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Measure of an acid's strength in solution
the value of log Ka is the exponent (−5), giving pKa = 5. For acetic acid, Ka = 1.8 x 10−5, so pKa is 4.7. A lower Ka corresponds to a weaker acid (an
Acid_dissociation_constant
Topics referred to by the same term
Look up PKA or pKa in Wiktionary, the free dictionary. PKA may refer to: Napaskiak Airport (IATA code), airport in Napaskiak, Alaska Professionally known
PKA
Family of enzymes
protein kinase A (PKA) is a family of serine-threonine kinases whose activity is dependent on cellular levels of cyclic AMP (cAMP). PKA is also known as
Protein_kinase_A
protein pKa calculations are used to estimate the pKa values of amino acids as they exist within proteins. These calculations complement the pKa values
Protein_pKa_calculations
Kra–Dai language
Thai, or Central Thai (historically Siamese; Thai: ภาษาไทย), is a Tai language of the Kra–Dai language family spoken by the Central Thai, Mon, Lao Wiang
Thai_language
Atom displaced from its lattice site by an incident particle
In condensed-matter physics, a primary knock-on atom (PKA) is an atom that is displaced from its lattice site by irradiation; it is, by definition, the
PKA_(irradiation)
American martial artist (born 1945)
American superstars of kickboxing, he was the Professional Karate Association (PKA) World Full-Contact Champion, and the Middleweight Kickboxing Champion for
Bill_Wallace_(martial_artist)
Network simulation software
Packet Tracer is a cross-platform visual simulation tool designed by Cisco Systems that allows users to create network topologies and imitate modern computer
Packet_Tracer
American kickboxer (born 1954)
Florida, Wilson lost a 5-round decision to Rudy Burney in a PKA sanctioned match. However, the PKA later overturned the decision for, "improper procedures
Don_Wilson_(kickboxer)
Martial arts promotion company
Professional Karate Association (PKA), later Professional Karate & Kickboxing Association, and now effective from March 1, 2022 PKA Worldwide was originally a
Professional Karate Association
Professional_Karate_Association
Aqueous solution of a weak acid and its conjugate base
value at pH = pKa ± 1, to 10% at pH = pKa ± 1.5 and to 1% at pH = pKa ± 2. For this reason the most useful range is approximately pKa ± 1. When choosing
Buffer_solution
American kickboxer
professional boxer from Memphis, Tennessee. He was a PKA World Super Heavyweight Champion, PKA World Heavyweight champion, Professional Karate Commission
Anthony_Elmore
Governing body for the sports of karate, kickboxing, and mixed martial arts (MMA)
issues that sent the Professional Karate Association (PKA) into decline. From 1974 until 1985, the PKA had been the most recognized worldwide kickboxing sanctioning
ISKA_(sports_governing_body)
American actor and kickboxer
professional kickboxer. He is a former Professional Karate Association (PKA) and Professional Karate Commission (PKC) Light Welterweight World Champion
Jerry_Trimble
Statuary board of the government of Malaysia
Port Klang Authority (PKA) is a government agency of Malaysia that facilitates, regulates and owns the country's most important port, Port Klang, on the
Port_Klang_Authority
Activation of coagulation cascade
surface and reciprocal activation of FXII and PK occurs, forming FXIIa and PKa. FXIIa can initiate the coagulation cascade by cleaving and activating factor
Contact_activation_system
Property of ions and molecules
While pKa values often refer to aqueous solutions, pKa can be defined with reference to any solvent, and many weak organic acids have measured pKa values
Proton_affinity
American martial artist and actor (1944–2012)
win the Professional Karate Association (PKA) Heavyweight full-contact karate title. The original 1974 PKA world champions, including Lewis (heavyweight)
Joe_Lewis_(martial_artist)
American novelist
Virginian. Quine also was the president of the Professional Karate Association (PKA) whose Kick of the 80’s weekly fight series on ESPN ran for close to a decade
Don_Quine
American kickboxer
full contact kickboxer and actor from Rockford, Illinois. He is a former PKA World Heavyweight Champion, ISKA Full Contact Super Heavyweight World Champion
