منابع مشابه
Large-scale synthesis and characterization of carbon spheres prepared by direct pyrolysis of hydrocarbons
Large-scale production of pure carbon spheres, with diameters from 50 nm to 1 lm, has been achieved via direct pyrolysis of a wide range of hydrocarbons, including styrene, toluene, benzene, hexane, cyclohexane and ethene, in the absence of catalyst. Specific systematic studies using styrene as the feedstock indicate that the sizes of the resulting of carbon nanospheres can be controlled quite ...
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This is a most worth-while volume, that should be read by social workers in particular and humanitarians in general. Within small bulk, it lays bare, without offence to those who are labouring now in this field, the great need of the inhabitants of Common Lodging Houses, to be understood in the first place, and to be given the help they so sorely need, in the second. The survey is well planned,...
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almost 7,500 young people (between the ages of JO and 20) were admitted to mental illness hospitals 'n 1966?the last year for which figures are available. On the face of it the figure may not seem very large when compared with the total population of this age group (6,976,400) but it is a disturbing lumber simply because there are nothing like enough suitable facilities available for the treatm...
متن کاملForgotten Cause of Ear Infection: Forgotten Cotton Buds
The use of cotton buds for actively cleaning of the ears is common despite the old adage ‘do not put anything smaller than your elbow in the ear’. The cotton buds are commonly used to remove the ear wax. The frequently reported complications secondary to cotton bud use include wax impaction, otitis externa and tympanic membrane perforation. Not infrequently, cotton buds can lodge in the ear can...
متن کاملCalcitonin, the forgotten hormone: does it deserve to be forgotten?
Calcitonin is a 32 amino acid hormone secreted by the C-cells of the thyroid gland. Calcitonin has been preserved during the transition from ocean-based life to land dwellers and is phylogenetically older than parathyroid hormone. Calcitonin secretion is stimulated by increases in the serum calcium concentration and calcitonin protects against the development of hypercalcemia. Calcitonin is als...
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ژورنال
عنوان ژورنال: Nature
سال: 2009
ISSN: 0028-0836,1476-4687
DOI: 10.1038/460183a