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Articles 200 Documents

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Magnetic Levitation for Diamagnetic Material Density Measurement: Theoretical Studies Gancang Saroja
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

A theoretical study was conducted to measure the density of diamagnetic materials using magnetic levitation method. In this study, cylindrical permanent magnet was used for generating a magnetic field gradient and a paramagnetic fluid as media of levitation. Both methods which using a single and double source were studied. The measureable parameter was the high of material levitation. The results showed that both methods can be used to measure the density of the diamagnetic sample.

Spread Indication of Underwater Surface Contaminants Using Magnetic Method (Case Study: TPA Supit Urang, Malang) Arif Rahman Hakim; Adi Susilo; Sukir Maryanto
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Research has been done on the spread of contaminants in the Supit Urang landfill, the city of Malang. The research was done in April 2013 - January 2014 in the area around Supit Urang landfill. The research purpose to determine the presence of contaminants in the Supit Urang landfill and distribution patterns. This research was begun by doing a data correction, consists of diurnal correction and IGRF correction so that got the total magnetic anomaly. Then, did reduction to the pole and upward continuation so that got the residual magnetic anomaly value ranging from -800 nT to 1100 nT. The results of data processing showed that contaminants in Supit Urang landfill accumulated on the inside of the landfill and then spreads in all directions with a depth of seepage reaches 25 meters. The spread of these contaminants are more inclined to the south because there is a river which is the discharge path of leachate from landfill to the river in the area. The results also showed the structure of the subsurface Supit Urang landfill dominated by sedimentary rocks such as sandstone, clay, tuff, tuff breccia and breccia. Based on the chemical test results, it showed contaminants in landfill is suspected to be leachate with susceptibility value between 0.0001 Wb/Am to 0.001 Wb/Am. Leachate from landfill contains some heavy metals with different concentrations, such as Cobalt (Co) 0.38 mg/L, Copper (Cu) 0.58 mg/L, Iron (Fe) 6.5 mg/L, Lead (Pb) 5.4 mg/L and Zinc (Zn) 4.8 mg/L.

The Combination Effect of Vitamin C and E on the Number of Hemoglobin, Leukocyte and Platelet Post-Irradiation of Gamma Ray Roni Prisyanto; Didik R Santoso; Unggul P Juswono; Yeni Cahyati
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Radiotherapy is an alternative treatment for cancer patients to inhibit and destroy cancer cells due to the ionization. Gamma rays ionize not only cancer cells but also damage healthy cells due to precence of free radicals produced by ionizing gamma rays when interacting with biological material. The decrease in blood cells as ie hemoglobin, leukocytes and platelets caused free radicals can be minimized by administering antioxidant vitamins C and E. This study was conducted to determine the effects of gamma radiation exposure to the decrease in hemoglobin blood cells, leukocytes and platelets of mice after administration of a combination of antioxidant vitamins C and E in five variations, namely 10 mg dose: 1μl, 15 mg: 1.5 μl, 20 mg: 2 μl, 25 mg: 2.5 μl, 30 mg: 3 μl. Exposure of gamma radiation was given fractionation ranging from 200 rads to 1000 rads. Blood was taken from the heart for hemoglobin, leukocytes and platelets tests. The results showed that the administration of vitamins C and E may reduce the decline in hemoglobin levels, leukocytes, platelets resulting from exposure to gamma radiation when compared to the control group or without vitamin.

Geographically Weighted Regression Modeling with Fixed Gaussian Kernel Weighted on Spatial Data (Case Study of Food Security in Tanah Laut District of South Kalimantan) Tutuk Munikah
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Geographically Weighted Regression (GWR) is a regression model that takes into account the spatial heterogeneity effect. In regression models, often there is a relationship between two or more predictor variables is called multicollinearity. Geographically Weighted Lasso (GWL) is a method used to overcome spatial and spatial heterogeneity of local multicollinearity. The purpose of this study establishes the model by using the method of GWL in the case of spatial heterogeneity and overcome local multicollinearity on the issue of food insecurity in Tanah Laut district. Generally, food insecurity in Tanah Laut district is affected by the percentage of the population without access to electricity, the average number of store/grocery shop, and percentage of children under five and maternal mortality. GWL models obtained in accordance with the number of observation locations. The results validate the secondary data showed that the model obtained in the study are in accordance with the actual conditions in the field. Models with fixed weighting Gaussian Kernel is able to predict the eight villages with food security conditions are the same as the secondary data.

