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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.
Arjuna Subject : -
Articles 880 Documents
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Use of Carbon Compounds (Carbon Nanotubes and Activated Carbon) in theImprovement of TiO2–Carbon Supercapacitor Performance Sudarto, Joko; Subagio, Agus; Priyono,; Pardoyo,; Yudianti, R.; Subhan,
Makara Journal of Science Vol. 21, No. 2
Publisher : UI Scholars Hub

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Abstract

Improvement ofthe performance of titanium oxide (TiO2)–carbon supercapacitor was studied by fabricating a double-layer electrode compositeconsistingof (TiO2), activated carbon(AC), and carbon nanotubes (CNTs). A thin layer of TiO2/CNT/AC electrode was coated on an aluminum foil substrate through the addition of a polyvynilidene fluoride adhesive of around 15% of the total weight of the composite. The resultant layer was then made into a double layer, and its conductivity and capacitance were measured using the electrochemical impedance spectroscopy (EIS). Results showed that the supercapacitor performance improved with the addition of CNTs. The highest performance was obtained with a composition of 23.3% TiO2, 21.0% CNT, and 4.0% AC with a 1.29×10-2 S/m conductivity and 5.56 F/g capacitance (C) at a frequency of 0.1 Hz.
Characteristics and Ideotype Formulation of Pulasan (Nephelium ramboutan-ake) Fruit Landrace from West Java, Indonesia Djuita, Nina Ratna; Hartana, Alex; Chikmawati, Tatik; Dorly,
Makara Journal of Science Vol. 21, No. 2
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Abstract

Pulasan (Nephelium ramboutan-ake) is a unique tropical fruit, but its morphological variations have not been well characterized. This study was conducted to obtain data on the characteristics of pulasan landrace in West Java, Indonesia, and to formulate the ideotype of pulasan with superior characteristics, such as high fruit weight, sweet taste, and thick and easily peelable aril from the seed. Based on the descriptors of rambutan, 61 fruit variants were observed. The results showed that the average fruit weight was 46.0 g, with the highest at 103.5 g and the lowest at 23.1 g. The °Brix level variation of pulasan fruit was 16.8–29.6, and its vitamin C content was 14.0–24.0 mg/100 g. Five variants with superior fruit characters were identified among the sample collections used in the study
Bioconcentration Factor (BCF) and Translocation Factor (TF)of Heavy Metals in Mangrove Trees of Blanakan Fish Farm Takarina, Noverita Dian; Pin, Tjiong Giok
Makara Journal of Science Vol. 21, No. 2
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Abstract

In the mangrovesof Blanakan, Indonesia, silvofishery practices may play arole in maintaining the environmental quality of ponds. Mangroves are known as pollutant traps since their root systems absorb and accumulate materials. Heavy metals are pollutants that often contaminate aquatic environment like ponds. The bioconcentration factor can be used to evaluate the content of heavy metals in organisms, while the translocation factor can be used to measure the amount of heavy metals transferred form one organ to another. The aim of this study was to determine the bioconcentration factor and the translocation factor of heavy metals (Pb, Cu,andZn) in mangrovetrees (Avicennia and Rhizopora) at the Blanakan ponds. Samples of mangrove trees from 3 stations, were cut using a knife, and samples of sediments were collected using Ekman Bottom Grab sampler. Samples were then prepared for heavy metal content analysis using the Shimadzu 6300 atomic absorption spectrophotometer. The bioconcentration and translocation factorswere calculated using formulas; the bioconcentration factor was calculated as the content of heavy metals in trees divided by the content of heavy metals in sediments. Results showed that the bioconcentration factor of Cu was higher than 1 in the roots, stems and leaves of Avicennia trees and of Zn was higher than 1 in the roots of Rhizopora trees at station 1. Translocation factors higher than 1 were mostly found in Avicennia (Cu) and Rhizopora (Pb) trees. Mangrove trees with translocation values of greater than 1 for one or more heavy metals can be considered as strong accumulators of the corresponding metals.
Biospeciation of Cr(III) Nutritional Supplements in Biological Fluids Safitri, Anna; Levina, Aviva; Lay, Peter A.
Makara Journal of Science Vol. 21, No. 2
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Abstract

