Judul: Struktur Tegakan Hutan Alam Sebelum dan Sesudah Penebangan di Areal Konsesi Hutan Pulau Siberut, Sumatera Barat
Abstrak: The structure of forest stands have differences between the conditions before and after logging. It is influenced by some factors on the conditions before and after logging. To be able figure out how big the differences between the structure of forest stands before and after logging, the diameter distribution model can be used in the stands like the model of the family distribution. There are four models of the family distribution commonly used that is an Exponential negative, Gamma, Lognormal and Weibull. From the four of distribution model will be selected the best of family distribution models which can describe the difference in the structure of forest stands. The results of the research show the Exponential negative distribution family model was selected as the best model. Based on results test of Chi-square (X2) an Exponential negative distribution family model was able to explain the difference between the structure of forest stands before and after logging.
Keyword: structure of forest stand., model of forest structure, model of distribution family, Chi-square test

Judul: Struktur Tegakan dan Regenerasi Alami Hutan di Pulau Siberut, Sumatera Barat
Abstrak: Stand structure model is important to estimate the dimensions of forest because it can reduce work in the field. The purpose of this study was to determine the general equation stand structure, the status of biodiversity, and the ability of natural regeneration in virgin forest and other former logged over forests. Data was collected from forest stands represent virgin forest and various stand conditions after logging (1 year, 4 years, and 20 years). For each stand condition, plot lines 20 m x 500 m (1 ha) was made, each of the three plots and then identified tree species, measuring tree diameter ≥ 10 cm, measuring the level of regeneration, and mapping of the vertical stand structure. The result of research shows that negative exponential distribution model is the best model to describe stand structure in the virgin forest condition as well as in many former logged forest conditions. Family distribution model can be used for assessment of tree diameter distribution in various diameter class of dipterocarp, non-dipterocarp, and all species. Biodiversity index value is high (2,94 to 3,87 with index of Shannon and 0,027 to 0,122 with indeks of Simpson) that indicates the level of species diversity in the study area is high and the dominance is centered on a couple of species.
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Judul: Infeksi Virus Parainfluenza Pada Anjing
Abstrak: Virus parainfluenza anjing termasuk famili Paramyxoviridae, berbentuk pleomorf dengan ukuran bervariasi (bergaris tengah antara 100-500 nm), berpembungkus peka ether, berisi genom RNA dan secara serologis mempunyai kesamaan dengan virus SV-5 kera; dikenak sebagai salah satu kausa penting dari sindrom "kennel cough". Infeksinya dapat mengenai anjing semua umur yang belum pernah terinfeksi atau mendapatkan vaksinasi mengakibatkan gejala klinis ringan yang terbatas pada traktus respirasi atu infeksi yang secara klinis tidak memperlihatkan gejala nyata. Gejala klinis yang nampak setelah masa inkubasi (1-5 hari) terlewati berupa batuk yang tidak berat selama beberapa hari, berbagai tingkat tonsilitis dan pharyngitis dan kadang-kadang ditemukan kenaikan temperatur rektal antara 1-2 derajat C dari temperatur normal rat-rata. Anjing terinfeksi mengandung virus pada traktus respirasi bagian atas dan bawah serta limfonoduli sampai hari ke 9 setelah infeksi. Penyebaran virus antar anjing terjadi secara aerogen.
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