bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluación del rendimiento de pepino bajo dos sistemas de fertilización en invernadero
Authors: Tambo Caraguay Víctor Raúl , Romero Sandoval Boris Lenin , Merino Jaramillo Luis Gerardo , Arevalo Bautista Shirley Elizabeth
Published: July 2023

El uso de fertilizantes tiene un impacto significativo en el rendimiento de los cultivos. La economía busca en el suelo que los productos sean de tamaño y cantidad. Para conseguir este objetivo el hombre optó por el uso indiscriminado de agroquímicos, con resultados económicos importantes para los productores, pero nefastos para los suelos, plantas y consumidores. La presente investigación tiene como propósito evaluar el rendimiento de pepino bajo dos sistemas de fertilización (Biol y Yaramila) en invernadero. La investigación se realizó bajo una metodología tipo diseño experimental, de la manera más simple y sencilla, que consiste en la recogida de datos y un análisis estadístico. Se plantaron 9 camas de pepino, de la variedad Híbrido Diamante, y se trató con Biol las camas 1, 3, 5, 7 y 9. Asimismo, se trató con Yaramila las camas 2, 4, 6 y 8. En los resultados se encontraron que de las camas tratadas con Yaramila se obtuvo una cosecha total de 78 frutos, mientras que de las tratadas con Biol se obtuvo una cosecha de 65 frutos. En cuanto a las características largo, ancho y peso, en la cosecha tratada con Yaramila se calculó un largo promedio de 25.19 cm, un ancho promedio de 5.97 y un peso promedio de 424.72 gr., mientras que los tratados con Biol, tuvieron un largo promedio de 24.75 cm de largo, un ancho promedio de 5.99 y un peso promedio de 420, 95 gr. De lo anterior se concluye que, los porcentajes de diferencia son mínimos entre los cultivos tratados con Biol y Yaramila. En consecuencia, los cultivos tratados con el fertilizante químico Yaramila obtuvieron casi el mismo rendimiento de pepino que los tratados con Biol. Se recomienda realizar estas pruebas en una extensión mayor de siembra, asimismo, en distintos materiales genéticos de pepino y diferentes condiciones de siembra.
As equipes profissionais elaboradoras dos Estudos e Relatórios de Impacto Ambiental (EIAs/RIMAs): uma contribuição para o aprimoramento do licenciamento ambiental no Brasil (The professional teams elaborating the Studies and Reports of Environmental Impact (EIAs / RIMAs): a contribution to the improvement of environmental licensing in Brazil)
Authors: Gutierres Henrique Elias Pessoa , Santos Camilla Jerssica da Silva , Rodrigues Jessika de Oliveira Neles , Pereira Valdeniza Delmondes
Published: July 2023

A viabilidade ambiental de empreendimentos com significativo poder de degradação ambiental é submetida as diretrizes do licenciamento ambiental por meio do Estudo e do respectivo Relatório de Impacto Ambiental (EIA/RIMA). Este artigo busca discutir a composição das equipes profissionais elaboradoras dos EIAs/RIMAs protocolados no órgão ambiental do estado da Paraíba, entre os anos de 2000 e 2015, baseado numa pesquisa aplicada e descritiva sob o método documental. Várias deficiências na composição das equipes e no exercício profissional foram constatadas. Portanto, almeja-se um maior aprimoramento do licenciamento ambiental por parte do poder público, na busca por estudos ambientais bem elaborados, que contribuam para o aprimoramento do licenciamento ambiental e sejam efetivamente aplicados na gestão ambiental dos empreendimentos. Palavras-chave: Licenciamento ambiental, Estudo de Impacto Ambiental, Equipe multidisciplinar.    A B S T R A C TThe environmental feasibility of projects with significant environmental degradation power is subject to environmental licensing guidelines through the Study and Environmental Impact Report (EIA / RIMA). This article aims to discuss the composition of the professional teams elaborating the EIAs / RIMAs filed in the environmental agency of the state of Paraíba, between 2000 and 2015, based on an applied and descriptive research under the documentary method. Several deficiencies in the composition of the teams and in the professional exercise were verified. Therefore, a greater improvement of the environmental licensing by the public power is sought, in the search for well-designed environmental studies, that contribute to the improvement of the environmental licensing and are effectively applied in the environmental management of the enterprises.Keywords: Environmental licensing, Environmental Impact Study, Multidisciplinary team.
Analysis of the structure and vibrational spectra of glucose and fructose
Authors: Ibrahim Medhat Ahmed , Allam Mousa , El-Haes Hanan , Jalbout Abraham F. , De Leon Aned
Published: July 2023

Molecular modelling using semiempirical methods AM1, PM3, PM5 and, MINDO as wellas the Density Functional Theory method BLYP/DZVP respectively were used to calculate the struc-ture and vibrational spectra of d-glucose and d-fructose in their open chain, α-anomer and β-anomermonohydrate forms. The calculated data show that both molecules are not linear; ground state and thenumber for the point-group C is equal to 1. Generally, the results indicate that there are similarities inbond lengths and vibrational modes of both molecules. It is concluded that DFT could be used to studyboth the structural and vibrational spectra of glucose and fructose.
Sensitive bromatometric assay methods for finasteride in pharmaceuticals
Authors: Kanakapura Basavaiah , Somashekar Bankavadi Chikkaswamy , Anilkumar Urdigere Rangachar , Ramakrishna Veeraiah
Published: July 2023

