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Lalu Japa
University of Mataram
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Pengembangan Modul Pembelajaran Biologi Cacing Nyale untuk Guru dan Siswa Imam Bachtiar; Baiq Sri Handayani; Lalu Japa; Syamsul Bahri
Jurnal Penelitian Pendidikan IPA Vol. 8 No. 2 (2022): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i2.1322

Abstract

Despite a long tradition of harvesting nyale in southern coast of Lombok island teacher’s understanding on the animal producing nyale are very low. This study aimed to develop a learning module of nyale worm biology for teachers and students. The developmental research method was adapted from the Borg and Gall model which includes 10 steps. Data on module feasibility were collected through a process of validation of the learning module. Questionnaires on the student’s and teacher’s responses to the learning module were administered to assess module practicability. The data were analyzed using descriptive statistics. The results showed that the feasibility of the subject material was 85.90%, the media feasibility was 81.71%, and the user test was 81.09%. The learning module of nyale worm biology is very valid, effective, and practical as a supporting book for learning biology at high schools
Pembelajaran Biologi Cacing Nyale Melalui Pendekatan Saintifik Berbantukan Video Pembelajaran untuk Meningkatkan Kemampuan Berfikir Kritis Siswa SMAN di Kota Mataram Baiq Sri Handayani; Imam Bachtiar; Syamsul Bahri; Lalu Japa
Jurnal Penelitian Pendidikan IPA Vol. 8 No. 2 (2022): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i2.1398

Abstract

The research was carried out with the aim of knowing the effectiveness of the video-assisted scientific approach on students' critical thinking skills. The study used a quasi-experimental method. The research was carried out on high school students in the city of Mataram with a total sample of 323 as the research sample. Data Inferential analysis with Analysis of Covariance (ANACOVA) followed by Least Significance Difference (LSD), was used to test the research hypothesis. The results showed that the learning approach had a significant effect on learning activities with an F hit value of 60.37. The scientific approach is not significantly different from the video-assisted scientific approach, but is significantly different from the conventional approach with a mean value of 62.17 for video-assisted scientific approaches and an average of 64.69 and a conventional approach of 47.48. The video-assisted scientific approach improves students' critical thinking skills.
Evaluation of Insecticidal Performances of Jayanti Plant (Sesbania sesban) for Integrated Control of Cabbage Caterpillar (Plutella xylostella) Suripto Suripto; Lalu Japa; Hilman Ahyadi; Rachmawati Noviana Rahayu
Jurnal Penelitian Pendidikan IPA Vol 9 No 10 (2023): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i10.5635

Abstract

The study on the use of local natural materials as a source of insecticides is intended, among other things, to reduce farmers' dependency on using synthetic chemicals. This research was conducted to obtain the most selective insecticidal active ingredient from Sesbania sesban plant for controlling cabbage caterpillars, choose a target mode of action that has a safe impact on the environment, and determine insecticidal stability during storage of the material prior to application and its stability in water after application.  The dried powder of S. sesban leaves was extracted in stages using a series of solvents, namely hexane, DCM, ethanol and water, respectively.  Each of the extract fractions produced was tested for its lethal toxicity against Plutella xylostella larvae and Diadegma semiclausum imago. Each of mortality data were processed by probit analysis to produce LC50(s) to determine their insecticidal selectivity. Subsequent bioassays were carried out using extract-water of S. sesban leaves and the data were processed by probit analysis to determine their anti-ovipositor, ovicidal powers and anti-feedant properties against P. xylostella. The insecticidal stability of S. sesban was also studied according to variations in the storage time of the simplicia before extraction, the storage time of the extract before dissolution, and its stability in water during application. The data was processed using ANOVA. The results show that the insecticidal activity of the ethanol extract fraction of S. sesban leaves for controlling cabbage caterpillars was very selective, namely very toxic to P. xylostella but very less toxic to D. semiclausum. Against P. xylostella, S. sesban leaf extract has also been proven to significantly prevent oviposition, inhibit egg hatching and feeding activity. The insecticidal power of S. sesban did not decrease significantly during storage of the simplicia for less than three months and during storage of the extract for less than seven days. However, the toxicity of the extract solution decreased drastically after 24 hours of application
A Strengthening Strengthening Microalgae Biodiesel Production Capacity Based on Strain Selection for Chaetoceros amini, Nannochloropsis oculata and Nitzschia spp. Suripto Suripto; Lalu Japa
Jurnal Penelitian Pendidikan IPA Vol 10 No 12 (2024): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i12.9589

Abstract

Increasing microalgae biodiesel production through improvement of biomass production is reversible and is often considered economically unprofitable. This research aims to determine the effect of various levels of media salinity stress in producing microalgae strains that have higher oil content than the original population. Three species of microalgae are known to be capable of producing biodiesel, namely Chaeticheros amini, Nannochloropsis oculata and Nitzschia spp. isolated from Sekotong coastal waters, West Lombok, then cultivated in bioreactor systems for seven days with salinity stress treatment to produce strains. The resulting strains were cultivated again, but without salinity stress. Microalgae cell density was observed every day and harvested on the seventh day. The resulting microalgae biomass was extracted in stages to produce biodiesel oil. The results showed that after cultivation under salinity stress, S20, S25, S30, and S35 strains were produced from each of these species. Under salinity stress, all strains except S25 of Nitzschia spp. showed a higher maximum cell density compared to the original population and were reversible respectively. Each of the S25 strains of C. amini and N. oculata, S20 and S25 strains of Nitzschia spp., had a higher oil content than the original population, each of which was permanent
Co-Authors Baiq Sri Handayani Hilman Ahyadi Imam Bachtiar Rachmawati Noviana Rahayu Suripto Suripto Syamsul Bahri