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Biodiesel production from waste cooking oil using calcium oxide derived from scallop shell waste

CLEAN ENERGY 2024年第2期8卷 113-126页

作者： Puspitasari, Poppy pramono, diki dwi Fiansyah, Davi Nur Permanasari, Avita Ayu Mufti, Nandang Abd Razak, Jeefferie Univ Negeri Malang Dept Mech & Ind Engn Malang Indonesia Univ Negeri Malang Ctr Adv Mat & Renewable Energy Malang Indonesia Univ Negeri Malang Fac Math & Nat Sci Dept Phys Malang Indonesia Univ Teknikal Malaysia Melaka Fak Kejuruteraan Pembuatan Melaka Malaysia

Biodiesel is one of the alternative forms of diesel fuel and can be obtained using the transesterification process of waste cooking oil with a catalyst to accelerate the reaction. The heterogeneous catalyst from waste scallop shells is used due to its potential for being reused in the subsequent transesterification reactions. Heterogeneous catalysts can also be recycled, contributing to their environmentally friendly nature. This study aims to identify the performance of recycling a calcium oxide (CaO) catalyst from scallop shell waste on synthesis biodiesel. The method used is the transesterification method with the basic ingredients of waste cooking oil using a CaO catalyst. Then, after the transesterification process is complete, the catalyst is separated from the biodiesel and recycled to be reused in the transesterification process up to five times. The biodiesel samples obtained are identified for yield value, physico-chemical properties, thermal properties and performance. X-ray diffraction characterization results for the CaO catalyst show that it has a crystal size of 67.83 nm. Scanning electron microscope characterization shows that it has spherical particle shapes. Fourier transform infrared characterization shows the presence of Ca-O bonds. The highest biodiesel yield value of 74.23% is obtained in biodiesel Cycle 1. The flash point value of biodiesel samples ranges from 141.2 degrees C to 149 degrees C. Further, all of the biodiesel samples exhibit a cetane number of 75. The highest lower heating value of 38.22 MJ/kg is obtained in biodiesel Cycle 1 and the viscosity of the biodiesel samples ranges from 5.65 to 5.88 cSt. The density of the biodiesel samples ranges from 881.23 to 882.92 kg/m3. Besides, ester functional groups (C=O) and methyl functional groups have been successfully formed in all samples, with the methyl oleate compound observed as dominating the biodiesel samples. The cloud point value of the biodiesel samples ranges from 12 degrees C t

关键词： biodiesel CaO catalyst waste cooking oil scallop shell DUTY DIESEL-ENGINE EMISSION CHARACTERISTICS HETEROGENEOUS CATALYST PERFORMANCE COMBUSTION NANOPARTICLES BLENDS PALM OPTIMIZATION EXTRACTION

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Characteristics of hospitalized patients with confirmed COVID-19 and their hospital management

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Asian Pacific Journal of Tropical Medicine 2024年第3期17卷 129-135页

作者： Lely Indrawati dwi Hapsari Tjandrarini Ning Sulistiyowati Tin Afifah Astridya Paramita Felly Philipus Senewe Pandji Wibawa Dhewantara National Research and Innovation Agency Republic of Indonesia CibinongBogorWest Java 16911Indonesia

Objective:To determine the risk factors of mortality among hospitalized COVID-19 ***:This retrospective study used hospitalization records collected by the Indonesia Health Social Security Administrator Agency(Badan Penyelenggara Jaminan Sosial Kesehatan-BPJS Kesehatan).A total of 38277 eligible patients with confirmed COVID-19 were *** dependent variable of the study was the discharge status(death or recovery)of *** variables were history of morbidity and disease-related occurrence,type of room health facilities,length of stay and demographic variables(sex,age).The analyses use bivariate and multivariate logistic regression to determine the dominating variable associated with all these ***:Of the 38277 inpatients with PCR-confirmed COVID-19,31051(81.1%)were discharged and 7226(18.9%)*** of death was positively associated with older age(aOR 5.74,95%CI 4.20-7.87 for 19-64 years old;aOR 13.75,95%CI 9.99-18.92 for 65 years above),male sex(aOR 1.13,95%CI 1.07-1.19),treated in ICU without ventilator(aOR 5.84,95%CI 5.41-6.30)and had comorbid respiratory diseases(aOR 5.39,95%CI 4.93-5.90),but negatively associated with hospital stay of 15 days or longer(aOR 0.39,95%CI 0.36-0.43).Conclusions:COVID-19 related death during hospitalization was associated with duration and type of treatment,and existing medical condition among the inpatient individuals during COVID-19 pandemic in DKI *** findings of the study suggest importance of appropriate and timely medical intervention and care.

