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Daerah istimewa yogyakarta
INDONESIA
Jurnal Sains Dasar
Published by Universitas Negeri Yogyakarta
ISSN : 20859872     EISSN : 24431273     DOI : 10.21831
Core Subject : Education,
Education
Arjuna Subject : -
Articles 237 Documents
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On the othogonal trajectories and conformal mapping of complex variable functions Kus Prihantoso Krisnawan; Atmini Dhoruri
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (311.404 KB) | DOI: 10.21831/jsd.v3i2.4110

Abstract

This research goal is to investigate the connection of orthogonal trajectories, analitic functions, and conformal mapping. Orthogonal trajectories are the intersection of two families of mutually perpendicular curves. The analytical property of a complex function f(z) = u + iv is investigated using Cauchy-Riemann conditions and then the geometric shapes of u and v are interpreted. The results showed that if two functions are mutually harmonic conjugate, then they are mutually orthogonal trajectories. If two families of curves of mutually orthogonal trajectories are mapped by conformal mapping then the result functions are also mutually orthogonal trajectories.Key words: orthogonal trajectories, analytic functions, conformal mapping
Test for diphenilphikril hydrazyl (DPPH) free antiradical from acetate etil extract of nangka leaf (Artocarpus heterophyllus Lamk) Nasution, Hasmalina; Nst, Musyirna Rahmah
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (152.128 KB) | DOI: 10.21831/jsd.v3i2.4111

Abstract

Senyawa antioksidan memiliki peran yang sangat penting dalam kesehatan. Berbagai bukti ilmiah menunjukkan bahwa senyawa antioksidan mengurangi resiko terhadap penyakit kronis seperti kanker dan penyakit jantung koroner. Karakter utama senyawa antioksidan adalah kemampuannya untuk menangkap radikal bebas. Senyawa antioksidan dari tumbuhan seperti vitamin C, vitamin E, karoten, asam-asam fenol, polifenol, dan flavonoid diketahui berpotensi mengurangi resiko penyakit degeneratif. Salah satu tanaman obat yang memiliki banyak khasiat adalah tanaman nangka (Artocarpus Heterophyllus lamk). Tanaman nangka telah diketahui secara empiris khasiatnya baik pada bagian daun, buah, biji buah, getah, dan kayu. Daun nangka dapat digunakan sebaga pelancar ASI, borok, dan luka. Selain itu, bioaktifnya berkhasiat sebagai antikanker, antivirus, dan antiinflamasi. Oleh karena faktor lingkungan seperti iklim, cuaca, dan lokasi tumbuh sangat berpengaruh terhadap komponen aktif suatu tumbuhan, maka pada penelitian ini telah dilakukan pengujian aktivitas antiradikal bebas DPPH terhadap daun nangka (Artocarpus Heterophyllus lamk) yang ada di Pekanbaru. Aktivitas Antioksidan ekstrak etil asetat daun nangka yang mengandung saponin dan steroid memiliki nilai IC50 (Inhibition Concentration) sebesar 778,76 ppm terhadap radikal DPPH. Kata kunci: daun nangka, ekstrak, etil asetat,  antioksidan, DPPH
Development of functional food product based on cassava (manihot esculenta) in supporting food resistence Herlina, Eka; Nuraeni, Farida
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.87 KB) | DOI: 10.21831/jsd.v3i2.4112

Abstract

Diversifikasi pangan merupakan salah satu cara memperkokoh ketahanan pangan. Ubi kayu dapat digunakan sebagai alternatif bahan baku sereal pengganti beras. Ubi kayu dapat digunakan sebagai bahan baku pangan fungsional, yaitu berupa flakes dengan kandungan antioksidan karena memiliki skopoletin, salah satu komponen bioaktif yang dapat mempunyai fungsi fisiologis bagi kesehatan. Penelitian ini dilakukan dengan mensubstitusi tepung ubi kayu pada pembuatan flakes ubi kayu menggunakan tepung kacang merah dengan berbagai perbandingan yaitu tepung ubi kayu: tepung kacang merah 5:0, 4:1, 3:2, 2:3, dan 1:4. Dalam penelitian ini juga dilakukan tahap perbaikan proses pembuatan tepung dengan melakukan heat shock sebelum penyawutan dan tahap selanjutnya analisis nilai gizi dari produk flakes yang dihasilkan antara lain protein, air, lemak, karbohidrat, serat kasar, vitamin A, vitamin E, dan vitamin C dan dilakukan uji DPPH untuk mengetahui aktivitas antioksidan serta dilakukan uji organoleptik yaitu uji hedonik untuk mengetahui kadar kesukaan konsumen terhadap produk yang dihasilkan. Dari analisis kimia produk flakes yang dihasilkan, ternyata substitusi tepung kacang merah dengan berbagai perbandingan seperti di atas meningkatkan kandungan vitamin C yaitu 0,337% (ubi kayu:kacang merah = 5:0); 0,421% (ubi kayu:kacang merah = 4:1); 0,511% (ubi kayu:kacang merah = 3:2); 0,594% (ubi kayu:tepung kacang merah = 2:3) dan 0,938% (tepung ubi kayu:tepung kacang merah = 1:4). Demikian juga kandungan protein meningkat dari 2,0560%; 3,0585%; 5,1568%; 6,9293%, dan 8,9874% sedangkan kenaikan kandungan lemak meningkat dari  7,7710%; 7,4141%; 9,9561%; 11,3675% dan 12,1673% untuk kandungan karbohidrat tertinggi pada perbandingan tepung ubi kayu:tepung kacang merah = 3:2 yaitu mencapai 51,1749%. Kandungan vitamin A mengalami penurunan dengan adanya substitusi kacang merah, kemudian naik lagi pada perbandingan tepung ubi kayu:tepung kacang merah = 3:2 yaitu mencapai 166 IU. Dari hasil uji hedonik didapat perbandingan tepung ubi kayu:tepung kacang merah = 3:2 menghasilkan produk flakes yang paling disukai baik dari segi aroma, warna, tekstur maupun rasanya.   Kata kunci: flakes
Identification of plankton species in ponds of Block O residence, Banguntapan, Bantul, Yogyakarta Sudarsono Sudarsono
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (327.82 KB) | DOI: 10.21831/jsd.v3i2.4140

