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SERS detection of the biomarker hydrogen cyanide from Pseudomonas aeruginosa cultures isolated from cystic fibrosis patients.
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Pseudomonas aeruginosa is the primary cause of chronic airway infections in cystic fibrosis (CF) patients. Persistent infections are seen from the first P. aeruginosa culture in about 75% of young CF patients, and it is important to discover new ways to detect P. aeruginosa at an earlier stage. The
Hydrogen cyanide as a biomarker for Pseudomonas aeruginosa in the breath of children with cystic fibrosis.
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OBJECTIVE
Hydrogen cyanide (HCN) is emitted by Pseudomonas aeruginosa (PA) in vitro. We hypothesized that exhaled HCN could be measured using Selected Ion Flow Tube Mass Spectrometry (SIFT-MS) and that concentrations would be higher in children with cystic fibrosis (CF) and PA infection than in
Isocitrate lyase supplies precursors for hydrogen cyanide production in a cystic fibrosis isolate of Pseudomonas aeruginosa.
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Pseudomonas aeruginosa colonizes and can persist in the lungs of cystic fibrosis (CF) patients for decades. Adaptation of P. aeruginosa to the CF lung environment causes various genotypic and phenotypic alterations in the bacterium that facilitate persistence. We showed previously that isocitrate
Exhaled breath hydrogen cyanide as a marker of early Pseudomonas aeruginosa infection in children with cystic fibrosis.
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Hydrogen cyanide is readily detected in the headspace above Pseudomonas aeruginosa cultures and in the breath of cystic fibrosis (CF) patients with chronic (P. aeruginosa) infection. We investigated if exhaled breath HCN is an early marker of P. aeruginosa infection. 233 children with CF who were
Hydrogen cyanide concentrations in the breath of adult cystic fibrosis patients with and without Pseudomonas aeruginosa infection.
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Elevated concentrations of hydrogen cyanide (HCN) have been detected in the headspace of Pseudomonas aeruginosa (PA) cultures and in the breath of children with cystic fibrosis (CF) and PA infection. The use of mouth-exhaled breath HCN as a marker of PA infection in adults is more difficult to
Quantification of Pseudomonas aeruginosa hydrogen cyanide production by a polarographic approach.
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Pseudomonas aeruginosa is an opportunistic pathogen responsible for numerous infections acquired in hospital especially in persons whose immune systems are weakened, such as with patient suffering from AIDS or cystic fibrosis. This bacterium produces a great diversity of virulence factors among them
Is hydrogen cyanide a marker of Burkholderia cepacia complex?
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Biofilm cultures of Burkholderia cepacia complex (BCC) infection have been found to generate the nonvolatile cyanide ion. We investigated if gaseous hydrogen cyanide (HCN) was a marker of BCC infection. Selected ion flow tube mass spectrometry analysis showed HCN was not elevated in the headspace of
LasR Variant Cystic Fibrosis Isolates Reveal an Adaptable Quorum-Sensing Hierarchy in Pseudomonas aeruginosa.
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Chronic Pseudomonas aeruginosa infections cause significant morbidity in patients with cystic fibrosis (CF). Over years to decades, P. aeruginosa adapts genetically as it establishes chronic lung infections. Nonsynonymous mutations in lasR, the quorum-sensing (QS) master regulator, are common in CF.
Hydrogen cyanide, a volatile biomarker of Pseudomonas aeruginosa infection.
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Since we first recognized the regular presence of gaseous hydrogen cyanide, HCN, in the headspace of plate cultures of the bacterium Pseudomonas aeruginosa, PA, derived from sputum of cystic fibrosis, CF, patients, and following crucial ion chemistry research that allowed accurate quantification of
An investigation of suitable bag materials for the collection and storage of breath samples containing hydrogen cyanide.
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The SPACE study will assess exhaled breath hydrogen cyanide (HCN) concentrations as a marker of Pseudomonas aeruginosa (PA) infection in 240 children with cystic fibrosis (CF). It will use off-line selected ion flow tube mass spectrometry (SIFT-MS) analysis and so we needed to investigate which
On the features, successes and challenges of selected ion flow tube mass spectrometry.
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The major features of the selected ion flow tube mass spectrometry (SIFT-MS) analytical method that was conceived and designed for the analysis, in real time, of air obviating sample collections into bags or extraction by pre-concentration of trace compounds onto surfaces are reviewed. The unique
The transcriptional regulator AlgR controls cyanide production in Pseudomonas aeruginosa.
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Pseudomonas aeruginosa is an opportunistic pathogen that causes chronic lung infections in cystic fibrosis (CF) patients. One characteristic of P. aeruginosa CF isolates is the overproduction of the exopolysaccharide alginate, controlled by AlgR. Transcriptional profiling analyses comparing mucoid
From molecules in space to molecules in breath.
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The evolution of the selected ion flow tube, SIFT, used to study ion-molecule reactions of interstellar significance, to the selected ion flow tube mass spectrometry, SIFT-MS, analytical technique is described briefly. Focus is placed on the application of SIFT-MS to breath analysis and its
On the importance of accurate quantification of individual volatile metabolites in exhaled breath.
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It is argued that shortcomings of certain approaches to breath analysis research based on superficial interpretation of non-quantitative data are inadvertently inhibiting the progression of non-invasive breath analysis into clinical practice. The objective of this perspective is to suggest more
Impact of D-amino acid dehydrogenase on virulence factor production by a Pseudomonas aeruginosa.
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Chronic Pseudomonas aeruginosa infections remain the leading cause of lung dysfunction and mortality for cystic fibrosis (CF) patients. Many other bacteria inhabit the CF lung, but P. aeruginosa utilizes novel strategies that allow it to colonize this environment as the predominant bacterial
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