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Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Published by Universitas PGRI Palembang
ISSN : 1829586X     EISSN : 25810170     DOI : -
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Chemistry Mathematics Physics
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam with registered number ISSN 1829 586X (print) and ISSN 2581-0170 (online) is a scientific journal managed and published by Faculty of Mathematics and Natural Science, Universitas PGRI Palembang. Sainmatika Journal publishes research articles from laboratory or field experiment as well as theoretical and elaborative research in field of Basic Sciences; Mathematics, Chemistry, Physics and Biology. This journal accepts articles in Indonesian or English. This journal is published twice a year in June and December.
Arjuna Subject : -
Articles 13 Documents
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Search results for , issue "Vol. 19 No. 2 (2022): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam" : 13 Documents clear
Padat Populasi Wereng Batang Coklat (Nilaparvata lugens) dan Wereng Hijau (Nephotettix virescens ) pada Tanaman Padi Varietas Inpara 2 di Kampung Bokem Kabupaten Merauke Papua Jefri Ando Sembiring; Johanna A Mendes
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 19 No. 2 (2022): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v19i2.9321

Abstract

The purpose of this study was to analyze the population density and intensity of attack of Brown Planthopper (Nilaparvata lugens Stall) and green leafhoppers (Nephotettix virescens) on rice plants of Inpara 2 variety in Bokem Village. The research was conducted from August to October 2022 in the rice fields of Bokem Village, Merauke District. Sampling was carried out on three rice fields with an area of 20 x 40 m divided by five observation sub-plots spread diagonally with a size of 2 x 2 meters. Plant height of Inpara 2 variety at the age of 14 DAP (23.1 cm), 28 DAP (33.2 cm), 42 DAP (53.8 cm), 56 DAP (64 cm) and 70 DAP (70.2 cm) . The number of tillers at the age of 14 days old (3.2 tillers), 28 days old (5.5 tillers), 42 days old (11 tillers) and 56 days old (12.1 tillers). The panicle length of the Inpara 2 rice variety was on average (21.1 cm) while the weight of 1000 grains was 14.7 grams. Brown planthopper population at the age of 14 days after planting (0.19 individuals), 28 days after birth (0.07 individuals), 42 days after birth (0.19 individuals) and 56 days after planting (0.31 individuals) while the green leafhopper population at 14 days old (0.30 individuals) 32 individuals), 28 days old (0.33 individuals), 42 days old (0.25 individuals) and 56 days old (0.01 individuals). Keywords: Pest, Inpara 2, Population,  Brown planthopper, green leafhoppers
Pemanfaatan Elektrolit Air Laut Sebagai Sumber Energi Listrik Baterai Dengan Elektroda Tembaga - Aluminium Zuffa Anisa; Dyah Setyaningrum
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 19 No. 2 (2022): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v19i2.9583

Abstract

Electrical energy demand is increasing from time to time. Most sources of electrical energy come from petroleum, natural gas, and coal. Even though this energy source is non-renewable, the amount is dwindling, and it produces carbon emissions that can cause the greenhouse effect. Indonesia is an agrarian country whose territory is more than seventy percent of the ocean. Natural resources: seawater and beach sand are certainly very abundant. In this study, this natural material is used by researchers as a source of electrical energy in the form of a battery. As far as researchers know, research on the manufacture of battery cells by direct use of natural resources does not yet exist. Much is preliminary research on the extraction of basic materials so almost all research on batteries costs a lot of money by methods that are not simple. Therefore, this research is very important, because it uses a simple assembly method which is certainly time-saving and cost-effective. The battery array made consists of [Cathode || Electrolyte + Microporous Separator || anode]. The seawater-salt water battery cells made successfully turn on the lights, both LED lamps, and home light bulbs, with a large current generated of 13.56mA. The voltage produced by a battery cell is 1.31 V, while the series voltage for 2-3 batteries is 2.55 V and 3.6 V, respectively.
Pemanfaatan Limbah Kulit Pisang Raja Nangka sebagai Capping Agent Sintesis Partikel ZnO: Variasi Pelarut Ekstraksi Nuril Mega Musfita; Fauziatul Fajaroh; Adilah Aliyatulmuna; Endang Ciptawati; Yahmin Yahmin; Nazriati Nazriati
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 19 No. 2 (2022): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v19i2.9135

Abstract

Kemunculan bakteri resisten antibiotik menjadi masalah serius di seluruh dunia. Upaya penanggulangan bakteri resisten antibiotik terus dilakukan, salah satunya dengan penggunaan material berukuran nano. Zink oksida (ZnO) merupakan salah satu partikel yang telah terbukti dapat menghambat pertumbuhan bakteri gram negatif dan gram positif. Dalam mencegah terjadinya aglomerasi pada sintesis ZnO berukuran nanometer dapat ditambahkan capping agent alami berupa senyawa metabolit sekunder pada ekstrak kulit pisang raja nangka. Adapun langkah yang dilakukan adalah: 1) ekstraksi metabolit sekunder kulit pisang raja nangka, 2) uji fitokimia, 3) penentuan kadar total flavonoid dan polifenol, 4) sintesis ZnO dengan capping agent alami ekstrak kulit pisang raja nangka, 5) karakterisasi ZnO, dan 6) uji aktivitas antibakteri ZnO. Hasil analisis kualitatif melalui uji fitokimia serta analisis kuantitatif melalui penentuan kadar total polifenol dan flavonoid menunjukkan bahwa ekstrak kulit pisang raja nangka etanol (96%)-air 2:1 (v/v) memiliki kadar metabolit sekunder yang lebih tinggi dibandingkan ekstrak kulit pisang raja nangka etanol (96%)-air 1:1 (v/v). Partikel ZnO berhasil disintesis menggunakan capping agent alami ekstrak kulit pisang raja nangka. Kadar metabolit sekunder yang berbeda pada masing-masing ekstrak mempengaruhi ukuran, morfologi, dan aktivitas antibakteri ZnO hasil sintesis.

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