1,721,179 research outputs found
Elektrokimia dalam analisis farmasi dan deteksi obat
No full textBuku Kimia berjudul Elektrokimia Dalam Analisis Farmasi Dan Deteksi Obat merupakan karya Rahadian Zainul. Elektrokimia adalah ilmu yang mempelajari hubungan antara listrik dimana potensial yang diterapkan dan arus keluaran dicatat secara terus menerus. Secara umum elektrokimia terbagi atas dua, yaitu sel galvanis dan sel elektrolisis. Reaksi elektrokimia berlangsung secara interkonversi energi kimia menjadi energi listrik (dan sebaliknya) melalui reaksi redoks yang terjadi di antara elektrode dalam larutan elektrolit. Dalam buku kimia ini dibahas secara terperinci prinsip-prinsip dasar elektrokimia dan mengilustrasikannya melalui studi kasus yang menarik, memberikan pembaca pemahaman mendalam tentang bagaimana teknologi ini memainkan peran penting dalam industri farmasi dan keamanan obat. Dengan bahasa yang jelas dan pendekatan yang sistematis, buku ini tidak hanya menjadi panduan esensial bagi ilmuwan dan peneliti bidang kimia dan farmasi, tetapi juga membuka pintu bagi pembaca awam yang ingin memahami konsep elektrokimia dengan lebih baik
Blended Learning MKDK di LPTK Suatu Pendekatan Riset Konsorsium dan Aplikatif Bagian 1
No full textBuku ini merupakan hasil riset konsorsium dari Lembaga Perguruan Tinggi Kependidikan (LPTK) dalam penugasan riset untuk mengembangkan model blended Learning MKDK. Mata Kuliah Dasar Kependidikan (MKDK) merupakan mata kuliah utama sebagai bekal bagi setiap calon tenaga kependidikan, khususnya guru. Pengembangan Blended Learning ini bertujuan untuk menjembatani perubahan global dunia di Era Revolusi Industri (ERI) 4.0 atau era digital. Kendati keterbatasan tempat dan waktu, dengan menggunakan teknologi digital pembelajaran, semua keterbatasan akan berubah menjadi peluang dan masa depan. Dari hasil riset ini telah dihasilkan sebuah model pembelajaran dan elearning MKDK untuk mata kuliah Profesi Kependidikan, Belajar Pembelajaran, Perkembangan Peserta Didik dan Landasan Pendidikan. Elearning ini merupakan pengembangan dan kolaborasi dari 5 perguruan tinggi LPTK yakni Universitas Negeri Padang (host), Universitas Negeri Medan, Universitas Negeri Jakarta, Universitas Negeri Malang dan Universitas Negeri Surabaya.
Tim peneliti yang mengembangkan merupakan bagian dari konsorsium yang ditugaskan Kementrian Pendidikan dan Kebudayaan dan Kementrian Ristekbrin, yang dulunya di Kementrian Ristekdikti. Penugasan ini dalam bentuk Konsorsium Riset Unggulan Perguruan Tinggi (KRUPT), tahun 2019-2022. Mereka adalah Dr. Rahadian Zainul, S.Pd., M.Si, dan Muhammad Adri, S.Pd., M.Pd.T. (Universitas Negeri Padang), Drs. Sriadhi, S.Pd., M.Pd., M.Kom., Ph.D. (Universitas Negeri Medan), Dr. KHaeruddin, M.Pd., (Universitas Negeri Jakarta)., Neni Wahyuningtyas, S.Pd., M.Pd. (Universitas Negeri Malang) dan Prof. Dr. Drani, M.Hum (Universitas Negeri Surabaya)
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
EFFECT OF TEMPERATURE AND PARTICLE MOTION AGAINST THE ABILITY OF ZnO SEMICONDUCTOR PHOTOCATALYST IN HUMIC ACID
No full textIt has been studied to determine the effect of temperature and particles motion of zinc oxide semiconductor from commercial ZnO powder on phototransformation of humic acid, using B & L 20 Spectronics. This study was done under some optimum conditions: lighting time of 2 hours, using Hg lamp of low pressure ( λ = 254 nm), humic acid of 100 ppm and pH=9.2. it was disclosed that 97.51 % of humic acid transformed into minerals product. This research can contributed to solve the environmental problems in peat water
ISOLATION AND IDENTIFICATION OF FRESHWATER MICROALGAE POTENTIALLY AS ANTIBACTERIAL FROM TALAGO BIRU KOTO BARU WEST SUMATERA
