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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 27 Documents
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Search results for , issue "Vol. 12, No. 2" : 27 Documents clear
PENGARUH JANGKAU SUDUT UKUR PADA HASIL ANALISIS DATA DIFRAKSI SINAR-X MENGGUNAKAN METODE RIETVELD: KASUS CAMPURAN MgO-Y2O3 Suminar, Suminar
Makara Journal of Science Vol. 12, No. 2
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Selection of Diffraction Measurement Range and Its Effect on X-ray Diffraction Rietveld Analysis Results: a MgO-Y2O3 Mixture Case. X-ray diffraction data analyses for a MgO-Y2O3 (30% Y2O3 by weight) ceramic composite have been done at various diffraction angle ranges to evaluate the effects to the analyses results. The study was performed as choosing the angle ranges correlates to data collection time and x-ray tube lasting. The analyses utilised Rietveld-based software Rietica. The ranges chosen were (A) 10-100, (B) 10-90, (C) 10-80, (D) 10-70 dan (E) 10-60 °2θ. Results showed that in general the errors of the refined parameters increased with narrower range. Phase composition analyses also showed significant bias when narrower range was used – with range 10-80 °2θ gave tolerable result. Moreover, narrowing diffraction angle in the analysis significantly biases the Lorentzian peak broadening component values particularly for phase with crystallite size estimate more than 100 nm. The study recommends how to choose the range.
STRUKTUR KECEPATAN GELOMBANG S DI BAWAH INDONESIA MELALUI ANALISIS SEISMOGRAM GEMPA-GEMPA BUMI DI SEKITAR INDONESIA PADA STASIUN OBSERVASI UGM Santosa, Bagus Jaya
Makara Journal of Science Vol. 12, No. 2
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Seismogram Analysis of Earthquakes Around Indonesia In UGM Observational Station: S Velocity Structure. The seismogram comparison between the measured and synthetics seismogram has been carried out in observation station of UGM, where the seismograms are excited by earthquakes that occurred at North Sumatra, Sumbawa, Sunda Strait, around North Celebes and PNG. The ray paths from earthquake's hypocenter to UGM give opportunity to understand the earth structure alongside the front area of subduction zone. The calculation of synthetic seismogram needs input in the form of earth model, the Centroid Moment Tensor (CMT) solution of the earthquake and location of observation station, as well as the relevant date file response of the observation station. Waveform comparison and fitting at surface wave indicate that speed's anomalies in the lithosphere have negative character in front area of subducted zone, but become positive for northern area of subduction zone. By paying attention to waveform of Love surface wave, it is obtained, that this waveform are sensitive to the change of earth crust thickness, while Rayleigh waveform is not sensitive. Heterogeneity is not only occurred in the lithosphere, but also in deeper earth layers, until Core Mantle Boundary (CMB). Different corrections are needed to make the fitting at S secondary wave, but also at depth wave and its repetitions. The result of this research shows that the research area, which is located in the front of subduction zone has anomalies at S speed of at deeper earth layers which than the lithosphere. The earth structure as the result of this research differs from the other seismological results, where they used the methods, which are based on inversion of arrival time data of body wave and dispersion analysis on surface wave.
MODEL-INDEPENDENT EXTRACTION OF THE KΛp COUPLING CONSTANT Mart, Terry
Makara Journal of Science Vol. 12, No. 2
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We have extracted the kaon-hyperon-nucleon coupling constant by means of a model-independent method and recent experimental data on kaon photoproduction off a nucleon. The extracted coupling constant is consistent with the SU(3) prediction as well as with the values obtained from the kaon-nucleon scattering process.
PEMURNIAN DAN KARAKTERISASI XILANASE Streptomyces sp. SKK1-8 Meryandini, Anja; Widhyastuti, Nunuk; Lestari, Yulin
Makara Journal of Science Vol. 12, No. 2
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PENGARUH VARIASI INISIATOR DAN TEKNIK POLIMERISASI TERHADAP UKURAN PARTIKEL PADA KOPOLIMERISASI EMULSI STIRENA-BUTIL AKRILAT-METIL METAKRILAT Budianto, Emil; Ariyanti, Ariyanti
Makara Journal of Science Vol. 12, No. 2
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IDENTIFICATION OF SOME STRAINS OF DINOFLAGELLATES BASED ON MORPHOLOGY AND MOLECULAR ANALYSIS Thoha, Hikmah
Makara Journal of Science Vol. 12, No. 2
