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

11 12 13 14 15

Studies on Structural and Magnetic Properties in Co/Sm Multilayers Erwin, Erwin
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Co/Sm multilayer films with structure of 20 [Co (x nm)/Sm (1.2 nm)] where x = 1.1, 2.2 and 4.2 nm and 20[Co (4.2nm)/Sm (x nm)] where x=1.2 nm to 7.5 nm were fabricated using dc magnetron sputtering. Each multilayer filmconsisted of 20 bilayers of Co layers with various thicknesses sandwiched with Sm layers. The application of lowangle X-ray diffraction measurements to the characterization of these multilayers is described. The periodiclayered structure with sharp interfaces was observed for all multilayer films. The measured magnetization valuesare lower than the values calculated in terms of the nominal concentration of cobalt in the multilayers. This impliessignificant “mixing” at small film thickness. The formation of a high magneto crystalline anisotropy of CoSm alloyat the interfaces, as a result of interdiffusion between Co and Sm layers was considered to be responsible for theincrease of the coercivity for Co/Sm multilayer.

Aktivitas Antimalaria Daun Erythrina variegata Herlina, Tati; Supratman, Unang; Subarnas, Anas; Sutardjo, Supriyatna; Abdullah, Noor Rain
Jurnal Natur Indonesia Vol 10, No 1 (2007)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.10.1.36-41

The leaves of Erythrina variegata (Leguminosae) used tradisional plant of an antimalarial. In the course of our continuing search for novel an antimalarial compound from Erythrina plants, the methanol extract of the leaves ofE. variegata showed significant antimalarial activity in vitro toward Plasmodium falciparum in vitro using the lactate dehydrogenase (LDH) method. The methanol extract of the leaves of E. variegata showed against bothstrains of parasite with IC50of 6.8 ?g/ml against K1 and > 60 ?g/ml against 3D7, respectively. The methanol extract of the leaves of E. variegata was separated by using bioassay-guide fractionation. The n-buthanol fraction yieldedthe most activity, exhibiting equipotency against both strains of parasite with IC50of 5.1 ?g/ml against K1 and 13.5 ?g/ml against 3D7, respectively. Furthermore, by using the antimalarial activity to follow separation, the n-buthanol fraction was separated by combination of column chromatography to yield an active compound. The active compound showed antimalarial activity against both strains of parasite used with IC50 of 4.3 ?g/ml against K1 and 23.5 ?g/ml against 3D7, respectively. Its inhibition of the resistant strain (K1) was also much better compared to its inhibition of the sensitive strain (3D7), indicated that the leaves of E. variegata to be potential as antimalarial agents, but its lower potency compared to artemisinin and chloroquin.

Analisis Efektifitas Tepung Jamur sebagai Larvasida Aedes aegypti Yasmin, Yekki; Fitri, Lenni; Bustam, Betty Mauliya
Jurnal Natur Indonesia Vol 14, No 1 (2012)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

This research is about effectivity analysis of two kinds of fungi i.e. Beauveria bassiana and Metharrizium anisopliae as Aedes aegyptilarvacide, it has been conducted at laboratories Zoology in Biology Department, Mathematics and Natural Sciences Faculty, Syiah KualaUniversity. Aims of this research were estimating maximum time storage of fungi powder as effective larvacide and the number of bacteriacolonies were found in water used for experiment. This research was used Completely Randomized Design (CRD). The experiments consistof two factors i.e kind and saving time of fungi. The result show that the longer the storage time of Beauveria bassiana the more ineffectiveit was as larvacide and the least fungi colonies were found. Metharrizium anisopliae on the other hand, the longer it was kept, the moreeffective it was as larvacide and the more fungi colonies were found.

Pengaruh Ukuran Embriozigot terhadap Regenerasi Beberapa Klon Kakao Avivi, Sholeh; Restanto, Didik Pudji; Widyastuti, Tri
Jurnal Natur Indonesia Vol 13, No 3 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

This sesearch identified the responses of size of zygotic embryo of cocoa and to identify the responses of cocoaclone types toward ability to produce somatic embryo. The research was designed by Completely RandomizedFactorial Design within five replications. The first factors were the sizes of used explants, namely small (2-5 mm),average (6-9 mm) and big (10-15 mm). The second factors were cocoa clones, namely RCC 72, Sca 6, KW 162, KW163 and KW 165. The result showed that the best explant was the small size (2-5 mm) of cocoa zygotic embryo. Ithad significantly on number of rooting embryos and number of embryos with buds on rooting media. Clone RCC 72was the most responsive clone and could generate to be plantlet. Clone KW 165 performed the lowest response.

