Consulta: subjectFacets:"LC50"
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ประสิทธิภาพของสารเคมีป้องกันกำจัดแมลงกลุ่มใหม่ในการควบคุม เพลี้ยกระโดดสีน้ำตาล (Brown Planthopper, Nilaparvata lugens (Stål)) และผลกระทบต่อมวนเขียวดูดไข่ (Mirid bug , Cyrtorhinus lividipennis Reuter)
Provedor de dados: 106
Autores: Sukanya Arunmit; Wantana Sriratanasak; Jintana Chaiwong.
Brown planthopper (BPH), Nilaparvatar lugens (Stål) is an important insect pest of irrigated rice cultivation areas in lower north, central and northeast Thailand. The field experiments were conducted to evaluate the efficacy of nine insecticides include buprofezin 25% WP, buprofezin 5% + isoprocarb 20% WP, etofenprox 20% EC, ethiprole 10% SC, dinotefuran 10% WP, pymetrozine 50% WG, sulfoxaflor 50% WG, carbosulfan 20% EC and clothianidin 16% SG to control BPH in farmers’ fields at Suphan Buri, Nakhon Nayok and Ubon Ratchathani provinces. The results showed that the sulfoxaflor 50% WG and pymetrozine 50% WG which are new class insecticides, were the most effective insecticides that showed BPH control efficacy of 40-80% whilst the other insecticides which...
Tipo: PhysicalObject
Palavras-chave: Sulfoxaflor; Pymetrozine; New class insecticide; Brown planthopper; Mirid bug; Toxicity value; LC50; สารเคมีป้องกันกำจัดแมลง; เพลี้ยกระโดดสีน้ำตาล; มวนเขียวดูดไข่; ค่าความเป็นพิษ; LC50.
Ano: 2015
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5956

Sensitivity of aquatic organisms to ethanol and its potential use as bioindicators
Provedor de dados: 3
Autores: Silva, Adilson Ferreira; Cruz, Claudinei da; Garlich, Nathalia; Cerveira Junior, Wilson Roberto; Pitelli, Robinson Antonio.
The aim of this research was to evaluate the feasibility for the use of the organisms Lemna minor, Azolla caroliniana, Hyphessobrycon eques, Pomacea canaliculata and Daphnia magna as exposure bioindicators for ethanol (lethal and effective concentration 50% - LC50(I)/EC50(I)). Thus, the following concentrations were used 5.0; 10.0; 20.0; 30.0; 40.0 and 50.0 mg L-1 ethanol on L. minor; 25.0; 50.0; 75.0; 100.0; 150.0 and 200.0 mg L-1 on A. caroliniana; 0.3; 0.5; 1.0; 2.0 and 3.0 mg L-1 on H. eques; 0.05; 0.10; 0.20; 0.40 and 0.80 mg L-1 on P. canaliculata; and 40.0; 60.0; 80.0; 100.0; 120.0 and 140.0 mg L-1 on D. magna. An untreated control was also kept for all organisms, with three repetitions. The increase in the ethanol concentration elevated the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Recursos pesqueiros e pesca environmental impact; LC50; Ecology ecotoxicologia sentinel organisms  environmental impact  ecology Ecotoxicologia.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/28946

Acute toxicity of azadirachtin to a teleost, Heteropneustes fossilis - doi: 10.4025/actascibiolsci.v34i2.9455
Provedor de dados: 3
Autores: Kumar, Abhishek; DDU Gorakhpur University - India; Prasad, ManiRam; DDU Gorakhpur University - India; Mishra, Diwakar; DDU Gorakhpur University - India; Srivastav, Sunil Kumar; DDU Gorakhpur University - India; Srivastav, Ajai Kumar; DDU Gorakhpur University - India.
The acute static renewal test of a botanical pesticide - azadirachtin for the freshwater catfish, Heteropneustes fossilis has been performed to determine the LC50 values at different exposure period. The LC50 values at various exposure periods are 173.06 mg L-1 for 24h; 80.69 mg L-1 for 48h; 58.57 mg L-1 for 72h and 52.35 mg L-1 for 96h. The upper confidence limits were 196.87, 86.91, 79.20 and 70.04 mg L-1 for 24, 48, 72 and 96 h and lower confidence limits were 154.01, 74.24, 37.33 and 33.83 mg L-1, respectively. These results indicate that azadirachtin exposure to the fish caused toxic effects.
Palavras-chave: Neem; Azadirachtin; LC50; Heteropneustes fossilis; Fish Animal Morphology and Physiology; Toxicology Neem  azadirachtin; LC50; Heteropneustes fossilis; Fish.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/9455

