منابع مشابه
Botanical ratchets.
Ratcheting surfaces are a common motif in nature and appear in plant awns and grasses. They are known to proffer selective advantages for seed dispersion and burial. In two simple model experiments, we show that these anisotropically toothed surfaces naturally serve as motion rectifiers and generically move in a unidirectional manner, when subjected to temporally and spatially symmetric excitat...
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Supplementary data tml http://rspb.royalsocietypublishing.org/content/suppl/2009/03/06/rspb.2008.1685.DC1.h "Data Supplement" References http://rspb.royalsocietypublishing.org/content/276/1665/2243.full.html#ref-list-1 This article cites 15 articles, 2 of which can be accessed free Subject collections (129 articles) biophysics (54 articles) biomaterials Articles on similar topics can be f...
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Drugs used to treat anxiety have many negative side effects including addiction, depression, suicide, seizures, sexual dysfunction, headaches and more. Anxiolytic medications do not restore normal levels of neurotransmitters but instead manipulate the brain chemistry. For example, selective serotonin reuptake inhibitors (SSRIs) prevent the reuptake of serotonin from the synapse allowing seroton...
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Because botanical taxonomies are prototypical classifications it would seem that it should be easy to formalize them as concept lattices or type hierarchies. On closer inspection, however, one discovers that such a formalization is quite challenging to obtain. First, botanical taxonomies consist of several interrelated hierarchies, such as a specimen-based plant typology, a name hierarchy and a...
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H emorrhoids are a very common condition. Hospitalbased proctoscopy studies show prevalence rates of hemorrhoids in up to 86 percent of patients studied with many in an asymptomatic state. Botanicals used internally and topically can treat early stages of hemorrhoids effectively and can be used as adjuncts in more advanced stages when surgical treatments may be necessary. The roles of butcher’s...
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ژورنال
عنوان ژورنال: Nature
سال: 1985
ISSN: 0028-0836,1476-4687
DOI: 10.1038/318123a0