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Contact Name
Titania T Nugroho
Contact Email
titania.nugroho@lecturer.unri.ac.id
Phone
+62811764031
Journal Mail Official
natur@ejournal.unri.ac.id
Editorial Address
Gedung LPPM Universitas Riau Jl. HR Subrantas Km 12,5 Pekanbaru 28293
Location
Kota pekanbaru,
Riau
INDONESIA
Jurnal Natur Indonesia
Published by Universitas Riau
ISSN : 14109379     EISSN : 25030345     DOI : http://dx.doi.org/10.31258/jnat
JURNAL NATUR INDONESIA terbit sejak tahun 1998, merupakan jurnal ilmu sains yang menyajikan artikel mengenai hasil penelitian, pemikiran dan pandangan dari peneliti dan pakar dalam bidang biosains (ilmu dasar), meliputi biologi, fisika, kimia dan matematika. Jurnal Natur Indonesia melibatkan mitra bestari yang menelaah setiap artikel sesuai dengan bidang ilmunya. Nama dan asal institusi mitra bestari tersebut tercantum pada halaman bagian normor 2 dari setiap volume penerbitan. Jurnal ini diterbitkan setahun dua kali, pada bulan April dan Oktober.
Articles 15 Documents
Search results for , issue "Vol 13, No 1 (2010)" : 15 Documents clear
New Records of Seagrass Flora in Air Bangis West Sumatera Kamal, Eni; Bujang, Japar Sidik; Zakaria, Muta Hara
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (82.377 KB) | DOI: 10.31258/jnat.13.1.77-81

Abstract

Seagrasses in the Air Bangis Archipelago, west coast of Sumatra were found growing in sandy muddy substratesof the shallow coastal waters at depth of 0.3-2.5 m, dominated by degraded coral reefs around the off-shoreislands. Two species; Enhalus acoroides (L.f) Royle and Thalassia hemprichii (Ehrenb) Aschers were observed atPulau Unggas, Pulau Pasir Panjang and Teluk Tapang. Halodule uninervis (Forssk) Aschers was observed in twolocations; Pasir Panjang and Teluk Tapang. The occurrence of this species is unknown previously and therefore itis a new flora record for Sumatra. With this new record, Sumatra has six species of seagrasses, contributing tohalf of total number of seagrasses occurring in Indonesia. According to leaf width measurements, two morphologicalvariants (narrow and wide leaved) can be distinguished for Halodule uninervis. In addition, descriptions of thespecies and their habitat characteristic are provided.
Analisis Parameter Fisik, Kimia, Biologi, dan Daya Dukung Lingkungan Perairan Pesisir Untuk Pengembangan Usaha Budidaya Udang Windu di Kabupaten Barru Rustam, Rustam
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (138.358 KB) | DOI: 10.31258/jnat.13.1.33-40

Abstract

The regency of Barru is a potential region for Tiger prawn cultured in the South Sulawesi Province. Generally, thisaquaculture activity is based on the application of intensively cultivated pattern by using artificial feed as a sourceof the prawn foremost meal. Some research suggested that an intensive pattern of prawn cultured generatessome waste products that are significantly to affect such physical, chemical as well as biological parameters ofcoastal water condition. That the change in environmental quality of coastal water will affect commercial tigerprawn that is the role of water to support sustainable cultured through its carrying capacity. This research wasaimed to analyze physical, chemical and biological parameters of coastal water and to ensure its carrying capacityin maintaining commercially tiger prawn cultured. The results are expected to be some more valuable referencesfor the benefit of the development of tiger prawn aquaculture. The research was conducted in the coastal waterfrom June to December 2007. Observation was made in order to find out physical, chemical, and biological factorsthroughout the stations (i.e., sea, coastal, pond, estuaria and the outlet of the farm stations). To examine thephysical, chemical and biological parameter of spatial characteristic, a Principal Component Analysis (PCA) wasused. The used approaches to determine carrying capacity were based on capacity and receivance ability ofwaters and oxygen content. The results of this research show that the entirely physical and chemical parametersof coastal water of the Barru regency were exceeded that of the requirement thresholds of the total suspendedsediment (TSS) and the chemical oxygen demand (COD). A spatial distribution of physical and chemicalcharacteristics was measured high by TSS and COD, as well as the level of water turbidity, all at the outflow ofestuaria and the Outlet; meanwhile, the value of NO2, Phosphate, and NH3 substances was recorded high at thepond. A biological parameter was characterized by the existence of phytoplankton through its density and abundanceas well. Those of the Class Bacyllariophyceae was dominantly encountered to attain at the top as high as 75.2% inspecies composition, followed by Cyanophyceae 9.3% at the second, and the rest Chlorophyceae 8.9% andDyanophyceae and Euglenophyceae 5.9% and 0.7% respectively. Based on the stationed preferences, those in thecoastal, the pond, and the Outlet were dominated by Bacyllariophyceae, whereas the estuaria by Cyanophyceae.The Shannon’s index of diversity (H’) of the entirely stations was varied among 1.01 – 2.12 that the lowest one at theestuaria and the highest at the sea. The coastal water has its carrying capacity to support the excess of 506,437kg organic waste substances based on the necessity of oxygen content suspending in the water column. Therefore,the given pond is feasible to develop to reach as much as 219 Ha intensive ponds, or 481 Ha semi-intensive pondson the other way.
Identifikasi Molekuler Begomovirus Penyebab Penyakit Kuning Keriting pada Tanaman Cabai (Capsicum annum L.) di Sumatera Barat Trisno, Jumsu; Hidayat, Sri Hendrastuti; Jamsari, Jamsari; Habazar, Trimuri; Manti, Ishak
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (360.888 KB) | DOI: 10.31258/jnat.13.1.41-46