Three sensitive spectrophotometric methods are presented for the determination of finas-teride in bulk and in tablets. The methods rely on the use of bromate-bromide reagent and three dyesnamely, methyl orange, indigocarmine and thymol blue as reagents. They involve the addition of ameasured excess of bromate-bromide reagent to finasteride in acid medium, and after the brominationreaction is judged to be complete, the unreacted bromine is determined by reacting with a fixed amountof either methylorange and measuring the absorbance at 520 nm (method A) or indigocarmine andmeasuring the absorbance at 610 nm (method B) or thymol blue and measuring the absorbance at 550nm (method C). In all the methods, the amount of insitu generated bromine reacted corresponds to theamount of finasteride. The absorbance measured at the respective wavelength is found increase linear-ly with the concentration of finasteride. Beer’s law is obeyed in the ranges 0.25- 2.0, 0.5-6.0 and 1-12μg mL -1 for method A, method B and method C, respectively.
Sensitive spectrophotometric determination of lansoprazole in pharmaceuticals using ceric ammonium sulphate based on redox and complex formation reactions
Authors: Kanakapura Basavaiah , Ramakrishna Veeraiah , Anilkumar Urdigere Rangachar
Published: July 2023

Two simple sensitive and cost-effective spectrophotometric methods are described forthe determination of lansoprazole (LPZ) in bulk drug and in capsules using ceric ammoniumsulphate (CAS), iron (II), orthophenanthroline and thiocyanate as reagents. In both methods, anacidic solution of lansoprazole is treated with a measured excess of CAS followed by thedetermination of unreacted oxidant by two procedures involving different reaction schemes. Thefirst method involves the reduction of residual oxidant by a known amount of iron(II), and theunreacted iron(II) is complexed with orthophenanthroline at a raised pH, and the absorbance of theresulting complex measured at 510 nm (method A). In the second method, the unreacted CAS isreduced by excess of iron (II), and the resulting iron (III) is complexed with thiocyanate in the acidmedium and the absorbance of the complex measured at 470 nm (method B). In both methods, theamount CAS reacted corresponds to the amount of LPZ. In method A, the absorbance is found toincrease linearly with the concentration of LPZ where as in method B a linear decrease inabsorbance occurs.
Immersion enthalpy variation of surface-modified mineral activated carbon in lead (II) aqueous solution adsorption: the relation between immersion enthalpy and adsorption capacity
Authors: Gutierrez Liliana Giraldo , Moreno-Piraján Juan Carlos
Published: July 2023

An activated carbon was obtained by chemical activation with phosphoric acid, CM, froma mineral carbon. Afterwards, the carbon was modified with 2 and 5 molL -1 , CMox2 and CMox5 nitricacid solutions to increase the surface acid group contents. Immersion enthalpy at pH 4 values and Pb 2+adsorption isotherms were determined by immersing activated carbons in aqueous solution. Thesurface area values of the adsorbents and total pore volume were approximately 560 m 2 .g -1 and 0.36cm 3 g -1 , respectively. As regards chemical characteristics, activated carbons had higher acid sitescontent, 0.92-2.42 meq g -1 , than basic sites, 0.63-0.12 meq g -1 . pH values were between 7.4 and 4.5 atthe point of zero charge, pH PZC. The adsorbed quantity of Pb 2+ and the immersion enthalpy in solutionof different pH values for CM activated carbon showed that the values are the highest for pH 4, 15.7mgg -1 and 27.6 Jg -1 respectively. Pb 2+ adsorption isotherms and immersion enthalpy were determinedfor modified activated carbons and the highest values were obtained for the activated carbon thatshowed the highest content of total acid sites on the surface.
Determination of carbon monoxide using a coated quartz crystal sensor
Authors: Guimarães Orliney Maciel , Zaniquelli Maria Elisabete Darbello , Castro Jorge Ricardo Moreira , Balbo Valdir Roberto , De Andrade José Fernando
Published: July 2023

Carbon monoxide was detected and determined by a piezoelectric quartz crystal sensorcoated with nickel(II)-phthalocyanine 50 % (v/v) solution in glycerine. Studies on the effect oftemperature, flow rate, and some possible interferents were carried out. Calibration curves, sensorstability (lifetime) and the precision of measurements were also verified. The resulting selectivity isprobably due to the coordinative binding between the electronically unsatured metal complexes and theanalyte. The analytical curve is linear in the concentration range 0.10 to 1.0 % (v/v).
Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid
Authors: Da Silva Lucinei Stechmann , Oliveira Tiago Nieswald , Ballin Marco Aurélio , Peixoto Carlos Roberto de Menezes
Published: July 2023

An amperometric sensor was constructed, by using humic acids to immobilize Fe 3+ ions on a carbon paste electrode (CPE-HA-Fe), and used for ascorbic acid (H 2 A) determination. The cyclic voltammogram of the electrode showed electrochemical response due to the Fe 3+ /Fe 2+ couple at E 1/2 =+0.78 V vs SCE, using 0.5 mol L -1 KCl and 0.2 mol L -1 acetate/0.020 mol L -1 phosphate buffer, at pH = 5.4, as supporting electrolyte. When H 2 A is added to the electrolyte solution it is observed an oxidation process. The oxidation current, obtained by chronoamperommetry at +0.87 V vs SCE, is proportional to the concentration, represented by the equation I(μA) = 7.6286 [H 2 A] (mmol L -1 ) + 1.9583, r = 0.9996, for concentrations between 0.0 and 1.4 mmol L -1 . The electrode showed high stability and was used for H 2 A determination in a natural orange juice.
Sensitive spectrophotometric assessment of carbofuran using dapsone as a new chromogenic reagent in formulations and environmental samples
Authors: Nagaraja Padmarajaiah , Bhaskara Besagarahally L.
Published: July 2023

