bluuebunny/crossref_metadata_2025 huggingface dataset:
EDUCAÇÃO FINANCEIRA ESCOLAR NO NOVO ENSINO MÉDIO: ANALISANDO A METODOLOGIA DE ENSINO POR INVESTIGAÇÃO NA APRENDIZAGEM DE ESTUDANTES DE UMA ESCOLA ESTADUAL DE ITAMARANDIBA/MG
Authors: Moraes Mariana Lafaiete Ferreira , Andrade Helen Rose de Castro Silva
Published: August 2024

O presente artigo tem origem de uma pesquisa de mestrado, realizada com dezenove estudantes de uma turma de 1º ano do Novo Ensino Médio, de uma escola estadual de Itamarandiba, MG. Com o intuito de entendermos como a metodologia de Ensino por Investigação pode promover uma efetiva Educação Financeira - EF para esses estudantes, desenvolvemos e aplicamos uma Se-quência de Ensino Investigativo - SEI com base nas seguintes temáticas: Vida Familiar e Cotidiana, Vida Social e Bens Pessoais. Com o desenvolvimento dessa SEI, com base em documentos norteadores e em autores, como Fernandes, Allain e Dias e, a partir das análises realizadas, verificamos ao final dessa pesquisa aplicada, que esses estudantes apresentam conceitos prévios superficiais quanto às definições e entendimento da EF. No entanto, seus Pais/Responsáveis, apresentam uma base bem delineada da mesma em seu cotidiano, que nem sempre vem sendo compartilhada com seus filhos. Todavia, interferem-se limites e possibilidades para o desenvolvimento do Ensino por Investigação, que perpassam aspectos desde a formação continuada de professores até o engaja-mento dos estudantes.
Reflexões sobre o endividamento a partir de questões do Exame Nacional do Ensino Médio
Authors: Conrado Gabriela Dutra Rodrigues
Published: August 2024

Neste artigo discute-se sobre dívidas e endividamento, assuntos caros à Educação Financeira. De tal modo, analisaram-se cinco questões do Exame Nacional do Ensino Médio e documentos orientadores de práticas de Educação Financeira com o objetivo de entender como esses materiais abordam a temática da dívida e que tipos reflexões podem ser produzidos sobre o endividamento a partir de suas análises. Adotando inspirações pós-críticas da análise do discurso para o tratamento do material, foi possível debater sobre: o papel dos conhecimentos matemáticos na Educação Financeira; os discursos em torno de regimes de verdade de que todos têm de pagar suas dívidas e gerenciamento das dívidas e empresariamento de si. Pode-se notar que os discursos em torno da dívida, com avanço do capitalismo financeiro, antes direcionados para evitá-las, na atualidade, presam por gerenciá-las. Ademais, o tom moralizante sobre o endividamento parece tocar mais fortemente as pessoas com menos recursos financeiros.
ABORDANDO A EDUCAÇÃO FINANCEIRA ATRAVÉS DO PLANEJAMENTO FAMILIAR NUMA PERSPECTIVA DE APRENDIZAGEM SIGNIFICATIVA EM TURMA DOS ANOS INICIAIS DO ENSINO FUNDAMENTAL
Authors: Oliveira Fabiola Santos Martins de Araujo
Published: August 2024

Este estudo teve como objetivo trabalhar a temática Educação Financeira a partir do planejamento familiar de estudantes dos anos iniciais do Ensino Fundamental, em especial uma turma de 5° ano do Município do Ipojuca- Pernambuco. Participaram desta pesquisa 22 alunos dos anos iniciais do Ensino Fundamental do Município do Ipojuca-PE. Para tanto, utilizamos uma sequência didática baseada na Teoria das Situações Didáticas, na qual os estudantes foram inseridos no contexto da Educação Financeira, bem como seus familiares. Os resultados mostraram que não só os estudantes, mas também seus familiares compreenderam a importância de se realizar um planejamento financeiro familiar para terem controle sobre seus gastos financeiros, sendo assim uma aprendizagem significativa, além dos muros da escola.
Condomínios residenciais e suas práticas de gestão de resíduos: um estudo de caso
Authors: Borges Jamile Guiné , Resende Daiany Cristina Costa , Figueiredo Aline Campos , Freitas Maria Oliveira de
Published: August 2024

A presente pesquisa objetiva entender quais são as práticas de gestão de resíduos nos condomínios residenciais. Para tanto, a pesquisa utilizou-se de uma metodologia qualitativa com aplicação de questionários aos representantes dos condomínios privados da cidade de Feira de Santana – BA. Dado a quantidade de retornos (4 questionários) optou-se, em segundo momento, da utilização de uma metodologia de estudo de caso múltiplo. Os resultados demonstram que os principais desafios enfrentados pelos condomínios residenciais em Feira de Santana incluem questões relacionadas à implementação de práticas sustentáveis, inclusive a disseminação de práticas de coleta seletiva. Adicionalmente, notou-se a ausência de campanhas de conscientização, incentivos e engajamento dos moradores e desconhecimento e utilização de benefícios socioambientais disponíveis e garantidos por Lei. Esses achados sugerem a importância de estratégias adaptativas e colaborativas para o gerenciamento eficaz desses espaços urbanos.
Fluxo de caixa da mineradora Vale e comportamento das ações - variação do preço da commodity
Authors: Santos Ana Carolina Belarmino dos , Nunes Rodolfo Vieira , Torquato Matheus
Published: August 2024

O Brasil é, predominantemente, um país exportador e a maior parte de suas mercadorias comercializadas são commodities. Essas mercadorias estão sujeitas a significativas oscilações de seus preços, uma vez que eles são definidos pela lei de oferta e demanda do mercado mundial. Surge assim, o questionamento de qual seria o impacto da volatilidade do preço da commodity minério de ferro no fluxo de caixa de uma empresa brasileira que atua na exportação desse produto. Para realizar esse estudo de caso, iremos focar na mineradora Vale e analisar a relação entre o comportamento do fluxo de caixa da organização e a variação no preço do minério de ferro, observando o período de 2013 a 2022. O resultado demonstra que um aumento ou uma redução do IODEX, causa um impacto diretamente proporcional no EBITDA e na receita operacional da empresa, e que se comprova uma correlação positiva e forte entre o preço de minério de ferro e das ações da Vale. Com base nas evidências, concluiu-se que, embora haja uma correlação entre as duas variáveis, é necessária uma análise mais aprofundada dos resultados financeiros e de suas rubricas, a fim de entender com maior precisão o grau dessa correlação.
Dividend policy in the brazilian education sector: influence of free flow cash
Authors: Silva Alexandre da
Published: August 2024