Abstract

This research aims to identify the plankton species in the ponds of block O residence, Banguntapan, Bantul, Yogyakarta. The sample taken was accomplished by drawing 20 liters of water directly from the pond, then filtered it through the planktonnet. Field guide book of plankton identification was used to accomplish the next step, that is plankton species identification. The physicochemical condition, including temperature, turbidity, light intensity, and level of pH, were measured for every station given, and it was repeated 3 times. Shannon-Whiener equation was then used to calculate the index of diversity. This research concludes that the plankton species compositon of phytoplanton and zooplankton consist of 4 classes. They are Chlorophyceae (7 species), Cyanophyceae (7species), Bacillariophyceae (23 species), Euglenophyceae (4 species). From the total species of phytoplankton species found, around 54 species, at least 23 species are identified as the members of Bacillariophyceae, while the zooplanktons which were found in every stations consist of 4 classes, i.e. Copepod (1 species), Crustacean (2 species), Rotifer (5 species), and Protozoa (1 species). The total zooplankton species found is 10 species and 5 species of them belong to class Rotifer. The Diversity Indices on cathegoryzed in small to medium.   Key words: identification, plankton, Blok O.
The effect of voltage towards hydroxide magnesium yield through electrolysis system Fitria Fatichatul Hidayah
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (732.458 KB) | DOI: 10.21831/jsd.v3i2.4141

Abstract

Magnesium hidroksida mempunyai prospek dan manfaat sebagai bahan baku penyimpan gas hidrogen, bahan baku pembuatan magnesium oksida (MgO), dan obat maag. Magnesium dipisahkan berdasarkan metode elektrolisis. Hasilnya berupa magnesium hidroksida. Penelitian ini bertujuan untuk mengendapkan magnesium hidroksida melalui sistem elektrolisis dan menentukan pengaruh voltase terhadap rendemen hasil elektrolisis berupa Mg(OH)2. Sel elektrolisis terdiri dari 2-kompartemen, satu kompartemen berisi larutan Bittern di katoda dan kompartemen lain berisi larutan KOH pada anoda. Elektrolisis menggunakan tabung U yang disekat jembatan garam KCl, Elektroda berupa grafit dan potensial terpasang bervariasi mulai 3, 6, 9, dan 12 volt selama 120 menit. Magnesium hidroksida dikarakterisasi menggunakan spektrofotometer IR dan AAS. Penggunaan voltase terpasang 3 sampai 9 volt meningkatkan endapan Mg(OH)2 hasil elektrolisis tetapi pada voltase 12 volt terjadi penurunan endapan magnesium hidroksida.  Rendemen tertinggi yang dihasilkan pada penggunaan voltase sebesar 99,59%. Hasil analisis kadar Magnesium diperoleh 51,26%. Spektra IR Mg(OH)2 hasil elektrolisis dengan spektra IR Mg(OH)2 standar memiliki kemiripan bentuk spektra. Hal ini membuktikan bahwa endapan hasil elektrolisis merupakan Mg(OH)2. Kata kunci: voltase, bittern, elektrolisis, magnesium hidroksida
The potency of obtaining electrical energy from tofu industry liquid waste using salt bridge microbial fuel cell method Agustin Hermayanti; Irwan Nugraha
Jurnal Sains Dasar Vol 3, No 2 (2014): October 2014
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (242.079 KB) | DOI: 10.21831/jsd.v3i2.4142

