Cyclic Ether
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Efeito de diferentes tempos de exposição ao calor e de linhagens sobre o rendimento de carcaça e a composição química de peito de frangos de corte
RESUMO Investigaram-se os efeitos de diferentes tempos de exposição ao calor sobre o rendimento de carcaça, cortes e vísceras comestíveis e a composição química da carne de peito de frangos de corte de duas linhagens. Foram alojados 560 pintos de corte da linhagem Cobb 500 Slow® e 560 da Hubbard Flex® em 32 boxes. A partir do 14º dia, eles foram d
Arq. Bras. Med. Vet. Zootec.. Publicado em: 2019-02
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2. Antinociceptive effect of semi-purified petroleum ether partition of Muntingia calabura leaves
ABSTRACT Muntingia calabura L., Muntingiaceae, is a medicinal plant for various pain-related diseases. The aims of the present study were to determine the antinociceptive profile and to elucidate the possible mechanisms of antinociception of petroleum ether partition obtained from crude methanol extract of M. calabura leaves using various animal models. The
Rev. bras. farmacogn.. Publicado em: 2016-08
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3. Reações de oxidação de derivados de cis-octalinas promovidas por trinitrato de tálio (TTN)
The reaction of ten cis-octalins and cis-octalones with thallium trinitrate (TTN) leads to different products, depending mainly on the substitution pattern of the substrate. Functionalized cis-hydrindanes were obtained from the reaction of 1,2,3,4,4a,5,8,8a-octahydro-4a-methylnaphthalene and of 1,2,3,4,4a,5,8,8a-octahydro-4a,7-dimethylnaphthalene with TTN in
Química Nova. Publicado em: 2008
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4. Ciclofuncionalização de β,-enamino Ésteres e β-hidróxi ésteres / Electrophilic cyclization of alkenyl-substituted β-enamine esters and β-hydroxy esters
Nosso grupo de pesquisa vem se dedicado, há vários anos, ao estudo das reações de ciclização eletrofílica de substratos insaturados que contêm um nucleófilo interno (oxigênio ou nitrogênio). Este trabalho teve como objetivo obter derivados de éteres cíclicos de cinco e seis membros diferentemente funcionalizados. Compostos 1,3-dicarbonílicos e
Publicado em: 2002
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5. Studies aiming the total synthesis of Siphonodiol / Reagentes de telúrio em síntese orgânica estudos visando a síntese total do siphonodiol
The main objective of this project consists in the total synthesis of Siphonodiol using reactions already systematically studied in our group. Siphonodiol is a natural product of the group of polyacetylenes which exhibits a potent antifungal activity. The enantioselective synthesis of the diol fragment was effected in three steps from ascorbic acid by means
Publicado em: 2000
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6. Reação de difenilciclopropenona com 2-aminopiridinas e compostos relacionados
Diphenylcyclopropenone reacts with 2-aminopyridines in diethyl ether to give cis-3,4-dihidro-3,4-diphenyl-2H-pyrido [1,2-a] pyrimidin-2-ones and N(2-pyridil) cis-2,3-diphenylacrylamides. The same reaction in methanol leads to trans-pyridopyrimidin-2-ones and crylamides. In methanol the cis-pyridopyrimidin-2-ones isomerize to trans-pyridopyrimidin-2-ones and
Publicado em: 1975
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7. Antischistosomal Activity of Hexadecyloxypropyl Cyclic 9-(S)-[3-Hydroxy-2-(Phosphonomethoxy)Propyl]Adenine and Other Alkoxyalkyl Esters of Acyclic Nucleoside Phosphonates Assessed by Schistosome Worm Killing In Vitro▿
9-(S)-[3-Hydroxy-2-(phosphonomethoxy)propyl]adenine [(S)-HPMPA] has been reported to have antischistosomal activity. Ether lipid esters of (S)-HPMPA and cidofovir (CDV) have greatly increased activities in antiviral assays and in lethal animal models of poxvirus diseases. To see if ether lipid esters of CDV and (S)-HPMPA enhance antischistosomal activity, we
American Society for Microbiology (ASM).
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8. Increased levels of adenosine 3',5'-cyclic monophosphate in Tetrahymena stimulated by glucose and mediated by Ca2+ and epinephrine.
Stationary phase Tetrahymena cells exposed to 0.5-1% glucose experience an 8-fold increase in intracellular cyclic AMP within 1 hr. The increase follows an enhanced uptake of Ca2+ triggered by the glucose addition. Inhibiting the Ca2+ influx with ethylene glycol bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid blocks the increase in cyclic AMP, but the
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9. Inhibition of Photosynthetic Electron Transport by Diphenyl Ether Herbicides 12
The effects of the diphenyl ether herbicides HOE 29152 (methyl-2[4-(4-trifluoromethoxy) phenoxy] propanoate) and nitrofluorfen (2-chloro-1-[4-nitrophenoxy]-4-[trifluoromethyl]benzene) on photosynthetic electron transport have been examined with pea seedling and spinach chloroplasts. Linear electron transport (water to ferricyanide or methylviologen) is inhib
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10. Mode of Action Studies on Nitrodiphenyl Ether Herbicides: I. Use of Barley Mutants to Probe the Role of Photosynthetic Electron Transport
5-[2-Chloro-4-(trifluoromethyl)phenoxy]-2-nitroacetophenone oxime-o-(acetic acid, methyl ester) (DPEI), is a potent nitrodiphenyl ether herbicide which causes rapid leaf wilting, membrane lipid peroxidation, and chlorophyll destruction in a process which is both light- and O2-dependent. These effects resemble those of other nitrodiphenyl ether herbicides. Un
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11. Dibiphytanyl Ether Lipids in Nonthermophilic Crenarchaeotes
The kingdom Crenarchaeota is now known to include archaea which inhabit a wide variety of low-temperature environments. We report here lipid analyses of nonthermophilic crenarchaeotes, which revealed the presence of cyclic and acyclic dibiphytanylglycerol tetraether lipids. Nonthermophilic crenarchaeotes appear to be a major biological source of tetraether l
American Society for Microbiology.
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12. Cairomycin B, a New Antibiotic
Cairomycin B is a new cyclic peptide antibiotic that was isolated from Streptomyces As-C-19 obtained from the soil of Cairo. The antibiotic had the following empirical formula: C10H15N3O3; on acid hydrolysis, it yielded aspartic acid and lysine. Spectral analysis and its chemical characteristics indicated that it was a cyclic peptide. The antibiotic melted a