O objetivo deste estudo é verificar se as empresas do setor privado de educação possuem fluxo de caixa como os demais setores e se o fluxo de caixa deste setor está relacionado ao rendimento. Metodologia: Os dados foram coletados de empresas de capital aberto listadas na Bolsa de Valores de São Paulo (B3) entre os anos de 2018 e 2021. O setor de educação (grupo EDUC) foi comparado com as demais empresas listadas na B3 (grupo OUTROS). Resultados: não foi encontrada associação entre rendimento e variação anual do fluxo de caixa (DFCL) nas empresas de capital aberto listadas na B3, tanto do grupo EDUC quanto do grupo OUTROS. Além disso, não houve diferenças entre os grupos quanto ao DFCL, rendimento e variação do preço das ações. Esses achados podem mostrar que o setor privado de ensino superior brasileiro segue os mesmos padrões dos demais setores avaliados, o que fala a favor da mercantilização da educação.
LEVANTAMENTO DE DADOS EPIDEMIOLÓGICOS SOBRE OS PACIENTES CHAGÁSICOS DO LABORATÓRIO DE DOENÇA DE CHAGAS ELIAS BOAINAIN DO INSTITUTO DANTE PAZZANESE DE CARDIOLOGIA
Authors: Villegas Magalhães Walkyria ,   Instituto Dante Pazzanese de Cardiologia, Lourenço Angela Maria , Castro Faccini Cristiane , Fragata Filho Abilio Augusto , Pires de Oliveira Sérgio Miguel ,   Instituto Dante Pazzanese de Cardiologia,   Instituto Dante Pazzanese de Cardiologia,   Instituto Dante Pazzanese de Cardiologia,   Instituto Dante Pazzanese de Cardiologia
Published: August 2024

Introdução: A Doença de Chagas (DC) evidencia-se na América Latina como endemia de grande impacto sobre a morbimortalidade. No Brasil, destaca-se dentre as doenças crônicas, acometendo cerca de 1,2 milhão de indivíduos. O objetivo deste trabalho foi reunir informações sobre características físicas, biológicas e sociais dos pacientes chagásicos do Instituto Dante Pazzanese de Cardiologia que visitaram o Laboratório de Doença de Chagas Elias Boainain entre novembro de 2017 e novembro de 2018. Método: Os 100 pacientes que aceitaram participar deste estudo responderam aos questionários para obtenção de dados como idade, sexo, etnia, naturalidade e informações a respeito do diagnóstico e tratamento da DC, bem como a respeito de sua qualidade de vida. Após a coleta, os dados foram analisados por meio do software estatístico IBM SPSS Statistics 20. Resultados: A maioria dos pacientes é idosa, de etnia branca, que nasceu e passou os primeiros anos de vida em casas de pau-a-pique, o que corrobora com o fato de 62% dos pacientes afirmarem terem adquirido a DC por transmissão vetorial. A distância, obtenção de medicamentos e atendimento por funcionários estão entre as dificuldades encontradas pelos pacientes que, em sua maioria, possui, no mínimo, condições razoáveis quanto a sua capacidade funcional, vitalidade, saúde mental e aspectos sociais, físicos e emocionais, apesar de terem, em geral, uma percepção negativa quanto ao próprio estado de saúde. Conclusão: Os resultados obtidos permitiram a percepção da falta de informação e conhecimento das pessoas a respeito da DC até um passado muito recente na história do nosso país.
Clinical assessment of tibiofemoral angle and its relationship with body mass index
Authors: Nnyagu Henry  , Obiegbu Henry Obinna  , Anyaehie Udo  , Ikeabba Henry
Published: August 2024

Background: Few studies have investigated BMI as a factor that might influence the physiological development of knee alignment in otherwise healthy normal weight and overweight children and adolescents. Objective: This study set out to determine the relationship between tibiofemoral angle and body mass index in normal children and adolescents in Enugu metropolis. Methodology: This cross-sectional study was done in Enugu metropolis with 3147 school children and adolescents aged 3-17years. The tibiofemoral angle was measured clinically using standard goniometer with extendable arms. The weight, height, BMI percentile-for-age, were determined for all the subjects. The association between tibiofemoral angle and body mass index was then analyzed. Results: Majority of the subjects (97.6%) had valgus TFA. The maximum knee valgus angle was 6.8o±0.80o at 4 years which then declined to a mean of 2⁰ at 17 years. 91.2% of the subjects examined were normal weight(5th-85th percentile), 6.2% underweight(< 5th percentile) and 2.5% overweight( 85th - 95th and > 95th percentile). The tibiofemoral angle was found to have a significant negative correlation with BMI in normal weight and overweight subjects. Conclusions: We found a significant negative correlation between TFA and BMI in normal healthy weight and overweight children and adolescents. Thus, increasing BMI does not cause a corresponding increase in the magnitude of the knee angle.
Pengendalian Waktu dan Biaya pada Proyek Gedung TPQ 2 Lantai dengan Metode Time Cost Trade Off (TCTO)
Authors: Mudhoffar Fahmi , Prafitasiwi Avisha Gita
Published: August 2024

