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Jurnal Saintek Lahan Kering

SLK
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Published by Universitas Timor

ISSN : 26221020 EISSN : 26221020 DOI : https://doi.org/10.32938/slk.v

Core Subject : Health, Science, Agriculture, Engineering,

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Public Health

Journal of dryland sci-tech (JDLS) covering the field of science and technology in terms of chemistry, biology, mathematics, information technology, and public health and nursing, based on dryland.

Arjuna Subject : -

Articles 82 Documents

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Klasifikasi Tingkat Maturitas Katarak Berbasis Citra Digital Berdasarkan Jangkauan (Range) Nilai Histogram Gede Arya Wiguna; Ramacos Fardela; Jannes Bastian Selly
Saintek Lahan Kering Vol 2 No 2 (2019): JSLK Desember 2019
Publisher : Fakultas Pertanian, Universitas Timor

Cataract is an eye disorder that is at risk of causing blindness. The risk of blindness can be prevented by detecting cataracts as well as the right action in the form of surgery. Examination of cataracts in the eye poly usually uses equipment in the form of a slit lamp. This equipment is only available in hospitals that have eye poly. The lack of hospitals that have slit lamps will cause the number of cataract sufferers to increase. To be able to help overcome this we need a cataract detection system that is easy to implement. In this research, a classification system based on digital image based on the range of histogram values was made. The equipment used to obtain digital images is the Nikon D90 12.3 Megapixel camera with Nikon 50 mm F1.8 AFD lens. The results obtained indicate that the range values for normal eyes are 29–46, immature eyes 54 - 67 and mature eyes 91 - 121. It appears that mature eyes have the highest range. It is hoped that this method can help detect and classify cataracts based on digital image processing.

Analisis Kandungan Logam Berat Kromium (Cr) dalam Sedimen di Perairan Teluk Ambon Bagian Dalam Matius Stefanus Batu; Marselina Theresia Djue Tea; Antho Netty Siahaya; Yeslia Utubira
Saintek Lahan Kering Vol 2 No 2 (2019): JSLK Desember 2019
Publisher : Fakultas Pertanian, Universitas Timor

Analysis of Chromium (Cr) heavy metal content in sediment have been done at inner part of Ambon Bay by using Atomic Absorption Spectrofotometer (AAS). This analysis has been done in six sampling areas, they are : Galala (the first locations), Lateri (the second location), Negeri Lama (the third location), Waeheru (the fourth location), Poka (the fifth location), and Halong (the sixth location). The study aims to determine the content of chromium metal (Cr) in sediments at inner part of Ambon Bay. The analysis showed that the Cr metal content ranged from 33.68-191.74 mg/kg. The chromium (Cr) heavy metal content in sediments is mostly among the quality standards set by the ANZECC (Australian and New Zealand Environment and Conservation Council) in 2000, which is 80-120 mg/Kg

Aktivitas Antibakteri Gel Lidah Buaya Terhadap Staphylococcus aureus Resmila Dewi; Erda Marniza
Saintek Lahan Kering Vol 2 No 2 (2019): JSLK Desember 2019
Publisher : Fakultas Pertanian, Universitas Timor

Aloe vera is a functional plant because can be used to treat various diseases, including skin diseases by Staphylococcus aureus infection, which causes inflammation of the skin, ulcers, acne, and so on. This research aimed to determine the inhibited effect of Aloe vera gel to the growth of Staphylococcus aureus and the most effective concentration for the resistance against both of bacteria tested. Antibacterial activity of Aloe vera gel was tested using well diffusion method on Mueller Hinton Agar (MHA) at different concentrations 30; 40; 50; 60; 70%. Observation was conducted after incubation for 48 hours at room temperature. The results showed that Aloe vera gel inhibition the growth of S. aureus, it was indicated by the formation of inhibition zones. The most effective of Aloe vera gel inhibiting the growth of S. aureus at 70% with the size 12,81 mm. This shows that the higher the concentration of aloe vera gel is given, the greater the diameter of the inhibition zone.

