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Makara Journal of Science
Published by Universitas Indonesia
ISSN : 23391995     EISSN : 23560851     DOI : https://doi.org/10.7454/mss
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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 8 Documents
 1 
Search results for , issue "Vol. 10, No. 2" : 8 Documents clear
GENERIC REED SOLOMON ENCODER Petrus, Petrus
Makara Journal of Science Vol. 10, No. 2
Publisher : UI Scholars Hub

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Abstract

Cellulose having a medium-responsive function were synthesized by photografting of methacrylic acid (MAA) on regenerated cellulose film (thickness = 20 µm) at 60°C using mixed solvent consisting of water and organic solvents such as acetone and methanol. Xanthone was used as photoinitiator by coating on the film surfaces. A maximum percentage of grafting was observed at a certain concentration of organic solvent. MAA-grafted cellulose films produced showing homogeneous distribution of grafted chains, which was examined by scanning electron microscopy. The modified films also exhibit medium responsive character, it shrinks in acidic and swells in basic solution. Moreover, the grafted film exhibited the ability to absorb copper ion, which was not influenced by the solvent used in grafting processes.
MENENTUKAN NILAI EKSTREM SUKU BANYAK TERTENTU DENGAN PERTIDAKSAMAAN RATA-RATA Junus, Kasiyah M
Makara Journal of Science Vol. 10, No. 2
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Abstract