Penelitian ini bertujuan untuk mengetahui bagaimana percepatan waktu pelaksanaan proyek di gedung TPQ ini dengan menganalisa biayanya sehingga dapat dengan mudah mengetahui dengan menggunakan metode TCTO. Lalu hasil perhitungan menunjukan percepatan ini menggunakan alternatif penambahan di jam kerja lembur dan alternatif penambahan di tenaga kerja, alternatif penambahan di jam kerja lembur ini dapat membuat berkurangnya durasi menjadi 16 hari atau sebesar 15,5% dari durasi normal awalanya 248 hari. Pada alternatif jam kerja lembur dihasilkan penambahan biaya sebesar Rp. 2.368.499.940 dari total cost normal sebesar Rp. 2.127.671.700 dengan efisiensi 8,83%. Sementara itu pada alternatif penambahan di tenaga kerjanya dapat membuat berkurangnya durasi menjadi 26 hari atau sebesar 9,54% dari durasi normal yang awalnya 248 hari. Pada alternatif tenaga kerja dihasilkan penambahan biaya sebesar Rp. 2.356.257.677 dari total cost normal sebesar Rp. 2.127.671.700 dengan efisiensi 9,31%. Sehingga dalam penelitian ini dapat diperolah untuk alternatif penambahan di tenaga kerja lebih baik dibanding alternatif penambahan di jam kerja lembur.
Separation Of Copper And Chromium Metal In Ultrabasic Rocks From Top Of Manoapa Region, Subdistrict Of Lasusua Southeast Sulawesi By Ligand of 2 - (Aminometil) Pyridine
Authors: Harimu La , Hasria Hasria , Intan Putri
Published: August 2024

Study on separation of ions chromium metal and copper in ultrabasic material located in the village to of Monapa subdistrict Lasusua Regency Kolaka Utara Province Sulawesi Tenggara was conducted. The aim of this study was to determine the ability of the ligand 2-(aminometil) pyridine to separate chromium metals and copper to pure metals and its application to separate the chromium metals (Cr) and copper (Cu) in ultrabasic material from the village of Puncak Monapa subdistrict Lasusua Regency Kolaka  Utara Province Sulawesi Tenggara by means of extraction method. The concentration of ions chromium metal (Cr) and copper (Cu) of the pure metals are extracted respectively 10 ppm, and the concentration of the ligand 2-(aminometil) pyridine is 10 ppm. For concentration ion chromium metal (Cr) and copper (Cu) in ultrabasic material with 20x and 30x dilution is 8.3875 and 1.3590 and 3.50 ppm and 2,001 ppm for the ions copper metal (Cu). Results of this research shomush that the ability of ligand 2-(aminometil) pyridine for extracting chromium metals (Cr) and copper (Cu) for a single pure metal has a percent extraction (%E) are respectively 79.375 % and 82.37 %. Separation ability of ions chromium metal (Cr) and ions copper (Cu) mixed are 77.625% and 79.96%. For its application in separating ions chromium metal (Cr) and copper (Cu) in ultrabasic material to 20 time dilution extraction are 74.51% and 71.35%, and 30 time dilution are 69.28% and 69.71%. Based on the results of the study ligand 2-(aminometil) pyridine is relatively better for ions copper metal (Cu) for extraction ions of pure metal and relatively similar to ultrabasic material.
Biodiesel Production From Bintanggur Oil (Callophyllum inophyllum L.) Using Calsium Oxide (CaO) Catalyst
Authors: Sutapa I Wayan , Rosmawaty Rosmawaty , Samual Ismah
Published: August 2024

The research of the biodiesel from bintanggur oil (Calophyllum inophyllum L.) using calsium oxide (CaO) catalyst had been done. In this study, a two-step process was used to produce biodiesel from bintanggur oil. Initially by esterification process using H2SO4 1.25% catalyst by weight of oil and methanol with a molar ratio of 1:9 and continued by transesterification process with 1:12 (oil : methanol) with the catalyst 8 wt% CaO. The esterification and the transesterification process carried out of 2 hours and 7 nespectively at a 65 Â°C. The synthesis of biodiesel was analyzed by FT-IR spectrophotometer. The conversion of biodiesel is 44.49%. The biodiesels properties were caracterized by ASTM method. Results of biodiesels properties there are specific gravity of 0.8878 g/cm3, viscosity kinematic 5.572 cSt, flash point 176.5  Â°C, pour point 9 Â°C, cooper strip corrosion 1b, and Conradson carbon residue 2.469%.
Adsorption of Tartrazine Dye By Active Carbon from Mahagony (Swietenia Mahagoni Jacq) Rind
Authors: Tanasale Matheis F.J.D.P. , Latupeirissa Jolantje , Letelay Riwana
Published: August 2024

The adsorption of tartrazine dye on active carbon of mahagony (Swietenia mahagoni Jacq) rind has been done. Through acquired active carbon carbonations process, where was that rind at entry into furnace on temperature 500oC for 1 hour, afterwards is cooled and sieved to 50 mesh. Activation process was done through charcoal soaking in 4 M HCl solution for 15 hours and be dried on ovens at 110o C for 1 hour. After that, by the calcinations process in furnace at 450o C was streamed to gas N2 for 2 hours then analysed by X-ray diffraction (XRD) to charcoal before activation, after activation and after calcinations. Adsorption process to tartrazina dye utilize UV-Vis spectrophotometer was been done. Result of research are gotten optimum condition of active carbon which is on adsorbenâ€™s weight 1.0 g, contact time 40 minutes, pH = 3 and concentration of tartrazine dye on 30 ppm. Adsorption of tartrazine dye on the active carbon fits Freundlich's isotherm at the value correlation coefficient (r 2 ), value K F , and value n which is 98%; 0.015 and 1.186 respectively.
Histamine Content In Processed Bullet Tuna (Auxis thazard) Stew With Various Concentration Of NaCl
Authors: Hattu Nikmans , Telussa Ivonne , Fransina Eirene G. , Seumahu Cecelia A.
Published: August 2024

Analysis of histamine content in processed  bullet tuna (Auxis thazard) stew flesh can be carried out by
Spectrophotometry method, using p- phenildiazonium sulfonate reagent. A qualitative, visual comparison of
colour intensity of samples with reference colour scale of the standard solution concentration can be used to
determine levels of histamine without the aid of a spectrophotometer. The histamine content is determined
quantitatively by the standard  curve  regression  equation  (y= 0.003xâ€“0.062)  with  determination coefficient
value (R2= 0.938). The results showed that histamine content inprocessed bullet tuna (Auxis thazard)
obtained: 46.9964; 40.3093; 34.4348; 28.9900 and 24.8862 mg/100g fish, at 0.5; 1.0; 1.5; 2.0 and 2.5%
concentration of NaCl, respectively.
Adsorption of Rhodamine B Dye By Active Carbon From Durrian Shell (Durio zibethinus)
Authors: Tanasale Matheis F.J.D.P. , Sutapa I Wayan , Topurtawy Ronald R.
Published: August 2024