关键词： Inpatients COVID-19 Death Risk of factors Indonesia

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Family counseling of dental and oral care for preventing caries of dental during preschool age: a literature review

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Nursing Communications 2024年第9期8卷 1-7页

作者： Amalia-dwi Wardani Tantut Susanto Latifa-Aini Susumaningrum Undergraduate Nursing Program Faculty of NursingJember UniversityJember 68121Indonesia Department of Community Family&Gerontic NursingFaculty of NursingJember UniversityJember 68121Indonesia

Incorrect family behavior in caring for the dental and oral health of preschool-aged children can affect the incidence of dental caries in these children and can cause more serious health problems in the future if not treated immediately,so it is important to find the right *** study aims to determine the effect of family counseling on dental and oral care for *** study uses a narrative literature review *** articles using 5 databases(Pubmed,ScienceDirect,SpringerLink,ProQuest,and Google Scholar)to search for articles with the keywords family counseling AND Oral health AND Early Childhood Caries AND Behavior Change AND Family and the article selection process refers to the Flow diagram of the PRISMA Statement *** results showed that there were 7 articles analyzed in this *** implementation of family counseling has a significant effect in increasing self-efficacy,knowledge,ability,and motivation of the family,as well as the behavior of the child,to reduce the risk of dental caries in preschool-age children,taking into account several *** was determined that family counseling is effective in reducing the incidence of dental caries in preschool children.

关键词： dental caries family counseling oral health care preschool children

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Optimization of methane conversion to liquid fuels over W-Cu/ZSM-5 catalysts by response surface methodology

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Journal of Natural Gas Chemistry 2008年第1期17卷 39-44页

作者： Didi dwi Anggoro Istadi Chemical Reaction Engineering and Catalysis Group Department of Chemical EngineeringUniversity of DiponegoroTembalangSemarang 50239Indonesia

The conversion of methane to liquid fuels is still in the development process. The modified HZSM-5 by loading with Tungsten （W） enhanced its heat resistant performance, and the high reaction temperature （800℃） did not lead to the loss of W component by sublimation. The loading of ZSM-5 with Tungsten and Copper （Cu） resulted in an increment in the methane conversion, CO2, and C5＋ selectivities. The high methane conversion and C5＋ selectivity, and low H2O selectivity are obtained by using W/3.0Cu/ZSM-5. The optimization of methane conversion over 3.0 W/3.0Cu/ZSM-5 under different temperature and oxygen concentration using response surface methodology （RSM） are studied. The optimum point for methane conversion is 19% when temperature is 753 ℃, and oxygen concentration is 12%. The highest C5＋ selectivity is 27% when temperature is 751 ℃. and oxwen concentration is 11%.

关键词： methane W-Cu/ZSM-5 liquid hydrocarbons response surface methodology

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Reusable high performance of calcined Mg/Al hydrotalcite for the removal of Navy Blue and Yellow F3G dyes

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Chinese Journal of Chemical Engineering 2021年第10期34卷 247-254页

作者： Sri Juari Santosa dwi Puji Astuti Department of Chemistry Faculty of Mathematics and Natural SciencesUniversitas Gadjah MadaBulaksumurYogyakarta 55281Indonesia

Water pollution with dye chemicals from apparel industries is a serious problem in the *** most of dyes are potentially have toxic and carcinogenic effects on human,it is important to remove them before they are discharged to the *** many methods available for dyes removal in water,adsorption is the easiest and economically feasible that has no major obstacle for practical *** the present study,we tested calcined Mg/Al hydrotalcite(Mg/Al CHT)prepared by coprecipitation technique as an adsorbent for the removal of Navy Blue(NB)and Yellow F3G(YF3G)***/Al CHT was characterized by using a Fourier transform infrared(FTIR)spectrometer,an X-ray diffractometer(XRD)and a scanning electron microscope(SEM).The results showed that Mg/Al CHT was highly effective as an adsorbent for the removal of NB and YF3G under mild-acidic condition(pH 4)with removal capacities(b)according to Langmuir isotherm model were 7.97×10^(–4) and 5.80×10^(–4)mol·g^(-1),*** study showed that the adsorption of NB and YF3D on Mg/Al CHT followed pseudosecond order with rate constant(k_(p2))11.57×10^(3) and 11.75×103 g·mol^(-1)·min-1,*** spent adsorbent can be easily regenerated by simply calcining it at 450℃ for 3 *** test on the mixture of NB and YF3G showed that the adsorption capacity of Mg/Al CHT was eightfold higher than that of Mg/Al HT and the value was maintained with repeated use.

