Browsing by Subject "breathing"

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    Croup and Your Child
    (2010-07-21) Campo-Soria, Claudia
    Croup is one of the most common childhood illnesses that cause hoarseness, a barking cough and noisy breathing. These symptoms are believed to occur as a result of swelling of the voice box due to a viral infection. Croup mostly occurs in infants and young children between the ages of 6 months and 3 year of age. This age group is most distressing for parents when they are sick because children have limited language development to effectively communicate their symptoms or feelings. This PET is designed to ask and answer the more basic questions that distressed parents might have when their child is ill. It also addresses signs and symptoms that parents should be looking for when they become severely ill and should seek medical attention. Treatment options are also talked about, so that each parent can make an informed decision about their child’s well being.
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    Mean mass-specific metabolic rates are strikingly similar across life’s major domains: Evidence for life’s metabolic optimum
    (National Academy of Sciences, 2008) Makarieva, Anastassia M; Gorshkova, Victor G; Li, Bai-Lian; Chown, Steven L; Reich, Peter B; Gavrilov, Valery M
    A fundamental but unanswered biological question asks how much energy, on average, Earth’s different life forms spend per unit mass per unit time to remain alive. Here, using the largest database to date, for 3,006 species that includes most of the range of biological diversity on the planet—from bacteria to elephants, and algae to sapling trees—we show that metabolism displays a striking degree of homeostasis across all of life. We demonstrate that, despite the enormous biochemical, physiological, and ecological differences between the surveyed species that vary over 1020-fold in body mass, mean metabolic rates of major taxonomic groups displayed at physiological rest converge on a narrow range from 0.3 to 9 W kg 1. This 30-fold variation among life’s disparate forms represents a remarkably small range compared with the 4,000- to 65,000-fold difference between the mean metabolic rates of the smallest and largest organisms that would be observed if life as a whole conformed to universal quarterpower or third-power allometric scaling laws. The observed broad convergence on a narrow range of basal metabolic rates suggests that organismal designs that fit in this physiological window have been favored by natural selection across all of life’s major kingdoms, and that this range might therefore be considered as optimal for living matter as a whole.