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Articles 200 Documents

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Electrical Impedance Value Analysis on Formalinized Tilapia Fish Meat Putri, Rizka Rahmatie Agusta; Widodo, Chomsin Sulistya; Santoso, Didik Rahadi
Natural B, Journal of Health and Environmental Sciences Vol 3, No 4 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

Electrical impedance can be used as a non-destructive method to determine the bio-electrical characteristics on biological materials. Analysis of the electrical impedance value by using an electrode needle method has been applied to the tilapia flesh which aims to determine the bio-electrical characteristics on tilapia flesh, and determine the effect of formalin on it. The measurements were carried out to compare the characteristics of bio-electrical characteristics of the fresh tilapia flesh, the tilapia flesh soaked in formalin, and the one that was lay without any preservation treatment at a 10 Hz - 200 kHz frequency. The result shows that the impedance value characteristics of the fresh tilapia flesh decreased as long as the increase of frequency. Both the preserved and the rotten tilapia flesh have the decreased impedance value. The concentration of formalin immersion is directly proportional with the value of electrical impedance.Â Â

Potential of Sugar Cane As an Alternative Raw Material for Making Activated Carbons A.S. Dwi Saptati Nur Hidayati; Silva Kurniawan; Nalita Widya Restu; Bambang Ismuyanto
Natural B, Journal of Health and Environmental Sciences Vol 3, No 4 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

This research studied to utilize the bagasse to be used as activated karbon in particular for the adsorption of Ca2+. The manufacture of activated carbon consists of carbonization dan activation process. Temperature variation for carbonization process in this research are 500°C, 550°C, 600°C, 650°C and 700°C then proceed with the activation process by carbon reflux with 6 M H2SO4 for 4 hours. Carbonization yield will decrease with increasing temperature carbonization. While the ash content, surface area, pore volume, and adsorption capacity of Ca2+ will increase with increasing temperature of carbonization. Obtained activated carbon is best activated karbon made at a temperature of 700°C with an activation carbonization which has a surface area 100.62 m2/g, 22.3750 Å pore diameter, pore volume of 22.376 mL/g, can eliminate the Ca2+ up to 13.26 %.

Invasive Foreign Vegetation Analysis on Forest Revitalization Area Block Argowulan National Park Bromo Tengger Semeru National Park Zulharman Zulharman
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

The aim of the research was to identify the invasive alien plant species and the pattern of the spread and diversity of invasive alien plants in the area of revitalization forest Block Argowulan Bromo Tengger Semeru National Park. This research was conducted in the area of revitalization forest Block Argowulan, Mount Penanjakan Bromo Tengger Semeru National Park (TNBTS) Malang, was from June 2014 through February 2015 by using sampling vegetation analysis method. The invasive alien plant species were found such as Ageratina riparia, Acacia decurrens, Tithonia diversifolia and Imperata cylindrica with the pattern of spread of clumped (clumped) and the Diversity variety, the type that was able to change the ecosystem, namely Acacia decurrens and Imperata cylindrica, because contained residues which capable of causing other plants can not grow. The strongest association of Acacia decurrens was with Ageratina riparia, indicated by Ochiai index of 0.03; Dice index of 0.23; Jaccard index and 0.30 index value close to 1.

Analysis of Potential Differential Characteristics of Albumin Membranes and Vitelin Membranes Quail Eggs (Cortunix cortunix) Due to Hydrogen Peroxide Fluid Ummu Hidayati Mardiyah; Didik Rahadi Santoso; Unggul Pundjung Juswono
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

The research of analysis the potential difference characteristic of albumin and vitelline membranes quail egg (Coturnix Coturnix) due to contaminated by hydrogen peroxide (H 2 O 2 ) was conducted to determine the effect of hydrogen peroxide (toxic) against the resistance of a cell. Hydrogen peroxide (H 2 O 2 ) is one group of reactive oxygen species (ROS) that can damage lipids, proteins and nucleic acids because they can diffuseion freely passed by bilayer membrane, so that the hydrogen peroxide concentration needs to be controlled. The resistance of a cell can be determined from changes in the value of the measured membrane potential. The method used in the research applied a microelectrode connected with unity gain differential amplifier and PicoScope. The measurement results show that there is a change the potential difference at the albumin membrane and vitellin membrane of quail egg due to contaminated hydrogen peroxide (H 2 O 2 ). The highest value of the membrane potential difference in the concentration 0 ppm at the albumin membrane is (-144 ± 2 mV) and the vitelline membrane is (-172 ± 3 mV), while the lowest value of the potential difference in the concentration 4000 ppm is (-8 ± 2 mV) at the albumin membrane and (-18 ± 1 mV) at the vitellin membrane.

The effectiveness study of SnCl2.2H2O masking on the formation of QCM profile using wet etching technique with KOH solution Tri Andi Rusly; D.J. Djoko H. Santjojo; Setyawan P. Sakti; Masruroh Masruroh
Natural B, Journal of Health and Environmental Sciences Vol 4, No 2 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

SnCl2.2H2O has been successfully utilized to produce isotropic profile on the surface of a SiO2 crystall by a wet etching procces. The etching process was carried out by using a 40% KOH solution. In this research, the wet etching method is carried out by optimizing the etch time which was varied for 0,5 hour, 1 hour, 1,5 hour. The profile was determined by applying a SnCl2.2H2O on the surface of a QCM. The mask was applied by using a spray coating technique. The SnCl2.2H2O material was chosen as the masking material because it has a high adhesive property to SiO2, does not react to the KOH etching solution and is corrosion resistance as well as low cost. The etching profile surface results and etch depth (Dz) were determined using topography measurement system (TMS 1200). The etching rate with 40% KOH during etching time of 30 minutes, 60 minutes, 90 minutes were 4.36 μm, 4.56 μm and 5.79 μm respectively. The optimum QCM surface isotropic profile was obtained at the etching rate of 4.56 μm / h by 60 minutes etching.

