Judul: Analisis Tingkat Kecenderungan Pembentukan Scale pada Formula Surfaktan Berbasis Metil Ester Sulfonat untuk Aplikasi Enhanced Oil Recovery
Abstrak: Surfactant of Methyl Ester Sulfonate (MES) is used to increase the yield of oil of the old well. Decreasing of interfacial tension values is obtained after the addition of NaCl alkali concentration of 0.5 % of water injection, after that MES surfactant was added at 0.3%, and were added by Na2CO3 alkali concentration of 0.1%, 0.2%, and 0.3%. The objective of the study was to know scale formation rate of formulation solution of MES surfactant. Scale is deposition occurred by reaction of compounds in the solution. Carbonate scale formation rate was observed from SI (stability index) and PTB (pounds per thousand barrels) which showed a negative value, so the surfactant formula solution was not saturated with CaCO3. Ranges of SI value were -2.88 mg/L to -0.39 mg/L and range of PTB value were 99.27 mol/l to -0.05 mol/l. The calculation result of solubility showed that CaSO4 and BaSO4 were dissolved properly, so that precipitation did not occur. Ranges of CaSO4 solubility were 403.34 meq/l to 34,400.99 meq/l and range of BaSO4 solubility were 0.54 meq/l to 367.62 meq/l.
Keyword: solubility., SI and PTB, scale, alkali concentration, Surfactant of Methyl Ester Sulfonate

Judul: Pengaruh penambahan garam anorganik, pelarut alkohol, dan alkali terhadap formula " Surfaktan MES - Air Formasi - Minyak" (studi kasus Lapangan Sandstone)
Abstrak: The application of methyl ester sulfonate (MES) surfactant for enhance oil recovery (EOR) was due to its ability to reduce interfacial tension in crude oil-water system that reaches 10-3 dyne/cm. Performance of methyl ester sulfonate (MES) surfactant can be identified with the spinning drop IFT method and phase behavior method. The objectives of this research were to determine of MES surfactant performance with addition of inorganic salt, alcohol, and alkaly in different conditions. The dispersing media used in this research is the formation water and demineralized water. The spinning drop IFT method was conducted using spinning drop tensiometer TX500C tested in 40, 50 and 60 oC. The researched showed that reduction of IFT value was affected by surfactant, inorganic salt, solvent alcohol, and alkali in the formation water and demineralized water dispersion medium. The phase behavior method was conducted using test tube method performance at 50 oC. The best result of phase behavior methode was found in formation water dispersion medium with the 0,3% of methyl esteer sulfonat (MES) addition.
Keyword: Bogor Agricultural University (IPB), phase behavior, methyl ester sulfonate (MES), interfacial tension (IFT), inorganic salt, alcohol, Alkali

Judul: Macam-macam avian adenovirus pada ayam dan penyakit inclusion body hepatitis
Abstrak: Avian Adenovirus pada ayam dibagi menjadi beberapa kelompok serotype. Tipton adalah salah satu serotype dari Avian Adenovirus dan menyebabkan penyakit Inclusion Body Hepatitis (IBH) pada ayam. Inclusion Body Hepatitis pertama kali ditemukan pada tahun 1963 di Amerika Serikat dan di Indonesia untuk pertama kalinya ditemukan di BPT Ciawi pada tahun 1978. Penyakit ini pada umumnya menyerang ayam pada umur muda dan kebanyakan terjadi pada ayam broiler. Masa inkubasi singkat, dapat menular secara vertikal maupun horizontal dan ditandai dengan adanya perubahan patologik hati serta adanya inclusion body di dalam inti sel hati.
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