@article {3093,
	title = {Biofilm Formation by Clostridium ljungdahlii Is Induced by Sodium Chloride Stress: Experimental Evaluation and Transcriptome Analysis.},
	journal = {PLoS One},
	volume = {12},
	year = {2017},
	month = {2017},
	pages = {e0170406},
	abstract = {<p>The acetogen Clostridium ljungdahlii is capable of syngas fermentation and microbial electrosynthesis. Biofilm formation could benefit both these applications, but was not yet reported for C. ljungdahlii. Biofilm formation does not occur under standard growth conditions, but attachment or aggregation could be induced by different stresses. The strongest biofilm formation was observed with the addition of sodium chloride. After 3 days of incubation, the biomass volume attached to a plastic surface was 20 times higher with than without the addition of 200 mM NaCl to the medium. The addition of NaCl also resulted in biofilm formation on glass, graphite and glassy carbon, the latter two being often used electrode materials for microbial electrosynthesis. Biofilms were composed of extracellular proteins, polysaccharides, as well as DNA, while pilus-like appendages were observed with, but not without, the addition of NaCl. A transcriptome analysis comparing planktonic (no NaCl) and biofilm (NaCl addition) cells showed that C. ljungdahlii coped with the salt stress by the upregulation of the general stress response, Na+ export and osmoprotectant accumulation. A potential role for poly-N-acetylglucosamines and D-alanine in biofilm formation was found. Flagellar motility was downregulated, while putative type IV pili biosynthesis genes were not expressed. Moreover, the gene expression analysis suggested the involvement of the transcriptional regulators LexA, Spo0A and CcpA in stress response and biofilm formation. This study showed that NaCl addition might be a valuable strategy to induce biofilm formation by C. ljungdahlii, which can improve the efficacy of syngas fermentation and microbial electrosynthesis applications.</p>},
	keywords = {Biofilms, Biomass, Carbon, Clostridium, Culture Media, Culture Techniques, Fimbriae, Bacterial, Flagella, Gene Expression Profiling, Gene Expression Regulation, Bacterial, Glass, Graphite, Osmotic Pressure, RNA, Bacterial, RNA, Ribosomal, Sodium Chloride, Spores, Bacterial, Stress, Physiological},
	issn = {1932-6203},
	doi = {10.1371/journal.pone.0170406},
	author = {Philips, Jo and Rabaey, Korneel and Lovley, Derek R and Vargas, Madeline}
}
@article {1722,
	title = {Influence of a new virostatic compound on the induction of enzymes in rat liver.},
	journal = {Arzneimittelforschung},
	volume = {25},
	year = {1975},
	month = {1975 Sep},
	pages = {1426-9},
	abstract = {<p>The virostatic compound N,N-diethyl-4-[2-(2-oxo-3-tetradecyl-1-imidazolidinyl)-ethyl]-1-piperazinecarboxamide-hydrochloride (5531) was analyzed as to its effect on the induction of tryptophan-pyrrolase and tyrosineaminotransferase in rat liver. 1. The basic activity of the enzymes was not influenced by the substance either in normal or in adrenalectomized animals. 2. The induction of the enzymes by cortisone increased in the presence of the compound whereas the substrate induction remained unchanged. 3. The induction of tyrosine-aminotransferase by dexamethasonephosphate in tissue culture is inhibited if the dose of compound 5531 is higher than 5 mug/ml.</p>},
	keywords = {Adrenalectomy, Animals, Antiviral Agents, Cortisone, Culture Techniques, Dose-Response Relationship, Drug, Enzyme Induction, Female, Imidazoles, Liver, Piperazines, Rats, Time Factors, Tryptophan Oxygenase, Tyrosine, Tyrosine Transaminase},
	issn = {0004-4172},
	author = {Kr{\"o}ger, H and Donner, I and Skiello, G}
}