Xanthone Content in Mangosteen Fruit Juice (Garcinia mangostana L.) and Inhibitory Effect of Mangosteen Fruit Juice on Enzyme Activity (alpha) -Glukosidase Maris Kurniawati; Chanif Mahdi; Aulanni’am Aulanni'am
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Glucosidase effects. This study aims to determine the effects of mangosteen rind juice inhibition against α-glucosidase enzyme activity and determine the levels of xanton in mangosteen rind juice. Measuring the level of xanton in mangosteen rind juice using High Performance Liquid Chromatography (HPLC). Enzyme inhibition assay against α-glucosidase activity performed in vitro. The research showed that Mangosteen rind juice samples had a retention time of 8.507 and xanton concentration in each mL juice mangosteen rind of 4.238 μg/mL or 385.272 μg/g juice mangosteen rind. The results showed that xanton in mangosteen rind juice can inhibit the activity of α-glucosidase enzyme. Based on the calculation of percent inhibition mangosteen rind juice against α-glucosidase enzyme activity by 64.71 %.

Determination of Polystyrene Layer Thickness and Zinc Phthalocyanine (Znpc) with Modified Sauerbrey Equations and Scanning Electron Microscope (SEM) Lalu A Didik; Eka Rahmawati; Fadli Robiandi; Susi Rahayu; Abdurrouf Abdurrouf; Djoko H. Santjojo; Setyawan P. Sakti; Masruroh Masruroh
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

The thickness measurement of PS thin films on QCM surface and ZnPc layer on QCM/PS using Sauerbrey equation and Scanning Electron Microscope (SEM) has been investigated. Calculation result using a modified Sauerbrey equation show the thickness of PS layer and ZnPc one are 0,45 μm and 0,0676 μm respectively. Additionally the thickness measurement by using SEM shows the thickness of PS layer is 5,33 μm and the thickness of ZnPc layer is 10,44 μm. The differences thickness between Sauerbrey equation and SEM topograph is due to layers porosity. The topography of thin films produced by the secondary electron beam scanning allows to get a magnification of SEM image so that it can be measured directly. While the thickness calculation using the Sauerbrey equation is based on the change in the resonance frequency of QCM.

Banana Fiber Composite (SBP) - Epoxy As A Sound Absorbent Material Khusnul Khotimah; Susilawati Susilawati; Harry Soeprianto
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

This research conducted to find the physical properties of the absorption of sound from banana stem fiber (Serat Batang Pisang / SBP) with epoxy matrix. The sound absorbent material made with a variety of different volume fraction composition. The comparison between the SBP and the volume fraction of the matrix is made of 30%: 70%, 40%: 60% and 50%: 50%. The method of research was done in three stages: making banana stem fiber, manufacturing composite and testing of composite SBP. Composite testing include physical properties (sound absorption). Preparation of the samples started by taking a banana stem, decomposition banana stem fiber, alkali treatment with NaOH 4%, then mixing the SBP with the epoxy matrix. Manufactured the composites by press the materials on the molding for 12 hours, then tested to find physical properties. Sound absorption test performed using a signal generator and a sound level meter with the principle of the impedance tube method through acoustic box approach as a reference. The results of the study showed that SBP with epoxy composites absorb up to 30% noise at 30% fiber volume fraction. Thus, SBP composites can absorb sound for low (f= 400 Hz) and medium frequency (f = 1000 Hz), based on the standard ISO 11654:1997 (E) where the minimum of sound absorption coefficient of acoustic materials is α = 0.15.