PEMANFAATAN ABU TONGKOL JAGUNG SEBAGAI ALTERNATIF KATALIS BASA PADA PEMBUATAN BIODIESEL DARI MINYAK JELANTAH Risna Adu
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

The utilization of corncob ash as an alternative base catalyst source for biodiesel production has been studied to determine the corn cob's ash potential in transesterification proccess from waste cooking oil. Corn cob ash properties was analyzed by AAS and alkalinity test to measured potassium levels and its form. Alkaline solution was obtained by stirring corn cobs ash in methanol for 4 hours. Transesterification of waste cooking oil was carried out by varying ash amount for 5, 10, 15, and 20 g (molar ratio of methanol/oil 6:1 at 60 oC for 2 hours and stirring speed was kept constant); and methanol /oil molar ratio for 3: 1, 6: 1, 9: 1 and 12: 1 (optimum amount of ash). Methyl esters content was determined by GC-MS, while some physical and chemical properties of biodiesel were measured using the ASTM standard method. Potassium content of corncob ash was 38.76% (wt), the potassium might be presence in carbonate form. Optimum condition of biodiesel conversion was reached at the use of 10 gr corn cob ash and methanol/oil molar ratio of 6: 1. GC-MS data showed that biodiesel from waste cooking oil are methyl esters which are dominated by methyl linoleate and methyl palmitate. The quality of biodiesel products (viscosity and density) meets the requirements of biodiesel specifications according to SNI 7182-2015. Corn cobs ash can be used as an alternative basic catalyst source for biodiesel transesterification. On the other side waste cooking oil and corn cobs value can be improved by using them in the transesterification process.

ANALISIS DIAZINON PADA TANAH LAHAN PERTANIAN MENGGUNAKAN KROMATOGRAFI CAIR KINERJA TINGGI Marselina Theresia Djue Tea; Akhmad Sabarudin; Hermin Sulistyarti
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

A method for the determination of diazinon in soil samples has been developed. The analyte was extracted with acetonitrile from farmland soil sample. Determination and quantification of diazinon were perfomed by high perfomance liquid chromatography (HPLC) with an UV detector. Optimum conditions for diazinon analysis were eluent composition of acetonitrile:water ratio of 60:40, 0.4 mL/min of flow rate, and 220 nm of wavelength. Under the optimum conditions, diazinon linearity was between 1 and 25 mgL-1 with R2 of 0.9976, 1.19 mgL-1 LOD, and 3.98 mgL-1 LOQ. When the method was applied to the soil sample, both pesticides showed acceptable recoveries for real sample of more than 85%: thus, the developed method meets the validation requirement. Under this developed method, the concentrations of diazinon in the soil samples were below the LOD and LOQ (0.577 mgL-1). Therefore, it can be concluded that the soil samples used in this study did not contain diazinon.

EKSPLORASI JAMUR MAKROSKOPIS DI HUTAN OELUAN KABUPATEN TIMOR TENGAH UTARA Lukas Pardosi; Florian Mayesty Prima Makin; I Gede Arya Wiguna
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

Research on the diversity of macroscopic fungi in the Oeluan Forest area of North Central Timor district has never been reported. This research was conducted in January 2020 with a geographical location of 9° 2¢ 48 "LS-9° 37¢ 36" LS124° 4¢ 2 "BT-124°46¢ 0" BT, this research was carried out on four different lines. The length of the observation path is 100 m. The method used in each observation lane in each method is the roaming method and purposive sampling, based on the presence of macroscopic fungi that are considered to represent the area, after that it is continued by recording the number of individuals, collections and documentation. Observation and collection of species is carried out exploratively. From the results of the study found 9 species of macroscopic fungi namely, Ganoderma aplatum, Earliella scabrosa, Polyporus tenuiculus, Polyporus squamosus, Mikroporus xanthopus, Favolus grammocephalus, Pycnoporus cinnabarinus, Ganoderma lucidium, Laccaria vinaceoavellaneae

OPTIMASI VOLUME LARUTAN PREKURSOR NATRIUM SILIKAT HASIL PENGOLAHAN ABU SEKAM PADI TERHADAP KELENTURAN PLASTIK KOMPOSIT SILIKA TERIMOBILISASI EDTA-AG DAN KITOSAN Hermania Em Wogo; Martha C.W Ndoen
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

It has been done a study, which it aims to know the volume optimazation of precursor solution sodium silicate as a product of rice husk ash processing to the flexibility of EDTA-Ag and chitosan immobilized silica composite plastics. The silica used in this study was a destruction product of rice husk processing. the silica content in rice husk used in this experiment was 93.608 %. The solution volume of sodium silicate used was 10, 30 dan 50 mL. Meanwhile, the chitosan variations used were 0.3 and 0.7 gram. The test result of surface area with a titration method exhibited that the highest surface acidity of EDTA-Ag immobilized silica is 3,4 mmol/g at the volume of sodium silicate 30 mL. While, the area of optimum surface using a blue methyilene is 17,61131 m2/g for the volume of sodium silicate 30 mL at the contact time 80 minutes. Based on characterization result using FTIR, EDTA-Ag immobilized silica has been synthesized contains Si-OH groups from the gel silica (1083.92 cm-1), -CH2- group (1384.79 cm-1) and –NHCOCH3 group from EDTA (1639.38 cm-1). It was done a for mechanical test of plastics from EDTA-Ag and chitosan immobilized silica composite, the highest elongation percentage was obtained, namely 27,5 % at the chitosan variation 0.3 gram.

