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The Biodiversity of Flora and Fauna in the Re-vegetation Area in The post-Mining Area of Pongkor

IOP Conference Series: Earth and Environmental science 2020年第1期501卷

作者： A Kusumoarto A Gunawan Machfud A Hikmat Doctoral Student Program Natural Resource and Environmental Management Science School of Post-Graduate IPB University Jl. Raya Pajajaran Bogor Indonesia 16143 Lecturer in Architecture Study Program Faculty of Technic and Computer Science Indraprasta PGRI University Jl. Raya Nangka No. 58C RT.5/RW.5 Tanjung Barat Kecamatan Jagakarsa Kota Jakarta Selatan Daerah Khusus Ibukota Jakarta 12530 Lecturer in Landscape Architecture Department IPB University Jl. Raya Darmaga Bogor Indonesia 16680 Lecturer in AgroIndustrial Technology Department IPB University Jl.Raya Darmaga Bogor Indonesia 16680 Lecturer in Conservation of Forest and Ecotourism Department IPB University Jl. Raya Darmaga Bogor Indonesia 16680

The Pongkor post-mining area is designated as one of the ecotourism areas in Bogor. This area has biodiversity of flora and fauna. This study aims to: (1) analysis the importance value index (IVI) of flora types; (2) analysis species richness index, species diversity index, and relative species abundance index; (3) analysis the beauty, the uniqueness and the rarity of the flora and fauna types. The method used in this research is quantitative descriptive. Based on the identification results, 185 species of flora are distributed in this region. During the rainy season, 15 species of herpetofauna were identified, 32 types of aves, and 4 types of mammals, while in the dry season 19 species of herpetofauna were identified, 23 types of aves, and 2 types of mammals. Based on the results of the analysis conducted on these flora and fauna, there are flora species that have high IVI values and some beautiful and unique flora species that are in the category of endangered species. Besides that, there are also fauna species which have a value of species richness index, species diversity index, and relative species abundance index, as well as some beautiful, unique, and fauna species that are in the category of endangered species.

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Pyrolysis: An effective technique for degradation of COVID-19 medical wastes

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Chemosphere 2021年 275卷 130092页

作者： Selvakumar Dharmaraj Veeramuthu Ashokkumar Rajesh Pandiyan Heli Siti Halimatul Munawaroh Kit Wayne Chew Wei-Hsin Chen Chawalit Ngamcharussrivichai (Deemed to be University) Chennai 603112 Tamil Nadu India. Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC) Faculty of Science Chulalongkorn University Bangkok 10330 Thailand. Electronic address: rvashok2008@***. Department of Biochemistry Karpagam Academy of Higher Education (formerly Karpagam University) Pollachi Main Road Eachanari Post Coimbatore Tamil Nadu India. Chemistry Study Program Department of Chemistry Education Faculty of Mathematics and Science Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi 229 Bandung 40154 Indonesia. School of Energy and Chemical Engineering Xiamen University Malaysia Jalan Sunsuria Bandar Sunsuria 43900 Sepang Selangor Malaysia College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 Fujian China. Department of Aeronautics and Astronautics National Cheng Kung University Tainan 701 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung 407 Taiwan Department of Mechanical Engineering National Chin-Yi University of Technology Taichung 411 Taiwan. Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC) Faculty of Science Chulalongkorn University Bangkok 10330 Thailand Center of Excellence on Petrochemical and Materials Technology (PETROMAT) Chulalongkorn University Pathumwan Bangkok 10330 Thailand. Electronic address: Chawalit.Ng@chula.ac.th.

COVID-19 has led to the enormous rise of medical wastes throughout the world, and these have mainly been generated from hospitals, clinics, and other healthcare establishments. This creates an additional challenge in medical waste management, particularly in developing countries. Improper managing of medical waste may have serious public health issues and a significant impact on the environment. There are currently three disinfection technologies, namely incineration, chemical and physical processes, that are available to treat COVID-19 medical waste (CMW). This study focuses on thermochemical process, particularly pyrolysis process to treat the medical waste. Pyrolysis is a process that utilizes the thermal instability of organic components in medical waste to convert them into valuable products. Besides, the technique is environmentally friendly, more efficient and cost-effective, requires less landfill capacity, and causes lower pollution. The current pandemic situation generates a large amount of plastic medical wastes, which mainly consists of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, and nylon. These plastic wastes can be converted into valuable energy products like oil, gas and char through pyrolysis process. This review provides detailed information about CMW handling, treatment, valuable product generation, and proper discharge into the open environment.

