Judul: Efektivitas Frekuensi Pemberian Vaksin DNA melalui Pakan terhadap Kelangsungan Hidup Relatif Ikan Mas yang Diinfeksi Koi Herpesvirus
Abstrak: Cultured of common carp is currently constrained by a koi herpesvirus (KHV) disease. KHV disease is highly malignant, infectious, and can kill common carp and koi over 80% of the population. It is therefore necessary to provide a prevention method that are safe and can be mass applied. In this study, it carried out anti-KHV DNA vaccination 1 mL/fish through artificial feed to determine the effective frequency of vaccination that produces a high survival on KHV infected fish. There are five treatments with three replicates, namely treatment A: vaccination once a week, treatment B: two times a week of vaccination, treatment C: vaccination three times a week, positive control: the fish were not vaccinated and challenged with KHV, and negative controls: fish were not vaccinated and injected with phosphate buffer saline solution. Feeding was performed 2 times a day at satiation. The results showed that vaccination three times a week offered 4 the highest relative percent survival (84.6%) and showed the best phagocytic activity compared with other treatments. Hence, vaccination via the feed can effectively increase the survival of fish, and this can be as an alternative method to control KHV infection in carp and koi culture.
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Judul: Efektivitas vaksin DNA anti-KHV pada benih ikan mas Cyprinus carpio melalui metode perendaman dan perlakuan hiperosmotik
Abstrak: Common carp production has decreased since the mass deaths caused by disease of koi herpesvirus (KHV). Therefore, safe technique is needed and can be applied in bulk with cost efficient. The purpose of this research was verified influence of DNA vaccine anti-KHV with dose of 1,3 x 108 cfu / mL was performed through immersion in different duration after hyperosmotic treatment for 2 minutes treatment to produced the resistence common carp. There were six treatments with three replications, A: vaccination for 60 minutes immersion, B: 90 minutes, C: 120 minutes, positive control: fish were not vaccinated and infected with KHV, negative control: fish not vaccinated and were not infected with KHV, control bacteria: fishes that soaked with bacteria did not containing vaccine. The results showed that vaccination for 60 minutes giving highest relative survival (93.55%). Thus, vaccination by immersion and hyperosmotic treatment effectively improve the survival and relative percent survival of fish, and this method can be an alternative in the early control of KHV infection in common carp and koi.
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Judul: Pembentukan tanah berbahan induk andesit-basaltik dan satuan-satuan tanah menurut sistem soil taxonomy pada suatu toposekuens di daerah Ujung Berung Bandung
Abstrak: Tujuan penelitian adalah untuk melihat satuan-satuan tanah pada toposekuens lereng G.Manglayang, Ujungberung, Bandung menurut sistem Soil Taxonomy dalam hubungannya dengan pembentukan dan perkembangan tanah yang didasarkan pada sifat fisik, kimia, dan kandungan mineralnya sebagai hasil dari proses penambahan, pengurangan, pemindahan, dan pengubahan dalam sistem di dalam profil tanah. Pada daerah perbukitan, faktor topografi sangat berperanan dalam proses pembentukan dan perkembangan tanah. Faktor topografi mempengaruhi pergerakan air baik secara vertikal maupun horisontal, sehingga berpengaruh terhadap tingkat kelembaban, proses pelapukan, pencucian dan pemiskinan serta proses erosi dan deposisi. Proses-proses ini akan menentukan sifat-sifat tanah secara fisik, kimia maupun kandungan mineralnya. Topografi semakin cembung menunjukkan tingkatan umur pembentukan tanah yang lebih lanjut dan cenderung membentuk tanah-tanah bersifat oksik dengan kandungan mineral liat tipe 1:1, yaitu Kaolinit, sehingga tingkat kesuburannya lebih rendah. Sedangkan pada topografi cekung cenderung terbentuk tanah muda, yaitu tanah belum berkembang dan mulai berkembang dengan kandungan mineral amorf. Pada topografi rektilinier cenderung terbentuk tanah berkembang dengan pembentukan horison Argilik.
Keyword: Sifat fisik, Sifat kimia