Garuda - Garba Rujukan Digital

All

Jurnal Natur Indonesia

JN
Website

Published by Universitas Riau

ISSN : 14109379 EISSN : 25030345 DOI : https://doi.org/10.31258/jnat

Core Subject : Science, Agriculture, Engineering,

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry

Jurnal Natur Indonesia published since 1998, is a science journal that presents articles on research results, thoughts and views from researchers and experts in the field of biosciences (basic science), including biology, physics, chemistry and mathematics. In the field of biosciences (basic science); Biology, Physics, Chemistry, Mathematics.

Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)

Articles 306 Documents

1 2 3 4 5

Daya Antibakteri Ekstrak Etanol Ketepeng Cina (Senna alata) terhadap Staphylococcus aureus dan Escherichia coli secara In Vitro Yacob, Taswin; Endriani, Rita
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The benefit and efficacy of ketepeng cina (Senna alata) in the treatment of infection has shown that have antibacterialactivity, inhibiting and killing bacteria that cause infection. The objective of this study was evaluate the antibacterialactivity of ketepeng cina against Staphylococcus aureus dan Escherichia coli in vitro. This study was a laboratoryexperimental research which use completely randomized design with diffusion method. Ethanol extract of Sennaalata leaves devided into 4 doses, i.c. 100, 50, 25 and 12.5. Amoxiclave were used as positive control and aquadestnegative control. The data were analyzed by Analysis of Varian continued with Duncan’s Multiple Range Test. Theresult of this study showed that antimicrobial activity of ethanol extract Senna alata leaves inhibited the growth ofStaphylococcus aureus, but not Escherichia coli. The optimum effect was showed given by the concentration 100at 17.7 mm.

Pemanfaatan Minyak Daun Cengkeh untuk Sintesis 3,4-dimetoksibenzil Sianida sebagai Bahan Dasar Sintesis Isoflavon Alimuddin, Andi Hairil; Matsjeh, Sabirin; Anwar, Chairil; Mustofa, Mustofa
Jurnal Natur Indonesia Vol 15, No 1 (2013)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

This research was aimed to utilize eugenol isolated from clove leave oil in the synthesis of isoflavones. Eugenol was usedas a raw material by converting into 3,4-dimethoxybenzyl cyanide through several stages of reactions. These stages weremethylation of eugenol, isomerization of methyleugenol, oxydation of methylisoeugenol, reduction of 3,4-dimethoxybenzaldehyde, halogenation of 3,4-imethoxybenzyl alcohol and nitrilization of 3,4-dimethoxybenzyl chloride to3.4-dimethoxybenzyl cyanide. Methylation of eugenol using dimethylsulfate and NaOH catalyst produced methyleugenolin 93.60% purity. Isomerization of methyleugenol employing base of potassium tertiary butoxide (t-BuOK) in dimethylsulfoxide (DMSO) gave methylisoeugenol with 87.15% yield and 98.10% purity. Oxidation of methylisoeugenol usingpotassium dichromate (K 2 Cr 2 O 7 ) was performed catalyst transfer phase (CTP) system of polysorbate 80 to 83.40% 3.4-dimethoxybenzaldehyde yield and 90.20% purity. Reduction of 3.4-dimethoxybenzaldehyde with sodium borohidrat (NaBH 4 )produced 98% yield. Halogenation of 3,4-dimethoxybenzyl alcohol by SOCl 2 to 3,4-dimethoxybenzyl chloride followed bynitrilisation using sodium cyanide produced 3.4-dimethoxybenzyl cyanide with 83.90% purity after reflux for 20 hours.

Pengaruh Vitamin C terhadap Peningkatan Hemoglobin (Hb) Darah dan Kelulushidupan Benih Ikan Kerapu Bebek (Cromileptes altivelis) Siregar, Yusni Ikhwan; Adelina, Adelina
Jurnal Natur Indonesia Vol 12, No 1 (2009)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

This research was conducted from Maret until June 2008, in Big Hall of Development Marine Aquaculture Lampung.The research used experimental methodology, with 4 treatments and 3 replications. The aimed of research are toknow effects of vitamin C to increase a haemoglobin of blood and survival rate and measured effective C vitaminin prawn of humback grouper. The result showed that the highest haemoglobin rate of at PC (2 g/kg prawn), equalto 0,915 g/100 mL. The lowest haemoglobin found at treatment PA. equal to 0,066 g/100 mL. Result of variansianalysis indicate that addition of vitamin C at food give influence to increase the haemoglobin rate (P<0.05).Survival rate after experiment are 100 %. Parameter of water quality of were: temperature 29.3-30.2 oC, pH 7.81-8.27, salinitas 31-32 psu, DO 3,65-5 mg/L, and ammonia content (NH 3) 0.044-0.069 mg/1