Metal ion speciation in various biological systems has been extensively studied to elucidate its biological role and the toxicity of the element of interest. In the present study, chromium speciation was performed by reacting Cr(III) nutritional supplements [Cr(pic)3], where pic = 2-pyridinecarboxylato(-), and a Cr(III) propionate complex, [Cr3O(OCOEt)6(OH2)3])+, in calf serum. Cr(III) complexes in serum were fractionated using size-exclusion chromatography, and the Cr(III) concentrations in each fraction were determined using graphite furnace atomic absorption spectroscopy. The results showed that Cr(III) bound to both high-and low-molecular weight serum fractions. While Cr(III) was mainly bound toalbumin or transferrin, unknown low-molecular-weight serum fractions were also important in Cr binding. The Cr(III) distribution in serum fractions was found to be time-dependent.
Study of Heavy Metal Distribution and Hydrodynamic Simulation in Green Mussel Culture Net, Cilincing Water-Jakarta Bay Koropitan, Alan Frendy; Cordova, Muhammad Reza
Makara Journal of Science Vol. 21, No. 2
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Abstract

This study aimed to investigate the heavy metals distribution inthesurrounding area of green mussel culture net,Cilincing water, Jakarta Bay,and its distribution behavior. The water sampling was carried out during the ebb tide. The heavy metal concentration was then measured by using atomic absorption spectroscopy (AAS). In order to understand the water circulation behavior related to heavy metal distribution in the study area, thePrinceton Ocean Model was applied, and the model design was developed based ona scenario ofanopen canal in theeastern and western sides, while the center canal wasplaced withnet cages in the water column resembling the green mussel culture net. The observed heavy metal distribution showed an intensified concentration in the green mussel culture location. The observed water current also showed a reduced velocity in the location. The modeling approach could explain the water circulation behavior in response to the presence of net units in the water column. In this case, the density of net units for green mussel culture potentially produced shear stress in the water column, which affected the flow pattern and the distribution of heavy metals. Therefore, the existence of green mussel culture nets has a potential to become a trap for pollutant distribution in the water.
Kaon Photoproduction: From an Experimental Point of View Walford, Natalie Kathleen
Makara Journal of Science Vol. 21, No. 1
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Abstract

Today, laboratory experiments conducted worldwide continue to search for undiscovered excited states of the nucleon. The database has been continually updated over the past years to allow for nearly model-independent partial wave analyses (PWA) to be carried out in the search for such undiscovered states. The photoproduction of mesons, such as kaons, has been studied extensively in the past. However, there is still much information that can be gathered and learned from the photoproduction of the kaon. Recent coupled-channel analyses have found strong sensitivity of the K+Λ channel to several higher mass nucleon resonances. Various experiments have provided new and interesting results that are discussed in this short review.
Cytotoxic Triterpenoid from the Stembark of Chisocheton celebicus (Meliaceae) Katja, Dewa Gede; Farabi, Kindi; Harneti, Desi; Mayanti, Tri; Supratman, Unang
Makara Journal of Science Vol. 21, No. 1
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Abstract

Plants belonging to the Chisocheton genus are a rich source of tetracylic triterpenoids with diverse biological activities. Two triterpenoid compounds,dammar-20,24-dien-3-one (1) and 3β-hydroxy-tirucall-7-en (2) were isolated from the stembark of Chisocheton celebicus. The chemical structures of compounds 1 and 2 were identified by spectroscopic data, including IR, NMR (1H, 13C, DEPT 135°, HMQC, HMBC, 1H-1H COSY), and MS, and they were compared with previously reported spectral data. Compounds 1 and 2 were evaluated for their cytotoxic effects against P-388 murineleukemia cells. The compounds showed cytotoxicity against P-388 murine leukemia cells, with IC50 values of 30.2 and 4.3 μg/mL, respectively.
Analysis of Putative Hybrid between Anaphalis longifolia and A.javanica (Asteraceae) in Mount Talang, West Sumatra based on Anatomical Characteristics Fajrina, Anzharni; Mansyurdin,; Syamsuardi,
Makara Journal of Science Vol. 21, No. 1
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Abstract

