Article Per Year (5 Year)
p-Index From 2021 - 2026
1.235
P-Index
This Author published in this journals
All Journal Natural Science: Journal of Science and Technology Biocelebes IJoASER (International Journal on Advanced Science, Education, and Religion) International Journal of English Education and Linguistics (IJoEEL) JES (Jurnal Ekonomi STIEP) Jurnal Al-Qiyam Jurnal Tana Mana
Rifka Rifka
Jurusan Biologi Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Tadulako Kampus Bumi Tadulako Tondo Palu, Sulawesi Tengah
Religion Agriculture, Biological Sciences & Forestry Computer Science & IT Economics, Econometrics & Finance Education Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Social Sciences

Published : 9 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 9 Documents
Search

 1 
POLIMORFISME KLON KAKAO (THEOBROMA CACAO L.) DARI PERKEBUNAN RAKYAT KABUPATEN SIGI Rifka, Rifka; Aisyah, Nurul; Muslimin, Muslimin; Suwastika, I Nengah
Natural Science: Journal of Science and Technology Vol 3, No 3 (2014): Volume 3 Number 3 (December 2014)
Publisher : Univ. Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.388 KB)

Abstract

Analisis karakter genotip kakao (Theobroma cacao L.) pada tingkat molekular (DNA) penting dilakukan sebagai langkah awal dalam pemuliaan tanaman untuk menghasilkan klon kakao unggul. Keanekaragaman kakao di perkebunan rakyat Kabupaten Sigi memiliki variasi fenotip dan genotip yang tinggi. Terdapat lebih dari 12 klon kakao yang dapat ditemukan di perkebunan tersebut. RAPD (Random amplified polymorphic DNA) merupakan salah satu penanda molekuler berbasis PCR yang banyak digunakan dalam mengidentifikasi keragaman tanaman. Informasi mengenai jenis primer untuk analisis RAPD pada tanaman kakao khususnya di wilayah Kabupaten Sigibelum pernah dilaporkan.Hasil penelitian ini menunjukkan ketiga primer yaitu TCH05, AS9870 dan TCM20 dapat digunakan dalam mendeteksi variasi genetik setiap klon, kecuali klon Sulawesi 1 dan Sulawesi 2.
VARIASI MORFOLOGI BUAH BEBERAPA KLON KAKAO DARI PERKEBUNAN RAKYAT KECAMATAN SIGI BIROMARU DAN PALOLO SULAWESI TENGAH Mutmainah, Mutmainah; Rifka, Rifka; Muslimin, Muslimin; Suwastika, I Nengah
Natural Science: Journal of Science and Technology Vol 3, No 3 (2014): Volume 3 Number 3 (December 2014)
Publisher : Univ. Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.981 KB)

Abstract

Karakter morfologi buah sangat bermanfaat dalam mengelompokan suatu klon, varietas, dan kultivar. Penelitian ini bertujuan untuk mengetahui variasi morfologi buah kakao pada klon Panter, Irian, ICS 60, Hibrida, Sulawesi 1 dan M01 yang dibudidayakan pada perkebunan kakao rakyat di Kecamatan Sigi Biromaru dan Palolo. Penelitian dilakukan dengan menggunakan metode pengambilan sampel secara purposive sampling.Data yang dikumpulkan bersifat kuantitatifyang meliputi hasil pengukuran terhadap panjang buah, diameter buah, panjang rongga buah, diameter rongga buah, tebal epikarp (eksokarp, mesokarp, dan endokarp), dan jumlah biji pada setiap buah serta ukuran biji (panjang, lebar dan tebal). Data yang bersifat kualitatifmeliputi bentuk buah, konstruksi apeks dan basal serta keadaan alur dan permukaan buah.Hasil penelitian menunjukan buah dari keenam klon menunjukkan ciri morfologi buah  yang bervarisi. Klon Panter merupakan klon dengan rata-rata ukuran buah paling besar dibandingkanklon lainnya. Jumlah biji yang dihasilkan klon ini paling banyak dengan kualitas biji AA.
KARAKTERISTIK PERTUMBUHAN MISELIUM JAMUR TIRAM PUTIH (Pleurotus ostreatus) PADA MEDIUM DASAR JERAMI DAN TONGKOL JAGUNG umrah umrah; I Nengah Suwastika; eny Yuniati; Rifka Rifka; Nurvita Nurvita
Biocelebes Vol. 15 No. 2 (2021)
Publisher : Biology Department, Mathematics and natural science, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/bioceb.v15i2.15621

