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Dinia R Dwijayanti,
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Biotropika
Published by Universitas Brawijaya
ISSN : 23027282     EISSN : 25498703     DOI : 10.21776/ub.biotropika.
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology
Biotropika: Journal of Tropical Biology invites research articles, short communication, and reviews describing new findings/phenomena of biological sciences in tropical regions, specifically in the following subjects, but not limited to biotechnology, biodiversity, microbiology, botany, zoology, biosystematics, ecology, and environmental sciences.
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Articles 7 Documents
 1 
Search results for , issue "Vol. 12 No. 2 (2024)" : 7 Documents clear
Isolation and Identification of Mercury-Resistant Fungi as Bioremediation Agents from Gold Mining Sahana, Laudy Arrisa Arumsari; Mohamad , Yani; Rohani Cinta Badia Br , Ginting
Biotropika: Journal of Tropical Biology Vol. 12 No. 2 (2024)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2024.012.02.01

Abstract

To overcome the pollution problem due to the accumulation of heavy metal Hg, a clean-up or remediation effort is needed from the former landfill for hazardous and toxic waste.  In this research, bioremediation experiments will be conducted by inoculating fungi culture that is already known to have the potential to absorb heavy metals Hg. Samples of soil contaminated with heavy metals Hg taken from the tailings of gold mining owned by the people in Kertajaya Village, Simpenan District, Sukabumi Regency. The stages of this study consisted of isolation of fungi, purification and morphology of fungi isolate, screening of fungi isolate, qualitative screening of fungi for ligninolytic activity (laccase), and molecular identification of the isolated fungi. The results of the screening showed that three isolates of potential fungi coded M.2, M.10, and M.13 were able to grow with a mercury concentration of 350 ppm, while one isolate coded R4.28 reached a concentration of 1000 ppm. In addition, isolate M.2 was selected as the best strain compared to isolates M.10, M.13, and R4.28 for the qualitative test of laccase production in ligninolytic enzymes. Based on the molecular analysis of the 18S rRNA gene, M.2 isolates were similar to Trichoderma yunnanense, which was strengthened by a similarity value of 99.66%. Isolate R4.28 was similar to Penicillium soli, which was strengthened by a similarity value of 99.32%.
Effect of Aeration Period and Co-Culture with Bacteria on Growth and Lipid Profile of Chlorella vulgaris Khaq, Rizki Amalia Nurul; Rohman, Fatchur; Lukiati, Betty; Prabaningtyas, Sitoresmi
Biotropika: Journal of Tropical Biology Vol. 12 No. 2 (2024)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2024.012.02.02

Abstract

Giving bacteria to microalgae culture can increase the growth of microalgae. Giving aeration can increase oxygen levels in the culture. Good culture conditions can optimize microalgae growth, so the biomass obtained is also higher. The amount of microalgae biomass is directly proportional to the amount of lipids produced. This study aims to determine the effect of the aeration period and the addition of potential bacteria on the growth and lipid profile of Chlorella vulgaris. The aeration periods were 6, 12, 18, and 24 hours. The bacteria used in the co-culture treatment of this study were indole acetic acid (IAA) producing bacteria, amylolytic bacteria, and nitrogen-fixing bacteria from the exploration and identification of several lakes in East Java. Microalgae C. vulgaris co-cultured with IAA, amylolytic and nitrogen-fixing bacteria were given aeration for 6 hours, 12 hours, 18 hours and 24 hours (in different treatment bottles). Microalgae treatment without giving bacteria is done only by giving aeration for 6 hours, 12 hours, 18 hours, and 24 hours (in different treatment bottles). The results showed that there was effect of the aeration period, the culture type, and the interaction between the aeration period and the addition of bacteria on the growth and lipid profile of C. vulgaris. The highest average cell density of C. vulgaris on day 16 was TBA18 mono-culture treatment with an aeration period of 18 hours (26.95 x 106 cells/mL), and BTA co-culture treatment without aeration (12.75 x 106 cells/mL). The harvested biomass of C. vulgaris was used for lipid profile assays. The results of the GC-MS test of TBA18 and BTA treatment showed that the two samples had the same six main compounds but different concentrations. The six compounds are oleic acid, palmitoleic acid, ?-linolenic acid, linoleic acid, stearidonic acid and myristic acid.
Computational Insight on Bioactive Compound Potential Activity of Kenitu (Chrysophyllum cainito L.) Leaves as PPAR-y Antagonist for Obesity Rosyada, Nabila Nur; Andyni, Regina Shania; Alvionita, Cicin Vinolia; Narwasthu, Sekararum; Adawiyah, Robiatul; Hermanto, Feri Eko; Kurniawan, Nia; Fatchiyah, Fatchiyah
Biotropika: Journal of Tropical Biology Vol. 12 No. 2 (2024)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2024.012.02.03