KARAKTERISASI SUBSTRAT DAN SUHU EKSTRAK KASAR LIPASE Aspergillus niger M1407 Amelia M Salmon; Mellissa E. S. Ledo; Merpiseldin Nitsae
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

Isolation of crude extract lipase Aspergillus niger M1407 using kesambi seeds flour medium through solid state fermentation was carried for substrate and temperature characterization fo determenie optimal condition enzyme substarate reaction. The aim of this study are determenie the substrate and temperature profile crude extract lipase Aspergillus niger M1407. This research was conducted in the laboratory (microbiology and chemistry) of the Biology Education Study Program at Artha Wacana Christian University, Kupang, in January 2019 untel March 2019. The method used in this study divided into four stages, namely medium preparation for Aspergillus niger M1407 lipase; Solid-State Fermentation medium for 7 days; substrate characterization using oleic acid + ethanol in isooktan and oleic acid + methanol in isooktan and temperature characterization was done at 20oC, 30oC, 40oC, 50oC, and 60oC. Analysis of crude extract lipase Aspergillus niger M1407 activity using the titration method. Data obtained in quantitative descriptive analysis. The results of this study indicate that the crude extract lipase Aspergillus niger M1407. crude enzyme lipase Aspergillus niger M1407 activity is better on oleic acid methanol + substrate which has 200 U / mL activity while temperature characterization show best activity at 40oC with 580 u / mL lipase activity.

PEMURNIAN MINYAK GENOAK ( Acorus calamus ) ASAL PULAU TIMOR MENGGUNAKAN DISTILASI PENGURANGAN TEKANAN Rensy A. Henci; Reinner I Lerrick; Theo Da Cunha
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

A research about Asaron oil purification produced over Stahl distillation has been done. This research was conducted by distillation of genoak’s roots, rhizomes and laeves whilist the purification was carried out through reduced pressure distillation. A yellowish oil was yield respectively 1,83 gram from the roots and rhizomes and 1,26 gram from laeves which the was revealed as 90,49% pure of asaron confirmed by GC-MS, 1H-NMR and FT-IR analysis.

PEMBUATAN BIODIESEL MINYAK JELANTAH MENGGUNAKAN BIOKATALIS EKSTRAK KASAR LIPASE DARI BIJI KESAMBI (Schleichera oleosa L.) M A Nenobahan; M E. S Ledo; M Nitsae
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

Biodiesel is one type of alternative diesel fuel that is environmentally friendly,can be updated and used as a substitute for diesel. Used cooking oil has the potential as a raw material for making biodiesel because it contains triglycerides and free fatty acis that can be converted into methyl esters. The general production of biodiesel is produced through esterification and transesterification reactions using chemical and biological catalysts. The purpose of this study was to determine the process of making biodiesel using used cooking oil with biocatalyst crude extract of kesambi seed lipase. The stages of research are, purification of used cooking oil, isolation of crude extract of lipase enzyme, analysis of hydrolysis activity test of transesterification activity, hydrolysis of oil esterification activity test, esterification activity, hydrolysis of oil esterification activity test, esterification reaction, separation of biodiesel, and characterization of biodiesel. The data analysis used was descriptive quantitative data analysis and the transesterification activity test was carried out by multiple linear regression test. Based on the results of the study it was obtained that the density was 0.8605 g/cm2, the viscosity was 1.397 mm2/s and the acid number was 0.65 mgKOH/g.Thus, making used cooking oil biodiesel using a crude lipase extract biocatalyst needs to be done in an effort to develop biodiesel production by utilizing kesambi seeds as biocatalysts.

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Gebhardus Djugian Gelyaman

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lahankeringjsaintek@gmail.com

Editorial Address
Universitas Timor, Jln. KM 9 Kel. Sasi, Kefamenanu, Kab. TTU, Prov. NTT

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Nusa tenggara timur

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