关键词： COVID-19 medical waste Disinfection techniques Energy conversion Medical waste management Pyrolysis

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[email protected] nanocomposite modified electrode for sensitive and simultaneous detection of Cd (II) and Pb (II)

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Synthetic Metals 2018年 245卷 251-259页

作者： Jutiporn Yukird Pongsakorn Kongsittikul Jiaqian Qin Orawon Chailapakul Nadnudda Rodthongkum Nanoscience and Technology Interdisciplinary Program Graduate School Chulalongkorn University Phayathai Road Patumwan Bangkok 10330 Thailand Petrochemical and Polymer Science Faculty of Science Chulalongkorn UniversityPhayathai Road Pathumwan Bangkok 10330 Thailand Metallurgy and Materials Science Research Institute Chulalongkorn University Soi Chula 12 Phayathai Road Pathumwan Bangkok 10330 Thailand Electrochemistry and Optical Spectroscopy Research Unit Department of Chemistry Faculty of Science Chulalongkorn University Phayathai Road Pathumwan Bangkok 10330 Thailand Nanotec-CU Center of Excellent on Food and Agriculture Chulalongkorn University Phayathai Road Patumwan Bangkok 10330 Thailand

Zinc Oxide (ZnO) nanorods were synthesized by using zinc acetate as a precursor via thermal decomposition method and then used to prepare [email protected] nanocomposite by facile room-temperature approach using a colloidal coagulation effect. The as prepared [email protected] nanocomposite was applied to modify the working electrode surface in an electrochemical sensor of Cd 2+ and Pb 2+ for the first time. The morphologies of ZnO and [email protected] nanocomposite were characterized by transmission electron microscopy, that exhibits the nanorod shape with an average diameter of 89 ± 18 nm, uniformly dispersed and intercalated between each G layer. Furthermore, the important factors affecting on the sensor sensitivity, including [email protected] ratio, [email protected] concentration, Bi 3+ concentration and electrochemical parameters were systematically investigated using square-wave anodic stripping voltammetry. Under the optimal conditions, a linear range was found to be 10–200 μg L −1 and the detection limits were 0.6 and 0.8 μg L -1 for Cd 2+ and Pb 2+ , respectively. Eventually, it was successfully used for the simultaneous detection of Cd 2+ and Pb 2+ in real wastewater samples and the results corresponded well with a standard inductively coupled plasma-optical emission spectroscopy.

关键词： Zinc oxide nanorod Graphene Nanocomposite Electrochemical sensor Cadmium Lead

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Chemical profile, toxicity, anti-acetylcholinesterase and antimicrobial activity of essential oil from hyptis dilatata leaves

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Chemical Engineering Transactions 2018年 64卷 271-276页

作者： Almeida, Sirley P. de Filho, Antonio Alves M. Simplicio, Fernanda Guilhom Martins, Regildo M. G. Takahashi, Jacqueline A. Ferraz, Vany P. de Melo, Ana Cristina G. R. Tadei, Wanderli P. Post graduate in Biodiversity and Biotechnology Program PPG BIONORTE State Coordination of Amazonas ManausAmazonas Brazil Postgraduate Program in Chemistry PPGQ Center for Research and Graduate Studies in Science and Technology NPPGCT Departament of Chemistry and Postgraduate in Biotechnology and Biodiversity Program Rede Bionorte Federal University of Roraima Paricarana Campus Boa Vista-RRCEP 69304-000 Brazil Laboratory of Phytochemistry and Semi synthesis Faculty of Pharmaceutical Sciences Federal University of Amazonas Manaus AmazonasCEP 69077-000 Brazil Federal University of Pernambuco Immuno Pathology Laboratory Keizo-Ami Recife-PE Brazil Department of Chemistry Institute of Exact Sciences Universidade Federal de Minas Gerais CEP 31270-901 Belo HorizonteMinas Gerais Brazil Chromatography Laboratory Institute of Exact Sciences Federal University of Minas Gerais CEP 31270-901 Belo HorizonteMinas Gerais Brazil Post graduate in Natural Resources Program Federal University of Roraima Boa Vista-RR Brazil National Institute for Amazonian Research Manaus AmazonasCEP 69067-375 Brazil