Abstract

Pepper plants showing Begomovirus-like symtoms, consisting of yellowing, leaf curling, and distortion, werecollected from fields located in the Padang, West Sumatra. The aim of this research is to identification ofbegomovirus associated with yellow leaf curl diseases on pepper. Total DNA was extracted from infected leaftissue according to Doyle and Doyle (1999) with slight modification. Polymerase chain reaction (PCR) was used toamplify the coat protein region of the virus using universal degenerate primers pAV494 and pAC1048. The PCRamplified DNA product (approx. 560 bp) was sequenced. The nucleotide and amino acid sequences and BLASTsearch revealed highest homology with pepper yellow leaf curl Indonesia virus isolated pepper, tomato andAgeratum conyzoides from Java, but differences from those of tomato yellow leaf curl virus. The isolate was thententatively called pepper yellow leaf curl Indonesia virus-Padang (PYLCIV-Pdg).
Retrieved Optical Thickness for Analyzing The Aerosol and Cloud Properties Using Lidar Remote Sensing Dewang, Syamsir
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (146.788 KB) | DOI: 10.31258/jnat.13.1.7-12

Abstract

The lidar remote sensing is the one important application to observe the aerosol and cloud of the atmosphere. Themicropulse lidar (MPL) return signals were studied in the tropical area. In this investigation, the single scatteringis analyzed by the physical properties of aerosol and cloud. The signal simulation of the single scattering predictsthe maximum optical thickness by saturation. It was observed that saturation optical thickness from the lidarsignal depends on the variation of extinction coefficient. This simulation is compared by the optical thicknessestimation from the lidar data. The MPL data (at wavelength of 523 nm) was determined, and the sky radiometer (atwavelength 500 nm) was used as reference data. The maximum optical thickness of lidar was 2.6 at night time,and the maximum optical depth of lidar and sky radiometer data on the same day were 2.25 and 1.7, respectively.
Karakter Root Re-Growth Sebagai Parameter Toleransi Aluminium pada Tanaman Padi Roslim, Dewi Indriyani; Miftahudin, Miftahudin; Suharsono, Utut; Aswidinnoor, Hajrial; Hartana, Alex
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (96.048 KB) | DOI: 10.31258/jnat.13.1.82-88

Abstract

Aluminum (Al) is one of the major limited factors in crop production on acid soils. Aluminum tolerant plants can beselected from plant breeding program by one of the physiological parameters representing Al tolerance character,such as root re-growth capability during recovery from the Al-stress. In this study we determined the concentrationand time exposure of Al stress that was able to differentiate the response of three local upland rice varieties(Grogol, Hawarabunar and Krowal) and an Al-sensitive rice variety (IR64) to Al-stress, and evaluated the effectivenessof root re-growth (RRG) characters as an Al tolerance parameter in rice. The study consisted of three experiments,which were 1) nutrient culture experiment with different Al concentration treatments in growth chamber, 2) potexperiment in greenhouse using Jasinga yellow red podzolic acid soil containing 26,66 me/100 g Al and pH 4,6 asplanting media, and 3) phenotyping of F2 population using RRG character. The results showed that Al treatment at15 ppm for 72 h was able to distinctly differentiate between Al-tolerant (Grogol and Hawarabunar) and Al-sensitivevarieties (Krowal and IR64). Planting of the rice varieties on acid soils showed similar result as that of the nutrientculture. Phenotyping of F2 population using RRG character indicated the existence of RRG value variation. Thesevariations demonstrated that RRG character can be used as an Al tolerance parameter in rice and therefore can beeffectively applied to screen rice F2 population that segregate to Al tolerance character.
Perilaku Disolusi Ketoprofen Tersalut Gel Kitosan-Karboksimetilselulosa (CMC) Sugita, Purwantiningsih; Achmadi, Suminar Setiati; Yundhana, Yuyu
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.958 KB) | DOI: 10.31258/jnat.13.1.21-26

