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Natural B
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Articles 200 Documents
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Bioaccumulation of Heavy Metals Pb, Cd And Zn on Bentos in the Estuary of Porong River Sidoarjo Yudita Prihatini Puji Rahma Sari; Barlah Rumhayati; Arie Srihardyastutie
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.402 KB) | DOI: 10.21776/ub.natural-b.2017.004.01.1

Abstract

This research is done to know the influence of sort and size of biota, pH dan Salinity of water body toward Bioconcentration Factor (BFC) heavy metal, and protein characterization in biota contaminated with heavy metal. Water sampling, biota and sediment are done in two locations in estuary River Porong i.e. estuary watery nearby river and estuary nearby sea. The parameter of water circumstance employed is pH and salinity. The analysis of metal in water sample and biota is done after destruction uses aqua regia. The fraction of metal which is easily switched in metal sediment is analyzed after extraction uses acetate acid. The concentration of metal is analyzed with spectrophotometer of atom absorptivity. Characterization of protein in biota sample is done through electrophoresis employing SDS-PAGE. The result of this research is seen that Sergestide(shrimp) and Corbulidae(shellfish) possess the same big ability in accumulating metal Pb, Cd and Zn. Biota with big size (>1cm) has BCF higher than biota with small size(<1cm). pH and salinity of water body does not influence BCF value. System of biota defense contaminated with heavy metal is marked by protein hsp40(35 kDa), hsp60(50kDa) and hsp90(90kDa).
Temperatures Surface Mapping of Wurung Crater Area, Bondowoso Regency, East Java In Determination Geothermal Manifestations Endah Juniarti; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1358.45 KB) | DOI: 10.21776/ub.natural-b.2017.004.01.9

Abstract

A research using remote sensing have been done on Kawah Wurung-Ijen. This research was conducted to analyze the distribution of land surface temperature and to identify the geothermal manifestations. The land surface temperature was obtained by using emissivity method of calculating the Normalized Difference Vegetation Index (NDVI). Remote sensing data was used more secund data from Landsat 8. The result shows that the research area has the land surface temperature distribution in ranges 10°C to 50°C. The interpretation shows any anomalous area in ranges 31°C to 50°C that indicated as geothermal potential area. The anomalous are associated with volcanic areas. In the West is associated with Mt. Genteng, in the North is associated with Mt. Gending Waluh. In addition, there is also an anomaly in the East precisely around kolovium of Mt. Kukusan.
Optimization of Pesticide Analysis Method for Diazinon and Chlorantraniliprol Using High Performance Liquid Chromatography (HPLC) Marselina Theresia Djue Tea; Akhmad Sabarudin; Hermin Sulistyarti
Natural B, Journal of Health and Environmental Sciences Vol 4, No 2 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (190.077 KB) | DOI: 10.21776/ub.natural-b.2017.004.02.1

Abstract

Methods of obtaining diazinone and chlorantraniliprol in soil samples have been developed. Analytes were extracted using acetonitrile by using an ultrasonic solvent extraction method (USE). The discovery uses high performance liquid chromatography using a UV detector. The optimum conditions for the separation of both pesticides are Acetonitrile composition: Air (60:40), flow rate 0.4 mL / min, and at 220 nm wavelength. The more the amount of acetonitrile in the eluent mixture the faster the retention time in the column. Retention time respectively, chlorantraniliprol 10,525, and diazinon 21,029.
Study of Thermal Neutron Flux and Generated Energy from Linac using CR-39 Detector in Liquid Medium Kurnia Nur Widyanti; Chomsin S. Widodo; Bunawas Bunawas
Natural B, Journal of Health and Environmental Sciences Vol 4, No 3 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (574.43 KB) | DOI: 10.21776/ub.natural-b.2018.004.03.4