ISBN: (纸本)9788895608563

The aim of this study was to evaluate the influence of seasonality on the chemical composition of the essential oil from Hyptis dilatata leaves, to perform biological activity assays such as antimicrobial, inhibition of acetylcholinesterase enzyme and to evaluate the toxicity of the essential oil using Artemia salina as indicator on the test. Hyptis dilatata leaves were collected in rainy and dry seasons, in the morning, in the afternoon and in the evening. It was extracted by hydrodistillation using the extractor of Clevenger condenser double Spell model. The essential oil analysis resulted in 22 chemical components. The major constituents of the dry and rainy periods were a-pinene (18.7% in the night and 12.9% in the afternoon), 3-carene (26.5% and 19.9% in the night), fenchone (43% and 33.7% in the morning) and ß-caryophyllene 9.1% in the afternoon and 6.1% in the morning. The essential oil in vitro inhibited the acetylcholinesterase enzyme in 99.9% in the afternoon (rainy period) and 96.4% in the morning (dry period). Between the dry and rainy seasons, the lowest LC50 microbial activity in vitro was obtained for leaves collected during rainy season, in the morning period tested against the bacterium Staphylococcus aureus (LC50 78.1 mg mL-1). The cytotoxic activity of the essential oil of H. dilatata on Artemia salina showed LC50 results below 100 µg mL-1 and in the afternoon during the rainy period and at night in the dry period the results are above this value. Therefore, the chemical characterization and biological activities tests of essential oils showed promising results in the search for new active substances and the development of bioproducts of vegetable origin. Copyright © 2018, AIDIC Servizi S.r.l.

关键词： Essential oils

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Effects of drying time on essential oil production of kaffir lime (Citrus hystrix DC) leaves at ambient temperature

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IOP Conference Series: materials science and Engineering 2019年第1期633卷

作者： Y W Wulandari C Anwar S Supriyadi Post Graduate School of Food Science Doctor Program Gadjah Mada University (UGM) Jl. Folra no.1 Bulaksumur Yogyakarta 552812 Central Java Indonesia Department of Agricultural Products Technology Faculty of Industrial and Food Technology Slamet Riyadi University Surakarta 57136 Central Java Indonesia Department of Chemistry Faculty of Mathematics and Natural Science Gadjah Mada University Yogyakarta Indonesia Department of Food and Agricultural Products Technology Faculty of Agricultural Technology Gadjah Mada University Jl. Flora no.1 Bulaksumur Yogyakarta 552812 Indonesia

Drying was one of the primary processes in essential oil production. Time factor in drying affects both the content and chemical compositions of essential oils. This study aims to evaluate the influence of the drying time of kaffir lime leaves on the yield at room temperature and the major volatile compounds in the essential oils by observing day-to-day treatments. As a key odorants in essential oils, the quantity of citronellal was determined by Gas Chromatography (GC) using the standard compound. Based on the daily observation results, a long-time drying gave a significant effect on the yield and the major volatile compounds. The highest yield 1.26±0.07 % (w/w) was obtained on the fourth day, while the highest content of citronellal compounds, 87.58±0.33% was achieved on the fifth day of drying,. A prolonged drying time resulted in a negative effect on not only the quantity, but also the quality of essential oils. Accordingly, this study suggests that the drying technique at room temperature best lasts for four until five days to obtain the most favorable quality and quantity of essential oils.

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Physical Characteristics of Modified Cassava Flour Wastewater at Room Temperature

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IOP Conference Series: Earth and Environmental science 2019年第1期292卷

作者： N Yaqin A N Al-Baarri A M Legowo Widayat M A Budihardjo Program of Environmental Science School of Post Graduate Studies Diponegoro University Semarang Indonesia Center of Research and Services-Diponegoro University Semarang Indonesia Food Technology Department Faculty of Animal and Agricultural Sciences Diponegoro University Semarang Indonesia Chemical Engineering Department Faculty of Engineering Diponegoro University Semarang Indonesia Department of Environmental Engineering Faculty of Engineering Diponegoro University Indonesia

Cassava is an agricultural material that is considered as important raw resources in the industrial sector. The benefits are even greater after being modified using lactic acid bacteria. However, the mocaf industry often causes water and air pollution. Environmental problems arise after the fermentation process. Determination problems with lightness, TDS (Total Dissolved Solid), conductivity and pH analysis are required to measure the impact to the environment. This research was used waste water from mocaf during 3 days fermentation. The wastewater had the highest color level (Lightness) on initial day of fermentation at 83.7±3.73 and then decrease along the day of fermentation at the averages of 65.2±2.0. The highest TDS was resulted from the mocaf wastewater at a value of 1218 ± 4.6 ppm which continued to decline until day 4. The conductivity and pH showed a decrease along the day of fermentation. As conclusion, physical characteristic of wastewater from mocaf production could be analyzed specifically and determined through color, TDS, conductivity, and pH.

