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SAINS DAN MATEMATIKA
Published by Universitas Diponegoro
Articles
273
Articles
The Growth of Botryococcus braunii Microalgae as a Lipid Producer in a Mixed Medium of Coconut Water and Seawater

Saputro, Bintoro Rudi ( Biology Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Kusdiyantini, Endang ( Biology Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Kusumaningrum, Hermin Pancasakti ( Biology Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Energy needs in fuel sector tend to increase for supporting human life. Green microalgae (Chlorophyceae) can be used as an alternative solutions for bioenergy. Botryococcus braunii is lipid producer microalgae which can be processed further into biodiesel. Microalgae growth medium such as Walne can be substituted with coconut water that reducing economical cost. This research aims to determine the growth of B. braunii using coconut water and its effect on lipid production. The experiment conducted into five treatments of coconut water consist of P0 (0%), P1 (10%), P2 (7.5%), P3 (5%), and P4 (2.5%) for five days incubation and three repetitive step. Microalgae growth was calculated according to cell count using hemocytometer. The results showed that 2.5% coconut water substitution exhibited the best growth rate and lipid production, i.e. the amount of 547 cells / ml and produced lipid level according to these treatment increased 179% comparing with control.

Structure Elucidation of the Leaf of Tithonia diversifolia (Hemsl) Gray

Amanatie, Amanatie ( Chemical Education Department, Faculty of Mathematics and Natural Sciences, State University of Yogyakarta ) , Sulistyowati, Eddy ( Chemical Education Department, Faculty of Mathematics and Natural Sciences, State University of Yogyakarta )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Stucture elusidation of the leaves of Tithonia diversifolia (Hemsl) A.Gray, were reported. The compounds were obtained by maceration and analyzed by GC–MS. The compounds of the leaves were the non volatile fractions of the plant are a rich source of Camphene 0, 6 (SI 9.53)., β-pinene 10, 9 (SI 8, 9)., Myrcene 0.8(SI 9, 92)., 1, 8-Cineole0, 91 (SI 1, 03)., β–Caryophyllene 2, 08 (SI 1, 419)., β-Gurjunene0.4(SI1, 428)., α Humulene1.6 (SI 1, 454) Germacrene D 12, 6 % (SI 1, 481), characterized presented the Tithonia diversifolialeaf

Effect of Turmeric (Curcuma domestica Vahl.) Extract on Broiler Blood Cholesterol Levels

Muliani, Hirawati ( Biology Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

This study aimed to determine the effect of turmeric extract on blood cholesterol levels of broiler chickens. The material used in this study were 24 male broiler chickens type of CP 707 and acclimated for 1 week. The chickens were then grouped into 4 treatment groups with 6 replicates in each group. The treatments were T0: without treated (control), T1: given the turmeric extract 200 mg/kg/day; T2: given the turmeric extract 400 mg/kg/day; T3: given the turmeric extract 600 mg/kg/day. The Turmeric extract was given in capsule form and treatment was in 6 weeks. The main parameters measured were the chicken blood cholesterol levels. The supporting parameters measured were body weight and feed intake. The data obtained were analyzed by variance analysis with a completely randomized design and Duncan test. The results showed that turmeric extract had no effect on blood cholesterol levels broiler.

Zeolite-A Synthesis from Glass

Saraswati, Indah ( Chemistry Department, Faculty of Medicine, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Zeolite can be used as ion exchanger, catalyst, and adsorbent.  One type of synthetic zeolites is zeolite-A which being developed to overcome the weakness of natural zeolites for their difference of pore size. This research is aimed to study the synthesized of zeolite-A from wasted glasses as silica source. Hydrogel method was used by reacting sodium aluminate into a sodium silicate solution. The gel formed was heated at 80°C for 8 hours and to produce a white solid. The solid result were characterized by XRD, FTIR, and AAS. The XRD analysis shown that the yield which formed closest to zeolite-A structure was in concentrate variation of sodium silicate and sodium aluminate of 1.05 : 1. This result also can be confirmed by FTIR analysis.