Abstract

Linac surgery is required in radiotherapy activities. However, if Linac operated more than 8 MV can cause additional radiation of neutrons, as well as triggers forming secondary cancer. The study was conducted to determine the distribution of thermal neutron flux and energy responses on the trace. One method to detect neutrons is to use a nuclear trace detector. Measurements were made using a CR-39 detector coated with a Boron radiator. A number of detectors were placed on the surface of the sphere and entered into a 30×30×30 cm3 fantom. Irradiation is done by placing fantom under Linac gantry with 100cm SSD distance. After irradiation, then etching. The results of the measurements showed that the distribution of thermal neutron fluxes spread in all directions. Linac 10 MV neutron flux value varies, starting at 0° of 1,637×103 n/cm2.s and decrease at 135°of 1.285×103 n/cm2s. The highest Linac 15 MV at detector position 0° of 10.723x104 n/cm2.s and decreased at 135° of 5.142x104 n/cm2s. This proves that the farther from the source the less the thermal neutron flux value due to the collision process. While Linac 10 MV and 15 MV produce range of diameter ranging from 8.21-16.75 (μm) and 9.21-17.45 (μm), with energy response value 0.5-3.5 MeV. The larger the energy response, the smaller the diameter and vice versa, this is due to the effect of penetration on the depth of the distance resulting in smaller track.
Testing the Efficiency of The Sawdust dan Wood Glue Particulate Filters to Reduce The PM2.5 Emissions from Motorcycles Arinto Yudi Ponco Wardoyo; Arsyal Karismadika Rumpoko; Abdurrouf Abdurrouf
Natural B, Journal of Health and Environmental Sciences Vol 4, No 4 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.216 KB)

Abstract

The increase of motor vehicle population in Indonesia causes the increase of pollution substances in ambient air, such as Particulate Matter with the diameter <2.5 µm or fine particle (PM2.5). There are many methods developed to reduce the PM2.5 concentrations emitted by motor vehicles, such as a biomass particulate filter. This study was aimed to develop biomass PM2.5 filters made of sawdust and wood glue with three different composition ratio: F1, F2, and F3. The PM2.5 concentrations before and after passing through the filters were measured using a Digital Dust Monitor (Kanomax, Model 3443) for 200 seconds of the sampling times. The filter efficiency was obtained from the reduction ratio of the PM2.5 concentrations before and after being filtered. Based on the surface morphology test using an electron microscope SEM, the diameters of the filter pores were 9.11 – 19.7 µm with the different densities. The efficiency was 33% to 52%, depending on the ratio of the sawdust and wood glue. A higher filter density (2.72 x 10-3 g/cm3) generated a higher filter efficiency (52%).
Tensile Strength and Elongation Characteristics of Bioplastics Made from Cilembu Sweet Potatoes Starch with Various Types of Plasticizers Lailatin Nuriyah; Gancang Saroja; Muhammad Ghufron; Arvi Razanata; Nova Fathur Rosid
Natural B, Journal of Health and Environmental Sciences Vol 4, No 4 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.591 KB)

Abstract

Nowadays, many researchers are doing research in the field of degradable plastics with replacing synthetic polymers with natural synthetics for resulting the bioplastics. A natural raw that often used by the researcher is starch. For producing the bioplastic, the starch is mixed with plasticizers. The aims of this research are for observing the influences of the plasticizer to the tensile strength and elongation of bioplastic that made from the starch of Cilembu sweet potato. The plasticizers that used in this research are glycerol, sorbitol, and egg white. The bioplastics are produced in four stages, such as starch producing, heating and adding of the plasticizers, casting, and measuring the tensile strength and elongation. In the producing process of starch, firstly, the potato was destroyed, then it was blended with fresh water, after that it was settled down, followed by filtering and drying. The next stage was heating and adding of the plasticizers. The process of glycerol and sorbitol adding did at 45 oC while the heating process performed until gelatinization temperature was reached. However, while using egg white as a plasticizer, the process was started at 50 oC. After that, the casting stage was done, followed by the last stage, the testing of bioplastic samples. The results of the experiment show that the variation of the plasticizer affects the tensile strength and elongation of the bioplastic. The addition of plasticizer as many as 2,8% reduces the tensile strength of the bioplastic by 90% for glycerol and 75% for sorbitol. Whereas with the addition of the egg white, the tensile strength of the bioplastic is increased to 49%. For elongation property of the bioplastic, both glycerol and sorbitol as many as 2,8% will decrease the elongation value 32,8% and 16,1% respectively. However, the elongation values of the bioplastic fluctuated for the white egg plasticizer.
The CWT Feature's Uniqueness Analysis of EEG Signal Against 5 BCI Wheelchair Control Indicators Using the Friedman Method Firdaus, Ahmad Kanzu Syauqi; Nadhir, Ahmad; Naba, Agus
Natural B, Journal of Health and Environmental Sciences Vol 4, No 4 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1095.546 KB)