Abstract

Studies reported that kenitu (Chrysophyllum cainito) has the potential as an anti-obesity agent. However, the mechanism underlying that activity remains unknown. On the other hand, targeting PPAR-y has played a beneficial role in regulating obesity. Therefore, this study will explain the anti-obesity potential of natural compounds from C. cainito in modulating obesity through inhibition of PPAR-y. Molecular docking was employed to identify the possibility of several compounds binding with the PPAR-y. Moreover, the stability of the interaction between PPAR-y and each compound was also evaluated using molecular dynamics analysis. The result showed that beta-sitosterol, lupeol, myricitrin, quercitrin, rutin, vitamin A, epicatechin, and chlorogenic acid are worthy of potential as PPAR-y antagonists. In advance, molecular dynamics simulations revealed that chlorogenic acid, quercitrin, and epicatechin were the most stable compounds to interact as an inhibitor of PPAR-y. In conclusion, compounds from star apple have some potential to improve the health status of patients’ obesity through PPAR-y antagonist activity.
Abundance and Phylogenetic Analysis of High-Density Polyethylene (HDPE) Biodegrading Bacteria from Brantas River, Malang City Wiratno, Ekwan Nofa; Sandra Wardani, Erika; Agustin, Nurmalita
Biotropika: Journal of Tropical Biology Vol. 12 No. 2 (2024)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2024.012.02.06

Abstract

Microplastic pollution has become a global concern after the COVID-19 pandemic. This requires efforts to resolve the various adverse effects of microplastic pollution in the aquatic environment. This study aimed to isolate, enumerate, and determine the potency of microplastic biodegrading bacteria from the Brantas River, Malang City. This research includes environmental factor measures, bacterial isolation, enumeration, biodegradation would be produced (qualitative and quantitative), DNA isolation, PCR, sequencing, phylogenetic analysis, and data analysis. The environmental conditions of the sampling locations are generally homogeneous. The river temperature observed ranged from 24.1 to 27.2 °C. Research locations that have acidity ranging from 7.35 to 8.16. The salinity of the Brantas River ranges from 205-306 ppm or 0.0205-0.306%. The conductivity of the Brantas River ranges from 410-612 µS/cm. Isolation produced six different bacterial isolates. The amount of each isolate varies in each sample. A qualitative microplastic biodegradation test was indicated by the growth of colonies in the plastic area. This result shows that the bacterial isolate uses plastic as a carbon source. All isolates grow around plastic. Quantitative tests using HDPE sheets show that not all isolates can biodegrade microplastics. Bacterial isolates capable of biodegrading were isolates K2 (5.41%), K22 (5.16%), and K5 (6.69%). Based on phylogenetic analysis, it is known that isolate K2 has a similarity of 36.4% to ON845428.1 Klebsiella sp. strain 214 37 z 3, and ON845427.1 Klebsiella sp. strain 213 37 z 1. Isolate K2 has a distance score of 1.268 to MZ642649.1 Klebsiella variicola strain PDW768. Isolate K22 has a similarity of 36.8% with KT895299.1 Enterobacter cloacae strain Jilu WG154. The distance score of isolate K22 showed values of 1.179 and 1.156 against MH796357.1 Enterobacter sp. strain 3C, and OQ813771.1 Enterobacter cloacae strain TBMAX59. Similarity and distance score values consistently showed that isolates K2 and K22 were not identified at the genus level. These two isolates have the potential to be recognized as new species.
Ethnobotany of Adenium obesum (Forssk.) Roem. &Schult. : A Review Setiyanto, Afif Eka Rahma; Zulfatim, Heni Sukma; Septi Tri Puspita Sari; Krisnawati, Dewi
Biotropika: Journal of Tropical Biology Vol. 12 No. 2 (2024)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2024.012.02.04

