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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 17 Documents
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Search results for , issue "Vol. 6, No. 3" : 17 Documents clear
AKTIVITAS LIPOLITIK Rhizopus microsporus var. rhizopodiformis ISOLAT UICC No. 6 Iman, Iman; Sitaresmi, Sitaresmi; Prayudi, Doni; Kudin, Kudin
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

The lipolytic activity of Rhizopus microsporus var rhizopodiformis isolat UICC No. 6. A study was carried out to examine the effect of peptone concentration (2,5% or 5%), inoculum concentration (0,1%, 0,5% or 1%) and incubation period (0 – 96 hours, interval 12 hours) on the lipolytic activity of Rhizopus microsporus var rhizopodiformis isolat UICC No. 6. Fermentation was done using the basal medium from Samad and the lipolytic activity on olive oil substrate was measured employing titration method with 0,05M NaOH. Lipolytic activity is expressed as unit/ml and one unit is defined as 1 mmol fatty acid liberated per minute. Results show that optimum lipolytic activity was obtained from 1 % inoculum, 5% peptone after 72 hours incubation period
APLIKASI REAKSI KATALISIS HETEROGEN UNTUK PEMBUATAN VANILI SINTETIK (3-HIDROKSI-2-METOKSIBENZALDEHIDA) DARI EUGENOL (4-ALLIL-2-METOKSIFENOL) MINYAK CENGKEH Wibowo, Widajanti; Suwarso, Wahyudi Priyono; Utari, Triesye; Purwaningsih, Henny
Makara Journal of Science Vol. 6, No. 3
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Abstract

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
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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
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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
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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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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
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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.
AKTIVITAS LIPOLITIK Rhizopus microsporus var. rhizopodiformis ISOLAT UICC No. 6 Iman, Iman; Sitaresmi, Sitaresmi; Prayudi, Doni; Kudin, Kudin
Makara Journal of Science Vol. 6, No. 3
Publisher : UI Scholars Hub

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Abstract

The lipolytic activity of Rhizopus microsporus var rhizopodiformis isolat UICC No. 6. A study was carried out to examine the effect of peptone concentration (2,5% or 5%), inoculum concentration (0,1%, 0,5% or 1%) and incubation period (0 – 96 hours, interval 12 hours) on the lipolytic activity of Rhizopus microsporus var rhizopodiformis isolat UICC No. 6. Fermentation was done using the basal medium from Samad and the lipolytic activity on olive oil substrate was measured employing titration method with 0,05M NaOH. Lipolytic activity is expressed as unit/ml and one unit is defined as 1 mmol fatty acid liberated per minute. Results show that optimum lipolytic activity was obtained from 1 % inoculum, 5% peptone after 72 hours incubation period
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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

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