منابع مشابه
New Ideas About Old Drugs
The nitrovasodilators are a diverse group of pharmacological agents that produce vascular relaxation by releasing nitric oxide. The mechanisms by which these compounds release nitric oxide vary, depending on their chemical structure. Compounds with lower oxidation states of nitrogen such as nitroprusside, nitrosamines, and nitrosothiols release nitric oxide nonenzymatically. In the case of nitr...
متن کاملGesturing gives children new ideas about math.
How does gesturing help children learn? Gesturing might encourage children to extract meaning implicit in their hand movements. If so, children should be sensitive to the particular movements they produce and learn accordingly. Alternatively, all that may matter is that children move their hands. If so, they should learn regardless of which movements they produce. To investigate these alternati...
متن کاملAsthma: new ideas about an old disease.
Asthma is a common and important disease, characterized by widespread bronchial obstruction that is reversible either spontaneously or with therapy. Its principal causes seem to be allergy, infections, irritants, and psychophysiologic reactions, usually in combinations. Induction of asthma by allergens is related to the presence of IgE antibodies fixed to mast cells and basophils. When these an...
متن کاملNew ideas about multiplication of tensorial distributions
There is a huge need in general relativity for a consistent and useful mathematical theory defining the multiplication of tensor distributions in a geometric (diffeomorphism invariant) way. Significant progress has been made through the concept of Colombeau algebras, and the construction of full Colombeau algebras on differential manifolds for arbitrary tensors. Despite the fact that this goal ...
متن کاملNew ideas about aldosterone signaling in epithelia.
The systemic actions of aldosterone are well documented; however, in comparison, our understanding of the cellular and molecular mechanisms by which aldosterone orchestrates these actions is rudimentary. Aldosterone exerts most of its physiological actions by modifying gene expression. It is now apparent that aldosterone represses almost as many genes as it induces. Several aldosterone-sensitiv...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1912
ISSN: 0036-8733
DOI: 10.1038/scientificamerican06291912-586