关键词： Adsorption Mg/Al hydrotalcite Navy Blue Yellow F3G Wastewater treatment

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The potential of miRNA-based therapeutics in severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) infection: A review

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Journal of Pharmaceutical Analysis 2021年第3期11卷 265-271页

作者： Leonny dwi Rizkita Indwiani Astuti Department of Pharmacology and Therapy Faculty of MedicinePublic Health and NursingUniversitas Gadjah MadaYogyakarta55281Indonesia

Since the World Health Organization(WHO) declared COVID-19, the disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2), as a pandemic in March 2020, and more than 117 million people worldwide have been confirmed to have been infected. Scientists, medical professionals,and other stakeholders are racing against time to find and develop effective medicines for ***, no drug with high efficacy to treat SARS-CoV-2 infection has been approved. With the increasing popularity of gene therapy, scientists have explored the utilization of small RNAs such as microRNAs(miRNAs) as therapeutics. miRNAs are non-coding RNAs with high affinity for the 30-UTRs of targeted messenger RNAs(mRNAs). Interactions between host cells and viral genomes may induce the upregulation or downregulation of various miRNAs. Therefore, understanding the expression patterns of these miRNAs and their functions will provide insights into potential miRNA-based therapies. This review systematically summarizes the potential targets of miRNA-based therapies for SARS-CoV-2 infection and examines the viability of possible transfection methods.

关键词： microRNA SARS-CoV-2 COVID-19 Targeted therapy

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Resource allocation strategies for survival and reproduction by an invasive pest in response to intermittent fasting

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Current Zoology 2023年第5期69卷 600-606页

作者： dwi RISTYADI Xiong ZHE Qiao WANG School of Agriculture and Environment Massey UniversityPrivate Bag 11222Palmerston NorthNew Zealand Agriculture Faculty Jambi UniversityKm 15 Mendalo Darat 36361JambiIndonesia

Intermittent fasting(IF)is a type of dietary restriction that involves fasting periods in intervals,which has been used as a strategy to improve health and extend *** fasting is common during the process of biological invasions in ***,it is not clear how invasive animals adjust their resource allocations to survival and reproduction when periodical starvation ***,we used Tetranychus ludeni,a haplodiploid spider mite and an important invasive pest of horticultural crops around the world,to investigate the effects of IF on its life history *** show that IF increased the longevity in females but not in males probably because of differences in resource storage,metabolic rate,and mating cost between *** response to IF,females traded off fecundity and egg size but not the number of daughters for longevity gain,suggesting that *** females can adjust their life history strategies for population survival and growth during invasion *** produced by fasted females realized the same hatch rate and resultant young had the same survival rate as those by unfasted *** addition,IF had transgenerational maternal effects which prolonged offspring development *** suggest that the longer immature developmental period can increase the body size of resulting adults,compensating egg size loss for offspring *** findings provide insight into resource allocations as responses to fasting,knowledge of which can be used for evaluation of pest invasions and for management of animal survival and reproduction by dietary regulations.

