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Jurnal Biologi Universitas Andalas
Published by Universitas Andalas
ISSN : -     EISSN : 23032162     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology
Arjuna Subject : -
Articles 10 Documents
 1 
Search results for , issue "Vol 4, No 2 (2015)" : 10 Documents clear
Isolasi, Karakterisasi dan Potensi Bakteri Endofitik dari Tanaman Zodia (Evodia suaveolens Scheff) sebagai Penghasil Antibiotika Melisa Ainil Fajri; Anthoni Agustien; Periadnadi Periadnadi
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

Endophytic bacterium are important to produce antibiotic. We have experimentally studied zodia plant (Evodia suaveolens Scheff) in attempting to isolate and characterize the bacterium. We have also examined potentiality of each isolate to produce antibiotic. We obtained three a isolate of  endophytic bacterium that produce antibiotic compounds. Among three isolates, two could form high inhibition zone. MZS-01 formed 10.4 mm inhibition zone against Eschericia coli, while MZS-03 formed 6.96 mm inhibition zone against Staphylococcus aureus. We described the isolates MZS-01 and MZS-03 based on macroscopis and microscopis characteristic of colony  culture.
Karakterisasi Mikroflora Alami Saluran Pencernaan Sapi Potong Sebagai Kandidat Probiotik Pakan Sapi Potong Uswatul Hasana; Nurmiati Nurmiati; Periadnadi Periadnadi
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

The research about the "Characterization of Natural Microflora From Cow Digestic Tract As Candidate For Cattle Feed Probiotics"  has been conducted from April to July 2013 in the Laboratory of Microbiology, Department of Biology, Faculty of Mathematics and Natural Sciences, University of Andalas, Padang. This study aimed to obtain isolates  and the character of each isolate as a candidate to cattle feed probiotics. This study used an experimental method and analyzed descriptively. The result showed that the bacteria from cow digestive tract were Cellulolytic (110x107cfu/g), Fermentative (85x107cfu/g),  Amylolytic (31x107cfu/g) and Proteolytic (28x107cfu/g) bacteria. Two of  the probiotic candidate were bacill and coccus, both of them were Gram-negative and catalase positive.
Pertumbuhan Rumput Kerbau (Paspalum conjugatum Berg.) yang Diinokulasi Beberapa Dosis Fungi Mikoriza Arbuskular (FMA) pada Media yang Mengandung Merkuri (Hg) Putri Seti Ayu; Zozy Aneloi Noli; Solfiyeni Solfiyeni
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

The research about the growth of Buffalo Grass (Paspalum conjugatum Berg.) inoculated with several doses of Arbuscular Mychorrizal Fungi (AMF) ) in Media Containing with Mercury (Hg) had been done from February to July 2014 at the greenhouse, Plant Physiology and Tissue Culture Laboratory, Biology Department, Faculty of Mathematic and Natural Science and Environmental Laboratory, Faculty of Engineering, Andalas University. The aims of the research to know ability of P. conjugatum inoculated with several doses AMF in media containing with mercury and find the best dose of AMF for growh of P. conjugatum. The research used a Completely Randomized Design with five treatments and five replications. The treatments were control 0, 5, 10, 15, 20 g  AMF. The result showed that no effect inoculated of AMF up to 20 g to the height, number of leaves and dry weight of P. conjugatum.
Uji Mulsa Organik Terhadap Gulma Dan Produksi Kacang Hijau (Phaseolus radiatus L.) Martha Aulia Reyndi; Chairul Chairul; Zuhri Syam
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

We experimentally studied the effect of organic mulches on weeds and yield of green beans (Phaseolus radiatus L.) have been conducted at green house and Laboratory of Plant Ecology, Departement of Biology, Faculty of Natural Sciences, Andalas University, Padang, from January to May 2014. The aims of this study were to determine the effect of different mulches (Mikania micrantha and Tithonia diversifolia) on weeds and yield of green beans. The experiment used nested design with eight treatments and three replications. The first factor (factor A) was two kinds of mulch (i.e Mikania micrantha and Tithonia diversifolia). While the second factor (factor B) was the given doses of mulch (i.e 0 g/polybag, 300 g/polybag, 600 g/polybag and 900 g/polybag). The results showed that Mikania micrantha mulch gave the stronger effect to reduce weed numbers. Mikania micrantha mulch on 900 g/polybag increased plant height and Mikania micrantha mulch on 300 g/polybag increased seed yield. Whereas Tithonia diversifolia mulch on 600 g/polybag increased plant height and the number of primary branches and Tithonia diversifolia mulch on 300 g/polybag increased seed yield.
Efektivitas Insektisida Komersial Terhadap Kecoak Jerman (Blattella Germanica L.) Strain VCRU-WHO, GFA-JKT dan PLZ-PDG dengan Metode Kontak (Glass Jar) Wulan Rahfi Madona; Resti Rahayu; Dahelmi Dahelmi; Nova Hariani
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

The purposes of this study was to find out the effectiveness of commercial insecticides to German cockroaches. Study was conducted from September to November 2013 in the Laboratory of Animal Physiology, Department of Biology, Andalas University. This study used the contact method (glass jar) with three strains of German cockroaches (VCRU–WHO, GFA-JKT and PLZ-PDG) and five kinds of insecticide (ByWS, HtWS, MtWS, RdWS, and VpWS). The average of knockdown time and lethal time were counted with a probit analysis. The effectiveness category divided into two groups, value of knockdown time and lethal time were needed to be achieved in a certain time. The results showed that based on the value of knockdown time 90% (KT90), effective aerosol insecticide to knockdown the German cockroach is aerosol insecticide ByWS, HtWS and VpWS. Aerosol insecticide MtWS was only effective to knockdown the German cockroach VCRU-WHO strain and ineffective for GFA-JKT and PLZ-PDG strains. Aerosol insecticide RdWS was only effective to knockdown the German cockroach VCRU-WHO and GFA-JKT strains, ineffective for PLZ-PDG strain. Based on the lethal time 90% (LT90)  there was no single insecticide effective to kill German cockroach.
Komunitas Algae Epilitik Sebagai Indikator Biologis Di Sungai Batang Ombilin, Sumatera Barat Indah Yusliga Sari Purba; Izmiarti Izmiarti; Solfiyeni Solfiyeni
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

