منابع مشابه
Oscillations at odds in the heart
303 C o m m e n t a r y Oscillations are everywhere in biology—the cell cycle, the heart beat, circadian rhythms, fertility cycles—life could not exist without them. They arise from time delays in the feedback circuits essential for regulating biological processes. As important as oscillations are to normal physiology, however, too many oscillators can spoil the broth of life. In the heart, the...
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E conomics and environmentalism are belief systems that shape their adherents’ way of thinking about the world. We might just as accurately characterize them as secular religions, which most theologians count as real religions (see, for example, Tillich 1963), but many people prefer to regard them as competing belief systems. Many (not all) economists and environmentalists thus function in the ...
متن کاملMohamed Abbas-08
The accuracy of measuring the crossing moment of a given signal to a specific reference voltage plays a crucial role in determining the bandwidth of the signal that could be converted by a level-crossing ADC. This timing accuracy is mainly determined by delay dispersion of the comparator and the accuracy of the time-to-digital converter (TDC) comprising the levelcrossing ADC. With the pico-seco...
متن کاملA single protein redox ruler.
Redox reactions are the heart of function in biological systems. Using a deceptively simple toolbox, consisting largely of first row transition metals and the 20 canonical amino acids, nature has evolved proteins that contain cofactors with reduction potentials (E°′) between +1 V and −1 V. Chemists have long known that ligands to transition metals markedly alter E°′ of the metal, often in a sys...
متن کاملBeating the odds: a cardiomyocyte cell line at last.
ways and nuclear transcription factors that regulate cardiac myocyte differentiation is a problem that has both fascinated and vexed developmental biologists and cardiologists for more than 20 years. The answer to this puzzle would provide important new information about how disparate signaling pathways evolved to regulate the differentiation of closely related, but distinct, mesodermal cell li...
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ژورنال
عنوان ژورنال: Journal of Association of Arab Universities for Tourism and Hospitality
سال: 2015
ISSN: 1687-1863
DOI: 10.21608/jaauth.2015.67418