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| Registros recuperados: 35 | |
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| Villamar, F.. |
| En el presente estudio se realiza un bioensayo para determinar el grado de concentración media letal del dispersante de petróleo BP 1100-WD, utilizando organismos vivos en condiciones de laboratorio. Se describe el método estadístico de Bliss. En definitiva el propósito de realizar bioensayos es la de comparar la toxicidad de diferentes compuestos y conocer la sensibilidad de las diversas especies, para determinar los mecanismos de los efectos de las sustancias ensayadas (Alcazar, 1988). |
| Tipo: Journal Contribution |
Palavras-chave: Bioassays; Toxicity; Larvae; Shrimp fisheries; Bioassays; Toxicity; Larvae. |
| Ano: 1990 |
URL: http://hdl.handle.net/1834/2164 |
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| Aguirre-Obando,Oscar Alexander; Pietrobon,Anna Julia; Bona,Ana Caroline Dalla; Navarro-Silva,Mário Antônio. |
| ABSTRACT After a dengue outbreak, the knowledge on the extent, distribution and mechanisms of insecticide resistance is essential for successful insecticide-based dengue control interventions. Therefore, we evaluated the potential changes to insecticide resistance in natural Aedes aegypti populations to Organophosphates (OP) and Pyrethroids (PY) after chemical vector control interventions. After a Dengue outbreak in 2010, A. aegypti mosquitoes from the urban area of Jacarezinho (Paraná, Brazil) were collected in 2011 and 2012. Insecticide resistance to OP Temephos was assessed in 2011 and 2012 by dose–response bioassays adopting WHO-based protocols. Additionally, in both sampling, PY resistance was also investigated by the Val1016Ile mutation genotyping.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioassays; Dengue; Insecticide resistance; Knockdown resistance; Pyrethroids; Temephos. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262016000100094 |
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| SILVA,M.S.A.; YAMASHITA,O.M.; ROSSI,A.A.B.; CONCENÇO,G.; CARVALHO,M.A.C.; FELITO,R.A.. |
| ABSTRACT: The monitoring of phytochemicals with potentially toxic properties can be assessed by observing the physiological and cellular alterations of the test organism exposed. This present study aimed to evaluate the cytotoxic and genotoxic potential of aqueous extracts of leaves and roots of Macroptilium lathyroides weed on the cell cycle of lettuce. Bioassays were conducted in a germinator (25 oC) with aqueous extract at concentrations of 0, 5, 10, 20 and 40% p v-1, obtained from fresh leaves and roots. For biological, lettuce root meristems were used for the preparation of slides using the technique of squashing. All blades were observed with an optical microscope at a magnitude of 400x. A total of 5,000 cells were analyzed for each treatment, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abnormalities; Bioassays; Cell division; Phasey bean; Mitotic index. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100244 |
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| Ferreira,Dinamarta V.; Cruz,Joseane S.; Sacramento,Jailton J.M.; Rocha,Marcos Leandro C.; Cristaldo,Paulo F.; Araújo,Ana Paula A.. |
| ABSTRACT Laboratory bioassays should be performed under appropriate conditions that minimize stress and promote greater longevity to tested animals. For social insects, for instance, the stress triggered by removal individuals from nests may result in changes in their survival and behavior. Here we analyzed the effects of variations of different combinations of temperature and substrate moisture (mL of water/g of nest substrate) on group survival of Constrictotermes sp. (Termitidae: Nasutitermitinae). In general, lower substrate moisture resulted in faster mortality. On the other hand, groups survival longer at a temperature of 26 ºC and under higher substrate moisture (2–3 mL/7 g of nest substrate). The result of this study may contribute to the... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Bioassays; Mortality; Termite. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262019000100009 |
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| Polanczyk,Ricardo Antonio; Silva,Rogério Fernando Pires da; Fiuza,Lidia Mariana. |
| The fall armyworm (Spodoptera frugiperda) is one of the most important pests of maize, causing up to 20% production losses when defoliation occurs near to flowering, or even complete destruction of plants. Among the alternatives to control this pest, the use of Bacillus thuringiensis (Bt) has gained attention due to its efficiency and low impact on natural enemies. Strains Bt dendrolimus HD 37, Bt aizawai HD 68, Bt kurstaki HD 73, Bt darmstadiensis HD 146, and Bt thuringiensis 4412 were tested against second instar larvae in in vivo assays. Suspensions of Bt aizawai HD 68 and Bt thuringiensis 4412, containing 3 x 10(8) cells/ml, induced mortality of 100% and 80.4%, respectively. To test virulence, cell concentrations of 8 x 10(5) to 3 x 10(8) cells/ml of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus thuringiensis; Spodoptera frugiperda; Biological control; Bioassays; Fall armyworm. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000300003 |
