Judul: Perubahan Penutupan Lahan dan Dampaknya Terhadap Stok Karbon Permukaan pada Daerah Aliran Sungai Ciliwung
Abstrak: Changes in land cover will affect the ecological condition of the watershed. Currently, the conversion of natural forests into agricultural land has been one of the main factors of deforestation in Indonesia. The land covers dynamic could give impact to erosion, increase run off and sedimentation, loss of biodiversity, change of micro climate, the release of Carbon and Green House Gas (GHG)into the air, etc. This problem has been going on in Ciliwung watershed. Forest area, as sources of Carbon deposits and Carbon absorbents, has limited area along with increasing extents of build up areas. Therefore, it’s estimated the ecological changes will be extended, then will affect the amount of Carbon stocks in Ciliwung watershed. The objectives of research are: to determine land cover changes during the last twenty years, to analyze actual Carbon stocks in Ciliwung watershed, and to analyze the effect of land cover changes in over twenty years of greenhouse gases, especially CO2. This research used three samples plot on each of the existing land cover. Biomass approach was used in order to estimate Carbon stock. Changes in Carbon stocks were calculated by using interpolation based on the actual Carbon stocks in 2011. The research results showed that build up areas was increased 153,36% during twenty years. The highest potencial Carbon stocks was found in pines forests, which is 144,99 tons/ha. Over the last twenty years, Carbon stocks in Ciliwung watershed is increased 188.676,32 tons carbon or 692.442,08 tons CO2e.
Keyword: 

Judul: Land Cover Change and River Discharge in the Upper Ciliwung Watershed
Abstrak: Perubahan tutupan lahan akan terus berlangsung seiring meningkatnya jumlah dan aktivitas penduduk untuk memenuhi kebutuhan akan lahan. Pada DAS Ciliwung Hulu terjadi perubahan tutupan lahan yang intensif. Perubahan tutupan lahan berpengaruh terhadap kondisi hidrologi pada DAS Ciliwung Hulu, salah satunya adalah terhadap debit aliran sungai. Tujuan dari penelitian ini adalah mengidentifikasi perubahan tutupan lahan dan mengevaluasi hubungan perubahan tutupan lahan dengan debit aliran DAS Ciliwung Hulu. Perubahan tutupan lahan dianalisis luasannya dengan metode overlay, koefisien aliran permukaan dihitung dengan menggunakan perbandingan direct run-off dengan curah hujan, dan analisis data dilakukan dengan metode regresi berganda untuk melihat hubungan perubahan tutupan lahan dengan debit aliran sungai. Hasil penelitian menunjukkan, tutupan lahan yang paling banyak mengalami perubahan di DAS Ciliwung hulu pada periode 2009 dan 2018 adalah pertanian lahan kering menjadi permukiman, yaitu seluas 1818.14 Ha. Sementara itu, nilai koefisien aliran permukaan didapatkan sebesar 0.26. Hubungan tutupan lahan secara bersama-sama terhadap debit aliran termasuk kategori cukup signifikan dengan nilai R2 sebesar 0.542. Berdasarkan hasil analisis regresi, model persamaan yang didapatkan adalah Y = 7256 – 4.03 H – 0.27 Pm + 10.9 Pk + 2.29 Pt – 13.5 Pc + 5.79 Sb.
Keyword: Land cover change, river discharge, regression analysis, upper  Ciliwung watershed

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