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Numerosos casos de poluição no meio ambiente por metais tóxicos têm sido noticiado, despertando grande preocupação. Nessa perspectiva, os ácidos húmicos (AH) e fúlvicos (AF) surgem como importantes atores por suas propriedades e capacidade de promover interação, estabilidade com metais tóxicos e consequente redução dos efeitos nocivos para comparti...
As ações terapêuticas e farmacológicas de plantas decorrente da ação de metabólitos secundários e uma importante para a valorização e conhecimento da biodiversidade rica do Brasil. Nesse contexto, este estudo objetivou a investigação por métodos in vitro da ação antioxidante e fotoprotetora de extratos otimizados por planejamentos de mistura de sol...
Esta pesquisa teve como objetivo avaliar o processo de participação dos estudantes de Licenciatura em Química do Instituto Federal de Educação, Ciência e Tecnologia da Bahia (IFBA) – Campus Porto Seguro, BA, em uma Trilha Interpretativa na Aldeia Pataxó da Reserva da Jaqueira em Porto Seguro, BA concebida segundo pressupostos da Educação Ambiental...
Given the current threatening scenario faced by coral reefs, reproductive biotechnologies can be a helping hand in the fight against extinction. Therefore, safe methods to assess viability of coral gametes are essential. In this study, we aimed to develop a reliable method to assess oocyte viability for scleractinian corals using Mussismilia hartti...
In this work, a method was developed for the determination of Na, K, Ca, Mg, P, S, Fe, Zn, Mn and Cu by ICP OES and caffeine and epicatechin by HPLC-DAD in industrialized guarana-based beverages. The acid digestion in microwave oven was optimized by constrained mixture design. The optimum volumes found for the reagents were 2.60 mL (HNO3), 1.80 mL...
Trace elements in high concentrations are a huge problem worldwide. Monitoring of natural areas with a high concentration of these elements, such as soils under the influence of gossans, is important since there is little information available. This study aimed to evaluate the pseudo total and available concentrations of Fe, Mn, Pb, and Zn in the s...
A baixa disponibilidade no mercado de sondas multiparâmetros de baixo custo que permitam a coleta de dados e acesso aos seus resultados em tempo real remotamente levou ao desenvolvimento dessa pesquisa. Este trabalho apresentou uma contribuição na criação e implementação de um sistema integrado (hardware e software), batizado de Polypus, que se bas...
Antocianinas são pigmentos naturais responsáveis por uma variedade de cores observadas em frutos, flores e algumas folhas, caules e raízes de plantas. A quantidade de antocianinas extraída foi medida pelo método diferencial pH, comumente usado em amostras ou em produtos alimentícios. No entanto, essa metodologia clássica demanda grande quantidade d...
The stochastic differential equation (SDE) corresponding to nonlinear Fokker-Planck equation where the nonlinearity appearing in this evolution equation can be interpreted as providing an effective description of a system of particles interacting is obtained. Additionally, we propose a stochastic model for time dynamics of the COVID-19 based in the...
This book is a scientific dissemination work, focusing on children. Here we tell the story of the Biological Museum of the Butantan Institute, a centenary research institution in Brazil, famous for its studies with venomous snakes and the manufacture of serums and vaccines. We list natural history informations about some snakes species that can be...
Fruit-like seeds of Stevia rebaudiana (Bert) Bertoni were immersed into organic solutions for 24 hrs and the germination responses were evaluated by counting the percentage of normal and abnormal seedlings and non-germinated seeds. Data were analyzed by a mixed non-linear model, and treatments and electrical conductivity did not have effects on the...
The seed imbibition control using organic solution (priming) is an alternative to achieve even germination events and rapid establishment of normal seedlings. We immersed fruit-like seeds of Stevia rebaudiana (Bert) Bertoni into hydro- and organic solution with the control of the electric conductivity evaluated as random effect in a regression mixe...
This work intends to describe the history of regional meeting of the Brazilian Chemical Society in the northeast region of Brazil, one of the first of this type of meetings in Brazil. The article provides a historical account of the initial meetings held between 1983 and 1989, as well as a detailed description of the current events, restarted in 20...
Cratylia mollis Mart ex. Benth is a species belonging to the Leguminosae family that exists throughout South America, and it is one of the most abundant plants in northeastern Brazil, especially in the semiarid region. This plant is popularly known as "camaratu" and "camaratuba", and the leaves and stems of this species are used as a substitute for...
