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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Jurnal Natural
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  This is an Open Access Journal Open Access journal
ISSN (Print) 1411-8513 - ISSN (Online) 2541-4062
Published by Universitas Syiah Kuala Homepage  [19 journals]
  • The removal of remazol brilliant blue dyes from liquid waste using nano
           montmorillonite from bentonite of Bener Meriah Aceh

      Pages: 68 - 72
      Abstract: Research on the potential of nano montmorillonite as an adsorbent for Remazol Brilliant Blue dye waste has been carried out. Nano montmorillonite was isolated from Bener Meriah bentonite, Aceh, to be used as an adsorbent. The optimum conditions for adsorption of Remazol Brilliant Blue dye using nano montmorillonite occurred at a contact time of 60 minutes, pH 4, and adsorbent mass of 2 grams. The results showed that the adsorption of Remazol Brilliant Blue dye by nano montmorillonite followed the Freundlich isotherm model with R2 = 0.9858. The results of the regeneration test show that the montmorillonite nano adsorbent can be used repeatedly
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.24394
      Issue No: Vol. 22, No. 2 (2022)
  • Differential tolerance of Trichoderma harzianum and Rhizoctonia solani
           towards silver nanoparticles: potential for agricultural applications'

      Pages: 73 - 77
      Abstract: In the previous study, we examined the effect of silver nanoparticles (AgNPs) on beneficial soil fungus including Trichoderma harzianum (T22), and pathogenic soil-borne fungus, Rhizoctonia solani (AG3-PT). The result exhibited that T. harzianum (T22) is tolerance towards AgNPs. On the other hand, the pathogenic fungi, R.solani (AG3-PT), is more sensitive to AgNPs. T. harzianum is well known as biocontrol agent to suppress R. solani. Therefore, in this study we investigated the combination of T. harzianum (T22) and AgNPs at low concentration to control two strains of R. solani (AG3-PT and AG2-1). The effect of AgNPs at two different levels (20 mg L-1 and 50 mg L-1) was examined over the growth of the two strains of R. solani and T. harzianum (T22) using dual culture technique. The results shows that this combination have a potential to reduce colony growth of R. solani (AG2-1) at higher AgNPs concentration. However, it was not the case for R. solani (AG3-PT). It can be concluded that AgNPs toxicity depend on several factors including species strain and the size of AgNPs particle.
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.24149
      Issue No: Vol. 22, No. 2 (2022)
  • Coconut oil effect on the hygroscopic properties of Simalambuo wood
           (Lophopetalum spp.)

      Pages: 78 - 84
      Abstract: Simalambuo (Lophopetalum spp) trees are endemic to Southeast Asia and widely grow in the natural forests in Nias island. Local people whose experience of utilizing the simalambuo wood have claimed that the wood easily absorbs water. Throughout our searches, not many efforts to modify the physical properties of the simalambuo woods have been carried out yet. Therefore, in this study, we modified simalambuo wood by thermal treatment in coconut oil-ambient conditions. The heat treatment became an option to support the efforts in reducing the use of non-environmental-friendly materials and methods. The simalambuo wood was treated under coconut oil at 130-210oC for 6 hours. Coconut oil uptake was up to 174%, while the leaching test (AWPA E-06 standard) showed the uneasily permeate out from the wood and high retention differently in terms of treatment and cooling temperature. Heat treatment with coconut oil affected water absorption ability and improved dimensional stability of simalambuo wood. Water absorption reduced from 162% to 16%, and dimensional stability increased from 8.4% to 4.2% at 192 hours after being soaked in water. The higher the difference between treatment and cooling temperature, the better-affected water absorption ability was and the higher dimensional ability could be achieved.
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.24158
      Issue No: Vol. 22, No. 2 (2022)
  • The effect of plant growth promoting Rhizobacteria treatment on
           germination and seedlings growth of chilli

      Pages: 85 - 93
      Abstract: The aim of the research was to study the effects of biological seed treatment utilization rhizobacteria on seed germination and seedling growth, furthermore to figure out the competence of rhizobacteria isolates to dissolve phosphate, produce acetic indol acid (IAA) and siderophore. 18 rhizobacteria isolates used in this research, each isolates was anlayze in vitro; IAA, phosphate and siderophore. Then carried out the in vitro test, the pepper seeds were inoculated with rhizobacteria isolates suspension then germinated. Seedlings were transpalated into a plastic pot filled with medium soil and compost (2:1). The germination was observed everyday until 14 days, the seedlings was observed at 4 and 6 weeks after transplating. Based on the study, all the rhizobacteria isolates produced IAA, 13 rhizobacteria isolates capable to dissolve phosphate and 12 rhizobacteria isolates produced siderophore. Seed treatment using RBNA 14, RBNA 13, RBKB 5, and RBSPA 14 adequate to increase the germination in seed viability and vigor also increase seedling growth
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.24458
      Issue No: Vol. 22, No. 2 (2022)
  • Waterlogging and restricted-below ground aeration on photosynthetic
           performance and root elongation rate of RRIM 600 and RRIT 251 rubber
           genotypes (Hevea brasiliensis Mull. Arg.)

