Judul: Evaluasi Kualitas Pertumbuhan dan Karakteristik Kayu Jati (Tectona grandis L. f.) Unggul Nusantara Umur 4 Tahun
Abstrak: INTRODUCTION. The lack of better quality of wood supply recently has resulted in the barrier of wood industry development in Indonesia. To overcome the above problem many community forests had been establishing by people using selected wood species. One of them is Jati (Tectona grandis) Unggul Nusantara (JUN) plantation belongs to Koperasi Perumahan Wanabakti Nusantara (KPWN) with teak as the main species. These stands were planted using tree spacing of 3 m by 3 m for the rotation of 5 years. To ensure these woods qualities were similar to those of the conventional teak, growth quality and wood properties have to be studied well. The aim of the study was to evaluate growth quality and wood characteristics of 4 year-old JUN by measuring the diameter and height of the trees and by studying wood physic properties and fiber morphology. MATERIALS AND METHOD. The main material used was increment core of 4 year-old of JUN extracted from the stem from the nine selected trees representing the diameter of the stands (small, medium and big) at dbh level using increment borer (ø 5 mm). From each sample tree, 2 pieces of increment core were extracted oppositely: one for wood physical measurement (moisture content at green condition/green MC, wood density and specific gravity/SG); and the other for fiber morphology measurement (fiber length and cell wall thickness). Both of them were measured radially (from pith to the bark). All measurements were carried out using procedural standard of Faculty of Forestry IPB. Demarcation between juvenile- and mature wood portions was evaluated using fiber length and wood density from pith to the bark. Effect of stem diameter and growth ring number was evaluated using t-student at the 95% confidence interval. Data processing was conducted with SPSS 13. RESULT AND DISCUSSIONS. It showed that growth quality of JUN was varied. Average value of diameter and height was 13.45 cm and 6.92 m, respectively. Growth rate of diameter and height was fast. They are around 3.36 cm and 1.73 m per year, respectively. It also showed that green MC, density, SG, fiber length and cell wall thickness of each group were varied. Average value of green MC was 112.27% (small tree), 127.53% (medium) and 146.35% (big); wood density was 0.99 g/cm3 (small), 1.02 g/cm3 (medium) and 1.09 g/cm3 (big); SG was 0.47 (small), 0.45 (medium) and 0.45 (big); fiber length was 741.15 μm (small), 845.52 μm (medium) and 833.30 μm (big), while wall thickness was 3.06 μm (small), 3.20 μm (medium) and 3.17 μm (big). Statistical analysis showed that green MC and wood density are influenced by diameter, while SG, fiber length and cell wall thickness are not. The bigger the diameter, the greater the green MC and the wood density. Based on its SG, the wood of JUN was classified into Strength Class of III. The result also showed that growth ring has no effect on the all parameters studied, except in case of SG on medium tree group and fiber length on small tree group. Generally, SG and fiber length tended to increase from pith to the bark.
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Judul: Tree Growth Quality Evaluation and the Natural Durability of Muna Superior Teakwood
Abstrak: Jati Muna merupakan salah satu jenis kayu yang banyak digunakan sebagai bahan baku mebel bermutu tinggi. Ketersediaan kayu jati Muna semakin berkurang dari tahun ke tahun akibat daur atau umur tebang yang terlalu lama (±50 tahun). Sejak satu dekade terakhir telah dikembangkan jati Muna cepat tumbuh yang lebih dikenal sebagai kayu jati inti karena dipapar dengan sinar gamma. Beberapa sifat dan karakteristik kayu jati inti sudah diteliti, namun mutu pertumbuhan pohon dan keawetan alami kayunya belum. Penelitian ini bertujuan mengevaluasi mutu pertumbuhan pohon jati inti umur 8 tahun dan mengkaji hubungan antara laju pertumbuhan pohon (perbedaan diameter setinggi dada/DBH) dengan beberapa karakteristik kayu. Pohon contoh yang digunakan mewakili tiga tingkat laju pertumbuhan yang berbeda, yakni lambat, sedang, dan cepat tumbuh. Laju pertumbuhan ditetapkan berdasarkan rata-rata DBH dan standar deviasinya dari semua pohon yang terdapat dalam sebuah petak ukur berukuran 50 m x 50 m yang dibuat untuk mewakili seluruh areal tegakan. Mutu pertumbuhan pohon dievaluasi berdasarkan DBH, tinggi total (TT), tinggi bebas cabang (TBC), jumlah cabang, jumlah mata kayu lepas, serta tingkat kesilindrisan dan bentuk penampang lintang log. Dalam kaitannya dengan sifat dan karakteristik kayu, mutu pertumbuhan pohon dievaluasi berdasarkan juvenilitas dan variasi radial lebar riap tumbuh. Masing-masing pohon contoh diambil disk setebal 6 cm dari ketinggian 130 cm di atas permukaan tanah dan log sepanjang 100 cm dari ketinggian 20 cm di atas permukaan tanah. Disk dijadikan contoh uji per segmen dari empulur ke kulit untuk pengukuran lebar riap tumbuh dan evaluasi juvenilitas, sedangkan log dikonversi jadi papan dan selanjutnya dijadikan contoh uji keawetan alami kayu yang mewakili bagian gubal, teras, dan peralihan. Juvenilitas dilakukan dengan dua pendekatan, yakni pengamatan langsung dan segmented regression model. Hasil penelitian menunjukkan mutu pertumbuhan pohon jati inti umur 8 tahun tergolong sedang. Jumlah mata kayu lepas sedikit (4 buah per 4 m), rata-rata TBC > 4 m, 50% log yang dihasilkan silindris, lurus, dan bulat; namun pohon belum menghasilkan kayu dewasa dan bercabang banyak. Laju pertumbuhan tidak mempengaruhi mutu pertumbuhan pohon kecuali TT, TBC, dan mutu log; serta tidak mempengaruhi karakteristik kayu. Pohon yang laju pertumbuhnya lambat cenderung lebih rendah dan lebih pendek TBCnya, namun mutu log yang dihasilkan lebih baik (lebih silindris, lebih sedikit mata kayu lepas dan lebih bulat). Dari segi keawetan alami, kayu jati dari pohon yang laju pertumbuhannya cepat masuk ke dalam Kelas Awet I, sedangkan kayu-kayu dari pohon yang laju pertumbuhannya sedang dan lambat masuk Kelas Awet III., Muna teakwood is a species that is widely used as raw material for high-quality furniture. The availability of this wood is decreasing year by year due to the long cutting cycle (± 50 years). Since the last decade, fast-growing Muna teak, better known as superior Muna teak, has been developed. The seedlings was exposed to gamma rays. Several properties of this wood have been studied, but the quality of tree growth and natural durability level of wood have not been investigated yet. Therefore, the aims of this study were to evaluate the growth quality of the 8-year-old superior Muna teak trees and to examine the relationship between tree growth rate (difference in
Keyword: juvenility, Muna Island, natural durability, superior teak, tree growth

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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