Phytochemical investigation of the MeOH extract of Schinopsis brasiliensis Engl. stems led to the isolation of the new biflavanone (2R∗,3R∗,2″R∗,3″R∗)-7-hydroxy-4′-methoxy-flavanone-(3→3″)-3⌄,7″-dihydroxy-4⌄-methoxy-flavanone and 4,2′,4′-trihydroxychalcone-(3→O→4″)-2⌄,4⌄-dihydroxychalcone, whereas methyl gallate, gallic acid, (6R,9R)-megastigma-4-e...
Counter-current chromatography (CCC) was applied to the preparative separation of the methylxantines (theophylline, theobromine, and caffeine) from the methanol extract of Theobroma cacao seeds. The solvent system used was composed of hexane-ethyl acetate-methanol-water (2:3:1:1 v/v/v/v) and the extraction was monitored by high-performance liquid c...
Abstract: Therapeutic ultrasound (TUS) is a resource widely used in areas of physical therapy, and one of the recommended methods of application of this feature is to use a water bag for coupling when the anatomical regions are very irregular. However, the study is scarce this technique in scientific articles, so if you can not guarantee that this...
Solid-state compounds of yttrium and lanthanide chelates of ethylenediaminetetraacetic acid have been synthesized. Simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), theoretical and experimental infrared spectroscopy (FTIR), elemental analysis, complexometry and TG-DSC coupled to FTIR were used to characterize and to stud...
O artigo apresenta uma discussão sobre atividades matemáticas realizadas com um grupo de 22 pessoas, idosos e adultos maduros, participantes de um projeto de extensão universitária em uma cidade do interior do Estado de São Paulo. O intuito é entender como proposta como Conversas sobre matemática pode ser uma possibilidade para pessoas na terceira...
Recent studies indicate that incorporation of nanofillers accelerates polymer crystallization by acting as nucleating agent. Among the useful nanofillers are montmorillonite clay (MMT), carbon nanotubes, mica and precipitated calcium carbonate (PCC). In this work composites of polypropylene (PP) were prepared with 5 wt% montmorillonite (MMT-Na+); M...
Synthesis, characterization and thermal decomposition of bivalent transition metal α-hydroxyisobutyrates, M(C4H7O3)2·nH2O (M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II)), as well as the thermal behaviour of α-hydroxyisobutyric acid and its sodium salt were investigated employing simultaneous thermogravimetry and differential scanning calorimet...
A new tropane alkaloid, named the 7β-acetoxy-3β,6β-dibenzoyloxytropane (1), was isolated from a methanol extract of Erythroxylum rimosum O.E. Schulz leaves. Other known compounds were detected, including quercetin, kaempferol-3-O-α-l-arabinofuranoside, (+)-catechin, epicatechin, quercetin-3-O-α-arabinofuranoside, quercetin-3-O-α-arabinopyranoside,...
Context:
Cratylia mollis Martius ex Benth. and Cenostigma macrophyllum Tul. (Leguminosae) are both endemic Brazilian plants and they are used by the natives as medicinal plants, and the leaves of C. mollis are also employed as forage for cattle during the dry season of region.
Objective:
Isolation of the compounds responsible for the acetylcholi...
Solid-state Ln–L compounds, where Ln stands for heavy trivalent lanthanides or yttrium(III) (Tb–Lu, Y) and L is succinate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-DTA coupled to FTIR, elemental analysis, X-ray powder diffracto...
Solid-state LnL3·1.25H2O compounds, where L is oxamate and Ln is light trivalent lanthanides, have been synthesized. Simultaneous thermogravimetry and differential scanning calorimetry (TG–DSC), experimental and theoretical infrared spectroscopy, TG–DSC coupled to FTIR, elemental analysis, complexometry, and X-ray powder diffractometry were used to...
Solid state M-L, where M stands for bivalent transition metals (Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)) and L is mandelate, were synthesized. Simultaneous thermogravimetry and differential scanning calorimetry, elemental analysis and complexometry were used to establish the stoichiometry and to study the thermal behaviour of these compou...
Betulinic, ursolic and oleanolic acids isolated from the aerial parts of Eriope blanchetii (Lamiaceae) were subjected to different esterification reactions, yielding 12 C-3 position ester derivatives. All compounds were identified using spectroscopic techniques, such as IR, 1 H-NMR and MS. The derivatives were further investigated for their antioxi...
This work describes the isolation of an active flavonoid fraction and identification of isorhamnetin 3-O-β-D-(6''-acetyl)-galactopyranoside from flowers of B. perennis, and also the evaluation of anticholinesterase (AChE) activity of ethanolic extract from flowers (EEF) and the active fraction. The chemical structure of the flavonoid was defined on...