A simple, sensitive and selective spectrophotometric method for the assessment of carbofuranin various formulations and in environmental water samples is described. The method is based on thecoupling of hydrolyzed carbofuran with diazotized dapsone in alkaline medium at 0 – 4° C which givesorange red colored product having the absorption maximum at 480 nm. The product is stable for 48 h.Beer’s law is obeyed in the concentration range of 0.1 – 4.0 μg ml -1 . The molar absorptivity and Sandell’sSensitivity are 5.0 x 10 4 L mol-1 cm -1 and 4.4 ng cm -2 respectively. The method is highly reproducibleand is confirmed by RSD values (1.144 %). From the recovery studies it is found that this method isaccurate and it can be successfully employed for the determination of carbofuran.
Determination of hydroquinone in a square wave voltammetry procedure using a graphite-polyurethane composite electrode
Authors: Cervini Priscila , Cavalheiro Éder Tadeu Gomes
Published: July 2023

In order to a better characterization of a graphite-polyurethane composite intended to be used as a voltammetric sensor, the performance in a square wave voltammetric procedure was investigated. Using hydroquinone (HQ) as a probe, the electrode showed to be useful in square wave voltammetry with limit of detection of 0.28 µmol L-1, with recoveries between 99.1 and 101.5%. The results of the proposed method agreed with HPLC ones within 95% confidence level.
Evaluation of the dioxin and furan formation thermodynamics in combustion processes of urban solid wastes
Authors: Moreno-Piraján Juan Carlos , García-Ubaque César Augusto , Fajardo R. , Giraldo Liliana , Sapag Karim
Published: July 2023

Specific combustion programs (Gaseq, Chemical equilibria in perfect gases, Chris Morley)are used to model dioxin and formation in the incineration processes of urban solid wastes. Thanks tothese programs, it is possible to establish correlations with the formation mechanisms postulated in li-terature on the subject. It was found that minimum oxygen quantities are required to obtain asignificant formation of these compounds and that more furans than dioxins are formed. Likewise,dioxin and furan formation is related to the presence of carbon monoxide, and dioxin and furandistribution among its different compounds depends on the chlorine and hydrogen relativecomposition. This is due to the fact that an increased chlorine availability leads to the formation ofcompounds bearing a higher chlorine concentration (penta-, hexa-, hepta-, and octachlorides), whereasan increased hydrogen availability leads to the formation of compounds bearing a lower chlorinenumber (mono, di-, tri-, and tetrachlorides)
Determinação de biureto em uréia agroindustrial por espectrofotometria
Authors: Ferreira Roberta Borges , Franzini Vanessa Pezza , Gomes Neto José Anchieta
Published: July 2023

Foi desenvolvido um método espectrofotométrico para a determinação de biureto em ferti-lizantes à base de uréia empregando Cu(OH) 2(s) como reagente analítico.O método se baseia na reação entre biureto e Cu(OH) 2(s) e formação do complexo Cu(C 2 N 3 O 2 H 5 ) 2 decoloração violeta cujo espectro apresenta máximo de absorção em 510 nm. Após o estabelecimento dasmelhores condições analíticas, o método proposto foi aplicado na determinação de biureto em duasamostras comerciais de uréia, uma para pecuária e outra para agricultura. Curvas analíticas construí-das no intervalo de concentrações de 0,1 a 0,5% (m/v) em biureto produziram coeficientes de corre-lação típicos ≥ 0,9990. Os resultados obtidos pelo método proposto foram concordantes ao nível de95% de confiança com os obtidos por um método alternativo empregando espectrometria de absorçãoatômica. A exatidão do método foi também avaliada por meio de testes de adição e recuperação depadrão. Recuperações de 92 a 100% foram obtidas e o desvio padrão relativo calculado para 12 medi-das sucessivas de uma amostra contendo 0,31% (m/v) foi 2%.
Spectrophotometric determination of lansoprazole in pharmaceuticals using bromate-bromide mixture based on redox and complexation reactions
Authors: Basavaiah Kanakapura , Ramakrishna Veeraiah , Anilkumar Urdigere Rangachar , Somashekar Bankavadi Chikkaswamy
Published: July 2023

Two sensitive spectrophotometric methods are described for the determination oflansoprazole (LPZ) in bulk drug and in capsule formulation. The methods are based on the oxidation oflansoprazole by insitu generated bromine followed by determination of unreacted bromine by twodifferent reaction schemes. In one procedure (method A), the residual bromine is treated with excess ofiron (II), and the resulting iron (III) is complexed with thiocyanate and measured at 470 nm. The secondapproach (method B) involves treating the unreacted bromine with a measured excess of iron (II) andremaining iron (II) is complexed with orthophenanthroline at a raised pH, and measured at 510 nm. Inboth methods, the amount of bromine reacted corresponds to the amount of LPZ. The experimentalconditions were optimized. In method A, the absorbance is found to decrease linearly with theconcentration of LPZ (r = -0.9986) where as in the method B a linear increase in absorbance occurs (r= 0.9986) The systems obey Beer’s law for 0.5-4.0 and 0.5-6.0 μg mL -1 for method A and method B,respectively. The calculated molar absorptivity values are 3.97μ10 4 and 3.07μ10 4 L mol -1 cm -1 formethod A and method B, respectively, and the corresponding Sandell sensitivity values are 0.0039 and0.0013 μg cm -2.
Potentiometric and conductometric studies on the system acid-isopolytungstate and the formation of lanthanum tungstates
Authors: Prasad Saradh , De Santana Renato Alexandre Costa , Campos Ana Regina Nascimento , Leite Valderi Duarte
Published: July 2023

