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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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Pengaruh Gel Lidah Buaya Terhadap Pertumbuhan Stek Bangun-Bangun (Plectranthus amboinicus) Husniatunnisa, Husniatunnisa; Arwita, Widya; Nurkhofifah, Indah; Sastra, Siti Fathiya Dwinda
Journal of Natural Sciences Vol 6, No 1 (2025): Journal of Natural Sciences Maret
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i1.704

Abstract

Bangun-bangun (Plectranthus amboinicus) is a herbal plant that is widely used as a lactagogum to increase breast milk production. However, the propagation of this plant still faces obstacles, especially in the process of stem cuttings that require the support of growth stimulants. Aloe vera is known to contain growth hormones such as auxin and gibberellin which have the potential to increase the success of plant cuttings. This study aims to analyze the effect of giving aloe vera gel on the growth of bangun-bangun plant cuttings. The research method used is a qualitative approach with direct observation of the growth of bangun-bangun plant cuttings treated with aloe vera gel with various concentrations. The data collected included root length, number of shoots, number of leaves, and cutting viability. The results showed that giving aloe vera gel had a significant effect on cutting growth. Certain concentrations of aloe vera gel can increase the percentage of successful cuttings, accelerate root formation, and increase the number of shoots and leaves compared to cuttings that are not given treatment. The mechanism of action of active compounds in aloe vera that play a role in stimulating root and shoot growth, as well as environmental factors that also affect the effectiveness of the treatment. The results of this study provide implications for the vegetative propagation of bangun-bangun plants and can be a natural alternative in supporting the cultivation of herbal plants.
Optimization of Cellulase Enzyme Production from Corn Cob Waste by Cellulolytic Fungus Aspergillus niger Yuliandini, Sinta; Peristiwati, Peristiwati; Surakusumah, Wahyu
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.916

Abstract

Corncob is an agricultural waste rich in cellulose, making it a promising alternative substrate for cellulase enzyme production, which is widely used in various industrial applications such as bioenergy, food, and textile industries. Aspergillus niger is a well-known cellulolytic fungus capable of efficiently producing cellulase enzymes. This study aimed to optimize cellulase production by A. niger using corncob powder (Zea mays) as a substrate through submerged fermentation (SmF), with variations in temperature (29.5°C and 30.5°C) and pH (4.5 and 5.5). The cellulolytic activity of A. niger was tested on CMC agar medium. Cellulase activity was analyzed based on the concentration of reducing sugars using the DNS method. The highest enzymatic activity was recorded at 1.125 IU/mL with a biomass yield of 0.754 mg/mL at 30.5°C and pH 4.5. These findings suggest that optimizing environmental conditions and utilizing corncob waste as a carbon source can enhance cellulase production by A. niger, offering a sustainable and cost-effective approach for enzyme-based industries.
Jenis Ekstrak Tanaman sebagai Mollusida Nabati terhadap Hama Parmarion martensi pada Tanaman Kubis secara In Vitro Azwana, Azwana; Kuswardani, Retna Astuti; Sarumaha, Agustinus
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.680

Abstract

Parmarion martensi is a major pest of cabbage crops, causing damage that reduces both quality and market value. The use of botanical pesticides as an alternative control method has not been widely studied. This study aimed to evaluate the effectiveness of extracts from Aegle marmelos (maja fruit), Azadirachta indica (neem leaves), and Carica papaya (papaya leaves) in controlling P. martensi. The experiment was conducted using a Completely Randomized Design (CRD) with 11 treatments and 3 replications. Treatments included a negative control (A0), synthetic pesticide (A1), and plant extracts at concentrations of 20%, 25%, and 30% (A2–A10). The results showed that neem leaf extract at 30% (A7) produced the highest mortality rate, reaching 93.3% at 5 days after application (DAA), with an average feed consumption of 0.39 g/day. Probit analysis indicated an LC₅₀ of 20.3% and an LT₅₀ of 3.6 days, suggesting a strong toxic effect. These findings indicate that neem leaf extract at 30% concentration has potential as a botanical molluscicide to replace chemical pesticides.
Pengaruh Model PjBL Dengan Pendekatan Experiential learning Terhadap Kompetensi Siswa Lubis, Citra Aulianisa; Chamisijatin, Lise; Zaenab, Siti
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.895