Abstract

Research on the acquisition of electric energy from waste water industry has been known using the so called salt bridge microbial fuel cell (SBMFC) method. MFC system (microbial fuel cell) is applied to tofu liquid waste management industry which generates two benefits that is reducing contamination of organic material and producing electricity. This study focused on the dual-chamber MFC system that comes as a salt bridge proton exchanger. Variation of the concentration of KMnO4 as an electrolyte solution is done to observe the effects on the acquisition of electrical energy. Changes in pH, COD, and BOD were also conducted to determine the effectiveness of the MFC in degrading wastewater of tofu. The results obtained in the form of electrical energy with a maximum power density of 11,941 mW/cm2 at concentration of 0.10 M. The pH value increase of KMnO4 occurred from 3.5 to 4.0 at concentration of 0.05 M KMnO4. Meanwhile the greatest decreases in COD values are 42.86% and 71.27%, respectively, at KMnO4 concentration of 0.10 M.   Key words: microbial fuel cell, dual-chamber, power density, electrical energy
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (965.166 KB) | DOI: 10.21831/jsd.v3i2.4143

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3188.871 KB) | DOI: 10.21831/jsd.v3i2.4144

Abstract

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
Temperature effect on hidration reaction of α-pinene to α-terpineol catalyzed by activated nature zeolite) Nia Amilia; Kusoro Siadi; Latifah Latifah
Jurnal Sains Dasar Vol 2, No 2 (2013): October 2013
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (999.656 KB) | DOI: 10.21831/jsd.v2i2.4163

Abstract

system over activated nature zeolite has been conducted. The purposes of the research are toknow the best temperature of hydration reaction α-pinene to α-terpineol using activated naturezeolite and to determine the value of activation energy for the hydration reaction. Characterizationof the catalyst include surface area, pore size, and pore volume was performed using GasSorption Analyzer NOVA1200e. Reaction occurs at various temperature of 30, 40, 50, 60, 70, and80oC. The product of reaction is analyzed using infra red spectroscopy, gas chromatography, andchromatography-mass spectroscopy for the best product. Results of the analysis using infra redshow absorption of OH group at 3400cm-1, C-H at 2987,09cm-1, C=C bond at 1635,64cm-1, andC-O at 1126,43 cm-1. Effect of increasing temperature influences the convertion (%) α-pinene toα-terpineol. The best result was reached at 70oC for 68.53% and the activation energy of reactionhydration is 69.6546 kJmol-1.Key words: α-pinene, temperature, hydration reaction, α-terpineol
Personal health behavior profile of biology and biology education students in Yogyakarta State University Siti Mariyam; Kartika Ratna Pertiwi
Jurnal Sains Dasar Vol 2, No 2 (2013): October 2013
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (50.756 KB) | DOI: 10.21831/jsd.v2i2.4164

Abstract

Kegiatan penelitian ini bertujuan untuk mengetahui: (1) perbedaan status personal healthbehavior antara mahasiswa Jurusan Pendidikan Biologi pria dan wanita, (2) perbedaan statuspersonal health behavior antara mahasiswa prodi Pendidikan Biologi dan Biologi, dan (3) faktorfaktorpendukung dan penghambat apa sajakah yang mewarnai personal health behaviormahasiswa Jurusan Pendidikan Biologi.Penelitian ini merupakan penelitian Survei Analitik model Cross Sectional. Penelitimencoba menggali bagaimana dan mengapa fenomena kesehatan masyarakat itu terjadi denganpendekatan point time approach. Berdasar batasan tersebut maka penelitian ini berusahamenggali fenomena Personal Health Behavior mahasiswa Jurusan Pendidikan Biologi FMIPAUniversitas Negeri Yogyakarta, baik prodi Biologi maupun Pendidikan Biologi. Berdasarkan skoryang diperoleh melaui pengisian Personal Health Inventory, dapat ditentukan tingkat perilakukesehatan responden atau status risiko kesehatan mereka. Selain hal tersebut juga dilacakfaktor-faktor yang mewarnai Personal Health Behavior responden untuk melihat keterkaitan antarfaktor maupun faktor penentu utama terhadap tingkat perilaku kesehatan responden. Sebagaicontoh, keterkaitan antara faktor individu, faktor lingkungan intrinsik dengan ekstrinsik, sertafaktor predisposisi dan predileksi terhadap profil perilaku kesehatan responden.Dalam penelitian ini dapat ditarik beberapa simpulan : (1) tidak ada perbedaan status PHBantara mahasiswa Jurusan Pendidikan Biologi pria dan wanita, sebagian besar mereka berisikosedang, (2) tidak ada perbedaan status PHB antara mahasiswa program studi Pendidikan Biologi Biologi sebagian besar mereka berisiko sedang, dan (3) Faktor-faktor yang mewarnai PHBmahasiswa Jurusan Pendidikan Biologi meliputi riwayat kesehatan, pola asuh, dan psikososial.Kata kunci: Personal Health Behavior, Personal Health Inventory

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