Related Experiment Video
Updated: Jul 1, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
Published on: February 5, 2011
Role of the stratospheric polar freezing belt in denitrification
A Tabazadeh1, E J Jensen, O B Toon
1NASA Ames Research Center, Earth Science Division, MS:245-4 Moffett Field, CA 94035, USA. atabazadeh@mail.arc.nasa.gov
Abstract:
Homogeneous freezing of nitric acid hydrate particles can produce a polar freezing belt in either hemisphere that can cause denitrification. Computed denitrification profiles for one Antarctic and two Arctic cold winters are presented. The vertical range over which denitrification occurs is normally quite deep in the Antarctic but limited in the Arctic. A 4 kelvin decrease in the temperature of the Arctic stratosphere due to anthropogenic and/or natural effects can trigger the occurrence of widespread severe denitrification. Ozone loss is amplified in a denitrified stratosphere, so the effects of falling temperatures in promoting denitrification must be considered in assessment studies of ozone recovery trends.
More Related Videos
08:06Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
06:39Isolation and Purification of Bacterial Extracellular Vesicles from Human Feces Using Density Gradient Centrifugation
Published on: September 1, 2023
Related Concept Videos
Phase Transitions: Melting and Freezing
Phase Transitions: Sublimation and Deposition
High-Performance Liquid Chromatography: Elution Process
The Electrical Double Layer
Theories of Dissolution: Diffusion Layer Model
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
Boundary Layer Characteristics