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Synthesis and characterization of mullite-zirconia prepared through solid sintering of 3Al2O3-2SiO2 xerogel and ZrO2 xerogel as a dental implant material

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AIP Conference Proceedings 2020年第1期2219卷

作者： Yanwar Faza Arief Cahyanto Nina Djustiana I Made Joni 1Graduate School of Biomedical Science Master Program Faculty of Medicine Universitas Padjadjaran Jl. Prof Eyckman No. 38 Bandung Indonesia 2Department of Dental Materials Science and Technology Faculty of Dentistry Universitas Padjadjaran Jl. Raya-Bandung Sumedang KM 21 Jatinangor West Java 45363 Indonesia 3Department of Physics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor West Java 45363 Indonesia 4Nanotechnology and Graphene Research Center Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor West Java 45363 Indonesia

Mullite-zirconia is a ceramic material that has mechanical properties values that are close with the jaw bone. Lately, various precursor characteristics were used to produce the mullite-zirconia as the starting material. However, the processing requires a higher temperature to achieve crystallization and densification of mullite-zirconia. In this study, mullite-zirconia was synthesized through solid sintering of 3Al2O3−2SiO2 xerogel and ZrO2 xerogel. Those xerogels were produced by the sol-gel method and characterized by particle size analyzer and scanning electron microscope. Subsequently, those xerogel were categorized into five batch composition (AlSi, Zr, 85AlSi/15Zr, 80AlSi/20Zr and 75AlSi/25Zr). These samples were then sintered at 1300 °C for 2 hours and characterized by X-ray diffraction. The result shows the acquired particle size of 3Al2O3−2SiO2 xerogel and ZrO2 xerogel are 355.7 nm and 414.3 nm respectively. The morphology of these samples are irregular, however, for ZrO2 xerogel, it has angular morphology in some particles. The XRD exposed AlSi turn into 100% mullite. Meanwhile, Zr produces 22% tetragonal zirconia and 78 % monoclinic zirconia. For 85AlSi/15Zr, it contains mullite and monoclinic zirconia with fraction amounts are 74.4 % and 25.6 % respectively. Subsequently, 80AlSi/20Zr shows the lower fraction amount of mullite crystallinity (71.5 %) along with increasing the amount of monoclinic zirconia (28.5%). Lastly, 75AlSi/25Zr shows the crystallinity of sillimanite, tridymite and monoclinic zirconia with the fraction amount are 57.3 %, 12.1%, 30.6 % respectively. We conclude the reduction in the number of zirconia is able to maintain the mullite crystal, however, along with the increase in zirconia, it inhibits the formation of the mullite structure due to Zr atom act as an inhibitor in substitution of Al with Si atom to form the mullite crystalline.

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Ambient-pressure CVD of graphene on low-index Ni surfaces using methane: A combined experimental and first-principles study

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Physical Review materials 2018年第7期2卷 073404-073404页

作者： Daniela L. Mafra Jimena A. Olmos-Asar Fabio R. Negreiros Alfonso Reina Ki Kang Kim Mildred S. Dresselhaus Jing Kong Gary J. Mankey Paulo T. Araujo Department of Electrical Engineering and Computer Sciences Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Centro de Ciências Naturais e Humanas Universidade Federal do ABC Santo André 09210-580 SP Brazil INFIQC CONICET Departamento de Química Teórcia y Computacional Facultad de Ciencias Químicas Universidad Nacional de Córdoba X5000HUA Argentina Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Energy and Materials Engineering Dongguk University-Seoul Seoul 04620 Republic of Korea Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Physics and Astronomy The University of Alabama Tuscaloosa Alabama 35487 USA Center for Materials for Information Technology (MINT Center) The University of Alabama Tuscaloosa Alabama 35401 USA Natural Sciences Institute Graduate Program in Physics - Federal University of Para Belem PA 66075-110 Brazil

