Judul: Effect of Strand Pretreatment on Characteristics of  Oriented Strand Board from Andong Bamboo, Tali Bamboo, and Their Mixtures
Abstrak: Penelitian ini bertujuan mengevaluasi pengaruh perlakuan pendahuluan pada strand terhadap karakteristik Oriented Strand Board (OSB) bambu andong, tali, dan campurannya. Perlakuan pendahuluan steam diterapkan pada strand dengan suhu 126 ̊C selama 1 jam dalam tekanan 0,14 MPa serta dilanjutkan dengan pembilasan NaOH 1%. Strand dicampur dengan perekat fenol formaldehid (PF) pada konsentrasi 8%. Papan berukuran (30x30x0,9) cm3 disusun sebanyak 3 lapis dengan berbagai nisbah campuran. Nisbah lapisan papan yang digunakan adalah 25:50:25 dengan kerapatan target ± 0,7 g.cm-3 . Pengujian sifat fisis dan mekanis OSB mengacu pada standar JIS A 5908 (2003) yang hasilnya dibandingkan dengan standar CSA 0437.0 (Grade O-1). Hasil penelitian menunjukkan bahwa perlakuan steam bilas NaOH 1% pada strand dapat meningkatkan stabilitas dimensi dan kekuatan mekanis (keteguhan rekat) OSB. Peningkatan rasio jenis strand bambu tali berbanding lurus dengan stabilitas dimensi dan keteguhan rekat OSB. Papan dengan nisbah campuran 50:50 menghasilkan karakteristik yang paling optimal. Keseluruhan OSB memenuhi standar CSA 0437.0 (Grade O-1)., The objectives of this research were evaluated the effect of strand pretreatment on the characteristics of Oriented Strand Board (OSB) from andong bamboo, tali bamboo, and their mixtures. Steam treatment was applied to the strand with a temperature of 126 oC for 1 hour under pressure of 0.14 MPa and followed by rinsing of 1% NaOH. Strand were mixed with phenol formaldehyde (PF) adhesive at a concentration of 8%. Three layered of OSB was made with the size of (30x30x0.9) cm3 with various mix ratio of strand types. The shelling ratio of boards is 25:50:25 with target density of ± 0,7 g.cm-3 . The physical and mechanical properties test of OSB refers to the JIS A 5908 (2003) standard and the results are compared with the CSA 0437.0 (Grade O-1) standard. The results show that the steam-treated follow by 1% NaOH rinse on the strand increase the dimensional stability and mechanical strength (internal bond) of OSB. The increase in mix ratio of tali bamboo is directly proportional to the dimensional stability and internal bonding of OSB. Boards with mix ratio of 50:50 produce the most optimal characteristics. All OSBs meet CSA 0437.0 (Grade O-1) standard.
Keyword: bambu andong, bambu tali, campuran, OSB, perlakuan pendahuluan, andong bamboo, mixtures, pretreatment, tali bamboo

Judul: Pengaruh modifikasi strand dan kadar perekat terhadap sifat fisis dan mekanis OSB bambu tali
Abstrak: Bambu saat ini dapat digunakan sebagai substitusi kayu sebagai bahan baku OSB karena OSB dari strand bambu memiliki daya serap air dan pengembangan tebal yang lebih rendah dari OSB berbahan baku kayu. Penelitian ini bertujuan untuk menganalisis efek dari modifikasi steam pada strand dengan pembilasan air dan NaOH 1% terhadap sifat fisis dan mekanis OSB bambu tali. Penelitian ini menggunakan beberapa proses, dimulai dari perlakuan disteam pada 126 oC selama 1 jam dengan tekanan 1.4 kg/cm2 dan pembilasan strands dengan air dan NaOH 1%, pembuatan OSB, analisis kelarutan komponen kimia strand bambu (TAPPI T 204 om-88, TAPPI T 207 om-88, dan TAPPI T 212 om- 88), pengujian sifat fisis-mekanis (JIS A 5908:2003) dan kadar pati (SII 0231-79). Hasil penelitian ini menunjukkan strand bambu tali yang tergolong baik karena berada dikisaran SR 60-100 dan nilai AR rata-rata 3. Modifikasi strand dengan steam menurunkan kadar ekstraktif. Modifikasi steam bilas NaOH 1% dan steam tanpa bilas dengan kadar perekat 8% meningkatkan sifat fisis dan mekanis OSB bambu tali. OSB bambu tali dengan modifikasi steam yang dibilas air, NaOH 1%, maupun tanpa bilas dengan kadar perekat 8% telah memenuhi standar CSA 0437 (Grade 0-1) kecuali MOE tegak lurus serat
Keyword: Mechanical properties, OSB, physical properties, steamed modification, tali bamboo

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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