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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 16 Documents
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Search results for , issue "Vol. 14, No. 1" : 16 Documents clear
KOPOLIMERISASI CANGKOK (GRAFT COPOLYMERIZATION) N-ISOPROPILAKRILAMIDA PADA FILM SELULOSA YANG DIINDUKSI OLEH SINAR ULTRAVIOLET DAN KARAKTERISASINYA Suka, Irwan Ginting
Makara Journal of Science Vol. 14, No. 1
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STUDI PERBANDINGAN SIFAT MEKANIK POLYPROPYLENE MURNI DAN DAUR ULANG Jun, Bernadeth Jong Hiong; Juwono, Ariadne L
Makara Journal of Science Vol. 14, No. 1
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DSC, FTIR, hardness, polypropylene, SEM, tensile strength
GEOELECTRICAL METHOD FOR SUBSURFACE PROFILING COMPARISON: CASE STUDY IN TAWANG AND SABAK AREA, NORTH KELANTAN, MALAYSIA Islami, Nur
Makara Journal of Science Vol. 14, No. 1
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The study area is located in North Kelantan, Malaysia. The North Kelantan plain is covered with quaternary sediments overlying granite bedrock. The drainage system is dendritic with the main river flowing into the South China Sea. Geoelectrical resistivity profiling surveys were conducted to determine the characteristics of the subsurface and the groundwater within the aquifer. The geoelectric resistivity surveys are made up of twelve resistivity traverses at five different sites. Each site has two or more lines which are perpendicular and parallel to the beach line. The zone of brackish water is very clearly seen in the resistivity inverse model with the position around 20 m of depth. This aquifer is referred to the second aquifer. The subsurface profile in site 1, 2 and 3 which is perpendicular to the beach line shows a wavy pattern. The profile which is parallel to the beach line shows almost planar non wavy pattern. In site 4 and site 5, the profile shows an almost flat.
HUBUNGAN FILOGENETIK SPESIES LIMNONECTES (RANIDAE: AMPHIBIA) ASAL SUMATERA BARAT DAN ASAL ASIA TENGGARA BERDASARKAN GEN 16S RIBOSOMAL RNA Tjong, Djong Hon; Iskandar, Djoko T.; Gusman, David
Makara Journal of Science Vol. 14, No. 1
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Phylogentic Relationship among Limnonectes (Ranidae: Amphibia) found in West Sumatra with Other Species from South East Asia based on the based on the 16S rRNA Gen. The objective of this research was to study the phylogenetic relationship among Limnonectes species found in West Sumatra and with other species from South East Asia based on the partial DNA sequences16S rRNA sequences. DNA sequences were aligned using ClustalX version 1.64b, and the phylogenetic relationship within samples were analyzed using PHYLIP version 3.5c program. The alignment showed that, from 805 sites, there are 250 parsimony informative polymorphism sites. The phylogenetic tree showed that all of the Limnonectes spesies were divided in two clusters, the L. blythii complex and L. kuhlii complex. L. kuhlii and L. sp1 clustered into L. kuhlii complex and L. shomponerum and L. macrodon were clustered to L. blythii complex. This result showed that L. kuhlii and L. blythii are species complexes that are actually constituted of several species.
KEANEKARAGAMAN JENIS OPHIUROIDEA (BINTANG MENGULAR) DI PERAIRAN WORI, MINAHASA UTARA, SULAWESI UTARA Yusron, Eddy
Makara Journal of Science Vol. 14, No. 1
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Ophiuroidea Biodiversity in the Wori Waters, Minahasa Utara, North Sulawesi. A total of 10 Ophiuroidea species was found in Wori waters, North Sulawesi. The Ophiuroideas the most were relatively common group in seagrass area. The quantitative on the abundance data revealed the highest diversity index of faunal assemblage at Wori II transect 3 (H = 4.276) while the highest evenness index was exhibited by the Ophiuroidea from Wori III transect 6 (J = 0.821).
TENGGELAMNYA JAKARTA DALAM HUBUNGANNYA DENGAN KONSTRUKSI BANGUNAN BEBAN MEGACITY Manik, Jack M; Marasabessy, M Djen
Makara Journal of Science Vol. 14, No. 1
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Sinking of Jakarta in Relation with Building Construction Namely Megacity Load. The Jakarta city which lies on low coastal plain is home of over ten millions mof people. The number of population has been growing together with the constructions of high rise buildings. The buildings with all of the materials and people who live and use them together with continuous ground water extraction have resulted in undergone dramatic subsidence and other following negative impacts such as permanent flooding. This paper explicitly propose a hypothesis that the total weight of the megacity and the population tends to cause subsidence in coastal area and the charge in the earth isostasi, as well as in earth rotation.
