Ld50
Mostrando 25-36 de 562 artigos, teses e dissertações.
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25. Biology of Blepyrus clavicornis (Compere) (Hymenoptera: Encyrtidae), a parasitoid of Pseudococcus viburni (Signoret) (Hemiptera: Pseudococcidae)
Abstract Encyrtids (Hymenoptera: Encyrtidae) are the most important and diverse group of natural enemies of mealybugs (Hemiptera: Pseudococcidae). Blepyrus clavicornis (Compere) is the most common parasitoid associated with Pseudococcus viburni (Signoret) in the Serra Gaúcha region, Brazil. We conducted laboratory studies to assess the development time, sex
Rev. Bras. entomol.. Publicado em: 2017-09
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26. O USO DE BARRA OU HALTERE NÃO ALTERA A ATIVAÇÃO MUSCULAR DURANTE O EXERCÍCIO PULLOVER
RESUMO Introdução: Inúmeras variações de exercícios têm sido aplicadas nas rotinas de treinamento de força, com o objetivo de otimizar os ganhos de força e hipertrofia e, entre os exercícios usados, podemos destacar o pullover. Objetivo: Comparar a atividade eletromiográfica da parte clavicular do músculo peitoral maior (PMC), parte esternocost
Rev Bras Med Esporte. Publicado em: 2017-09
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27. Fluorescência da Clorofila em Brachiaria decumbens e Brachiaria ruziziensis Submetidas a Herbicidas
RESUMO A utilização de diferentes doses de herbicidas pode promover resposta fisiológica diferenciada em gramíneas do mesmo gênero. Este trabalho foi proposto com o objetivo de avaliar as respostas fisiológicas de B. ruziziensis e B. decumbens submetidas aos herbicidas glyphosate e fluazifop-p-butyl. Os tratamentos foram arranjados no esquema fatorial
Planta daninha. Publicado em: 07/08/2017
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28. Chemical composition, antioxidant and antibacterial activities of essential oils from leaves and flowers of Eugenia klotzschiana Berg (Myrtaceae)
ABSTRACT Many essential oils (EOs) of different plant species possess interesting antimicrobial effects on buccal bacteria and antioxidant properties. Eugenia klotzschiana Berg (pêra-do-cerrado, in Portuguese) is a species of Myrtaceae with restricted distribution in the Cerrado. The essential oils were extracted through the hydrodistillation technique usin
An. Acad. Bras. Ciênc.. Publicado em: 31/07/2017
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29. Preparation and neutralization efficacy of IgY antibodies raised against Deinagkistrodon acutus venom
Abstract Background The five-paced pit viper (Deinagkistrodon acutus), endemic to China and northern Vietnam, is responsible for most snakebites in the Chinese territory. Antivenom produced from horses is the main treatment for snakebites, but it may cause numerous clinical side effects and have other disadvantages involved in their production such as the
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 06/07/2017
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30. The Review of Certain In Vivo Antioxidant Effects on Essential Oils of Origanum Minutiflorum O Schwarz-Ph Davis, Juniperus Excelsa Bieb.subsp. Excelsa and Histopathologic Changes
ABSTRACT Essential oil of plants called Juniperus excelsa Bieb. (JE), Origanum minutiflorum O. Schwarz and P.H. Davis (OM) were used in this study. In order to determine experimental doses, LD50 values of essential oils were determined on mice. Taking into consideration the LD30 range, the experimental toxic doses were calculated for each rat (rat/kg). The t
Rev. Bras. Cienc. Avic.. Publicado em: 2017-06
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31. Antispasmodic activity from Serjania caracasana fractions and their safety
Abstract In a previous study, we reported the antispasmodic and gastroprotective effects of the Serjania caracasana (Jacq.) Willd., Sapindaceae, extract. In the present study, we evaluated the LD50, hemolytic and antispasmodic activities of its fractions and characterized its major constituents by isolation and GC–MS. The animals showed non-toxic symptoms
Rev. bras. farmacogn.. Publicado em: 2017-06
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32. Nutritional and microbiological quality of bovine colostrum samples in Brazil
ABSTRACT The objective of this study was to evaluate the nutritional and microbiological composition of colostrum samples collected from colostrum banks or newly calved cows on dairy farms. For this purpose, 66 colostrum samples from dairy cows were directly collected during the milking of newly calved cows or from colostrum storage bank. Samples were collec
R. Bras. Zootec.. Publicado em: 2017-01
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33. Avaliação de Erva-Cabecinha (Phalaris minor) Resistente a Fenoxaprop-P-Ethyl no Paquistão
RESUMO A fim de testar o status de resistência de Phalaris minor (erva-cabecinha) ao fenoxaprop-p-ethyl no Paquistão, uma pesquisa de campo foi realizada durante o ano de 2014. Plantas de P. minor sem controle foram selecionadas para coleta das sementes em campos de trigo em que o fenoxaprop-p-ethyl havia sido usado para controle de P. minor. As sementes f
Planta daninha. Publicado em: 2016-12
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34. Toxicity and antitumor efficacy of Croton polyandrus oil against Ehrlich ascites carcinoma cells
ABSTRACT The essential oil from Croton polyandrus Spreng., Euphorbiaceae, leaves was tested for the toxicity and antitumor activity. The concentration producing 50% hemolysis was 141 µg/ml on mice erythrocytes. In the acute toxicological study, the estimated LD50 was 447.18 mg/kg. The essential oil did not induce increase in number of micronucleated erythro
Rev. bras. farmacogn.. Publicado em: 2016-12
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35. CARCINOGENICIDADE DE HIDROCARBONETOS POLICÍCLICOS AROMÁTICOS
The assessment of the carcinogenic potential of polycyclic aromatic hydrocarbons (PAH) is obtained by a principal component analysis (PCA) and quantitative structure-activity relationship (QSAR) using hydrophobic (LogP), stereo and electronic parameters (electron affinity, dipole moment and HOMO-LUMO gap) calculated from the AM1 method. The PAH-DNA interacti
Quím. Nova. Publicado em: 2016-08
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36. Sida tuberculata (Malvaceae): a study based on development of extractive system and in silico and in vitro properties
Sida tuberculata (Malvaceae) is a medicinal plant traditionally used in Brazil as an antimicrobial and anti-inflammatory agent. Here, we aimed to investigate the different extractive techniques on phytochemical parameters, as well as to evaluate the toxicity and antioxidant capacity of S. tuberculata extracts using in silico and in vitro models. Therefore, i
Braz J Med Biol Res. Publicado em: 11/07/2016