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Jurnal Natur Indonesia
Published by Universitas Riau
ISSN : 14109379     EISSN : 25030345     DOI : http://dx.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 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.
Arjuna Subject : Biokimia, Genetika dan Biologi Molekuler - Biokimia, Genetika dan Biologi Molekuler (Lain-Lain)
Articles 15 Documents
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Search results for , issue "Vol 13, No 2 (2011)" : 15 Documents clear
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (243.101 KB) | DOI: 10.31258/jnat.13.2.168-173

Abstract

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.
Matriks atas Aljabar Max-Plus Interval Rudhito, Marcellinus Andy; Wahyuni, Sri; Suparwanto, Ari; Susilo, Frans
Jurnal Natur Indonesia Vol 13, No 2 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.728 KB) | DOI: 10.31258/jnat.13.2.94-99

Abstract

This paper aims to discuss the matrix algebra over interval max-plus algebra (interval matrix) and a method tosimplify the computation of the operation of them. This matrix algebra is an extension of matrix algebra over max-plus algebra and can be used to discuss the matrix algebra over fuzzy number max-plus algebra via its alpha-cut.The finding shows that the set of all interval matrices together with the max-plus scalar multiplication operationand max-plus addition is a semimodule. The set of all square matrices over max-plus algebra together with aninterval of max-plus addition operation and max-plus multiplication operation is a semiring idempotent. As reasoningfor the interval matrix operations can be performed through the corresponding matrix interval, because thatsemimodule set of all interval matrices is isomorphic with semimodule the set of corresponding interval matrix,and the semiring set of all square interval matrices is isomorphic with semiring the set of the correspondingsquare interval matrix.
Medium Term Conservation of Several Carnation Accessions Via in Vitro Culture Budiarto, Kurniawan; Marwoto, Budi
Jurnal Natur Indonesia Vol 13, No 2 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (49.629 KB) | DOI: 10.31258/jnat.13.2.174-177

Abstract

Sufficient genetic diversity is important in carnation breeding program. In vivo conservation of carnation germplasmis considered inefficient due to some technical and economical aspects. In vitro conservation was then, expectedto overcome the limitation of in vivo method. The research was conducted to find out the proper media for medium-term in vitro conservation of several carnation accessions in low temperature storage. A complete factorialexperiment with 25 replications was designed to accomplish the combination of two factors. The first factor wassix commercial carnation cultivars, namely Pink Maladi, Orange Triumph, Opera, Tundra, Yellow Liberty and PradoReffit. The second factor was the conservation media i.e. 1⁄2MS + DMSO 3% and 1⁄2MS + 3% DMSO + 3% sucrose andcontrol (MS 0+3% sucrose). The results showed that in vitro conservation of carnation in low temperature weresuccessfully conducted using 1⁄2MS+3% DMSO and 1⁄2MS+3% DMSO+3% sucrose without significant variation in allaccessions tested up to 10 and 12 months respectively. The increase of death plantlets, however, was detected onthe media of 1⁄2MS+3% DMSO after 6 months storage with significant decrease in viability hereafter. The existenceof sucrose in DMSO media induced root formation and plantlet resistance to low temperature storage.
Inhibisi Lipase Pankreas secara In Vitro oleh Ekstrak Air dan Etanol Daun Asam Jawa (Tamarindus indica) dan Rimpang Kunci Pepet (Kaempferiae rotundae) Pradono, Dyah Iswantini; Darusman, Latifah Kosim; Susanti, Ai
Jurnal Natur Indonesia Vol 13, No 2 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.355 KB) | DOI: 10.31258/jnat.13.2.146-154

Abstract

Tamarind and kunci pepet has been used traditionally as herbal medicine to reduce body weight or used asantiobesity. But the mechanism in vitro of this herbal in reducing body weight has not been known yet. Theobjective of this research is to evaluate these herbal as antiobesity by their water and ethanol extracts capabilityin inhibiting pancreatic lipase activity in vitro at pH 8, incubation time 45 minutes, and temperature 400C. Pancreaticlipase used in this research was human pancreatic lipase with concentration of 1.4 × 10-5 μg/μl and the substratewas sesame oil with concentration of 16.2 μg/μl. The water and ethanol extracts of tamarind leaves containedalkaloids, flavonoids, saponins, steroids, and tannins. Water extract of kunci pepet contained alkaloids, flavonoids,saponins, and tannins, while ethanol extract contained alkaloids, flavonoids, saponins, and triterpenoids. Theresults of tamarind leaves extracts showed that ethanol extract in concentration of 150 ppm had the highestinhibitory effect, with the value of 49.0%. Water extract of kunci pepet at concentration of 200 ppm had the highestinhibition, with the value of 65.1%. These values were higher than inhibitory effect of Xenical® 100 ppm as thepositive control, with the inhibition value of 10.6%.
Efek Penambahan Aditif Golongan Karboksilat dalam Menghambat Laju Pembentukan Endapan Kalsium Sulfat Suharso, Suharso; Buhani, Buhani
Jurnal Natur Indonesia Vol 13, No 2 (2011)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (72.805 KB) | DOI: 10.31258/jnat.13.2.100-104

Abstract

Scale formation is a serious problem encountered in many industries including oil or gas production, watertransport, power generation and batch precipitation. Several additives used have been known to inhibit scaleformation. This method is used because it is cheaper and effective in inhibiting scale formation. At this research,it was invesigated the effect of additional additive from carboxyl groups like citric acid, oxalate acid, and benzoicacid as inhibitor of kalsium sulfate (CaSO4) scale formation using conductivity method at temperature of 400C. Theresult showes that additives used are able to inhibit kalsium sulfate (CaSO4) scale formation under this condition.

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