Aktivitas Peroksidase Mutan Pisang Kepok dengan Ethyl Methane Sulphonate (EMS) secara In Vitro 1 Yanti, Yulmira
Jurnal Natur Indonesia Vol 14, No 1 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The activity of peroxidase were observed in leave of banana clone Kepok resulting by treatments EMS. The phenotype of peroxidase wasanalyzed from the banana clones resulting the induced by EMS and without induction after inoculated with pathogen Banana Blood deasesBacterium (BBD). The objectives of research are know variation of activity and band pattern of peroxidase. Induced mutation treatmentsconsist of control, 0.2% EMS for 1 and 3 hours, 0.5% for 1 and 3 hours, each treatments was provided five banana clones. The result showedthat variant value and coefisien variant of peroxidase activity in leaf tissue of clone treated by EMS increased compare to the control. Avariant control is 0.28 with coefisien variant is 29.92%, while variant value of treatment is 8.45 with coefisien variant is 75.75%.Appearance of peroxidase bands on clone resulting by EMS treatments were emerged four band pattern. The first and control band patternhas relative migration distance is 20 and 30, the second 15, 40 and 60, the third is 15, 35 and 50. There are four bands with different relativemigration distance that indicated polymorphic.

Teknologi Fragmentasi Buatan Karang (Caulastrea furcata dan Cynarina lacrimalis) dalam Upaya Percepatan Pertumbuhan pada Kondisi Terkontrol Zulfikar, Zulfikar; Soedharma, Dedi
Jurnal Natur Indonesia Vol 10, No 2 (2008)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The objective of research were analyze water quality condition of water circulation system at laboratory and tomeasured growth survival rate of Caulastrea furcata and Cynarina lacrimalis which was fragmented at laboratory.Fragmentation treatment of Caulastrea furcata become 1, 2, 3, and 4 polyp that was rearing on circulation systemdid not give significant impact on height and length growth after 160 days rearing and fragmentation of Cynarinalacrimalis on circulation system give significant impact. Mean of growth length of Caulastrea furcata on treatment1, 2, 3 and 4 polyp in every month after 160 days was 1.64 mm, 1.55 mm, 1.42 mm , and1.08 mm whereas growthbroad was 0.71 mm, 0.82 mm, 0.51 mm, 0.62 mm, and mean of growth length Cynarina lacrimalis for the sametreatment in every month was 1.47 mm, 0.90 mm, 0.62 mm, 0.61 mm whereas growth broad was 1.57 mm, 1.16mm, 0.93 mm, 0.89 mm. Fragmentation treatment of Caulastrea furcata become 1 polyp was best length if compareother treatment and Cynarina lacrimalis was treatment became 2 devide.

Penggunaan Bahan Organik dan Kombinasinya dalam Formulasi Biofungisida Berbahan Aktif Jamur Trichoderma pseudokoningii Rifai. untuk Menghambat Jamur Ganoderma boninense Pat. secara in vitro Elfina, Yetti; Ali, Muhammad; Saputra, Rachmad
Jurnal Natur Indonesia Vol 16, No 2 (2016)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Trichoderma pseudokoningii has been applied as a biocontrol agent against fungal plant pathogen, such as Ganoderma boninense, the cause of stem rot disease on palm oil plants. To be more effectively applicable in the field, some experiments have been employed to formulate T. pseudokoningii in a biofungicide formulation amended with organic matter as its main nutrient resource, zealot as a carrier agent and cocoyam powder as a mixture agent. A research has been conducted to study the effect of various organic matters and their combinations in a biofungicide formulation of T. pseudokoningii on growth inhibition to G. boninense in-vitro and to obtain the best organic matters and their combinations in enhancing the growth of T. pseudokoningii and yet inhibiting G. boninense. The research has been conducted in the Laboratory of Plant Pathology, Agriculture Faculty, University of Riau from May to August 2012, using a completely randomized design consisting of 15 treatments (bagasse, rice husk, shrimp shell, dregs, and their combinations) and 3 replications. The data were statistically analyzed using analysis of variance, followed by Duncan’s New Multiple Range Test (DNMRT). The results indicated that organic matters and their combinations in the biofungicide formulation significantly affected the antagonistic capacity of T. pseudokoningii in inhibiting the growth of G. boninense in vitro. Rice husk, bagases, bagasse+rice husks, and bagasse+dregs were the best organic matters in enhancing the growth of T. pseudokoningii and its capacity to inhibit G. boninense in-vitro. It can also be concluded that shrimp shell, bagasse+shrimp shell, rice husk+shrimp shell, shrimp shell+dregs and rice husk+shrimp shell+dregs totally inhibited the growth of T. pseudokoningii in the biofungicide formulation.

Efektifitas Kitosan sebagai Inhibitor Korosi pada Baja Lunak dalam Air Gambut Erna, Maria; Emriadi, Emriadi; Alif, Admin; Arief, Syukri
Jurnal Natur Indonesia Vol 13, No 2 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

This research is intended to learn inhibition efficiency of mild steel corrosion in peat water using two type ofchitosan. First chitosan is without treatment and the second one is synthesized by ionotropic gelation method andthen is characterized by Fourier transform Infrared spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM).Diameter of chitosan porous is about 500 nm which is measured based on morphological photo using SEM withinhomogeneous porous shape and porous distribution is unsmooth . Effect of chitin and chitosan on the corrosionof mild steel in peat water is studied using weight loss method. It is found that corrosion inhibition efficiencydepends on peat water pH, inhibition technique and interaction time. The results show that inhibition efficiency ofchitosan without treatment and with treatment are 88.73% and 93.32% respectively. The inhibition is assumed tooccur via physicsorption of the chitin and chitosan molecules on the metal surface. The Langmuir adsorptionisotherm is tested for their fit to the experimental data.

