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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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Studi Literatur Potensi Binahong (Anredera cordifolia) dalam Pengobatan Luka Nasution, Jamilah; Ramadhani, Citra Suci; Marianti, Marianti
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.v5i2.468

Abstract

Binahong (Anredera cordifolia) is a medicinal plant that has long been used in traditional medicine to heal wounds and various other health conditions. This study aims to review the therapeutic benefits of Binahong in wound healing through an analysis of recent scientific literature. The method used in this research is a literature review, where data were collected from various scientific journals discussing the bioactive components and pharmacological effects of Binahong. The analysis results show that Binahong contains flavonoids, saponins, and alkaloids that have anti-inflammatory, antioxidant, antibacterial, and analgesic activities. Flavonoids such as quercetin and kaempferol reduce oxidative stress and inflammation, while saponins enhance collagen production and tissue regeneration. Alkaloids provide analgesic effects that reduce pain in wounds. Clinical studies also indicate that topical application of Binahong extract accelerates wound healing and reduces the risk of infection.
Kejadian Stres Kerja Pada Petugas Laboratorium Di Rumah Sakit X Menggunakan Dass 42 Tahun 2023 Kusumawati, Utari; Irfandi, Ahmad; Utami, Desyawati; Azteria, Veza
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.v5i1.461

Abstract

Work stress experienced by laboratory officers in hospitals could have been influenced by various factors, including limited human resources that encouraged multiple roles for each laboratory officer. This could increased the risk of other mental health disorders. The purpose of this study was to determine the incidence of work stress in laboratory officers at Hospital X. This research method was quantitative descriptive research. The sampling technique used in this study was total sampling with total sample size of 17 laboratory officers at Hospital X. This study used the DASS 42 questionnaire. The primary data was processed using univariate analysis to determine the distribution and frequency of data. The findings of this study revealed that the majority of laboratory officers at Hospital X had experienced moderate levels of depression, namely 5 respondents (29.4%). Regarding anxiety levels, the majority of laboratory officers at Hospital X experienced moderate and severe levels of anxiety, with 5 respondents each (29.4%). The majority of Hospital X laboratory officers experienced moderate and normal level of stress, with 5 respondents each (29.4%). It is hoped that hospital management could consider adding human resources and providing facilities and infrastructure to minimize the risk of work stress.
Analisis Pengetahuan Siswa SMAN X Kota Tangerang Selatan Mengenai Konsep Keselamatan dan Kesehatan Kerja (K3) Laboratorium Biologi Sanusih, Dhea Khoiriyah; Yuliana, Dewi; Haisy, Meilika; Saidah, Nida Haura; Muliyah, Evi
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.v5i2.587

Abstract

The branch of science that requires students to conduct experiments is Biology. Experiments are carried out in specialized places such as laboratories. To minimize accidents, an understanding of Occupational Safety and Health (OSH) is necessary. This study aims to describe students' knowledge and the completeness of laboratory equipment supporting OSH in the Biology laboratory at SMAN X in South Tangerang City. This research employs qualitative methods through observation, questionnaires, and interviews with biology teachers. Observations show that the laboratory is neatly arranged, equipped with OSH tools such as first aid kits, organic and inorganic waste bins, safety notices, and more. Based on the questionnaire results, it was found that the knowledge of OSH concepts in the Biology laboratory at SMAN X South Tangerang City is quite good. This is evidenced by scores showing results above 8.00.
Penapisan Bakteri Asam Laktat dari Susu Fermentasi Bermerek Yang Dijual di Pasar Swalayan Jalan Setiabudi Medan Rahmiati, Rahmiati; Situmorang, Toberni S.; Simanjuntak, Helen Anjelina; Ratna A.K Marpaung, Dwi
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.v4i3.441