The growth of large area single-layer graphene (1-LG) is studied using ambient pressure chemical vapor deposition on single-crystal Ni(111), Ni(110), and Ni(100). By varying both the furnace temperature in the range of 800–1100 °C and the gas flow through the growth chamber, uniform, high-quality 1-LG is obtained for Ni(111) and Ni(110) single crystals and for Ni(100) thin films. Surprisingly, only multilayer graphene growth could be obtained for single-crystal Ni(100). The experimental results are analyzed to determine the optimum combination of temperature and gas flow. Characterization with optical microscopy, Raman spectroscopy, and optical transmission support our findings. Density-functional theory calculations are performed to determine the energy barriers for diffusion, segregation, and adsorption, and model the kinetic pathways for formation of different carbon structures on the low-index surfaces of Ni.

关键词： Growth Synthesis 2-dimensional systems Carbon-based materials Atomic force microscopy Chemical vapor deposition Density functional calculations Density functional theory Raman spectroscopy

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Combined effects of nonparaxiality, optical activity, and walk-off on rogue wave propagation in optical fibers filled with chiral materials

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Physical Review E 2018年第4期97卷 042205-042205页

作者： D. D. Estelle Temgoua M. B. Tchoula Tchokonte T. C. Kofane Laboratory of Mechanics Materials and Structures Post Graduate School in Sciences Technology and Geosciences Doctoral Research Unit in Physics and Applications University of Yaounde I P.O. Box 812 Yaounde Cameroon Organization for Women in Science for the Developing World ICTP Campus Strada Costiera 11 34151 Trieste Italy Department of Physics and Astronomy University of the Western Cape Private Bag X17 Bellville 7535 South Africa Centre d'Excellence Africain en Technologies de l'Information et de la Communication University of Yaounde I P.O. Box 812 Yaounde Cameroon

The generalized nonparaxial nonlinear Schrödinger (NLS) equation in optical fibers filled with chiral materials is reduced to the higher-order integrable Hirota equation. Based on the modified Darboux transformation method, the nonparaxial chiral optical rogue waves are constructed from the scalar model with modulated coefficients. We show that the parameters of nonparaxiality, third-order dispersion, and differential gain or loss term are the main keys to control the amplitude, linear, and nonlinear effects in the model. Moreover, the influence of nonparaxiality, optical activity, and walk-off effect are also evidenced under the defocusing and focusing regimes of the vector nonparaxial NLS equations with constant and modulated coefficients. Through an algorithm scheme of wider applicability on nonparaxial beam propagation methods, the most influential effect and the simultaneous controllability of combined effects are underlined, showing their properties and their potential applications in optical fibers and in a variety of complex dynamical systems.

关键词： Continuum mechanics

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Effect of long-term exposure to aluminum and high-fat diet on NTPDase and 5′-nucleotidase activities in lymphocytes and platelets of rats

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Environmental Quality Management 2017年第1期27卷 67-73页

作者： Kaizer, Rosilene Rodrigues Costa, Eduarda de Andrade, Cínthia Melazzo Schmatz, Roberta Gutierres, Jessié Martins Martins, Danieli Brolo Morsch, Vera Maria Schetinger, Maria Rosa Chitolina Federal Institute of Science and Technology of Rio Grande do Sul–IFRS Campus Sertão Sertão Rio Grande do Sul Brazil Post-Graduate Program in Environmental Science and Technology Federal University of the Southern Border Brazil Post-Graduate Program in Biological Sciences: Toxicological Biochemisty CCNE Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil

Aluminum is one of the most abundant metals in the earth's crust. Although it shows no known biological function, it is recognized as an adjuvant in vaccines for human and veterinary uses. This study aims to evaluate the role of lifestyle and environment in the promotion of chronic disease. In it, we associated two factors: chronic exposure to aluminum and high-fat diets. Thus, we aimed to determine whether the association of long-term exposure to aluminum and high-fat diets affects the NTPDase and 5′-nucleotidase activities in the blood platelets and lymphocytes obtained from the mesenteric lymph nodes of young rats. In fact, the ectonucleotidase activities were shown to be upregulated upon exposure to aluminum plus high-fat diets. As a result, we can suggest that the progressive upregulation of ectonucleotidase activities that we observed could be controlling the extent of inflammation and immune response. © 2017 Wiley Periodicals, Inc.

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