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All Journal E-Journal Home Economic and Tourism SPEKTRUM: Jurnal Pendidikan Luar Sekolah (PLS) ISTEK
Pertiwi, Rahmi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Other

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PENGARUH SUBSTITUSI KULIT SEMANGKA TERHADAP KUALITAS ES KRIM Pertiwi, Rahmi; Syarif, Wirnelis; Holinesti, Rahmi
Journal of Home Economics and Tourism Vol 15, No 2 (2017): Periode September 2017
Publisher : Faculty of Tourism and Hospitality - Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (76.713 KB)

Abstract

The background of this study was the lack of utilization of watermelon peel onvariation of foods because it was considered not beneficial, so it became unuseblewaste, whereas watermelon peel has nutritional content and was a potential source ofpectin that can prevent ice cream quickly melted. The purpose of this research was toanalyzed substitution effect of watermelon peel as much as 10%, 15% and 20% tothe quality of color, aroma, texture and taste of ice cream. This type of research waspurely experimental with a completely randomized design method. The data usedwere primary data sourced from 30 semi-trained panelists by proposed theorganoleptic test format. Analyzed of data using ANAVA, if Fcount> Ftable thencontinued with Duncan test. The result of the research showed that there was asignificant influence of watermelon peel substitution on ice cream quality as much as20% produced the best quality, covering aroma (watermelon peel), texture (smooth),texture (not crystalized) and texture (not easy to melted).Keywords: Watermelon peel, Ice Cream, Quality
Development of Vocabulary Cards as Learning Media to Improve the English Vocabulary of Fourth Grade Elementary School Students Andriani, Cesilia; Novrianti, Novrianti; Pertiwi, rahmi; Masnur, Alkadri
SPEKTRUM: Jurnal Pendidikan Luar Sekolah (PLS) Vol 13, No 3 (2025): SPEKTRUM: Jurnal Pendidikan Luar Sekolah (PLS): Publishing August 2025
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/spektrumpls.v13i3.135176

Abstract

The purpose of this research was to develop vocabulary card learning media to improve the English vocabulary mastery of fourth-grade elementary school students. This study was motivated by the limited availability of engaging visual learning media in elementary schools, accompanied by students’ low English vocabulary mastery. This development aimed to describe and present an overview of vocabulary card learning media as an alternative instructional tool, as well as to determine the validity and practicality levels of the developed product.This research employed a Research and Development (R&D) approach using the 4D development model, which consists of the Define, Design, Develop, and Disseminate stages. The development stage served as the benchmark for the success of the media, as it involved expert assessments through validity tests and product trials for practicality testing. The validity tests consisted of two phases: the media and linguistic validity tests conducted by media and language experts, and the content validity test conducted by the fourth-grade homeroom teacher of SD IT Baitul Hamdi. After the validity tests, a practicality test was conducted with the fourth-grade students of SD IT Baitul Hamdi.The vocabulary card learning media, covering the topics It’s Seven O’Clock, Daily Activities, and This Is My Bicycle, obtained a “very valid” rating in the first media and linguistic validity test with an average score of 4.57 from two validators and was declared feasible with revisions. In the second validity test, the media achieved an overall “very valid” score of 4.97 and was deemed suitable for field testing without revisions. The content validity test achieved a “very valid” result with an average score of 4.89, while the practicality test yielded a “very practical” result with an overall average of 4.55. Based on the validity and practicality results, it can be concluded that the vocabulary card learning media is ready to be implemented and is practical for use in the teaching and learning process. The disseminate stage was carried out by distributing the product to the Teacher Working Group (KKG) of Cluster 6, which consists of representatives from nine elementary schools in the research area through a representative teacher from SD IT Baitul Hamdi, with the handover proven by an official handover letter.
THE EFFECT OF POLYVINYL PYROLYDONE (PVP), EXPLANT TYPE, AND EXPLANT PLANTING POSITION ON CALLUS GROWTH OF CIKONENG ST LARGE ORANGE (Citrus maxima (Burm.) Merr) AND SWEET ORANGE (Citrus sinensis (L.) Osbeck) Chaidir, Liberty; Pertiwi, Rahmi
ISTEK Vol. 14 No. 2 (2025)
Publisher : Fakultas Sains dan Teknologi UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/istek.v14i2.1339

Abstract

Cikoneng ST Orange (Citrus maxima (Burm.) Merr) is a germplasm of Sumedang area, which has been scarce for the past few years. The high percentage of browning in Cikoneng ST Orange explants is considered to be the cause of the low percentage of research success. Sweet Orange (Citrus sinensis (L.) Osbeck) is a type of orange that has been widely used as a potential orange explant in tissue culture. This study was conducted to determine the comparison of growth percentage by conducting cross-species research between Cikoneng ST Orange and Sweet Orange. The study was conducted at the Tissue Culture Laboratory of the Agrotechnology Department, Sunan Gunung Djati State Islamic University, Bandung from March to June 2017. The media used was a combination of MS media, 2 mg L-1 2.4 D, and 0.5% PVP. The explants used were leaves and leaf shoots of Cikoneng ST Orange and Sweet Orange. The planting positions of the explants included abaxial and adaxial planting positions. The study was analyzed using a descriptive method. The results showed that the administration of PVP in MS media and 2 mg L-1 2.4 D could induce callus of Sweet Orange at 3 DAI and Cikoneng ST Orange at 5 DAI. The use of leaf shoot explants and adaxial planting position produced the best friable callus up to 28 DAI. This study also found that Sweet Orange had the fastest callus growth time and a low browning percentage compared to Cikoneng ST Orange explants.
Co-Authors Alkadri Masnur Andriani, Cesilia Liberty Chaidir, Liberty Novrianti Rahmi Holinesti Wirnelis Syarif