algebraic mean, geometric mean, inequalityof the means
KOMPOSISI DAN KANDUNGAN PIGMEN UTAMA TUMBUHAN TALIPUTRI Cuscuta australis R.Br. DAN Cassytha filiformis L. Heriyanto, Heriyanto; Leenawaty, Leenawaty
Makara Journal of Science Vol. 10, No. 2
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The Composition and The Content of The Main Pigments on Dodders Plant Cuscuta australis R.Br. and Cassytha filiformis L. Research on dodders plant Cuscuta australis R.Br. and Cassytha filiformis L was done to analyze their pigment composition and content. The pigment composition was analyzed by the use of thin layer chromatography (TLC) method based on spot color and retardation factor. The water content was measured according to Sudarmadji et. al. The chlorophylls and carotenoid contents were calculated by Porra et. al. and Gross equation, respectively. Result showed that Cuscuta australis R.Br. (green yellowish and orange) and Cassytha filiformis L. (green and brown reddish) had similar pigment composition consist of carotene, pheophytin a, chlorophyll a, chlorophyll b and xanthophyll. The average of the chlorophyll content from the highest to the lowest one was Cassytha filiformis L. green followed by Cuscuta australis R.Br. green yellowish and orange, while the total chlorophyll of Cassytha filiformis L. brown reddish was relatively similar with other dodders plant. The average of the carotenoid content from the highest to the lowest was Cuscuta australis R.Br. orange followed by Cuscuta australis R.Br. green yellowish. The pigment content of Cassytha filiformis L. was relatively similar to Cassytha filiformis L. brown reddish.
BACTERIOLOGICAL STUDY OF THE MARINE WATER IN THE COASTAL OF THE NORTH SULAWESI PROVINCE, INDONESIA Sutiknowati, Lies Lies
Makara Journal of Science Vol. 10, No. 2
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The main objective of this research was to study the marine bacteriology of the coast of North Sulawesi. The study was accomplished by calculating the abundance of coliform, heterotrophic, and pathogenic bacteria, and analyzing the coexistence relationship between bacteria and phytoplanktons. This research, which included the sampling and laboratory works, has been carried out on 25 – 28 October, 2000. The results suggested that the abundance of each bacteria was as follows: coliform bacteria range between 227-5940 cfu/100 ml with averages 1814.1 cfu/100 ml, found in all stations; heterotrophic bacteria range between (1-82) x 103 cfu/ml with averages 12.1 x 103 cfu/ml, it was high density and has association with phytoplankton Trichodesmium thieubautii. It was also found 6 species of pathogen bacteria e.g. Aeromonas, Citrobacter, Proteus, Pseudomonas, Yersinia and Shigella. The presence of coliform and pathogen bacteria was indicator of low quality of the seawater in the sampling area. Based on bacteriological study, the North Sulawesi Coastal is not suitable for aquaculture and need treatment and controlled for further coastal exploitation.
PENYISIPAN TANDA AIR PADA CITRA DIJITAL BERBASIS DEKOMPOSISI NILAI SINGULIR (DNS) Basaruddin, T; Cahyana, Cahyana
Makara Journal of Science Vol. 10, No. 2
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Imperceptible of Watermarking in Digital Image Based Singular Value Decomposition. Watermarking is a commonly used technique to protect digital image from unintended used such as counterfeiting. This paper will address one of the techniques to embed a watermark to digital image which is based on the singular value decomposition. The primary target to be achieved by a good watermarking technique is that the watermarked image is imperceptible and that the inserted image can still be perfectly retrieved even though various transformations are done to the watermarked image. Our works show that the SVD-based watermarking demonstrates both imperceptibility as well as robustness of the watermarking scheme as indicated by significantly high value of correlation between the inserted and retrieved logo after some transformation such as PSNR, RML and Compression.
PERBANDINGAN PROFIL DISTRIBUSI VERTIKAL 137Cs DI LAPISAN TANAH HASIL PENGUKURAN TERHADAP SIMULASI Suhartini, Nita
Makara Journal of Science Vol. 10, No. 2
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Comparison Of 137Cs Vertical Distribution Profile At Soil Layer Obtained By Measurement And Simulation. This investigation aimed to compare a profile of 137Cs vertical distribution at soil layer in the stable site (undisturbed site). Conservation forest that has been becoming as conservation area since 1925 namely Gn. Pangrango was selected as study site. Sampling of soil was done in Pancawati – Ciawi. Sampling was done by using scrapper ( 20 x 50) cm, with layer increment of 2 cm until the depth of 24 cm (107 kg/m2) or 26 cm (137 kg/m2), and sampling was done at 5 points. Soil samples were brought to the laboratory for preparation and analysis of 137Cs content by using MCA at 662 keV energy. The result showed that the comparison of 137Cs vertical distribution profile between measurement and simulation has a significant differences.
KEPADATAN POPULASI DAN PERTUMBUHAN KERANG DARAH Anadara antiquata L. (Bivalvia: Arcidae) DI TELUK SUNGAI PISANG, KOTA PADANG, SUMATERA BARAT Nurdin, Jabang; Marusin, Neti; Izmiarti, Izmiarti; Anjas, Anjas
Makara Journal of Science Vol. 10, No. 2
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The population density and growth of the cockle Anadara antiquata L. Pelecypoda in Pisang River bay area Padang city, west Sumatera. The research has been done from March to December in 2004. The cockles A. antiquata were collected with systimatic stratified method. The cockle A. antiquata colletion site were divided three strata. The each strata were divided three station based on the water depth. Results of the research showed that the higest density of the cockle A. antiquata was found at station 1 strata III (1.8 ind./m2) and the lowest density at the station 3 strata I (0.9 ind./m2). The higest growth rate of A. antiquata was the length 3 cm (0.064 ± 0.043 cm/ind./15 day) and the lowest growth rate was the length 5 cm (0.009± 0.011 cm/ind./15 day) with corellation similarity Y=0.087–0.0165X; r=0.976).
EFFECT OF MIXED SOLVENTS CONSISTING OF WATER AND ORGANIC SOLVENT ON PREPARATION OF MEDIUM-RESPONSIVE GRAFTED CELLULOSE FILM BY MEANS OF PHOTOGRAFTING Suka, Irwan Ginting
Makara Journal of Science Vol. 10, No. 2
Publisher : UI Scholars Hub

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Abstract

Cellulose having a medium-responsive function were synthesized by photografting of methacrylic acid (MAA) on regenerated cellulose film (thickness = 20 µm) at 60°C using mixed solvent consisting of water and organic solvents such as acetone and methanol. Xanthone was used as photoinitiator by coating on the film surfaces. A maximum percentage of grafting was observed at a certain concentration of organic solvent. MAA-grafted cellulose films produced showing homogeneous distribution of grafted chains, which was examined by scanning electron microscopy. The modified films also exhibit medium responsive character, it shrinks in acidic and swells in basic solution. Moreover, the grafted film exhibited the ability to absorb copper ion, which was not influenced by the solvent used in grafting processes.

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