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INDONESIA
Journal of Natural Sciences
Published by Mahesa Research Center
ISSN : -     EISSN : 27215571     DOI : 10.34007
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
The Journal of Natural Sciences is a scientific publication media in the study and development of Science in the fields of science and Education (Biology, Chemistry, and Physics). The Journal of Natural Sciences includes scientific writings in the form of conceptual, research results as well as relevant issues in the fields of science and education. The Journal of Natural Sciences is published three times a year.
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Ilmu Lingkungan (Lain-Lain)
Articles 117 Documents
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Potensi Buah Andaliman (Zanthoxylum acanthopodium DC.) sebagai Antibakteri Terhadap Salmonella typhi Helen Anjelina Simanjuntak; Hermawan Purba; Cander Pasaribu; Junius Gian Ginting; Rahmiati Rahmiati; Toberni S Situmorang
Journal of Natural Sciences Vol 4, No 2 (2023): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v4i2.404

Abstract

Typhoid fever is a major disease of death in the medical field caused by Salmonella typhi infection with symptoms including fever, mucosal lesions, vomiting, diarrhea, fluid loss, septicemia, and peritonitis. The use of natural plants to cure infectious diseases such as andaliman fruit. The aim of this study was to determine the antibacterial activity of Andaliman fruit extract on the growth of Salmonella typhi. Experimental research method. The Kirby-bauer method was used for the antibacterial test, the maceration method was used for extraction. The results of phytochemical compounds found flavonoids, tanins, saponins, tannins, alkaloids steroids, and triterpenoids in simplicia and andaliman fruit extracts. All extracts have the potential to inhibit the growth of Salmonella typhi, with the diameter of the inhibition zone consisting of 10.04 mm, 12.22 mm, 15.46 mm and 16.68 mm in the strong category. These doses are 10%, 30%, 50%, and 70%. The analysis shows the potential of Andaliman fruit extract as an antibiotic in the treatment of typhoid fever.
Model Inkuiri Terhadap Keterampilan Berpikir Kritis Ditinjau Dari Gaya Belajar Siswa Pada Pembelajaran Biologi Lian Meliana; Ina Setiawati; Handayani Handayani
Journal of Natural Sciences Vol 4, No 2 (2023): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v4i2.387

Abstract

Students are required to have competencies in accordance with the needs of the 21st century, one of which is critical thinking skills. However, within the scope of education in Indonesia, critical thinking skills have not been able to be developed due to the low diversity of the learning process and the teacher's ignorance of each student's learning style. The inquiry model is applied to facilitate students development of critical thinking skills. This study aims to analyze: 1) the effect of the inquiry learning model on students' critical thinking skills; 2) the influence of learning styles on students' critical thinking skills; and 3) the interaction between inquiry learning models and learning styles on students' critical thinking skills. This is quasi-experimental research. The research method used was quasi-experimental with Nonequivalent Pretest and post-test Control-Group Design. The data were analyzed using a two-way ANOVA test with a significance level of 5%. Based on the research results, the following results were obtained: 1) The inquiry learning model influences critical thinking skills; 2) Students' learning styles do not affect critical thinking skills; and 3) There is no interaction between the inquiry learning model and students' learning styles on critical thinking skills.
Analisis Cemaran Eschericia coli pada Minuman Cendol yang Dijual di Komplek MMTC dan Sekitarnya Toberni S Situmorang; Rahmiati Rahmiati; Helen Anjelina Simanjuntak
Journal of Natural Sciences Vol 4, No 2 (2023): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v4i2.406

Abstract

Eschericia coli bacteria are fecal coliform bacteria that belong to the Enterobacteriaceae group. This bacterium is an indicator of water quality to test for fecal contamination in a water sample. Cendol is a drink that has many fans because of its sweet and savory taste. The high consumption of cendol in the community is the basis for this drink to maintain its quality. One of the qualities that must be considered is the microbiological quality. The research was carried out in a quantitative descriptive manner and the research data will be displayed in the form of data tabulations. There were 3 samples of cendol tested namely TS1, TS2 and TS3. There were 3 stages in conducting the research, namely sample preparation, counting of total bacteria and testing of Eschericia coli bacteria on selective eosin methylene blue agar (EMBA) media. The results of the analysis showed that the total number of bacteria in the cendol samples tested on samples TS1, TS2 and TS3 were 1.2 x 104 colonies respectively; 4.8 x 104 colonies and 6.6 x 104 colonies. The results of the analysis of E. coli bacteria in the three samples showed that the three samples showed the growth of E. coli bacteria in the test medium. Colonies of E. coli bacteria on EMBA media are marked by the growth of metallic green colonies
Pengaruh Variasi Formulasi Campuran Daun Kelor dan Serai Dapur Terhadap Mutu Kombucha (Mocy) Tedi Tedi; Zaenal Abidin; Edi Junaedi
Journal of Natural Sciences Vol 4, No 2 (2023): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v4i2.395

