Judul: Pendugaan Potensi Biomassa Tegakan di Areal Rehabilitasi Hutan Pendidikan Gunung Walat Menggunakan Metode Tree Sampling
Abstrak: Tree sampling is an alternative method to plot sampling for estimating stand potency. Such method, however, has not been commonly used yet for estimating stand biomass of rehabilitated forest areas, particularly in Gunung Walat University Forest (GWUF). The objective of this study was to compare the precision of tree sampling and plot sampling methods in estimating stand biomass in GWUF. The tree sampling method was implemented by measuring only 3, 4, 5, 6, 7, and 8 sample trees nearby the plot centers. The number of sample units was 72, which were located in the field by using a stratified systematic sampling with random start. For each sample unit, tree measurements were conducted to record diameter, height, and distance between the furthest tree and center plot. The results showed that the estimation of stand biomass using 3, 4, 5, and 6 sample trees provided similar precision to that of plot sampling. This means that tree sampling can be used an alternative method for estimating stand biomass in GWUF.
Keyword: Bogor Agricultural University (IPB), tree sampling, stratified sampling, plot sampling, sample unit, biomass

Judul: Perbandingan Ketelitian Metode Pendugaan Biomassa Pinus dan Agathis di Areal Rehabilitasi Hutan Pendidikan Gunung Walat.
Abstrak: An alternative method for estimating biomass is converting tree volume into aboveground tree biomass by using wood density and biomass expansion factor (BEF). This method is commonly used in estimating a tree biomass, especially when allometric biomass models are not available. The objective of this study was to analyze the precision of biomass estimation using the conversion of tree volume for estimating tree-level and stand-level biomass in the rehabilitation area of Gunung Walat University Forest (HPGW). Tree biomass was calculated using three methods, i.e. allometric models, tree volume conversion using a general wood density, and tree volume conversion using a specific wood density. The results showed that generally the volume conversion method using a spescific wood density produced relatively similar biomass estimates to the allometric method. Thus, the volume conversion method using a specific wood density can be used as an alternative method for estimating stand biomass, especially in the rehabilitation area of HPGW.
Keyword: pine, agathis, biomass, volume conversion, precision

Judul: Enteric Collibacillosis Pada Anak Babi Baru Lahir: Patogenesa dan Perubahan-Perubahan Patologisnya
Abstrak: Diare disebabkan oleh infeksi bakteri Escherichia coli pada anak-anak babi baru lahir yang peka terhadap en terotoksin produk bakteri tersebut. Dikenal sebagai colibacillosis. Patogenesa dari colibacillosis anak babi baru lahir adalah (1) infeksi oleh E. coli patogen, (2) proliferasi E. coli di lumen usus halus, (3) produksi dan pelepasan enterotoksin, dan (4) aktifitas toksin pada usus halus. Dalam proses proliferasi, adanya antigen pili K88 sangat penting karena memungkinkan bakteri perlekatan dengan epitel mucosa usus halus. mengadakan Setelah ko lonisasi dan proliferasi segera toksin dilepaskan. Akti- fitas toksin menginduksi sekresi yang berlebihan dari u- sus sehingga banyak cairan yang dikeluarkan ke lumen usus. Hal ini mengakibatkan banyak cairan dan elektrolit hilang sehingga timbul diare, dehidrasi dan asidosis yang sering menyebabkan kematian. Perubahan-perubahan patologis yang umum adalah dis tensi usus halus, dilatasi lambung dan infark pada kurva- tura mayor. Perubahan-perubahan histologis yang terjadi adalah enteritis hemorrhagica acuta, oedem dan kongesti pembuluh darah di lamina propria, akumulassi leukosit inti polimorf, sel monosit, dan inti sel mengalami piknosis Thrombus pada vena dan degenerasi serta desquamasi sel epitel usus….
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