Journal Cover Sainteknol : Jurnal Sains dan Teknologi
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  This is an Open Access Journal Open Access journal
   ISSN (Online) 2527-3604
   Published by Universitas Negeri Semarang Homepage  [74 journals]
  • CHACARTERIZATION OF LOCAL DURIAN GERMPLASM BASED ON THE MORPHOLOGY OF
           FRUIT

    • Authors: Amin Retnoningsih, Enni Suwarsi Rahayu, Ika Puspita Sari
      Pages: 89 - 94
      Abstract: One of the efforts to improve the quality and the conservation of local fruits like durian requires characteristic certainty of durian fruits according to the needs of plant breeders and tastes of consumers. Some durian germplasm at Hortimart Agro Center in Central Java have been successfully characterized. There are 43 accessions with 18 characters covering 64 character states of fruit. The dendrogram showed that those 43 accessions split into 2 groups. Durian Kartomarmo separated from the other 42 accessions. Durian Kartosumarmo has a unique characteristic on its fruit, which has an apex with irregular shape (mammiform). Some durians which have good taste, such as durian Bismo, Cokro, Janoko, and Petruk were grouped together with durian Monthong. The coeffient similarity in 43 accessions of the durian fruit is between 0.44-0.86. The diversity of accessions based on the fruit morphology showed that these 43 accessions were different and not a duplicate of different accessions. It shows that each of accession should be categorized as a different cultivar since there are many other characteristics that have not been observed.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8989
      Issue No: Vol. 14, No. 2 (2017)
       
  • PHYLOGENETIC RELATIONSHIPS OF LOCAL DURIAN SPECIES BASED ON MORPHOLOGICAL
           CHARACTERISTICS AND PCR-RFLP ANALYSIS OF THE RIBOSOMAL INTERNAL
           TRANSCRIBED SPACER (ITS) DNA

    • Authors: Fidia Fibriana, Lutfia Nur Hadiyanti
      Pages: 95 - 106
      Abstract: In this study, twentydurian species obtained from Central Java in situ collection were characterized using the morphological characteristics and the restriction patterns which generatedfrom the region spanning the internal transcribed spacers ITS LEU and ITS 4. Morphological characteristics of durian leaf, stem, tree, and fruit showed a variation for the differentspecies, whereas polymerasechain reaction (PCR) products of ribosomal DNA region showed a low length of variation. The size of the PCR products and the restrictionanalyses with the restriction endonucleases Bsp1431yielded a restriction pattern for eachspecies.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8990
      Issue No: Vol. 14, No. 2 (2017)
       
  • PERFORMANCE OF PHOTOCATALYST BASED CARBON NANODOTS FROM WASTE FRYING OIL
           IN WATER PURIFICATION

    • Authors: Mahardika Prasetya Aji, Pradita Ajeng Wiguna, Susanto Susanto, Nita Rosita, Siti Aisyah, Suciningtyas Suciningtyas, Sulhadi Sulhadi
      Pages: 107 - 114
      Abstract: Carbon Nanodots (C-Dots) from waste frying oil could be used as a photocatalyst in water purification with solar light irradiation. Performance of C-Dots as a photocatalyst was tested in the process of water purification with  a given synthetic sewage methylene blue. The tested was also conducted by comparing the performance C-Dots made from frying oil, waste fryng oil as a photocatalyst and solution of methylene blue without photocatalyst C-Dots. Performance of C-Dots from waste frying oil were estimated by the results of absorbance spectrum. The results of measurement absorbance spectrum from the process of water purification with photocatalyst C-Dots showed that the highest intensity at a wavelength 664 nm of methylene blue decreased. The test results showed that the performance of photocatalyst C- Dots from waste frying oil was better in water purification. This estimated that number of particles C-dots is more in waste frying oil because have experieced repeated the heating process so that the higher particles concentration make the photocatalyst process more effective. The observation of the performance C-Dots from waste frying oil as a photocatalyst in the water purification processes become important invention for solving the problems of waste and water purification.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8992
      Issue No: Vol. 14, No. 2 (2017)
       
  • EFFECT OF TIME AND TEMPERATURE ON ISOMERIZATION REACTION OF Α-PINENEUSING
           CATALYST ZR 4+ Nanik Wijayati, Supartono, Nuni Widiarti, Tri Handayani
           /NATURAL ZEOLITE

