Judul: Pemberian Meniran Phyllanthus niruri Untuk Pencegahan Infeksi IMNV (Infectious Myonecrosis Virus) pada Udang Vaname Litopenaeus vannamei
Abstrak: IMNV (Myonecrosis Infectious Virus) is a virus that attacks shrimp vaname in recent years. Currently, treatment and drug has not been obtained to control the virus IMNV. This research done to determine the effect immunostimulan meniran extract 20 mg / kg in infected shrimp IMNV. IMNV infection in shrimp feeding trials carried out through a IMNV infected shrimp meat for 3 days by 50% from biomass. Based on the results obtained, IMNV infection gives a significantly different effect on survival rate. In the infected shrimp IMNV without giving meniran survival rate of 66.67%, while the survival rate of shrimp that were infected with the provision meniran IMNV of 86.67%. For the shrimp that are not infected IMNV, the survival rate of 93.33%. IMNV clinical signs in general is white necrotic areas in striated (skeletal) muscles. In the treatment of clinical signs seen meniran on day 6 after infection. While on treatment without being infected IMNV meniran extracts, clinical signs first appeared on day 3 after infection.
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Judul: Pemberian Meniran Phyllanthus niruri dengan Dosis Berbeda Untuk Pencegahan Infeksi IMNV (Infectious Myonecrosis Virus) pada Udang Vaname Litopenaeus vannamei
Abstrak: IMNV (Infectious Myonecrosis Virus) dianggap sebagai penyakit utama pada industri udang vaname. Tujuan penelitian ini adalah untuk menguji efektivitas berbagai dosis meniran pada tingkat kelangsungan hidup optimum udang vaname yang diinfeksi buatan IMNV. Penelitian dilakukan dengan menggunakan rancangan acak lengkap (RAL) dengan 5 perlakuan dan 4 ulangan termasuk untuk histopatologi. Perlakuan A (kontrol negatif), B (kontrol positif), C (10 mg /kg pakan udang), D (20 mg/kg pakan udang), dan E (30 mg/kg pakan udang). Perlakuan C, D, dan E diberi pakan mengandung meniran selama 7 hari sesuai dosis yang ditentukan. Kemudian semua perlakuan kecuali perlakuan A diinfeksi, dengan memberikan daging udang yang terinfeksi selama 3 hari sebanyak 15% (sesuai FR). Nilai tingkat kelangsungan hidup yang diperolah setelah pengamatan 29 hari adalah 93,33%, 43,33%, 86,68%, 90,00% dan 83,33% untuk perlakuan A, B, C, D, dan E. Penelitian ini menunjukkan bahwa dosis optimum adalah 20 mg/kg pakan dengan tingkat kelangsungan hidup 90% udang terinfeksi IMNV. Berdasarkan pemeriksaan histopatologi infeksi menyebabkan perubahan pada jaringan otot, badan inklusi terbentuk di hepatopankreas, nekrosis, dan hipertrofi sel.
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Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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