Logo
 
Reference terms from Wikipedia, the free encyclopedia
 

Swan neck flask

A swan neck flask, also known as a gooseneck flask, is a flask with a particular shape of tube leading into it. A test tube or other vessel may also have a "swan neck". The swan neck significantly slows down the motion of air through the tube, and particles in the air, such as bacteria, become trapped on moisture on its inner surfaces. As a result, sterile liquid in the vessel itself remains sterile as long as the liquid does not contact the contaminated liquid in the tube. Louis Pasteur developed and used this apparatus in 1859 to prove that particles in the air (germ theory), rather than the air itself (spontaneous generation), led to fermentation.

 
Note:   The above text is excerpted from the Wikipedia article Swan neck flask, which has been released under the GNU Free Documentation License.
 

Check out these latest Nanowerk News:

 

Researchers develop a new predictive model for designing 2D perovskites

By separating dielectric-screening effects from structural distortion, the study offers practical design rules for tuning excitons in 2D perovskites.

Orbitronics breakthrough points to low-power memory

Researchers directly used orbital currents in a magnetic device, producing much stronger signals for future low-energy memory and processors.

Microscopy at the space-time limit

Ultrafast scanning tunneling microscopy reaches the quantum mechanical space-time limit for the first time.

Programmable molecular machines are getting closer

Researchers created a highly stable electrically controlled DNA origami switch that regulates molecular functions and keeps working through hundreds of thousands of cycles.

Nanozyme tags reveal where nanoparticles go in cells

A new nanozyme labeling method maps nanoparticle interactions in living cells, showing how targeting alters trafficking and could guide better nanomedicines.

Light-written magnetic memory moves closer

Researchers used laser pulses to write and read antiferromagnetic data, opening a path to faster, lower-energy memory linked to optical networks.

Laser-controlled molecules reveal hidden reaction dynamics

Synchronized infrared lasers steer molecules between structures, exposing clear spectral fingerprints and new ways to study chemical reactions.

MOF thin films reveal a denser, less porous structure than expected

Advanced diffraction and modeling show a widely studied MOF thin film is densely packed, reshaping expectations for sensors, microelectronics and magnetic storage.

Atomic-scale insights clarify hidden defect signals in carbon materials

New analysis links long-ambiguous carbon defect peaks to specific atomic structures, helping improve material design for energy and electronics.

Room-temperature photon source brings quantum security closer to deployment

A compact plug-and-play device produces single photons without cryogenic cooling, easing integration with quantum-secure communication networks.