The stoichiometry of the polyanions formed by the action of nitric acid on sodium tungstate(≤ 0.01M) has been studied by means of electrometric techniques involving pH-potentiometric andconductometric titrations. The well defined inflections and breaks in the titration curves provideevidence for the existence of the polyanions, para-W 12 O 4110- and meta-W 12 O 396- corresponding to theratio of H + :WO 42- as 7:6 and 9:6 in the pH ranges 5.7-6.0 and 3.6-4.1, respectively. The interaction oflanthanum nitrate with sodium tungstate solutions, at specific pH levels 8.0, 5.9 and 4.0 was alsostudied by pH and conductometric titrations, in aqueous and alcoholic media, with each of the reagentsalternatively used as titrant. The electrometric experiments provide definite evidence of the formationof normal-La 2 O 3 .3WO 3 , para-5La 2 O 3 .36WO 3 and meta-La 2 O 3 .12WO 3 tungstates in the vicinity of pH6.3, 5.0 and 4.2, respectively. Analytical investigations on the precipitates formed confirm the resultsof the electrometric study.
Synthesis, characterization and thermal studies on solid state 3-methoxybenzoate of lighter trivalent lanthanides
Authors: Dametto Patrícia Roberta , De Siqueira Adriano Buzutti , De Carvalho Cláudio Teodoro , Ionashiro Massao
Published: July 2023

Solid-state Ln -3-MeO-Bz compounds, where Ln stands for lighter trivalent lanthanides (La –Sm) and 3-methoxybenzoate, have been synthesized. Thermogravimetry (TG), differential scanningcalorimetry (DSC), X-ray powder diffractometry, infrared spectroscopy, and complexometry were usedto characterize and to study the thermal behaviour of these compounds. The results led to informationconcerning the composition, dehydration, polymorphic transformation, thermal behaviour and thermaldecomposition of the synthesized compounds.
Crystal structures of 5-chloro-2-methoxybenzoates of Mn(II), Co(II), Ni(II) and Zn(II)
Authors: Stępniak Krystyna , Ferenc Wieslawa , Cristóvão Beata , Lis Tadeusz
Published: July 2023

The crystal and molecular structures of [bis(5-chloro-2-methoxybenzoate)tetraaquamanganese(II)], [pentaaqua(5-chloro-2-methoxybenzoato)cobalt(II)] (5-chloro-2-methoxybenzoate), [pentaaqua(5-chloro-2-methoxybenzoato)nickel(II)] (5-chloro-2-methoxybenzoate) and [aquabis(5-chloro-2-methoxybenzoate)zinc(II)] monohydrate were determined by a single-crystal X-ray analysis. Mn(H2O)4L2 (where L = C8H6ClO3) crystallizes in the monoclinic system, space group P21/c. [Co(H2O)5L]L and [Ni(H2O)5L]L both are isostructural, space group P212121. The crystals of [Zn(H2O)L2] H2O are monoclinic, space group Pc. Mn(II) ion is positioned at thecrystallographic symmetry center. Mn(II) and Co(II) ions adopt the distorted octahedral coordinationbut Zn(II) tetrahedral one.The carboxylate groups in the complexes with M(II) cations function asmonodentate, bidentate and/or free COO-groups. The ligands exist in the crystals as aquaanions. Thecomplexes of 5-chloro-2-methoxybenzoates with Mn(II), Co(II) and Zn(II) form bilayer structure.
Efeito do íon malato no processo de oxidação do ácido ascórbico por oxigênio molecular catalisado por íons cobre(II)
Authors: Da Silva Lucinei Stechmann , Vicenzi Raul , Peixoto Carlos Roberto Menezes
Published: July 2023

Íons cobre(II) catalisam a oxidação de ácido ascórbico por oxigênio molecular. O mecanismoenvolve a coordenação dos reagentes ao íon metálico. Íons malato, quando presentes, também secoordenam ao cobre(II) e inibem o efeito catalítico. As constantes cinéticas específicas (k / mol -1 L min. -1) da reação em presença de íons malato são 46,58, 7,11 e 30,00 em valores de pH de 3,5, 4,5 e 5,8,respectivamente. Existe decréscimo do valor de k com o aumento do pH de 3,5 para 4,5, o que está deacordo com a coordenação mais efetiva do malato ao cobre(II).
Constituintes químicos isolados dos caules de Michelia champaca L. (Magnoliaceae)
Authors: Monteiro Maisa Cristina Morais , Leptocarydis Ioanis Hcristos , Da Silva Geraldo Humberto , Da Silva Viviane Cândida , Bolzani Vanderlan da Silva , Young Maria Cláudia Marx , Lopes Márcia Nasser
Published: July 2023

O fracionamento cromatográfico da fase diclorometânica dos caules de Micheliachampaca, forneceu quatro substâncias: álcool 4-O-β-D-glicopiranosídeo sinapílico, aldeído4-O-β-D-glicopiranosídeo sinápico, siringaresinol e N-acetilnonaina. Extração ácido-basede uma nova porção do extrato bruto etanólico permitiu a identificação do alcalóide liriodenina.Os derivados fenilpropanoídicos e o alcalóide N-acetilnonaina estão sendo descritos pelaprimeira vez no gênero Michelia. O alcalóide liriodenina e a lignana siringaresinol apresentaramatividade antifúngica moderada.
Synthesis and magnetic properties of heteronuclear 3d-4f compound
Authors: Cristóvão Beata , Ferenc Wieslawa
Published: July 2023

A novel heteronuclear 3d-4f compound having formula NdCu 3 L 3 ·13H 2 O (whereH 3 L = Schiff base derived from 5-bromosalicylaldehyde and glycylglycine andL 3– = C 11 H 8 N 2 O 4 Br) was obtained. It was characterized by elemental and thermal analysesand magnetic measurements. The Cu(II)–Nd(III) compound is stable up to 323 K. Duringdehydration process the water molecules are lost in two stages. The magnetic susceptibilitydata for this complex change with temperature according to the Curie-Weiss law withΘ = -35 K. The magnetic moment values decrease from 5.00 μ B at 303 K to 4.38 μ B at76 K.
Direct determination of Calcium in milk by atomic absorption spectrometry using flow-injection analysis
Authors: Petrovich Marielsa Businaro , Amorim Filho Volnei Resta , Gomes Neto José Anchieta
Published: July 2023