Abstract

Adenium obesum (Forssk.) Roem. & Schult., commonly known as the ‘desert rose,’ is a member of the Apocynaceae family, cultivated extensively in various tropical regions. While Adenium obesum is primarily used as an ornamental plant, previous research has documented its biological activities and phytochemical constituents. However, there has been no comprehensive review of its ethnobotanical applications. This study aims to summarize and discuss the ethnobotanical uses of Adenium obesum through a literature review. The ethnobotanical information of Adenium obesum can be categorized into five primary groups: ornamental plant, eco-print source, religious ceremonies, medicinal uses, and toxic effects. The plant is renowned for its aesthetic appeal, particularly its flowers and roots, often shaped into bonsai. This characteristic underscores its potential in the floriculture industry and agrotourism. In eco-printing, Adenium obesum creates patterns on fabrics through direct contact. In religious contexts, the plant is used in offerings and pilgrimage ceremonies at cemeteries. Adenium obesum has been approved for treating various diseases in humans and chickens. Conversely, it also possesses toxic properties that are harnessed for hunting purposes. Different regions and cultures employ Adenium obesum in diverse ethnobotanical applications. The findings conclude that Adenium obesum has significant ethnobotanical utility, presenting several prospects, such as its incorporation into the ornamental plant industry, agrotourism, and the development of other art objects or plant parts beyond its flowers. Furthermore, scientific validation is necessary to maximize the beneficial effects and manage the toxic properties of this plant to ensure its proper utilization.
The Use of Purple Eggplant Fruit Calyx Stem (Solanum melongena L.) as an Alternative Source of Lactase-Producing Lactic Acid Bacteria Mike Permata Sari; Radhina, Afifa; Indriani, Narita
Biotropika: Journal of Tropical Biology Vol. 12 No. 2 (2024)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2024.012.02.05

Abstract

Lactose intolerance is a condition where the body cannot digest lactose due to a deficiency of the lactase enzyme in the digestive system, leading to various health issues and indirectly increasing the risk of stunting. To prevent lactose intolerance, supplements containing the lactase enzyme or foods and drinks low in lactose, such as yoghurt, are recommended. Yoghurt production requires microorganisms capable of synthesizing the lactase enzyme, such as lactic acid bacteria (LAB). This research is an experimental study exploring the potential of purple eggplant stalks and petals (Solanum melongena L.) as a new source of LAB capable of synthesizing the lactase enzyme. The experiment began with making yoghurt from milk with added purple eggplant calyx stems as initial proof of LAB presence. Milk was chosen as the initial growth medium because it contains lactose, which acts as a substrate for the lactase enzyme found in LAB. The obtained yoghurt was then inoculated into selective media, resulting in the growth of gram-positive bacilli colonies. The lactase enzyme was isolated from LAB using the sonication method. Optimum enzyme activity was achieved at 70°C and pH 7, measuring 0.0061 U/Mg. This research concludes that purple eggplant stalks and petals contain LAB capable of synthesizing the lactase enzyme. Hopefully, this research will progress to purifying the lactase enzyme and developing lactase enzyme supplements, which can be tested as a therapy for lactose intolerance.
Corrigendum to “Pemanfaatan Tumbuhan Lokal secara Tradisional dalam Peningkatan Ketahanan Pangan oleh Suku Dayak Iban di Desa Mensiau, Kalimantan Barat" Arini, Wahyuningyan; R Saputra, Venza; Ramadani, Harri
Biotropika: Journal of Tropical Biology Vol. 12 No. 2 (2024)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2024.012.02.07

Abstract

Corrigendum to “PEMANFAATAN TUMBUHAN LOKAL SECARA TRADISIONAL DALAM PENINGKATAN KETAHANAN PANGAN OLEH SUKU DAYAK IBAN DI DESA MENSIAU, KALIMANTAN BARAT” [Biotropika: Journal of Tropical Biology, (9)1, 38-45]

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