Cytotoxic and genotoxic potential of industrialized powdered milk for infants and young children
Provedor de dados: 3
Autores: Silva, Geysa Janne Sousa; Santos, Fabelina Karollyne Silva dos; Marques, Márcia Maria Mendes; Peron, Ana Paula.
This study aimed to evaluate the cytotoxicity and genotoxicity and determine the LC50 concentration of powdered infant formulas widely marketed in South American countries. To this, milk samples, called as A, B, C and D, were analyzed in root meristem cells of Allium cepa, at concentrations of 0.075; 0.15 and 0.30 g mL-1, for 24 and 48 hours; and through cell viability in culture of normal line cells, via MTT test, for 24 hours, in the concentrations 0.018; 0.0375; 0.075 and 0.15 g mL-1. In A. cepa, all dairy products in the three concentrations caused significant inhibition of cell division in the meristems within the first 24 hours of exposure. In the in vitro evaluation, all milk formulas at 0.15 g mL-1, as well as milk A at a concentration of 0.037 g...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Infant formula; Cell division; Meristematic tissue; Cell viability; LC50.
Ano: 2020
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/46856

Acute Toxicity Of Euphorbia Royleana Boiss (Euphorbiaceae) latex on freshwater catfish, Heteropneustes Fossilis (Siluriformes, Heteropneustidae)
Provedor de dados: 40
Autores: ManiRam,Prasad; Abhishek,Kumar; Diwakar,Mishra; Sunil K,Srivastav; Ajai K,Srivastav.
An acute toxicity test was performed by using a four-day static renewal test to determine the LC50 value of aqueous extract of Euphorbia royleana latex for the freshwater fsh, Heteropneustes fossilis. The LC50 values, their upper and lower confdence limits and slope functions were calculated. The LC50 values for aqueous extract of Euphorbia royleana latex at various exposure periods were 7.758 mg/L for 24 h, 5.847 mg/L for 48 h, 4.474 mg/L for 72 h and 3.090 mg/L for 96 h. The regression coeffcient showed that there was signifcant negative correlation between exposure time and different LC values. Hence, it is concluded that the concentration to produce toxicity of latex of Euphorbia royleana is comparable and close to the concentration to produce toxicity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Euphorbia royleana; Toxicity; LC50.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-37432010000100001

Evaluation of Insecticide Activity of Two Agricultural Detergents against the Long-Tailed Mealybug, Pseudococcus longispinus (Hemiptera: Pseudococcidae), in the Laboratory
Provedor de dados: 113
Autores: Curkovic,Tomislav; Burett,Gary; Araya,Jaime E.
The insecticide effect of agricultural detergents SU 120 and Tecsa Fruta was evaluated on females and nymphs II of Pseudococcus longispinus (Targioni &amp;amp; Tozzetti) in the laboratory. Mortality at 24 h was subjected to Probit analysis to obtain the LC50. For Tecsa Fruta, a volume of 9.5 mL solution was sprayed, while for SU 120, volumes of 2, 4, and 8 mL 100 mL-1 solution were evaluated. Mortality was directly related to the concentration used. Nymphs II were more susceptible than females to both detergents. LC50 for Tecsa Fruta were 17.9 mL 100 mL-1 for females, and 5.4 mL 100 mL-1 for nymphs II, whereas for SU 120 they were 3.1, 1.6, and 1.9 mL 100 mL-1 on females, and 0.8, 0.5, and 0.5 mL 100 mL-1 (with 2, 4, and 8 mL, respectively) on nymphs II....
Tipo: Journal article
Palavras-chave: Agricultural detergents; Bioassays; LC50; SU 120; Tecsa Fruta.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400010