The research about adsorption of Rhodamine B dye by active carbon from Durian shell has been done. The active carbon gained from carbonation process which is shell of Durian put into furnace at 350 oC during 2 hours, and then being cold and sieved with 100 mesh sieves. Next process was calcinations at 450 oC C flowed by N2 gases for 2 hours then characterized with XRD spectrophotometer. Activation process is done through submerge of carbon in 3 M of KOH solution for 15 hours and dried in oven at 110 oC for 1 hour, then characterized with XRD. After that, adsorption process toward Rhodamine B dye and the result was tested using UV-Vis spectrophotometer. The results show that optimum condition from active carbon was at adsorbent weight of 0.6 g with contact time 100 minutes at pH 3.0 for adsorbs Rhodamine B concentration of 50 ppm. Adsorption of Rhodamine B dye fitted Freundlich isotherm with correlation coefficient (R2), K and n value were 97.3 %, 21.542 mg/g, and 0.405 respectively.
Effect Of Tamarind (Tamarindus indica L.) Extract To Histamine Content In Bullet Tuna (Auxis rochei)
Authors: Hattu Nikmans , Latupeirissa Jolantje , Fransina Eirene G. , Seumahu Cecelia A , Latupeirissa Astrid
Published: August 2024

The research to determine histamine content in bullet of tuna (Auxis rochei) with variation of tamarind
(Tamarindus indica L.) extract concentrations and time of marinate has been done. The histamine
content is determined quantitatively by using ultraviolet-visible spectrophotometer with the calibration
curve method. The result showed that histamine content in bullet tuna marinated in tamarind extract
with varied concentrations of 5%, 10%, 15%, and 20% within 10 minutes, are 37.4561, 35.3041,
23.8778, and 22.1186 mg/100 g respectively. While, the concentrations of histamine in bullet tuna
marinated in 20% of tamarind extract with variation of 10, 20, 30, 40, and 50 minutes, are 22.2965,
19.7544, 17.6925, 11.5865, and 8.0396 mg/100 g respectively. A qualitatively, visual comparison of
colour intensity of samples with reference colour scale of the standard solution concentration can be
used to determine concentrations of histamine without the aid of a spectrophotometer.
The Degradation of Antracene Compound Using Bacteria Isolated From Paotere Port Waterways
Authors: Mirnawati Mirnawati , La Nafie Nursiah , Dali Seniwati
Published: August 2024

The objectives of this study are (1) Determine the content of antrasena compound in the waste oil at the waterway of Paotere port (2) Determine the characteristics of antrasena degradation bacteria and  (3) Determine the percentage of antrasena degradation. In this research an analysis of antrasena compound was conducted with sea water that had been polluted with oil. The next steps were to isolate and characterize the degrading bacteria of antrasena and to analyze the results of antrasena degradation. The results showed that (1) Concentration of the antrasena compound in the waterway of paotere port is 4,8x10-10 ppm. (2) The bacteria can degraded of the antracene is Bacillus cereus (3) There was evidence that Bacillus cereus was able to degrade antracenr compound, the highest degradation percentage is 98,11%, it was achieved on 12 day of incubation
Sintesis Senyawa N-fenetil 4-O-asetil ferulamida dari Asam Ferulat melalui Reaksi Amidasi Tidak Langsung
Authors: Islam Muhammad Fajar , Firdaus Firdaus , Soekamto Nunuk H.
Published: August 2024

Compound N-phenetyl 4-O-asetil ferulamide had been synthesized from ferulic acid and phenetylamine through esterification and indirect amidation method. Esterification reaction of ferulic acid with anhydride acetate was done in pyridine solvent at room temperature. Indirect amidation was perform by chlorination using tionyl chloride in benzene solvent at 70Â°C and continued by amidation with phenetylamine, catalyzed by pyridine in dichloromethane solvent at room temperature. the compound obtained is brown yellowish crystal with melting point 118-120Â°C. The rendemen of target compound is 53.81%.
Ekspresi inducible Nitric Oxide Synthase (iNOS) dalam Ginjal Ikan Mas (Cyprinus carpio. L) Setelah Paparan Linear Alkylbenzene Sulfonat (LAS)
Authors: Borut Ruku
Published: August 2024

This study aims to determine the expression of iNOS in renal tissue of carp to contamination LAS (linear alkyl benzene sulfonate). The method used in this study is an experimental method using laboratory based study of molecular exploration. The experimental design used was completely randomized design (CRD), with exposure treatment LAS namely (A) 0.01 mg / L, (B) 0.02 mg / L, (C) 0.03 mg / L, (D) 0.04 mg / L, (E) 0.05 mg / L and control (without LAS). The parameters measured were the expression of inducible nitric oxide synthase (iNOS) in renal tissue cranial carp after 96 hours of exposure to LAS. Detection of iNOS in renal tissue cranial carp do with immunohistochemical methods. T-test results showed that iNOS expression in the kidney tissue cranial carp at each treatment LAS exposure was significantly higher (P <0.05) than controls. The mean value of iNOS expression in control cells was 6.25%, a 14.5% cell treatment, treatment and 21% of the cells, the cells C treatment 32.5%, 36.5% D treatment of cells, and treatment E 28.25% cell.
Mikroenkapsulasi Minyak Atsiri Dari Tanaman Nilam (Pogostemon cablin Benth) Sebagai Antijamur Candida albicans
Authors: Risnawaty Risnawaty , Nurliana Laily , Kurniawati Desy
Published: August 2024

