Organotin Compounds
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Estudo do imposex em muricÃdeos do gÃnero Stramonita (Mollusca: Gastropoda) no Nordeste do Brasil / Imposex in muricÃdeos study of the genus Stramonita (Mollusca: Gastropoda) in northeastern Brazil
Imposex consists of a superimposition of male sexual characteristics in female prosobranch molluscs exposed to organotin compounds (OCs) contamination. This contamination is caused by biocides present in antifouling paints used on boats all over the world. Since imposex leads to measurable characters, those have been used for biological-effect monitoring of
Publicado em: 2005
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14. Imposex in Thais rustica (Mollusca: Neogastropoda) (Lamark, 1822) as an indicator of organotin compounds pollution at Maceio coast (Northeastern Brazil)
O uso de COE (compostos orgânicos de estanho) como biocida em tintas antiincrustantes para embarcações causa impactos em organismos não-alvos. Um destes impactos é a síndrome chamada imposex, em moluscos gastrópodos. Imposex é a imposição de caracteres sexuais secundários masculinos em fêmeas de gastrópodos como resultado de desregulação endó
Brazilian Journal of Oceanography. Publicado em: 2004-06
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15. Contaminação ambiental por compostos organoestânicos
The occurrence and the effects of organotin compounds (OTs) have been studied since a long time, due to their widespread use and deleterious effects. Some OTs are used as pesticides in crops, or as biocides in antifouling paints, applied in the ship hulls to avoid attachment and growth of tube worms, mussels and barnacles. However, "nontarget" organisms may
Química Nova. Publicado em: 2003-10
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16. GEOCRONOLOGIA DE COMPOSTOS ORGÂNICOS DE ESTANHO E DE ALGUNS METAIS DE RELEVÂNCIA AMBIENTAL ESTUDO DE CASO: BAÍA DE GUANABARA / GEOCHRONOLOGY OF ORGANOTIN COMPOUNDS AND OF SOME ENVIRONMENTALLY RELEVANT METALS CASE STUDY: GUANABARA BAY
O presente trabalho visou estudar a geocronologia da contaminação na Baía de Guanabara por compostos orgânicos de estanho e alguns metais de relevância ambiental. Foram coletados testemunhos sedimentares em cinco pontos da Baía de Guanabara em regiões não afetadas diretamente por fontes de contaminação conhecidas. Os trinta primeiros centímetros d
Publicado em: 2003
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17. Sintese formal enantiosseletiva do (-)-disidiolidio e outros estudos sinteticos envolvendo vinilcicloexenos
With the present research work we envisaged both the preparation and the application of vinylcyclohexene-type dienes as pivotal intermediates in synthetic pathways aiming the preparation of natural products (terpenoids) possessing bicyclic, partially-rearranged skeletons. Convergent construction of the decalin framework was turned to the Diels-Alder reaction
Publicado em: 2000
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18. Pattern of organotin inhibition of methanogenic bacteria.
Seven organotin compounds and tin chloride were tested for their effects on the methanogenic bacteria Methanococcus thermolithotrophicus, Methanococcus deltae delta LH, and Methanosarcina barkeri 227. The methanogens were strongly inhibited by triethyltin, tripropyltin, and monophenyltin compounds, generally at concentrations below 0.05 mM. Less inhibition b
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19. Effect of organotins on fecal pollution indicator organisms.
Pure cultures of Escherichia coli and Streptococcus faecalis and environmental water samples were examined for the possibility that pollution involving organotin compounds could decrease the values for indicator organisms when standard methods were applied to the analysis of water samples. (CH3)2SnCl2 and (CH3)3SnCl decreased viable counts at about 10 to 100
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20. Tin-Carbon Cleavage of Organotin Compounds by Pyoverdine from Pseudomonas chlororaphis
The triphenyltin (TPT)-degrading bacterium Pseudomonas chlororaphis CNR15 produces extracellular yellow substances to degrade TPT. Three substances (F-I, F-IIa, and F-IIb) were purified, and their structural and catalytic properties were characterized. The primary structure of F-I was established using two-dimensional nuclear magnetic resonance techniques; t
American Society for Microbiology.
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21. The ion channel of F-ATP synthase is the target of toxic organotin compounds
ATP is the universal energy currency of living cells, and the majority of it is synthesized by the F1F0 ATP synthase. Inhibitors of this enzyme are therefore potentially detrimental for all life forms. Tributyltin chloride (TBT-Cl) inhibits ATP hydrolysis by the Na+-translocating ATP synthase of Ilyobacter tartaricus or the H+-translocating counterpart of Es
National Academy of Sciences.
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22. Ligand Specificity of a High Affinity Cytokinin-binding Protein 1
A soluble cytokinin-binding protein from wheat germ that has a high affinity for a range of purine cytokinins also interacts with a variety of nonpurine compounds that can affect cytokinin-modified processes in animal or plant cells or which bind to proteins known to interact with certain cytokinins. A variety of structurally disparate compounds which inhibi