Abstract

Study dissolution behaviour of ketoprofen through optimum chitosan-CMC microcapsule has been carried out. Into228.6 ml of 1.0% (w/v) chitosan solution in 1% (v/v) acetic acid, 38.1 ml of CMC solution was added with concentrationvariation of 0.075; 0.0875; and 0.10% (w/v). Afterwards, 7.62 mL of glu was added slowly under stirring, withconcentrations varied: 3; 4.5; and 6% (v/v). All mixtures were shaked for 20 minutes for homogenization. Into eachmicrocapsule mixture for ketoprofen, a solution of 2 g of ketoprofen in 250 mL of 96% ethanol was added. Everymixture was then added with 5 ml of 2% Tween-80 and stirred with magnetic stirrer for an hour at room temperature.Conversion of suspension into fine powders/granules (microcapsules) was done by using spray dryer. Thedissolution behaviour of optimum ketoprofen microcapsules were investigated in gastric and intestinal medium.Microcapsule morphology before and after dissolution as well as empty microcapsule (blank) were observed withSEM. Spray drying process had successfully coated ketoprofen in chitosan-CMC microcapsule. Optimization byusing Minitab Release 14 software showed that among the microcapsule compositions studied, CMC and glu of0.0925% (w/v) and 3.01% (v/v), respectively, optimum to coat ketoprofen at constant chitosan concentration 1.0%(w/v). Result of SEM morphology and In vitro dissolution profile showed that ketoprofen in chitosan-CMCmicrocapsule was relatively well than chitosan-guar gum microcapsule. Kinetically, dissolution of ketoprofen frommicrocapsule in intestinal pH condition was first order with release rate constant, k, of 7.285 ï‚´ 10-4 % min-1 andrelease half-time, t1/2, of approximately 15 hours.
Penghambatan Ekstrak Etanol Sereh (Cymbopogon citratus (DC) Stapf ) terhadap Produksi Verotoksin Escherichia coli Verotoksigenik Cepeda, Gino Nemesio; Hariyadi, Ratih Dewanti; Supar, Supar
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (58.97 KB) | DOI: 10.31258/jnat.13.1.72-76

Abstract

Citronella was a spicy plant used as seasoning in Indonesian food. It was reported to have antimicrobial activity. Itsextract in form of volatile oil prepared by distilation can inhibit the growth of some bacteria. The objective of theresearch was to know the inhibition of ethanolic extract of the citronella on growth and verotoxin production ofverotoxigenic Escherichia coli. The assay of antimicrobial activity was done by using broth dilution and verocellassay. The results indicated that minimum inhibitory concentration of extract can inhibit effectively verotoxinproduction of verotoxigenic Escherichia coli.
Construction of a DNA Vaccine Using Glycoprotein Gene and Its Expression Towards Increasing Survival Rate of KHV-Infected Common Carp (Cyprinus carpio) Nuryati, Sri; Alimuddin, Alimuddin; Sukenda, Sukenda; Soejoedono, Retno Damayanti; Santika, Ayi; Pasaribu, Fachriyan Hasmi; Sumantadinata, Komar
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (120.942 KB) | DOI: 10.31258/jnat.13.1.47-52