Microencapsulation of essential oils from nilam plants (Pogostemon cablin Benth) for antifungal of Candida albicans was carried out. The aims of this study were to know of chemical components, characteristics, and activity test of nilam plants as well as the result test of microencaptulation as antifungal of C. albicans. Nilam essential oils was obtained by using water-vapor destilation with the rendament of 0.88%. Charateristics of nilam essential oils obtained produced are density of 0.947 mg/L, refractive index of 1.506, acid number of 1.122, and dissolved in alcohol 70 and 90% has conducted by Indonesia National Standar. Microencapsulation of nilam essential oils by using spray drying method with the various of  the wrapper material of nilam essential oils:maltodextrin (1:12;1:10;1:8) produced  solid powders with sticky texture and creamy which giving a spesific aroma of nilam oils. The activity test of antifungal of  C. albicans test on liquid essential oil any diffence significantly each various of concentration of 12,5; 25; 50; and 100%. The activity of microcapsule showed that the difference specifically on various of concentrations of 1:12; 1:10 and 1:8 with the good activity power is composition of 1:12. Activity test result showed is any difference significantly between nilam oils and microcapsule.
Biodiesel Hasil Transesterifikasi Minyak Biji Nyamplung (Calophyllum inophyllum) Dengan Metanol
Authors: Musta Rustam , Haetami Aceng , Salmawati Mimi
Published: August 2024

Study of the transesterification of Calophyllum innophyllum seed oil from Kendari with methanol has been conducted. The purpose of the research to determine of the yield of ester produced in transesterification process with methanol, the viscosity of biodiesel produced, moisture content of biodiesel produced, density of biodiesel produced. The methods used in this study are sample preparation, transesterification process, biodiesel quality parameter test consisting of viscosity, moisture content and density. The results showed that good concentration of phosphoric acid was used to remove the gum is 85%, the yield of ester produced in the process of transesterification with methanol is 111,647%, parameter of biodiesel quality measured that viscosity = 0,315 mm2/ s not fulfill Indonesian National Standart (INS), water content is 0.02 meets the INS and the density = 0.8725 g / cm3 meets the INS standard
Pengaruh Perbedaan Kondisi Hidrolisis Terhadap Hasil Isolasi Nanokristalin Selulosa Dari Bonggol Jagung
Authors: Purwanti Endah , Dampang Sarah
Published: August 2024

Cellulose is one of the largest components in corncobs. Cellulose was obtained from corncob in this research that has a yield of 19.6% of 20 grams of corncob powder. The isolated cellulose was characterized by using FTIR and SEM. Cellulose has crystalline chain and insoluble in water or organic solvents. The molecular chain of cellulose is linear and has intra- and inter-molecular hydrogen bonds. One way for cellulose to be easy in the treatment of applications, is to convert microcrystalline cellulose into nanocrystalline cellulose. Nanocrystalline cellulose can be obtained by several methods, one of them by acid hydrolysis. Hydrolysis of cellulose by using sulfuric acid produces nanocrystalline cellulose. Nanocrystalline cellulose can be characterized by using TEM and PSA analysis. CNC 60 has a particle size distribution with a diameter range of 14.3 nm - 45.0 nm and an average diameter of 17.4 nm. Whereas cellulose with CNC 90 has a smaller particle size distribution with a diameter range of 10.0 nm - 17.1 nm and an average diameter of 11.9 nm.
Adsorpsi Hg(II) Menggunakan Sargassum crassifolium dengan Adanya Pb(II), Cu(II) dan Fe(II)
Authors: Nurhadini Nurhadini , Silalahi Imelda H.
Published: August 2024

Amalgamation use mercury in mining process especially small-scale gold mining and it has been impacted on mercury contamination in environment. Mercury is one of heavy metal that toxic and can accumulate in water, soil and organism. Adsorption method is one of alternative option that effective to remove heavy metal. This method depends on adsorbent type, pH, adsorbent composition with metal or presence of several metal ions. Beside mercury, wastewater of mining gold have another metal ions such as Pb(II), Cu(II) dan Fe(II) can be found by human activity or naturally present. This research aim is to study effect of Pb(II), Cu(II), and Fe(II) in Hg(II) adsorption by using Sargassum crassofolium adsorbent. Research stages are adsorbent activation and mercury adsorption on binary and ternary system respectively in equimass amount of metals ion and equimolar amounts of metals. Based on adsorption analysis is known that Pb(II) and Cu(II) is Hg(II) competitor while Fe (II) is not Hg(II) competitor in adsoption by using Sargassum crassifolium. On binary system in equimass amount of metals ion and equimolar amounts of metals that the largest decreasing effect of Hg(II) adsorption in system contain Cu(II).
Modifikasi Katalis CaO Untuk Produksi Biodiesel Dari Minyak Bekas
Authors: Gani Rachim St. Annisa , Raya Indah , Zakir Muhammad
Published: August 2024

Research about modification of CaO catalyst to produce biodiesel has done. This research aims to know the effectiveness of CaO-ZnCl2 belong to ASTM D6751 to get a yield biodiesel.  Modification of the CaO with ZnCl2 was conducted by impregnation method using methanol and n-hexane. For synthesis biodiesel, methanol is used as solvent and Waste Cooking Oil (WCO) as raw material. Ratio molar of WCO and methanol is 12:1 with 3% CaO-ZnCl2 added.  This reaction is carried out at a temperature of 65oC. the biodiesel is characterized by Fourier Transform Infrared (FT-IR) to determine the presence of ester groups formed. The yield percentage of biodiesel produced is 77.94%. The characterization of biodiesel properties consist of acid number is 73.38 mg KOH/g, density is 0.9038 and water content is 0.0053%.
Imobilisasi Asam Humat Pada Kitin Dan Aplikasinya Sebagai Adsorben Cr(III)
Authors: Sehol Muhamad , Juari Santosa Sri , Siswanta Dwi
Published: August 2024