Effects of Polystyrene Solvent Difference on Morphology of Polystyrene Layers and Viscoelastic Properties of QCM Biosensors Susi Rahayu; Masruroh Masruroh; Djoko H Santjojo; Eka Rahmawati; Lalu A. Didik; Fadli Robiandi; Setyawan P Sakti
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

In this research, a modified QCM surface was done to improve the performance of QCM biosensors. This modification is done by coating polystyrene (Ps) on a QCM with toluena and chloroform solvents. The polystyrene coating was performed using spin coating technique, the measurement of surface roughness values using non-contact topography measurement system TMS 1200, and the viscoelastic properties was analyzed by using an electrical impedance. The analysis result using TMS 1200 shows morphologies of polystyrene produced with chloroform solvent have groovier and more porous compared to the toluena solvent. The roughness values of Ps surface with choroform and toluena is about 616.52 nm and 578.9 nm, respectively. The different surface roughness both of the solvent is caused by vapor pressure of each solvent. The vapor pressure value of chlorofrom solvent is 0.26 atm and toluena solvent of 0.037 atm. Moreover, using Sauerbrey equation is found mass of deposited ps produced with chloroform solvent is more than the toluena solvent. The mass of the polystyrene deposited on the surface of QCM with chloroform resulted about 2.23 × 10-5 ± 7.59 × 10-7 g and with toluena of 1.16 × 10-5 ±9.23 × 10-8 g. Furthermore, viscoelastic test show both polystirene layer are still rigid and have approximately 12.23 Ω impedance value. Therefore, the different solvents affect the surface morphologies of Ps.

Effects of Gamma Radiation Exposure and Giving of Green Bean Sprout Extract (Phaseoulus radiatus) to Gonad Animal Fertility Rate of Mice Feris Kamlasi; Unggul P. Juswono
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Gamma rays is an ionizing radiation that can causes infertilities.Cell defense mechanism against free radicals are involving active compound called antioxidant. Goal of this research is aim to analyze the influence of gamma radiation and review the influence of green beansprout extract (Phaseoulus radiatus) in gonad fertility rate with threevariables there are motility, viability and abnormality of spermatozoa. Male mice divided into three groups, control (K), non-extract radiation (RNE), and radiation plus extract (R+E).Mice was treated orally by green bean sprout extract with several dose 0.2 mL kg-1 body weight, 0.4 mL kg-1 body weight, 0.6 mL kg-1 body weight, 0.8 mL kg-1 body weight, and 1.0 mL kg-1 body weight. Radiation was given by fractionation starting from 100 rad, 150 rad, 200 rad, 250 rad, and 300 rad.The result shows that increasing radiation dose can reducing gonad fertility rate and treatment of Phaseoulus radiatus extract can suppress this reduction and preserve gonad fertility rate.

The Effect of Exposure to Gamma Radiation And Giving Extracts Of White Watermelon (Citrullus vulgaris Schrad) Part of Kidney Health In Animal Trying Mice Pujianti B. Donuata; Muhaimin Rifa'i; Unggul P. Juswono
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Cancer is a worldwide problem. People take medication in late stadium therefore radioteraphy plays important role in healing cancer. Side effect of cancer therapy such as cancers of urethra, colon, stomach or rectum may have bad influence for kidney which causes the decrease kidney function. Goal of this research is to understand the influence of gamma radiation on urine and kidney tubules necrosis. Mice assigned into two groups, which are extract and non-extract radiation groups. Each group has five variations of radiation doses, including 200rad, 250rad, 300rad, 350rad, and 400rad. White part extract of watermelon (Citrullus vulgaris Schrad) also used with five variations including 0.3mL, 0.6mL, 0.9mL and 1.2mL. Non-extract radiation group was only exposed to radiation without treatment with white part extract of watermelon. Profile of kidney health can be seen from the percentage of epithelium, erythrocyte and leukocyte after mice were put into metabolism cage for 24hours and percentage of kidney tubules necrosis observed under Microscope BX-51 and analyzed with Ms.Excel. Result of research concludes that gamma radiation increase epithelium, erythrocyte and leukocyte in urine, and kidney tubules necrosis. White part extract of watermelon can improve kidney health by reducing the percentage of epithelium, erythrocyte leukocyte and kidney tubules necrosis of mouse.

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