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| Passos,J.L.; Barbosa,L.C.A.; Demuner,A.J.; Barreto,R.W.; King-Diaz,B.; Lotina-Hennsen,B.. |
| The present study combines the examination of toxins produced by C. cassiicola and the effects of the fungus colonization on L. camara. C. cassiicola was cultivated on solid media and the crude extracts CAE and CE were produced. Both extracts were submitted to a seed germination and growth assay utilizing Physalis ixocarpa, Trifolium alexandrinum, Lolium multiflorum and Amaranthus hypochodriacus. The effect of the extracts on the ATP-synthesis in isolated spinach chloroplasts was also tested. Bioassay guided chromatographic fractionation identified the most active extract (CAE). From this extract ergosta-4,6,8(14),22-tetraen-3-one (C1) and fatty acids were isolated. The C1 compound reduce ATP synthesis in isolated spinach chloroplasts. The interference of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelopathy; Bioassays; Photosynthesis inhibitor; Phytotoxicity. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000200001 |
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| 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 & 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 |
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| Albarracín,I.; Pío, G.; Salomón, R.; Cravero, M.. |
| El hombre, en el afán de una agricultura más eficiente, permanentemente procura desarrollar productos plaguicidas, sin tener en cuenta que su uso indiscriminado provoca adaptaciones en plagas, tornándolas más resistentes. En el Valle Inferior del Río Chubut (VIRCH), provincia del Chubut, Argentina, los agricultores utilizan herbicidas organofosforados como el glifosato (sal isopropilamina del N-fosfonometil glicina), para el control de malezas en diversos cultivos, asumiendo el riesgo que implican las filtraciones en la calidad higiénico-sanitaria de sus aguas. Dado que las microalgas responden rápidamente a cambios ambientales debido a sus tiempos cortos de generación y a su papel como productores primarios en los ecosistemas acuáticos, se usan en ensayos... |
| Tipo: Journal Contribution |
Palavras-chave: Bioassays; Toxicity. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4629 |
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| Albarracín, I.; Pío, G.; Salomón, R.; Cravero, M.. |
| Los bioensayos con microalgas como bioindicadores de ecotoxicidad son útiles para evaluar el impacto ambiental provocado por las descargas de productos químicos y el vertido de efluentes. Siendo el fitoplancton el primer eslabón de la cadena trófica en los ecosistemas acuáticos, cualquier alteración de la composición de la comunidad microalgal, producto de estrés toxicológico, modifica la estructura y la función de todo el sistema. El Río Chubut, en Argentina, abastece de agua a varias localidades; se utiliza para el riego de superficies cultivadas y la generación de energía eléctrica. Su curso puede recibir filtraciones, impactando en la calidad higiénico-sanitaria de sus aguas. En el Valle Inferior del río Chubut (VIRCH) se utilizan diversos pesticidas... |
| Tipo: Preprint |
Palavras-chave: Bioassays; Bioassays; Http://aims.fao.org/aos/agrovoc/c_15731. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/3640 |
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| Aguirre-Obando,Oscar A.; Bona,Ana C. Dalla; Duque L.,Jonny E.; Navarro-Silva,Mário A.. |
| Mosquito control prevails as the most efficient method to protect humans from the dengue virus, despite recent efforts to find a vaccine for this disease. We evaluated insecticide resistance and genetic variability in natural populations of Aedes aegypti (Linnaeus, 1762) from Colombia. This is the first Colombian study examining kdr mutations and population structure. Bioassays with larvae of three mosquito populations (Armenia, Calarcá and Montenegro) were performed according to the World Health Organization (WHO) guidelines, using Temephos. For the analysis of the Val1016Ile mutation and genetic diversity, we sampled recently-emerged adults from four mosquito populations (Armenia, Calarcá, Montenegro and Barcelona). Following the WHO protocol, bioassays... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioassays; Gene flow; Knockdown resistance; Mitochondrial DNA; ND4 gene. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000100014 |
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| Registros recuperados: 35 | |
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