No abstract

Anthropogenic activities that tend to be exploitative in the mangrove ecosystem of Belawan are thought to have an impact on the biota associated with the ecosystem. One of the impacts is thought to be implied by mantis shrimp Cloridopsis scorpio (Latreile, 1828). The reproductive biology of the shrimp is the main object that needs to be studied in relation to the impacts. This study aims to determine the distribution of gonad maturity stage, gonad somatic index, and the length of the first mature of C. scorpio in the Mangrove Ecosystem of Belawan, North Sumatera. The research was conducted on March to May 2019 with a biweekly sampling period. The purposive random sampling was applied to choose three sampling stations in the research location. Mantis shrimp samples were caught using shrimp trawl. The result showed that the gonad maturity stage of males and females were dominated by Stage I. The gonad somatic index (GSI) range of males were 7.00-10.93 and female were 7.40-11.15. The GSI value of C. scorpio is closely related to its gonad maturity development. The length of the first mature (L50) of males were 205.50±10.65 mmBL and females were 186.0±10.48 mmBL.Keywords: Cloridopsis scorpio, Gonad maturity stage, Gonad somatic indeks, Length of the first mature ABSTRAKAktivitas antropogenik yang cenderung eksploitatif di kawasan ekosistem mangrove Belawan diduga telah berdampak terhadap biota-biota yang berasosiasi dengan ekosistem tersebut. Salah satu dampaknya dialami oleh udang mantis Cloridopsis scorpio (Latreile, 1828). Aspek reproduksi C. scorpio menjadi salah satu objek yang perlu dikaji berkaitan dengan dampak tersebut. Penelitian ini bertujuan untuk menganalisis sebaran tingkat kematangan gonad (TKG), indeks kematangan gonad (IKG), dan ukuran pertama kali matang gonad (L50) dari C. scorpio di ekosistem mangrove Belawan, Sumatera Utara. Penelitian dilakukan pada bulan Maret sampai Mei 2019 dengan periode pengambilan sampel dua mingguan. Metode purposive random sampling digunakan untuk menentukan tiga stasiun pengambilan sampel di lokasi penelitian. Sampel C. scorpio ditangkap menggunakan pukat udang. Hasil penelitian menunjukkan distribusi TKG C. scorpio jantan dan betina didominasi oleh TKG I. Nilai IKG C. scorpio jantan berkisar antara 7,00-10,93 dan C. scorpio betina berkisar antara 7,40-11,15. Nilai IKG C. scorpio berkaitan dengan tahap perkembangan gonadnya. C. scorpio jantan mengalami pertama kali matang gonad (L50) pada ukuran 205,50±10,65 mmBL dan C. scorpio betina pada ukuran 186,00±10,48 mmBL.Kata kunci: Cloridopsis scorpio, TKG, IKG, Ukuran pertama kali matang gonad

This aims of dedication community to uplifting entrepreneurial activities in order and increas the economy of the people in Pelayangan sub-district, Jambi city. The service location is the closest location to the tourist area “Gentala Arasy” bridge which is the icon of Jambi city. Through this service, it is hoped that the community at the service location can develop this activity to increase the collection of souvenirs sold at that location. The easy process of making and the availability of abundant leaves is one of the criteria for this dedication. This activity is carried out in two stages, namely counseling and practice. The extension stage is carried out by presenting participants about the manufacturing process and the equipment used. Practical stage is working directly into a product. The result is some of key chain products that are ready to be used as souvenirs. This activity provides knowledge to the community to generate interest in entrepreneurship. All stages of the event went well and was attended by all participants. This service activity will continue to be carried out in order to improve the community's economy and to support the vision of Jambi University as a World Class & Entrepreneurship University.

Penelitian ini bertujuan untuk meningkatkan kemampuan berpikir kritis mahasiswa pada matakuliah Morfologi Tumbuhan dengan penerapan Blended Learning berbasis Project Based Learning. Penelitian ini merupakan penelitian tindakan kelas, subjek penelitian ini adalah mahasiswa yang mengambil Mata Kuliah tersebut. Pembelajaran berlangsung secara Synchronous dan Asynchronus dengan menggunakan beberapa media seperti WhatApp, Zoom Meeting, Materi dan Video pembelajaran yang dapat diakses di LMS UNJA. Pembelajaran Synchronous dilakukan secara Virtual dan Live sementara Asynchronous dilakukan secara Collaborative dan Mandiri.  Dari penelitian ini didapatkan data Kemampuan berpikir kritis mahasiswa meningkat dari siklus I yang hanya 64% menjadi 91% pada siklus II. Peningkatan yang terjadi sangat signifikan yakni sebanyak 28%. Sedangkan persentase siswa yang melakukan tiap aspek kegiatan pembelajaran pada pertemuan I siklus I awalnya hanya 66% meningkat menjadi 72% pada pertemuan II Siklus I. Kemudian dilakukan observasi lagi pada pertemuan I siklus II dan diperoleh persentase aktivitas mahasiswa dalam berpikir kritis sebesar 75% kemudian meningkat menjadi 87%. Peningkatan ini sudah mencapai kriteria karena minimum keterlaksanaan aktivitas pembelajaran yang baik adalah 85% dari jumlah seluruh siswa terlibat aktif dalam kegiatan pembelajaran. Berdasarkan hasil pengukuran kemampuan berpikir kritis mahasiswa dan observasi aktivitas mahasiswa maka dapat disimpulkan bahwa penggunaan model blended learning dapat meningkatkan kemampuan berpikir kritis mahasiswa pada Mata Kuliah Morfologi Tumbuhan Kelas R001 Semester 2 Program Studi Biologi Universitas Jambi.

The nanomagnetite/HA-Chitosan adsorbent has been successfully synthesized by the co-precipitation method. HA was synthesized from the peat soils of Geragai village, Tanjung Jabung Timur, Jambi province and chitosan isolated from marine animal shell waste around the city of Jambi. The results of FT-IR analysis showed that nanomagnetite/AH-chitosan has a spectra which was combination of the characteristic spectra of magnetite, HA and chitosan. Morphological analysis using SEM showed that nanomagnetite/AH-chitosan was in the form of fractal agglomerates. TEM image of magnetite/AH-chitosan showed that magnetite/AH-chitosan has nano scale magnetite core particles with a size between 4-22 nm. Crystallinity analysis showed that magnetite/AH-chitosan has 2θ characteristics of magnetite i.e., 30.1°, 35.4°, 43.1°, 57.0°, 62.68° and 74.5°. The magnetic saturation strength (Ms) decreased from 80.23 (magnetite) to 30.63 (magnetite/AH-chitosan) due to the coating of AH-chitosan on magnetite which was still effectively attracted by the external magnet with 96% effectiveness of adsorption of 25 mL Methylene Blue 10 mg/L.