A study about community of epilithic algae was conducted on April until August 2014. The objective of this study was to clarify composition and structure of epilithic algae in Ombilin River and water quality of Ombilin River based on community of epilithic algae. Samples were collected by survey and brushing method and the research station was choosed 6 stations purposively. The results showed that totally 72 genera had been found with total density of epilithic algae was 388.92ind/cm2to 2139.04 ind/cm2. The highest density of epilithic algae was found in station III (Talawi) and the lowest in station II (Lubuk Pinang). The dominant epilithic algae were Cocconeis, Synedra, Navicula, Denticula and Gomphonema (Baccilariophyta), Stigeoclonium (Chlorophyta), Phormidium and Calothrix (Cyanophyta), Ceratium (Dinophyta) and Audouinella (Rhodophyta). Diversity index was 1.50 to 2.48, where the highest was observed at station II (Lubuk Pinang) and the lowest one at station III (Talawi). Equitability index was 0.42 to 0.68. Similarity index was 50 to 74.70%. Saphrobic coefficient was 0.61–1. The result also showed that Ombilin Riverwere polluted slightly byorganic and inorganic materials in β-mesosaprobic phase.
Pertumbuhan Bibit Hopea mengarawan Miq. Pada Intensitas Cahaya Berbeda Elfans Bawalsyah S.A.; Suwirmen Suwirmen; Zozy Aneloi Noli
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

An experimental study on growth of Hopea mengarawan Miq. seedlings under different light intensity was conducted from June to October 2012 at open field. This experiment aimed to find out optimal light intensity for the growth of H. mengarawan seedlings. The study used completely randomized design with four treatments and six replications. The treatments were control (100), 80, 60 and 40% of light intensities. The result showed  light intensity did not give significant effect to the growth of H. mengarawan seedlings.
Isolasi dan Karakterisasi Bakteri Amilotermofilik Dari Sumber Air Panas Sungai Medang Rahmadani Eka Pitri; Anthoni Agustien; Fuji Astuti Febria
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

The research on isolation and characterization of amylothermophilic bacteria has been done in Research Laboratory of Microbiology, Biology Department, Mathematics and Natural Sciences Faculty, Andalas University, Padang. The aimed to obtain amylothermophilic isolate and describe their characteristic. The study used purposive sampling method and descriptive analysis. The study results obtained four amylothermophilic isolates with amylolitic index ranged from 2.23 until 3.51 were different macroscopic characters, rod shape, motile and produce catalase enzyme, three isolates  were  Gram positive and spore forming, one isolate was  Gram negative.
Komposisi dan Struktur Komunitas Fitoplankton di Danau Diatas Kabupaten Solok Sumatera Barat Muhammad Ikhsan; Izmiarti Izmiarti; Indra Junaidi Zakaria
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

A study on community of phytoplankton in Diatas lake was conducted from April to September 2014. This study aimed to describe composition and structure of phytoplankton of the lake. We sampled phytoplankton at 6 stations purposively using plankton net that hauled vertically. We  found 70 species of phytoplankton those belong to five classes, i.e. Bacillariophyceae (33 species), Chlorophyceae (27 species), Cyanophyceae (5 species), Dinophyceae (3 species) and Euglenophyceae (1 species). Total density of phytoplankton ranged from 881.06 to 3,196.02 ind/l. The highest density was at Station VI (Teluk Kinari) and the lowest one was at Station III (Muaro). Phytoplanktons with higher relative density (RD > 5 %) were Melosira italica, Synedra ulna, Melosira granulata (Bacillariophyceae), Staurastrum cereates, Chlorella vulgaris and Spirogyra fluviatis (Chlorophyceae). Shannon-Wiener Diversity index of phytoplankton (H`) ranged from 1.30 to 1.71 with the highest diversity index was at Station IV (Batang Hari) and the lowest was at Station V (central lake). Equitability index (E) was ranged from 0.39 to 0.57. Similarity index among stations were low which ranged from 34.48  to 62.50%.
Aklimatisasi Planlet Kantong Semar (Nepenthes gracilis Korth.) pada berbagai Campuran Media Tanam Tanah Ultisol Rio Febrianto; Suwirmen Suwirmen; Syamsuardi Syamsuardi
Jurnal Biologi Universitas Andalas Vol 4, No 2 (2015)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jbioua.4.2.%p.2015

Abstract

The research about Acclimatization of Pitcher Plant (Nepenthes gracilis Korth.) Planlet on Variety of Mixed Planting Medium Ultisol Soil had been conducted from May to August 2014 in Greenhouse and Plant Physiology Laboratory Department of Biology, Faculty of Natural Sciences, Andalas University. This study aimed to determine the influence of the media composition on the growth of seedlings of Nepenthes gracilis Korth. This study used completely randomized design (CRD) method with 5 treatments and 5 replications. The treatments of planting medium were consisted of A. Ultisol soil (control), B. Ultisol soil : manure : sand (1:1:1), C. Ultisol soil : manure : husk (1:1:1), D. Ultisol soil : manure : sand (2:1:1) and E. Ultisol soil : manure : husk (2:1:1). The results showed that treatment A i.e. ultisol soil (control) was the best growing medium for Nepenthes seedlings growth during acclimatization.

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