Brad_Hefton
Subdiscipline of chemistry, focusing on carbon compounds
groups have different pKa values and bond strengths (single, double, triple) leading to increased electrophilicity with lower pKa and increased nucleophile
Organic_chemistry
Group of structurally diverse proteins
common function of binding to the regulatory subunit of protein kinase A (PKA) and confining the holoenzyme to discrete locations within the cell. At least
A-kinase-anchoring_protein
Penultimate step in the activation of mammalian spermatozoa
monophosphate (cAMP) synthesis, activating a secondary pathway. Protein kinase A (PKA), which is activated by cAMP, phosphorylates actin polymerization regulators
Capacitation
Chemical compound
buffering agent in biology and biochemistry. It has pKa value of 6.15 at 20 °C. The pH (and pKa at ionic strength I≠0) of the buffer solution changes
MES_(buffer)
Chemical compound
(PKA). H-89, derived from H-8 (N-[2-(methylamino)ethyl]-5-isoquinoline-sulfonamide), was initially believed to act specifically as an inhibitor of PKA
H-89
Catalysis of chemical reactions by enzymes
substantially altered pKa. This alteration of pKa is possible through the local environment of the residue.[citation needed] pKa can also be influenced
Enzyme_catalysis
whose major intracellular receptor is the cAMP-dependent protein kinase (PKA) that acts through the phosphorylation of target proteins. The signal transduction
Crosstalk_(biology)
American kickboxer (born 1959)
He rebounded from this by winning the Professional Karate Association (PKA) World Light Heavyweight title that same year before moving up to cruiserweight
Dennis_Alexio
Chemical compound
(NaOH). The buffering region is dependent upon the pKa, and is typically +/- 1.0 pH units of the pKa. The pKa of KHP is 5.4, so its pH buffering range would
Potassium_hydrogen_phthalate
Middle Indo-Aryan language of India
Developed into Eastern Hindi languages Language family Indo-European Indo-Iranian Indo-Aryan Ardhamagadhi Prakrit Language codes ISO 639-3 pka Glottolog None
Ardhamagadhi_Prakrit
Organic compounds containing amine and carboxylic groups
occurs halfway between the two carboxylate pKa values: pI = 1/2(pKa1 + pKa(R)), where pKa(R) is the side chain pKa. Similar considerations apply to other
Amino_acid
Chemical compound
Pseudomonas hunanensis was found to be able to degrade TRIS buffer. Since Tris' pKa is more strongly temperature dependent, its use is not recommended in biochemical
Tris
Protein-coding gene in the species Homo sapiens
substrates, changing their activity. Protein kinase A catalytic subunit (PKA Cα) is a member of the AGC kinase family (protein kinases A, G, and C), and
PRKACA
American kickboxer, boxer and mixed martial arts fighter (born 1966)
(PKA, IKF, ISKA, FFKA and KICK), and is known for his boxing skills and powerful kicks. Roufus is the Global Director of Fighter Development for PKA Worldwide
Rick_Roufus
Metabolism involving breakdown of lipids
by PKA, it releases CGI-58 and it expedites the docking of phosphorylated lipases to the lipid droplet. CGI-58 can be further phosphorylated by PKA to
Lipolysis
Chemical compound
is most intensively studied. Its protonated derivative CF3C6H4NH+3 has a pKa in acetonitrile of 8.6, about 100x more acidic than aniline. The compound
4-(Trifluoromethyl)aniline
following weight classes: The (now defunct) Professional Karate Association (PKA) utilized the following weight classes: The ONE Championship utilizes the
Kickboxing_weight_classes
Central nervous system stimulant
because Gs-cAMP-PKA signaling functionally inhibits RhoA's downstream activity; once intracellular cAMP sufficiently accumulates, PKA is activated and
Amphetamine
Chemical added to show pH of a solution
states that when pH equals the pKa or pKb value of the indicator, both species are present in a 1:1 ratio. If pH is above the pKa or pKb value, the concentration
PH_indicator
1979 compilation album by various artists
release, the Flesh Eaters consisted solely of their founder, Chris Desjardins (pka Chris D.), backed by the members of the pioneering punk rock band the Flyboys;
