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INDONESIA
Jurnal Biofisika
Published by Institut Pertanian Bogor
ISSN : 18296009     EISSN : -     DOI : -
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology
Jurnal Biofisika terbit 2 kali dalam setahun. Dikelola oleh Departemen Fisika, Institut Pertanian Bogor.
Arjuna Subject : -
Articles 31 Documents
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SEL SURYA HIBRID BULK HETEROJUNCTION NANOPARTIKEL ZnO/Cu-FEOFITIN . Sugianto
Jurnal Biofisika Vol. 9 No. 2 (2013): Jurnal Biofisika
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Abstract

The  hybdrid  solar  cell  in  bulk-heterojunction  form  has  been  fabricated.  It  was combined among ZnO and chlorophyll derivatives (Cu-Pheophytin) and insertion of CuSCN layer as  hole conductor. The hybrid film of ZnO/Cu-pheophytin  has a wide absorption spectrum  compare with the  ZnO  film alone. The  characterization result of the  hybrid  film  of  ZnO/Cu-pheophytin  solar  cell  has  fill  factor  about  55%  which indicated an ideal  curve  of  I-V characteristic. Moreover, the  conversion  efficiency  of the cell was 0.3%.
X-RAY RADIOGRAPHIC STUDY OF β-TRICALCIUM PHOSPHATE BIOCERAMICS AS A TOOTH FILLER N.A. Nuzulia
Jurnal Biofisika Vol. 9 No. 2 (2013): Jurnal Biofisika
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Abstract

Preservation of alveolar bone following tooth extraction is an  important step in dental practices before dental implant placement. This study reported the use of β-TCP as a tooth filler to maintain the desired alveolar ridge dimension and stimulate the bone healing processes in the area of tooth loss. The β-TCP used in this study is pure β-TCP made of chicken eggshells. The corresponding β-TCP was mixed with chitosan 2% to get β-TCP pellet for biocompatibility testing. Biocompatibility testing of β-TCP on  lower  incisor  was  performed  in  rabbits  and  sheep  as  animal  model.  Animal models  (rabbits  and  sheep)  implanted  with  β-TCP  demonstrated  the  expected results. The x-ray radiograph of rabbit’s jaw showed the formation of complete tooth and tooth growth at D+30 PO on alveolar socket. Moreover, the x-ray radiographs of sheep’s  jaw  indicated  no  change  on  mesiodistal  of  the  edentulous  area.  It  was obvious  that  the  corresponding  β-TCP  could  accelerate  the  formation  of  complete tooth on rabbit, minimize the postextraction bone loss and maintain the alveolar ridge dimension on sheep.
UJI SIFAT ELEKTRONIK FILM Bax Sr1-xTiO3 DENGAN METODE WERNER Endang Rancasa
Jurnal Biofisika Vol. 9 No. 2 (2013): Jurnal Biofisika
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Abstract

In  this  study,  BaxSr1-xTiO3(BST)  films  were  grown  on  p-silicon  substrates  using chemical solution deposition (CSD) and were annealed at 850oC for 15 hours.  Then contact were made on its. Measurement of electrical properties has been observed using sourcemeter and then its were analyzed using werner method to extract seriesresistance and  ideality factor.  Then  value  of series  resistance  w as used  to  correct voltage data Vd. Then graphs of Vd – Ln I were analyzed to extract saturation current, barrier  potential  and  ideality  factor.  The  increasing  of  mol  fraction  of  Ba  caused increasing in saturation current and reduces value of series resistance, ideality factor and barrier potential.
STUDI ELEKTROKIMIA POLIANILIN KOMPOSIT ELEKTRODA PASTA KARBON , Suriyanti
Jurnal Biofisika Vol. 9 No. 2 (2013): Jurnal Biofisika
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Abstract

