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Ronal Kurniawan
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INDONESIA
Jurnal Natur Indonesia
Published by Universitas Riau
ISSN : 14109379     EISSN : 25030345     DOI : https://doi.org/10.31258/jnat
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Physics
Jurnal Natur Indonesia has been published since 1998, is a science journal that presents articles on research results, thoughts and views from researchers and experts in biosciences (basic science), including biology, physics, chemistry and mathematics. Jurnal Natur Indonesia involves reviewers who review each article according to their field of knowledge. The names and institutional origins of the Reviewers are listed on the normal two pages of each volume of publication. The journal is published twice a year, in April and October. 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 84 Documents
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Bird Species Based on Tree Height Perched in the Liwa Botanical Garden, West Lampung Regency Bagus Susilo Putra; M. Kanedi; Nuning Nurcahyani; G. Nugroho Susanto
Jurnal Natur Indonesia Vol. 20 No. 1 (2022): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.20.1.9-14

Abstract

Birds are one of the most diverse animals in the world, especially in Indonesia. Liwa Botanical Garden located in Pekon Kubu Perahu, Balik Bukit District, West Lampung Regency, is a conservation area with the theme of conservation and development of ornamental plants, representing the flora of Southern Sumatra. This research is a continuation of the collaboration between the Department of Biology and Balitbang UPTD Liwa Botanical Garden, West Lampung Regency. The presence of birds in the Liwa Botanical Garden is also a bioindicator of biodiversity for the environment in this area. By maintaining the presence of birds in the Liwa Botanical Garden means protecting their habitat and existing plants. The purpose of this study was to determine the species of birds based on the height of the perched trees in the Liwa Botanical Garden and the abundance of their species. The method used in this research is the point count with the observation time for 9 days in the morning and evening at the height of the tree in 3 different observation stations. Birds on KRL are mostly found on perches at an altitude of 2 - 7 meters, in the category of shrubs and trees, there are 19 out of 25 bird species found. The highest Relative Abundance Index (IKR) was Collocalia esculenta at 39.91% and the lowest IKR value was 7 bird species, each with 0.14% value. The conservation status of the 25 bird species based on IUCN is Least Concern (LC) and based on CITES there is one species that is included in Appendix II, namely Ictinaetus malayensis while based on the Regulation of the Minister of Environment and Forestry of the Republic of Indonesia No. P.20 / MENLHK / SETJEN / KUM.1 / 6/2018 there is one bird species that is included in the protection, namely species Ictinaetus malayensis
The Effect of Tofu Dregs Compost and NPK Fertilizer the Growth and Production of Purple Eggplan (Solanum melongena L.) Arnis En Yulia; M. Amrul Khoiri; Sri Yoseva; Nuraida Nuraida
Jurnal Natur Indonesia Vol. 20 No. 1 (2022): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.20.1.15-23

Abstract

The research was aimed to see the effect interaction of giving tofu dregs compost and npk fertilizer to get the right dose towards growth and the highest production of purple eggplant. The research was conducted at Experimental Garden, Faculty of Agriculture, Riau University, Pekanbaru. The research was conducted for 5 months, from february to june 2020. The reasearch was conducted experimentally in 2 factors. The first factor was the of tofu waste compost consists of 3 levels (0, 10 and 20 ton.ha-1). The second factor was the of NPK fertilizer (0, 100 and 150 kg.ha-1) which consist of nine treatments combination. The observed parameterswere the height of the plant (cm), the days of flowering (days), the days of harvesting (days), the fruit length (cm), the fruit diameter (cm), the number of fruits per plant (fruit), the fruit weight per fruit (g), the fruit weight per plant (g) and the fruit weight with plot (g). The data in this research was analyzed in using variance and followed by Duncan's multiple distance test at 5% level. The results showed that tofu waste compost and NPK fertilizer increased the growth of eggplant such as the height of the plant, the days of flowering, the days of harvesting, the number of fruits per plant, the fruit length, the fruit weight per fruit, the fruit weight per plant and the fruit weight with plot and does not increase fruit diameter. The giving tofu waste compost at a dose 20 ton.ha-1 and NPK fertilizer 150 kg.ha-1 gave the best eggplant growth and production until the plants were 90 DAP
Types of Invasive Plants and Threats to Animal Conservation in National Park Bagus Susilo Putra
Jurnal Natur Indonesia Vol. 20 No. 1 (2022): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.20.1.24-29