This paper describes the chemical composition and acetylcholinesterase inhibition of an active chromatographic fraction of the EtOAc extract of Citrus limon leaves. The composition of the active fraction presented a mixture of two coumarins, 5,8-dimethoxy-psoralen and 5,7- dimethoxycoumarin, identified by ¹H and ¹³C NMR data analysis, including DEP...
Ultrasound Therapy is commonly used in Physiotherapy in order to generate physiological effects; however, there is not enough care to the effectiveness and safety given by this type of technology in clinical practice. The requirements of safety for physiotherapy ultrasound equipments are provided by the standard IEC 61689 (2007). The present work e...
Ultrasound Therapy is commonly used in Physiotherapy in order to generate physiological effects; however, there is not enough care to the effectiveness and safety given by this type of technology in clinical practice. The requirements of safety for physiotherapy ultrasound equipments are provided by the standard IEC 61689 (2007). The present work e...
Ultrasound Therapy is commonly used in Physiotherapy in order to generate physiological effects; however, there is not enough care to the effectiveness and safety given by this type of technology in clinical practice. The requirements of safety for physiotherapy ultrasound equipments are provided by the standard IEC 61689 (2007). The present work e...
Ultrasound Therapy is commonly used in Physiotherapy in order to generate physiological effects; however, there is not enough care to the effectiveness and safety given by this type of technology in clinical practice. The requirements of safety for physiotherapy ultrasound equipments are provided by the standard IEC 61689 (2007). The present work e...
Characterization, thermal stability and thermal decomposition of light trivalent lanthanide fumarates, as well as, the thermal
behaviour of fumaric acid and its sodium salt were investigated employing simultaneous thermogravimetry and differential thermal
analysis, differential scanning calorimetry, Fourier transform infrared spectroscopy (FTIR), T...
Characterization, thermal stability and thermal decomposition of light trivalent lanthanide mandelates Ln(C6H5CH(OH)CO2)(3)center dot nH(2)O (Ln = La to Gd, except Pm) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), experimental and theoretical infrared s...
Characterization, thermal stability and thermal decomposition of transition metal mandelates, M(C6H5CH(OH)CO2)2 (M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), as well as the thermal behaviour of mandelic acid C6H5CH(OH)CO2H and its sodium salt were investigated employing simultaneous thermogravimetry and differential scanning calorimetry (TG–...
Solid-state M-2-MeO-CP compounds, where M represents bivalent Mn, Fe, Co, Ni, Cu, Zn and 2-MeO-CP is 2-methoxycinnamylidenepyruvate, were synthesized for the first time. Simultaneous thermogravimetry and differential thermal analysis, differential scanning calorimetry, X-ray powder diffractometry, infrared spectroscopy, TG-FTIR system, elemental an...
Esse trabalho tem o objetivo de explorar alguns aspectos do livro Motins políticos ou história dos principais acontecimentos políticos na província do Pará desde 1821 até 1835, publicado pelo historiador Domingos Antônio Raiol (Barão de Guajará). Ele irá examinar os usos e significados do conceito “motim”, que além de bastante utilizado pela histor...
This work describes the phytochemical study of stems of Mimosa invisa (Mimosaceae) and the evaluation of the antioxidant potential of isolated compounds. Cromatografic techniques were employed to isolate salicifoliol, pinoresinol, quercetin, quercetin-3-O-rhamnopyranosyl, quercetin-3-O-arabinofuranosyl lupeol, β-amyrin, sitosterol, p-hydroxy coumar...
Tapirira guianensis (Stick pigeon), a widely-used herbal medicine, has been reported to possess various biological activities. The aim of this study was the phytochemical analysis of the fractions of extracts of T. guianensis and the investigation of the action of these extracts on the activity of gelatinases using zymography. Matrix metalloprotein...
Tapirira guianensis (Stick pigeon), a widely-used herbal medicine, has been reported to possess various biological activities. The aim of this study was the phytochemical analysis of the fractions of extracts of T. guianensis and the investigation of the action of these extracts on the activity of gelatinases using zymography. Matrix metalloprotein...
Synthesis, characterization, and thermal behavior of transition metal oxamates, M(NH2C2O3)2·nH2O (M=Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II)), as well as the thermal behavior of oxamic acid and its sodium salt
(NaNH2C2O3) were investigated employing simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC), experimental and...
Characterization, thermal stability and thermal decomposition of light trivalent lanthanide succinates, Ln2(C4H4O4)3·nH2O (Ln=La to Gd, except Pm) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy, TG-FTIR system, elemental analysis an...