Abstract

This study aims to determine the influence and achievement of competency from the PjBL learning model with the Experiential learning approach. The research method used is quantitative Pre-experiment through the One Group Pretest-Posttest design approach. The study was conducted on students of class VIII IPA SMP Muhammadiyah 02 Batu City. The instruments used were pretest and posttest assessments. In data analysis using paired t-test. The results showed that the application of the PjBL model with the Experiential learning approach had a significant influence on learning outcomes (Sig = 0.001 0.05) and student competency achievement which can be seen based on increased learning outcomes, achievement of attitude values and skills. Overall, students also get memorable experiences during the learning stages of the PjBL learning model through the Experiential learning approach.
Inokulasi Mikrokapsul Bakteri Rizosfer Dari Tanah Erupsi Sinabung Sebagai Booster Pertumbuhan Bibit Kopi Robusta (Coffea canephora L.) Tarigan, Rico Kris Hadinata; Warsito, Kabul; Setiawan, Andi
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.920

Abstract

This study evaluated the effect of rhizosphere bacteria microcapsule fertilizer and chicken manure fertilizer on the growth of robusta coffee seedlings (Coffea canephora L.) in an effort to develop environmentally friendly superior seedlings. Using a two-factorial Completely Randomized Design with 16 treatments and 5 replications, variations in doses of chicken manure fertilizer (0, 100, 200, 300 grs) and rhizosphere bacteria microcapsules (0, 5, 7.5, 10 grs) were tested. The results showed that a dose of 100 grs of chicken manure fertilizer (K1) gave the best growth response in all parameters, with plant height reaching 51.40 cm at 4 BSPT, an increase of 44.8% compared to the control. Root length showed a non-linear response pattern, where K1 produced the highest root length (30.68 cm²) and the highest dose (K3) produced the lowest root length (24.36 cm²). The number of leaves and leaf area also increased significantly in the K1 treatment compared to the control. Rhizosphere bacteria microcapsules provide positive effects through root growth stimulation and phytohormone production that increases nutrient absorption efficiency. These findings emphasize the importance of optimizing the dosage of chicken manure fertilizer and rhizosphere bacteria microcapsules for sustainable robusta coffee seedling growth.
Uji Efektivitas Jus Buah Naga Merah (Hylocereus polyrhizus) dalam Meningkatkan Hemoglobin pada Karyawan RS Sri Pamela Sabnita, Rara; Suharsih, Suharsih
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.684

Abstract

Anemia is a common health issue frequently experienced by individuals in the productive age group, including healthcare workers, and is generally caused by iron deficiency. Red dragon fruit (Hylocereus polyrhizus) is known to contain iron and vitamin C, which may help increase hemoglobin levels. This study aimed to determine the effect of red dragon fruit juice on the hemoglobin levels of employees at Sri Pamela Hospital, Tebing Tinggi. A pre-experimental design with a one-group pretest-posttest approach was used involving 30 respondents (10 males and 20 females) who consumed 200 mL of red dragon fruit juice daily for 10 consecutive days. Hemoglobin levels were measured before and after the intervention using the Drabkin method and an automated hematology analyzer. Statistical analysis using a paired sample t-test showed a significant increase in hemoglobin levels, both in male (14.99 to 16.33 g/dL) and female (13.51 to 15.35 g/dL) participants, with a p-value of 0.000. In conclusion, red dragon fruit juice effectively increases hemoglobin levels and has potential as a natural nutritional intervention for the prevention of mild anemia.
Perspektif Guru dan Siswa terhadap Pelaksanaan PjBL dengan Pendekatan Experiental Learning pada Pembelajaran IPA Rahmahabibty, Corina Destya; Chamisijatin, Lise; Zaenab, Siti
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.896