Polyaniline  is  widely  used  as  a  material  for  manufacturing  electrodes  such  as biosensor,  biofuel  cell,  and  supercapacitor  application  in  nanocomposite  forms.  In this study, polyaniline has been synthesized in emeraldyne salt forms by  interfacial polymerization  method  and  synthesized  nanocomposite  electrode  of  polyanilinecarbon paste. The polyaniline morphology was characterized by X  -  Ray Diffraction (XRD ) , Scanning Electron Microscopy ( SEM ), Transmission Electron Microscope (TEM)  and  Fourier  Transform  Infrared  (FTIR).  In  XRD  pattern  showed crystal type was  polyaniline  nanofiber  semicrystalline.  The  SEM  image  showed  polyaniline morphology  which  nanoparticle  formed.  The  TEM  result  estabilished  nano-size indicated  by  diameter  size  about  60 -80  nm,  FTIR  result  showed  that  polyaniline which synthesized was conductive polyaniline forms or called emeraldine salt (ES). Electrochemical  studies  showed  that  nanocomposite electrode of polyaniline-carbon paste  be  able  to  increased  the  ion  transfer  efficiency  in  the  composite  electrode. Voltammograms  of  nanocomposite  electrode  of  polyaniline-carbon  paste  seen  at  a potential  0,5V  aniline  oxidation  peaks  and  reduction  peaks  seen  at  -0.1  V  Both  of these curves peaks (oxidation and reduction was not observed clearly).
APLIKASI NOZEL PADA DUA VARIETAS KENTANG UNTUK PRODUKSI BENIH SECARA AEROPONIK Eni sumarni
Jurnal Biofisika Vol. 10 No. 1 (2014): Jurnal Biofisika
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Abstract

Seed is a major problem for potato growers in Indonesia. Therefore, the acceleration of seed potato production is needed to reduce dependence on imports. One of the important things in the aeroponic system is a good oxygenation of each grain fog nutrient solution to the plant roots. The purpose of this study is to get a good nozzle type on nutrition aeroponic system. Seed potatoes used are varieties of Granola and Atlantic. Factors tested: type of nozzle (N) : N1 (spray jet blue : 55 lt/ h, beam diameter (d): 2,4 m), N2 (green jet spray : 90 lt/h, d : 3,2 m), N3 (microsprays black yellow : 70 lt/h, d: 1 m). Research using a randomized block design with three replications. Analysis of the data using analysis of variance followed by Duncan's multiple range test at level 5 %. The results showed that the use of a good nozzle on aeroponics system is the specification 55 l/h nozzle, d: 2,4 m and 90 lt/h, d: 3,2 m. Microsprayer with specification of 70 llt/h, d: 1 m is less suitable because it has less spread bursts specification. Varieties of potato plants that provide both growth and yield up to 65 days after planting is Granola.
SINTESIS DAN KARAKTERISTIK MEMBRAN NILON YANG BERASAL DARI LIMBAH BENANG Epa Rosidah Apipah
Jurnal Biofisika Vol. 10 No. 1 (2014): Jurnal Biofisika
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Abstract

Recently, the technology of membrane is developed directly. Many attractive things of membrane is able to be studied, therefore many ideas emerged on the aspect of synthetic membrane fabrication from many materials, furthermore it is able to used substituting for the function of natural membrane. The purpose of this study are able to know and study the influence of the TiO2 additional on the compounds of the nylon thread in market and on the characteristic of electricity and mechanics. The membrane was fabricated by a phase inversion method on weight variation. The characterizations were done which were the characteristic of electricity (impedance, capacitance, conductance and loss coefficient), the characteristic of mechanics (compression and attraction) and the analysis of on the compounds of the nylon membrane using FTIR. The most optimum characteristic of mechanics are the membrane with nylon weight of 3.5 g and 6.0 g, furthermore from the mechanics characteric was treated the TiO2 dopping. the compounds of the nylon membrane was observed by using FTIR which showed that exist PO4 in the natural membrane and the TiO2 dopped membrane
KARAKTERISTIK FLUKS MEMBRAN DALAM PROSES FILTRASI LIMBAH CAIR INDUSTRI PELAPISAN LOGAM Fifia Zulfi
Jurnal Biofisika Vol. 10 No. 1 (2014): Jurnal Biofisika
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Abstract

