (AMF) interaction, where the AMF described belonged to Phylum Glomeromycota. Therefore, this study is a contribution to the scarce knowledgement of the association between AMF and chlorophyllous gametophytes and young apogamic sporophytes of ferns. Rev. Biol. Trop. 56 (3): 1101-1107. Epub 2008 September 30.

Se describe la morfología de un hongo endófito afín al género Glomus, como colonizador de gametofitos clorofílicos y de esporofitos apogámicos jóvenes del helecho Dryopteris muenchii A.R. Sm.; el estudio se llevó a cabo con helechos cultivados en el laboratorio y utilizando tierra como substrato. El tejido del gametofito fue colonizado, a través de los rizoides, por un hongo miceliar aseptado, el cual formó vesículas. El hongo logró penetrar las raíces primarias de los esporofitos jóvenes desarrollando apresorios. El hongo se dispersó formando hifas inter- e intra-celulares a través de la epidermis y de la capa de células corticales más externas, donde produjo vesículas, estructuras similares a ovillos y arbúsculos. Las hifas del hongo nunca colonizaron las células de la unión entre el gametofito y el esporofito. Las estructuras observadas durante este estudio en D. muenchii, son muy similares a las de la interacción planta hospedera-hongo micorrícico arbuscular (HMA), en donde el HMA descrito corresponde al Phylum Glomeromycota. Por lo anterior, este estudio es una contribución al escaso conocimiento que se tiene sobre la asociación entre los HMA y gametofitos clorofílicos y esporofitos apogámicos de helechos jóvenes.
Responsable: CR1.1 - BINASSS - Biblioteca Nacional de Salud y Seguridad Social

  3 / 3 LILACS  
              first record previous record
to print
Full text
Id: lil-492166
Author: Hernández, Victoria; Terrazas, Teresa; Angeles, Guillermo.
Title: Anatomía de seis especies de helechos del género Dryopteris (Dryopteridaceae) de México / Anatomy of six species of Dryopteris ferns (Dryopteridaceae) from Mexico
Source: Rev. biol. trop;54(4):1157-1169, dic. 2006. ilus, tab.
Language: es.
Project CONACyT.
Abstract: Rhizome and foliar anatomy of the Mexican Dryopteris Adans. species were studied and compared with other Dryopteridaceae and other fern families to identify anatomical features with diagnostic value. The anatomy of rhizome, stipe, and blade is similar in species of the Dryopteris patula complex. The cells with un-lignified, thickened wall, with cap or U-shape around the meristeles belong to the collenchyma, in contrast with other fern families. Dryopteris wallichiana (Spreng.) Hyl. is anatomically distinguished from the other studied species by having more layers of sclerenchyma and meristeles on the stipe, and by the lack of sclereid nests on the rhizome. Dryopteris rossii C. Chr. and D. maxonii Underw. & C. Chr. are characterized by the presence of crystals on the periphery of rhizome nests. D. maxonni and D. wallichiana lack blade glands.

Se estudió la anatomía del rizoma y hoja de especies mexicanas de Dryopteris Adans. y se comparó con la información disponible para Dryopteridaceae y otras familias de helechos en busca de caracteres anatómicos con valor diagnóstico. La anatomía de rizoma, pecíolo y lámina es similar en las especies del complejo Dryopteris patula. Las células con pared engrosada, no lignificada y en forma de casquete o de “U” presentes alrededor de las meristelas corresponden a colénquima, a diferencia de lo informado para otras familias de helechos. Dryopteriswallichiana (Spreng.) Hyl. se distingue anatómicamente de las otras especies estudiadas por presentar un mayor número de capas de esclerénquima y de meristelas en el pecíolo, además de carecer de nidos de esclereidas en el rizoma. Dryopteris rossii y D. maxonii se caracterizan por la presencia de cristales en la periferia de los nidos en el rizoma. Las glándulas en la lámina están ausentes en D. maxonii y D. wallichiana.
Responsable: BR1.1 - BIREME

page 1 of 1

Refine the search
  Database : Advanced form   

    Search in field  

Search engine: iAH v2.6 powered by WWWISIS

BIREME/PAHO/WHO - Latin American and Caribbean Center on Health Sciences Information