Abstract

Deoxyribonucleic acid (DNA) vaccine has recently been developed as an alternative vaccine against virus infection.This study was the first step of DNA vaccine development to protect cyprinids including common carp (Cyprinuscarpio) and fancy koi (Cyprinus carpio) from KHV (koi herpesvirus) infection in Indonesia. One of KHV glycoproteingenes, i.e. glycoprotein (GP) was ligated with Japanese medaka (Oryzias latipes) â-actin promoter to generatepAct/GP as a DNA vaccine. Fourty fish in body weight of 10-15 g/fish were individually injected by pAct/GP intomuscle in different dosage of 2.5 μg, 7.5 μg and 12.5 μg/100 μl phosphate buffer saline. Total RNA was extractedfrom the 12.5 μg of pAct/GP-injected fish muscle at 24, 48 and 67 hours post-injection to analyze GP expression byRT-PCR method. Potential of pAct/GP as DNA vaccine was examined by injecting KHV into the 30-days-vaccinatedfish. Both of possitive and negative control fish group were not vaccinated. Possitive control fish group wereinjected with KHV, but negative control fish group were not. KHV-challenged fish were reared for 1 month, and thedeath fish were calculated daily. Result of RT-PCR analysis showed that GP gene expression were detected at 3 dpost-injection. Expression of GP in the vaccinated fish groups helped to improve their survival rate after challengedby KHV. All of fish without DNA vaccination had dead 17 days after KHV injection. The results demonstrated thatpAct/GP had high potency to be used as a DNA vaccine against KHV infection in cyprinids.
Suhu dan Waktu Inkubasi untuk Optimasi Kandungan Eksopolisakarida dan Fitohormon Inokulan Cair Azotobacter sp. LKM6 Hindersah, Reginawanti; Sudirja, Rija
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (59.034 KB) | DOI: 10.31258/jnat.13.1.67-71

Abstract

Azotobacter inoculation could play an important role to enhance the effectiveness of bioremediation since bacterialexopolysachharides form a complex with heavy metal. So that metal mobility in soil and its uptake by plantsincreased. Azotobacter also produce phytohormone which induce roots growth and subsequently the uptake ofnutrients. The objective of this research was to obtain optimal incubation temperature and time in Azotobacter sp.LKM6 liquid inoculants production in the fermentor to maximize the synthesis of exopolysachharides andphytohormones. The experiment arranged in Completely Randomized Design consisted of two incubationtemperature (room temperature and 300C). At 24, 36, and 48 hours incubation, the concentration of EPS andphytohormone cytokinin and giberrelin were occurred. The experimental results were 1) the best temperature andincubation time to produce Azotobacter sp. LKM6 liquid for bioremediation of heavy metal-contaminated soil was30oC and 48 hours, and 2) inoculants production at 300C for 48 jam produce liquid inoculants containing 2.87mg L-1 exopolysachharides, 81.0 mg L-1 cytokinins and 18.7 mg L-1 giberrelin, and 13.12 x 108 cell ml-1.
Pembuatan Membran Polimer Elektrolit Berbasis Polistiren Akrilonitril (SAN) untuk Aplikasi Direct Methanol Fuel Cell Suka, Irwan Ginting; Simanjuntak, Wasinton; Dewi, Eniya Listiani
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (309.762 KB) | DOI: 10.31258/jnat.13.1.1-6

Abstract

In this study, electrolyte membranes based on polystyrene acrylonitrile (SAN) for Direct Methanol Fuel Cell applicationwere prepared. The preparation was carried out in two steps. The first step was introduction of additives, silicaand zeolite, as reinforcing agent on SAN, to obtain silica-reinforced SAN membrane, specified as SAN-Si, andzeolite-reinforced SAN membranae, specified as SAN-Z. The two reinforced membranes were then subjected tosulphonation using sulphuric acid, and the sulphonated membranes are specified as S-SAN-Si and S-SAN-Z,respectively. The characteristics of the membrane were described in terms of the degree of sulphonation, ionicconductivity, methanol permeability, and percentage of swelling in water and methanol. The results obtaineddemonstrated that additives result in significant reduction of methanol crossover, as reflected by lower values ofmethanol permeability than that obtained for the membrane without additive. It was also found that zeolite functionsrelatively better than silica. For zeolite-modified membrane (S-SAN-Z) the ionic conductivity of 10.05 x 10 -6 S/cmwas achieved. The membrane also marked by methanol permeability of 0.52 x 10 -6, percentage of swelling of 5.12%in water and 2.58% in methanol. Thermal analysis using DSC technique revealed changes in glass transition fromthe original sample, in which the glass transition of the original sample, SAN, (55 0C), sulphonated SAN, S-SAN,(83.360C), silica-modified membrane S-SAN-Si (79.860C), and zeolite-modified membrane S-SAN-Z (79.290C). Additionof additive was also found to influence the surface characteristics of the membranes as revealed by SEM analysis,in which the surface changed from smooth for the original sample into rough for the reinforced samples with bothadditives.

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