Judul: Studi rancang bangun menara pendingin dari kayu
Abstrak: Pembangunan menara pendingin di Indonesia terus meningkat terutama di sektor industri dan energi yang membutuhkan pengoperasian menara pendingin.
Keyword: Cooling tower, rancang bangun

Judul: Efektivitas pengawetan kayu keruing (Dipterocarpus sp) dengan bahan pengawet CCA untuk konstruksi menara pendingin (Cooling Tower)
Abstrak: Beberapa jenis kayu yang sekarang telah lazim digunakan untuk bahan konstruksi menara pendingin, misalnya redwood (Sequioa sempervirens Endl.), nampaknya sulit atau memerlukan waktu lama untuk diganti dengan jenis kayu lain. Hal ini mengingat jenis kayu Indonesia sebagian besar memiliki kelas awet yang rendah. Dengan demikian diperlukan usaha-usaha untuk meningkatkan kualitas jenis- jenis kayu Indonesia agar memenuhi persyaratan sebagai bahan konstruksi menara pendingin sehingga dapat menghilangkan ketergantungan terhadap jenis kayu asing (exotic species). Dari alternatif pemilihan kayu yang memungkinkan untuk dikembangkan, kayu keruing (Dipterocarpus sp.) merupakan salah satu jenis kayu yang memenuhi persyaratan sebagai bahan konstruksi menara pendingin. Mengingat pen- tingnya usaha untuk mengoptimalkan pemanfaatan sumberdaya hutan Indonesia maka perlu kiranya dilakukan penelitian tentang efektivitas pengawetan kayu keruing dengan bahan pengawet CСА.
Keyword: kayu keruing

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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