A flow-injection system with sample and reagent addition by the synchronousmerging zones approach for calcium determination in milk by flame AAS is proposed. Mainparameters were optimized using a factorial design with central point. The optimum conditionswere 2.5% (m/v) for La concentration, 8 mL min -1 for the carrier flow-rate, 20 cm for coiledreactor and 250 ìL for sample volume. Different sample preparation procedures were evaluatedsuch as dilution in water or acid and microwave-assisted decomposition using concentratedor diluted acids. The optimized flow system was applied to determine Ca in eleven commercialmilk samples and two standard reference materials diluted in water. Similar calcium levelswere encountered comparing the results obtained by the proposed method (dilution in water)with those obtained using microwave-oven digestion. Results obtained in two standard referencematerials were in agreement at 95% confidence level with those certified. Recoveries of spikedsamples were in the 93% - 116% range. Relative standard deviation (n = 12) was < 5.4%and the sample throughput was 150 measurements per hour, corresponding to a consumptionof 250 μL of sample and 6.25 mg La per determination.
Allelopathic potential and systematic evaluation of secondary compounds in extracts from roots of Canavalia ensiformis by capillary electrophoresis
Authors: Dos Santos Sonia , De Moraes Maria de Lourdes Leite , Rezende Maria Olimpia de Oliveira
Published: July 2023

Organic extracts were obtained from roots of Canavalia ensiformis and evaluated for allelo-pathic potential on the germination of the weed seeds: Mimosa pudica, Cassia tora and Cassia occi-dentalis showing a strong allelopathic potential. After that, a systematic study of these crude extractswas made using specific protocols developed in capillary electrophoresis (CE) in order to determinesome classes of secondary metabolites. Capillary electrophoresis protocols were highly specific, whichmakes it possible to identify 5 classes of compounds using the same crude extract samples and analyzethem fartly. Some of the compounds identified show activity in the inhibition of seeds germination.
Influência de argilas pilarizadas na decomposição catalítica do óleo de andiroba
Authors: Guerra Denis de Jesus Lima , Lemos Vanda Porpino , Angélica Rômulo Simões , Airoldi Claudio
Published: July 2023

Amostras de esmectitas oriundas do estado do Pará, região amazônica, Brasil, foram usadasem processo de pilarização no presente estudo. As matrizes pilarizadas e natural foram caracterizadasusando DRX e analise textural usando isotermas de adsorção-desorção de nitrogênio. Os íons de inter-calação (Al 13 , Ti, Zr) foram obtidos através de reações químicas com soluções de AlCl 3 6H 2 O/ NaOH,etoxido de titânio/HCl, acetato de zircônio / HCl. Os resultados obtidos com o processo de pilarizaçãoapresentaram aumento do espaçamento basal de 15,6 para 20, 64 Å e área superficial de 44 para 358m 2 /g (Zr-PILC). A estabilidade térmica da argila natural foi melhorada com o processo de pilarização.O material resultante foi submetido a um processo catalítico de decomposição do óleo de andiroba emum reator de leito fixo a 673 ± 1 K. A atividade catalítica foi determinada pelo produto de decom-posição resultante da reação química. Os parâmetros físico-químicos foram obtidos usando DRX,FTIR e análise textural. As argilas pilarizadas apresentaram alta acidez de Brønsted, com alta concen-tração de hidrocarbonetos aromáticos e baixa concentração de hidrocarbonetos alifáticos.
Estudo da presença da toxina microcistina-LR em água utilizada em clínica de hemodiálise e validação de um método análítico
Authors: Sanches Sergio Marcos , Vieira Eny Maria , Do Prado Eliana Leão , Benetti Fernanda , Takayanagui Angela Magosso
Published: July 2023

Algumas cepas de algas, em especial as cianobactérias, podem produzir toxinas como asmicrocistinas, as quais podem ocasionar intoxicação e morte de seres humanos e de animais. A lite-ratura reporta a ocorrência de um acidente em uma clínica de hemodiálise de Caruaru, Pernambuco,aonde vieram a falecer 60 pacientes que faziam hemodiálise, devido à presença da toxina microcisti-na-LR na água. Nesse estudo foi desenvolvido e validado um método analítico, para a determinação equantificação da microcistina-LR. A cromatografia líquida de alta performance com detector de UV foiempregada como técnica analítica para a determinação de microcistina-LR. Os parâmetros seleciona-dos para a validação do método foram: linearidade, curva analítica, precisão, sensibilidade e ensaiosde recuperação. A curva analítica foi construída com sete pontos a partir do padrão. O método apre-sentou uma linearidade no intervalo de 0,05 a 5 μg L -1 , e o coeficiente de correlação foi superior a 0,99.Com base nestes resultados conclui-se que o método é eficiente e pode ser empregado, em futurasanálises, para o monitoramento da microcistina-LR em água utilizada em clínicas de hemodiálise.
Synthesis, characterization and thermal behaviour on solid pyruvates of light trivalent lanthanides
Authors: De Siqueira Adriano Buzutti , De Carvalho Cláudio Teodoro , Rodrigues Emanuel Carlos , Ionashiro Elias Yuki , Bannach Gilbert , Ionashiro Massao
Published: July 2023

Solid State Ln-L compounds, where Ln stands for light trivalent lanthanides(La – Gd) and L is pyruvate, have been synthesized. Thermogravimetry and derivative thermo-gravimetry (TG/DTG), differential scanning calorimetry (DSC), X-Ray powder diffractometry,infrared spectroscopy, elemental analysis, and complexometry were used to characterize and to studythe thermal behaviour of these compounds. The results led to information about the composition, dehy-dration, ligand denticity, thermal behaviour and thermal decomposition of the isolated compounds.
Spectrophotometric determination of mosapride in pure and pharmaceutical preparations
Authors: Revanasiddappa Hosakere Doddarevanna , Veena M. A.
Published: July 2023

