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: The giving of sinbiotic with the different frequency in feed of white shrimp Litopenaeus vannamei for prevention of IMNV (Infectious Myonecrosis Virus).
Abstrak: Udang vaname (Litopenaeus vannamei) merupakan salah satu komoditas ekspor unggulan di bidang perikanan. Namun penyakit bakterial dan viral sering menjadi kendala dalam budidaya udang vaname. Salah satu penyakit viral yang saat ini banyak menyerang udang vaname adalah IMNV (Infectious Myonecrosis Virus). Penelitian ini dilakukan untuk menguji efektivitas pemberian pakan sinbiotik dengan frekuensi berbeda terhadap sintasan, pertumbuhan, dan respons imun udang vaname yang diinfeksi IMNV. Udang yang digunakan memiliki bobot 0,493±0,035 gram/ekor, dipelihara sebanyak 15 ekor dalam akuarium berukuran 60x35x30 cm yang diisi air laut sebanyak 30 liter. Penelitian dilakukan dengan 5 perlakuan yaitu A (tanpa pemberian sinbiotik dan diinfeksi IMNV), B (tanpa pemberian sinbiotik dan tanpa infeksi IMNV), C (pemberian sinbiotik setiap hari dan diinfeksi IMNV), D (pemberian sinbiotik dua kali seminggu dan diinfeksi IMNV), dan E (pemberian sinbiotik satu kali seminggu dan diinfeksi IMNV). Hasil penelitian menunjukkan bahwa pemberian sinbiotik dengan frekuensi setiap hari memberikan pengaruh yang lebih baik dibanding perlakuan lainnya. Udang yang dipelihara dengan pemberian pakan sinbiotik setiap hari dan diinfeksi IMNV memiliki sintasan yang tinggi (80%) serta respons imun yang lebih baik.
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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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