    • Authors: Nanik Wijayati, Supartono Supartono, Nuni Widiarti, Tri Handayani
      Pages: 115 - 124
      Abstract: Effects of time and temperature on α-pinene isomerization reaction using catalysts Zr/natural zeolitewas studied. Characterization of the catalysts include: crystallinity, observed using X-Ray Diffraction, count Zr 4+ carried observed using X-Ray Fluorescence, area and porosity catalyst was observed using the Surface Area Analyzer, and acidity catalyst observed through gravimetric method. Isomerization reaction carried out in a batch reactor with temperature variations 90, 120 and 150 C and reaction time variations of 60, 90, 120, 150 and 180 minutes. Best results of isomerisation in this study was obtained at 150 derajat C with a reaction time of 180 minutes. Kindsof isomer obtained was observed using GCMS. Catalyst characterization results indicate that modification of the catalyst by cation Zr increases the acidity from 2.76 to 6.64 mmol/g and does not damage the crystal structure significantly. The highest product conversion in this research is 9.24%, less than the maximum results caused by pre-treatment of the catalyst produces a low area. Thus, temperature and reaction time affect the concentration of α pinene isomerization product in addition to the effect of the catalyst used.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8993
      Issue No: Vol. 14, No. 2 (2017)
       
  • PHYSICAL CHARACTERISTICS AND MAGNETIC PROPERTIES OF BAFE12O19/SRTIO3 BASED
           COMPOSITES DERIVED FROM MECHANICAL ALLOYING

    • Authors: Rahmat Doni Widodo, Azwar Manaf
      Pages: 125 - 132
      Abstract: Barium hexaferrite and strontium titanate are well established permanent magnet and piezoelectric materials which are technologically and scientifically attractive due to their potential for various applications in the field of magnetic electronics functional materials. However, the material properties for both require a careful control of grain structure as well as microstructure design to meet a specific application. In this work, we report some results of materials characterization especially particles and grains which were promoted during mechanical milling of a BaFe12O19/SrTiO3 composite system. These are including mean particle size characterization by Particle Size Analyzer and mean grain size determination by means of line broadenning analysis employing a step scanning counting in XRD apparatus for composite powders at various milling time up to 60 hours. It was found that the particle size of composite powders initially increased due to laminated layers formation of a composite and then decreased to an asymptotic value of ~8 μm as the milling time extended even to a relatively longer time. However, based on results of line broadening analysis the mean grain size of the particles was found in the nanometer scale. We thus believed that mechanical blending and milling of mixture components for the composite materials has promoted heterogeneous nucleation and only after successive sintering at 1100 oC the milled powder transformed into particles of nanograin. In thireport, microstructure as well as magnetic properties for the composite is also briefly discussed.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8994
      Issue No: Vol. 14, No. 2 (2017)
       
  • PEMBUATAN TRIGGER GAMELAN DENGAN MEMANFAATKAN MIKRO KONTROLER ARDUINO NANO
           AT328

    • Authors: Slamet Haryono, Wadiyo Wadiyo
      Pages: 133 - 138
      Abstract: Ditemukannya Gatul (Gamelan Tutul) oleh Dosen di ITS (Institut Teknologi Surabaya dan E-Gamelan di Udinus (Universitas Dian Nuswantoro) serta hasil penelitian di Unnes berjudul “Aplikasi Teknologi Sampling dalam Pembuatan Soundfont Suara Gamelan sebagai Media Pembelajaran Seni Musik SMP di Kota Semarang” membuka peluang untuk diciptakan Triger Gamelan yang dapat digunakan sebagai media pembelajaran musik. Permasalahan utama yang diajukan dalam penelitian ini adalah bagaimanakah pembuatan prototip triger gamelan dengan memanfaatkan Mikro kontroler Arduino nano AT328' Oleh karena itu tujuan penelitian ini bertujuan untuk mengembangkan prototip triger gamelan dengan memanfaatkan Mikro kontroler Arduino nano AT328 yang dapat digunakan sebagai media pembelajaran musik di SD. Metode yang digunakan adalah metode penelitian dan pengembangan atau Research and Development (R&D) yang diadopsi dari Borg and Gall (1989:784) dengan sepuluh langkah penelitian. Produk luaran yang dihasilkan adalah prototip triger gamelan, dan panduan penggunaannya.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8995
      Issue No: Vol. 14, No. 2 (2017)
       
  • DEVELOPMENT OF CHEMSITRY TEACHER PROFESSIONALISM THROUGH PEDAGOGICAL
           CONTENT KNOWLEDGE TRAINING

    • Authors: Sri Haryani, Sri Wardani, Agung Tri Prasetya
      Pages: 139 - 150
      Abstract: This study aims to analyze the impact of Pedagogical Content Knowledge (PCK) training to the development of chemistry teachers’ professionalism through MGMP. The study involved 5 chemistry teachers who measured the PCK capability through filling CoRe (Content Representation) and writing PaPeRs (Pedagogical and Professional-experience Repertoires), which represents the PCK of a teacher as proposed by Loughran. Quantitative data drawn from the results of the fillingCoRe,Lesson Plan (RPP), and PaP-eRs instruments, whereas qualitative data were taken from the three linkage analysis supported by the results of the interview. Based on the results of data analysis revealed that PCK training can develop the teachers professionalism as measured by the PCK capability especially in minimizing the weaknesses that have been prevalent as how to express apperception, the depth of the material, determine the learning strategies, and pay attention to the prerequisites material.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8996
      Issue No: Vol. 14, No. 2 (2017)
       
