Dynamics of natural infection by Toxoplasma gondii in goat herds in the semiarid region of northeastern Brazil: transitional antibody observation     

Sousa  Larissa Nascimento  Batista  Samira Pereira  Silva  Samara Santos  da Silva  Rômulo Fylipe  Sarmento  Wlysse Ferreira  Mota  Rinaldo Aparecido  Brasil  Arthur Willian Lima  Amaku  Marcos  Feitosa  Thais Ferreira  Vilela  Vinícius Longo Ribeiro 《Veterinary research communications》2022,46(2):507-515

Veterinary Research Communications - This study aimed to describe the transmission of T. gondii in naturally infected goats in the semiarid region of northeastern Brazil, through evaluating the...  相似文献   

Trypanocidal activity of extracts and fractions of Bertholletia excelsa     

Campos FR  Januário AH  Rosas LV  Nascimento SK  Pereira PS  França SC  Cordeiro MS  Toldo MP  Albuquerque S 《Fitoterapia》2005,76(1):26-29

Crude extracts and fractions of Bertholletia excelsa stem barks were tested for trypanocidal activity. Acetone and methanol extracts showed significant in vitro trypanocidal activity against trypomastigote form of Trypanosoma cruzi since in the concentration of 500 microg/ml, the parasites were reduced in 100% and 90.3% respectively, whereas the triterpene betulinic acid pure isolated from hexane extract presented 75.4%.  相似文献   

<Emphasis Type="Italic">Pinus halepensis</Emphasis> somatic embryogenesis is affected by the physical and chemical conditions at the initial stages of the process     

Catia Pereira  Itziar Aurora Montalbán  Olatz García-Mendiguren  Tomás Goicoa  Maria Dolores Ugarte  Sandra Correia  Jorge Manuel Canhoto  Paloma Moncaleán 《Journal of Forest Research》2016,21(3):143-150

Pinus halepensis has been described as a drought-tolerant species with high plasticity to growth in different environments. Its eco-physiological characteristics could facilitate the use of this species in large afforestations in the future scenery of climate change. Somatic embryogenesis is a biotechnological tool with potential for large-scale clonal propagation. In order to establish an improved regeneration protocol for Pinus halepensis, the effects of different temperatures (18, 23, and 28 °C) and water availability conditions (2, 3, and 4 g L^?1 Gelrite^®), during initiation of embryonal masses on the rate of initiation, proliferation, maturation, and the number of embryos developed, were evaluated. It was found that environmental conditions during the initiation stage of Pinus halepensis somatic embryogenesis influence the success of initiation and proliferation. In contrast, there was no effect of these conditions on the maturation rates and the number of somatic embryos. Somatic embryos were obtained in all treatments tested, indicating that plants can be produced from extreme conditions of induction, such as high temperatures (28 °C) and low water availability conditions (4 g L^?1).  相似文献   

Nitrogen uptake from 15N-enriched fertilizer by four tree crops in an Amazonian agroforest     

Harald Dinkelmeyer  Johannes Lehmann  Andreas Renck  Lucerina Trujillo  Jose Pereira da Silva Jr  Gerhard Gebauer  Klaus Kaiser 《Agroforestry Systems》2003,57(3):213-224

Mixed tree cropping systems have been proposed for sustainable nutrient management in the humid tropics. Yet, the nutrient interactions between intercropped trees have not been addressed sufficiently. In the present study we compare the temporal and spatial patterns of the uptake of applied ¹⁵N by four different tree crops in a mixed tree cropping system on a Xanthic Ferralsol in central Amazônia, Brazil, during one year. Most of the N uptake occurred during the first two weeks. Very little N was recovered by peach palm (Bactris gasipaes), more by cupuassu (Theobroma grandiflorum) and annatto (Bixa orellana) and most by Brazil nut (Bertholletia excelsa). Due to tree pruning the total accumulation of applied ¹⁵N in the above-ground biomass of annatto decreased throughout the year. It remained constant in cupuassu and peach palm and increased in Brazil nut. Brazil nut showed an extensive root activity and took up more fertilizer N applied to neighboring trees than from the one applied under its own canopy in contrast to the other three tree crops. Therefore, trees with wide-spread root systems may not need to receive N fertilizer directly but can take up N applied to other trees in the mixed cropping system. This means that such trees may effectively decrease N leaching when intercropped with trees that have dormant periods or places with low N uptake, but also exert considerable resource competition.This revised version was published online in November 2005 with corrections to the Cover Date.  相似文献   