      Pages: 94 - 101
      Abstract: Due to extended inundation, waterlogging and restricted below-ground aeration cause inhibition in plant growth performance. This study examined two different rubber clones, RRIM 600 and RRIT 251, for waterlogging and restricted below ground aeration. To evaluate the plant performance under the stress conditions, net photosynthetic rate (PN), maximum quantum yield photosystem II (Fv/Fm) and root elongation rate were observed. RRIM 600 has a higher photosynthetic performance under normal conditions. However, the PN rate and Fv/Fm ratio trend showed that RRIM 600 seems to have difficulties recovering after exposure to restricted-below ground aeration. Although RRIT 251 had a lower tendency of PN rate under normal conditions, the PN rate and Fv/Fm ratio of this clone showed fast recovery. RRIT 251 also performed a higher trend of root elongation rate under both stress conditions than RRIM 600.
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.25522
      Issue No: Vol. 22, No. 2 (2022)
  • Utilization of shallot extract and administration of indole acetic acid to
           Chrysanthemum sp in vitro culture

      Pages: 102 - 107
      Abstract: Chrysanthemum sp is a plant that has the potential to be developed in Indonesia, apart from being an ornamental flower, it can also be used as a herbal medicine. One of the efforts to develop chrysanthemum can be done in vitro by using organic growth regulators such as shallot extract and indole acetic acid (IAA). The research aims to identify the effect of shallot extract and IAA on the growth of Chrysanthemum sp. The research was conducted at UPT Central Horticulture Seed Center, Medan Johor, in December 2019 - January 2020. The research used a factorial Completely Randomized Design (CRD) with 2 factors, namely the first factor was shallot extract which consisted of 4 levels, namely 0, 35, 70, and 105 g/L water. The second factor was IAA which consisted of 4 levels, namely 0.6, 0.9, 1.2, and 1.5 mg/L water. The results showed that the administration of shallot extract had no significant effect on the growth of chrysanthemum, but the administration of IAA had a significant effect on the number of leaves and plant height with the best concentration at 0.6 mg/L water. The interaction of the two treatments also had no significant effect on the growth of chrysanthemum.
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.25778
      Issue No: Vol. 22, No. 2 (2022)
  • Implementation of Winsorizing and random oversampling on data containing

      Pages: 108 - 116
      Abstract: Many researchers conduct research using the classification method, to find out the best method for predicting the class of an observation. Some of these studies explain that random forest is the best method. However, the classification of data containing outliers and unbalanced data is a complicated problem. Many researchers are also conducting research to deal with these problems. In this study, we propose a winsorizing to deal with outliers by replacing the outlier values with the upper and lower limit values obtained from the interquartile range method and random oversampling to balance the data. It is also known that cases of the Human Development Index (HDI) in regencies/cities in eastern Indonesia vary widely, so cases of HDI in these areas can be used as case studies of data containing outliers and unbalanced data. The purpose of this study was to compare the performance of the random forest before and after the data were applied to the winsorizing and random oversampling to predict HDI in districts/cities in eastern Indonesia. Classification method random forest after handling data containing outliers and unbalanced data has better performance in terms of accuracy and kappa values, which are 96.43% and 93.41%, respectively. The variables of expenditure per capita and the mean years of schooling are the most important.
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.25499
      Issue No: Vol. 22, No. 2 (2022)
  • Types of plants that are used for postpartum care and conservation efforts
           in Singkil Subdistrict

      Pages: 117 - 123
      Abstract: Inventory of postpartum care plants is a collection of types of plants used by the community in healing postpartum care. This study aims to find out the types, parts, and ways of processing plants used in postpartum care as well as conservation efforts made to plants that have the potential as postpartum care in Singkil District, Aceh Singkil Regency. The research was conducted in July until August 2020, and data collected using a qualitative descriptive method with structural observations and interviews. The data source taken was 50 respondents consisting of 10 physicians, 10 midwives, and 30 mothers who had given birth. Data analysis is done descriptively using a qualitative approach. The results of the study obtained 31 species of plants used for postpartum care, parts of plants used to consist of fruit, seeds, stems, flowers, leaves, tubers, and rhizomes, the processing was carried out by boiling and grinding.
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.22869
      Issue No: Vol. 22, No. 2 (2022)
  • Acute toxicity evaluation of ethanolic extract of the leaves of Anredera
           cordifolia in wistar rats (Rattus Norvegicus)

      Pages: 124 - 129
      Abstract: Anredera cordifolia (Binahong) is one of the medicinal plants that has been widely used for its properties of inhibiting the growth of microorganisms, decreasing blood uric acid, and healing wounds. This study was conducted to evaluate the acute toxicity effects of ethanolic extract of binahong to support its use as a medicinal plant. Ethanolic extracts of binahong leaves were prepared. Twenty-five white male rats (Rattus norvegicus) were divided into 5 groups and administered with a single dose of Na-CMC suspension or a dose of 300, 600, 1200, or 2400 mg/kg BW of binahong ethanolic leaf extract, respectively. Toxicity symptoms were monitored at three-time intervals: ½-1, 1½-2, and 3-6 hours after the administration. A macroscopic evaluation of the rat’s liver was carried out to identify any lesion. The rat’s liver and whole-body weights were determined to assess the weight reduction. The results showed that there was no dead rat in any of the groups, indicating that no LD50 was identified. Also, there were several toxic effects observed including a decrease in movements, somatic response, insensitivity, and stool consistency. There was no evidence of a lesion on liver macroscopy. However, the weights of rats’ livers increased in tandem with the reduction in their body weights. The findings from this study reveal that single dose of binahong ethanolic extract ranging from 300 to 2400 mg/kg BW are safe, while minimal toxic effects were observed.
      PubDate: 2022-06-30
      DOI: 10.24815/jn.v22i2.22285
      Issue No: Vol. 22, No. 2 (2022)
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