Abstract

This study aims to determine the implementation of Project Based Learning through experiential learning, teacher and student perspectives on the implementation of learning, and to determine the achievement of student competencies. The method used is qualitative with systematic observation instruments, non-systematic observations, surveys to students, and interviews with teachers. The results of the study showed that the perspectives of teachers and students were considered positive. The teacher's perspective stated that students were involved in learning that encouraged student activeness so that real experiences were formed. While the student perspective, it was conveyed that they felt excited, happy, motivated, and experienced direct involvement that allowed understanding of the material to be achieved. The implementation of learning had an impact on the achievement of student competencies with the results of an increase in knowledge scores (the average increased from 59.03 to 77.55), as well as an increase in attitude and skill scores, with an average skill reaching 83.33 and the majority of students achieving A and B scores.
Efektivitas Media Audio Visual dalam Pembelajaran Sistem Pencernaan Manusia di Kelas VIII SMP Parinduri, Wina Mariana; Rambe, Titin Rahmayanti; Lubis, Renni Ramadhani; Anggraini, Dini Puji; Kesumawati, Diah
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.921

Abstract

This study aims to determine the effectiveness of audio-visual learning media in improving student learning outcomes on the topic of the human digestive system in Grade VIII at SMP Al-Maksum. The method used was a quasi-experimental design with a quantitative approach. Data collection instruments included observation, learning outcome tests (pre-test and post-test), and documentation. The results showed an increase in student learning outcomes after the implementation of audio-visual media. During the pre-test, only 6 students (28.57%) achieved the minimum passing score (≥ 70), with an average score of 57. After being taught using audio-visual media, the number of students who met the minimum passing criteria increased to 18 (85.7%) with an average post-test score of 80. The N-Gain analysis showed a score of 55.14%, which falls into the “moderately effective” category. Therefore, audio-visual learning media are considered moderately effective in enhancing student learning outcomes on the digestive system topic and are recommended as an alternative instructional medium in science learning at the junior high school level.
Studi Etnobotani: Inventarisasi dan Pemanfaatan Tumbuhan Obat di Desa Pelabai Kabupaten Lebong, Provinsi Bengkulu Safniyeti, Safniyeti; Astuti, RR Sri; Fatimatuzzahra, Fatimatuzzahra; Kasrina, Kasrina; Nugraha, Fadel
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.941

Abstract

Traditional medicinal plants hold a crucial role in public health in rural areas where medical facilities are limited. People often rely on plants as medicinal raw materials. This study aims to investigate ethnobotany and inventory the types of medicinal plants used by the residents of Pelabai Village, Lebong Regency, Bengkulu Province. Data were collected through interviews using snowball sampling and analyzed desriptively. Semi-structured interviews with open-ended questions and direct observations of daily activities were conducted. Twenty respondents who knew, understood, and used plants as alternative medicine were selected. The study identified 30 plant species in the village used for traditional medicine. Leaves were the most commonly used plant part for medicinal purposes (76.67%), followed by stems (23.33%), rhizomes (13.33%), roots (10%), sap (6.67%), and other parts such as gel, flowers, fruit, and stem bark (3.33%). The plants were prepared for medicinal use through boiling, mashing, grating, dripping, squeezing, sticking, chewing, or direct consumption. Plant were used to treat various minor ailments including nausea, aches, skin diseases, beauty enhancement, respiratory issues, cholesterol, and hypertension.
Systematic Literature Review: Pengembangan LKPD Berbasis Problem Based Learning (PBL) pada Materi Sistem Pencernaan Manusia Yuliastrin, Adisti; Yovita, Yovita; Pratiwi, Tiara Alvionita; Yusrianto, Edi; Vebrianto, Rian
Journal of Natural Sciences Vol 6, No 2 (2025): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i2.897

Abstract

The transformation of education from the Industrial Revolution 4.0 to Society 5.0 demands the development of 21st-century skills. In science learning, the human digestive system is considered complex, requiring adaptive instructional media. A systematic literature review using the PRISMA method was conducted on 20 articles from Scopus, Google Scholar, and Connected Papers (2020–2024). Inclusion criteria focused on the development of Problem-Based Learning (PBL)-based student worksheets (LKPD) and content related to the digestive system. About 85% of the articles targeted the junior high school level. All studies reported that PBL-based LKPD improved conceptual understanding, critical thinking, collaboration skills, and scientific literacy. Approximately 60% incorporated interactive technology-based media. PBL-based LKPD is proven to be feasible and effective in supporting the Merdeka Curriculum and fostering contextual and meaningful learning in the digital era.

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