Abstract

Invasive plants are plants that can interfere with other plant life because invasive plants use competition and harm the host they live on. Animal conservation is currently the focus of research so that biodiversity is always maintained in the National Park such as mantangan (Merremia peltata (L.) Merr.) Chromolaena odorata (L), Stachtarpheta jamaicensis. Based on the way of life and rapid reproduction of this invasive plant, it disturbs the habitus of other plants in developing so that it can damage the food chain in the National Park. Conservation of animals in National Park must be in line with the conservation of the surrounding ecology so that the natural ecosystems in the National Parks and biodiversity are fully preserved.
Inhibition Test of Hot Water Extract of Rhizophora apiculata Leaves Against Edwardsiella tarda Bacteria in-Vitro Ronal Kurniawan; Sri Wahyuni; Fitrian Armando
Jurnal Natur Indonesia Vol. 20 No. 1 (2022): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.20.1.30-34

Abstract

One of the plants that have the potential as antibacterial ingredients is Rhizophora apiculata leaf because it contains secondary metabolites, such as tannins, saponins, flavonoids, steroids, and terpenoids. This study aims to find out the inhibition of hot water extract of R. apiculata leaves in inhibiting the growth of Edwardsiella tarda. The research method used is an experimental method which includes sample preparation, extraction, antibacterial activity test using the Kirby-Bauer disc method and applying a Completely Randomized Design (CRD). The doses used were 100% (10000 ppm), 90% (9000 ppm), 80% (8000 ppm), 70% (7000 ppm), 60% (6000 ppm), 50% (5000 ppm), 40% (4000 ppm), 30% (3000 ppm), 20% (2000 ppm), 10% (1000 ppm) and control (Oxytetracycline). The results showed that the hot water extract of R. apiculata leaves at a dose of 1000-10000 ppm gave various inhibitory diameters ranging from 6.25-10.08 mm and the clear zone formed was classified as medium
Identification of Vibrio sp. Bacteria in Intensive and Traditional Ponds of Vannamei Shrimp (Litopenaeus vannamei) in Teluk Pambang Village, Bengkalis Regency Gustina, Lenny; Feliatra, Feliatra; Nursyirwani, Nursyirwani; Widantari, Meilya
Jurnal Natur Indonesia Vol. 23 No. 1 (2025): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.1.34-41

Abstract

The identification of Vibrio sp. bacteria in the water of intensive and traditional ponds for vannamei shrimp in Teluk Pambang Village was conducted from March to June 2023. The aim of this research was to calculate the quantity of Vibrio sp. bacteria, understand the morphological characteristics, and identify the various types of Vibrio sp. bacteria in the water of intensive and traditional ponds for vannamei shrimp. The sampling involved collecting water from 2 bottles each from intensive and traditional ponds. Subsequently, Vibrio isolation from the water was cultured on selective TCBS media through three dilution steps. The bacterial count was then determined. Further, bacterial cultures from different colonies were streaked on TSA media, followed by identification through a series of morphological observations and biochemical tests. The research results indicate that the presence of Vibrio bacteria in intensive ponds complies with the maximum threshold and quality standards for a favorable environment for both the pond and shrimp. However, for traditional ponds, there is an abundance of Vibrio bacteria exceeding the threshold, where the maximum limit or good quality standard for Vibrio in the environment and shrimp is 103 CFU/ml. The morphological characteristics found include a round shape, green and yellow color, and a flat edge with emerging elevations. Furthermore, infections of Vibrio hollisae, Vibrio anguillarum, and Vibrio damsela were identified in the water of intensive and traditional ponds for vannamei shrimp (Litopenaeus vannamei) in Teluk Pambang Village, Bengkalis Regency.
Types and Abundance of Beach Waste in the Coastal Area of Kampung Beran Tanjung Harapan, Meranti Islands District Exaudi, Bonita Tiolina; Amin, Bintal; Nedi, Syahril
Jurnal Natur Indonesia Vol. 23 No. 1 (2025): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.1.29-33

