Palm kernel shells (PKS) treated by commercial sodium bicarbonate (SB) filled recycled high-density polyethylene (rHDPE) were produced using melt compounding. These environmentally friendly composites were prepared using twin-screw extruder by varying untreated and treated filler loading (0, 10 and 30 php). In this study, the tensile properties of untreated rHDPE/PKS and treated rHDPE/PKS-SB were investigated. The composites were subjected to tensile test and the fracture surfaces were observed under scanning electron microscope (SEM). The results showed that SB treatment improved the filler-matrix adhesion and interaction of composites. Meanwhile, the SEM micrographs on the fracture surfaces confirmed that SB treatment which may influence the tensile properties of these composites.
Silver rasbora (Rasbora argyrotaenia) is a freshwater fishery commodity that has high economic value. However, fulfilling the demand for silver rasbora still relies on catches from nature, so cultivation is needed. The problem that occurs in the cultivation process is the Edwardsiella tarda infection which causes Edwardsiellosis disease. The purpose of this study was to determine the bacterial viability of E. tarda from silver rasbora after infection with immersion methods. The Total Plate Count (TPC) from blood, liver and kidney was taken from infected fish after 14 days immersion with bacterial suspension. The results showed that E. tarda infection had occurred in the blood, liver and kidneys as indicated by an increasing the density of bacteria in each organ along with the increasing of the concentration of infected bacteria. The highest density of E. tarda bacteria infected in silver rasbora was in the blood and the least was in the kidneys.
Pemanfaatan potensi komoditas perikanan dan lalu lintas komoditas perikanan baik antar negara maupun antar area di wilayah Indonesia yang semakin meningkat, menjadi peluang akan risiko masuk dan tersebarnya hama dan penyakit ikan. Salah satu patogen yang bersifat akut yang dapat menyebabkan kerugian besar adalah virus. Virus yang sering menyerang ikan air tawar yaitu Tilapia Lake Virus (TiLV). Pemeriksaan virus menggunakan metode PCR konvensional, dimulai dengan nekropsi, fiksasi, ekstrasi, amplifikasi, elektroforesis, dan pembacaan hasil.Tujuan dari penelitian ini adalah untuk mendeteksi adanya infeksi TiLV pada komoditas ikan air tawar menggunakan metode Polymerase Chain Reaction (PCR). Penelitian ini dilaksanakan pada 23 Desember 2019-27 Januari 2020 di Stasiun Karantina Ikan Pengendalian Mutu dan Keamanan Hasil Perikanan Yogyakarta. Sampel yang diperiksa yaitu ikan nila sejumlah 14 sampel. Berdasarkan hasil uji ditemukan 2 sampel positif mengandung RNA TiLV yang terlihat adanya pita (band) pada panjang 250 bp (base pairs) pada benih ikan nila. Kata Kunci: Komoditas ikan nila, Metode PCR, TiLV.
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