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Individual Bacterial Cells Are Capable Of Quorum Sensing When Confined In Small Volumes
Infections of wounds, pneumonia, etc. in hospitals in particular are often caused by bacteria called Pseudomonas aeruginosa. Once they reach a certain density, colonies of Pseudomonas aeruginosa produce virulence factors and can enter into a slimy state, a biofilm, which prevents antibiotics from penetrating. The process of quorum sensing, which cells use to "sense" cell density, is triggered when the concentration of certain signaling compounds generated by the bacteria reaches a threshold level. A team working with Rustem F. Ismagilov at the University of Chicago has now demonstrated that the absolute number of cells is irrelevant; only the number of bacteria in a given volume plays a role. As the researchers report in the journal Angewandte Chemie, they were even able to trigger quorum-sensing processes in single cells when these were confined in extremely small volumes.
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Precursors To Corneal Transplant Failure; Patients Who Skip Glaucoma Treatment; Antibiotic-resistant Bugs And LASIK
The June issue of Ophthalmology, the journal of the American Academy of Ophthalmology, includes new insights on why some corneal transplants fail, why some patients skip their glaucoma medications, and why preventing infections after LASIK is a growing concern.
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Electronic Coding Overestimates Prevalence Of Barrett's Esophagus
In a review of more than 2,000 patients coded for Barrett"s esophagus, electronic diagnosis overestimated the prevalence of the disease according to researchers in California. They found that only 61.9 percent of patients assigned a billing diagnosis code for Barrett"s esophagus actually had Barrett"s esophagus after a manual record review. The study evaluated the accuracy of diagnostic codes for Barrett"s esophagus by contrasting codes from electronic databases with diagnoses from a detailed medical record review. Researchers also evaluated the reproducibility of a pathologic diagnosis of Barrett"s esophagus between two pathologists and between a single pathologist on two different occasions. The study appears in the May issue of GIE: Gastrointestinal Endoscopy, the monthly peer-reviewed scientific journal of the American Society for Gastrointestinal Endoscopy (ASGE).
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Treatable Hormonal Condition Sometimes Overlooked In Infertility Patients

A condition known as congenital adrenal hyperplasia, or CAH, is easily treatable but frequently overlooked or misdiagnosed, leading to infertility and other "perplexing symptoms," the New York Times reports. CAH is a hormone deficiency that leads to excess production of androgens, which can hinder ovulation in women and cause low sperm count in men. It also can cause short stature, body odor, acne, irregular menstruation and excessive hair growth. The condition can be diagnosed through a blood test and treated with small doses of the steroid dexamethasone, which can reverse symptoms in three months to two-and-one-half years.According to Maria New, a leading authority on CAH and a professor of pediatrics and human genetics at Mount Sinai School of Medicine, the disease occurs in one in every 100 people in the general population. It is more common among certain ethnic groups, occurring in one in 27 Ashkenazi Jews and one in 40 Hispanics. Not everyone with the condition has symptoms or needs to be treated. The most severe form of the disease, classic CAH, can result in ambiguous genitalia in girls, while the milder nonclassical form sometimes produce no symptoms, the Times reports.Many fertility clinics do not test for the disease or only test after attempting other treatments. Some obstetricians are unaware of CAH and its effect on fertility, according to Zev Rosenwaks, director of the Center for Reproductive Medicine at New York Presbyterian-Weill Cornell hospital. CAH also can be confused with polycystic ovarian syndrome -- which has some similar symptoms -- or early puberty in younger patients (Tarkan, New York Times, 7/7). Reprinted with kind permission from http://www.nationalpartnership.org. You can view the entire Daily Women"s Health Policy Report, search the archives, or sign up for email delivery here. The Daily Women"s Health Policy Report is a free service of the National Partnership for Women & Families, published by The Advisory Board Company. © 2009 The Advisory Board Company. All rights reserved.


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