No full textMicroalgae have potential as antibacterial compounds, the content of microalgae which has the activity of amino acids, terpenoids, florotanins, steroids, phenolics, acrylic acids and halogenated ketones can be used as an antimicrobial. In this research, screening and isolation of microalgae which can be used as antibacterial has been done at Talago Biru, Koto Baru, West Sumatera and the content of secondary metabolites were identified. The isolation was done by using agar plate and serial dilution methods. Isolates were identified morphological and molecular, it is known as a type of Chlorella sp. Best harvest time was determined by Spectrophotometric method at 450 nm is obtained in day 20 on the stationary phase. Based on phytochemical test, this isolate positively contain phenolics, saponins, steroids and triterpenoids, then the antibacterial activity of microalgae extracted with methanol was tested. It is known that the isolates has potential as an antibacterial, were seen from the test results provided by the zone of inhibition against four isolates of bacteria test with extract concentrations of 10 mg / mL, 100 mg / mL and 500 mg / mL respectively E .Coli 8 mm, 10 mm and 12 mm, Salmonella bacteria typhii 10.5 mm, 9 mm, 9 mm, Staphylococcus aureus 9 mm, 10 mm and 10 mm as well as the bacteria Bacillus cereus 10 mm, 10.5 mm, and 11 mm with a comparator amoxycillin as a positive control and 0.1% DMSO as a negative control. Keywords: Talago Biru, Chlorella sp., secondary metabolite, antibacteria
ISOLATION AND IDENTIFICATION OF FRESHWATER MICROALGAE POTENTIALLY AS ANTIBACTERIAL FROM TALAGO BIRU KOTO BARU WEST SUMATERA
No full textMicroalgae have potential as antibacterial compounds, the content of microalgae which has the activity of amino acids, terpenoids, florotanins, steroids, phenolics, acrylic acids and halogenated ketones can be used as an antimicrobial. In this research, screening and isolation of microalgae which can be used as antibacterial has been done at Talago Biru, Koto Baru, West Sumatera and the content of secondary metabolites were identified. The isolation was done by using agar plate and serial dilution methods. Isolates were identified morphological and molecular, it is known as a type of Chlorella sp. Best harvest time was determined by Spectrophotometric method at 450 nm is obtained in day 20 on the stationary phase. Based on phytochemical test, this isolate positively contain phenolics, saponins, steroids and triterpenoids, then the antibacterial activity of microalgae extracted with methanol was tested. It is known that the isolates has potential as an antibacterial, were seen from the test results provided by the zone of inhibition against four isolates of bacteria test with extract concentrations of 10 mg / mL, 100 mg / mL and 500 mg / mL respectively E .Coli 8 mm, 10 mm and 12 mm, Salmonella bacteria typhii 10.5 mm, 9 mm, 9 mm, Staphylococcus aureus 9 mm, 10 mm and 10 mm as well as the bacteria Bacillus cereus 10 mm, 10.5 mm, and 11 mm with a comparator amoxycillin as a positive control and 0.1% DMSO as a negative control
CHARACTERIZATION OF NAPA SOIL AND ADSORPTION OF PB (II) FROM AQUEOUS SOLUTIONS USING ON COLUMN METHOD
No full textThis research aim to investigate and characterization Napa soil at West Sumatera, Indonesia. Napa soil is one of the biggest mineral soil in sumatera island, especially at West Sumatera. Napa soil was characterized using XRD, XRF and morphology SEM. The biggest composition in Napa soil is zeolite that can be used as adsorbant, for removal of Pb (II) from aqueous solutions by column method. The evaluated parameters were optimum pH, initial concentration, particle size and flow rate. The optimum condition was at pH=4, that is 11.146 mg/g, concentration begin optimum 250 mg/L be obtained the as big as adsorption capasity 9.195 mg/g, adsorbent heating that optimum be got to heating temperature 125oC with adsorption capacity is 9,480 mg/g, the particle size that optimum be obtained to size 830-350 µm with adsorption capacity is 11.323 g/g whereas the optimum flow rate 20 drop/minute with adsorption capasity that is 11.21 mg/g. To use it equalization adsorption Langmuir to get the maximum adsorption capacity is 24.39 mg/g. This study revealed that Napa soil is a very good adsorbent to remove Pb (II) from waste water as the substitutes of more expensive synthetic material. Keywords : Characterization, Adsorption, Napa soil, Pb(II), Zeoli
