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Determination of diflubenzuron residues in milk and cattle tissues Arq. Bras. Med. Vet. Zootec.
Tfouni,S.A.V.; Furlani,R.P.Z.; Carreiro,L.B.; Loredo,I.S.D.; Gomes,A.G.; Alves,L.A.; Mata,R.S.S.; Fonseca,A.M.D.; Rocha,R.M.S..
Diflubenzuron (DFB) is used to control ectoparasitic infestation by inhibiting larvae development in the manure and feces of treated animals. It is also currently been used to control tick infestations. In this study, milk and tissues from cattle treated orally with DFB for a 77-120 day period with a commercial product containing the compound were analyzed for the presence of residues. DFB residues were determined by using extraction with acetonitrile, cleanup with C18 SPE and chromatographic analysis by HPLC with UV detection (254nm). DFB was not detected in any of the analysed samples (<0.006mg kg-1 for fat, <0.014mg kg-1 for muscle, <0.015mg kg-1 for kidney, <0.016mg kg-1 for liver and <0.0006mg kg-1 for milk). In this manner, the use of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diflubenzuron; Larvicide; Veterinary drug; Cattle tissue; Milk.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000100043
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Gap junction modulation by extracellular signaling molecules: the thymus model BJMBR
Alves,L.A.; Nihei,O.K.; Fonseca,P.C.; Campos-de-Carvalho,A.C.; Savino,W..
Gap junctions are intercellular channels which connect adjacent cells and allow direct exchange of molecules of low molecular weight between them. Such a communication has been described as fundamental in many systems due to its importance in coordination, proliferation and differentiation. Recently, it has been shown that gap junctional intercellular communication (GJIC) can be modulated by several extracellular soluble factors such as classical hormones, neurotransmitters, interleukins, growth factors and some paracrine substances. Herein, we discuss some aspects of the general modulation of GJIC by extracellular messenger molecules and more particularly the regulation of such communication in the thymus gland. Additionally, we discuss recent data...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Thymus; Thymic epithelial cells; Connexin 43; Hormones; Interleukins.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000400012
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