Judul: Pengaruh Laju Pembakaran terhadap Sifat Fisis, Tampilan Permukaan, dan Keawetan Kayu Mindi dan Kayu Pinus.
Abstrak: Kayu-kayu terpapar cuaca secara alami (naturally weathered wood) diminati sebagai bahan baku mebel karena terkesan elegan dan antik. Karena membutuhkan waktu yang sangat lama, natural weathered wood dapat diganti dengan kayu hasil pemaparan buatan (artificial weathered wood). Penelitian ini bertujuan untuk mempelajari pengaruh perbedaan laju pembakaran terhadap sifat fisis, tampilan, dan keawetan kayu mindi dan pinus. Laju pembakaran yang ditetapkan ada dua, yakni 0.5 dan 1.0 detik/cm2. Sifat fisis dan keawetan kayu diuji mengikuti prosedur sesuai dengan masing-masing standar, sedangkan tampilan permukaan diamati secara visual. Hasil penelitian menunjukkan bahwa laju pembakaran dan jenis kayu memengaruhi KA, kerapatan, BJ, pengurangan tebal, dan tampilan kayu, sedangkan keawetan lebih dipengaruhi oleh jenis kayu. Laju pembakaran yang lebih tinggi mengakibatkan KA, kerapatan, dan BJ kayu berkurang, sedangkan pengurangan tebalnya bertambah. Secara umum, proses pembakaran menurunkan tingkat keawetan kayu. Kayu-kayu hasil pembakaran yang dihasilkan masih dapat dijadikan bahan baku pembuatan mebel karena tampilan permukaannya menjadi lebih bernilai estetika dengan kelas kuat yang tidak berubah.
Keyword: artificial weathering, keawetan, laju pembakaran, naturally weathered wood, sifat fisis

Judul: Pengaruh Pemaparan Alami terhadap Sifat Fisis dan Mekanis Berbagai Jenis Sambungan Kayu
Abstrak: Perubahan sifat fisis dan mekanis kayu atau produk kayu yang diaplikasikan di luar ruangan disebabkan oleh berbagai faktor. Sinar ultraviolet dan kelembapan merupakan agen utama penyebab kerusakan pada kayu. Sambungan pada produk kayu juga penyebab turunnya sifat fisis dan mekanis pada kayu. Tujuan penelitian ini adalah menentukan perubahan sifat fisis dan mekanis yang terjadi pada berbagai jenis sambungan kayu meranti (Shorea spp.) dan keruing (Dipterocarpus spp.) akibat pemaparan alami selama 210 hari. Papan kayu meranti dan keruing dipotong dan dibentuk menjadi non joint (kontrol), butt joint, scarf joint, dado joint dan finger joint. Contoh uji diletakkan pada rak pemaparan selama 210 hari. Selama masa pemaparan, dilakukan pengujian sifat fisis setiap 15 hari dan sifat mekanis setiap 30 hari. Hasil penelitian ini menunjukkan sifat fisis dan mekanis dari sambungan kayu menurun selama pemaparan 210 hari. Finger joint meranti merupakan jenis sambungan yang paling tahan terhadap penurunan sifat fisis dan mekanis akibat pemaparan.
Keyword: butt joint, dado joint, finger joint, scarf joint, weathering

Judul: DNA Extraction and Characterization of Salmonella‟s Lytic Bacteriophage Genome
Abstrak: Bacteriophages are ubiquitous in nature and are known to proliferate wherever their bacterial hosts exist. Their virion particles can exist independently outside the host, however all phages are need their host to propagate. Several phages are highly specific to host cell surface receptors and any slight changes in structure results in little or no interaction between the phage and its host. Salmonella‟s phage isolated from sewage water where their bacteria exist. Three isolated of phages (phages 15, 19 and 38) were used in this research that concentrated using three types of methods. PEG/ NaCl method was firstly used to concentrate the phages based on their molecular weight to precipitate the phage particles during centrifugation. The second method was Scraping Plaque method. In this method, overlay plaques were scraped and collected in SM buffer to get phage concentrates. Enrichment method was the last method used to concentrate the phages. Phage genome isolation was done using two methods i.e. EDTA/SDS and Proteinase K methods. The first method was done using DNase I to eliminate bacterial DNA followed by SDS/EDTA treatment to release phages DNA and phenol-chloroform-isoamyl alcohol to extract the DNA. DNA was collected by isopropanol extraction. While in Proteinase K method, bacterial DNA was eliminated by DNase I and Proteinase K/SDS was used to degrade phages capsids and ethanol for DNA precipitation. The result showed that PEG/NaCl method resulted the highest phage concentration for phage 15 and phage 19, while scrapping method was the highest for phage 38. The quantity and purity of extracted DNA were low for PEG/NaCl and Scraping methods, while Enrichment method was higher indicated higher purity. Run on agarose gel electrophoresis of extracted DNA confirmed that Enrichment method results were the best while scraping and PEG/NaCl method was appeared smear background. Based on DNA genome size determination, the bacteriphages of Salmonella sp were comparable with other study of Salmonella phages. Phage P15 with genome size of 39,5 kb was close to phage epsilon15. Phage P19 with genome size of 41 kb was close to phage ST160. And phage P38 with genome size of 48,5 kb was close to phage Gifsy-1.
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