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Dinoflagellates are the important primary producers in aquatic environments. In oceans, they play interesting role in ecological functions such as red tide forming organisms, symbiont of coral reef or sea anemone and DSP (Diarrhetic Shellfish Poisoning) or PSP (Paralytic Shellfish Poisoning) producing organisms. Morphology and molecular analysis of dinoflagellates were conducted on November 2002 to March 2003. The phylogenetic studies based on 18S rDNA analyses, sequence have begun to appear more frequently in the literature, as attention has turned to relationships within the major eukaryotic lineages, particular importance for the taxonomy of the armored and unarmored genera of dinoflagellates (Gyrodinium sp., Cachonina sp., Gymnodinium sp., Amphidinium sp.), because many of the genera cause extensive plankton blooms, fish kills and other harmful events, were studied used to amplify 18S rDNA, present in the total DNA extracted from algal pellet. The amplify approximately 1400 bp of the nuclear-encoded LSU rDNA gene using terminal primeirs DIR, products were cheked by 1.0 % agarose gel electrophoresis, then cloning with TA cloning KIT. Sequencing were analyzed by the GENETIX Mac Software, Homology search by Blast and Phylogenetic analysis. Results of hylogenetic analysis of 18S rDNA are: Strain no. 10893 (un identified) from the genera, it is belonging Gymnodinium or Polarella. Strain no. 10795 is closely related other species Cachonina hallii. We tentatively named strain no 11151 and 11160 similar to Gyrodinium or Gymnodinium based on morphology, but these strain indepently position in this tree and is not a real of Gymnodinium sensu stricto. It is possible, we can establish the new genera for strain no. 11151; 11160 because this not cluster any other unarmored species.
KORELASI RAGAM AKTIVITAS TERHADAP KEBERHASILAN MAKAN TIGA JENIS KUNTUL DI CAGAR ALAM PULAU DUA TELUK BANTEN, SERANG Elfidasari, Dewi
Makara Journal of Science Vol. 12, No. 2
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Correlation in Activity Variation to Feeding Success on Three Species Herons at Pulau Dua Nature Reserve Banten's Bays, Serang. This research intent to know activity manner influence that did by three species herons for feeding success at Pulau Dua Nature Reserve, Banten Bay, Serang. Observational method that is utilized is direct observing with backed up by picture taking utilizes observation method is focal. Analysis draws to be done by scan sampling method's. Data analyzed by correlation terminologically Spearmann by programs SPSS. Result observationally to point out that activity type was done upon eating is step, strike, catch and devours prey. Result tests Spearmann's correlation proves that activity manner a large part gets positive correlation with feeding success for three species herons depend on different feeding location. Just activity stop and not active just that gets negative correlation with feeding success on three species herons
VARIABILITAS SUHU DAN SALINITAS DI PERAIRAN CISADANE Hadikusumah, Hadikusumah
Makara Journal of Science Vol. 12, No. 2
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The Temperature and Salinity Variabilities at Cisadane Estuary. The study was conducted at Cisadane Estuary at 18 oceanographic station in Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II from 2003 to 2005. The area of the study was located at the longitude of 106.58° - 106.70° E and the latitude of 5.96° - 6.02°S. The measurements of temperature, salinity, tubidity and light transmision used CTD (Conductivity, Temperature and Depth) Model SBE-19. The result shows that the temperature and salinity vertical profil variabilities at Cisadane Estuary underwent a change in the influence of Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II, for example it was obtained the leg time of the maximum salinity of Transition Monsoon Season II as the same as that of East Monsoon Season. Based on the horizontal and vertical distribution pattern analysis of the interaction between low salinity fresh water of Cisadane River and high salinity sea water of Java Sea, it was also influenced by the season variability and tide. The surface layer was much more influenced by the low salinity and the heat of sunray (seasonal variability) with the weaker intensity to the lower layer. The change of the heat energy by the increase of seasonal temperature occurred in September 2003 to May 2004 ((∆E = 600.6 ⋅ 105 Joule), July to November 2005 (∆E = 84.9 Joule). The decrease of the heat energy occurred in June to September 2003 ((-267.6 ⋅ 105 ), May ke October 2004 (∆E = 189.3 ⋅ 105 Joule) and October 2004 to July 2005 (∆E = -215.4 ⋅ 105 Joule).
MODEL-INDEPENDENT EXTRACTION OF THE KΛp COUPLING CONSTANT Mart, Terry
Makara Journal of Science Vol. 12, No. 2
Publisher : UI Scholars Hub

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Abstract

We have extracted the kaon-hyperon-nucleon coupling constant by means of a model-independent method and recent experimental data on kaon photoproduction off a nucleon. The extracted coupling constant is consistent with the SU(3) prediction as well as with the values obtained from the kaon-nucleon scattering process.
PENGAMATAN KADAR MERKURI DI PERAIRAN TELUK KAO (HALMAHERA) DAN PERAIRAN ANGGAI (PULAU OBI) MALUKU UTARA Edward, Edward
Makara Journal of Science Vol. 12, No. 2
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Observation on Mercury Concentration in Kao Bay (Halmahera) and Anggai Waters (Obi Island), North of Maluku. Observation on merkuri concentration in territorial waters of Kao Bay and Anggai have been done in January 2005. The result showed that mercury concentration in seawater and sediment in territorial waters of Kao Bay and Anggai waters still lower and still in line with peaceful threshold value for waters biota life. This data indicate that waste of mercury coming from activity of gold mining by PT Nusa Halmahera Raya (NHR) and illegal gold mining by society not yet polluted both of that waters.

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