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At a pH of 7, the enzymes that were present from the stomach are no longer active.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 pH 12-13, any ammonium ion in the sample is converted to ammonia gas and is ultimately detected by the electrode.

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 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 present, techniques to establish the realization of an ampere have a relative uncertainty of approximately a few parts in 10 < sup > 7 </ sup >, and involve realizations of the watt, the ohm and the volt.

At the command of Moses he stretched out his rod in order to bring on the first of three plagues ( Exodus 7: 19, 8: 1, 12 ).

At approximately 7: 15 on March 31, 2007 the AMPS / TDMA network ceased to function.

At the same time annual inflation in the economy was variable and during the last five years ( 2003 – 2007 ) has seen a low of 2. 3 % and high of 7. 3 %.

At that time, Sloane's collection consisted of around 71, 000 objects of all kinds including some 40, 000 printed books, 7, 000 manuscripts, extensive natural history specimens including 337 volumes of dried plants, prints and drawings including those by Albrecht Dürer and antiquities from Egypt, Greece, Rome, the Ancient Near and Far East and the Americas.

At that same period it was responsible for 17. 7 percent of goods and services imported by Cyprus.

He uses the Latin " Cogito ergo sum " in the later Principles of Philosophy ( 1644 ), Part 1, article 7: "" At that time, the argument had become popularly known in the English speaking world as " the '' argument ", which is usually shortened to "" when referring to the principle virtually everywhere else.

* 1990 – At Detroit Metropolitan Airport, Northwest Airlines Flight 1482 collides with Northwest Airlines Flight 299 on the runway, killing 7 passengers and 1 crew member aboard flight 1482.

At approximately 7: 40 pm the 727 took off with only Cooper, pilot Scott, flight attendant Mucklow, copilot Rataczak, and flight engineer H. E. Anderson aboard.

At mid-century Dewey believed that progressive education had “ not really penetrated and permeated the foundations of the educational institution .”( Kohn, Schools, 6, 7 ) As the influence of progressive pedagogy grew broader and more diffuse, practitioners began to vary their application of progressive principles.

At each end is a goal 2. 14 m ( 7 feet ) high and 3. 66 m ( 12 ft ) wide measured from the inner sides of the posts and crossbar, and an approximately semi-circular area 14. 63 m ( 16 yd ) from the goal known as the shooting circle ( or D or arc ), bounded by a solid line, with a dotted line 5 m ( 5 yd 6 in — this marking was not established until after metric conversion ) from that, as well as lines across the field 22. 90 m ( 25 yd ) from each end-line ( generally referred to as the 23 m lines ) and in the center of the field.

At the high end of the scale, fingerspelling makes up about 8. 7 % of casual signing in ASL, and 10 % of casual signing in Auslan.

At the July 2008 election the NDC won a comfortable 7 seat majority over the government of former Prime Minister Keith Mitchell.

At Jupiter, the outboard ( 11 m ) set of sensors could measure magnetic field strengths in the range from ± 32 to ± 512 nT, while the inboard ( 6. 7 m ) set was active in the range from ± 512 to ± 16, 384 nT.

At the Professional Developers Conference ( PDC ) 2008, Microsoft also announced Windows Server 2008 R2, as the server variant of Windows 7.

At 3000K, the degree of dissociation is only 7. 85 %:

At 135 for 7 an innings defeat looked almost certain.

At the beginning of the 2012 season Sporting started a perfect 7 – 0 – 0, and with the new addition of players such as Bobby Convey the team has remained on top of the league, setting an MLS record for most minutes played without allowing a shot on goal.

At that time, the army was organised into 11 Border Defence and 4 Security Zones, one regime security brigade, 10 Tank Battalions, 10 Mechanized Infantry Battalions, 18 Infantry Battalions, 6 Commando Battalions, 22 Artillery Battalions, 4 SSM Brigade and 7 Air Defence Artillery Battalions.

At the US Open, Hewitt lost in the quarterfinals to Juan Carlos Ferrero, 6 – 4, 3 – 6, 6 – 7 ( 5 ), 1 – 6.

At the 2006 Legg Mason Tennis Classic in Washington, D. C., Hewitt was defeated by Arnaud Clément, 6 – 7 ( 1 ), 4 – 6, in a quarterfinals, after defeating Vincent Spadea in the second round and Denis Gremelmayr in the third round.

At the 2007 Australian Open, Hewitt lost in the third round to tenth-seeded Chilean and eventual runner-up Fernando González, 2 – 6, 2 – 6, 7 – 5, 4 – 6.

At the end of Infinite Crisis # 7, Luthor oversees Alexander's execution at the hands of the Joker.

" Speaking at the opening of the Michael Reagan Center in Spring, Texas, October 7, 2005, Michael said, " At 8 years old, I thought I was going to hell.