Two mucoid Pseudomonas aeruginosa strains and their non-mucoid revertants isolated from two different clinical origins (cystic fibrosis and bronchiectasis) were grown in various chemically defined media. The extracted exopolysaccharide was characterized by gas-liquid chromatography and 1H-NMR spectroscopy. The exopolysaccharide was always heterogeneous, with an alginate fraction and a neutral fraction essentially composed of glucose, galactose, rhamnose and hexosamines. The alginate composition (mannuronate/guluronate ratio and O-acetylation degree) changed according to the carbon source in nutrient media and whether the strains tested were responding differently to these environmental stimuli. In all cases, the best carbon source for the alginate production was glycerol: the two cystic fibrosis strains produced a predominantly O-acetylated alginate whereas only the mucoid bronchiectasis strain produced a polymannuronate exopolysaccharide.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0378-1097(92)90128-b | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Plant growth promotion via priming with volatile organic compounds emitted from strain EXTN-1.
Front Microbiol
January 2025
Research Institute of International Agriculture, Technology and Information, Hankyong National University, Anseong-si, Republic of Korea.
Volatile organic compounds (VOCs) produced by potential plant growth-promoting rhizobacteria (PGPR) play an important role in plant interactions. However, the mechanisms underlying this phenomenon are not well understood. Our findings show that the influence of VOCs from the PGPR strain (EXTN-1) on tobacco plant growth is dependent on the culture media used.
View Article and Find Full Text PDFFood advertising may influence food preferences and consumption. Due to these advertisements' role in health, the present study has updated the data available on television and radio food advertisements in Iran until 2020. Meanwhile, food advertisements on billboards have been analyzed for the first time.
View Article and Find Full Text PDFBiofiltration for odor mitigation in water resource recovery facilities.
Sci Total Environ
January 2025
Department of Civil Engineering, City College of New York, New York, NY 10031, United States.
Odor emissions, primarily from anthropogenic activities like waste treatment and industrial processes, pose significant challenges in urban areas, particularly near water resource recovery facilities. While these emissions are generally not toxic, they can adversely affect community wellbeing and investment, prompting stricter regulations in some regions. For example, New York State's hydrogen sulfide guidelines are more stringent than federal standards.
View Article and Find Full Text PDFNutrient control of splice site selection contributes to methionine addiction of cancer.
Mol Metab
January 2025
Department of Biological Chemistry, University of California, Irvine School of Medicine. Electronic address:
Objectives: Many cancer cells depend on exogenous methionine for proliferation, whereas non-tumorigenic cells can divide in media supplemented with the metabolic precursor homocysteine. This phenomenon is known as methionine dependence of cancer or methionine addiction. The underlying mechanisms driving this cancer-specific metabolic addiction are poorly understood.
View Article and Find Full Text PDFA Review of Food-Related Social Media and Its Relationship to Body Image and Disordered Eating.
Nutrients
January 2025
Department of Psychology, Toronto Metropolitan University, 350 Victoria St., Toronto, ON M5B 2K3, Canada.
Background/objectives: Appearance-related social media, such as "thinspiration" and "fitspiration" posts, have been shown to contribute to poor body image and disordered eating. Food-related social media is becoming increasingly popular; however, far less is known about its relationship to body image and disordered eating.
Methods: The current review searched PsycNet and PubMed (Medline) for all the literature examining food-related social media and its relationship with body image and/or disordered eating outcomes.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!