Judul: Korelasi model arsitektur pohon dengan laju aliran batang, curahan tajuk, infiltrasi, aliran permukaan dan erosi (suatu studi tentang peranan vegetasi dalam konservasi tanah dan air pada sub-DAS Cianjur Cisokan Citarum Tengah)
Abstrak: Every tree species which grows at an watershed has a certain architectural model that is why it has also different capacity in transforming rainfall directly as stemflow, througfall an interception. The research was conducted with purpose of (1) identifying architectural model of thirty trees, their IVI at each zone and water conservation and (2) easuring litter production of thirty tree species growing at the upstream of Cianjur watershed in the GPNP.
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Judul: Aliran Batang dan Curahan Tajuk pada Beberapa Model Arsitektur Pohon.
Abstrak: Salah satu tujuan pembangunan hutan kota untuk area yang curam adalah mencegah terjadinya erosi. Erosi dapat disebabkan oleh besarnya aliran batang dan curahan tajuk. Perbedaan aliran batang dan curahan tajuk diduga disebabkan perbedaan model arsitektur pohonnya. Penelitian bertujuan mengkaji pengaruh beberapa model arsitektur pohon terhadap besaran aliran batang dan curahan tajuk. Penelitian dilakukan di Kampus IPB Darmaga pada bulan April - Mei 2020. Pengumpulan data dilakukan dengan mengukur aliran batang dan curahan tajuk pada lima model arsitektur berbeda yaitu Massart, Aubreville, Koriba, Rauh, dan Troll. Hasil penelitian menunjukkan bahwa model arsitektur pohon memengaruhi besaran aliran batang dan curahan tajuk. Besaran aliran batang (Y) dipengaruhi juga oleh curah hujan (X1) dan kerapatan tajuk (X2) dengan persamaan Y = 0.05665 + 0.0241X1 – 0.0291X2, R2 = 60.7%. Besaran curahan tajuk (Y) juga dipengaruhi oleh curah hujan (X1) dan kerapatan tajuk (X2) dengan persamaan Y = -0.05 + 0.880X1 – 0.413X2, R2 = 77.8%. Model arsitektur pohon yang mempunyai potensi digunakan untuk kepentingan konservasi tanah dan air yaitu Massart dengan jenis bisbul (Diospyros discolor Willd.).
Keyword: aliran batang, curah hujan, curahan tajuk, kerapatan tajuk, model arsitektur pohon

Judul: Pengujian Virus Newcastle Disease Gen VII Isolat Lapang Sebagai Virus Standar Pada Uji Tantang Vaksin
Abstrak: This study was conducted to determine the standard of Newcastle disease virus Gene VII field isolate as a virus challenge to vaccine test. A virus suspension that has previously been tested by HA test then titrated with EID50 using 30 Specific Pathogen Free (SPF) of 10 day old chicken embryonated eggs. In addition, chicken lethal dose50 (CLD50) test were used to determine the virus titer that could cause 50% death of the chicken population. The CLD50 test was used 25 day-old-chickens (DOC) divided into 5 groups. The virus was diluted from 10-1 to 10-8. The 104 to 10-8 dilution of NDV was infected to every group of chicken via eyedrop and intranasal with 0.1 ml/chicken dosage. Haemagglutination test showed that the allantoic fluid were contain high titers of NDV is 512 HAU. The infective NDV that had been titrated by EID50 test showed the virus titers is 109 EID50/0.1 ml or 1010 EID50/ml and the virus titers of CLD50 test e.i 106.48 CLD50/0.1 ml or 107.48 CLD50/ml. These results can be concluded that the NDV Gene VII field isolates were most appropriate to be used as a standard virus to vaccine test
Keyword: Newcastle Disease Virus Gene VII, HA tes, EID50 test, CLD50 test