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

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.

Desain dan Analisis Pengukuran Viskositas dengan Metode Bola Jatuh Berbasis Sensor Optocoupler dan Sistem Akuisisinya pada Komputer Warsito, Warsito; Suciyati, Sri Wahyu; Isworo, Dyan
Jurnal Natur Indonesia Vol 14, No 3 (2012)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

It has been designed and analyzed the low cost viscometer using falling ball method, the sample analyzed is glycerin fluid at 20oC. Two optocoupler circuits have been used as time measurement system of falling ball between two references point, light source used was infrared laser diode. The computer acquisition system use serial communication and it has been perfectly made and characterized. The velocity measurement system has 0.75 x 10-1 s resolution, but the resolution of integrated system both of hardware and acquisition software, is about 10-1 s. The theoretical viscosity value has been calculated and simulated to abtain the absolute viscosity value. This simulation results have been analyzed and compared with the experiment results. The correction factor for velocity calculation has been discussed and gave the optimum value of velocity correction factor (0.4425), regarding to the dimension of tube and ball used in this research. Based on the experiment, the viscosity of glycerin obtained was 1418.0309±1.6157 mPa.s., this value was with similar with the literatures and has a 0.57% of accuracy error (ε0).

ji Bioaktivitas Senyawa Glikosida dari Biji Keben (Barringtonia asiatica L. Kurz) Bustanussalam, Bustanussalam; Simanjuntak, Partomuan
Jurnal Natur Indonesia Vol 12, No 1 (2009)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The fruits or seeds of Keben (Barringtonia asiatica L. Kurz) were used traditionally for fish poisons, to curvestomach and headeach. The aim of this research was to isolate and identify bioactive compound of n-butanolfraction of active compound against Artemia salina Leach larvae. Isolation and purification of n-butanol fractionwere carried out by column chomatography (SiO2, CHCl3-MeOH) and high pressure liquid chromatography (RP,MeOH). The result of purification was than tested using BSLT methode. The test showed that, BABU-2.4 had thehighest activity with LC 50 value was 30.19 ppm. BABU-2.4 was identified with FT-IR spectrophotometer and NMR(proton and carbon) spectrophotometer as derivate of glicoside.

Page 1 of 31 | Total Record : 306

1 2 3 4 5

Filter by Year

2007 2024

Filter By Issues

All Issue Vol. 22 No. 2 (2024): October Vol. 22 No. 1 (2024): April Vol 21, No 1 (2023): April 2023 Vol 21, No 2 (2023): October Vol. 21 No. 2 (2023): October Vol. 21 No. 1 (2023): April Vol 20, No 2 (2022): Oktober 2022 Vol 20, No 1 (2022): April 2022 Vol 19, No 2 (2021): Oktober 2021 Vol. 20 No. 2 (2022): October Vol. 20 No. 1 (2022): April Vol 19, No 1 (2021): April 2021 Vol. 19 No. 2 (2021): October Vol. 19 No. 1 (2021): April Vol 18, No 2 (2020): oktober Vol 18, No 1 (2020) Vol 17, No 2 (2019) Vol 17, No 1 (2016) Vol 16, No 2 (2016) Vol 16, No 1 (2014) Vol 15, No 2 (2013) Vol 15, No 1 (2013) Vol 14, No 3 (2012) Vol 14, No 1 (2012) Vol 14, No 1 (2011) Vol 13, No 3 (2011) Vol 13, No 2 (2011) Vol 13, No 1 (2010) Vol 12, No 2 (2010) Vol 12, No 1 (2009) Vol 11, No 2 (2009) Vol 11, No 1 (2008) Vol 10, No 2 (2008) Vol 10, No 1 (2007) More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
Irwan Effendi

Contact Email
natur@ejournal.unri.ac.id

Phone
+62811764031

Journal Mail Official
kurniawanronal09@gmail.com

Editorial Address
Kampus Bina Widya KM. 12,5 Simpang Baru, Tampan, Pekanbaru 28293 Indonesia

Location
Kota pekanbaru,

Riau

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Irwan Effendi

Contact Email natur@ejournal.unri.ac.id

Phone +62811764031

Journal Mail Official kurniawanronal09@gmail.com

Editorial Address Kampus Bina Widya KM. 12,5 Simpang Baru, Tampan, Pekanbaru 28293 Indonesia

Location Kota pekanbaru, Riau INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Irwan Effendi

Contact Email
natur@ejournal.unri.ac.id

Phone
+62811764031

Journal Mail Official
kurniawanronal09@gmail.com

Editorial Address
Kampus Bina Widya KM. 12,5 Simpang Baru, Tampan, Pekanbaru 28293 Indonesia

Location
Kota pekanbaru,

Riau

INDONESIA