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House, Senate Committees Approve Bills That Include Influenza Pandemic Funds
The Senate Appropriations Committee on Thursday voted unanimously to approve a $91.3 billion defense and foreign aid spending bill that includes President Obama"s request for $1.5 billion in emergency funds to fight a potential influenza pandemic, the AP/Winston-Salem Journal reports. The House version of the bill, approved Thursday in a 368-60 vote, adds $500 million to the pandemic preparedness funds (AP/Winston-Salem Journal, 5/15). Last month, the public health emergency involving the H1N1 influenza virus spurred congressional lawmakers to rethink the elimination of $870 million from the economic stimulus package that would have been used to combat an influenza pandemic. Democratic legislators eliminated the funds in order to garner support from congressional Republicans to pass the stimulus package (Kaiser Daily Health Policy Report, 4/28).
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Scientists Track Chemical Changes In Cells As They Endure Extreme Conditions
One of nature"s most gripping feats of survival is now better understood. For the first time, scientists from the U.S. Department of Energy"s Lawrence Berkeley National Laboratory observed the chemical changes in individual cells that enable them to survive conditions that should kill them.
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Study Shows Teen Contraception Use Declining, Level Of Sexual Activity Unchanged
After years of declining teenage pregnancy rates and improved teen contraception use during the 1990s and early 2000s, the trends appeared to have flattened or even reversed among some groups of teens in recent years, according to a study from Columbia University"s Mailman School of Public Health and the Guttmacher Institute, the Christian Science Monitor reports. Researchers found that from 2003 to 2007, teens" contraceptive use declined by 10%, while their level of sexual activity did not change. The decrease in contraceptive use was particularly prevalent among black teens. The figures take into account the rate of contraception use as well as the types of contraceptives used, as methods vary in effectiveness. Teen condom use leveled off and in some cases declined, according to the study. The study also reported that the teen birth rate increased by 5% from 2005 to 2007. According to the study"s authors, the findings suggest a link between declining teen contraception use and the rise in abstinence-only education during former President George W. Bush"s administration. President Obama"s fiscal year 2010 budget proposal calls for redirecting some abstinence-only funds toward increased comprehensive sex education, the Monitor reports. In addition to the effects of abstinence-only sex education, the decline in condom use also could be tied to lessening concern about sexually transmitted infections, including HIV/AIDS. A shift in the teen population to include a higher number of Hispanics -- who have the highest rates of teen pregnancy and birth -- also could contribute to the findings. Laura Lindberg, one of the study"s authors and a senior research associate at Guttmacher, said, "In the end, this story is really about the loss of momentum." She added that although the statistical changes are small, "they raise concern about what the next few years will bring in this country." Sarah Brown, director of the National Campaign To Prevent Teen and Unplanned Pregnancy, noted that the proportion of births to unmarried women, particularly among women ages 20 to 24, also is on the upswing (Feldmann, Christian Science Monitor, 6/18).
Diagnostics

Electronic Nose Created To Detect Skin Vapors

A team of researchers from the Yale University (United States) and a Spanish company have developed a system to detect the vapours emitted by human skin in real time. The scientists think that these substances, essentially made up of fatty acids, are what attract mosquitoes and enable dogs to identify their owners. "The spectrum of the vapours emitted by human skin is dominated by fatty acids. These substances are not very volatile, but we have developed an "electronic nose" able to detect them", Juan Fernç¡ndez de la Mora, of the Department of Mechanical Engineering at Yale University (United States) and co-author of a study recently published in the Journal of the American Society for Mass Spectrometry, tells SINC. The system, created at the Boecillo Technology Park in Valladolid, works by ionising the vapours with an electrospray (a cloud of electrically-charged drops), and later analysing these using mass spectrometry. This technique can be used to identify many of the vapour compounds emitted by a hand, for example. "The great novelty of this study is that, despite the almost non-existent volatility of fatty acids, which have chains of up to 18 carbon atoms, the electronic nose is so sensitive that it can detect them instantaneously", says Fernç¡ndez de la Mora. The results show that the volatile compounds given off by the skin are primarily fatty acids, although there are also others such as lactic acid and pyruvic acid. The researcher stresses that the great chemical wealth of fatty acids, made up of hundreds of different molecules, "is well known, and seems to prove the hypothesis that these are the key substances that enable dogs to identify people". The enormous range of vapours emitted by human skin and breath may not only enable dogs to recognise their owners, but also help mosquitoes to locate their hosts, according to several studies. World record for detecting explosives Aside from identifying people from their skin vapours, another of the important applications of the new system is that it is able to detect tiny amounts of explosives. The system can "smell" levels below a few parts per trillion, and has been able to set a world sensitivity record at "2x10-14 atmospheres of partial pressure of TNT (the explosive trinitrotoluene)". The "father" of ionisation using the mass spectrometry electrospray is Professor John B. Fenn, who is currently a researcher at the University of Virginia (United States), and in 2002 won the Nobel Prize in Chemistry for using this technique in the analysis of proteins. References: Pablo Martç­nez Lozano y Juan Fernç¡ndez de la Mora. "On-line Detection of Human Skin Vapors". Journal of the American Society for Mass Spectrometry 20 (6): 1060-1063, 2009. Pablo Martç­nez Lozano, Juan Rus, Gonzalo Fernç¡ndez de la Mora, Marta Hernç¡ndez, y Juan Fernç¡ndez de la Mora. "Secondary Electrospray Ionization (SESI) of Ambient Vapors for Explosive Detection at Concentrations Below Parts Per Trillion". Journal of the American Society for Mass Spectrometry 20 (2): 287-294, 2009. SINC FECYT - Spanish Foundation for Science and Technology


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