A barrier to diffusion
نویسندگان
چکیده
منابع مشابه
Airway liquid: a barrier to drug diffusion?
Correspondence: J.G. Widdicombe, Sherrington School of Physiology, St Thomas' Hospital Campus (UMDS), Lambeth Palace Road, London SE1 7EH, UK. The paper by HOHLFELD et al. [1] in this issue shows that, in rats, bronchoconstriction due to inhaled acetylcholine is inhibited by inhaled aerosols of surfactant. Bronchoconstriction was assessed from changes in total lung resistance; other parameters ...
متن کاملBrain extracellular space as a diffusion barrier
The extracellular space (ECS) consists of the narrow channels between brain cells together with their geometrical configuration and contents. Despite being only 20-60 nm in width, the ECS typically occupies 20% of the brain volume. Numerous experiments over the last 50 years have established that molecules moving through the ECS obey the laws of diffusion but with an effective diffusion coeffic...
متن کاملPerpetual barrier options in jump-diffusion models∗
We present a closed form solution to the perpetual American double barrier call option problem in a model driven by a Brownian motion and a compound Poisson process with exponential jumps. The method of proof is based on reducing the initial irregular optimal stopping problem to an integro-differential free-boundary problem and solving the latter by using continuous and smooth fit. The obtained...
متن کاملPatient Favoritism as a Barrier to Justice in Health Care: A Qualitative Study
Background and Objectives: Justice is one of the basic principles of medical ethics which indicates rightful, fair, impartial, and equitable care. The present study aimed to introduce patient favoritism, a phenomenon that undermines justice. Methods: The present qualitative study was conducted based on some data derived from another qualitative study titled “Investigating the process of achiev...
متن کاملModeling Diffusion of an Alkaline Plume in a Clay Barrier
The design of clay plugs used for sealing access galleries to a radioactive waste repository built with concrete structures in a deep clayey formation must take into consideration their chemical evolution over time. Diffusion of an alkaline plume from concrete into bentonite was therefore modeled over a 100,000-year period with the PHREEQC geochemical code in order to determine, as a function o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature Reviews Neuroscience
سال: 2006
ISSN: 1471-003X,1471-0048
DOI: 10.1038/nrn1831