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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
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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 11 Documents
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Search results for , issue "Vol. 16, No. 2" : 11 Documents clear
X-ray Diffraction Phase Analyses of Mullite Derived from Rice Husk Silica Sembiring, Simon; Simanjuntak, Wasinton
Makara Journal of Science Vol. 16, No. 2
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Abstract

X-ray Diffraction Phase Analyses of Mullite Derived from Rice Husk Silica
Antihypertensive Effect of Brucea javanica (L.) Merr. Fruit Extract Roswiem, Anna P.; Kiranadi, Bambang; Bachtiar, Trias Sanjaya Putra
Makara Journal of Science Vol. 16, No. 2
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The Partition Function of the Bose-Einstein Condensation in Parabolic Trap Prayitno, Teguh Budi; Latifa, Sinta
Makara Journal of Science Vol. 16, No. 2
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We have discussed the partition function of the Bose-Einstein condensation in parabolic trap associated to the one dimensional Gross-Pitaevskii equation. The partition function itself is constructed by considering all the energy levels of the macroscopic quantum oscillator which is similar to statistical mechanics. The solutions of the energy levels for this case can be derived by pursuing the method that applies the time-independent perturbation theory. In this case, the one-dimensional Gross Pitaevskii equation can be treated as the one-dimensional macroscopic quantum oscillator on condition that the nonlinearity is very small. Moreover, the analytical expression for the ground state energy can be obtained by applying the method. However, the higher level states were not explicitly provided. In this research we followed up on the former work to derive explicitly the other states in order to formulate the partition function. However, we did not find the closed form of the partition function since the results of nonlinear term integral could not form the recursion relation. As a consequence, not only should the partition function but also the Helmholtz free energy and entropy should be reevaluated to check their convergences.
Non-Saponifiable Lipid Composition of Four Salt-Secretor and Non-Secretor Mangrove Species from North Sumatra, Indonesia Basyuni, Mohammad; Putri, Lollie Lollie; Julayha, Julayha; Oku, Hirosuke
Makara Journal of Science Vol. 16, No. 2
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Non-saponifiable lipid (NSL) of the fresh leaves and roots from two salt-secretor mangrove species, namely Aegiceras corniculatum (L.) Blanco and Avicennia alba Bl. and two non-secretor mangroves, i.e. Acrostichum aureum L. and Excoecaria agallocha L. was analyzed with special emphasize to triterpenoids and phytosterols. Identification of the triterpenoids and phytosterols was confirmed by comparison of their retention time on the GC column with those of authentic standards and on the interpretation of GC-MS spectra. Triterpenoids and phytosterols comprised the major proportion of NSL. The triterpenoids and phytosterols mainly consisted of 7 and 4 compounds. Triterpenoids were the largest constituent of Ac. aureum and Ae. corniculatum leaves and roots, and E. agallocha roots. In contrast to these triterpenoids-rich species, phytosterols were relatively dominant in the roots of Av. alba. The species of Av. alba and E. agallocha in the leaves were distinguished from the others in that both species contained a larger quantity of phytol. Ae. corniculatum contained a large amount of betulin and α-amyrin in the roots, as well as lupeol in the roots of Av. alba. The diversity in the NSL composition noted with mangrove species in both the leaves and roots suggested that NSL of mangrove leaves and roots can be used as chemotaxonomical character to differentiate species.
Preparation of Sulfonated PVA-TMSP Membranes for Direct Methanol Fuel Cell Haryadi, Haryadi; Riniati, Riniati; Anisa, Sofiatun
Makara Journal of Science Vol. 16, No. 2
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Synthesis and Antiplasmodial Activity of 2-(4-Methoxyphenyl)-4-Phenyl-1,10- Phenanthroline Derivative Compounds Hadanu, Ruslin; Mustofa, Mustofa; Nazudin, Nazudin
Makara Journal of Science Vol. 16, No. 2
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A unique of synthetic methods was employed to prepare 2-(4-methoxyphenyl)-4-phenyl-1,10-phenanthroline (5) derivatives from 4-methoxy-benzaldehyde (1), acetophenone (2), and 8-aminoquinoline (4) with aldol condensation and cyclization reactions. The derivatives were tested through antiplasmodial test. The synthesis of derivatives compound 5 was conducted in three steps. The 3-(4-methoxyphenyl)-1-phenylpropenone 3 was synthesized through aldol condensation of 1 and 2 which has a yield of 96.42%. The compound 5 was synthesized through cyclization of compound 4 and 3 with 84.55% yield. The derivative of compound 5 was synthesized from compound 5 using DMS and DES reagents which refluxed for 21 and 22 h, to produce (1)-N-methyl-9-(4-methoxyphenyl)-7-phenyl-1,10- phenanthrolinium sulfate (6) and (1)-N-ethyl-9-(4-methoxyphenyl)-7-phenyl-1,10-phenanthrolinium sulfate (7) with 91.42 and 86.36% yields, respectively. Results of in vitro testing of antiplasmodial activity of compound 5 derivatives (i.e., compound 6 and 7) against chloroquine-resistant P. falciparum FCR3 strain showed that compound 7 had higher antimalarial activity than compounds 5 and 6. Whereas, results of in vitro testing against chloroquine-sensitive P. falciparum D10 strain showed that compound 6 has higher antimalarial activity than compounds 5 and 7.
The Acoustical Properties of Indonesian Hardwood Species Karlinasari, Lina; Baihaqi, Hans; Maddu, Akhiruddin
Makara Journal of Science Vol. 16, No. 2
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Physiological Responses of Jatropha to Drought Stress in Coastal Sandy Land Conditions Parwata, I Gusti Made Arya; Indradewa, Didik; Yudono, Prapto; Kusmarwiyah, Rukmini
Makara Journal of Science Vol. 16, No. 2
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Jatropha curcas L., an important tropical biofuel crop, is reputed for its drought resistance, however, its ability to perform in dry conditions has still hardly been investigated. Changes in leaf water status, chlorophyll content, leaf surface temperature, stomatal conductance, proline and abcisic acid (ABA) content, transpiration and photosynthetic rate were studied in four Jatropha genotypes (IP-1A, IP-2M, Local superior and Yellow leaf) and subjected to drought stress in coastal sandy land conditions in Central Java, Indonesia. Drought stress significantly decreased the leaf water status, leaf chlorophyll content, stomatal conductance, transpiration and photosynthetic rate, and increased leaf temperature, proline and ABA content. Resistant genotypes (IP-1A and IP-2M) had significantly higher leaf water status, chlorophyll content and photosynthetic rate than susceptible genotypes (Local superior and Yellow leaf). There were no differences between the Jatropha genotypes on leaf temperature, stomatal conductance and transpiration rate
Phytochemical Composition of Selaginella spp. from Java Island Indonesia Chikmawati, Tatik; Setyawan, Ahmad Dwi; Miftahudin, Miftahudin
Makara Journal of Science Vol. 16, No. 2
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Abstract

