Judul: Pengaruh Kombinasi Strand, Kadar Perekat dan Beda Tekanan terhadap Sifat Fisis Mekanis Oriented Strand Board Kayu Mangium dan Afrika.
Abstrak: INTRODUCTION. Overexploitation for decades affecting reduction of round wood production from Indonesian natural forest, in the other hand round wood demands are increasing. This quality decline supporting composite products as an alternative. One of popular composite products is oriented strand board or commonly known as OSB. OSB is a panel from wood strand and compound with exterior adhesive and then hot pressed. There were many observation regarding for OSB made from community forest’s wood. The objectives of this research are to explain adhesive difference, acacia and african wood combination strand and difference of pressing on OSB manufacturing to its physical and mechanical properties and to determine the best treatment for OSB. Physical and mechanical properties test is refer to JIS A 5908 (2003) standard of particle board standard and CSA 0437.0 (Grade O-2) standard of OSB. MATERIAL AND METHOD. Variable used were wood species, adhesive content, and pressing. Mangium, African and mix of them used as OSB raw materials. Adhesive content used were 6%, 8% with 1% parafin added. Physical and mechanical properties observed were density, moisture content, water absorption, thickness swelling, modullus of elasticity (MOE), modullus of rupture (MOR), internal bonding and screw holding power. RESULTS. The average value resulted from physical properties test are : OSB’s average density about 0,50-0,62 g/cm3, the average moisture content is about 7,61-11,23%, water absorption average of OSB 2 hours is about 24,12-73,12%, water absorption average of OSB 24 hours is about 56,57-115,97%, the average value of thickness swelling OSB 2 hours is about 9,39-32,35%, the average value of thickness swelling OSB 24 hours is about 17,44-36,04%. The average value resulted from mechanical properties test are : the average dry MOE parallel to grain is about 21.518-39.019 kg/cm2, the average dry MOE perpendicular to grain is about 6.134-12.363 kg/cm2, the average wet MOE parallel to grain is about 3.435-22.278 kg/cm2, the average wet MOE perpendicullar to grain is about 2.078-8.316 kg/cm2, the average dry MOR parallel to grain is about 158,71-346,67 kg/cm2, the average dry MOR perpendicullar to grain is about 82,66-160,40 kg/cm2, the average wet MOR parallel to grain is about 52,12-223,22 kg/cm2, the average wet MOR perpendicullar to grain is about 34,66-135,61 kg/cm2, the average OSB internal bonding is about 1,24-7,72 kg/cm2, the average screw holding power is about 33,85-73,13 kg. OSB from Mangium wood with 8% of adhesive content and 25 kg/cm² is the finest OSB. Wheter, OSB from African wood with 6% of adhesive content, and pressing of 15 kg/cm² is the worst OSB. Wood species which gives the best effect is Mangium, followed by african wood and combination of them as the worst. The best adhesive content is 8% while the best pressing is 25 kg/cm².
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Judul: Physical and Mechanical Properties of Oriented Strand Board from Three Species of Plantation Wood at Various Resin Content
Abstrak: Tujuan penelitian ini adalah untuk menganalisis sifat fisis dan mekanis oriented strand board dari tiga jenis kayu afrika (Maesopsis eminii), mangium (Acacia mangium), dan sengon (Paraserianthes falcataria) dari hutan tanaman pada berbagai kadar perekat. Oriented strand board dibuat dengan nisbah lapisan (face:core:back) 1:2:1 dan kerapatan target 0,6 g/cm3. Perekat methylene diphenil di-isocyanate (MDI) digunakan pada kadar perekat 3%, 5%, dan 7%. Sifat fisis dan mekanis dievaluasi berdasarkan standar JIS A 5908:2003 dan hasilnya dibandingkan dengan standar OSB komersial CSA 0437.0 (Grade O-1). Hasil menunjukkan bahwa sifat fisis dan mekanis OSB meningkat seiring bertambahnya kadar perekat pada semua jenis kayu. Beberapa sifat fisis dan mekanis OSB memenuhi standar CSA 0437.0 (Grade O-1). Oriented strand board dari kayu afrika dan mangium dengan kadar perekat 7% memiliki sifat fisis dan mekanis yang lebih baik dibanding OSB lainnya., The objective of this study was to determine the physical and mechanical properties of oriented strand board from three wood species of plantation forests i.e. afrika (Maesopsis eminii), mangium (Acacia mangium), and sengon (Paraserianthes falcataria) at various resin content. Oriented strand board was made with a shelling ratio (face:core:back) of 1:2:1 and target density of 0,6 g/cm3. Methylene Diphenyl di-Isocyanate (MDI) adhesive was used with 3%, 5%, and 7% resin content. The physical and mechanical properties were evaluated based on JIS A 5908:2003 standard and the values were compared with CSA 0437.0 (Grade O-1) standard. The results show that the physical and mechanical properties of the OSB were increased as the resin content increased for all wood species. Some of the physical properties of the three wood species have met the standard criteria for CSA O437.0 (Grade O-1). Some of the mechanical properties of the OSB of the three wood species increase with increasing resin content. Oriented strand board prepared from africa and mangium wood with 7% resin content shows better physical and mechanical properties compared to the other OSB.
Keyword: Afrika wood, mangium, methylene diphenyl di-isocyanate, OSB, sengon

Judul: Leukemia pada kucing
Abstrak: Leukemia pada kucing adalah suatu penyakit yang sangat patogen, disebabkan oleh sejenis virus. Virus ini dikenal sebagai Feline Leukemia Virus atau FeLV. FeLV ini oleh beberapa ahli dikatakan hanya bersifat ganas pada hewan kucing. Penularannya bisa secara horizontal maupun congenital. Kucing pada semua tingkat umur dapat terserang oleh FeLV ini. Khusus pada bentuk "thymic leukemia", virus ini hanya menyerang anak-anak kucing berumur diba- wah 1 tahun. Kucing-kucing liar atau yang tidak terpeli- hara jarang sekali terinfeksi FeLV. Selain dari serangan virus FeLV itu sendiri, maka penyakit leukemia ini bisa disebabkan oleh beberapa fak- tor yang sudah ada dalam tubuh hewan dan sangat menunjang perkembangan penyakit ini, yaitu antara lain tumor, agen toksik, cedera oleh kecelakaan dan gangguan hemopoiesis. FeLV menyerang sel-sel darah dalam tubuh hewan se- hingga pembentukan darah berjalan tidak normal. Terlihat sel-sel darah yang belum dewasa sudah beredar dalam sir- kulasi darah. Bentuk dan jumlahnya tidak lagi seimbang dalam tubuh hewan kucing tersebut. Gejala klinis antara lain kekurusan, ikterus, anemia, lemah, anoreksia, dyspnoe, sulit menelan, batuk, dan membran mukosa pucat. Selain itu kelenjar pertahanan tubuh juga membengkak, kemudian terjadi hepatomegali, spleenomegali dan pembengkakan pada ginjal. Terbentuk massa tumor pada beberapa tempat. Secara biopsy pada sumsum tulang akan terlihat be- berapa perubahan. Sumsum tulang berwarna merah tua atau abu-abu. Konsistensinya lunak dan terdapat banyak sekali memproduksi sel darah putih. Melalui gambaran darah leukemia ini lebih mudah didiagnosa. Jumlah retikulosit rendah sekali. PCV 8-15%, hemoglobin menurun, sel darah putih (WBC) meningkat, lim- fosit meningkat, Alfaglobulin juga ada peningkatan, dan banyak eosinofil yang belum dewasa beredar dalam darah…dst
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