Immobilization of humic acid on chitin has been conducted and applied to the adsorption of Cr(III). The humic acid was isolated using NaOH 0.1 M, while chitin was isolated by deproteination of crab shells by using NaOH 3.5 % (w/v) and followed by demineralization using HCl 1 M. Chitin obtained from ambient-temperature-dried crab shell is named as chitin I, and crab shell washed by HOCl solution and followed by drying at ambient temperature is named chitin II. The total acidity of the humic acid was 230.95 cmol/kg, and it was distributed into the acidity of COOH 168.75 cmol/kg, and phenolic-OH 62.20 cmol/kg. Adsorbent A with chitin I as the main material and adsorbent B with chitin II as the main material, resulted the adsorbed humic acid of 9.25 and 1.68% (w/w), respectively. Adsorption of Cr(III) was maximum at pH 5, with rate of constants orde of chitin II>adsorbent B>adsorbent A>chitin I, i.e. 0.3509; ; 0.2488; 0.1553; 0.0568 minute-1, respectively. The capacity of adsorption was in the orde of chitin I>adsorbent B>chitin II>adsorbent A, i.e. 944.77; 912.53; 895.37; 893.81 mg/g, respectively. The energy of adsorption of Cr(III)  of chitin II>chitin I>adsorbent A>adsorbent B, i.e. 22.932; 20,945; 20.312; 19.615 kJ/mol, respectively.
Kinetika Adsorpsi Zat Warna Metilen Biru Oleh Karbon Aktif Dari Kulit Kemiri (Aleurites moluccana (L) Willd)
Authors: Latupeirissa Jola , Tanasale Matheis F.J.D.P. , Musa Sigit Hardianto
Published: August 2024

The adsorption of methylene blue dye by active carbon of hazelnut shell has been done. Through acquired active carbon composing process, where is the hazelnut shell at entry into furnace on temperature 350   for 2 hour, afterwards is cooled and at sieves by sieve 100 mesh. Then by the calsination process in furnace with temperature 450   one was streamed to gas N2 four 2 hours then characterized by X-ray diffraction (XRD) for carbon before activation. The next activated with KOH solution with a concentration 0f 50  four 5 hour, then dried in an ovenat 120â„ƒ for 1 hour and thencharacterized. Weight of the solidacidity before and after activation consecutive (5.3848 x 10-3 dan 42.1554x 10-3) mol g-1. Isotherm adsorption of methylene blue dyes on active carbon  was following the Freundlich isotherm. Adsorption kinetics of methylene blue dyes on active carbon in various concentration of hazelnut shell was controlled with temperature variety at 25  and 30 . The result showed that energy activation was kJ mol-1 and a value isg mg-1 menit-1. Adsorption mechanism of methylene blue dyes on active carbon at various concentration of hazelnut shell is chemical adsorption process.
Fitoakumulasi Logam Ni dan Zn Dalam Tumbuhan Nipah (Nypa fruticans) Di Sungai Tallo Makassar
Authors: La Nafie Nursiah , Liong Syarifuddin , Arifin Rizda
Published: August 2024

Research on phytoaccumulation of Ni and Zn in Nypa fruticans plants at Tallo River has been done to know the capability of Nypa fruticans for accumulating Ni and Zn. Water, sediment, and plant tissue samples were taken at five stations on the Tallo River using a cutting tool and pipe paralon. Sediment was digested with concentrated HNO3 while plants tissue using HNO3 6M, then analyzed by ICP EOS Shimadzu 9000. The results showed the average concentration of Ni inside part of the plant from station 1, 2, 3, 4 and 5 in order following 21.759,03 ppm, 19.056,03 ppm; 36.806,25 ppm; 10.736,66 ppm dan 13.849,25 ppm. Average concentration of Zn inside the plant from station 1, 2, 3, 4 and 5 in order following 1.319,60 ppm; 1.362,93 ppm; 2.053,46 ppm; 1.591,60 ppm; dan 1.474,09 ppm. Accumulation of Zn and Ni in Nypa fruticans is grouped as hyperaccumulation plant because the ability of accumulation Ni bigger than 10.000 mg/kg and hyperaccumulation towards Zn because able to accumulate Zn bigger than 10 mg/kg. BCF and TF value show that Nypa fruticans naturally able to be used as an phytoremediation plant towards Ni and Zn, especially phytoextraction and rhizofiltration.
Validasi Metode Penentuan Mn Dalam Oli Lubrikan Dengan Metode Pengenceran Langsung Menggunakan Spektrofotometer Serapan Atom
Authors: Napitupulu Rona Maningting , Julia Dirgarini , Panggabean Aman S.
Published: August 2024

Validation method on the determination of Mn in lubricating oil by direct dilution method using Atomic Absorption Spectrophotometer (AAS) in Laboratory & Environment Control PT. Badak NGL Bontang has been done The validation method was done with research stages such as determination of  optimum solvent, and determination of some important parameters influential for validation method such as parameter of liniearitas (r), Instrument Detection Limit (IDL), Methode Detection Limit (MDL), accuracy, precision, Limit of Detection(LOD) and Limit of Quantitation(LOQ). The result of research obtain is good, showed that the linearity value with R2 â‰¥ 0,997. The IDL and MDL value was 0.0021 ppm and 0.0092 ppm respectively and has been acceptability requirements of MDL. The accuracy paramater obtained recovery value with range 82.25-88.34%. The measurement of repeatability and reproducibility, the CV Horwitz value smaller than % RSD, indicating the method had a good precision. The measurement of  LOD and LOQ value was 0.095 ppm 0.317 ppm respectively. Based on the result of the research determination method of Mn in lubricating oil by direct dilution method using AAS concluded valid.
Studi Kinetika Antibakteri dari Hasil Pirolisis Cangkang Biji Jambu Mete terhadap Staphylococcus aureus
Authors: Nurliana Laily , Musta Rustam
Published: August 2024

Research on kinetics antibacterial from pyrolysis product of cashew nut shell againts Staphylococcus aureus have been carried out. Cashew nuts are prepared by separating the shell and seeds for pyrolysis. The results of S. aureus antibacterial activity test results pyrolysis pyrolysis products shell cashew nut showed inhibition is different for each variation of the concentration of 12.5%, 25%, 50%, 75% and 100% with inhibition of successive 0.87; 0.97; 1.38; 1.47 and 1.61 (cm). Based on these results it can be said that the result of the pyrolysis of cashew nut shells provide a response inhibition that were at concentrations of 12.5 and 25%. While the concentration of 50%, 75%, and 100% response inhibitory power is included in the strong category on the growth of S. aureus. Order the reaction of the antibacterial activity of S. aureus from the pyrolysis products obtained cashew nut shell 0,3 with activity rate constant of 0.38. The concentration of pyrolysis products of pyrolysis results cashew nut shell the minimum recommended for use as an antibacterial S.aureus.
Pengaruh Penambahan Carboxymethyl Cellulose Terhadap Karakteristik Bioplastik Dari Pati Ubi Nagara (Ipomoea batatas L.)
Authors: Puryati Ningsih Erni , Ariyani Dahlena , Sunardi Sunardi
Published: August 2024

