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Natural B
Published by Universitas Brawijaya
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Environmental Science
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Articles 14 Documents
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Search results for , issue "Vol 1, No 2 (2011)" : 14 Documents clear
Study of Adsorption and Desorption on Gold Metals by Biomass Saccharomyces cerevisiae. Thermodynamic Review Masruroh Masruroh; Lailatin Nuriyah; Siti Jazimah Iswarin; Eka Rahmawati
Natural B, Journal of Health and Environmental Sciences Vol 1, No 2 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (55.194 KB) | DOI: 10.21776/ub.natural-b.2011.001.02.11

Abstract

A Study on biosorption of gold solution (Au) by Saccharomyces cerevisiae has been caried out. These studies included determination of optimum pH, optimum Au solution concentration,  isotherm and biosorption capacity based on termodinamycs theory, and mechanims of interaction between Au ion and Saccharomyces cerevisiae biosorben. Mechanisms of interaction were known with Au ion on Saccharomyces cerevisiae biosorben using aquadest and 1 M HCl. The result showed that the optimum adsorption process of Au solution by Saccharomyces cerevisiae biosorben took place on pH 5, adsorbat concetration of 100 mg/L was 2.2321 mg/g of yeast. The adsorption isoterm followed the Langmuir adsorption with regresion value of 0.8550 (R2= 0.8550), that indicates that the chemisorption process occurred on the first monolayer on the adsorbent surface. From the thermodynamics theory gives Gibbs free energy of the process a value of ΔG = -0.09195 kJ/mol and showing spontaneous physisorption process. The number of Au ion desorption by using HCL was 73.98%, whereas by using aquades it was 35.42%. It indicated that the main interaction between Saccharomyces cerevisiae biosorben and Au ion was chemisorption.
Geoelectrical Tomography of Cangar Hot Springs Area, Arjuno-Welirang Complex Stone Fajar Rakhmanto; Sukir Maryanto; Adi Susilo
Natural B, Journal of Health and Environmental Sciences Vol 1, No 2 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8.925 KB) | DOI: 10.21776/ub.natural-b.2011.001.02.14

Abstract

Have been research geothermal of Arjuno Welirang area of East Java with geoelectric resitivity tomography. Geoelectric tomography was performed by VES (Vertical Electrical Sonding) and Mapping. Acquisition of data totaled 7 points of VES and 4 tracks Mapping was located surrounding the hot springs.Results of geoelectric resistivity modeling showed the resistivity of rock layers the carrier fluid (water) heat <10 Ohm.meter, while a layer of carrier fluid (water) was worth 10-100 Ohm.meter. The hot fluid coming from the direction of CR4 and CR3 are located in the south from the hot springs with a depth of 24.7 meters from the ground CR 3 (see Figure 5) which alleged a layer of sand, with layers of lava rock in the form of heat source at depth 34 meters. Mapping the results of modeling that consists of 4 tracks show around hot springs artifacts crack / crack is suspected as a medium to hot water flow out of the ground surface, precisely located at CANGAR_LINE1.
Study of Plastic Making on Polyblend Methylacrylate-Starch Istiroyah Istiroyah; Lailatin Nuriyah; N. Ardian P
Natural B, Journal of Health and Environmental Sciences Vol 1, No 2 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9.486 KB) | DOI: 10.21776/ub.natural-b.2011.001.02.12

Abstract

The aims of the research were to make biodegradable plastics starch-methyl acrylate. FTIR spectra showed that polymerization of 100 grams of starch with 2 L of water at 95ºC and added by 150 grams of methyl acrylate at 40-45ºC with ceric ammonium nitrate as catalyst, produced polyblend plastics. Tensile strength of plastics depends on starch type. Biodegradable plastics with starch that have high amylase concentration showed high tensile strength. Plastic sweet potato starch had maximum tensil strength at 18.6±4.4 Mpa while maximum elongation at bread was at 25.33±6.29% from plastic madeform corn strach.
Yogurt Supplementation In Rats (Rattus Norvegicus) Foods Affected by Formaldehyde Exposure to Enzymatic Antioxidant Activity at Hepar tissue Chanif Mahdi; Aulanniam Aulanniam
Natural B, Journal of Health and Environmental Sciences Vol 1, No 2 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9.793 KB) | DOI: 10.21776/ub.natural-b.2011.001.02.13

Abstract

Yogurt or yogurt is fermented milk products are rich in various vitamins and amino acids, has potential as a potential source of exogenous antioxidants. Formaldehyde is an organic compound or the aldehyde group of the most simple alkanal are toxic and carcinogenic, presenting  in the body can act as a source of compounds reactive oxygen species (ROS) and free radicals that damage cells and tissues are organs. The purpose of this study was to determine the effects of formaldehyde as a toxic compound, and yogurt as detoksikan of antioxidant activity in this regard is the enzymatic antioxidant activity superoksid dismutase (SOD) and levels of reduced glutathione (GSH). The results showed that exposure to various doses of formaldehyde in food rat (Rattus norvegicus) respectively is 0 ppm, 25 ppm 50 ppm 75 ppm and 100 ppm is very real effect (P <0.01) toward decreased antioxidant enzymatic activity in this regard is the reduction of activity superoksid dismutase (SOD) and GSH levels).The results also showed that treatment of yogurt supplementation at 2 ml per cow per day in rats (Rattus norvegicus) were exposed to formaldehyde are not able to change the effect of formaldehyde exposure to the decrease of antioxidant activity (SOD activity and GSH levels) with the significance level remains highly significant (P <0.01)

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