Abstract

This research was carried out in June 2023; the research location was on the coast of Kampung Beran, Tanjung Harapan, Meranti Islands Regency. This research aims to determine the type and abundance of beach litter, analyze the differences in the type and abundance of beach waste between stations, and analyze the type and abundance of beach litter between sampling times. Beach litter data collection was taken at three stations, with each station 25m in distance. Each station has three transect lines with nine plots or quadrants measuring 5×5 m2 with a distance between plots of 5m. Sampling was conducted during low tide and on weekdays (Tuesday, Wednesday) and weekends (Saturday, Sunday). Based on the research results, five types of beach litter were found, namely plastic (40%), iron/metal materials (5%), broken glass/ceramic (31%), rubber (3%), wood (11%), and others (10%). The highest abundance of waste occurred on weekdays (10,59 units/m2), and the lowest waste occurred on weekends (7,97 units/m2). ANOVA analysis and independent sample test show that the abundance of beach litter waste between stations and between sampling times did not have significant differences (P > 0.05).
Effect of Chitosan Extracted from Vannamei Shrimp (Litopenaeus vannamei) Shells in Feed on the Growth Performance and Digestibility of Nile Tilapia (Oreochromis niloticus) Rangkuti, Putra; Suharman, Indra; Siagian, Desi Rahmadani
Jurnal Natur Indonesia Vol. 23 No. 1 (2025): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.1.1-9

Abstract

Chitosan extracted from vannamei shrimp shells has the potential to act as an attractant for Nile tilapia (Oreochromis niloticus) while also enhancing growth performance and digestibility in various fish species. This study evaluated the impact of chitosan supplementation in feed on Tilapia's growth rate and digestibility. The experiment was designed using a Completely Randomized Design (CRD) with five treatment groups and three replications. Fish were fed diets containing chitosan at 0%, 1%, 2%, 3%, and 4% for 56 days. 525 tilapia fingerlings (2.50±0.41 g) were stocked in 15 floating net cages (1x1x1 m3). Feed was provided at 10% of the fish biomass three times daily at 08:00 AM, 01:00 PM, and 05:00 PM. The results indicated that chitosan supplementation significantly (P<0.05) influenced Tilapia's specific growth rate and digestibility. Among the tested levels, the 4% chitosan treatment yielded the highest values, including overall digestibility (52.38%), protein digestibility (74.72%), protein retention (27.27%), feed efficiency (34.77%), specific growth rate (3.33%), and 100% survival rate. These findings suggest that incorporating chitosan into tilapia feed can enhance growth performance and nutrient utilization.
Utilization and Contribution of Non-Timber Forest Products to the Community Economy in Sentajo Protected Forest Suhada, Nur; Somadona, Sonia; Dilas, Akbar Alldhu
Jurnal Natur Indonesia Vol. 23 No. 1 (2025): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.1.16-21

