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Sainstek : Jurnal Sains dan Teknologi

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Published by Institut Agama Islam Negeri Batusangkar

ISSN : 20858019 EISSN : 2580278X DOI : http://dx.doi.org/10.31958/js

Core Subject : Science, Education,

Computer Science & IT Other

Arjuna Subject : Umum - Umum

Articles 15 Documents

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Search results for , issue "Vol 4, No 2 (2012)" : 15 Documents clear

PENGARUH LIMBAH KARET TERHADAP VIABILITAS TELUR BIBIT IKAN MAS (Cyprinus carpio L.) Sumarmin, Ramadhan
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

One of the pollutants that get into the water of the river in Padang city comes from waste rubber factory. The river water is still used for various purposes by the people including seeding and caring goldfish with uncertain products. Based on this situation, the research was done in order to find out the effect of the rubber waste on the viability and the seedling growth rate of goldfish. The research used completely randomized design with 5 and 10 treatments. The observation on the hatching eggs after 2 days of incubation at various treatment and measuring the body weight and length of the fish was done 5 times within five days. The data were analyzed by using ANOVA p <0.05 and BJND extended test. As the results it was found the highest average of viability was in treatment A (control) 76.7% and the lowest at treatment E 30%. Whereas there is no seed growth rate difference between treatments A (control) and B (5%), but significantly different p <0.05 with treatment C, D, and E. It can be concluded that the higher the concentration of waste rubber factory the lower goldfish viability. The concentration of factory waste up to 5% is not influential against the growth seedling goldfish. Key words: waste rubber, viability, gold fish egg

OPTIMASI PRODUKSI XILANASE OLEH B.subtilis AQ1 MENGGUNAKAN RESPONSE SURFACE METHODOLOGY PUTRA, AIDHYA IRHASH
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

Xylanase is an important enzyme for xylan degradation into xylan derivative compounds such as xylose, xylobiose, xylotriose and other oligoxylan. Xylan derivatives can be bioconverted into bioenergy (ethanol), food ingredients as well as pharmaceutical or nutraceutical goods. Some bacteria have been reported to produce xylanases using defferent kinds of agricultural wastes as a substrate. The objective of this experiment was to optimize the concentration of corn cobs as a carbon source and liquid tofu waste as nitrogen source on xylanase production by Bacillus subtilis AQ-1. A 22 central composite experimental design was performed to optimize the corn cobs and liquid tofu waste concentration. A second order quadratic model and a response surface method showed that the optimum condition for xylanase production was 1.1 % (w/v) corn cobs and 0.00198 % (v/v) total N of liquid tofu waste with the highest xylanase production of 122.99 U/ml.Key words: bacillus subtilis AQ-1, xylanase, corn cob, liquid tofu waste

STUDI ab-initio MEKANISME PEMBENTUKAN TRANSISI REAKSI OKSIDASI CO OLEH NO2 DI UDARA Beri, Deski
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

The transition state formation?s mechanism of CO oxidation reaction by molecule of NO2 has been done using ab-initio computation by Density Functional Theory (DFT). Geometry optimation was done by B3LYP and 6-31G* basis set using HyperGauss and HyperDFT computer software. The result is we hypothese that there was three transition state takes place, therewere trans-Transition State (KTt), cis-Transition State (KTc) and cyclic-Transition State (KTs). All of three was gradually takes place in a very short time intervals. Keywords: density functional theory (DFT), geometry optimation, intermediate, transition state

APLIKASI COMPUTER VISION PADA KUALITAS KEMATANGAN BUAH AGUSTIYANTO, FRANS RIZAL
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

This paper introduces the computer vision with the comparison of color methods to classify the variants of fruit (tomatoes, chilies, and apples) which is based on the level or stage of ripe. The color comparison method is quite simple; the tomato images captured by the camera (CCD) will be cropped partly. Then its characteristic color will be extracted and the color grade level will be calculated. The calculation of R (red), G (green) and B (blue) and the transformation of the color to Hue, Saturation, and Value was conducted in order to classify the fruit maturity. Thus, the ripe can be classified into 3, namely Ripe, Half-Ripe, and Un-ripe (not ripe). On contrary, over-ripe cannot be classified because the characteristics of the color is similar with the ripe tomato but the skin texture is slack, so it is not enough to characterize the color used to draw conclusion of being Over-ripeKey words: image processing, computer vision, RGB, HVS

