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Jurnal Sains Dasar

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Published by Universitas Negeri Yogyakarta

ISSN : 20859872 EISSN : 24431273 DOI : 10.21831

Core Subject : Education,

Education

Arjuna Subject : -

Articles 16 Documents

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Search results for , issue "Vol 3, No 2 (2014): October 2014" : 16 Documents clear

Cellulose production from modified cassava skin 2-mercaptobenzotiazole for controlling cadmium (II) metal pollution Yusuf, Bohari; Alimuddin, Alimuddin; Saleh, Chairul; Rahayu, Desy Ridho
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The research study of cadmium (II) metal ion adsorption in a solution by 2-mercaptobenzotiazole modified cellulose and unmodified cellulose had been done. The aims of this research are to know the ability of 2-mercaptobenzotiazole modified and unmodified celluloses for adsorbing cadmium (II) metal ion with the composition of modification. The modification processes of cellulose were done by the composition variation between cellulose and MBT of 1:1, 1:2, and 1:3. The adsorption process of metal ions by 2-mercaptobenzotiazole modified cellulose were done by shaking at pH 3, 4, 5, 6, 7, 8, and 9 with the effect of metal ions concentration of 0.05; 0.1; 0,15; 0,2, and 0,25 mg/L. The analysis of functional groups of cellulose-MBT and cellulose unmodified was using FTIR Spectrophotometer. The analysis of cadmium (II) concentration metal ions as cadmium metals were done by atomic absorption spectrophotometer (AAS). The result of this research showed that on the functional groups which derived from FTIR spectrum, there was some similarity of functional groups between unmodified cellulose and MBT-cellulose which could be seen from the wave length of C-S stretching at 663.51 cm-1; functional group of C-H aromatic stretching at 3749.62 cm-1; functional group of C-N at 1319.31 cm-1, and functional group of C=N that came from diazole functional group (-N=C-S) which could be seen at 1597.06 cm-1. The optimum adsorption metal ions cadmium by MBT-cellulose happened at 1:2 composition modification, pH 4, and at the concentration of 0.2 mg/L. Key words: adsorption, modified, cadmium (II) metal ion, cellulose, 2-merkaptobenzotiazole

Activity test of 2,6-bis-(2-furilidine) sikloheksanonecompound antibacterial towards resistence Staphyloccus aureus bacteria Ismi Rahmawati; Iswandi Iswandi; Sardjiman Sardjiman
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The data that have been obtained in Indonesia by using samples of clinical material from the hospital, Staphylocccus aureusis proved to be resistant to penicilin and methicillin, tetracyclin, oxacilin, gentamicin, erytromycin, chloramphenicol, and trimethrophrim-sulfemethoxazole. The high resistant inStaphylocccus aureus bacteria encourage efforts to find drugs that have antibacterial activity. Furfural and its derivates are known to have antibacterial activity. The purpose of this study was to obtain derivate of furfural compound 2,6-bis-(2’-furilidyn)-sikloheksanone, which is expected to have antibacterial activity against drug resistant bacteria Methicillin resistant Stapylococcus aureus (MRSA). 2,6-bis-(2’-furilidyn)-sikloheksanone synthesis was done with starting materials ofcyclohexanone (0,0121 mol)and furfural (0,0121 mol), using KOH 7,5% as catalys in the aquadest solvent. The purity test were carried out with melting distance test, thin layer chromatography, and gas chromatography. Structure elucidation was performed with mass spectrometer analysis, IR, and spectrophotometer, H1-NMR. The syntesis result is then tested for its antibacterial activity againts MRSA bacteria with diffusion method to determine the inhibition diameter. The result of this study showed that 2,6-bis-(2’-furilidyn)-cyclohexanone has been successfully synthesized with an average yield of 73,60% ±0,204. Re-crystallization resulting in pure compound base on its melting range (1,90C), TLC (one spot Rf= 0,33), and GC (100% area). The results of the chemical structure elucidation by mass spectrometry, IR spectrophotometerand H-NMR spectrometer line with the target compound. The synthesis result has antibacterial activity with average of inhibition diameter at a concentration of 3,959mM/ml= 27 mm. Keywords:synthesis, analog of curcumin, antibacterial