Abstract

Laju pertumbuhan miselium jamur tiram putih (Pleurotus ostreatus (Jacq) P. Kumm) dengan medium dasar jerami dan tongkol jagung telah dilaksanakan di Laboratorium Mikrobiologi Jurusan Biologi Fakultas Matematika dan Ilmu Pengetahuan Alam. Tujuan Penelitian; (a) Untuk mengamati pertumbuhan jamur tiram putih (Pleurotus ostreatus) pada formulasi media limbah jerami dan tongkol jagung; (b) Untuk mengetahui perbandingan dosis limbah jerami dan tongkol jagung yang dapat memberikan pertumbuhan terbaik terhadap jamur tiram putih. Penelitian ini didesain berdasarkan Rancangan Acak Lengkap (RAL) yang terdiri dari 7 perlakuan dan 3 kali ulangan. Susunan perlakuan merupakan perbandingan antara Serbuk jerami jagung : serbuk Tongkol Jagung yakni P1 (Serbuk Jerami 100%, tanpa Serbuk Tongkol Jagung), P2 (80% + 20%), P3 (60% + 40%), P4 (40% + 60%), P5 (20% + 80%), P6 (Serbuk Tongkol Jagung 100%, tanpa Serbuk jerami), P7 (Serbuk Gergaji 70% + Dedak Padi 20% + Tepung Jagung 10%, tanpa Serbuk Jerami dan Tongkol Jagung). Parameter pengamatan; (a) Media dasar pertumbuhan; (b) Karakteristik mikroskopik hifa; (c) Laju pertumbuhan miselium; (d) Karakteristik makroskopik koloni; (e) Masa inkubasi. Hasil penelitian menunjukkan laju pertumbuhan miselium tercepat pada perlakuan P4 yaitu 103 mm dan terendah pada perlakuan P1 yaitu 75 mm. Jumlah koloni (CFU) tertinggi pada perlakuan P7 yaitu 1,6x1012CFU/g dan terendah pada perlakuan P4 yaitu 0,2x1012CFU/g. Waktu inkubasi paling cepat pada perlakuan P7 yaitu 28 hari dan terendah pada perlakuan P4 yaitu 30 hari.
Utilization and Challenges of Using ICT at SPM Al-Mashduqiah: Perception of English Teachers Ekowijayanto, Mochlis; Sulala, Warda Anis; Rifka, Rifka; Nisa', Ulvatun
International Journal of English Education and Linguistics (IJoEEL) Vol 6, No 2 (2024)
Publisher : Universitas Nurul Jadid

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33650/ijoeel.v6i2.9961

Abstract

The use of technology in English learning is becoming increasingly crucial to achieve optimal learning outcomes. This study aims to explore teachers' perceptions regarding the use and challenges of using Information and Communication Technology (ICT) in English learning at SPM Al-Mashduqiah. Using a qualitative method with a case study type, this study focuses on the perception of English teachers in the school as the subject of the study. Data were obtained through semi-structured interviews, observations, and documentation, which were then analyzed using a descriptive approach to describe and interpret the teacher's experiences and views in detail. The findings reveal that teachers have been utilizing ICT in various aspects of English learning, including the use of learning apps, interactive videos, and online platforms for assignments and evaluations. However, teachers face several challenges, such as limited facilities, lack of technical training, and resistance to changes from traditional teaching methods. Teachers' perceptions of ICT utilization vary; most view ICT as a tool capable of increasing student engagement and learning effectiveness, while others feel burdened by the need to master new technologies in their use in English learning. The study concludes that although the use of ICT in English learning at SPM Al-Mashduqiah has great potential to improve the quality of education, further efforts are needed to address existing challenges, including increased facility support and ongoing training for teachers. These findings are expected to provide valuable insights for policymakers and education practitioners in designing effective strategies for ICT integration, making an English learning more enjoyable and effective.
Memahami Innovative Performance Mempengaruhi Sustainable Growth UKM Tinjauan Literatur Sistematis Trisnawati, Ema; Rifka, Rifka
Jurnal Ekonomi STIEP Vol. 10 No. 1 (2025): JES (Jurnal Ekonomi STIEP)
Publisher : Lembaga Penelitian Dan Pengabdian Masyarakat (LPPM) IBE Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54526/jes.v10i1.421

