Antifungal iridoids from the stems of Tocoyena formosa

A new antifungal iridoid compound, together with three active known iridoids, galioside, galioside aglucone, and apodanthoside, as well as 3-O-beta-D-glucopyranosyl-28-O-beta-D-glucopyranosyl quinovic acid and quercetin-3-O-methyl-3-O-beta-D-rhamnopyranoside, were isolated from the stems of Tocoyena formosa. This new compound was characterized by spectral data as 11-O-trans-feruloylteucrein.

The effect of pH on horseradish peroxidase-catalyzed oxidation of melatonin: Production of N1-acetyl-N2-formyl-5- methoxykynuramine versus radical-mediated degradation

There is a growing body of evidence that melatonin and its oxidation product, N1-acetyl-N2-formyl-5-methoxykynuramine (AFMK), have anti-inflammatory properties. From a nutritional point of view, the discovery of melatonin in plant tissues emphasizes the importance of its relationship with plant peroxidases. Here we found that the pH of the reaction mixture has a profound influence in the reaction rate and products distribution when melatonin is oxidized by the plant enzyme horseradish peroxidase. At pH 5.5, 1 mm of melatonin was almost completely oxidized within 2 min, whereas only about 3% was consumed at pH 7.4. However, the relative yield of AFMK was higher in physiological pH. Radical-mediated oxidation products, including 2-hydroxymelatonin, a dimer of 2-hydroxymelatonin and O-demethylated dimer of melatonin account for the fast consumption of melatonin at pH 5.5. The higher production of AFMK at pH 7.4 was explained by the involvement of compound III of peroxidases as evidenced by spectral studies. On the other hand, the fast oxidative degradation at pH 5.5 was explained by the classic peroxidase cycle. © 2007 The Authors.

Uterine and luteal hemodynamic evaluation of the non pregnant mare

Background: Studies with Doppler ultrassonography started at the end of the 90s for the determination of physiological and pathological alterations in the reproductive tract of the mare. Uterine alterations caused by inflammation, response from seminal plasma infusion, hormonal variations during estrous and diestrus, pregnancy and action of various vasoactive factors influence on the vascular perfusion detected by Doppler ultrasound. The development of efficient methods for uterine quality evaluation is of big importance for field equine reproduction veterinarians, once uterine environment is responsible for pregnancy maintenance. Review: Nowadays, the most used methods of uterine evaluation are the mode B ultrassonography, cytology, culture and biopsy. Hemodynamic evaluation of the uterus can be done by spectral data collected from large vessels, as A. uterine and its ramifications, or from subjective or objective evaluations from endometrium, miometrium and mesometrium attachment, which provide data referent to local and specific alterations of the evaluated area. Alterations in uterine vascular perfusion has been detected during estrous cycle, during pregnancy and in cases of infusion of inflammatory substances. These alterations happen because of vasoactive substances that act in the uterus during these events, however, most of these vasoactive substances are probably not even known. Also, important hemodynamic alterations in old mares, as an increase in vascular resistance, have been described. This increase might result from fibrosis of the uterus and in women it is considered to be a cause of infertility. In mares, periglandular fibrosis of the endometrium is considered to be the major diagnosable cause of embryonic and fetal loss in older mares. For the CL, ovarian artery of the mare supplies the ovary as well as the oviduct and therefore can be used for evaluation of these areas. The CL evaluation can also be done by the percentage of luteum area with colored signals as an indicator of the extent of blood flow. The percentage of the CL area with colored signals is determined subjectively by images observations in real time and/or by a freezing Power Doppler cross-section image with the maximum number of color pixels taped and the total number of color pixels is assessed by a computer analysis system. Therefore, a high correlation between plasmatic progesterone and CL vascularization also allows the CL evalution by this technique. In a first report, CL circulation reached its maximum on D5, the progesterone concentration in peripheral blood increased until D7 and in a posterior report, maximum perfusion was achieved two days after the maximum progesterone concentration (D8). Blood flow reduced between D10-D14 some days before the plasma progesterone decrease and, during the luteolytic period (D15-D17), the decline in CL blood-flow area was greater than blood flow decrease. Conclusion: Doppler ultrassonography add knowledge about uterine viability and CL functionality can be easily used by veterinarians in the field. It is a noninvasive method that provides real time results. However, because of the short time studies in this area have been done, many other answers still need to be found until normal and pathological patterns will be established.