Fourier Integral Implementation to Obtain the Velocity Signal and Displacement Signal from Digital Data of MEMS Accelerometer Sensor Wasis Wasis
Natural B, Journal of Health and Environmental Sciences Vol 4, No 3 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

This paper discusses and implements a simple technique to obtain the velocity and the displacement signals from the digital data of the MEMS accelerometer sensor, which is an acceleration signal. The method used is a numerical integral, i.e. discrete Fourier integral. Technically, the digital signal data from the MEMS accelerometer sensor is converted from time domain to frequency domain by using Discrete Fourier Transform (DFT). In the frequency domain, the acceleration signal component is integrated once to obtain its velocity components, and is integrated twice to obtain its displacement component. Furthermore, Invers Discrete Fourier Transform (IDFT) is performed to obtain the form of velocity and displacement signals in time domain. The application of these theories and methods gives quite good results, especially for low frequency signals recorded at high sampling rates.

Determination of Wurung Crater Surface Temperature - Ijen East Java Using Landsat Image 8 as A Preliminary Study In the Geothermal Exploration Survey Surya Aji Ermanto; Sukir Maryanto; Adi Susilo
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

Has conducted research using remote sensing methods being located in the mountain complex Ijen, Bondowoso - Banyuwangi, East Java as preliminary data to assist in the design of geothermal exploration survey. Remote sensing data used are images from Landsat 8. Landsat 8 infrared thermal image is processed as land surface temperature data. Processing land surface temperature using a single band. Methods in this study begins with finding NDVI (Normal Differential Vegetation Index), which is the value used to state how dense vegetation in an area. After it obtained the value of the fraction of vegetation and emissivity of land used for the determination of the distribution of land surface temperatures. The surface temperature of this land will be used as a guide in making the design of a geophysical survey in geothermal exploration further. Because geothermal areas associated with land surface temperatures were relatively high. Based on the results of data processing of remote sensing, land surface temperatures were relatively high in the area around the Kawah Wurung and Girimulyo that has a land surface temperature ranges between 3060ºC.

Accuracy Evaluation Activities Tc-99m in Single Organ and All Organ using Gamma Camera Mediso AnyScan Dual Head S and Anthropomorphic Phantom Diah Shanti Utaminingtyas; Johan A. E. Noor; Nur Rahmah Hidayati
Natural B, Journal of Health and Environmental Sciences Vol 3, No 3 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

In term of nuclear medical, Radiopharmaceuticals with Tc - 99m radioisotope for kidney examination inserted into the body will emit gamma radiation that can be detected by a gamma camera. Gamma camera will display the distribution of radioisotopes in the patient's body and measure examined organ function in the form of image. A committee in nuclear medical developed Medical Internal Radiation Dosimetry (MIRD) method, the standard method on the way calculating activities in organ by image quantification. Differences in the activity of Tc-99m were measured by a dose calibrator with detected activity of organs to determine the accuracy of activity measurement. These results indicated that detected activity in the organ, calculated by the method MIRD, were smaller than the calibrator measurement result. The differences percentage in the activity of a single organ (counting each organ), involving all organs (enumeration simultaneously including kidney, bladder, heart and liver), has value <20% that indicate the reliability of MIRD method to use in internal dosimetry.

Effects of Quadrifide Sterculia R. Br Extract on Potential of Membrane of Oreochromis Niloticus Egg Cell Resulting from Pb Contamination Fetronela Rambu Bobu; Chomsin Sulistya Widodo; Johan Andoyo Effendi Noor
Natural B, Journal of Health and Environmental Sciences Vol 3, No 4 (2016)
Publisher : Natural B, Journal of Health and Environmental Sciences

The effect of faloak (Sterculia quadrifida R.Br.) extract to the cell membrane potentials of tilapia (Oreochromis nilaticus) egg in contaminated water lead was studied. The cell membrane potential of tilapia egg was measured by a microelectrode connected to a Picoscope. The result showed that increasing of the Pb consentration caused decreasly of the membrane potential. Faloak extraction in contaminated water raised the membrane potential value. The concentration of faloak extract with the impact of raising the cell membrane potential of tilapia egg that have been contaminated by Pb is 0,8 mg. It seems that the antioxidant of faloak extract can reduce pollution rate.

Development of Multiphase Diffraction Pattern Analysis Technique with Rietveld Refinement Method: PZT Thin Case Study Rizky Arief Shobirin; Masruroh Masruroh; Rachmat Triandi Tjahjanto
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

In this research has been developed multifasa diffraction pattern analysis technique with rietveld refinement method with case study of application of the technique on thin layer of PZT (PbZrxTi (1-x) O3) which has been synthesized with variation of 1, 2, and 3 hour annealing time. This interpretation technique begins with the determination of the background, then performed refinement parameter determinant of pattern change, peak shape, and intensity of diffraction. The parameters are, respectively, scaling factor, 2θzero, lattice parameter, gaussian peak shape constant, and gaussian-lorentzian, atomic position coordinates, and preferred orientation. The refinement results show that changes in peak shape constant give significant changes in residual values, whereas atomic and preferred orientation changes do not provide significant change in residual values.

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