Abstract

Penelitian ini bertujuan untuk mengkaji pengaruh kinerja inovatif terhadap pertumbuhan berkelanjutan pada Usaha Kecil dan Menengah (UKM). Melalui pendekatan tinjauan literatur sistematis, penelitian ini menganalisis 26 artikel jurnal untuk mengidentifikasi variabel dan dimensi yang berkaitan dengan pengukuran kinerja inovatif dan pertumbuhan berkelanjutan UKM. Hasil analisis menunjukkan beragam metodologi yang diterapkan dalam penelitian terdahulu, dengan dominasi pendekatan kuantitatif seperti Structural Equation Modeling (SEM) dan analisis regresi. Variabel pengukuran kinerja inovatif meliputi aspek inovasi, kapabilitas inovasi teknologi, orientasi inovatif, dan kinerja inovasi, sedangkan pertumbuhan berkelanjutan diukur melalui aspek finansial, teknis, ekonomi, lingkungan, dan sosial. Penelitian ini menghasilkan kerangka kerja komprehensif yang mengintegrasikan perspektif makro (pasar) dan mikro (UKM) dalam mengukur pertumbuhan berkelanjutan UKM. Temuan ini memberikan kontribusi signifikan bagi kalangan akademisi dan praktisi dalam memahami faktor-faktor yang mempengaruhi pertumbuhan berkelanjutan UKM melalui implementasi kinerja inovatif.
Student Self-Directed Learning Strategies In Improving English Speaking Skills In Senior High Schools Rifka, Rifka; Suryanto, Bradhiansyah Tri
International Journal on Advanced Science, Education, and Religion Vol 8 No 3 (2025): IJoASER (International Journal on Advanced Science, Education)
Publisher : Sekolah Tinggi Agama Islam Al-Furqan, Makassar - Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33648/ijoaser.v8i3.1161

Abstract

This research investigates the self-directed learning (SDL) strategies employed by senior high school students to improve their English speaking skills. Using a qualitative narrative inquiry approach, the study explores students’ personal experiences in planning, implementing, and evaluating their independent learning activities. Data were collected through interviews, observations, and document analysis, focusing on how learners manage their study routines, select learning resources, and overcome speaking challenges. The findings reveal that students adopt a combination of cognitive, metacognitive, and socio-affective strategies, such as shadowing native speakers, self-recording, engaging in peer conversations, and utilizing digital applications. Intrinsic motivation, discipline, and self-confidence emerge as crucial internal factors, while access to resources, supportive environments, and technology serve as external enablers. The study concludes that SDL enhances students’ fluency, accuracy, and confidence in speaking English, particularly when strategies are aligned with learners’ preferences and supported by conducive learning conditions.
Student Self-Directed Learning Strategies In Improving English Speaking Skills In Senior High Schools Rifka, Rifka; Suryanto, Bradhiansyah Tri
International Journal on Advanced Science, Education, and Religion Vol 8 No 3 (2025): IJoASER (International Journal on Advanced Science, Education)
Publisher : Sekolah Tinggi Agama Islam Al-Furqan, Makassar - Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33648/ijoaser.v8i3.1161

