Consulta: subjectFacets:"Fumigation"
Registros recuperados: 6
Data/hora: 03/06/2024 10:11:39

Biomassa microbiana do solo.
Provedor de dados: 14
Autores: REIS JÚNIOR, F. B. dos; MENDES, I. de C.
ABSTRACT: The microbial biomass, respiration and their derivative indexes are proposed as indicators of the state and changes of the soil organic matter. This document presents basic information about these indicators and the two methodologies most used for C-microbial biomass determinations, the fumigation-incubation and the fumigation-extraction methods. The basic principles behind these methods, advantages, disadvantages and limitations are discussed. As then main objective of this review, recent results from research in this field developed at the Embrapa Cerrados are presented.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Microbial flora; Incubation.; Biomassa; Carbono; Fumigação; Incubação; Microbiologia do Solo; População Microbiana.; Biomass; Fumigation; Microbiology; Soil.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572256

Potential of antimicrobial volatile organic compounds to control Sclerotinia sclerotiorum in bean seeds
Provedor de dados: 86
Autores: Fialho,Maurício Batista; Moraes,Maria Heloisa Duarte de; Tremocoldi,Annelise Roberta; Pascholati,Sérgio Florentino.
The objective of this work was to evaluate the potential of an artificial mixture of volatile organic compounds (VOCs), produced by Saccharomyces cerevisiae, to control Sclerotinia sclerotiorum in vitro and in bean seeds. The phytopathogenic fungus was exposed, in polystyrene plates, to an artificial atmosphere containing a mixture of six VOCs formed by alcohols (ethanol, 3-methyl-1-butanol, 2-methyl-1-butanol and phenylethyl alcohol) and esters (ethyl acetate and ethyl octanoate), in the proportions found in the atmosphere naturally produced by yeast. Bean seeds artificially contamined with the pathogen were fumigated with the mixture of VOCs in sealed glass flasks for four and seven days. In the in vitro assays, the compounds 2-methyl-1-butanol and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Alternative control; Fumigation; White mold; Yeast.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000200004

Comparison of methods to quantify soil microbial biomass carbon
Provedor de dados: 1
Autores: Moura, Rafael Thomaz de Aquino; Carrido, Marlon da Silva; Sousa, Carla da Silva; Menezes, Rômulo Simões Cezar; Sampaio, Everardo Valadares de Sá Barretto.
 Soil microorganism biomass is an important soil quality indicator. The microbial biomass of soil was determined by killing and lysing the soil microbes by fumigation with chloroform, irradiation with gamma rays, or irradiation with microwaves. Four soils with increasing carbon concentrations (5, 10, 15, and 30 g kg-1) were analyzed using four methods: the direct application of chloroform, chloroform fumigation, microwave irradiation, and gamma ray irradiation with radiation doses of 15, 25, 35, 45, and 60 KGy. The fungi and bacteria in the soil were quantified by plate counting. Microwave irradiation and gamma irradiation with doses equal to or above 25 KGy killed all the soil microorganisms, but the chloroform methods did not. The carbon liberation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agronomia  ciência do solo microwave; Gamma irradiation; Fumigation; Incubation; Microbial carbon. biomassa microbiana do solo.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39451

Comparison of methods to quantify soil microbial biomass carbon
Provedor de dados: 1
Autores: Moura, Rafael Thomaz de Aquino; Carrido, Marlon da Silva; Sousa, Carla da Silva; Menezes, Rômulo Simões Cezar; Sampaio, Everardo Valadares de Sá Barretto.
 Soil microorganism biomass is an important soil quality indicator. The microbial biomass of soil was determined by killing and lysing the soil microbes by fumigation with chloroform, irradiation with gamma rays, or irradiation with microwaves. Four soils with increasing carbon concentrations (5, 10, 15, and 30 g kg-1) were analyzed using four methods: the direct application of chloroform, chloroform fumigation, microwave irradiation, and gamma ray irradiation with radiation doses of 15, 25, 35, 45, and 60 KGy. The fungi and bacteria in the soil were quantified by plate counting. Microwave irradiation and gamma irradiation with doses equal to or above 25 KGy killed all the soil microorganisms, but the chloroform methods did not. The carbon liberation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microwave; Gamma irradiation; Fumigation; Incubation; Microbial carbon.; Biomassa microbiana do solo.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39451

Chemical Constituents and Toxicity of Essential Oils of Oriental Arborvitae, Platycladus orientalis (L.) Franco, against Three Stored-Product Beetles
Provedor de dados: 117
Autores: Mehdi Hashemi,Seyed; Ali Safavi,Seyed.
Plant secondary metabolites play an important role in plant-insect interactions and therefore such compounds may have insecticidal or biological activity against insects. Fumigant toxicity of essential oils of leaves and fruits from oriental arborvitae (Platycladus orientalis (L.) Franco) (Cupressaceae) was investigated against adults of cowpea weevil (Callosobruchus maculatus Fab.), rice weevil (Sitophilus oryzae L.), and red flour beetle (Tribolium castaneum Herbst). Fresh leaves and fruits were subjected to hydrodistillation using a Clevenger-type apparatus and the chemical composition of the volatile oils was studied by gas chromatography-mass spectrometry (GC-MS). Twenty-six compounds (92.9%) and 23 constituents (97.8%) were identified in the leaf and...
Tipo: Journal article
Palavras-chave: Botanical insecticides; Fumigation; Stored-product insects.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200004

Chemical constituents and toxicity of Agastache foeniculum (Pursh) kuntze essential oil against two stored-product insect pests
Provedor de dados: 117
Autores: Ebadollahi,Asgar.
The uncontrolled use of synthetic insecticides is a great hazard for the environment and consumers. Essential oils were introduced as low toxic agents against mammals and non-targeted insects. In this study, essential oil from aerial parts of blue giant hyssop (Agastache foeniculum [Pursh] Kuntze) (Lamiaceae) was isolated by the water steam distillation method with a Clevenger apparatus, and its chemical composition was studied by gas chromatography mass spectrometry. The toxicity of A. foeniculum essential oil against red flour beetle, Tribolium castaneum (Herbst), and lesser grain borer Rhyzopertha dominica (F.) was evaluated by fumigation at 24, 48, and 72 h exposure times. Estragole and 1,8-cineole were identified as major constituents of the A....
Tipo: Journal article
Palavras-chave: Blue giant hyssop; Fumigation.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200005