Abstract

Lactic acid bacteria are a group of gram-positive bacteria that are able to ferment carbohydrates and produce lactic acid as a result of their metabolism. Lactic acid bacteria can be found naturally in the digestive tract of animals and plants. Apart from that, lactic acid bacteria are also used as a starter in the fermentation process. One of the fermented products that is processed using lactic acid bacteria is fermented milk, also known as yoghurt. Fermented milk is marketed under various trademarks. This research aims to characterize lactic acid bacteria isolates from branded fermented milk sold in supermarkets. The research was carried out using a qualitative descriptive method with stages namely sample preparation, isolation and characterization. Screening for lactic acid bacteria uses pour plate and streak plate methods. The results of the research showed that three isolates of lactic acid bacteria were obtained from the samples tested with different macroscopic characteristics, namely SFB01, SFB02 and SFB03. These three isolates were gram positive bacilli.
Faktor-Faktor Yang Berhubungan dengan Kejadian ISPA Pada Usia 0-4 Tahun di Puskesmas Kecamatan Tambora Fatimah, Siti; Nitami, Mayumi; Mustikawati, Intan Silviana; Veronika, Erna
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.v5i1.463

Abstract

Based on data from the Tambora District Health Center from 2021-2023, it shows an increase in ISPA cases at ages 0-4 years from 49.5%, 57.2%, 58.8%. The aim of this study was to determine the factors associated with the incidence of ARI at the age of 0-4 years at the Tambora District Health Center. This research used a Cross Sectional design with a sample of 66 respondents. Data analysis used univariate and bivariate analysis with the Chi Square test. The results of univariate analysis showed that more people experienced ARI (71.2%), mothers with low education (51.5%), age at risk (89.3%), not exclusively breastfed (57.6%), incomplete immunization ( 53%), nutritional status with normal body weight (68.2%), risky family smoking behavior (71.2%). There is a relationship between the incidence of ARI at the age of 0-4 years with maternal education (PR=1.824, 95% CI: 1.270-2.619), exclusive breastfeeding (PR=1.927, 95% CI: 1.276-2.911), immunization status (PR= 1.890, 95% CI: 1.295-2.756). Meanwhile, variables that did not have a relationship between the incidence of ARI were age under five (PR=1.275, 95% CI: 0.659-2.468), nutritional status and family smoking behavior (PR=1.179, 95% CI: 0.805-1.728).
Pengaruh Discovery Learning Berbantuan Simulasi PhET terhadap Minat dan Hasil Belajar Siswa SMPN 1 Siatas Barita pada Materi Getaran dan Gelombang Sihotang, Johan; Sabani, Sabani
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.v4i3.428

Abstract

This research aims to evaluate the impact of the Discovery Learning model using interactive PhET simulations on students' interest and learning outcomes at SMPN 1 Siatas Barita, particularly in the subject of Vibrations and Waves. PhET simulations incorporate animated and interactive elements, designed akin to games to facilitate exploratory learning for students. The research employed a Quasi-experimental method with a Non-Equivalent Control Group Design, where class VIII-1 served as the experimental group and class VIII-2 as the control group. The instruments utilized included learning tools, written tests, and questionnaires for data collection. Data analysis was conducted through hypothesis testing using Multivariate Analysis of Variance (MANOVA). The results revealed a significant influence of the Discovery Learning model assisted by PhET simulation on students' interest and learning outcomes in Vibrations and Waves at SMPN 1 Siatas Barita. Homogeneity analysis of the variance/covariance matrix indicated no variance matrix differences in the interest and learning outcomes of students between classes VIII-1 and VIII-2. The multivariate test results showed a low significance level, leading to the conclusion that the Discovery Learning model with PhET simulation assistance has a positive impact on students' interest and learning outcomes in the specified subject.
Pengaruh Waktu Perendaman Zat Warna Poli Kuersetin terhadap Efisiensi Dye Sensitized Solar Cell (DSSC) Putri, Tiara Dwi; Hardeli, Hardeli
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.v5i2.609