DISAIN, METODE DAN PENGGUNAAN SOFTWARE PEMBELAJARAN KIMIA BERBASIS IT UNTUK AKTIVITAS KELAS DAN LABORATORIUM BERBASIS INKUIRI TERBIMBING
No full textThis Article is a review of educational design and method of studying in Chemistry for Senior High School, for twenty years, since 1990 era to 2016 update. This study aim to investigate of scientific method for chemistry concepts for developing perceptions and imagery by guide inqury with “key questions”. The difference of inquiry method in teaching of chemistry, the simplest phase was only shown by activities in class rooms by interaction with teacher, its means askanswer, and see the picture, not at all. After all, by Internet Technology (IT) and developing software technology, we try to developing of integrated method and design (software) to make combinations between both of them. One of simplest software in instructional chemistry are Chem Office 2008, thus for IT software of Phet, from University of Colorado, USA. We reported that we already developed some software for educational chemistry based on android, multimedia (macromedia Flash MX), Macromedia Flash, and the others based on WEB applications. All of this designs and method was developing by Research Teams of Chemistry Dept., Padang State University. They are Teams of Mawardi et al (Guide/Inquiry Method), Minda Azhar et al (Designing and Developing of inquiry instructional chemistry), Hardeli et al (Android and applications of instructional chemistry for smartphone), Budhi Oktavia et al (Chemistry in Web and Blog), and Rahadian Z et al (Software for educational and computation Chemistry)
DESIGN AND MODIFICATION OF COPPER OXIDE ELECTRODES FOR IMPROVING CONVERSION COEFFICIENT INDOORS LIGHTS (PV-CELL) PHOTOCELLS
No full textThis research aims to investigate photocells reactor design can convert indoor lights energy into electrical energy. Indoor lights comes from sunlight entering into the room and fluorescent light irradiation. Design of photocells reactor use a panel of copper oxide (Cu2O/CuO) of calcined Cu plate and filler electrolyte Na2SO4 0.5 N. Modification of electrode by n-p junction layer, which one of section (n) and the others section (p). Photocells reactor was constructed by thickness of the glass pane, the distance between the electrodes, the interface layer, layer and coating reflector panels. In this research there are three design of photocells reactor, The first design is R1, the thickness of the glass panel 3 mm thick reactor 15 mm without anti reflector. In this design, there are two type based on the difference at the junction of type n, (R1a = plate Cu; R1b = plate Aluminum) generate 182.82 mW/m2 and 21119644.3 NW/m2. Than, the second design of photocells reactor is R2a (junction-type n = plate Cu) and R2b (junction-type n = plate Al), a panel thickness of 15 mm and has a layer anti reflector provide power 214.95 mW/m2 and 24163298.3 NW/m2. The last design of photocells reactor is R3 (R3a = Cu) and R3b (Al), thickness of 9 mm, the distance between the electrodes 0.30 mm, using anti reflector carbon, giving each the power of 277.36 mW/m2 and 31258420.91 NW/m2. The most optimum reactor design is R3b with 2:14% conversion capabilities (Intensity = 90.21 foot candles) for indoor lights. Keywords : Photocells, Reactor, Indoor Lights, Design, Copper Oxid
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