Synthesis and characterization of bioplastics from Nagara sweet potatoes (Ipomoea batatas L) starch with carboxymethyl cellulose (CMC) as a filler has been conducted. The purpose of this study was to evaluate the effects of CMC addition on the characteristic of bioplastics from Nagara sweet potato (Ipomoea batatas L) starch. Bioplastic synthesis was carried out by the melt intercalation method with variations in the amount of CMC 0-30% (w/w). Bioplastics were analyzed using FTIR spectrophotometer, thickness, solubility, water resistance, water vapor transmission rate, tensile strength and elongation. The values of the tensile strength of the bioplastic produced increases with increasing of CMC. The results also showed that the optimum CMC concentration in bioplastics production is 9% (w/w) with a tensile strength value 0.5281 N/mm2.
Studi Akumulasi Logam Berat Merkuri Menggunakan Tanaman Awar-Awar (Ficus Septica Burm F)
Authors: Mariwy Abraham , H. Dulanlebit Yeanchon , Yulianti Fian
Published: August 2024

This research aims to to study the ability of awar-awar plants ((Ficus Septica Burm. F)) to accumulate heavy metals. Awar-awar are grown in glass reactors and treated with 10 ppm mercury solution wich one, two, and three weeks in time variations. The analysis using CV-AAS showed that the total absorption of mercury heavy metals by awar-awar plants in reactors I, II and III was 81.7%, 34.6% and 85.4% respectively. When the phytoremediation process takes place the plant shows no symptoms of damage or even death even though it has accumulated more than 50% of mercury from the growing media. The BCF value of awar-awar plants in reactor I was 2.79 reactor II was 0.53 and reactor III was 0.55. While the TF values â€‹â€‹in reactors I, II and III were 0.04; 1.13 and 0.97. The calculation results of BCF and TF values â€‹â€‹show that Awar-awar plants (Ficus Septica Burm. F) can accumulate heavy metals of mercury so it is recommended to be used as a phytoremediation agent in mercury-contaminated soils.
Mekanisme Teoritis Pembentukan Senyawa Siklik Hidrokarbon dari Reaksi C4H5 dan C4H2
Authors: Indarto Antonius , Handojo Lienda
Published: August 2024

Acetylene and polyyne are intermediates in the formation of Polycyclic Aromatic Hydrocarbons (PAHs) and soot in combustion or pyrolysis. PAH formation from acetylene is known as the most adopted pathway because it has a low reaction energy. Another mechanism for the formation of PAH is a mechanism that involves polyyne or known as a radical pathway, proposed by Krestinin. This pathway involves the reaction of alkyne + alkenes which results in the addition of radical sites to the molecular structure. In this study, the two reaction mechanisms will be compared. Electronic features and energy requirements of the reaction process will be evaluated using molecular computational studies based on electron density (DFT). In combustion conditions (high temperature), the formation of radical sites requires relatively little energy, with a range of 2-5 kcal/mol. This is very different when compared to the energy profile for the same reaction at room temperature. From this study, it can be concluded that the mechanism of radical growth has the potential to occur in combustion reactions.Polycyclic aromatic hydrocarbons, radical growth, combustion, polyyne.
Bioremediation of Pb and Cd Metal from Inner Ambon Bay Sediment Which Contaminated With Heavy Metal Using Aspergillus niger
Authors: Male Yusthinus T , Seumahu Cecillia Anna , Malle Dominggus
Published: August 2024

Bioremediation is a method that use microorganism to extract heavy metal from contaminated waste. In this research Aspergillus niger was used to extract heavy metal such as Pb and Cd of marine sediment from Waiheru shore, Inner part of Ambon Bay, which was detected as significantly high heavy metal contaminated site among seven sites. Bioremediation were done using Aspergillus nigers to extract Pb and Cd metal from sediment, then their solubility being measured in filtrate media. Result shows that Cd metal were only detected 15 days after incubation while Pb were detected since the first day incubation. This result also showing the fluctuating solubility of Pb metal. It is suspected that this occurs due to biosorption ability of the fungi that being used which triggers metal accumulation in the cell structure. It is therefore can be concluded that Aspergillus niger can be used in bioremediation of sediment that are being contaminated by Pb and Cd heavy metals.
Pengaruh Tekanan Dan Tahap Kompresi Dalam Pemurnian Biogas Menjadi Biometana Dengan Absorpsi CO2 Menggunakan Air Bertekanan
Authors: Raksajati Anggit , Adhi Tri Partono , Ariono Danu
Published: August 2024

Palm oil mill effluent (POME) from condensate stew, hydrocyclone water, and sludge separator contains organic carbon with a COD more than 40 g/L and a nitrogen content of about 0.2 and 0.5 g/L as ammonia nitrogen and total nitrogen. At present, the POME is converted into biogas using anaerobic ponds. Biogas produced contains 60% methane (CH4) and 40% carbon dioxide (CO2) and can be purified into biomethane through CO2 absorption using water. This study evaluates the optimum pressure and feed compression stage in biogas upgrading into biomethane. The results show the rate of circulation of water needed to separate CO2 from biogas feed decreases with increasing absorber pressure due to increased solubility of CO2 in water. Water circulation pumps and biogas compressor works increase due to the increase in pressure difference needed. The optimum pressure of the biogas biogas purification unit is within the range of 7-10 bar. At the same absorber pressure, the 1 stage feed compression unit is cheaper than that of 2 stages. However, the overall process with 1 compression stage might not be more economical than the 2-stage if consider the higher methane loss.
Studi Adsorpsi-Desorpsi Anion Fosfat Pada Bentonit Termodifikasi CTAB
Authors: Adawiah Syarifah Rabiatul , Sutarno Sutarno , Suyanta Suyanta
Published: August 2024

