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All Journal DWIJA CENDEKIA: Jurnal Riset Pedagogik Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture PENA AKUATIKA : JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Wulan, Dyah Retno
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Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Mathematics Social Sciences Other

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The Potential of Biostimulants to Enhance the Growth of Kappaphycus alvarezii (Rhodophyta) Propagules Fadilah, Siti; Septiana, Shinta; sumiarsih, Sumiarsih; Wulan, Dyah Retno; khaerudin, Khaerudin; Prama, Ega Aditya; Putri, Lala Priyantika Adinda
Sains Akuakultur Tropis : Indonesian Journal of Tropical Aquaculture Vol 9, No 1 (2025): SAT edisi Maret
Publisher : Departemen Akuakultur FPIK UNDIP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/sat.v9i1.25348

Abstract

Kappaphycus alvarezii is a globally significant tropical red seaweed renowned for its carrageenan content. While tissue culture is a valuable technique for enhancing seedling quality and stress resilience in vegetative propagation, it is time-consuming and costly. Biostimulants have demonstrated the potential to enhance plant growth. This study aimed to evaluate the potential of biostimulants in enhancing the growth of K. alvarezii propagules. Three different biostimulant products were tested: biostimulant A (amino acid-based), biostimulant B (bacteria-based), and biostimulant C (seaweed extract-based). Each biostimulant was applied at two different concentrations and compared to a negative control and a positive control. Artificial seawater enriched with PES and supplemented with biostimulants according to the treatment was used as the growth medium. Growth of K. alvarezii propagules was monitored weekly, with the primary parameters being propagule weight and specific growth rate. Growth medium quality was assessed by in situ pH measurements and ex situ nitrate and phosphate analyses. Fermented biostimulants negatively impacted growth by reducing the pH of the culture medium, while biostimulant B (photosynthetic bacteria) maintained a near-neutral pH and showed the most promising results, with treatment B2 displaying stable growth and treatment B1 achieving the highest specific growth rate at week 6. Though treatments A1 and A2 showed higher nitrate and phosphate concentrations, these did not correlate with improved growth, likely due to the low pH. While these findings suggest the potential of photosynthetic bacteria for K. alvarezii growth, further research is necessary to fully understand the underlying mechanisms and to develop strategies to overcome the limitations associated with the acidic nature of fermented biostimulants.
Pengaruh Salinitas Berbeda Terhadap Daya Tetas Telur Udang Vaname (Litopenaeus vannamei) Hidayah, Elmi; Anggoro, Agung Doni; Wulan, Dyah Retno; Satriyanto, Budi; Rinjani, Gudhia Dunnya
Pena Akuatika : Jurnal Ilmiah Perikanan dan Kelautan Vol. 24 No. 1 (2025): PENA AKUATIKA JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Fakultas Perikanan Universitas Pekalongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31941/penaakuatika.v24i1.4975

Abstract

Salinitas  sangat berpengaruh pada budi daya perikanan air laut maupun air payau. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh kisaran kadar garam (salinitas) yang baik pada daya tetas telur udang vaname (Litopenaeus vannamei), sebagai acuan nantinya pada proses pembenihan udang vaname di fase peneluran. Metode pengambilan data ini menggunakan percobaan Rancangan Acak Lengkap (RAL) yang terdiri dari 4 perlakuan yaitu salinitas 28 ppt, salinitas 32 ppt, salinitas 34 ppt dan 3 kali ulangan dengan jumlah telur per pengulangan 200 butir. Alur proses penelitian ini diawali dengan persiapan peralatan (Bak / kolam, seser, refraktometer, dll) yang dibutuhkan, tahap selanjutnya yaitu penyediaan telur udang vaname sebagai bahan penelitian, dan tahap terakhir yaitu melakukan pengamatan penelitian. Hasil penelitian menunjukan salitinas 32 ppt mendapatkan hasil terbaik dimana pembelahan sel sangat optimal dan waktu yang diperlukan lebih singkat yaitu 8 jam 43 menit dengan nilai rata-rata HR 84-91% tidak terdapat naupli yang abnormalitas dan naupli berenang aktif.
An English Teacher's Autobiography of Using Digital Multimodal Composing in Teaching Writing to Vocational Students Wulan, Dyah Retno; Drajati, Nur Arifah; Supriyadi, Slamet
DWIJA CENDEKIA: Jurnal Riset Pedagogik Vol 6, No 3 (2022): DWIJA CENDEKIA: Jurnal Riset Pedagogik
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.826 KB) | DOI: 10.20961/jdc.v6i3.68127

Abstract

This study is an autobiography of the author's experience as an English teacher teaching 12th graders digital multimodal composing (DMC). I have been teaching vocational high school students for seventeen years in one of Indonesia's vocational high schools. I am still looking for the best way to develop the writing skills of vocational high school students. I want to alter their perceptions of writing. It is essential to create a fun and meaningful writing process both inside and outside the classroom. Students born in the twenty-first century, the digital generation, and modern students. DMC as the textual practice entails using digital tools to generate text by combining various semiotic modes. Each mode is meaningful and serves a purpose. As a teacher, I can create any digital mode based on my students' needs and knowledge. This study used the narrative inquiry method to explore and reflect on the story of the teacher.
Co-Authors Anggoro, Agung Doni Budi Satriyanto Hidayah, Elmi Khaerudin Khaerudin Khairani, Misbahul Nur Arifah Drajati Nurul Huda Prama, Ega Aditya Putri, Lala Priyantika Adinda Razak, Faisal Rinjani, Gudhia Dunnya Septiana, Shinta siti fadilah Slamet Supriyadi Sumiarsih Sumiarsih, Sumiarsih