The phrase "a test atmosphere" is correct and usable in written English.
It can be used in contexts related to experiments, simulations, or environments designed for testing purposes.
Example: "The researchers created a test atmosphere to evaluate the effects of different variables on plant growth."
Alternatives: "a testing environment" or "an experimental setting".
Teflon filters loaded with 0.7 1.8 mg of DPM were exposed to a test atmosphere of humidified and ozonated air designed to represent realistic ambient air conditions.
NOx was drawn from a gas cylinder (AirGas, National Welders, Morrisville, NC) into the chamber to establish a test atmosphere containing 2 ppm NOx.
In addition, NOx was drawn from a gas cylinder (AirGas National Welders, Morrisville, NC) into the chamber to establish a test atmosphere containing 2 ppm carbon Synthetic Urban Mix and 0.2 ppm NOx.
Our latest development, the CULTEX® RFS module, is characterized by a radial distribution of the test atmosphere from one sampling point to the cells, resulting in a homogeneous deposition of particulate matter on the cells which can be calculated according to a simplified model distinguishing between sedimentation, differentiation and electrical deposition (Fig. S 1 in the ESM).
A limited number of devices favor the exposure of the cultures to an aerosol passing through a box or exposure chamber [ 35, 36], but most of the exposure systems prefer a stream directed towards the cell culture to realize a close contact between the test atmosphere and the cell surface for depositing particles.
In contrast, the CULTEX RFS module is characterized by a central inlet for the test atmosphere into the exposure device, wherefrom the aerosol is distributed into the chambers and the particles deposited on the cell cultures.
The CULTEX glass modules as well as the RFS are designed to establish an incoming flow which is directed immediately via emission ducts to the surface of the cells to guarantee a close contact with the test atmosphere, both qualitatively and quantitatively.
Two module types, based on a linear or radial feed of the test atmosphere to the test system, were used for these studies.
The experimental setup to realize a direct contact between the cells and the test atmosphere differs considerably in the different systems, which are listed in Table 4.
The exposure of cells under conventional submerged conditions, mostly with soluble test substances, shows a variety of shortcomings like the interference of the test atmosphere with medium components, unrealistic exposure conditions including uncertain effective doses for gases and particles.
The exposure can be conducted directly under dynamic conditions, meaning the continuous generation and transport of the test atmosphere to the cells or bacteria, a directed aerosol stream to the surface of the test organisms, a homogeneous exposure as well as a reproducible deposition of particles, and the continuous removal of the atmosphere.