Análise teórica de uma nova técnica de processamento de sinais interferométricos baseada na modulação triangular da fase óptica

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Produção e caracterização física e mecânica de compósito plástico-madeira

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Representações sociais da violência e da indisciplina escolar na imprensa brasileira

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Ultrassonografia Doppler em cães com hepatopatias difusas

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Coumarins and Alkaloids from the Stems of Metrodorea Flavida

Uma nova cumarina , a 5,6-metilenodioxi-7,8-dimetoxicumarina, foi isolada a partir dos galhos de Metrodorea flavida, juntamente com outras cumarinas e alcalóides conhecidos. As estruturas das substâncias isoladas foram definidas por análises de seus dados espectrais , bem como por comparação com dados da literatura.

Esteroides produzidos por Penicillium herquei, um fungo endofítico isolado dos frutos de Melia azedarach (Meliaceae)

ABSTRACT: Six compounds comprising the groups of steroids, the ergosterol, the ergosterol peroxide, the cerevisterol, the neociclocitrinols, the ergosta-4,6,8(14),22-tetraen-3-one, the 25-hydroxy-ergosta-4,6,8(14),22-tetraen-3-one, were isolated from Penicillium herquei fungus obtained from Melia azedarach. The structures were identified by spectral methods of RMN 1D and 2D and MS.

Policetídeos isolados de Penicillium herquei

Neste trabalho estamos portando o isolamento dos policetídeos citreoserina (1), emodina (2), janthinona (3), dihidrocitrinona (4) e citrinina H-1 (5). Os compostos foram isolados por procedimentos cromatográficos e identificados por métodos espectrais de RMN 1D e 2D e EM. Os compostos 1, 2 e 3 foram testados sobre promastigotas de Leishmania brasiliensis.

Active polyketides isolated from Penicillium herquei

Neste trabalho estamos relatando o isolamento por métodos clássicos de cromatografia de seis policetídeos de Penicillium herquei. Os compostos citreoseine ( 1) , emodina ( 2) , janthinona ( 3) , citrinina ( 4) , citrinina H1( 5) e dicitrinol ( 6) foram identificados por métodos espectrais de RMN 1D e 2D e EM. Os compostos 1, 2 e 3 foram testados contra formas promastigotas de Leishmania brasiliensis e 1 e 2 também foram ensaiados contra a Escherichia coli, Pseudomonas aeruginosa e Bacillus subtilis e mostraram boa atividade.

Chemical constituents of Aspergillus sp EJC08 isolated as endophyte from Bauhinia guianensis and their antimicrobial activity

Neste trabalho estamos reportando o isolamento de cinco compostos de Aspergillus sp EJC08 isolado como endofítico de Bauhinia guianensis uma planta típica da Amazônia. Os compostos ergosterol (1), peróxido de ergosterol (2), mevalolactona (3), monometilsulocrina (4) e tripacidina A (5) foram isolados através de procedimentos cromatográficos e identificados por métodos espectrais de RMN 1D e 2D e EM. Os compostos 3, 4 e 5 foram testados contra Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis e Staphylococcus aureus e mostraram boa atividade.

Maturação de sementes de sabiá (Mimosa caesalpiniifolia Benth.)

Pós-graduação em Agronomia - FCAV

Distribuição espacial de Phytophthora nicotianae da cultura da cebola em amostras de solo e reação de cultivares ao patógeno

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Padrões de diversidade e estrutura de taxocenoses de anfíbios anuros: análise em multi-escala espacial

Pós-graduação em Ciências Biológicas (Zoologia) - IBRC