ANALISIS CURAH HUJAN KOTA PADANG SAAT MADDEN JULIAN OSCILLATION PERIODE 1980-2010 Sudiar, Nofi Yendri; Siregar, Plato M.
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

Madden Julian Oscillation (MJO) is a phenomenon that affects the activity patterns of convective clouds and rainfall, thus this study has the objective to analyze the characteristics of the MJO with increased rainfall due to convective activity over Padang. Daily rainfall data observed in seven observation stations analizing wavelet power spectrum to determine the pattern of rainfall in the region, further correlation it with the MJO. Important results obtained based on rainfall data is Padang has equatorial pattern. Correlation between the results obtained with the strong MJO rainfall is -0.54 to -0.687 in phase 3 and phase 4 is -0.564 to -0.69 with a confidence level of 90% -95%. These results indicate that strong MJO events in phase 3 and 4 do not directly affect the increase in precipitation, due to the phase difference and the lag at seven observation stations over Padang. Physically, out of phase and lag means that any strong MJO enters Padang occurs cloud growth process and after the strong MJO exit this area then who have formed the clouds turned into rain. For the above normal category, excess rainfall while strong MJO phase 3 is the observation station Simpang Alai and Tabing respectively 122% and 120%, as well as strong MJO phase 4 is the observation station of Gunung Sariak, Kasang, Gunung Nago, Batu Busuk and Ladang Padi sequential 118%, 116%, 123%, 119% and 117%. Keywords: MJO, rainfall, wavelet

PEMBUATAN SENSOR PROXIMITY BERBASIS SENSOR INDUKTIF METODE DIFFRENSIAL BERBENTUK KOIL DATAR Yulkifli, Yulkifli
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

The physical principle of flat coil sensor was based on the changing inductivity of a flat coil due to disturbance of conductive material in its electromagnetic fields, so that eddy current on the conductive material was occurred. The displacement between flat coil and conductive material was a function of the total inductance L of the sensor system, which will be measured as resonance frequency by using an inductive capacitive oscillator. The measurement system consists of a flat coil, oscillator circuit LC, multimeter and micrometer. In measuring, as independent variables were distance of object and time, while dependent variable was output voltage of flat coil sensor by using differential technique. Data was collected through two ways i.e. direct and indirect measurement. Then data was analyzed by using graph methods and error analysis. Data analysis shown that: 1). The output sensor without differential technique isn?t linear with distance of conductive material; 2). The output sensor with differential technique is inversely proportional with distance of conductive material with negative sensitivity 1,2783 Volt/mm ; 3). The precision of sensor was high with average of precision is 0,999, and 4). The stability of sensor was also high with small output voltage variation. Key words: sensor, flat coil, characteristics, sensitivity, precision, stability

UJI BAKTERIOLOGIS AIR SUMUR PEMUKIMAN PENDUDUK DI SEKITAR TEMPAT PEMBUANGAN AKHIR SAMPAH Irdawati, Irdawati; Fifendy, Mades; Kurniati, Deni
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

The purpose of this study was to determine the quality of well water in residential areas around the landfill of trash (TPA), Balai Gadang Aia Dingin, Padang, viewed from bacteriological aspects. This study was conducted from March to April 2012 in the Laboratory of Microbiology Department of Biology, Science Faculty, Padang State University (UNP). Samples were taken using Proposive sampling method with 10 wells that are encountered by the first well of the landfill to the distance between 0-100 meters. This study uses Most Probable Number (MPN) using a two-stage testing is Presumtive Test and Confirmative Test with a combination of 3:3:3. can be concluded that the quality of well water residential areas around the landfill 90% did not meet the standards set by the Ministry of Health (KEPMENKES) No. RI. 492/MenKes/PER/IV/2010. Key words : TPA Aia Dingin Padang, bacterial aspects, quality of well water

DAYA HAMBAT SARI DAUN SIRIH MERAH (Piper crocatum Ruiz & Pav) TERHADAP PERTUMBUHAN BAKTERI ESCHERICHIA COLI DAN Staphylococcus aureus Indriati, Gustina; Agustina, Agustina; Widiana, Rina
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

