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Reni Ambarwati
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sainsmatematika@unesa.ac.id
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Jurusan Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam Gedung D1 Kampus UNESA Ketintang Surabaya Kode Pos 60213 E-mail: sainsmatematika@unesa.ac.id Telp : 031-8280009
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Sains dan Matematika
Published by Universitas Negeri Surabaya
ISSN : 23027290     EISSN : 25481835     DOI : -
Core Subject : Science, Education,
Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Jurnal ini menerbitkan artikel asli hasil penelitian di bidang biologi, fisika, kimia, dan matematika. Redaksi hanya menerima naskah asli yang belum pernah dipublikasikan dan tidak sedang dalam proses penerbitan di jurnal lain. Naskah dapat ditulis dalam bahasa Indonesia, sesuai dengan ejaan yang baik dan benar atau bahasa Inggris yang baik dan benar.
Arjuna Subject : Umum - Umum
Articles 5 Documents
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Search results for , issue "Vol. 2 No. 2 (2014): April, Sains " : 5 Documents clear
Adsorpsi Rhodamin B dengan Adsorben Kitosan Serbuk dan Beads Kitosan Mardiyah Kurniasih; Anung Riapanitra; Anas Rohadi
Sains dan Matematika Vol. 2 No. 2 (2014): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Chitosan is a biopolymer that has adsorption ability toward dye substances due to its amino and hydroxyl functional groups. Thisstudy aimed to synthesize chitosan and chitosan beads from jerbung shrimp shell, and to test their adsorption ability on rhodamine Bdye. The chitosan and chitosan beads product of the synthesis were characterized using Fourier Transform Infra-Red Spectrophotometer(FTIR) as well as the determination of water content, ash content, and swelling effect. The adsorption ability of chitosan and chitosanbeads on rhodamine B was tested using the parameters of maximum wavelength as well as the effect of variation of pH and contact time.The results of the study showed that the synthesis gave result to chitosan and chitosan beads with water content of 4.45% and 6.84%, ashcontent of 0.1% and 2.83%, and the swelling effect of 143.43 and 94.05%, respectively. Chitosan and chitosan beads adsorb rhodamineB optimally at pH 4 and 3 with a contact time of 120 and 180 minutes, respectively at a maximum wavelength of 554.2 nm.
Ekspansi Cantor dan Perluasannya Sanjung Nova; Raden Sulaiman
Sains dan Matematika Vol. 2 No. 2 (2014): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

This article discuss Cantor set, Cantor expansion and extended of Cantor expansion. These expansions are another ways toexpress a number except decimal system and binary system. How to express a natural number with Cantor expansion and extendedof Cantor expansion are discribed too. Some examples are given and we proved that Cantor expansion is special case of extended ofCantor expansion.
Sifat Mekanik Beton Polimer Epoksi dengan Pengisi Partikel Nanokalsit-silika Nugrahani Primary Putri; Diah Hari Kusumawati; Lydia Rohmawati
Sains dan Matematika Vol. 2 No. 2 (2014): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

Polymer concrete environmentally friendly by utilizing the waste has been developed, one with waste mussel shells and sidoarjomud. Utilization of the waste is not optimal, for it to be used as filler in polymer concrete waste will be expected to have a highereconomic value. This research aimed to utilize the waste of cockle's shells and sidoarjo mud as filler of polymer concrete. Both waste firstsynthesized into nano particles by taking calcite and silica alone (mussel shells into nanocalsite and sidoarjo mud into nanosilica), beforebeing used as a filler. Once formed nanocalsite and nanosilica, composites with epoxy resin matrix and filler nanocalsite and nanosilicacreated by varying the percentage weight of each filler 5-10% by weight. Then the characterization was conducted in the form of tensiletest, hardness, bending and impact test. The test results showed that the resulting polymer concrete has physical properties, mechanical,thermal and microscopic good and has an optimum value at 10% filler calcite + 10% silica, which is 218.39 MPa compressive strength,tensile strength of 3.32 MPa, a strong fracture of 8.04 MPa and hardness values ranged from 16.08 to 18.3 HVN. Overall the resultshave met the standards for the characterization of polymer concrete.
Konvergensi Global Metode Spectral Conjugate Descent yang Baru Menggunakan Pencarian Garis Armijo yang Termodifikasi Dahliatul Hasanah
Sains dan Matematika Vol. 2 No. 2 (2014): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

The new nonlinear spectral conjugate descent method is constructed by combining the spectral conjugate gradient method andconjugate descent method. This method generates descent direction dk. Under the strong Wolfe rule this method is globally convergent.This paper analyzed global convergence of this method using the modified Armijo line search. The result shows that the new nonlinearspectral conjugate descent method is globally convergent under the modified Armijo line search.
Aktivitas Antibakteri Isolat Bakteri yang Berasosiasi dengan Spons Demospongiae dari Pantai Paciran Lamongan Oki W.D Judianti; M.M Fiqri; M.K Ansyori-KM; Guntur Trimulyono
Sains dan Matematika Vol. 2 No. 2 (2014): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

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Abstract

The sponges are potential to associate with bacterial isolates producing antibacterial compounds. This study was conducted toisolate and test the antibacterial activity of bacterial isolates associated with Demospongiae (Spongia sp. and Hippospongia sp.) fromPaciran Beach, Lamongan. Isolation of bacteria was done by using the pour plate method then purified by using the streak plate method.The antibacterial assay were conducted by using Escherichia coli FNCC 0091 and Staphylococcus aureus 0047 FNCC based on welldiffusion assay. There were 38 isolates of bacteria associated with sponges and two of them revealed the antibacterial activity againstE. coli FNCC 0091, while four other isolates showed antibacterial activity against S. aureus FNCC 0047. The isolates were B413, B48,B47, B410, B52, and B53. B48 has the highest antibacterial activity against E. coli FNCC 0091 and the inhibition zone diameter was37 mm, while B52 has the highest antibacterial activity against S. aureus FNCC 0047 and the inhibition zone diameter was 31 mm.

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