Improvement of Selected Induction Culture Media on Callus Induction in Anther Culture of Anthurium and a Histological Study on its Callus Formation Winarto, Budi; Mattjik, Nurhayati Ansori; Purwito, Agus; Marwoto, Budi
Jurnal Natur Indonesia Vol 12, No 2 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Improvement of selected induction culture media on callus induction in anther culture of anthurium and a histologicalstudy on its callus formation were studied at the tissue culture laboratory of the Indonesian Ornamental CropsResearch Institute from February to October 2008. The objectives of the study were to optimize selected media forcallus formation, reveal cell origin of callus derived from anther culture and shoot formation process. Selectedmedia improved in the study were 1) MMS-TBN containing 0,5 mg/l TDZ, 1,0 mg/l BAP and 0,01 mg/l NAA (Winartomedium, WM) and 2) MMS III supplemented with 1,5 mg/l TDZ, 0,75 mg/l BAP and 0,02 mg/l NAA (Winarto andRachmawati medium, WRM). Improvement treatments were carried out by omission and application of 2,4-D in 0.5mg/l and reduction of medium strength of full, half, quarter, one eighth, one sixteenth, and zero strength. Afactorial experiment was arranged using a randomized complete block design with four replications. Results ofthis study indicated that the highest callus induction was clearly established in WRM. The medium stimulatedpotential growth of anther (PGA) up to 81% with 49% of percentage of anther regeneration (PAR) and 2.7 number ofcallus formed per replication (NCF). Significant improvement in callus formation was also recorded by reduction ofmedium strength of WRM to one eighth compared to others. The reduction induced PGA up to 58% with 29% of PARand 1.8 NCF. From histological studies it was well recognized that regenerated callus on half anthers cultured wasoriginated from middle layer cells of anther wall. The morphogenic response of anther wall cells caused primarilyon no androgenesis effect in microspore cells.

Faktor-Faktor yang Mempengaruhi Produksi Biodiesel dari Minyak Sawit Mentah Menggunakan Katalis Padat Kalsium Karbonat yang Dipijarkan Awaluddin, Amir; ', Saryono; Nelvia, Sri; ', Wahyuni
Jurnal Natur Indonesia Vol 11, No 2 (2009)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The demand for petroleum has increased recently due to the increase of world population, industries andtransportation. Biodiesel (fatty acids methyl esters) has become attractive because of high price of petroleum,limited recourses of crude oil, and environmental concerns. Most biodiesel is produced by transesterification oftriglycerides of refined/edible type oils using methanol and homogeneous catalyst such NaOH and KOH. The useof heterogeneous calcined CaCO3 catalyst, has advantages such as the ease of phase separation betweencatalyst and biodiesel. This paper presents factors affecting the synthesis of biodiesel from crude palm using thecalcined CaCO3 catalyst . The synthesis is carried out by two steps, the acid-catalyzed pre-esterification of free-fatty acid and followed by base-catalyzed transesterification of triglycerides. A study of optimizing the reactioncondition of the esterification followed by transesterification of crude palm oil (CPO) is performed to obtainmaximum production of biodiesel. Under conditions of catalyst calcination temperature of 9000C, reactor time of1.5 hours, catalyst dosage of 1,5%, reaction temperature of 700C and methanol/oil molar ratio of 9 : 1, the oilconversion is 74,6%. The as-synthesized biodiesel meets the requirements of Indonesian National Standard (SNI)for biodiesel.

Penapisan Bakteri Simbion Gastropoda Stramonita armigera Penghasil Senyawa Antibakteri Multi Drug Resistant dari Perairan Ternate Pringgenies, Delianis; Dananjoyo, Mijil Ciptaning
Jurnal Natur Indonesia Vol 13, No 3 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Antibiotic resistance is an ability of bacteria to hold the antibiotic effect. It was reported that there is a human-patogen bacteria that resistance to one or more classes of antibiotic. It become a problem on medical world. Tosolve those problems, it is necessary to search the new antibiotic compounds that more effective and efficient tosolve the problem of Multi Drug Resistance (MDR). The secondary metabolite-producing marine invertebrates andsymbiont microorganisms, have prospect as an antibiotic. The symbiont microorganisms may produce thesecondary metabolite similar to their host. The aims of the reseach were to determinate of gastropods symbiontbacteria that capable of producing Antibacterial MDR (Multi Drugs Resistant) Compound. Sample of Molusc werecollected from Ternate (Molucas) islands. Isolation of symbiotic bacteria, screening for bacteria which producingsecondary metabolites as anti-MDR bacteria, antibacterial test, isolation of clinical pathogenic bacteria (MDR),conducting anti-bacterial sensitivity test, sensitivity test for antibacterial, DNA exctraction, DNA amplificationbased on PCR method, DNA sequencing. Result of 16S r-DNA sequence was then analyzed and edited usingGENETYX program and followed by 16S rDNA sequence analysis. The result showed that 17 strains were isolatedfrom gastropods Stramonita armigera. Antibacterial assays showed that TSA 8.7 isolate have ability to inhibitPseudomonas sp., Escherichia coli dan Enterobacter sp. the molecular analyses showed that isolate TSA 8.7closed by related to Vibrio sp. Strain JZDN1, with 98% of homology. Based on this experimental result, it could beconcluded that gastropods-symbiont bacterium Stramonita armigera capable of producing antibacterial compoundagainst strain Multi Drug Resistant (MDR). There is 11 isolates of gastropods-symbiont bacteria Stramonita armigerathat have an antibacterial MDR activity.