Two simple and sensitive spectrophotometric methods (M 1 and M 2 ) for the determination ofmosapride in pure and in pharmaceutical preparations are described. These methods are based on theinteraction of diazotized mosapride (MSP) couples with chromotropic acid (CTA) [M 1 ] in alkalinemedium and diphenylamine (DPA) [M 2 ] in acidic medium. The resulting azo-dyes exhibit maximumabsorption at 560 nm and at 540 nm for methods M 1 and M 2 , respectively. All variables were studiedin order to optimize the reaction conditions. No interferences were observed from excipients, and thevalidity of the each method was tested against reference method.
A simple spectrophotometric method for the determination of methyldopa using p-chloranil in the presence of Hydrogen Peroxide
Authors: Gotardo Mara Andréia , Lima Liliane Spazzapam , Sequinel Rodrigo , Rufino José Luiz , Pezza Leonardo , Pezza Helena Redigolo
Published: July 2023

A simple, rapid and sensitive spectrophotometric method has been developed for the determination of methyldopa in pharmaceutical formulations. The method is based on the reaction between tetrachloro-p-benzoquinone (p-chloranil) and methyldopa, accelerated by hydrogen peroxide (H2O2), producing a violet-red compound (λmax = 535 nm) at ambient temperature (25.0 ± 0.2 0C). Experimental design methodologies were used to optimize the measurement conditions. Beer’s law is obeyed in a concentration range from 2.10 x 10-4 to 2.48 x 10-3 mol L-1 (r = 0.9997). The limit of detection was 7.55 x 10-6 mol L-1 and the limit of quantification was 2.52 x 10-5 mol L-1. The intraday precision and interday precision were studied for 10 replicate analyses of 1.59 x 10-3 mol L-1 methyldopa solution and the respective coefficients of variation were 0.7 and 1.1 %. The proposed method was successfully applied to the determination of methyldopa in commercial brands of pharmaceuticals. No interferences were observed from the common excipients in the formulations. The results obtained by the proposed method were favorably compared with those given by the Brazilian Pharmacopoeia procedure at 95 % confidence level.
Dinâmica molecular: teoria e aplicações em planejamento de fármacos
Authors: Namba Adriana Mieco , Da Silva Vinícius Barreto , Da Silva Carlos Henrique Tomich de Paula
Published: July 2023

Dinâmica Molecular (DM) é uma ferramenta computacional poderosa usada em Química Medicinal para o planejamento racional de fármacos. DM é uma extensão da Mecânica Molecular, onde o comportamento dinâmico de um sistema molecular é simulado através da integração numérica das equações de movimento. Esta técnica tem sido usada extensivamente para auxiliar e complementar o planejamento de novos ligantes de um alvo terapêutico, bem como estimar a sua potência. Este artigo enfoca a teoria básica da DM clássica e suas importantes aplicações no planejamento racional de potenciais compostos bioativos, particularmente compostos com atividade anti-HIV.
Thermodynamic quantities of solvation and dilution for some acetanilide derivatives in octanol and water mutually saturated
Authors: Baena Yolima , Barbosa Helber , Martínez Fleming
Published: July 2023

Based on published thermodynamic quantities for solution, partitioning and sublimation of acetanilide (ACN), acetaminophen (ACP) and Phenacetin (PNC), the thermodynamic quantities for drugs solvation in octanol-saturated water (W(ROH)) and water-saturated octanol (ROH(W)) as well as the drugs dilution in ROH(W) were calculated. The Gibbs energies of solvation were favourable in all cases. The respective enthalpies and entropies were negative indicating an enthalpy-driving for the solvation process in all cases. On the other hand, the Gibbs energies of dilution were favourable for ACP and PNC but unfavourable for ACN, whereas the respective enthalpies and entropies were negative for ACP and PNC but positive for ACN indicating enthalpy-driving for the dilution process in the case of the former drugs and entropy-driving for the latter. From the obtained values for the transfer processes, an interpretation based on solute-solvent interactions was developed.
Spectrophotometric determination of metronidazole through Schiff’s base system using vanillin and PDAB reagents in pharmaceutical preparations
Authors: Siddappa Kuruba , Mallikarjun Metre , Reddy Tukaram , Tambe Mahesh
Published: July 2023

Two simple sensitive and reproducible spectrophotometric methods have been developed for the determination of metronidazole either in pure form or in their tablets. The proposed methods are based on the reduction of the nitro group to amino group of the drug. The reduction of metronidazole was carried out with zinc powder and 5 N hydrochloric acid at room temperature in methanol. The resulting amine was then subjected to a condensation reaction with aromatic aldehyde namely, vanillin and p-dimethyl amino benzaldehyde (PDAB) to yield yellow colored Schiff’s bases. The formed Schiff’s bases are quantified spectrophotometrically at their absorption maxima at 422 nm for vanillin and 494 nm for PDAB. Beer’s law was obeyed in the concentration ranges 10 to 65 μg mL-1 and 5 to 40 μg mL-1 with a limit of detection (LOD) of 0.080 μg mL-1 and 0.090 μg mL-1 for vanillin and PDAB, respectively.The mean percentage recoveries were found to be 100.05 ± 0.37 and 99.01 ± 0.76 for the two methods respectively. The proposed methods were successfully applied to determine the metronidazole in their tablet formulations and the results compared favorably to that of reference methods. The proposed methods are recommended for quality control and routine analysis.
Inhibitors of Clostridium histolyticum colagenase
Authors: Leite Sérgio Roberto de Andrade
Published: July 2023