Sensitivity of fungi isolated from onychomycosis to Eugenia cariophyllata essential oil and eugenol   总被引：1，自引：0，他引：1  

Gayoso CW  Lima EO  Oliveira VT  Pereira FO  Souza EL  Lima IO  Navarro DF 《Fitoterapia》2005,76(2):247-249

The antifungal activity of Eugenia cariophyllata essential oil and eugenol, its major constituent, on fungal strains isolated from onychomycosis was evaluated. The natural products presented prominent antifungal action with MIC of 1% and 4%, respectively.  相似文献   

Chemical composition and variability of cork from Quercus suber L.     

H. Pereira 《Wood Science and Technology》1988,22(3):211-218

Summary The chemical composition of cork from Quercus suber L. was determined for virgin cork and for reproduction cork. Average chemical composition of virgin cork is: ash 0.7%, total extractives 15.3%, suberin 38.6%, lignin 21.7% and polysaccharides 18.2%. The carbohydrate composition shows that glucose represents 50.6% of all monosaccharides, xylose 35.0%, arabinose 7.0% and galactose and mannose, respectively, 3.6% and 3.4%. Reproduction cork has a composition similar to virgin cork. For the cases studied, reproduction cork had however less extractives and a higher amount of suberin. Significant differences were found for the chemical composition of virgin cork in relation to location of extractives and polysaccharide content. The between-tree variability was large and a variation within the tree was also recorded.The author is grateful for the help of collaborators throughout the chemical analysis of the many samples: Joaquina Ferreira, A. Velez Marques, M. Lurdes Ferreira, Rosa Amorim and Célia Constâncio.The work was financially supported by the Instituto de Ciência e Tecnologia dos Materiais (ICTM), Lisbon, Portugal  相似文献   

Radial variation of vessel size and distribution in cork oak wood (<Emphasis Type="Italic">Quercus suber</Emphasis> L.)     

Sofia Leal  Vicelina B. Sousa  Helena Pereira 《Wood Science and Technology》2007,41(4):339-350

Quercus suber L. is an important species producing cork whose wood characteristics have not been investigated a lot. Cork oak wood vessels are a striking feature and the most abundant wood tissue largely influencing density and permeability. Vessel size and distribution were studied in approximately 40 year-old and never debarked cork oaks by continuously measuring along the radial direction in the transverse section of wood discs taken at 1.3 m of height using image analysis techniques. The vessel size increases with age from 7660 ± 2286 to 21136 ± 6119 μm², the conductive area from 5.4 ± 2.2 to 11.6 ± 3.9%, and the vessel density remains approximately constant between 5.2 ± 1.5 and 7.3 ± 3.5 vessels/mm². In comparison with ring-porous and some evergreen oaks, cork oaks show a similar conductive area but smaller vessels. Vessel architecture is known to play an important role on oaks tolerance to hydric stress, and these cork oak trees were growing under very harsh edaphoclimatic conditions, not tolerated by other oaks. The well-developed and deep root system allowing access to constant water supply may contribute to the cork oak’s relatively high conductive area.  相似文献   

Mechanisms of resistance/tolerance of Pyrus communis to Stemphylium vesicarium. A transcriptome analysis     

Vanessa Tolentino Pereira  Lisete Sousa  António Teixeira de Sousa  Maria Salomé Pais 《Agroforestry Systems》2015,89(6):991-1017

  相似文献   

Empirical models to predict LAI and aboveground biomass of Coffea arabica under full sun and shaded plantation: a case study of South of Minas Gerais,Brazil     

Priscila Pereira Coltri  Jurandir Zullo Junior  Vincent Dubreuil  Glaucia Miranda Ramirez  Hilton Silveira Pinto  Gustavo Coral  Camila Giorgi Lazarim 《Agroforestry Systems》2015,89(4):621-636

  相似文献   

Anatomical variation of teakwood from unmanaged mature plantations in East Timor     

Sofia Cardoso  Vicelina B. Sousa  Teresa Quilhó  Helena Pereira 《Journal of Wood Science》2015,61(3):326-333

  相似文献