Lethal Toxicity
Mostrando 25-36 de 424 artigos, teses e dissertações.
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25. Cytolytic and systemic toxic effects induced by the aqueous extract of the fire coral Millepora alcicornis collected in the Mexican Caribbean and detection of two types of cytolisins
AbstractBackground Millepora alcicornis is a branching hydrocoral common throughout the Caribbean Sea. Like other members of this genus, this species is capable of inducing skin eruptions and blisters with severe pain after contact. In the present study, we investigated the toxicity of theM. alcicornis aqueous extract on several animal models. Considering th
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 20/10/2015
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26. Pharmacological characterization of venoms from three theraphosid spiders: Poecilotheria regalis, Ceratogyrus darlingi and Brachypelma epicureanum
Abstract Background Tarantulas (Theraphosidae) represent an important source of novel biologically active compounds that target a variety of ion channels and cell receptors in both insects and mammals. In this study, we evaluate and compare the pharmacological activity of venoms from three taxonomically different theraphos
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 11/08/2015
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27. CONSTITUINTES QUÍMICOS E ATIVIDADE FITOTÓXICA DAS FOLHAS DE
Annona nutans The phytochemical investigation and evaluation of the phytotoxic effect of the extract and fractions obtained from the leaves of
Annona nutans (R. E. Fr.) R. E. Fr. were performed. Phytotoxic activity was assessed on radicle and hypocotyl ofAllium cepa andLactuca sativa , where chloroform and ethyl acetatQuím. Nova. Publicado em: 2015-06
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28. Acute copper toxicity in juvenile fat snook Centropomus parallelus (Teleostei: Centropomidae) in sea water
Três experimentos foram realizados para avaliar o acúmulo e toxicidade aguda do cobre (Cu) em juvenis de robalo-peva Centropomus parallelus. O primeiro experimento foi realizado para determinar a concentração letal (96h-CL50) de Cu. O segundo experimento foi realizado para avaliar os efeitos de concentrações subletais de Cu (0,47 e 0,94 mg/L), enquanto
Neotrop. ichthyol.. Publicado em: 11/11/2014
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29. Hepatic Cytochrome P450 as Biomarkers of Cypermethrin Toxicity in Freshwater Teleost, Channa punctatus (Bloch)
In this study, Channa punctatus was treated with sub-lethal concentration of cypermethrin (6.6 µg/L) for 5, 10 and 15 days and its effect on total CYP 450 and the activity of hepatic CYP450 isoforms measured. Total CYP450 content and CYP1A mediated EROD activity was significantly induced (p<0.05) in all three treated groups compared to control whereas only
Braz. arch. biol. technol.. Publicado em: 29/08/2014
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30. Cathepsin B/X is secreted by Echinometra lucunter sea urchin spines, a structure rich in granular cells and toxins
Background Echinometra lucunter is a common American sea urchin responsible for the majority of the marine accidents in Brazil. Although not lethal, these accidents are reported to be extremely painful. Recently, our group described the presence of toxins in its spines that contribute to the pathological reactions. Additionally, we have observed that the E.
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 16/12/2013
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31. Resistance to cyanide by salicylate pretreatment in Salix babylonica L.
Cyanide is uncontrollably produced in some industrial operations and has lethal effects on humans and the environment. Since removing processes of cyanide are complicated and costly, the phytoremediation has recently been extensively considered. To achieve an increased cyanide resistance, which is needed for an efficient phytoremediation of the mediums with
Theor. Exp. Plant Physiol.. Publicado em: 2013-12
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32. Effects of the European hornet ( Vespa crabro Linnaeus 1761) crude venom on its own species
Background Lethal dose 50% is a classical index of toxicity that usually employs small rodents as experimental animals. Therefore, scarce data are available on the effects of venom on invertebrates, particularly the impact of wasp venom on its own species. Findings In the present study, the lethality of Vespa crabro venom on its own species was studied. Let
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 18/03/2013
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33. The effect of Ageratum fastigiatum extract on Rhodnius nasutus, vector of Chagas disease
Control of Chagas disease is based on insecticide spraying in domiciles in order to exterminate triatomine populations. However, since the vectors differ in susceptibility to currently used insecticides, the screening of the toxic potential of Brazilian flora may identify new molecules lethal to triatomines. This study evaluated the toxicity of ethanolic ext
Rev. bras. farmacogn.. Publicado em: 04/12/2012
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34. Chemical constituents and evaluation of cytotoxic and antifungal activity of Lantana camara essential oils
The essential oil (EO) of aerial parts of Lantana camara L., Verbenaceae, from Simões, Piaui, Northeast of Brazil, were obtained by hydrodistillation and analyzed by GC-FID and GC-MS techniques. In total, 68 compounds were identified. The most representative compounds of the oil were mono and sesquiterpenes. The main compounds found in the oil of the leaves
Rev. bras. farmacogn.. Publicado em: 23/08/2012
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35. Toxicity of non-pyrethroid insecticides against Triatoma infestans (Hemiptera: Reduviidae)
Triatoma infestans (Klug) is the main vector of Chagas disease, which is a public health concern in most Latin American countries. The prevention of Chagas disease is based on the chemical control of the vector using pyrethroid insecticides. In the last decade, different levels of deltamethrin resistance have been detected in certain areas of Argentina and B
Memórias do Instituto Oswaldo Cruz. Publicado em: 2012-08
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36. The combined action of phytolarvicides for the control of dengue fever vector, Aedes aegypti
Amongst other botanical sources, Annona muricata L., Annonaceae, seeds and Piper nigrum L., Piperaceae, fruits are particularly enriched with acetogenins and piperine-related amides, respectively. These crude ethanolic extracts are potent Aedes aegypti bioactives that can kill Aedes aegypti larvae (dengue fever mosquito). A. muricata displayed a 93.48 µg/mL
Revista Brasileira de Farmacognosia. Publicado em: 2012