Different substances were tested as inhibitors of Clostridium histolyticum collagenase, both experimental and theoretically. The in vitro collagenase activity, alone and in the presence of inhibitors, was quantified by reaction with bovine collagen and dosage of the releasing amino acids. Collagenaseinhibitor interaction was studied theoretically by docking computational calculations. Only one among the tested substances showed inhibitor activity against the bacterial collagenase.
Desenvolvimento e aplicação de método GC-MS/MS para análise simultânea de 17 HPAs em material particulado atmosférico
Authors: Cristale Joyce , Silva Flavio Soares , De Marchi Mary Rosa Rodrigues
Published: July 2023

Os hidrocarbonetos policíclicos aromáticos (HPAs) estão associados ao aumento da incidência de diversos tipos de cânceres no homem. Essas moléculas são formadas principalmente na queima incompleta de matéria orgânica, sendo encontradas em todos os compartimentos ambientais. Órgãos regulamentadores das áreas ambiental e de saúde ocupacional consideram 17 HPAs como contaminantes atmosféricos prioritários. Este trabalho apresenta um método para análise simultânea destes HPAs utilizando-se a cromatografia a gás acoplada à espectrometria de massas operando no modo tandem (GC-MS/MS). Os limites de detecção e quantificação do método mostraram-se até 5 vezes inferiores aos obtidos no método GC-MS (SCAN). O método mostrou-se seletivo para análise de HPAs em extratos de amostras de material particulado atmosférico. Uma análise comparativa de dois sistemas de solventes (diclorometano/metanol 4:1 v/v e hexano/acetona 1:1 v/v) para a extração de HPAs, utilizando amostras de material particulado atmosférico, revelou que ambas as misturas de solventes possuem poder de extração semelhante. Os resultados sugerem que é possível realizar extração de HPAs de material particulado atmosférico em ultra-som com a mistura hexano/acetona (1:1), que é menos tóxica em relação à mistura diclorometano/metanol (4:1), bastante utilizada nestas análises, sem perdas significativas na exatidão do método.
Degradação hidrolítica e fotoquímica da amoxicilina na presença de β-ciclodextrina
Authors: Bariccatti Reinaldo Aparecido , Da Silva Cristiana , Souza Marcelo Alves , Lindino Cleber Antonio , Da Rosa Mauricio Ferreira
Published: July 2023

Este trabalho tem como propósito monitorar a degradação do fármaco amoxicilina na presença e ausência de β-ciclodextrina através de técnicas espectroscópicas. Para isto, foi acompanhada a hidrólise do fármaco protegido da luz por cerca de 400 horas. Os resultados obtidos indicam que, inicialmente, a ciclodextrina não altera a hidrólise da amoxicilina, entretanto, após 250 horas de monitoramento há um aumento acentuado na hidrólise da amoxicilina quando presente a ciclodextrina. Ao irradiar a amostra com radiação UV, verificamos que as soluções contendo β-ciclodextrina sofrem uma fototransformação mais lenta (26,8%) que as soluções sem β-ciclodextrina.
The Effectiveness of the Symbolic Modeling Method Helped by Profession Cartoon Puppet Media Against Language Skills and Storytelling Skills
Authors: Elyasari Siti , Buchori Achmad , Sulianto Joko
Published: July 2023

Teachers are required to be able to apply creative and innovative learning methods by utilizing media so that they can help develop students' language skills and storytelling skills. This study aims to determine the effect, learning completeness, and average difference of the symbolic modeling method assisted by professional cartoon puppet media on language skills and storytelling skills. Data collection methods used interviews, observation, and documentation. The data were processed the Manova test, learning completeness test, average difference test, and N-Gain Score test. The results showed the symbolic modeling method assisted by professional cartoon puppet media had an effect on language skills and storytelling skills, in terms of the multivariate test table and the table test of between subject effects on the manova test with each Sig. 0.000 < 0.05. The learning completeness test obtained a sig value. 0.002 on language skills and Sig. 0.032 on storytelling skills, because the value of Sig. < 0.05, it was concluded that the percentage of students who got posttest scores ≥ 75 was more than 75%. The average difference test obtained sig. 0.039 on language skills and sig. 0.001 on storytelling skills, because the value of Sig. <0.05 concluded that there is a difference in the mean of the two groups. The average N-Gain Score test is 0.71 for language skills, which is included in the high category, which means that interpretation is quite effective, and 0.67 for storytelling skills, which is included in the medium category, which means that interpretation is quite effective
Analysis and Reconstruction of Diagnostic Assessment of Negotiating Text Materials in Indonesian Language Teaching Modules Class X SMA/SMK
Authors: Agniya Agniya , Wicaksono Siraj Lintang , Setiani Hasnah , Utami Febi Putri , Zahro Afsana Noor Maulida , Naryatmojo Deby Luriawati , Wagiran Wagiran
Published: July 2023

Diagnostic assessment aims to identify students' competencies, weaknesses, and strengths. The results are used by educators as a reference in planning learning according to the learning needs of students. The adequacy of the diagnostic assessment was assessed through analytical activities. This study aims to determine the effectiveness of the diagnostic assessment prepared by educators in three teaching modules, namely the negotiating text teaching module for SMA Negeri 4 Palembang, SMA Negeri 2 Ungaran, and SMA Negeri 1 Bae Kudus. The research method used in this research is the descriptive method. This study uses the data analysis technique of the Miles and Huberman model, which includes data reduction, data presentation, and conclusion. The analysis results include component analysis of the suitability of learning objectives, learning content, and cognitive level. Furthermore, it shows that two of the three teaching modules are compatible with the objectives and learning content. The questions for the diagnostic text in the three teaching modules still apply the Low Order Thinking Skills (LOTS) level. Diagnostic assessment discrepancies in the teaching modules are then reconstructed so that the assessment has good criteria.
Contribution of the Leo Kristi “Fanbase” Folk Concert Community in Ballad Music in Indonesia ( 1980-2010 )
Authors: Cipta Samudra Eka , Sunarti Linda
Published: July 2023