Karakteristik Jamur Sagu (Volvariella sp.) Endemik Papua Abbas, Barahima; Listyorini, Florentina Heningtyas; Martanto, Eko Agus
Jurnal Natur Indonesia Vol 13, No 2 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Sago mushrooms (Volvariella sp.) were known as edible mushroom which grow sporadically on decay of sagopith waste in Papua. Local people in Papua always hunting and harvesting sago mushrooms which are growingwild on decayed sago pith waste. People were enjoyed consumption of sago mushrooms. The aims of this researchwere to study nutrient contents of sago mushrooms as well as to distinguish the difference of morphologicalcharacters between sago mushroom and paddy straw mushroom which popular in Indonesia. Sago mushroomswere collected from Yapen regency, Papua Province and measured for their nutrient contents and morphologicalcharacteristics. The results of this research showed that morphological characteristic of sago mushroom differfrom paddy straw mushroom and other edible mushroom. Nutrient contents of Sago mushroom per 100 gramsfresh weigh were follows: protein 4.00 g, carbohydrate 2.99 g, lipid 0.19 g, calcium 11.53 mg, phosphorous 0.31 g,and potassium 165.05 mg. Nutrient contents of sago mushroom were very different from that of paddy strawmushroom and others mushrooms of the genus Volvariella. Based on morphological characteristic and nutrientcontents of Sago mushrooms, we suggest that sago mushrooms is a new species.

Identifikasi Genetik Mutan Talinum paniculatum JACQ. (GAERTN.) Berdasarkan Marka RAPD Poerba, Yuyu Suryasari
Jurnal Natur Indonesia Vol 12, No 1 (2009)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Javasom Talinum paniculatum Jacq. (Gaertn.) is one of popular vegetable plants with potential medicinal properties.The plant root is often used as a substitute for ginseng (Panax ginseng L.), and the leaves are used as a vegetableand as a substitute for purslane (Portulaca olaraeae L.). An effort to improve genetic quality of the plant was madethrough induced mutation with ethyl methane sulphonate (EMS). A variety of EMS dosages (0, 0.3%, 0.6%, 0.9%,1.2%, 1.5% dan 1.8%) were applied to javasom seeds to induce mutation for 24 hours at room temperature. Selectedfive putative mutant genotypes of the third generation after mutagen treatment (M3) was analyzed using Ramdomamplified polymorphic DNA (RAD) marker. Twenty RAPD primers generated 185 scorable bands with 78.92% ofthem were polymorphic. Size of the bands varied from 200bp to 2.5kbp. Clustering analysis was performed basedon RAPD profiles using the UPGMA method. The range of genetic distance among individual genotypes was fromfrom 0.31 to 0.58, while genetic variance was 0.29 + 0.17. The five genotypes were proof to be solid mutants.

Micro Propagation of Several Potted Anthurium Accessions Using Spathe Explants Budiarto, Kurniawan
Jurnal Natur Indonesia Vol 11, No 1 (2008)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

The introduction of new varieties and production system of anthuriums has faced some problems due to the lowmultiplication rates in conventional vegetative and genotypic alteration problem in reproductive propagation. Sincethen, in vitro propagation technique became important to be investigated. The research was carried out fromSeptember 2006 to August 2007 at the Indonesian Ornamental Crops Research Institute. A complete factorialexperiment was designed to accomplish two chronological in vitro activities. The first step dealt with differentincubation sites, i.e. dark and light conditions for callus induction of three potted anthurium accessions, namelyclone no. SM. 001, cv. Alphine and cv. Bonito. The best callus obtained from the incubation treatment were then,transferred into defined media with different formulations to get free-callus plantlets in the second steps. Theresults showed that more progressive callus development from spathe explant was detected on the media ofmodified Nitsch and Nitsch + 1 mg/l 2,D + 1 mg/l Kin + 1 mg/l BA stored at dark after 60 days incubation. After 45days transferring the callus in the same media on light conditions, torpedo-shaped callus was detected. Completeplanlets were obtained after 75 days reculturing the buds in Nitsch and Nitsch medium containing 2,4 D withvarious BA concentrations. Clone SM. 001 and cv. Bonito showed higher number of visible shoot and rootdevelopments compared to cv. Alphine. In general, better shoot and root developments and higher planlets survivedafter acclimatization were observed on the BA concentrations of 2 and 3 mg/l.

Page 13 of 31 | Total Record : 306

11 12 13 14 15

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