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Makara Journal of Science
Published by Universitas Indonesia
ISSN : 23391995     EISSN : 23560851     DOI : https://doi.org/10.7454/mss
Core Subject :
Makara Journal of Science publishes original research or theoretical papers, notes, and minireviews on new knowledge and research or research applications on current issues in basic sciences, namely: Material Sciences (including: physics, biology, and chemistry); Biochemistry, Genetics, and Molecular Biology (including: microbiology, physiology, ecology, taxonomy and evolution); and Biotechnology.
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Articles 880 Documents
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SPEKTROSKOPI INFRAMERAH SENYAWA KALSIUM FOSFAT HASIL PRESIPITASI Soejoko, Djarwani S.; Wahyuni, Sri
Makara Journal of Science Vol. 6, No. 3
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Infrared Spectroscopy of Precipitated Calcium Phosphate Compound. Samples of calcium phosphate compounds were produced from saturated solutions containing of calcium and phosphate ions. The experiments were carried out using solutions at temperature 25 º C and 70 º C, combined with different pH value of 5, 7, 9 and 11. Precipitation mass from solutions at 70 º C was relatively higher compare to that produced from solutions at 25 º C. It was also shown that generally the mass precipitation rose with the increasing of pH. Sample analyses were performed with the use of infrared spectroscopy, particularly for the samples produced from solutions at 70 º C. Based on the ν4 phosphate absorption band, it was indicated that apatite crystals found in most samples which its amount gave rise to the increasing of pH. Infrared spectroscopy of the heated samples produced with pH 11 showed that water molecules could be present either at the surface of crystals or trapped in the crystal structure.
REFLECTION INFLUENCE ON OUTPUT FREQUENCY SPECTRUM AT SUBMILLIMETER FREQUENCY TUNABLE GYROTRONS Aripin, Aripin; Kurniawan, B.
Makara Journal of Science Vol. 6, No. 3
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Influence of output window reflections on oscillatory processes in gyrotrons has been studied. The processes in a gyrotron have been modeled numerically, and enhancement of the spectrum signal in the presence of reflections has been studied. Dependencies of output power versus time and frequency spectrum for different value of reflection coefficient are given. Possibilities of significant increasing of output spectrum are demonstrated experimentally. The results demonstrate significant influence of reflections on operation stability and composition of the output radiation of the gyrotron.
THE SYNTHESES OF [BzMe3N]2[Mo4O10(OMe)6] Bakri, Ridla
Makara Journal of Science Vol. 6, No. 3
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In an attempt to synthesize [BzMe3N]2Mo2O5(OMe)5 from the reaction of [BzMe3N]2MoO4 and MoO(OMe)4 in the ratio of 1:1 in methanol has produced [BzMe3N]2Mo4O10(OMe)6. The formation of [Mo4O10(OMe)6]2- anion suggests that ligand dissociation has occured in solution. Suitable crystals for X-ray chrystallographic were obtained from hot methanol and the crystal structure of [BzMe3N]2Mo4O10(OMe)6 has been solved and reported here in.
UJI PENDAHULUAN EFEK KOMBINASI ANTIJAMUR INFUS DAUN SIRIH (Piper betle L.), KULIT BUAH DELIMA (Punica granatum L.), DAN RIMPANG KUNYIT (Curcuma domestica Val.) TERHADAP JAMUR CANDIDA ALBICANS Soemiati, Atiek; Elya, Berna
Makara Journal of Science Vol. 6, No. 3
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The investigation for antifungal effect of medicinal plants, combination infusion of Piper bettle leaves, Punica granatum Fructus Cortec, Curcuma domestica Rhizome. The tested demartophyta used Candida albicans. This research using dilution method to determine of minimum inhibitory concentration (MIC) and difusion method to determine zone inhibition around of disc. The results of determination of MIC showed that combination infusion Piper bettle leaves with Punica granatum Fructus Cortex against C. albicans respectively, 31,2 mg/ml : 7,8 mg/ml; 15,6 mg/ml : 15,6 mg/ml and 7,8 mg/ml : 31,2 mg/ml. The determination for zone inhibition from 3 concentration of infusion of Piper bettle leaves with 3 concentration of Punica granatum Fructus Cortex with 9 combination against C. albicans showed that combination of two infusion is the larger than the single infusion.
Two New Records of Wild Bananas (Musa balbisiana and Musa itinerans) from Sulawesi Sulistyaningsih, Lulut Dwi; Megia, Rita; Widjaja, Elizabeth Anita
Makara Journal of Science Vol. 8, No. 1
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The diversity of wild banana species in Sulawesi was investigated based on the morphological characteristics of herbarium specimens collected in Sulawesi and deposited in the Herbarium Bogoriense, Bogor, Indonesia (BO). New specimens were collected from Central, North, South, and Southeast Sulawesi, and digital type specimens were also used in this study. The aim of this study was to describe the diversity of wild banana species in Sulawesi as most Musaceae specimens stored at BO have not been identified. By examinating 110 sheets of herbarium specimens, five species of Musa, including two infraspecific taxa of M. acuminata housed in Sulawesi, were identified. Musa acuminata, M. celebica, and M. textilis were previously reported from Sulawesi. However, M. balbisiana and M. itinerans are two new records of wild banana species in Sulawesi. Identification keys, descriptions, distribution maps, and line-drawing illustrations of these two species are provided.