Comparative acute toxicity of gallium(III), antimony(III), indium(III), cadmium(II), and copper(II) on freshwater swamp shrimp (Macrobrachium nipponense)
Provedor de dados: 48
Autores: Yang,Jen-Lee.
BACKGROUND: Acute toxicity testing were carried out the freshwater swamp shrimp, Macrobrachium nipponense, as the model animal for the semiconductor applied metals (gallium, antimony, indium, cadmium, and copper) to evaluate if the species is an suitable experimental animal of pollution in aquatic ecosystem. RESULTS: The static renewal test method of acute lethal concentrations determination was used, and water temperature was maintained at 24.0&amp;#8201;±&amp;#8201;0.5°C. Data of individual metal obtained from acute toxicity tests were determined using probit analysis method. The median lethal concentration (96-h LC50) of gallium, antimony, indium, cadmium, and copper for M. nipponense were estimated as 2.7742, 1.9626, 6.8938, 0.0539, and 0.0313 mg/L,...
Tipo: Journal article
Palavras-chave: Macroburachium nipponense; Cu; Cd; Sb; Ga; In; LC50.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100013

Acute toxicity test of agricultural pesticides on silver catfish (Rhamdia quelen) fingerlings
Provedor de dados: 65
Autores: Kreutz,Luiz Carlos; Barcellos,Leonardo José Gil; Silva,Tális Oliveira; Anziliero,Deniz; Martins,Daiana; Lorenson,Monique; Marteninghe,Ariane; Silva,Leonardo Bolognese da.
Toxicity risks of agricultural pesticides to fishes are pivotal. Currently, many questions remain unsolved regarding to the toxicity of commonly used pesticides to silver catfish (Rhamdia quelen), a South American catfish. The present studies have been designed to investigate the acute toxicity and the lethal concentration (LC50) of four herbicides, two fungicides and two insecticides to silver catfish fingerlings. All experiments were carried out in triplicates, in a static bioassay system, using commercially available pesticides. The data was analyzed through the Trimmed Spearman-Karber method available from the Environmental Protection Agency. The 96hLC50 and 95% lower and upper confidence limits, respectively, for the following pesticides were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioassay; Toxicity; Pesticides; LC50; Rhamdia quelen.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000400022

Lethal concentration of clomazone, metsulfuron-metil, and quinclorac for silver catfish, Rhamdia quelen, fingerlings
Provedor de dados: 65
Autores: Miron,Denise dos Santos; Silva,Lenise Vargas Flores da; Golombieski,Jaqueline Ineu; Machado,Sérgio Luiz de Oliveira; Marchezan,Enio; Baldisserotto,Bernardo.
The goal of the present work was to determine the lethal concentration (LC50) (96h) of clomazone, metsulfuron-methyl, and quinclorac, herbicides used in rice culture, for the silver catfish, Rhamdia quelen. Fingerlings were exposed to different concentrations of the herbicides. The LC50s were 7.32µL L-1 for clomazone and 395mg L-1 for quinclorac. The LC50 for metsulfuron-methyl was not obtained since all fingerlings survived even at 1200mgL-1. Probably only clomazone can lead to mortality among silver catfish reared in the rice culture system.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quinclorac; Clomazone; Metsulfuron-menthyl; Rhamdia quelen; Silver catfish; LC50.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000500021

Acute toxicity of nitrite to matrinxã, Brycon cephalus (Günther, 1869), (Teleostei-Characidae)
Provedor de dados: 65
Autores: Avilez,Ive Marchioni; Aguiar,Lucia Helena de; Altran,Alexandre Eneas; Moraes,Gilberto.
Nitrite leads to many physiological and hematological disturbances followed by lethality. This work reports the lethal concentration of nitrite to juvenile matrinxã. Experiments were done at 24ºC, pH 6.7-7.0 under natural photoperiod. Fish were exposed to 0.2- 0.5- 1.0 and 2.0mg L-1 of nitrite N-NO2 for 96h. The 96-h LC50 of nitrite-N was calculated by the trimmed Spearman-Karber method (0.86±0.05mg L-1; 0.57-1.30 to 95%CI) and it was concluded that matrinxã is very sensitive to environmental nitrite. Therefore, care must be taken to prevent accumulation of nitrite in intensive culture systems of matrinxã.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LC50; Nitrite; Matrinxã; Brycon cephalus; Toxicity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000600013