This research discusses about the people's concert community of Leo Krissi in the development of ballad music in Indonesia.Leo kristi people concert has its own uniqueness which is to be a wrong fan of leo kristi who is considered royal and radical. This study uses a historical approach.Limit for this study is taken in the period 1980-2010 ).Whereas 1980 was where the period of leo kristi has started to be known by his fans.Whereas, The findings in this study are about the loyalty of the producers of leo kristi who always help in the form of materials to help the process of the development of the people's concert of leo kristi.Researchers took the final limit in 2014 which constitutes the Last of  Leo Kristi folk concert held in Surabaya with the title of the last of Leo Kristi concert i Rumput Kemesraan Konser Rakyat Leo Kristi. The conclusion is that Leo Kristi is a musician who is respected by his fans so they are willing to help develop the Leo Kristi Folk Concert.
Development of General Arithmetic E-Module Based on APOS Theory to Improve Problem Solving Ability and Independence in Middle School and High School Students
Authors: Aditya Resa Septian , Sukestiyarno YL , Cahyono Adi Nur
Published: July 2023

To learn about other parts of math, like how to work with numbers, you need to know arithmetic. The characteristics and concepts in mathematics are interrelated, therefore students need to acquire an introductory or basic grasp to assist in developing math skills (even if operations are considered basic stuff). This comprehension lays the groundwork for the acquisition of other mathematical talents, including problem-solving skills, which are crucial to a kid's success in school. Students and teachers alike rely heavily on online resources, yet this resource is not fully utilized in today's educational systems. In addition, not all online e-modules meet the standards of good e-modules, which results in subpar learning and makes it harder to accomplish certain educational goals. The goal of this research is to create an expert-based, user-friendly, and practical e-module for teaching elementary school mathematics that incorporates APOS theory in order to improve students' ability to learn independently and solve problems. This type of research is Design Research with the type of development studies divided into three phases, namely Preliminary research, Development or prototyping phase, and Assessment phase. Students from SMP Negeri 1 Winong, and MA Darul Ma'la made up the research sample. The data was gathered through a combination of tests, questionnaires, interviews, and observations. The study's findings demonstrate that the generated e-modules are of sufficient quality in terms of being valid, practical, and effective. validated by material experts and media experts, including lecturers and teachers, so that this e-module is considered valid by material experts and media experts, practical by lecturers, teachers, and students who use it through questionnaires, and effective based on problem-solving abilities and student learning independence after implementation.
The Influence of Lunges and Rubber Load Exercises on Ap Chagi Kick Speed in UNTAD Taekwondo Club (UTC) Athletes
Authors: Marhadi Marhadi
Published: July 2023

The purpose of this study was to determine whether there was an effect of lunges training and rubber loads on Ap Chagi kick speed in UNTAD Taekwondo Club athletes who were the samples in this study. The method used in this research is an experimental method with a two-group pretest-posttest design. The research location is in the Mayor's Field. The population of this study was 20 athletes, so that the sampling was carried out using total sampling technique. Based on the calculation results, I found that: (1) There is an effect of Lunges training on Ap Chagi Kick Speed in UNTAD Taekwondo Club Athletes. With a t count value of 7,359 > t table of 2,262 (2) There is an effect of Rubber Load training on Ap Chagi Kick Speed in UNTAD Taekwondo Club Athletes with a t count value of 9,000 > t table of 2.262 (3) there is a difference in the effect of Lunges Exercise and Rubber Load on Ap Chagi Kick Speed in UNTAD Taekwondo Club Athletes. Evidenced by the increase between the pre-test and post-test Lunges is 3.520 with a mean deviation of 0.3300. While the Rubber Load obtained an increase between the pre-test and post-test was 3.800 with a mean deviation of 0.3000. Conclusion 1). There is an effect of Lunges training on Ap Chagi kick speed in UNTAD Taekwondo Club athletes with an increase of 3.4% 2). Rubber load on Ap Chagi kick speed on UNTAD Taekwondo Club athletes with an increase percentage of 3.5%. 3). There is a difference between lunges and rubber weights on the speed of Ap Chagi kicks in UNTAD Taekwondo Club athletes by 0.1%).
Articulación curricular entre la educación media y la educación superior a partir de publicaciones realizadas en la REDALYC
Authors: Benítez González Myrian Celeste , Speratti Mendoza Hugo Matías , Rolón Violeta
Published: July 2023

El presente estudio indaga la articulación curricular entre niveles académicos medio y universitario. Para su desarrollo se definió una línea temporal entre los años 2020 y 2022. Se tomó como punto de partida la base de artículos científicos publicados en revistas en los países de América Latina y el Caribe, contenida en REDALYC. Dentro de este marco, este artículo tiene como objetivo general sintetizar la información existente en la literatura científica sobre la articulación curricular entre niveles académicos medio y universitario a partir de publicaciones realizadas en la REDALYC. Se plantea como objetivos específicos: describir la observación y cambio de la práctica educativa; explorar la flexibilidad curricular entre los niveles educativos; determinar la relevancia de la planeación didáctica, así como la relevancia de la certificación de calidad y acreditación de carreras. La muestra quedó conformada por 9 artículos relacionados a la educación secundaria y 6 artículos que abordan temas relacionados a la educación universitaria. Por consiguiente, el tamaño total de la muestra ha sido de 15 artículos en total. En términos metodológicos, se ha trabajado con un enfoque cualitativo, y de alcance descriptivo, basado en una investigación documental. Se ha llegado a la conclusión que las publicaciones revisadas utilizan categorías específicas como: situaciones de enseñanza aprendizaje, la práctica educativa, planeación didáctica, los modelos académicos, los enfoques dados, la flexibilidad curricular.