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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 7 Documents
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Search results for , issue "Vol. 8, No. 3" : 7 Documents clear
STUDI KANDUNGAN LOGAM Pb DALAM BATANG DAN DAUN KANGKUNG (Ipomoea reptans) YANG DIREBUS DENGAN PENAMBAHAN NaCl DAN ASAM ASETAT Kohar, Indrajati; Hardjo, Poppy Hartatie; Jonatan, Melyana; Agustanti, Onie
Makara Journal of Science Vol. 8, No. 3
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Study on The Content of Pb in Twigs And Leaves of Kangkung (Ipomoea reptans Poir) Boiled With The Addition of NaCl And Acetic Acid. Kangkung is a kind of favorable vegetables that used to grow near a river, and is cultivated and watered with water from the river. If the river is polluted by heavy metals, there is a risk that the plant is contaminated too. A study on the content of Pb in kangkung planted in Pb contaminated media has been conducted, and it was proven that Pb was found in the plant. Land kangkung (Ipomoea reptans) was used as sample, and was planted in hydrophonic media, and watered with Multigrow Complete Plant Food (2000 mg/L) and Pb solution (2 mg/L) twice a day. Samples were taken based on the age of 54 days, then the twigs and leaves were boiled in different ways: I. Boiled with no addition, II. Boiled with addition of NaCl , and III. Boiled with addition of acetic acid. IV. Unboiled sample as the control. Inductively Coupled Plasma Spectrometer (ICPS) Fison 3410+ was used to measure the Pb content. It was shown that boiling the kangkung reduced the Pb content in the leaves as well as in the twigs; however, the acetic acid addition showed the least effect. In the leaves the three different ways of boiling did not show significant different, while in twigs the different was significant.
KAJIAN KEMAMPUAN GENERALISASI SUPPORT VECTOR MACHINE DALAM PENGENALAN JENIS SPLICE SITES PADA BARISAN DNA Kerami, Djati; Murfi, Hendri
Makara Journal of Science Vol. 8, No. 3
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Study on Generalization Capability of Support Vector Machine in Splice Site Type Recognition of DNA Sequence. Recently, support vector machine has become a popular model as machine learning. A particular advantage of SVM over other machine learning is that it can be analyzed theoretically and at same time can achieve a good performance when applied to real problems. This paper will describe analytically the using of SVM to solve pattern recognition problem with a preliminary case study in determining the type of splice site on the DNA sequence, particularity on the generalization capability. The result obtained show that SVM has a good generalization capability of around 95.4 %.
KELIMPAHAN PLANKTON DI PERAIRAN BANGKA-BELITUNG DAN LAUT CINA SELATAN, SUMATERA, MEI - JUNI 2002 Hikmah, Hikmah
Makara Journal of Science Vol. 8, No. 3
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Plankton Abundance in Bangka – Belitung and South China Sea Waters, May - June 2002. The observation of plankton condition in Bangka, Belitung and South Cina Sea was conducted during May – June 2002. The parameters observed were focused on the microplankton and macroplankton communities. Twenty seven points of observation were grouped into two locations based on the distance of the observation station. Plankton abundance varied with location groups from 2069 to 23392 cells/l and 1249 to 5448 individuals/m3 for microplankton and macroplankton, respectively. Microplanktonic community structure was dominated by the group of diatoms, such as Skeletonema, Chaetoceros, Rhizosolenia, and Thalassiothrix. The genus Ceratium, Dinophysis and Protoperidinium (the group of dinoflagellates) was found in relatively abundant, but still in normal condition. The structure of macroplankton was dominated by the group of copepods (50 – 89%) and larvacea (10- 30 %).
IN VITRO CULTURE OF Pogostemon cablin BENTH. (NILAM PLANT): THE EFFECT OF NAA AND BAP ON EMBRYOGENIC CALLUS PROLIFERATION AND SUBSEQUENT SOMATIC EMBRYOGENESIS Zulkarnain, Zulkarnain
Makara Journal of Science Vol. 8, No. 3
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An experiment to investigate the somatic embryogenesis from shoot-derived callus of Pogostemon cablin (nilam plant) has been conducted at the Plant Biotechnology Laboratory, Agricultural Faculty, University of Jambi from January through to July 2004. Callus proliferation was induced on explants taken from young shoots cultured on solid MS medium supplemented with phytohormones NAA (0.8, 1.1, 1.4, and 1.7 ppm) and BAP (1.1, 1.4, 1.7, and 2.0 ppm) under in vitro conditions. Cultures were maintained at 25 ± 1 oC, light intensity 50 mmol m-2 s-1, and 16 hours photoperiod. The results indicated that all cultured explants showed positive responses on callus proliferation on all treatments within two weeks of culture initiation. The effect of phytohormones, however, was unspecific as all callus showed similar properties, from non-embryogenic to embryogenic. The addition of NAA and/or BAP to the culture medium was not significantly affected the number of days to callus proliferation. Callus fresh weight was significantly affected by NAA (P = 0.01) or BAP (P = 0.05), but the interaction of these phytohormones resulted in a non-significant effect on callus fresh weight (P = 0.18). Also, BAP significantly affected callus dry weight (P =0.03). However, neither NAA nor its interaction with BAP significantly affected callus dry weight (P = 0.07 and 0.16, subsequently). Embryogenic and non-embryogenic callus were subcultured separately onto new fresh media with the same composition as for callus induction. Following this subculture, embryogenic callus regenerated somatic embryos within ten days, whereas non-embryogenic callus did not show any symptom of embryogenesis, and lost their proliferative capacity after six weeks of subculture. The regenerated somatic embryos continued to grow to form profuse mass of young plantlets ready for in vivo acclimatization.
