Consulta: subjectFacets:"Biological assay"
Registros recuperados: 3
Data/hora: 16/06/2024 06:40:40

Resistência natural da madeira de Tachigali vulgaris ao fungo xilófago Postia placenta
Provedor de dados: 190
Autores: Stallbaun, Patricia Hellenn; Baraúna, Edy Eime Pereira; Monteiro, Thiago Campos; Vieira, Renato Silva; Sales, Nilza De Lima Pereira; Oliveira, Leandro Silva.
O trabalho teve como objetivo analisar a resistência natural da madeira de Tachigali vulgaris L. G. Silva &amp; H. C. Lima ao fungo Postia placenta (Fr.) M. J. Lars. &amp; Lomb., causador da podridão parda. Foram coletadas nove árvores e, da tora basal, confeccionadas seis amostras de cada indivíduo, com dimensões de 25 mm x 25 mm x 9 mm (radial, tangencial e axial) no sentido base ao topo. As amostras foram mantidas em contato com o fungo durante 14 semanas, em sala climatizada, sendo posteriormente secas e a perda de massa avaliada. A madeira de T. vulgaris se mostrou altamente resistente a P. placenta, pois o maior valor de perda de massa foi de 12,13%. Foi observada correlação indireta de 82,9% entre a densidade básica e a durabilidade da madeira,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Engenharia Florestal; Tecnologia da madeira Podridão da madeira; Preservação da madeira; Ensaio biológico Wood decay; Wood preservation; Biological assay.
Ano: 2016
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1231

TOXIC ACTIVITY OF PYRETHROIDS IN Lutzomyia longipalpis (DIPTERA: PSYCHODIDAE) FROM MAGDALENA RIVER BASIN, COLOMBIA
Provedor de dados: 37
Autores: SANTAMARIA,Erika; MARCELÓ,Catalina.
ABSTRACT The study aimed to determine the toxicity of lambda-cyhalothrin, alpha-cypermethrin, and deltamethrin in L. longipalpis, through concentration-mortality bioassays. The test here was performed following WHO guidelines, but instead of using exposure WHO recipients and impregnated papers, 250 ml Wheaton glass bottles treated with 1 ml of insecticide solution were used. Batches of ten females of L. longipalpis were exposed to five concentrations of each pyrethroid that caused between 5 and 100 % mortality in this species. After 1 h of exposure, the females were transferred to observation recipients, and mortality was recorded 24 h later. The lethal concentrations (g/ml) that killed 50 and 95 % (LC50 and LC95) of the exposed L. longipalpis females were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological assay; Colombia; Insecticides; Leishmaniasis; Psychodidae.
Ano: 2019
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2019000200391

Active polyketides isolated from Penicillium herquei
Provedor de dados: 42
Autores: MARINHO,ANDREY M.R.; MARINHO,PATRÍCIA S.B.; SANTOS,LOURIVALDO S.; RODRIGUES FILHO,EDSON; FERREIRA,IZABEL C.P.
In this work we are reporting the isolation by classical methods of chromatography of six polyketides from Penicillium herquei. The compounds citreorosein ( 1) , emodin ( 2) , janthinone ( 3) , citrinin ( 4) , citrinin H1 ( 5) and dicitrinol ( 6) were identified by spectral methods of 1D and 2D NMR and MS. Compounds 1, 2 and 3 were tested against promastigotes forms of Leishmania brasiliensis and 1 and 2 were also assayed against Escherichia coli, Pseudomonas aeruginosa and Bacillus subtilis and showed good activity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyketides; Biological assay; P. herquei.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300909