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Jurnal Ilmu Dasar
Published by Universitas Jember
ISSN : 24425613     EISSN : -     DOI : https://doi.org/10.19184/jid.v24i2.36657
Core Subject : Education, Engineering,
Control & Systems Engineering Mathematics
Jurnal ILMU DASAR (JID) is a national peer-reviewed and open access journal that publishes research papers encompasses all aspects of natural sciences including Mathematics, Physics, Chemistry and Biology. JID publishes 2 issues in 1 volume per year. First published, volume 1 issue 1, in January 2000 and avalaible in electronically since 2012 with ISSN 1411-5735 (Print) and avalaible in electronically since 2012 with ISSN 2442-5613 (online). Jurnal ILMU DASAR is accredited SINTA 3 by the Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia (Kemendibukristek) No. 152/E/KPT/2023 (September 25, 2023), Ministry of Research, Technology and Higher Education of the Republic of Indonesia (RISTEKDIKTI), No. 200/M/KPT/2020 (December. 23, 2020). All accepted manuscripts will be published worldwide JID has been indexed in DOAJ, Dimension, OCLC WorldCat, PKP Index, Crossref, Google Scholar, Base, Garuda, and OneSearch. JID have been collaborated in KOBI-ID (Konsorsium Biologi Indonesia) and HKI (Himpunan Kimia Indonesia) since 2017.
Arjuna Subject : Matematika - Kontrol dan Optimasi
Articles 12 Documents
 1   2 
Search results for , issue "Vol 8 No 2 (2007)" : 12 Documents clear
Production and Characterization of Enzyme β-Endoxylanase from Bacteria of Termite-intestinal System A. A. Istri Ratnawati; Wuryanti Handayani; Ni Nyoman Tri Puspaningsih
Jurnal ILMU DASAR Vol 8 No 2 (2007)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.567 KB)

Abstract

A mesophile bacteria isolated from intestinal systems of local-soil termite, produced an extracellular β-endoxylanase upon growth on xylan. Optimum production of the enzyme was found in media containing oatspelt xylan at 37oC after sixth hours. The activities of its β-endoxylanase on oat-spelt xylan was investigated. It had an optimum pH and temperature, 5.0 and 40o C, respectively. However, pH stability occurred between 5.08.0. The enzyme was stable at 40o C for four hours and possessed a half life of four hours. β-endoxylanase had an apparent molecular mass of 45.000 to 66.200 Dalton as determined by SDS-PAGE. Analysis of zymogram using SDS-Xylan-PAGE indicated that enzymes could degrade oat-spelt xylan as substrates.
Functionalization of Polyethylene Films With pH-Responsive Acrylic Acid Using Grafting Technique Induced by UV-Ray Irwan Ginting Suka; Wasinton Simanjuntak
Jurnal ILMU DASAR Vol 8 No 2 (2007)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (186.966 KB)

Abstract

This research was carried out to study photografting of acrylic acid onto linear low-density polyethylene (LLDPE) film, induced by UV ray at 60°C, as a function of monomer concentration and irradiation time.  This research was conducted since it has been known that hydrogels formed by polyacrylic acid exhibit shrinking and swelling behaviors according to the change in pH of the aqueous medium. Therefore, the acrylic acid-grafted LLDPE film is expected to exhibit a pH-responsive function, in which it swells in alkaline media (pH = 8) and shrinks in acidic media (pH = 4).  Xanthone was used as a photoinitiator, which was coated on the film earlier. The samples were characterized using attenuated total reflection infrared spectroscopy and a scanning electron microscope analysis. The pH-responsive experiments revealed that the samples exhibited the pH-responsive characters, as expected, in which they shrank and swelled in acidic and alkaline media, respectively. The pHresponsive character was higher for the samples prepared in the system containing monomer at higher concentration. The different extents of the pH-responsive character of the resulting grafted PE films were discussed in terms of location of grafted chains in the film substrate.

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