Sirih merah (piper crocatum ruiz & pav) has been used, since ancient society, as drugs. The chemical compounds contained in red betel are as antibacterial, the compounds are: flavonoids, alkaloids. tannins and essential oils. The research has been conducted in order to determine the inhibition of red betel leaf extract (piper crocatum ruiz & pav) on the growth of the bacteria Escherichia coli and staphylococcus aureus. This study uses RAL with 6 treatments and 3 replications: A treatment (red betel leaf extract 10%), B (red betel leaf extract 20%), C (red betel leaf extract 30%), D (red leaf extract 40%) , E (red betel leaf extract 50%) and F (amoxicilin 10%) as controls. The results showed no real influence with inhibition diameter on treatment A (6.69 mm), treatment B (8.88 mm), treatment C (7.76 mm), treatment D (9.53 mm), treatment E (12 , 79mm) and treatment F (9.45 mm). From staphylococcus aureus it was obtained significant results with a diameter of inhibition in treatment C (7.70 mm), treatment A (8.22 mm), treatment D (8.58 mm), treatment B (9.53 mm), treatment E (10.39 mm ) and treatment F (17.59 mm). The red betel leaf extract was able to inhibit the growth of bacteria Escherichia coli and staphylococcus aureusKey words: Sirih merah, Escherichia coli, Staphylococcus aureus

KEEFEKTIFAN EKSTRAK DAUN Carica papaya Linn. DENGAN METODE RACUN LAMBUNG UNTUK PENGENDALIAN RAYAP TANAH Coptotermes sp. (Isoptera: Rhinotermitidae) Zulyusri, Zulyusri; Desyanti, Desyanti; Ramadani, Rosi Fitri
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

Termite Coptotermes sp. is one of the most harmful types of termite class of Rhinotermitidae, Coptotermes genus. One of the controlling efforts is by using an extract of Carica papaya leaves. This study aims at finding out the effectiveness of the leaf extract Carica papaya on the termite Coptotermes sp. Mortality, as well as finding out the concentration of the extract of papaya C. leaf highly effecting on controlling the termites Coptotermes sp. This was an experimental research with Completely Randomized Sampling (CRS) in six extract treatments (0%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%) and 3 replications. The mortality data and the loss of feed were analyzed through the analysis of variance (ANOVA) and followed by Duncan test at 5% significance level. The lethal concentration (LC) and lethal time (LT) were analyzed by Probit analysis. The results showed that the leaf extract of Carica papaya can be used to control termites and it functions most effectively at a concentration of 1.5%. The lethal concentration (LC) leaf extract of Carica papaya is 0.005 and lethal time (LT) is 3.201 days. Key words: Coptotermes sp., extract of Carica papaya leaves

STUDI MORFOLOGI SERBUK SARI BEBERAPA SPESIES SOLANUM Chatri, Moralita; Yesti, Yesti
Sainstek : Jurnal Sains dan Teknologi Vol 4, No 2 (2012)
Publisher : IAIN Batusangkar

Pollen is the male genitalia of plants. The pollen morphology can vary within a species and between species, so that it can be used as an identification tool. It also has contribution to other disciplines such as Paleobotany, Paleoecology, Palynology, Aeropalinologi, Medical and determination of honey quality. This study aims to reveal the pollen morphology of some species of Solanum. The Solanum which was studied were Solanum melongena var. serpentinum (purple and white fruit), Solanum melongena var. esculentum (purple and green fruit), Solanum tuberosum, Solanum torvum and Solanum ferox. The design of research is a descriptive study. The method used was asetolisis with 1% safranin staining in 70% alcohol. The characters pollen morphology observed were: units, polarity, symmetry, size, shape, or form surface ornamentation, number and type of aperture. The results showed the unit of single pollen (monads), with isopolar polarity, radial symmetry and size medium. The length of polar axis (P) ranged from 20 to 32.5, while the length of the equatorial diameter (E) ranged from 20 to 37.7, so the form of Solanum pollen can be classified into classes; Oblate, Suboblate and Oblate spheroidal. Aperture found was 3-4 aperture with the aperture found pore located at the equatorial type. In conclusion, several species of Solanum pollen have similarity in terms of units, polarity, symmetry, size and difference in terms of form and quantity of aperture.Key words: pollen, solanum, identification

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Editorial Address Fakultas Tarbiyah dan Ilmu Keguruan IAIN Batusangkar Jl. Sudirman No. 137 Kuburajo Lima Kaum Batusangkar, Sumatera Barat. 27213

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Contact Name
Marjoni Imamora

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Phone
+6282169719397

Journal Mail Official
sainstek@iainbatusangkar.ac.id

Editorial Address
Fakultas Tarbiyah dan Ilmu Keguruan IAIN Batusangkar Jl. Sudirman No. 137 Kuburajo Lima Kaum Batusangkar, Sumatera Barat. 27213

Location
Kab. tanah datar,

Sumatera barat

INDONESIA