Encontrados 12 documentos, a visualizar página 1 de 2
Photochemistry of 1-allyl-4-aryltetrazolones in solution; structural effects on...
Ismael, A.; Serpa, C.; Cristiano, Maria Lurdes SantosThe photochemistry of tetrazolones derived from the carbocyclic allylic alcohols cyclohex-2-enol and 3-methylcyclohex-2-enol and from the natural terpene alcohol nerol was investigated in solution with the aim of assessing the effect of solvent and of structural constraints imposed by bulky allylic moieties on photoproduct selectivity and stability. Photolysis of tetrazolones derived from nerol and cyclohex-2-e...
Sigmatropic rearrangements in 5-allyloxytetrazoles
Frija, L.; Reva, I. D.; Ismael, A.; Coelho, Daniela; Fausto, R.; Cristiano, Maria Lurdes SantosMechanisms of thermal isomerization of allyl tetrazolyl ethers derived from the carbocyclic allylic alcohols cyclohex-2-enol and 3-methylcyclohex-2-enol and from the natural terpene alcohol nerol were investigated. In the process of the syntheses of the three 1-aryl-5-allyloxytetrazoles, their rapid isomerization to the corresponding 1-aryl-4-allyltetrazol-5-ones occurred. The experiments showed that the imidat...
Tautomer Selective Photochemistry in 1-(Tetrazol-5-yl)ethanol
Ismael, A.; Cristiano, M. L. S.; Fausto, R.; Gómez-Zavaglia, A.A combined matrix isolation FTIR and theoretical DFT/B3LYP/6-311++G(d,p) study of the molecular structure and photochemistry of 1-(tetrazol-5-yl)ethanol [1-TE] was performed. The potential energy surface landscapes of the 1H and 2H tautomers of the compound were investigated and the theoretical results were used to help characterize the conformational mixture existing in equilibrium in the gas phase prior to de...
Photochemical Transformations of Tetrazole Derivatives: Applications in Organic...
Frija, L.; Ismael, A.; Cristiano, Maria Lurdes SantosTetrazoles remain a challenge to photochemists. Photolysis leads to cleavage of the tetrazolyl ring, may involve various photodegradation pathways and may produce a diversity of photoproducts, depending on the structure and conformational flexibility of the substituents and the possibility of tautomerism. If the photochemistry of tetrazoles is considered within the frame of synthetic applications the subject is...
Serological evidence of Rickettsia parkeri as the etiological agent of ricketts...
Conti-Díaz,Ismael A.; Moraes-Filho,Jonas; Pacheco,Richard C.; Labruna,Marcelo B.We report three new rickettsiosis human cases in Uruguay. The three clinical cases presented clinical manifestations similar to previous reported cases of Rickettsia parkeri in the United States; that is mild fever (< 40 ºC), malaise, headache, rash, inoculation eschar at the tick bite site, regional lymphadenopathy, and no lethality. Serological antibody-absorption tests with purified antigens of R. parkeri an...
Matrix-isolation FTIR, theoretical structural analysis and reactivity of amino-...
Almeida, R.; Gómez-Zavaglia, A.; Kaczor, A.; Ismael, A.; Cristiano, M.L.S.; Fausto, R.In this work, two novel amino-substituted derivatives of saccharin, N-(1,1-dioxo-1,2-benzisothiazol-3-yl)-N-methyl amine (MBAD) and N-(1,1-dioxo-1,2-benzisothiazol-3-yl)-N,N-dimethyl amine (DMBAD), were synthesized and characterized, and their molecular structure and vibrational properties were investigated by matrix-isolation FTIR spectroscopy and theoretical calculations undertaken using different levels of a...
On the unknown ecological niche of Paracoccidioides brasiliensis: our hypothesi...
Conti Días,Ismael A.In 1989, CONTI DÍAZ & RILLA published a hypothesis concerning the as yet unknown ecological niche of Paracoccidioides brasiliensis. The hypothesis proposed a highly efficient paracoccidioidal ecological strategy based on an important natural reservoir of the parasite, probably in heterothermic animals from fresh water environments. Further, the hypothesis proposed, a transient and variable residence in the ...
Dinâmica populacional da mosca-dos-chifres no Pantanal.
BARROS, A. T. M. de; ISMAEL, A. P. K.; GOMES, E. M.Durante dois anos, de junho/93 a maio/95, contagens de moscas-dos-chifres foram realizadas em dois rebanhos Nelore criados extensivamente na fazenda Nhumirim, sub-região da Nhecolândia, Pantanal, MS. Os rebanhos possuíam 40 e 60 vacas, mantidas sem tratamento inseticida durante o estudo. Contagens foram realizadas duas semanas consecutivas por mês, por observadores a cavalo, em pelo menos 50% dos animais em cad...
Comercialização e uso de produtos inseticidas para controle da mosca-dos-chifre...
RODRIGUES, S. R.; SANCHES, C. S.; FIALHO, E. M. L. M.; ISMAEL, A. P. K.; BARROS, A. T. M. de.A mosca-dos-chifres é considerada um sério problema econômico à pecuária devido aos prejuízos causados à produção e gastos com controle. Este estudo objetivou conhecer o perfil da comercialização e uso dos produtos inseticidas para controle da mosca-dos-chifres no município de Aquidauana, MS. De nov/1999 a nov/2000, informações foram obtidas em estabelecimentos agropecuários na cidade de Aquidauana e em entrevi...
Treatment of human scabies with oral ivermectin
CONTI DÍAZ,Ismael A.; AMARO,JorgeThirty-eight patients with scabies (21 males and 17 females) received oral ivermectin in two doses of 200 <FONT FACE="Symbol">m</FONT>g/kg at 7 days interval. Excellent results were achieved in 29 cases (76.34%), improvement in 6 (15.78%) and poor responses in 3 (7.88%). Tolerance was satisfactory-excellent in 32 patients (84.2%). The effectiveness and safety of the drug described in previous studies are confir...
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