Environmental pollution that caused by electroplating wastewater can be solved by membrane technology. Chitosan and silica have been used widely in the wastewater treatment process and also easily formed into membranes. The purpose of this study is to analyze characteristics of membrane flux , which is one indicator of the quality of the performance of the membrane. The membranes used in the filtration process is made of chitosan and silica rice husk ( biosilika ) with inverse phase technique. Variations in the mass ratio of chitosan and biosilika are 1, 1.5, 2, and 3 for membrane A, B, C, and D respectively. The results of  flux  showed that the membrane flux decreased exponentially with increasing time. Flux caharcteristics of membrane B is better  than others because the average flux and porosity in the electroplating wastewater filtration is higher than the others, namely 19115.62 L/m2hours and 87.79 % respectively. The mechanism of membrane fouling on chitosan - biosilika has caused by  blocking of a number of membrane pores is described by  curves fitting of flux decline to  the experimental data.
OPTIMASI SERAT KENAF SEBAGAI FILLER BIOKOMPOSIT DENGAN ADITIF SERBUK DAUN TEMBAKAU PADA APLIKASI PAPAN GIPSUM PLAFON Vina Fauziah
Jurnal Biofisika Vol. 10 No. 1 (2014): Jurnal Biofisika
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Abstract

Synthesis and characterization of biocomposite gypsum board ceiling based on kenaf fiber has been performed compression molding method with variation of woven and uniform filler.  The optimum fiber concentration on the fiber are woven with 10 % kenaf fiber, 88 % matrixes gypsum, 1 % PVA (Polivinil Alcohol) and tobacco. The test resulted that the hardness and impact mechanical of the resulted product was higher than the commercial gypsum. The highest absorption of gypsum board is 25 % owned by fiber glass composite, on biocomposite with addition of tobbaco is 21 % and the lowest is 13 % on biocomposite without addition of tobbaco. The highest value on thickness development is 1.85 % owned by fiber glass composite. On biocomposite with addition of tobbaco is 1.73 % and the lowest is  0.4 % on biocomposite without addition of tobbaco. Density of biocomposite is 1.6 g cm-3, whereas density of fiber glass composite is 1.98 g cm-3. The test result showed that the kenaf’s fiber and tobbaco leaf powder is reliable to use as the filling material for the the gypsum plafon.
SIMULASI LAJU PENURUNAN GLUKOSA DARAH DIABETES TIPE 1 SETELAH MELAKUKAN AKTIVITAS FISIK Muhammad Khalid
Jurnal Biofisika Vol. 10 No. 1 (2014): Jurnal Biofisika
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Abstract

Decline rate modeling of blood glucose in type 1 diabetes after exercise that made by Roy2 not attach consumption glucose factor. In the fact, type 1 diabetes mellitus (T1DM) consume the glucose before exercise. Consumption of glucose can from food or drinks. In the research, we modify Roy’s2 model by attached glucose consumption. Result of modification model isn’t too different to experiment data. This is evident from R2 value obtained for 99.30%. In addition, this modification result isn’t much different with Anirban Roy’s model that have R2 value is 99.25%. Parameter values used for this model modification it’s identic, they are insulin injection (u1) is 15 µU min-1, exercise duration is 60 minute, patient boddy mass is 80 kg, and glucose consumption (D) is around to 10 mg min-1 dl-1 (for parameter values in modification model). Hypoglycemia will occur if amount of insulin injected into patient too much, while hyperglycemia can occur if amount of insulin injected into patient too little.
SIMULASI DOCKING KURKUMIN ENOL, BISDEMETOKSIKURKUMIN DAN ANALOGNYA SEBAGAI INHIBITOR ENZIM12-LIPOKSIGENASE Gita Syahputra
Jurnal Biofisika Vol. 10 No. 1 (2014): Jurnal Biofisika
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Abstract

Docking simulations of curcumin and its analogs have been conducted on 12-Lipoxygenase receptor enzyme. Semi-flexibledocking simulation has been performed using AutoDock Vina.This research is aimed to find the most stable compounds of curcumin that bind with 12-Lipoxygenase enzyme. Ligands used in this research consist of enol curcumin, bisdemetoxycurcumin, and two analogs (analog A and B). Gibbs free energy and the type of chemical bonding and binding sites of ligand-receptor docking aresome of the results discussed in this paper. All.simulation results of curcumin and its analogs have shown lower binding affinitycompared to arachidonate acid (natural ligand of 12-Lipoxygenase)  and ibuprofen which act as competitive inhibitors.Enol curcumin has been found tohave the best score of Gibbs free energy ∆G = -8.4 kcal/mol. Overall curcumin and its analogs have shown potential as stable Inhibitors for 12-Lipoxygenase and able to block the production of Leukotrien and 12-HETE which responsible for inflammation.

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