关键词： acari fasting longevity offspring performance reproduction tetranychidae

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OsSCE1 Encoding SUMO E2-Conjugating Enzyme Involves in Drought Stress Response of Oryza sativa

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Rice science 2018年第2期25卷 73-81页

作者： Dini NURDIANI dwi WIDYAJAYANTIE Satya NUGROHO Laboratory of Genomics and Crop Improvement Research Center for Biotechnology Indonesian Institute of Sciences

Small ubiquitin-like modifier(SUMO)-conjugating enzymes are involved in post-translational regulatory processes in eukaryotes, including the conjugation of SUMO peptides to protein substrate(SUMOylation). SUMOylation plays an important role in improving plant tolerance to abiotic stress such as salt, drought, heat and cold. Herein, we reported the isolation of OsSCE1(LOC_Os10 g39120) gene encoding a SUMO-conjugating enzyme from rice(Oryza sativa cv. Nipponbare) and its functional validation in response to drought stress. The E2 enzyme, Os SCE1, is one of three key enzymes involved in the conjugation of SUMO to its target proteins. Activated SUMO is transferred to the cysteine of an E2 enzyme and then to the target lysine residue of the substrate, with or without the help of an E3 SUMO ligase. Expression of OsSCE1 was strongly induced by polyethylene glycol 6000(PEG6000) treatment, which suggested OsSCE1 may be involved in the drought stress response. Overexpression of OsSCE1(OsSCE1-OX) in Nipponbare reduced the tolerance to drought stress. Conversely, the drought tolerance was slightly improved by the knockdown of OsSCE1(OsSCE1-KD). These results were further supported by measurement of proline content in OsSCE1-OX and OsSCE1-KD transgenic lines under induced drought stress, which showed OsSCE1-KD transgenic lines accumulated higher proline content than the wild type, whereas OsSCE1-OX line had lower proline content than the wild type. These findings suggested OsSCE1 may play a role as a negative regulator in response to drought stress in rice.

关键词： Oryza sativa drought stress small ubiquitin-like modifier SUMO-conjugating enzyme proline content gene expression

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Pharmacological aspects of fisetin

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Asian Pacific Journal of Tropical Biomedicine 2021年第1期11卷 1-9页

作者： Lucia dwi Antika Rita Marleta Dewi Research Center for Chemistry Indonesian Institute of SciencesBantenIndonesia Center for Research and Development for Biomedical and Basic Health Technology National Institute of Health Research and DevelopmentMinistry of HealthIndonesia

Over the past decades,epidemiological studies have concluded that a diet rich in plant-derived products plays a pivotal role in human ***(3,3’,4’,7-tetrahydroxyflavone)is a hydrophobic polyphenolic compound primarily found in edible plants(***,blueberry,apple,grape,persimmon,kiwi,and cucumber).Various preclinical studies have revealed that fisetin exhibits a wide range of pharmacological effects such as antioxidant,antiinflammatory,anti-carcinogenic,anti-osteoporotic,antimicrobial,and anti-diabetic ***,the pharmacological in vitro and in vivo studies on fisetin are discussed in this ***,this review would be useful for further study regarding the potential of natural products,notably fisetin,and its therapeutic potential for the prevention and treatment of diseases.

关键词： Fisetin Anti-inflammatory Anti-diabetic Anti-carcinogenic Anti-osteoporosis Cardioprotective activity

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Methane to Liquid Hydrocarbons over Tungsten-ZSM-5 and Tungsten Loaded Cu/ZSM-5 Catalysts

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Journal of Natural Gas Chemistry 2006年第4期15卷 340-347页

作者： Didi dwi Anggoro Nor Aishah Saidina Amin Department of Chemical Engineering University of Diponegoro TembalangSemarang 50239Indonesia Faculty of Chemical and Natural Resources Engineering Universiti Teknologi MalaysiaJohor Bahru 81130Malaysia

Metal containing ZSM-5 can produce higher hydrocarbons in methane oxidation. Many researchers have studied the applicability of HZSM-5 and modify ZSM-5 for methane conversion to liquid hydrocarbons, but their research results still lead to low conversion, low selectivity and low heat resistance. The modified HZSM-5, by loading with tungsten （W）, could enhance its heat resistant performance, and the high reaction temperature （800 ℃） did not lead to a loss of the W component by sublimation. The loading of HZSM-5 with tungsten and copper （Cu） resulted in an increment in the methane conversion as well as CO2 and C5＋ selectivities. In contrast, CO, C2-3 and H2O selectivities were reduced. The process of converting methane to liquid hydrocarbons （C5＋） was dependent on the metal surface area and the acidity of the zeolite. High methane conversion and C5＋ selectivity, and low H20 selectivity are obtained over W/3.0Cu/HZSM.

关键词： methane liquid hydrocarbons HZSM-5 W-ZSM-5 W-Cu/ZSM-5

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