Phytochemical investigation of the aerial parts of Eriope blanchetii and E. latifolia (Lamiaceae) yielded podophyllotoxin, as well as the aryltetralin lignans α- and β-peltatin and yatein. Oleanolic, ursolic and epikatonic acids were also isolated. This is the first occurrence of podophyllotoxin in the family.
Characterization, thermal stability and thermal decomposition of transition metal malonates, MCH2C2O4·nH2O (M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II)), as well as, the thermal behaviour of malonic acid (C3H4O4) and its sodium salt (Na2CH2C2O4·H2O) were investigated employing simultaneous thermogravimetry and differential thermal analysis (...
Thermal stability and thermal decomposition of succinic acid, sodium succinate and its compounds with Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA) in nitrogen and carbon dioxide atmospheres and TG-FTIR in nitrogen atmosphere. On heating, in bot...
In order to increase the efficiency of cacao tree resistance to witches' broom disease, which is caused by Moniliophthora perniciosa (Tricholomataceae), we looked for molecular markers that could help in the selection of resistant cacao genotypes. Among the different markers useful for developing marker-assisted selection, single nucleotide polymor...
C. From the methanolic extract of the leaves of Cratylia mollis were obtained by chromatographic techniques (3S,5S,6S,9R)-3,6-dihydroxy-5,6-dihydro-b-ionol (1), and a new bis-norisoprenoid named (4S*, 6S*)-4-but-1E-enyl-4,6-dihydroxy-3,5,5-trimethyl-cyclohex-2-enone (2) as well as 5a,8a-epidioxyergosta-6,22-dien-3-b-ol. The structures of the pure c...
Theobroma cacao L.–Moniliophthora perniciosa expressed sequence tags (ESTs) were converted into useful satellite markers for population analysis and genetic mapping.
Forty-nine flanking primer pairs from TSH1188 (a resistant genotype) and Catongo (a susceptible genotype) ESTs were designed
and screened for polymorphism analysis. Eleven were polymor...
Estudio transversal desarrollado con un abordaje cuantitativo con el objeto de evaluar la aparición de infecciones urinarias, principales agentes etiológicos y grupos de antibióticos en un universo de treinta y ocho pacientes con sonda vesical de demora y con edades entre los quince y los noventa y un años, internados en una unidad de vigilancia in...
Microsatellite markers of Crinipellis perniciosa, with three and four repeats, were developed from sequence database and evaluated for their usefulness in detecting genetic polymorphism. Thirty-three primers produced unambiguous amplification products of 28 microsatellite-containing loci and 14 microsatellite-like polymorphic loci, with two to seve...
Novel derivatives of lapachol 2, nor-lapachol 3 and lawsone 4 have been synthesized by nucleophilic displacement of the methoxynaphthoquinones 2a, 3a and 4a with the polyamine (PA) N¹-Boc-N5-Bn-spermidine 1a. The respective products 2b-4b were obtained in good yields and characterized by spectroscopic and analytical methods. The inhibitory action o...
The differentiation of terminal amino groups in polyamines usually involves a series of protection and deprotection steps, leading to long reaction sequences with low overall yields. Given the relevance of the biological activities displayed by polyamines, the development of more efficent synthetic routes for these compounds is highly desired. Here...
In the present work the lixiviation process of the amalgam and the solvent extraction of the mercury were studied. The amalgam samples were collected from Dental Clinics and it were ground with a ball mill. This material was dissolved using three different acid solutions: HCl, HNO3 and royal water and the following parameters temperature, concentra...
Introdução Diversas hipóteses têm sido levantadas para explicar a origem e a evolução das galhas, entre elas o estresse hídrico e proteção contra inimigos naturais (Price et al., 1986,1987). A primeira argumenta que ambientes xéricos apresentam maior freqüência de galhas do que ambientes mésicos, pois tais insetos estariam mais protegidos de dessec...
RESUMO: Este trabalho descreve a avaliação da atividade antioxidante de alguns flavonóides isolados de plantas da região do semi-árido. Os flavonóides selecionados foram submetidos aos testes de inibição da oxidação do β-caroteno promovido pelo ácido oleanólico e o de seqüestro do radical DPPH. Esses testes foram acompanhados por espectrofotometria...
Estudo transversal desenvolvido numa abordagem quantitativa, com o objetivo de avaliar a ocorrência de infecção urinária, principais agentes etiológicos e grupos de antibióticos junto a uma população-amostral de 38 pacientes com sonda vesical de demora na faixa etária dos 15 aos 91 anos internados em uma unidade de terapia intensiva de uma institui...