Morphological and Molecular Analysis and Flowering Time of T2 Generation Transgenic Rice cv. Nipponbare Carrying CONSTANS (CO) Gene Irshanty, Firdha Meidi; Salamah, Andi; Santoso, Tri Joko
Makara Journal of Science Vol. 8, No. 1
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Flowering is an important process that initiates plant productivity. Rice (Oryza sativa cv. Nipponbare) was genetically engineered by introducing a CONSTANS (CO) gene from Arabidopsis thaliana (AtCO) to improve rice productivity. The CO gene is a gene responsible for inducing early flowering. The aims of the experiment were to use morphological and molecular analysis to study the integration of the AtCO gene and its influence on agronomic traits in the T2 generation of Nipponbare transgenic AtCO rice. Morphological observations showed that agronomic traits tended to be better in the transgenic plants than in the wild type (controls), although the transgenic plants flowered later than the wild type. Polymerase Chain Reaction (PCR) analysis showed that 169 out of 227 transgenic rice plants showed hpt and CO gene integration.
Synthesis of Tris(4-Methoxyphenyl)Phenylsilane Using Phenylsilane and 4-Iodo Anisole Catalyzed by Palladium Complex Lesbani, Aldes; Mohadi, Risfidian; Eliza, Eliza; Mardiyanto, Mardiyanto
Makara Journal of Science Vol. 8, No. 1
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Sintesis Tris(4-Metoksifenil)Fenilsilan Menggunakan Fenilsilan dan 4-Iodida Anisol dengan Katalis Senyawa Kompleks Paladium. Sintesis tris(4-metoksifenil)fenilsilan melalui reaksi kopling antara fenilsilan dan 4-iodida anisol menggunakan senyawa paladium tersier tributilfosfin sebagai katalis telah dilakukan berdasarkan penentuan senyawa basa, pelarut, dan waktu reaksi kopling. Hasil penelitian menunjukkan bahwa senyawa tris(4-metoksifenil)fenilsilan dapat disintesis menghasilkan persentase produk maksimum pada penggunaan senyawa 1,4-diazabisiko[2,2,2]oktan (DABCO) sebagai basa, tetrahidrofuran sebagai pelarut, dan waktu reaksi kopling selama 5 hari. Persentase tertinggi produk senyawa tris(4-metoksifenil)fenilsilan adalah 35%.
Effectiveness of Powder and Solid Ragi Starter on Production of Bioethanol from Rice Straw Hydrolyzate Ediviani, Wanda; Octavia, Silvi; Yasman, Yasman
Makara Journal of Science Vol. 8, No. 1
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Rice straw is one of the most abundant forms of agricultural wastes in Indonesia. Rice straw contains polysaccharide in the form of cellulose and hemicellulose, which can be used as raw materials in the production of bioethanol. This study aims to examine the effectiveness of bioethanol production from rice straw’s hydrolyzate. Research was carried out by fermenting the sample using two types of starters (Baker's yeast, known as powder starter (F); and Tapai’s starter, known as solid starter (S) with a control of pure yeast, Saccharomyces cerevisiae. Glucose levels were measured using a glucometer, and bioethanol levels were analyzed using high-performance liquid chromatography (HPLC). In this study, split plot design was used as a data analyzer with two treatment factors: starter’s inoculum (R) and time of fermentation (T). This study shows that there is no significant difference between the starters’ levels of bioethanol production. However, S’s treatment produced higher levels (5,1 g/L) of bioethanol compared to F’s (4,8 g/L); the rate of bioethanol production in S’s treatment is also higher (1,3 g/L.h) than that in F’s (1,2 g/L.h). This study concludes that Tapai’s starter is more effective in producing bioethanol from rice straw’s hydrolyzate.
Construction and Characterization of Conductometric Biosensor for Determination of the Diazinon Concentration Prayoga, Indrajid; Mulyasuryani, Ani; Prasetyawan, Sasangka
Makara Journal of Science Vol. 8, No. 1
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Excessive diazinon residue in vegetables can endanger human health. Therefore, a simple, fast, and accurate method is needed to detect residue. A conductometric biosensor is a good choice because it also offers high selectivity and sensitivity. The principle of detection of the conductometric biosensor is based on enzymatic hydrolysis of diazinon into O,O diethyl phosphorothiate,2-isopropyl-6-methylpyrimidin-4-ol, and H+ catalyzed by organophosphate hydrolase (OPH). The optimum amount of organophosphate hydrolase added to the screen-printed carbon electrode (SPCE) modified with BSA-glutaraldehyde is 118.5 µg, while the optimum pH is 8.5. This biosensor has a response time of 30 sec, a linear dynamic range of 0 to 1 ppm, sensitivity of 42.21 µS/ppm, and limit of detection of 0.19 ppm.
X-ray Diffraction Phase Analyses of Mullite Derived from Rice Husk Silica Sembiring, Simon; Simanjuntak, Wasinton
Makara Journal of Science Vol. 16, No. 2
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X-ray Diffraction Phase Analyses of Mullite Derived from Rice Husk Silica

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