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ArtikelFree-Living Ice-Nucleating Active Bacteria from High Mountain Lake Habitats  
Oleh: Munti, Yuhana ; Hanselmann, Kurt
Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Microbiology Indonesia vol. 2 no. 3 (Dec. 2008), page 131-135.
Topik: High Mountain lake habitats; ice nucleation; 16 rRNA gene; free-living bacteria
  • Perpustakaan Pusat (Semanggi)
    • Nomor Panggil: MM78.2
    • Non-tandon: 1 (dapat dipinjam: 0)
    • Tandon: tidak ada
    Lihat Detail Induk
Isi artikelWe collected the culturable heterotrophic high mountain lake habitats and tested their capability to induce ice formation. Direct plating was carried out using low-nutrient medium at a temperature of between 3 and 4 C. As many as 84 isolates were recovered from gracial ice and natural biofilm growing on granite rocks surface. Six out of 84 isolates were capable of expressing the ice-nucleation phenotype. After autoclaving the cell suspension at 121 C for 15 min, isolate J78 was still able to retain the ability for ice formation. Heat-stable ice nuclei produced by ice-nucleating active bacteria have potential applications in biotechnology. Characterization of INA bacteria was performed employing live-dead Gram staining and molecular methods. Universal primers for bacteria (S-D-Bact-0008-b-S-20 and S-D-Bact-1524-a-A-18) were used for PCR to amplfy almost the full length of the 16S rRNA genes of selected INA isolates. Restriction fragment length polymorphism analysis resulted in 2 unique patterns, as represented by J43 and J83, respectively. based on DNA sequencing of 16S rRNA gene, isolate J43 (GeneBank accession no. AJ864852) was closely related to Pseudomonas mephitica (99.2% sequence similarity) and Janthinobacterium lividum (99% similarity), whereas isolate J83 (GeneBank accession no. AJ864859) showed 100% sequence identity to Pseudomonas fluorescens.
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