Judul: Pengaruh berat jenis dan ketebalan kayu terhadap keteguhan lentur statis beberapa jenis kayu perdagangan
Abstrak: Penggunaan kayu sebagai bahan konstruksi yang tidak rasional (berlebihan), terutama di Indonesia, dapat menyebabkan pemborosan kayu. Hal ini dikarenakan belum diterapkannya asas-asas rekayasa atau keteknikan kayu, guna mencapai optimalisasi penggunaan kayu, atau kurangnya pengetahuan mengenai sifat-sifat kayu khususnya mengenai sifat mekanis kayu sebagai bahan konstruksi. Salah satu cara untuk mengatasi hal tersebut adalah dengan melihat pengaruh dan hubungan antara sifat yang dimiliki kayu dengan membuat suatu perkiraan atau pendugaan suatu sifat kayu atas dasar sifat-sifat yang lain.
Keyword: kayu

Judul: Pengaruh Pengawetan terhadap Sifat Mekanis Tiga Jenis Kayu
Abstrak: Penggunaan kayu sebagai bahan bangunan pada saat ini dan masa yang akan datang diperkirakan akan terus meningkat. Hal ini perlu diimbangi dengan umur pakai (life service) kayu yang memadai karena fakta yang ada mengungkapkan bahwa hanya 15-20 persen jenis-jenis kayu Indonesia yang memiliki keawetan tinggi (Kelas Awet I dan II) (Oey Djoen Seng, 1964). Selain itu mengingat pasokan kayu di pasaran cenderung semakin berkurang akhir-akhir ini karena semakin terbatasnya jumlah dan kualitas kayu komersial, diperkirakan pasokan kayu di masa yang akan datang akan beralih dari jenis komersial ke jenis non komersial atau jenis kayu tak dikenal (lesser known species) baik dari hutan alam maupun hutan rakyat (Rudi, 2002). Jenis-jenis kayu tersebut cenderung memiliki keawetan alami yang rendah. Salah satu usaha untuk meningkatkan umur pakai kayu adalah melalui proses pengawetan kayu (Oey Djoen Seng, 1964). Sayangnya, beberapa hasil penelitian memperlihatkan bahwa proses pengawetan berpengaruh negatif terhadap kekuatan kayu. Oleh karena itu, seberapa jauh pengaruh pengawetan kayu terhadap kekuatan khususnya pada kayu-kayu yang tergolong lesser known species perlu diteliti agar penggunaannya sebagai bahan bangunan tetap maksimal.
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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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