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Back pressure is the term used for the hydraulic pressure required to create a flow through a chromatography column in high-performance liquid chromatography, the term deriving from the fact that it is generated by the resistance of the column, and exerts its influence backwards on the pump that must supply the flow.
Backflow occurs for one of two reasons, either back pressure or back siphonage. [1] Back pressure is the result of a higher pressure in the system than in its supply, i.e. the system pressure has been increased by some means. This may occur in unvented heating systems, where thermal expansion increases the pressure. Back siphonage is the result ...
“A common myth is that you will not develop high blood pressure if you do not have a family history of high blood pressure or heart disease,” says Marjorie Nolan Cohn, M.S., RD, LDN, a ...
Since it was originally proposed, the hypothesis has been challenged, [9] and it has been described as a "myth". [ 8 ] [ 10 ] Detractors argue that the hypothesis is inconsistent with historical evidence regarding salt deficiency in Africa or the causes of death aboard slave ships. [ 11 ]
The real story behind the 10,000 step number is a little wilder and less science-forward than you might think. In this feature, Women's Health investigates.
That creates a pressure canister in our trunk that stabilizes the spine. The bottom of that pressure canister is the pelvic floor. So, if that's unable to do its job, it can lead to back pain.
The pressure is also affected over a wide area, in a pattern of non-uniform pressure called a pressure field. When an airfoil produces lift, there is a diffuse region of low pressure above the airfoil, and usually a diffuse region of high pressure below, as illustrated by the isobars (curves of constant pressure) in the drawing.
A Harvard medical student and researcher, Nick Norwitz, recently released a video in which he debunked eight myths surrounding the carnivore diet. (See the video at the top of this article.)