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Ivandini Tribidasari A.
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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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PENGEMBANGAN SISTEM PENCIUMAN ELEKTRONIK DENGAN 16 BUAH SENSOR KUARSA DAN ALGORITMA NEURAL PROPAGASI BALIK UNTUK PENGENALAN AROMA CAMPURAN Kusumoputro, Benyamin; Jatmiko, Wisnu
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

An artificial odor recognition system is developed for discriminating odors. This artificial system consisted of 16 quartz resonator crystals as the sensor array, a frequency modulator and a frequency counter for each sensor that are connected directly to a microcomputer. We have already shown that the artificial odor recognition system with 4 sensors is high enough to discriminate simple odor correctly, however, when it was used to discriminate compound odors, the recognition capability of this system is dropped significantly to be about 40%. Results of experiments show that the developed artificial system with 16 sensors could discriminate compound aroma based on 6 gradient of alcohol concentrations with high recognition rate of 89.9% for non batch processing system, and 82.4% for batch processing of the classes of odors
PERBAIKAN GEOMETRIK TRASE JARINGAN JALAN DENGAN MENGGUNAKAN TEKNOLOGI PENGINDERAAN JAUH DAN SISTEM INFORMASI GEOGRAFIS Sukojo, Bangun Muljo; Kustarto, Hendro
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

Geometric Improvement Of Trace Network Road with Remote Sensing and Geographic Information System. Together with a great development in road network at such district, it must be followed by changing information that should be suited to the condition at present. For supporting the information changes, the remote sensing technology could be applied. It is one of technology with a great increment and needed to various applications. The application of remote sensing technology is close related to spatial field which is used to be achieved from non digital because of limitation facilities and other obstacle. However with remote sensing technology, those can not be burdened anymore and the information achieved can be updated. The presence of remote sensing technology is followed by emerging of Geographic Information System technology which promises a new era in providing deep information and spatial object analysis. The object identification through Landsat Thematic Mapper (LTM) image with (30x30) meter spatial and 7 (seven) band spectral resolution. The composite image together with image contrast improvement are applied to supervised classification covered object for obtaining classified and corrected image that can be used to analyze network road improvement and create database information of trace network road using Geographic Information system.
POLA PERSEBARAN INDUSTRI DI KORIDOR JALAN RAYA BOGOR Tambunan, Mangapul P.
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

Spatial dispersed pattern of Industry at Jalan Raya Bogor Corridor. The corridor Jalan Raya Bogor, includes DKI Jakarta and West Java provinces have 186 industry, which different spatial dispersed pattern. The Industry has an impact to local community for worker industry. The analysis with nearness neighborhood and overlay map are conclusion as industry has cluster pattern at Cisalak Pasar, Cilangkap, and Cisalak district. And the industry patterns have random spatial at Tugu, Mekarsari, Sukamaju Baru, and Jatijajar district. The industry spatial has a dispersed pattern/uniform at Susukan, Ciracas, Pekayon, Curug, and Sukamaju district. The local community for worker industry has 62.04% senior high school and 2.81% elementary school or not education
REFLECTION INFLUENCE ON OUTPUT FREQUENCY SPECTRUM AT SUBMILLIMETER FREQUENCY TUNABLE GYROTRONS Aripin, Aripin; Kurniawan, B.
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

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
Publisher : UI Scholars Hub

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Abstract

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.
SPEKTROSKOPI INFRAMERAH SENYAWA KALSIUM FOSFAT HASIL PRESIPITASI Soejoko, Djarwani S.; Wahyuni, Sri
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

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.
Morphological and Molecular Analysis and Flowering Time of T2 Generation Transgenic Rice cv. Nipponbare Carrying CONSTANS (CO) Gene
Makara Journal of Science
Publisher : UI Scholars Hub

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Abstract

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.
Two New Records of Wild Bananas (Musa balbisiana and Musa itinerans) from Sulawesi
Makara Journal of Science
Publisher : UI Scholars Hub

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Abstract

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.
Construction and Characterization of Conductometric Biosensor for Determination of the Diazinon Concentration
Makara Journal of Science
Publisher : UI Scholars Hub

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Abstract

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.
Effectiveness of Powder and Solid Ragi Starter on Production of Bioethanol from Rice Straw Hydrolyzate
Makara Journal of Science
Publisher : UI Scholars Hub

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Abstract

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.

Page 62 of 88 | Total Record : 880

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