  • ANTIMICROBIAL ACTIVITY OF METHANOL EXTRACT FROM MAHOGANY SEEDS Sri
           Mursiti, Supartono (SWIETENIA MACROPHYLLA, KING)

    • Authors: Sri Mursiti, Supartono Supartono
      Pages: 159 - 166
      Abstract: Mahogany seeds is one of the natural ingredients that can be used as an antimicrobial. This study aims to determine the antimicrobial activity of methanol extract mahogany seeds and determine the components of active compounds that have antimicrobial activity against Escherichia coli (E.coli) and Bacillus cereus (B.cereus). Extraction was done by maceration method with methanol and testing of antimicrobial activity using the absorption method. The results showed that the antimicrobial activity of methanol extract mahogany seeds shows inhibitory activity and provide clear zone against bacteria E.coli with value Inhibitory Regional Diameter 16,75 mm respectively, but did not give a clear zone of the bacterium B.cereus. Based on the results of the study it can be concluded that the methanol extract of seeds mahogany has antimicrobial activity against E.coli.
      PubDate: 2017-03-02
      DOI: 10.15294/sainteknol.v14i2.8991
      Issue No: Vol. 14, No. 2 (2017)
       
  • POLA AKUMULASI LOGAM CU IKAN BANDENGSELAMA PERIODE PERTUMBUHAN DI TAMBAK

    • Authors: Sri Mulyani ES, Nana Kariada Tri Martuti, Andin Irsadi
      Pages: 151 - 158
      Abstract: Akibat kerusakan pantai dan lahan mangrove di kawasan pesisir pantai Kota Semarang menyebabkan menurunnya kualitas lingkungan wilayah pesisir. Penurunan kualitas lingkungan ini berpengaruh pada lingkungan tambak yang berada di wilayah pesisir pantai yang juga akan mempengaruhi kualitas ikan yang dipelihara di tambak-tambak di wilayah pesisir pantai. Ikan Bandeng merupakan salah satu hasil budidaya ikan di tambak yang banyak terdapat di daerah pantai atau pesisir. Sampel dalam penelitian ini berupa:logam Cu pada air, sedimen serta ikan bandeng pada tambak penelitian yang sudah ditentukan. Kualitas lingkungan yang terdiri dari: DO, pH, salinitas dan suhu perairan. Penelitian ini menggunakan pendekatan ekologi (ecological approach).Data bioakumulasi logam Cu dalam sedimen, air dan ikan bandeng dianalisis berdasarkan rumus FK dan BCF yang ada.Dari penelitian yang telah dilakukan, diperoleh hasil kandungan logam Cu pada peraiarn tambak antara 0,2-0,3 ppm dan sedimen antara 18,088-22,81 ppm. Kadar logam dalam air tersebut sudah berada di atas ambang batas yang telah ditentukan Pemerintah berdasarkan Keputusan Menteri Lingkungan Hidup No 51 Tahun 2004 tentang Baku Mutu Air Laut, kadar Cu untuk biota laut 0,008 mg/L. Untuk itu perlu mendapat perhatian adanya pencemaran logam Cu di tambak bandeng wilayah Tapak. Kandungan logam Cu pada ikan di wilayah Tapak (1.165 - 3.396 ppm ) masih di bawah ambang batas yang diijinkan BPOM No. 03725/B/SK/VII/89Tahun 1989 sebesar 20 ppm, tetapi harus tetap diwaspadai mengingat sifatnya yang akumulatif dan membahayakan kesehatan manusia yang mengkomsumsinya.
      PubDate: 2016-12-01
      DOI: 10.15294/sainteknol.v14i2.8997
      Issue No: Vol. 14, No. 2 (2016)
       
  • CHEMICALLY MODIFIED KAPOK SAWDUST FOR ADSORPSTION OF METHYL VIOLET DYE
           FROM 1 Widi Astuti, Triastuti Sulistyaningsih AQUEOUS SOLUTION

    • Authors: Widi Astuti, Triastuti Sulistyaningsih
      Pages: 167 - 178
      Abstract: The potential of chemically modified Kapok sawdust for methyl violet adsorption was investigated in a batch adsorption process. Various physicochemical parameters such as pH, contact time and initial dye concentration were studied. The adsorbent was characterized with Fourier transform infrared spectrophotometer, scanning electron microscope and Brunauer, Emmett and  Teller (BET) analysis. The optimum conditions for methyl violet adsorption were pH 5 and contact time 30 min. Langmuir, Freundlich and Redlich-Peterson isotherm model were used to analyze the equilibrium data. The experimental data fitted well with the Redlich-Peterson model, with the value of constants are 41.001 L g -1 for K R , 0.523 L 0.799 mg -0.799 for a and 0.799 for β
      PubDate: 2016-12-01
      DOI: 10.15294/sainteknol.v14i2.9001
      Issue No: Vol. 14, No. 2 (2016)
       
 
 
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