heputative natural hybrid between Anaphalis longifolia and Anaphalis javanica from Talang Mountain in West Sumatra has been discovered. The aim of this research is to analyze the anatomical characteristics of the leaf and stemto clarify the status of this putative natural hybrid. The anatomical characteristics of leaves and stem were analyzed by making cross sectionsand paradermal sectionsusing Johansen’s method. The results show seven characteristics of this putative natural hybrid (the stomata density, length, width, andlength/width ratio; the number of cortical cell layers, the range of cortex length, and the range of cortex width) that were close to A. longifolia, one characteristic that was close to A. javanica (the structure of palisade), one characteristic that was intermediate (the structure of spongy layer), and one characteristic that was a combination of both of them (the trichome morphotype). All of the foregoing characteristics can be used to support the identification of a natural hybrid of A. longifolia and A. javanica.
Synthesis and Characterization of Nio Nanocrystals by using Sol-Gel Method with Various Precursors Ningsih, Sherly Kasuma Warda; Khair, Miftahul
Makara Journal of Science Vol. 21, No. 1
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Abstract

Nickel oxide (NiO) nanocrystals were synthesized by simple sol-gel method at low temperature by using methanol as the solvent and NaOH 5M as the precipitation agent. Nickel nitrate hexahydrate, nickel acetate tetrahydrate and nickel sulfate hexahydrate were used as the precursors. The crystals were formed by drying at 100-110 °C for ± 1 hour, after which they were heated at ± 450 °C for 1 hour. The resulting products were black powders. The as-prepared NiOnanocrystals were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD patterns of the NiO nanocrystals showed that they are mostly cubic. The sizes of the NiO particles produced with nickelnitrate hexahydrate, nickel acetate tetrahydrate and nickel sulfate hexahydrate were 72.16, 38.63 and 32.84 nm, respectively. SEM images showed that the nanopowders produced by the precursors are spherical, rod-shaped andhexagonal shape with hollow, respectively.
Fe(III) Oxide-modified Indonesian Bentonite for Catalytic Photodegradation of Phenol in Water Pradisty, Novia Arinda; Sihombing, Riwandi; Howe, Russell Francis; Krisnandi, Yuni Krisyuningsih
Makara Journal of Science Vol. 21, No. 1
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Abstract

Phenol, which is a major organic pollutant, is usually detected in industrial wastewater, and thus the wastewater should be processed further before discharged into water bodies. Application of heterogeneous catalysis using natural-basedmaterials is known to be effective and environmentallyfriendlyinremoving hazardous substances in water. In this study, local natural bentonite from the Tapanuli region in Indonesia was modified to eliminate dissolved phenol. Elimination by photodegradation reaction was conductedinaphoto-Fenton system utilizing Fe(III) oxide-modifiedbentonite (Fe-B) as catalyst. Fe-B was prepared byacation exchanging process using mixture solutions of NaOH and FeCl3 with OH/Femolar ratio of 2:1 and calcined at 300 °C. Material characterization was performed by X-ray diffraction (XRD), low-angle XRD, Fourier transform infrared spectroscopy and atomic absorption spectroscopy. The reaction components consisted of ultraviolet Clight, H2O2, and Fe-B, and they were processed in a batch reactor. The role of each component was analyzed by a series of reaction conditions (i.e., adsorption, photolysis, H2O2effect, Fenton, and homogeneous photo-Fenton). The heterogeneous photo-Fenton system was found to be essential for phenol degradation, as none of the reaction conditions caused total phenol removal in the 180 min reaction time. To conclude, heterogeneous photo-Fenton gave the highest photodegradation activity, and the best experimental condition for 1.10 mM phenol removal was 5 g L-1 catalyst, 78.35 mM H2O2, and 90 minreaction time.

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