Abstract

The abundant moringa and lemongrass plants can be used to make Kombucha products. By utilizing Moringa leaves and lemongrass which are fermented by Symbiotic Culture of Bacteria and Yeast (SCOBY) to become Kombucha. This study aims to determine the effect of variations in the formulation of a mixture of Moringa leaves and lemongrass on the chemical characteristic quality of Total Titrated Acid (TAT), presence of flavonoids, and organoleptic quality. This research is a quantitative research. The results of the study were the TAT value of formulation 1 (0.454%), formulation 2 (0.432%), formulation 3 (0.445%), and control (0.54%). The results of the analysis showed that variations in the formulation of a mixture of moringa leaves and lemon grass had no significant effect on the TAT value of Kombucha with F Count (0.93) F Table 5% (3.10). Flavonoids in Kombucha were tested qualitatively by 3 reagents seen from the color change. At 10% NaOH it showed a yellow brown color, 1% AlCl3 reagent was yellow, and H2SO4 reagent was pale yellow to yellow brown, and all samples showed positive results for the presence of flavonoids. Organoleptic assessment with color results X²r count (6.03) X²r table 1% (6.250), aroma X²r count (11.47) X²r table 5% (7.810), taste X²r count (18.91) X²r table 5 % (7,810). So that the variation in formulation has a significant effect on aroma and taste, but not on the color of Kombucha moringa leaves and lemon grass.
Hubungan Kekerabatan Kakatua (Psittaciformes) Berdasarkan Gen Cytochrome C Oxidase Subunit I (COI) secara In-silico Pharmawati, Made; Rosiana, I Wayan
Journal of Natural Sciences Vol 5, No 2 (2024): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i2.467

Abstract

Cockatoos are member of the order Psittaciformes. Indonesia have eight endemic species of  Cockatoos including : Black Palm Cockatoo (Probosciger aterrimus), Moluccan Cockatoo (Cacatua moluccensis), Tanimbar Cockatoo (Cacatua goffiniana), White Crested Cockatoo (Cacatua alba), Galerita or Triton Cockatoo (Cacatua galerita), Little Corella Cockatoo (Cacatua sanguinea ), Lesser Cockatoo (Cacatua sulphurea) and Citroon Cockatoo (Cacatua sulphurea citrinocristata). Genetic studies are currently considered an appropriate method for studying species relationships. This research aimed to determine the relationship of endemic Indonesian Cockatoos genus Cacatoa using COI gene in silico. The COI gene sequence for each individual cockatoo was accessed through National Center for Biotechnology (NCBI) data, sequence alignment and phylogenetic tree reconstruction using software mega version 11. The results of the phylogenetic tree reconstruction showed that the Indonesian endemic cockatoogenus Cacatoa were grouped into three clusters. The three clusters were the cluster of C. galerita and C. sulphurea, the cluster of C. goffiniana and C. sanguinea, and the cluster of C. alba and C. moluccensis.
Pengaruh Penggunaan Lembar Kerja Berbasis Inkuiri Kontekstual terhadap Kemampuan Berfikir Tingkat Tinggi Mahasiswa dalam Pembelajaran Biologi Air Kusumawati, Diah; Nasution, Unita Sukma Zuliani; Haryati, Haryati
Journal of Natural Sciences Vol 4, No 3 (2023): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v4i3.439

Abstract

This research aims to investigate the impact of using contextual inquiry-based worksheets on the higher-order thinking skills of students in aquatic microbiology. The study employed a quasi-experimental design with pretest-posttest measures. The research population comprised six classes, and samples were drawn from three classes determined through random sampling, namely Regular Class (A) with 40 students (application of contextual inquiry-based worksheets), Extension Class (A) with 25 students (application of Problem-Based Multimedia Pedagogy - PBMP worksheets), and Extension Class (B) with 22 students (application of conventional worksheets). Data analysis was conducted using the Anacova method with SPSS 23.00 for Windows. Data were collected through descriptive test instruments in the form of essays and questionnaires. The results of the data analysis indicated that contextual inquiry-based worksheets yielded better outcomes compared to both contextual PBMP and conventional worksheets. The mean score for higher-order thinking skills was 86.93, with a significance level of 0.034, which is less than 0.005.
Karakterisasi Kerusakan Fisik, Proses Pembusukan dan Jamur Pembusuk pada Buah dan Sayur Rahmiati, Rahmiati; Situmorang, Toberni S; Simanjuntak, Helen Anjelina; Karnina, Sisca; Fadilla, Zahira
Journal of Natural Sciences Vol 5, No 2 (2024): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i2.617