The Effect of BaCO3 Compound Changes on the Formation of Magnetic Material BaFe12O19

Priyono, Priyono ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Cahyono, Agung ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Marhaendrajaya, Indras ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Subagio, Agus ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Gunawan, Vincensius ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

BaFe12O19 is a permanent magnetic material which has superior properties to be excellent until the late of twentieth century. Some of the obstacles in the synthesis of the material using a stoichiometric composition is a difficulty to obtain a single phase and the second phase is always found. This research attempted to make modifications on the initial non-stoichiometric composition by varying the fraction of Ba/Fe through BaCO3 and Fe2O3 compound through solid state reaction mechanism. This solid state reaction was initiated by mixing various fractions of BaCO3 and Fe2O3 powder composition and compacted to produce a homogeneous mixture using a planetary milling. After drying and molding, it was obtained a homogeneous mixture like a cylinder with a diameter of 2:54 cm and a thickness of 0.5 cm. The BaFe12O19 phase was obtained by heating the sample at a temperature of 1200 ° C for 4 hours. To determine changes in the fraction of Ba/Fe before and after sintering, the samples were tested by X-Ray Fluorescence (XRF), while the structure and crystallinity were tested by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results showed that during the heating process, the reduction of barium fractions exceeded 5% from of their initial weight, while changes in the fraction of Fe was not significant. The results of structure and crystallinity measurement showed that the addition a substantial amount of barium carbonate can lead to the decrease of crystallinity from 35.271 nm to 11.265 nm.

Adsorption of Indigo Carmine Dye using Cetyltrimethylammonium Bromide (CTAB) Surfactant Modified Zeolite

Fauziyah, Nurul ( Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Sriatun, Sriatun ( Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Pardoyo, Pardoyo ( Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
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Abstract

Research of indigo carmine dye adsorption using natural zeolite modified by cetyltrimethylammonium bromide (CTAB) surfactant has been done. The purpose of this study was to modify the natural zeolite using CTAB surfactant and to determine its ability on the adsorption of indigo carmine dye. The stages of the study included the activation of zeolites, modifying zeolites using CTAB surfactant and adsorption test of indigo carmine dye. The results showed that the zeolites could be modified by CTAB. They were then characterized by the existence of FTIR absorption band at wavelengths of 1404.18 cm-1 and 2800-3000 cm-1. The various concentration of indigo carmine (5, 10, 15, 20 ppm); contact time (15, 30, 45 minutes) and pH (3, 4, 5, 6, 7, 8, 9) were studied and the highest condition was reached at the 45 minutes, pH= 3 and indigo carmine concentration of 20 ppm for 0.5 and 1 mM CTAB (15.35% and 23%) and indigo carmine concentration of 5 ppm for 10 mM CTAB (96.18%). The adsorption of indigo carmine tended to increase with increasing the concentration and contact time and decreased with increasing the pH.

Correction of 2D Isodose Curve on the Sloping Surface using Tissue Air Ratio (TAR) Method

Nuzula, Nurul Firdausi ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Adi, Kusworo ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Anam, Choirul ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
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Abstract

The curve of 2D isodose is used to determine the dose distribution in patient treated by radiotherapy. Therefore, isodose curve is very useful for planning and evaluating of the dose received by the patient. Correction of 2D isodose curve for sloping surface is very important due to the skin of patient is not flat. In this study, the correction of isodose curve was calculated using tissue air ratio (TAR) method for radiation field size of 10x10 cm2. The correction factor was obtained by comparison of TAR value for effective depth and TAR value for total depth. The correction factor then was multiplied to isodose curve for flat surface. In this study, the software for calculating the automated correction factor due to sloping of patient surface has been successfully developed. It was found that if the sloping of patient surface increases then the corrected isodose curve increases. Key wods: 2D isodose curve, tissue air ratio (TAR), correction factor, sloping patient surface.