Abstract

This research investigates the self-directed learning (SDL) strategies employed by senior high school students to improve their English speaking skills. Using a qualitative narrative inquiry approach, the study explores students’ personal experiences in planning, implementing, and evaluating their independent learning activities. Data were collected through interviews, observations, and document analysis, focusing on how learners manage their study routines, select learning resources, and overcome speaking challenges. The findings reveal that students adopt a combination of cognitive, metacognitive, and socio-affective strategies, such as shadowing native speakers, self-recording, engaging in peer conversations, and utilizing digital applications. Intrinsic motivation, discipline, and self-confidence emerge as crucial internal factors, while access to resources, supportive environments, and technology serve as external enablers. The study concludes that SDL enhances students’ fluency, accuracy, and confidence in speaking English, particularly when strategies are aligned with learners’ preferences and supported by conducive learning conditions.
Student Self-Directed Learning Strategies In Improving English Speaking Skills In Senior High Schools Rifka, Rifka; Suryanto, Bradhiansyah Tri
International Journal on Advanced Science, Education, and Religion Vol 8 No 3 (2025): IJoASER (International Journal on Advanced Science, Education)
Publisher : Sekolah Tinggi Agama Islam Al-Furqan, Makassar - Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33648/ijoaser.v8i3.1161

Abstract

This research investigates the self-directed learning (SDL) strategies employed by senior high school students to improve their English speaking skills. Using a qualitative narrative inquiry approach, the study explores students’ personal experiences in planning, implementing, and evaluating their independent learning activities. Data were collected through interviews, observations, and document analysis, focusing on how learners manage their study routines, select learning resources, and overcome speaking challenges. The findings reveal that students adopt a combination of cognitive, metacognitive, and socio-affective strategies, such as shadowing native speakers, self-recording, engaging in peer conversations, and utilizing digital applications. Intrinsic motivation, discipline, and self-confidence emerge as crucial internal factors, while access to resources, supportive environments, and technology serve as external enablers. The study concludes that SDL enhances students’ fluency, accuracy, and confidence in speaking English, particularly when strategies are aligned with learners’ preferences and supported by conducive learning conditions.
The Impact of Using DUOLINGO Application on Students' English Learning Motivation Hasaniyah, Nikmatul; Mumimah, Humairotul; Hasanah, Ulfatun; Qiftiyah, Nor; Rifka, Rifka; Surur, Nikmahus; Syifaturrohman, Syifaturrohman; Ulfiani, Ery Susanti; Suryanto, Bradhiansyah Tri
International Journal of English Education and Linguistics (IJoEEL) Vol 6, No 2 (2024)
Publisher : Universitas Nurul Jadid

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33650/ijoeel.v6i2.9700

Abstract

The application of technology in English language education is increasingly widespread, one of which is through the Duolingo app. This study aims to evaluate the impact of using the Duolingo app on students' motivation in learning English as well as identify the specific factors that contribute to such motivation. The research method used was a mixed approach, combining quantitative and qualitative. Quantitative data was collected through a structured questionnaire with a Likert scale to measure students' motivation and contributing factors. Qualitative data was obtained through focus group discussions (FGDs) to explore students' experiences and perceptions in depth. The results showed that the Duolingo app significantly increased students' motivation in learning English. Findings from the questionnaire indicated that 53.3% of respondents strongly agreed that Duolingo was effective in increasing their motivation, while 46.7% agreed with the statement. The focus group discussion corroborated these findings by emphasising the role of gamification features, such as points and badges, as well as self-paced learning features in making the learning process more enjoyable and improving English confidence and comprehension. The findings are consistent with previous research highlighting the effectiveness of gamification and self-paced learning features and make a novel contribution by exploring the overall impact of different app features. Limitations of this study include the limited sample size and reliance on self-report data, which may affect the generalisability of the results. Future research is recommended to use a larger and more diverse sample and more varied data collection methods, including direct observation and in-depth interviews. Future research could also explore the long-term effects of using Duolingo and the differences in its impact based on students' educational background or initial ability level. It is hoped that these recommendations will provide a deeper understanding of the effectiveness of this app in the broader context of English language education.
Co-Authors Ali Djamhuri Ekowijayanto, Mochlis Ema Trisnawati Eny Yuniati Hasaniyah, Nikmatul I Nengah Suwastika Mumimah, Humairotul Muslimin Muslimin Nisa', Ulvatun Nurul Aisyah Nurvita Nurvita Qiftiyah, Nor Sulala, Warda Anis Surur, Nikmahus Suryanto, Bradhiansyah Tri Syifaturrohman, Syifaturrohman Ulfatun Hasanah Ulfiani, Ery Susanti Umrah Umrah