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Jurnal Ilmiah Sains
Published by Universitas Sam Ratulangi
ISSN : 14123770     EISSN : 25409840     DOI : https://doi.org/10.35799/jis.v22i2.40961
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Mathematics Physics
Jurnal Ilmiah Sains (Journal of Scientific Sciences) is the Journals Published by Faculty of Mathematics and Natural Sciences, Sam Ratulangi University. Jurnal Ilmiah Sains Published Twice a Year, i.e April and October. Jurnal Ilmiah Sains  welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Mathematics Statistics Computer Science Physics Chemistry Biology
Arjuna Subject : Umum - Umum
Articles 12 Documents
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Search results for , issue "Volume 21 Nomor 1, April 2021" : 12 Documents clear
Arang Aktif Gambut sebagai Filter Logam Berat Mercury (Hg) Sri Fatmawati; Nur Inayah Syar; Suhartono Suhartono; Dara Maulina; Ridwan Ariyadi
JURNAL ILMIAH SAINS Volume 21 Nomor 1, April 2021
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (589.019 KB) | DOI: 10.35799/jis.21.1.2021.32908

Abstract

Penelitian ini bertujuan menguji filter arang aktif gambut dalam menyerap logam berat mercury (Hg) pada air sungai Kahayan yang tercemar. Proses pembuatan arang aktif melalui beberapa tahap yaitu: tahap karbonisasi, tahap penghalusan, dan tahap pengaktifan secara fisika. Mutu arang aktif mengacu pada persyaratan SNI 06-3730-1995 meliputi kadar air dan kadar abu. Hasil uji mercury analyzer menunjukkan bahwa arang aktif gambut mampu menyerap logam berat mercury (Hg) dalam air. Kadar logam berat mercury (Hg) berkurang setelah dilakukan proses adsorbsi yaitu sebagai berikut: ukuran serbuk gambut 40 mesh mampu menyerap logam berat mercury (Hg) sebesar 50 % ; ukuran serbuk gambut 60 mesh d mampu menyerap logam berat mercury (Hg) sebesar 75%.Kata kunci: arang aktif; gambut; logam berat; mercuryPeat Activated Charcoal as a Heavy Metal Mercury (Hg) Filter ABSTRACTThis study aims to test the activated peat charcoal filter to absorb heavy metal mercury (Hg) in polluted Kahayan river water. The process of making activated charcoal goes through several stages, namely: the carbonization stage, the refining stage, and the physical activation stage. The quality of activated charcoal refers to the requirements of SNI 06-3730-1995 including moisture content and ash content. The results of the mercury analyzer test showed that peat-activated charcoal was able to absorb heavy metal mercury (Hg) in water. The heavy metal mercury (Hg) content was reduced after the adsorption process was carried out, namely as follows: the size of 40 mesh peat powder can absorb heavy metal mercury (Hg) by 50%; Peat powder size of 60 mesh can absorb 75% of the heavy metal mercury (Hg).Keywords: activated carbon; peat; heavy metals; mercury
Aktivitas Antibakteri Ekstrak Rumput Laut Eucheuma spinosum Segar dari Perairan Pulau Nain Sulawesi Utara Lena Jeane Damongilala; Fitje Losung; Verly Dotulong
JURNAL ILMIAH SAINS Volume 21 Nomor 1, April 2021
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (428.074 KB) | DOI: 10.35799/jis.21.1.2021.33881

Abstract

Penelitian terhadap ekstrak metanol, fraksi etil asetat, dan fraksi butanol dari rumput laut Eucheuma spinosum menggunakan metode Disc Diffusion Test dilakukan untuk mengetahui peranannya sebagai antibakteri Escherichia coli ATCC 25922, dan Staphylococcus aureus ATCC 6538. Sebagai kontrol digunakan ekstrak (negatif) pelarut metanol, dan Amoxicilin. Konsentrasi sampel uji ditetapkan 10.000 ppm. Hasil pengujian menunjukkan adanya  aktivitas antibakteri yang ditandai dengan terbentuknya zona hambat terhadap bakteri Escherichia coli ATCC 25922.  Besarnya zona hambat secara berurutan untuk ekstrak metanol, fraksi  butanol, dan fraksi etil asetat, ialah : 6,98 mm, 7,85 mm, dan 7,88 mm.  Nilai zona hambat tersebut, relatif sama untuk setiap sampel uji. Sampel uji juga menunjukkan terdapat aktivitas antibakteri, ditandai dengan terbentuknya zona hambat terhadap bakteri Staphylococcus aureus ATCC 6538.  Besarnya zona hambat secara berurutan untuk ekstrak metanol, fraksi  butanol, fraksi etil asetat,  dan kontrol negatif pelarut metanol, ialah : 7,42 mm, 14.40 mm, 7,90 mm, dan 6,75 mm.  Zona hambat fraksi butanol lebih tinggi dibanding yang lain, ini menunjukkan bahwa aktivitas antibakteri Staphylococcus aureus pada fraksi butanol lebih tinggi dibanding fraksi lainnya.Kata kunci:  Antibakteri;  Eucheuma spinosum;  Escherichia coli; Staphylococcus aureus Antibacteria Activities of Extract Sea Algae  Eucheuma spinosum Fresh from Nain Island Waters North Sulawesi  ABSTRACTA research on antibacterial activity of methanol extract, ethyl acetate, and butanol fraction from Eucheuma spinosum seaweed using the disc diffusion method to know the role as  antibacterial activity was tested against Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 6538. Methanol was used as negative control while amoxicillin was used as positive control. The concentration of the test sample was set at 10,000 ppm. The antibacterial activity was indicated by the formation of an inhibition zone against the tested microorganisms. The inhibition zones against E.coli for methanol extract, butanol fraction, and ethyl acetate fraction were 6.98 mm, 7.85 mm, and 7.88 mm, respectively.  The value of the zone of inhibition is relatively the same for each sample.  In addition, the inhibition zones of methanol extract, butanol and ethyl acetate fraction against Staphylococcus aureus were 7.42 mm, 14.40 mm, 7.90 mm, and 6.75 mm, respectively. The inhibition zone of the butanol fraction is higher than the others, this indicated that the antibacterial activity for butanol fraction is higher than other fractions. Keywords: Antibacterial activity; Eucheuma spinosum; Escherichia coli; Staphylococcus aureus

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