The Potential Test of Fungal Antagonist Trichoderma viride to inhibit the Growth of Pathogenic Fungi Fusarium moniliforme and Alternaria solani In-Vitro

Purwantisari, Susiana ( Biology Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Evendi, Agus ( Biology Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
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Abstract

Fusarium moniliforme and Alternaria solani are two types of mold which often cause the diseases of cultivated plants. Fusarium moniliforme causes the ear rot disease on corn and the wilt disease of Solanaceae family. Whereas the pathogenic fungus Alternaria solani causes an early bright disease on the onion and potato. This aim of this study was to determine the ability of fungal antagonist Trichoderma viride in inhibiting the growth of Fusarium moniliforme and Alternaria solani in vitro. The growth inhibition ability test were conducted on dual cultures by growing the fungal antagonists with pathogenic fungi in Petri dish containing potato dextrose agar media face-to-face in a distance of 3 cm. Percentages of the growth inhibiting were observed every day in 7 days incubation. The results showed that the fungal antagonist T. viride exhibited the highest inhibition on F. moniliforme in 3 days incubation period which was 63.07 %. Yet the highest inhibition against A. solani was in 2 days incubation period which was 57.35 %. T. viride growth continued to increase since the first day until the seventh day incubation period but contrarily the growth of both pathogenic fungi underwent inhibition. This suggested that T. viride was potential as a biological control agent of F. moniliforme and A. solani growth and have a potency as an active bio fungicide ingredient. Keywords: Dual culture; percentage inhibiting; Trichoderma viride; Alternaria solani; Fusarium moniliforme

Design of Non-Invasive Glucometer using Microcontroller ATMega-8535

Hidayanto, Eko ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Sutanto, Heri ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Arifin, Zaenal ( Physics Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
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Abstract

Symptoms of Diabetes Mellitus (DM) or diabetes could be indicated by measuring blood sugar levels in the body. One of the health technology to detect blood sugar in non-invasive is to utilize the absorption of laser light and oxymeter sensor capable of generating a voltage change on a variety of fluid medium. This study has been designed using the blood sugar measuring device microcontroller ATMega 8535 as a minimum system in controlling the value of output in the form of data digital. System/equipment to be fabricated in this study is a non-invasive method (without injuring the patients body when taking a blood sample) to determine the blood sugar content by exploiting the physical properties of absorption of laser sensors on a variety of blood sugar content. To improve the quality of the test data used 8-bit microcontroller that is capable of separating the output data 256 bits (binary). Each of these bit values can be used to replace manual sensor test results that have analogue voltage output of the data. This analogue data will then be converted to analogue to digital converter (ADC) into digital values are displayed in the liquid crystal display (LCD) that is directly readable by the measured/patients in a short period of time less than 5 minutes. The results of the research can be developed into a national program providing portable medical test equipment is cheap and movable. Keywords: DM, Blood Sugar, Sensor of Oxymeter, Red Laser, Microcontroller ATMega 8535

Effect of Series Circuit on the Lactose Bioelectricity of a Microbial Fuel Cell System using Lactobacillus bulgaricus

Hayati, Dini Noor ( Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Nuryanto, Rahmad ( Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University ) , Suyati, Linda ( Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University )

JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

The need for alternative energy, especially electricity at this time is increasing. The decreasing amount of fuel that cannot be updated, encouraging scientists to conduct researches in finding alternative energy sources which are environmentally friendly, one of the alternative energy is the Microbial Fuel Cell (MFC). The research on the effects of a series circuit on the production of lactose bioelectricity microbial fuel cell system using Lactobacillus bulgaricus has been conducted. This study aim was to assess the effect on the production series circuit lactose bioelectricity MFC system using microbes Lactobacillus bulgaricus. Stages of research included a microorganism preparation of Lactobacillus bulgaricus, and measuring the potential difference in a single, series 1 and series 2 circuits in the MFC system. The potential difference on the measurement of a single, series 1 and series 2 on the substrate lactose were 45 mV / 100mL; 57 mV / 100mL; 58 mV / 100mL respectively where the power were 105.75x10-6 mW; 136x10-6 mW; 139.2x10-6 mW. These results suggested that series circuit was able to increase the potential difference and power on the substrate lactose and tofu whey the MFC system according to Ohm’s law. Keywords: Lactose, microbial fuel cell, Lactobacillus bulgaricus, a series circuit