Abstract

The demand for electricity in Indonesia will continue to increase. This condition requires an increase in electricity production capacity from new and renewable energy (NRE) sources. The rising demand for electrical energy leads to the depletion of non-renewable natural resources, driving the shift towards renewable resources such as solar energy. Solar energy can be converted into electrical energy known as solar cells. Third-generation solar cells, known as dye-sensitized solar cells (DSSCs), have the ability to generate electrical energy using organic materials. The objective of this research is to improve the efficiency of DSSCs by using polymerized dyes and doping the TiO2 semiconductor with the surfactant CTAB using the sonication method. This research was conducted to achieve optimum efficiency with variations in the dye immersion time in the polyquercetin solution, specifically 10, 20, 30, 40, and 50 minutes. Characterization using UV-DRS was performed to observe the band gap energy of the semiconductor. The results of the study showed that the DSSC tested for current and voltage with a digital multimeter yielded the lowest efficiency of 7.9% with a 10-minute immersion time and an optimum efficiency of 19.3% with a 30-minute immersion time.
Penerapan Lesson Study melalui Project Based Learning (PjBL) Pada Mata Pelajaran IPA SMP Huda, Muhammad Khomarul; Sinaga, Yuliana K. B.; Saragih, Sarlina
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.v5i1.444

Abstract

This article discusses the implementation and application of "Lesson Study based on Project Based Learning" in science subjects in junior high schools. The aim of this research is to explain the implementation of lesson study based on Project Based Learning. The research method used is the literature study method. The research results show that the application of lesson study based on project based learning can improve teacher professionalism and pedagogical skills, the quality of education in schools, improve learning outcomes, student activities, creative thinking skills, and increase information literacy in the 21st century.
Pemantauan Kualitas Air Sungai di Kabupaten Tasikmalaya Meylani, Vita; Mutiara, Frista; Muslim, Farhan Fuadi
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.v5i1.464

Abstract

Monitoring river water quality in Tasikmalaya Regency is an important indicator in determining IKLH (Environmental Quality Index) and the function of water for people's lives. This research was conducted to analyze the results of observations testing physical parameters (color and odor, turbidity, TDS and temperature), chemical (pH and DO/dissolved oxygen) and microbiology (total Coliform and Escherichia coli) taken from 9 river locations in the Regency Tasikmalaya using grab sampling using a descriptive qualitative approach and purposive sampling techniques. The results show that the water quality of 7 of the 9 location points still meets the water quality standards referred to in Appendix IV Government Regulation Number 22 of 2021 (Physical and Chemical Parameters) and Minister of Health Regulation Number 02 of 2023 (Microbiological Parameters). The parameters observed were odor and color with an average of odorless and 159.75 mg/L, turbidity with an average of 61.87 NTU, TDS with an average of 410.58 mg/L, temperature with an average of 27.83, pH with an average of 8.13, Dissolved Oxygen/DO with an average of 6.52 mg/L, Total Coliform with an average of 1079.88 MPN/100 mL, and Escherichia coli with an average of 1080.67 MPN/100 mL. The parameters that mostly exceed water quality standards on average at all sampling points are color, turbidity, DO (Dissolved Oxygen), TDS (Total Dissolved Solid), Total Coliform, and Escherichia coli.
Pengaruh Cekaman Salinitas Terhadap Pertumbuhan Dan Perkembangan Bandotan (Ageratum conyzoides L.) Bahrul Ulum, Fuad; M. Akbar, Salahuddin; Andiana, Jocelin; Rosyadi, Achmad; Setyati, Dwi
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.v4i3.435

Abstract

Salinity stress enhances plants' growth and development, leading to decreased productivity. Ageratum conyzoides L., also known as Bandotan, is an invasive plant that has spread throughout almost all regions in Indonesia. Investigating the adaptation mechanisms of this plant offered insights into the stress tolerance levels to the salininty and was important for the mitigation of the consequences of its invasivenessnature. The objective of this research was to investigate the impact of salinity stress on the growth and development of A. conyzoides.  The study was carried out in a greenhouse between April and May 2022. The plants were grown under two degrees of salinity stress (i.e., 2000 ppm for moderate stress, and 75000 ppm for extreme stress). The results indicated that A. conyzoides was adaptive to moderate salinity conditions. In extreme stress conditions, A. conyzoides expressed stress by decreasing the plant height and total stomata. The plant adapted by developing flowers at a faster rate as a defense mechanism for the propagation of future generations.

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