For a long time, people in West Java, Indonesia have used Selaginella as a traditional cure for several ailments including fever, minor wounds, broken bones, women’s health disorders or postnatal bleeding. However, information on the active compounds of the plant from Java Island has not been fully expounded. The objective of the research was to reveal the diversity of bioactive compounds and amentoflavone content of Selaginella from Java Island in order to optimize the use of this plant as a medicinal plant. Selaginella plants collected from 29 locations in Java were extracted and subjected to colorimetric and thin layer chromatography test to qualitatively analyze the bioactive compounds of alkaloid, phenol, and steroid. In addition, high performance liquid chromatography was performed to analyze the amentofalvone content of Selaginella extract. The research result showed that all the examined Selaginella species contained alkaloid, flavonoid, saponin, tannin, and steroid, but they did not contain hydroquinone. Seven of them contained the biflavonoid type of amentoflavone. The highest amentoflavone concentration, 6.87 ppm, was found in S. subalpina that originated from Gedung Songo, Central Java. Those results indicated that more than one Selaginella species originating from Java Island had marked potential for use as medicinal plants.
Sintering Temperature and Deposition Orientation Effects on Mechanical, Physical Properties and Geometric Distortion of Cu–Ni Single and Multi Material Indirect Sintering Products Widyanto, Susilo Adi; Sutarto, Eko
Makara Journal of Science Vol. 16, No. 2
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Development of multi material mechanical parts is constantly undertaken to increase functional aspectsas well as life cycle. One example is the use of bimaterial which is widely used as a temperature contactor. This paper presents mechanical, physical properties and geometric distortion of Cu-Ni indirect sintering products used to develop Cu-Ni bimaterial products. The experiment was executed with the following method: firstly, Cu and/or Ni powders were deposited into cast iron powder as the supporting powder. Secondly, it was heated in a furnace with varying temperatures of 870 C, 900 C and 930 C with a holding time of four hours. Lastly, deposition orientation was varied to observe the effect on the occurence of shrinkage. To initiate the multi materials sintering process, single material sintering was performed to observe the physical and mechanical properties. Based on previous work, multi material sintering of Cu and Ni powders was conducted. The experiment results showed that the geometric distortion of the sintering products was influenced by deposition orientation. The Cu and Ni products shrinkage were 49% and 35.33%, respectively. Although the melting temperature of Cu and Ni is close, the binding mechanism of the sintered product did not occur. The significant difference of shrinkage levels was the main factor for the binding mechanism failure between Cu and Ni materials.

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