DISOLUSI MIKROENKAPSULASI KURKUMIN TERSALUT GEL KITOSAN-ALGINAT-GLUTARALDEHIDA Herdini, Herdini; Darusman, Latifah K; Sugita, Purwantiningsih
Makara Journal of Science Vol. 14, No. 1
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Dissolution of Curcumin Microencapsulation Coated by Chitosan-Alginate-Glutaraldehide. In vitro dissolution of curcumin coated by chitosan-alginate gel in its optimum condition was studied. The maceration process using 17.08% ethanol yields and the content of the curcumin in the extract detected by visible spectrophotometry λ 430 nm is found to be 10.30 %. Its optimum condition was obtained using response surface method at concentrations ratio of alginate 0.62% (b/v) and glutaraldehide 4.63% (v/v) , respectively, where the chitosan concentration was fixed (1.75% [b/v]). The dissolution assay was done at 37 o C, at 100 rpm of stirring rate in 8 hours. Aliquots were taken at 15, 30, 45, 60, 90, 120, 150, 180, 240, 300, 360, 420, 480 minutes. Absorbance of the Aliquots was measured at λ 430 nm. The curcumin released has the best linear correlation to the first order reaction with released constant, k = 2.24 10-3 minute-1 while it’s half live is t1/2 = 5.16 hours. Release curcumin was determined mainly by diffusion mechanism. Compared to the result based on Fick model, the one of Higuchi model is better in agreement in reproducing the released data.
ISOLASI DAN SKRINING MOLEKULER BAKTERI ASAM LAKTAT PEMBAWA GEN GLUKANSUKRASE DARI MAKANAN DAN MINUMAN MENGANDUNG GULA Malik, Amarila; Hermawati, Ajitya Kurnia; Hestiningtyas, Mahardhika; Radji, Maksum
Makara Journal of Science Vol. 14, No. 1
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Isolation and Molecular Screening of Glucansucrase Gene Harboring-Lactic Acid Bacteria. Exopolysaccharides (EPS) have been possessed to be used in pharmaceutical, cosmetic and food industries. Lactic acid bacteria (LAB) produce a wide variety of exopolysaccharides and carries sucrase genes glucansucrase/glucosyltransferase (gtf) and fructansucrase/fructosyltransferases (ftf) for EPS production. In this study, the isolation and screening of EPS producing-LAB (EPS-LAB) were carried out on modified de Mann-Rogosa-Sharpe (MRS) agar medium supplemented with 10% of sucrose on LAB isolated from various unique sugar containing-foods and -beverages originated from local sources. Besides obtaining EPS-LAB, this study aimed to screen for gtf gene as well as to molecular identify strains by using PCR technique. Degenerate primer pairs DegFor and DegRev which targeted the conserved region of gtf genes catalytic domain were used, whereas LABfw and LABrv were used to molecular identify strains using 16S rRNA gene. An approximately 660 base pairs (bp) amplicons which targeted gtf gene were obtained from 13 out of 16 srains chosen. Result from PCR of 16S rRNA gene identification on gtf positive strains revealed that all strains were molecular identified as LAB after DNA sequencing analysis by using blastn. A rare EPS-producing LAB were obtain i.e. Weissella. Strains obtained in this study are potential sources for exploring novel sucrase gene/s and obtain unique EPS polymer product/s.
KUALITAS SPERMATOZOA DARI TANAMAN Polyscias guilfoylei Elya, Berna; Kusmana, Dadang; Krinalawaty, Nevy
Makara Journal of Science Vol. 14, No. 1
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Spermatozoa Quality from Polyscias guilfoylei. In our study, we investigated the effect of extract Polyscias guilfoylei L.H. Bailey leaves on spermatozoa quality in rabbits. The experiment used 18 male rabbits from New Zealand white strain which were devided randomly into three groups. Group I was normal control group, Group II and III were given the extract of Polyscias guilfoylei leaves in these following doses: 327.56 mg/1.5 kg body weight and 655.2 mg/1.5 kg bw. The extract was given orally once a day, continuously for 8 weeks. Semens from the rabbit was taken every two weeks and were observed over the quality and consentration of spermatozoa. The result of the research showed that the extract of Polyscias guilfoylei leaves with dosage of 327.56 mg/1.5 kg bw and 655.2 mg/1.5 kg bw could decrease the consentration and the quality of spermatozoa of the male rabbits
PENYISIHAN LOGAM BERAT DARI LIMBAH CAIR LABORATORIUM DENGAN METODE PRESIPITASI DAN ADSORPS Suprihatin, Suprihatin; Indrasti, Nastiti Siswi
Makara Journal of Science Vol. 14, No. 1
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Removal of Heavy Metals from Liquid Laboratory Waste Using Precipitation and Adsorption Methods. Liquid laboratory waste (such as residue of chemical oxygen demand/COD analysis) contains high concentration of heavy metals (mercury/Hg, silver/Ag and chrome/Cr) and has a high potential to pollute the environment. The liquid waste generated by laboratories is generally in small quantity, but it is extremely toxic. It is urgently in need to find out an appropriate method to reduce the problems according to the liquid waste characteristics. In this research work, precipitation and adsorption methods were evaluated to remove Hg, Ag, and Cr from liquid laboratory waste, covering determination of optimum process conditions, levels of removal and achievable treated waste quality. Results showed that a Cr removal of 97% was obtained by pH 10, and Hg and Ag removals of 97-99% were reached by pH 12. Although heavy metals removals using precipitation was very significant, but the concentration of heavy metals in the treated waste was still high (0.73-2.62 mg/L) and need for further treatment. Applying activated carbon adsorption for further treatment of the effluent reduced dissolved heavy metals to 0-0.05 mg/L, depending on the type of heavy metals as well as the type and dosing of activated carbon.

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