Abstract

The potential of Non-Timber Forest Products (NTFPs), in general has not been optimally utilized. The processing of NTFPs for the people of Koto Sentajo Village is still not the primary source of income for the community but is part of fulfilling daily living needs. This study aims to determine the types of NTFP utilization and their contribution to the economy of the community in Koto Sentajo Village. This study uses a qualitative descriptive approach, and primary data were collected through observation and in-depth interviews using purposive sampling techniques. Data were analyzed quantitatively. The results of this study found that the types of NTFPs utilized by the people of Koto Sentajo Village are fruits and medicinal plants; the types of fruits are keranji (Dialium indum), tampui (Baccaurea macrocarpa), geruntang (Phoebe grandis), cempedak (Artocarpus fretessii), forest durian (Durio zibethinus), kulim (Scrodocarpus borneensis), petai (Parkia speciosa), and barangan (Castanopsis argentea). In contrast, the types of medicinal plants most widely utilized are sepico (Eurycoma longifolia Jack) and rosam (Dicranopteris linearis). The contribution of NTFPs to the people's economy in Koto Sentajo Village is 5.6% of the total income of the community, or around IDR 1,519,851/person/year, to the average total income of IDR 26,983,265/person/year
Distribution and Clinical Significance of Nuclear Factor Erythroid 2-Related Factor 2 Gene Polymorphism in Chronic Hepatitis B: A Cross-Sectional Study Yuhendri, Vitriyanna Mutiara; Labecka, Magda; Ibrahim, Sundus; Arfianti, Arfianti
Jurnal Natur Indonesia Vol. 23 No. 1 (2025): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.1.10-15

Abstract

Chronic hepatitis B (CHB) infection is associated with serious complications, including liver cirrhosis and hepatocellular carcinoma (HCC). Nuclear factor erythroid 2-related factor 2 (NRF2) is a transcription factor that regulates the expression of antioxidant genes, helping protect cells and tissues from oxidative stress, a process involved in the pathogenesis of chronic hepatitis B (CHB). This study aimed to determine the distribution of NRF2 polymorphisms in CHB patients and their association with complications. The study included 68 CHB patients, with 33 having no complications and 35 with complications (Cirrhosis and HCC). Genotyping of the NRF2 polymorphisms, rs35652124 (A→G) and rs6721961 (C→A), was performed using confronting two-pair primers and polymerase chain reaction (PCR-CTPP). The serum levels of bilirubin, albumin, and alanine aminotransferase (ALT) were measured using commercial kits. The mean age of subjects was 45.34±1.32 years old on average. There was no significant difference in mean bilirubin and ALT levels between patients with and without CHB complications. However, patients without complications had significantly higher albumin levels than those with complications (4.0±0.8 vs. 3.37±0.7 g/dL; p<0.05). The most common genotypes for NRF2 rs35652124 were AG (51.85%), AA (40.74%), and GG (7.41%), while for NRF2 rs6721961, the were CA (51.47%), CC (45.59%), and AA (2.94%). The distribution of NRF2 genotypes did not differ significantly between CHB patients with and without complications (p>0.05). This study suggests that NRF2 gene polymorphisms may not contribute to the development of Cirrhosis and HCC in CHB. Further research with a larger sample size is needed to confirm these findings.
Carbon Stock in Sediments of Mangrove Ecosystems in Pangkalan Jambi Village, Bengkalis Regency Furqan, M. Alief; Amin, Bintal; Nursyirwani, Nursyirwani
Jurnal Natur Indonesia Vol. 23 No. 1 (2025): April
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.23.1.22-28

Abstract

The study on carbon reserves in sediment within Pangkalan Jambi Village, Bengkalis Regency's mangrove ecosystem, was conducted from June to 2024. This research aimed to analyze carbon reserves in the sediment of the mangrove ecosystem in Pangkalan Jambi Village, Bengkalis Regency, Riau Province. The study employed field survey methods and laboratory analyses, focusing on three stations with varying mangrove densities. Results revealed nine mangrove species, dominated by Rhizophora mucronata. The average mangrove density was 2,611 individuals/ha, with a carbon reserve of 43.25 tons/ha across all stations. The study found a positive correlation (r = 0.528) between mangrove density and carbon reserves, explaining 27.98% of the total variation. Furthermore, carbon reserves showed no significant differences across sediment depths. These findings emphasize the importance of mangrove conservation for carbon storage, contributing to climate change mitigation. Further biomass and species-specific carbon storage research is recommended to optimize mangrove management strategies.

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