Estimating dynamic cattle population on palm oil plantation area in South Kalimantan Province) Adinata, Yudi; Pamungkas, Dicky; Krishna, Noor Hudhia; Aryogi, Aryogi
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Integration between beef cattle and palm oil plantation (animal plantation integration) should be supportedand developed. This study was carried out to estimate the dynamic cattle population managed by PT KAL.Estimating dynamic cattle population was counted by simulation base on population data, animal physiologicalstatus, and forage carrying capacity under palm oil plantation. The carrying capacity of available space is 2.066 ±199 animal unit (AU) and naturally would be reached in 2029-2030. Optimal capacity would be reached faster byintroducing new cattle in the population.Key words: integration, beef cattle, palm oil, dynamic cattle population

Formation of neural network models for time series data with intervention and its application in CPI data R. Kusumawati; D. U. Wutsqa; R. Subekti
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The purpose of this study is to get an optimal forecasting model of CPI data in Yogyakarta using neuralnetwork models that is built with the involvement of the intervention effect. This case happens because of the policyof rising fuel prices. CPI education, recreation, and sport have a pattern like a step function, so that the exact RNNmodels are the models with the input as the truncated polynomial spline regression models. The results of modelpredictions both training and testing data showed high accuracy. Key words: neural network, intervention, CPI

The usage of market vegetable waste in the production of electricity through microbial fuel cells Muhamad Imaduddin; Hermawan Hermawan; Hadiyan Hadiyan
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Keberadaan sampah sayur pasar begitu melimpah. Pemanfaatan sampah sayur salah satunya diolahmenjadi kompos. Hasil kompos mengalami kesulitan dalam pemasarannya sehingga hanya digunakan dalam skalakecil dan juga berdampak ke lingkungan seperti asidifikasi dan eutrofikasi. Di sisi lain, ancaman krisis energi danbahan bakar menjadikan kegiatan terkait dengan energi baru terbarukan menjadi sesuatu yang mendesak untuksegera dilakukan. Salah satu energi alternatif terbarukan ini adalah Microbial Fuel Cells . MFCs merupakan jenisutama dari bioelectrochemical system yang mengonversi biomassa secara spontan menjadi listrik melalui aktivitasmetabolisme mikroorganisme. Tujuan penelitian adalah menerapkan teknologi MFCs sebagai aplikasi sel voltadalam memproduksi listrik dengan substrat fase slurry sampah sayur. Variasi dilakukan pada perbandingan faseslurry yaitu 1:2; 1:1, dan 2:1 serta penambahan EM4. Pengoperasian reaktor dilakukan selama 21 hari. Voltaseyang dihasilkan paling besar pada reaktor R1+ (1:2 dan penambahan EM4) yaitu mencapai 1180 mV, arus listriksebesar 5,1 μA, dan daya listrik sebesar 6,02 mWatt, serta kerapatan daya sebesar 462,92 mWatt/m2. Keberadaanair pada MFCs berperan dalam mekanisme degradasi sampah sayur. Kecenderungan naiknya energi listrik yangdihasilkan pada awal pengoperasian reaktor menunjukkan adanya peningkatan sintesis seluler mikroorganisme.Penurunan energi listrik dipengaruhi pH lingkungan hidup mikroorganisme serta proses terbentuknya media lekatpada elektroda.Kata kunci: sampah sayur pasar, listrik, microbial fuel cells

The effects of giving “kecek”grasshopper(Orthoptera)stimulatorfrequencies of3000 Hz on teak (Tectona grandis)seeding and peanut(Arachis hypogeae, L) planting Anissa Yusi A’mallina; Juli Astono
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

The purpose of this research is to know the effects of giving “kecek”grasshopper(Orthoptera)frequencies of 3000Hz in teak (Tectona grandis) seedingand peanut (Arachis hypogeae, L) plantingtowards the growth, wide openingof stomata, and plant productivity. The sound that used in this research is sound of “kecek”grasshopper(Orthoptera) with peak frequencies of the original sound is (4.3 ± 0.6) 103Hz and peak frequencies ofthe manipulated sound is(3,010 ± 14) Hz. Objects of this research areteak (Tectona grandis) seeds and peanuts(Arachis hypogeae, L). The resultsof thisresearch include: plant height, stem diameter, leaf length, leaf width,number of leaf, and yield of mass analyze using Microsoft Excel and Microsoft Origin 6.1, while to determinetheopening width of stomataOptilab Image Raster program was used.The results showed that the growth,productivity, and stomata width aperture of treatment plants arebetter than the control plants.Keywords: sound of “kecek”grasshopper(Orthoptera), teak (Tectona grandis), peanut (Arachis hypogeae, L),stimulator frequencies

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