Adsorption-desorption studies of phosphate on CTAB modified bentonite have been investigated. The results were characterized by FT-IR spectrometer to determine the functional groups in bentonite and X-ray diffractometer to determine the type of minerals in the bentonite. Adsorption was conducted by shaking 10 mg adsorbent in 5 mL adsorbate solution at the optimum condition of pH, contact time, and concentration. Furthermore, desorption studies were conducted on 5 mL medium of both water and citric acid 0.33 M and using 6.5 mg of adsorbent which has adsorbed phosphate. The results showed that the bentonite has been successfully modified with CTAB. The adsorption capacity of phosphate is 0.028 mmol g-1. Desorption studies showed that the solubility percentage of phosphate anion in citric acid was 0.33 M (73.33%) greater than in water (57.81%) which is a requirement for the use of slow-release fertilizers (SRF).
The Effectiveness of Magnetite Modified Gallic Acid Synthesized by Sonochemical Method As AuCl4- Adsorbent-Reductor
Authors: Rahmayanti Maya , Santosa Sri Juari , Sutarno Sutarno , Paweni Astuti
Published: August 2024

In recent years gallic acid has been developed as an AuCl4- adsorbent-reducing agent. In this research, gallic acid was modified with magnetite by sonochemical method (GA-Fe3O4), and its effectiveness as an AuCl4- adsorbent was studied. GA-Fe3O4 was synthesized through one-stage (GA-Fe3O4-SK1) and two-stage (GA-Fe3O4-SK2) methods. The effectiveness of GA-Fe3O4 was studied through optimization studies on pH, time, kinetics, and isotherm adsorption of AuCl4-. The adsorption method used was the batch method in the pH range 2-7. While the kinetics model used was the Lagergren and Ho kinetics model. The adsorption isotherm model used was the Freundlich and Langmuir isotherm model. The results showed that the optimum pH conditions for adsorption of AuCl4- on GA-Fe3O4 occurred at pH 3. Adsorption of AuCl4- on GA-Fe3O4-SK1 and GA-Fe3O4-SK2 both followed the Ho kinetic model, while the adsorption isotherm followed the Freundlich isotherm model with values KF were 0.041 and 0.034 mol/g respectively.
Pyrolysis Reaction Kinetics of Styrofoam Plastic Waste
Authors: Kauwo Feybi A. G. , Anom I Dewa K. , Lombok John Z.
Published: August 2024

Pyrolysis at the temperature range of 170 Â°C-237 Â°C against polystyrene (Styrofoam) type plastic waste is carried out without a catalyst and added a catalyst. The purpose of this research was to study the reaction kinetics of Styrofoam pyrolysis to liquid smoke products. Pyrolysis using a series of tools made of glass to observe the processes that occur in the reactor. The results showed that Styrofoam pyrolysis for liquid smoke products without catalyst and added catalyst took place in the first-order reaction. The kinetics of the pyrolysis reaction without a catalyst to observe the formation of liquid smoke products obtained by the equation of the reaction constant following the Arrhenius equation k = Ae2111.4 / T, with an activation energy value (Ea) of 17.554 x 103 kJ/mol and pyrolysis using a catalyst obtained k = Ae10330/T, with an activation energy value (Ea) of 85.883x103 kJ/mol. Using catalysts during pyrolysis will reduce the temperature so that the reaction will be slow.
Qualitative Protein Hydrolyzed from Nerita undata in Supralittoral Rocks and Mezolittoral Zone of Hasa Cape Using TLC
Authors: Kainama Healthy , Sohilait Hanoch J. , Souisa Christian Jacob
Published: August 2024

Gastropods are the sources of protein for coastal communities in the Maluku islands. We conducted analysis quantitative and qualitative of protein in Nerita undata meat from Hasa Cape in Saparua Island. The percentage of protein was analyzed by the Kjeldahl method. Qualitative analysis began with breaking peptide bonds in protein to amino acid components by sulphuric acid and barium hydroxide hydrolyzed. We identified amino acid compounds by using thin-layer chromatography (TLC) in butanol-acetic acid-water (8:1:1, v/v) as eluent. The result showed that N. undata meat contains 11.15% of protein and twelve amino acid compounds. There are seven essential amino acids in N. undata meat from supralittoral rocks and mezolittoral zone of Hasa cape is a source of quality protein. Thus, this species can be considered as a source of high-quality protein.
The Computational Calculation and Molecular Docking of Aeroplysinin-1 As Antibacterial
Authors: Maahury Mirella Fonda , Allo Veliyana Londong
Published: August 2024

Aeroplysinin-1 is naturally found from marine sponges as an anti-bacterial compound. Computational calculation and molecular docking were performed for aeroplysinin. Aeroplysinin as an inhibitor has optimized in the gas phase using DFT with 6-31G(d) functional. The structure from geometry optimization of aeroplysinin-1is, not in one plane. The interaction of aeroplysinin-1 with two different DNA gyrase from E. Coli and S. Aureus. In this research,aeroplysinin-1 can inhibit the protein with the free binding energy of about -5.7 kcal/mol and -6.35 kcal/mol, respectively, for E. Coli and S. Aureus. The dominant molecular interaction is the hydrogen bond.
Silica Content Analysis of Rice Husks Siam Unus from South Kalimantan
Authors: Mujiyanti Dwi Rasy , Ariyani Dahlena , Lisa Muna
Published: August 2024

Research on the analysis of rice husk content of Siam Unus with various NaOH concentrations (1.0 M; 1.5 M; 2.0 M; 2.5 M; 3.0 M) has been done. This study aims to obtain data on the effect of variations in NaOH concentration on the purity of the silica extract from Siam Unus rice husks and silica characterization of Siam Unus rice husks using Fourier Transform Infra-Red (FTIR) and X-ray fluorescence spectrometry (XRF). The results showed that the combustion of rice husks at 200 °C as the optimum temperature for 1 hour followed by combustion at 600 °C for 4 hours produces grayish-white rice husks with a yield is 20.70%. Silica functional group characterization showed that silanol (Si-OH) and siloxane (Si-O-Si) as dominant functional groups. The result of composition characterization using XRF showed that SiO2 is the dominant compound with the highest percentage of SiO2 is 1.5 M NaOH extract at 42.80%.