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Incubate at 23 °C (73 °F) for 20 minutes; Centrifuge for 20 minutes at 16,000 G at 23 °C (73 °F) Invert filter and spin for 3 minutes at 2000 G; Bring the sample back to a neutral pH with 15-2uL 2.5M Tris pH9; Add ELISA buffer (1.5% BSA and 0.05% Tween 20 in phosphate buffered saline) Perform ELISA analysis.
The biochemistry of Alzheimer's disease, the most common cause of dementia, is not yet very well understood. Alzheimer's disease (AD) has been identified as a proteopathy : a protein misfolding disease due to the accumulation of abnormally folded amyloid beta (Aβ) protein in the brain . [ 1 ]
In organic synthesis, PPTS is used as a weakly acidic catalyst, providing an organic soluble source of pyridinium (C 5 H 5 NH +) ions.For example, PPTS is used to deprotect silyl ethers or tetrahydropyranyl ethers when a substrate is unstable to stronger acid catalysts.
In cell biology, protein kinase A (PKA) is a family of serine-threonine kinase [1] whose activity is dependent on cellular levels of cyclic AMP (cAMP). PKA is also known as cAMP-dependent protein kinase (EC 2.7.11.11). PKA has several functions in the cell, including regulation of glycogen, sugar, and lipid metabolism.
The normal function of Aβ is not yet known. [9] Though some animal studies have shown that the absence of Aβ does not lead to any obvious loss of physiological function, [10] [11] several potential activities have been discovered for Aβ, including activation of kinase enzymes, [12] [13] protection against oxidative stress, [14] [15] regulation of cholesterol transport, [16] [17] functioning ...
From the titration of protonatable group, one can read the so-called pK a 1 ⁄ 2 which is equal to the pH value where the group is half-protonated (i.e. when 50% such groups would be protonated). The p K a 1 ⁄ 2 is equal to the Henderson–Hasselbalch p K a (p K HH
It also acts on the brain's cholinergic system; [4] Amyloid β containing pyroglutamic acid is increased in Alzheimer's disease; this may be part of the disease process. [5] Increased levels of pyroglutamic acid in the blood, leading to excess in the urine ( 5-oxoprolinuria ), can occur following paracetamol overdose , as well as in certain ...
Thioflavin S binds both senile plaques (SP) and neurofibrillary tangles (NFT), the two characteristic cortical lesions of Alzheimer's. Amyloid beta is a peptide derived from the amyloid precursor protein which is only found in senile plaques, and so only plaques are visible in the right hand image.
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