Abstract

Physical damage and post-harvest decay in fruits and vegetables are common issues that can reduce product quality and shelf life. This study aims to understand the decay process and characteristics of spoilage fungi in several types of fruits and vegetables. This descriptive qualitative research used the streak plate isolation method and block square identification. The samples used included salak, grapes, oranges, potatoes, long beans, and cabbage, all of which were fresh and of good quality. Each sample was weighed to 50 gr and placed in a sterile container. Observations of the physical characteristics of the samples were conducted from day 2 to day 8, including identifying the growing spoilage fungi. The results showed the presence of six spoilage fungi coded as JPS1, JPA1, JPJ1, JPK1, JPP1, and JPU1 from each sample. These fungi exhibited varying morphological characteristics based on colony color, spore color, and fungal size. Identification revealed that isolates JPS1, JPA1, JPJ1, and JPU1 belong to the genus Aspergillus sp., isolate JPK1 to the genus Trichocladium sp., and isolate JPP1 to the genus Rhizopus sp.
Tingkat Kepatuhan Pelaksanaan Protokol Kesehatan, Penggunaan Masker Dan Penanganannya Pada Pekerja Sektor Formal Veronika, Erna; Irfandi, Ahmad; Azteria, Veza; Simatupang, Meithyra Melviana
Journal of Natural Sciences Vol 5, No 1 (2024): Journal of Natural Sciences Maret
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i1.458

Abstract

One of the highest clusters of COVID-19 cases in DKI Jakarta is the office cluster, attributed to the lack of compliance among employees with health protocols. The potential transmission to employees' families exacerbates the situation, even leading to temporary workplace closures. An initial survey revealed that 53.3% of employees do not adhere to COVID-19 health protocols in the workplace. This study aims to evaluate the compliance level with health protocols, mask usage, and mask waste management among formal sector workers in DKI Jakarta. The research follows a descriptive method with a cross-sectional design. Data were collected via Google Form from all office workers in DKI Jakarta (n=288) using purposive sampling. Results indicate that 43.8% of workers do not comply with health protocols, 66% do not properly manage used masks, increasing contamination risks, and only 28.5% use N95/KN95/KF94 masks. Companies are urged to enforce surveillance and impose sanctions for policy violations.
Keanekaragaman Jenis dan Potensi Pemanfaatan Tanaman Obat di Pekarangan Rumah Kalibata Pulo, Jakarta Selatan Muliyah, Evi; Huda, Nuril; Putri, Nurhaliza Alya
Journal of Natural Sciences Vol 5, No 2 (2024): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i2.584

Abstract

This study aims to explore the diversity and potential utilization of medicinal plants in home gardens in Kalibata Pulo. Medicinal plants in the yard can be used immediately when needed. The method used was a field survey in twelve residents' yards and interviews. The survey results identified fourteen types of medicinal plants used, including salam (Syzygium polyanthum), binahong (Anredera cordifolia), kelor (Moringa oleifera), aloe vera (Aloe vera), pandan (Pandanus amaryllifolius), suji (Dracaena angustifolia), tapak dara (Vinca rosea), insulin (Smallanthus sonchifolius), red betel (Piper ornatum), green betel (Piper betle), noni (Morinda citrifolia), lemongrass (Cymbopogon citratus), turmeric (Curcuma longa Linn), and kencur (Kaempferia galanga). These plants have various benefits, such as treating coughs, external wounds, diabetes, rheumatism, and fever. The parts commonly used are leaves, but some also use roots, flowers, fruits, and rhizomes. The utilization can be in the form of beverages or direct application, such as aloe vera gel.
Investigasi Kualitas Air Pada Daerah Aliran Sungai Pisang Kota Padang-Sumatera Barat Tanjung, Denny Akbar
Journal of Natural Sciences Vol 4, No 3 (2023): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v4i3.438

Abstract

The aim of this research is to test water quality, including pH, conductivity, total dissolved solids (TDS), salinity, and turbidity. The research method uses quantitative methods. The research area includes 10 sample points around the Pisang river basin, Bungus Teluk Kabung, Padang, and West Sumatra. Samples were measured using a predetermined measuring instrument with three repetitions. Based on test results in all study areas, several water quality testing parameters met the standards of Ministry of Health Regulation No. 2 of 2023, such as pH and total solid density. Meanwhile, other parameters, such as salinity, conductivity, and turbidity, are still far from the predetermined thresholds. Treatment needs to be carried out so that the water can be used according to needs.

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