The phrase "acid fell" is grammatically correct but may not be commonly used in written English without context.
It can be used in scientific or descriptive contexts, particularly when discussing the action of acid dropping or being released.
Example: "As the experiment progressed, the acid fell onto the surface, causing a reaction."
Alternatives: "acid dropped" or "acid descended".
"Acid fell out of favor in the 1980s with the rise of MDMA," he said.
"Acid fell out of favour in the 1980s with the rise of MDMA," he said.
On the other hand, there is one study on ischemia without reperfusion in cats, in which brain ascorbic acid fell markedly over the course of 24 hours after stroke [46].
Subsequently, the sequence structures of the marker proteins with and without the amino acidic substitution were predicted with RaptorX [ 64] and the protein secondary structure in which the changed amino acid fell was identified from the reported structure labelling for the whole sequence as well as from the 3D model for the corresponding domain when possible.
Acid precipitation occurs when sulfur or nitrogen borne on the prevailing winds mixes with atmospheric moisture to form sulfuric or nitric acid, falling earthward as acid rain, snow or fog.
Acid rain is the broad term used to describe several ways that a weak solution of inorganic acids, such as nitric and sulfuric acid, falls out of the atmosphere as rain, snow, mist and fog.
Although fruits make an important contribution to vitamin C (ascorbic acid) intake, the demand for and supply of fresh fruit all year round may lead to the consumption of more unripe fruits containing a variety of organic acids because during ripening, the concentration of acid falls as sugar concentration increases.
Using this approach, humic acid falls on the same overall trend as other low molecular weight organic acids.
However, the concentration of 20 mM fatty acid falls well below the CMC for C9 and near the CMC for C11, while the same concentration falls well above the CMC for C12 (Figure 1).
They found that between 2000 and 2009, levels of four types of trans fatty acids fell by an average of 58%.
Later work in Edgerton's laboratory showed that glycine and gaba, amino acids that inhibit communication between neurons, flood the spinal-cord area after an injury; with repetitive activity on the treadmill, the levels of these amino acids fall.
