At pH values greater than the pKa of the carboxylic acid group ( mean for the 20 common amino acids is about 2. 2, see the table of amino acid structures above ), the negative carboxylate ion predominates.

At pH values lower than the pKa of the α-ammonium group ( mean for the 20 common α-amino acids is about 9. 4 ), the nitrogen is predominantly protonated as a positively charged α-ammonium group.

At pH values between the two pKa values, the zwitterion predominates, but coexists in dynamic equilibrium with small amounts of net negative and net positive ions.

At a pH below their pI, proteins carry a net positive charge ; above their pI they carry a net negative charge.

At pH 4. 8, the interior of the lysosomes is acidic compared to the slightly alkaline cytosol ( pH 7. 2 ).

At high pH, sarin decomposes rapidly to nontoxic phosphonic acid derivatives.

At 25 ° C, considered the standard temperature, the pH value of a neutral solution is 7. 0.

At the same time, the separating part of the gel also has a pH value in which the buffer ions on average carry a greater charge, causing them to " outrun " the SDS-covered proteins and eliminate the ion gradient and thereby the stacking effect.

At the mean pH of the laryngopharynx ( pH

At high temperatures, the rate of collagen loss will be accelerated and extreme pH can cause collagen swelling and accelerated hydrolysis.

At a pH equal to the protonated base's pKa, the protonated ( ionized ) and unprotonated ( unionized ) forms of the molecule exist in equimolar amounts but only the unprotonated base diffuses readily across cell membranes.

At a lower pH, further chlorination occurs.

At a pH of 7, the enzymes that were present from the stomach are no longer active.

At all pH values other than their isoelectric point, proteins will be charged.

At pH < 5. 89 ( pH < pK < sub > 1 </ sub >) the hydrogen chromate ion is predominant in dilute solution but the dichromate ion is predominant in more concentrated solutions.

At this pH, most toxic metals become insoluble and precipitate, aided by the presence of recycled sludge.

At neutral pH, the dye absorbs red light most strongly and transmits blue light.

At low pH, the dye absorbs ultraviolet and blue light most strongly and appears yellow in solution.

At pH 7, glucose exists in solution in cyclic hemiacetal form as 63. 6 % β-D-glucopyranose and 36. 4 % α-D-glucopyranose, the proportion of linear and furanose form being negligible.

At the neutral pH outside of the cell the E2 envelope protein covers the E1 protein.

At high temperatures, above 24-27 ° C, the solvent melts and the salt dissociates, reversibly reacts with the weak acid and increases the pH.

At the time of the 1789 French Revolution, only half of the French people spoke some French, and 12-13 % spoke it " fairly ", according to Hobsbawm.

At age 12-13 he began to practice heavily.

At any rate, three men out of a six-man B-52 crew are required to copy down Wisman's go-to-war message.

At the heart of all of this was the square, which one such traveler declared to be `` as spacious, as pleasant and aromatick a Market as any in the Universe ''.

At the same time the multiple transvestitism involved -- the fat man as girl and as baby, as coquette pretending to be a baby -- touches for a moment horrifyingly upon the secret sources of a life like Jacoby's, upon the sinister dreams which form the sources of any human life.

At first glance, this hero seems to be more rather than less of an individualist than any of his predecessors.

At any cost, he must leave the dreary Pennsylvania mining town where his father was a pharmacist.

At the same time, it was unlikely that any businessmen would spend a day in a Christian mission out of mere curiosity.

At that time, he afforded me the courtesy of his busy workday for such length as I may need, to speak about my background, my hopes, my views on various national and local topics, and any problems that I may have been vexed with at the time.

At that time consideration will be given to whether in the light of the United States supplies of rice available for Title 1, disposal, India's production, consumption and stocks of food grains, other imports from the United States and countries friendly to the United States, India's storage capacity, and other related factors, any increase would be possible in the portion of the total rice programmed which is currently planned for procurement during the first year.

At any rate, the teacher who recognizes common causes of retardation and maladjustment can frequently do a great deal to eliminate the causes of pupil discouragement, failure, and maladjustment.

At any rate, Manchester did not lag far behind the first commercial system which was set up in 1844 between Baltimore and Washington.

At any rate, the substance of Eichmann's testimony was that all his actions flowed from his membership in the party and the SS, and though the Prosecutor did his utmost to prove actual personal hatred of Jews, his success on this score was doubtful and the anti-Semitic lesson weakened to that extent.

I know Negroes who prefer the South and white Southerners, because `` At least there, you haven't got to play any guessing games ''!!

At any rate, it shows us how immaterial we are.

At, he was tall and " strong enough to intimidate any rival ".

" At his death, Doubleday left many letters and papers, none of which describe baseball, or give any suggestion that he considered himself a prominent person in the evolution of the game.

At first it was employed as a respectful title for any monk, but it was soon restricted by canon law to certain priestly superiors.

At times, Alcott offered his own hand for an offending student to strike, saying that any failing was the teacher's responsibility.

At temperatures near 0 K, nearly all molecular motion ceases and, when entropy = S, ΔS = 0 for any adiabatic process.

At Athens some citizens were far more active than others, but the vast numbers required just for the system to work testify to a breadth of participation among those eligible that greatly surpassed any present day democracy.

At that point, scientists began to reconsider their pre-mission hypothesis that Descartes had been the setting of ancient volcanic activity, as the two astronauts had yet to find any volcanic material.

At above the valley floor, the pair were at the highest elevation above the Lunar Module of any other Apollo mission.

At any rate affairs in that region, including the future of the church of Ephesus ( 20: 28 – 30 ), are treated as though they would specially interest " Theophilus " and his circle ; also an early tradition has Luke die in the adjacent Bithynia.

At the instant of any observation of an object, the apparent position of the object is displaced from its true position by an amount which depends solely upon the transverse component of the velocity of the observer, with respect to the vector of the incoming beam of light ( i. e., the line actually taken by the light on its path to the observer ).

At that meeting, Athanasius was accused of threatening to interfere with the supply of grains from Egypt, and, without any kind of formal trial, was exiled by Constantine to Trier in the Rhineland.

At any rate, he was stopped by these demons and asked, " Who are you?