Abstract

The analysis of the feature’s uniqueness of the electroencephalograph (EEG) signal extracted by continuous wavelet transform (CWT) method against the five BCI wheelchair control indicators has been done. The usage of Friedman method as measuring the uniqueness level of EEG signal features as well as their significance is used in this research. The EEG signals from three subjects that sitting on a regular chair were recorded when they were performing mental commands as seem as controlling a wheelchair with five control indicators. The recorded signals are decomposed by CWT. The absolute mean (|µ|) and the deviation standard (σ) of the CWT decomposition results are used as feature. Then, the uniqueness of |µ| and σ features are analyzed using Friedman Method. Based on the experiment results, it is known that the proposed method is able to map features according to their uniqueness level. The experiment result shows that the highest uniqueness value of |µ| feature from three subjects are 400 (“forward – backward” indicators), 437 (“neutral – turn left” indicators), and 597 (“neutral – turn left” indicators) respectively. While the highest uniqueness value of σ feature from each subjects are 380, 419, and 568 respectively in the same indicator pairs as |µ| feature.
The Relationship Between Honey's Floral Origins and The Electrical Impedance of Honey Variants Vivien Dwi Indriyani; Didik Rahadi Santoso; Chomsin Sulistya Widodo
Natural B, Journal of Health and Environmental Sciences Vol 4, No 4 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (257.875 KB)

Abstract

One of the factors that influence the composition of honey is the plant that became the source of nectar. Honey derived from one plant species has a different composition with honey from other plant species. This study aims to analyze the effect of the origin of honey flower on the value of electrical impedance by using impedance spectroscopy and to analyze the relationship between ash content and electrical impedance in honey. This study used four gold needle electrodes and a set of PicoScope 5244B tools to measure the value of honey impedance. Measurements are made by injecting a current of 10 μA and using frequencies 1 Hz to 2 MHz. This study also measured ash content in honey. The sample used is kelengkeng, kaliandra, randu, coffee, and rubber honey. The results showed that the origin of honey flower affects the value of electrical impedance. The relationship between impedance and ash content is the smaller the ash content in honey the impedance value is greater.
The design of Plasma Reactor and Study of Oxgyen Gas Flow Effect against to the Carbon Ashing Rate in Steel K110 Antonius Prisma Jalu Permana; Bernardus Crisanto Putra Mbulu
Natural B, Journal of Health and Environmental Sciences Vol 4, No 4 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.975 KB)

Abstract

Thin film technology is a green technology in order to decrease industrial waste. The need of thin film cleaner in recoating process is a must. Build up of a plasma reactor using oxygen gas and generate with 2.45GHz microwave was studied. The main objective of this research was to determine alternative plasma generation using high frequency microwave 2.45GHz as a thin film cleaning media on thin film technology. The results show that plasma could generate with maximum pressure at 3cmHg or 30 Torr and it could decrease carbon on surface of steel K110.
Antimicrobial Potential of Methanol Extract from Kastuba Leaf (Euphorbia pulcherrima Willd.) Atwazah Taisir Ibrahim; Kurniasih Suketi; Dyke Gita Wirasisya
Natural B, Journal of Health and Environmental Sciences Vol 5, No 1 (2019)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Some bacteria have been resistant to one or more types of antibiotics, so an effort to find new antimicrobial sources based on medicinal plants is needed. Research that has been done shows that there are 22 types of plants used as wound treatment used by local people of Timbanuh, East Lombok, one of them is kastuba (Euphorbia pulcherrima Willd.). This study was conducted to test the antimicrobial potential of kastuba leaf extract which has been used ethnomedicinely as a wound teratment in Timbanuh. The antimicrobial activity of kastuba extract was tested against Staphylococcus aureus bacteria. This test used 4 samples. Sample 1 (leaf part 1-5, wind dry method), samples 2 (leaf part 6-10, wind dry method), samples 3 (leaf part 11-15, wind dry method), and sample 4 (leaf part 11-15, oven dry method). The measurement of the antimicrobial potential was carried out by the well diffusion method. The results showed that kastuba leaf extract (samples 1 to 4) at concentration 10 mg / 100µL had a inhibition zone of 9,208; 10,041; 10,583; 11,541 mm and 11,85; 12.08; 14.25; 15.92 mm at concentration 20 mg / 100µL. Sample 4 showed larger inhibition zone affected by different drying method used. The conclusion of this study is kastuba leaf extract has the potential as an antimicrobial.

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