PERHITUNGAN POLARISASI SPONTAN DAN MOMEN QUADRUPOL POTENSIAL LISTRIK BAHAN PIZT (PbInxZryTi1-x-yO3-x/2) Hikam, Muhammad; Sarwono, Edy; Irzaman, Irzaman
Makara Journal of Science Vol. 8, No. 3
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PZT (PbZr1-xTixO3 ) merupakan bahan berbentuk kristal perovskite yang dapat dimanfaatkan sebagai sensor inframerah. Penambahan sedikit dopan (bahan pendoping) dapat mengubah secara drastis karakteristik spesifik dari bahan keramik-ferroelektrik seperti polarisasi spontan, sifat dielektrik, sifat elektromekanik, elektrooptik dan sifat lainnya. Hard doping dengan menggunakan ion In3+ diaplikasikan pada penelitian ini dan dilakukan penumbuhan lapisan tipis dari bubuk PIZT (PbInxZryTi1-x-yO3-x/2) pada substrat Si(100) dengan metode Chemical Solution Deposition (CSD) dengan konsentrasi 0,5 M dan kecepatan putar spin coating 3000 rpm. Karakteristik bahan PIZT baik bubuk maupun lapisan tipisnya diuji dengan difraksi sinar x. Analisis Rietveld dilakukan dengan menggunakan program GSAS-EXPGUI dan diperoleh parameter kisi dan komposisi fasa dari kristal. Polarisasi spontan (Ps ) PIZT bubuk dan lapisan tipisnya mengalami penurunan dibandingkan dengan bahan asalnya (PZT). Polarisasi spontan yang optimum dari lapisan tipis PIZT dicapai pada rentang doping 0,5% - 1% In2O3. Momen quadrupol potensial listrik (FQ(r) ) bahan PIZT pada suatu titik P (0,0,2a) mencapai kondisi optimum pada % doping 6% In2O3 dan dari hasil penelitian ini juga menunjukkan bentuk lapisan tipis PIZT memiliki nilai (FQ(r)) yang lebih baik daripada bentuk bubuknya untuk rentang doping > 1% In2O3.
KANDUNGAN BAHAN ORGANIK, N-ALKANA, AROMATIK DAN TOTAL HIDROKARBON DALAM SEDIMEN DI PERAIRAN RAHA KABUPATEN MUNA, SULAWESI TENGGARA Marsaoli, Muhajir
Makara Journal of Science Vol. 8, No. 3
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The content of organic material, n-alkana, aromatic compound and hydrocarbon total in the sediment was carried out in the waters of Raha, Southeast of Sulawesi. Investigation on content of organic material, n-alkana, aromatic compound and hydrocarbon total in the sediment was carried out in the waters of Raha, Southeast of Sulawesi in June 2001. The results showed that the sediment at station 1 and 4 were polluted by hydrocarbon compound. This condition is showed by F1/F2 ratio (comparation between saturated hydrocarbon fraction with aromatic hydrocarbons fraction) > 1. According to NAS (National Academy of Science) criteria on total hydrocarbon content, station 2 and 5 only were polluted by hydrocarbons compound (>100 ppm).
SUMBERDAYA TERIPANG DI PERAIRAN TANJUNG PAI PADAIDO BIAK NUMFOR PAPUA Yusron, Eddy
Makara Journal of Science Vol. 8, No. 3
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Sea Cucumber Resources At Tanjung Pai Waters Padaido Biak Numfor Papua. Observation on sea cucumber diversity was carried out at coastal waters of Pai and Imbeyomi Islands in the Padaido Island Biak Numfor. Sampling was done by using a transect quadrant of 1 m x 1 m. This sampling and observation on its microhabitat were conducted by snorkling. Analyses on the sea cucumber community structure were based on its frequency of occurance, diversity, and density. The results showed that at both locations 10 species of sea cucumber were found where Holothuria edulis, H. atra, and H. nobilis were predominant common and more evenly distributed than the other species.

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