Search results for "Bisphenol a"
showing 10 items of 62 documents
Environmental levels of bisphenol A, genistein and vinclozolin feminize digit length ratios in male rats: towards a new sensitive indicator of prenat…
2012
Environmental levels of bisphenol A, genistein and vinclozolin feminize digit length ratios in male rats: towards a new sensitive indicator of prenatal endocrine disruption and its impact in the progeny. – CIME project. Colloque PNR-PE
Bisphenol A, genistein and vinclozolin: three endocrine disruptors which differentially affect the mammary gland in rats : critical window of exposure
2012
Bisphenol A, genistein and vinclozolin: three endocrine disruptors which differentially affect the mammary gland in rats : critical window of exposure. Colloque PNR-PE
Inverse gas chromatography study of acid-base properties of cation resin used as catalysts of Bisphenol A synthesis
2001
The inverse gas chromatography method have been used for estimation of relative number of acid and base active centres for two type cation exchangers that are used as catalysts of Bisphenol A industrial synthesis. It was stated that after a few weeks of the continuous work of reactors filled with the catalysts, the acid-base properties of the latter have undergone significant changes. The number of acid centres decreased while the number of base centres increased. Simultaneously, the decreased of the yield of the synthesis product was observed.
Metody wydzielania, zatężania i oznaczania związków fenolowych z próbek środowiskowych i żywności
2011
Application of Molecular Imprinted Polymers for Selective Solid Phase Extraction of Bisphenol A
2016
Abstract Selective molecularly imprinted polymers (MIPs) with bisphenol A as template were synthesized using the non-covalent imprinting approach. MIPs were prepared using thermally initiated polymerization with 1,1’-azobis(cyclohexanecarbonitryle) (ACHN) as initiator and ethylene glycol dimethacrylate (EDMA) as a cross-linking agent. The tested functional monomers included methacrylic acid, acrylamide, and 4-vinylpyridine. The selectivity of the BPA-MIP for the solid phase extraction of bisphenol A was tested in samples containing other related alkylphenols. The polymers prepared in acetonitrile using methacrylic acid or acrylamide as monomer showed the highest selectivity towards target a…
A Study of Polycarbonate-Liquid Crystal Polymer Blends
1992
BThe morphologican and mechanical properties of blends of bisphenol-A polycarbonate (PC) with a wholly aromatic liquid crystal copolyesteramide (Vectra-B) are discussed with reference to the conditions used for their preparation. The blends made by extrusion behave as mixtures of incompatible polymers. THe behaviour of the blends prepared in a batch mixer depends strongly on mixing time. A slight decrease in the mechanical properties accompanies the morphological changes associated with a progressive improvement in the compatibility of the two polymers
Bisfenola A saturošo zobārstniecības kompozītu genotoksicitāte
2019
Daži zobārstniecībā izmantojamie sveķu kompozīti satur monomērus ar BPA kā bāzes elementu, kas izraisa dzīvo šūnu genotoksicitāti un spēj izraisīt dzīvo šūnu nāvi. Šie monomēri spēj noārdīties cilvēka siekalās esošo esterāžu iedarbībā, tādējādi izdalot toksiskos noārdīšanās produktus mutes dobumā. Izdalītie monomēri pat var iekļūt asinsritē, izejot cauri zoba struktūrām uz pulpu. Šī pētījuma mērķis bija izpētīt zobārstniecības kompozīta materiālu ietekmi uz cilvēka asins šūnām, tieši uz limfocītiem, un novērtēt šūnu DNS bojājumu līmeni. Lai izpētītu šo jautājumu, 4 dažādi komerciāli pieejamie zobārstniecības kompozīta materiālu fragmenti tika izmērcēti izolētās cilvēka perifēro asiņu mononu…
Photoactive Yellow Protein Chromophore Photoisomerizes around a Single Bond if the Double Bond Is Locked
2020
Photoactivation in the Photoactive Yellow Protein, a bacterial blue light photoreceptor, proceeds via photo-isomerization of the double C=C bond in the covalently attached chromophore. Quantum chemistry calculations, however, have suggested that in addition to double bond photo-isomerization, the isolated chromophore and many of its analogues, can isomerize around a single C-C bond as well. Whereas double bond photo-isomerization has been observed with x-ray crystallography, experimental evidence for single bond photo-isomerization is currently lacking. Therefore, we have synthesized a chromophore analogue, in which the formal double bond is covalently locked in a cyclopentenone ring and ca…
Effect of bisphenol A on ameloblasts and tooth enamel mineralization
2011
Effect of bisphenol A on ameloblasts and tooth enamel mineralization. Journées de l’école doctorale
Modification des préférences gustatives et de la plasticité structurale des glandes salivaires par une exposition chronique au bisphenol A chez le ra…
2011
Modification des préférences gustatives et de la plasticité structurale des glandes salivaires par une exposition chronique au bisphenol A chez le rat male adulte. colloque de la SFORL