Tooth and Nail (various artists album)
Tooth_and_Nail_(various_artists_album)
Chemical compound
corrosive. Peracetic acid is a weaker acid than the parent acetic acid, with a pKa of 8.2. Peracetic acid is produced industrially by the autoxidation of acetaldehyde:
Peracetic_acid
Buffer solution commonly used in biological research
equation gives the pH of a solution relative to the pKa of the acid–base pair. However the pKa is dependent on ionic strength and temperature, and as
Phosphate-buffered_saline
American YouTuber and podcaster (born 1986)
continues to maintain an online presence as the co-host of Painkiller Already (PKA), a podcast he co-founded in 2010. As of April 2025, the FPSRussia channel
FPSRussia
Removal of proton(s) from a molecule in an acid-base reaction
measured by its pKa value. A low pKa value indicates that the compound is acidic and will easily give up its proton to a base. The pKa of a compound is
Deprotonation
Chemical compound
black powder Density 0.7 - 0.8 g/cm3 Solubility in water insoluble Acidity (pKa) 8.5 - 10.0 Except where otherwise noted, data are given for materials in
Bone_char
Organic ring compound (C4H4NH)
H4). Pyrrole is an extremely weak base for an amine, with a conjugate acid pKa of −3.8. The most thermodynamically stable pyrrolium cation (C4H6N+) is formed
Pyrrole
Fungal metabolite
is a potent inhibitor of the serine/threonine kinases protein kinase A (PKA) and protein kinase C (PKC), binding in a similar manner with that of ATP
Balanol
Chemical compound
Self-Consistent Spectrophotometric Basicity Scale in Acetonitrile to a Full Span of 28 pKa Units: Unification of Different Basicity Scales". J. Org. Chem. 70 (3): 1019–1028
1,8-Diazabicyclo(5.4.0)undec-7-ene
1,8-Diazabicyclo(5.4.0)undec-7-ene
Chemical compound
formula [(CH3)3COK]n (abbr. KOtBu). This colourless solid is a strong base (pKa of conjugate acid is 17 in H2O), which is useful in organic synthesis. The
Potassium_tert-butoxide
Pair of structures in the brains of some arthropods and annelids
concentration of cAMP, which activates PKA. When dopamine, an aversive olfactory stimulant, is applied it activates PKA specifically in the vertical mushroom
Mushroom_bodies
Chemical compound
The compound has attracted interest because it (pKa = 9.58) is more basic than dimethylaminopyridine (pKa = 9.41). It is a popular base catalyst. Kaljurand
4-Pyrrolidinylpyridine
Combination of hydrogen and ionic bonding in chemistry
or ammonium group. The midpoint of the titration curve corresponds to the pKa, or the pH where the ratio of protonated: deprotonated molecules is 1:1.
Salt_bridge_(protein)
Effect of spatial atomic arrangement on properties of compounds
acidity of benzoic acid compared to formic acid. The table given below shows pKa values of various monosubstituted benzoic acids. When any group is present
Ortho_effect
Chemical compound
kinase A (PKA) is a group of kinases that are cAMP-dependent that primarily phosphorylate serine or threonine residues in target proteins. PKA is a tetramer
KT5720
Selected 1,10-Phenanthrolines and 2,2'-Bipyridines phen derivative pKa of conjugate acid comment/alt. name numbering scheme 1,10-phenanthroline 4.86 phen
Transition metal complexes of 1,10-phenanthroline
Transition_metal_complexes_of_1,10-phenanthroline
Cellular second messenger
eukaryotes, cyclic AMP works by activating protein kinase A (PKA, or cAMP-dependent protein kinase). PKA is normally inactive as a tetrameric holoenzyme, consisting
Cyclic adenosine monophosphate
Cyclic_adenosine_monophosphate
Aqueous cation H3O+
define pKa of H3O+ in water, H2O has to act simultaneously as a solute and the solvent. The IUPAC has not given an official definition of pKa that would
Hydronium
levels, thereby activating the PKA, by which in turn it is downregulated. In a probably indirect manner via the above PKA regulation, Ras2 has a suppressing
Ras2
American kickboxer
PKA, ISKA and KICK organizations between 1980 and 2003. He was also the STAR undisputed lightweight champion in 1980. He was the first fighter in PKA
Cliff_Thomas_(kickboxer)
Chemical compound
50% water ethanol mixture, the acidity constant (pKa) of Barton's base is 14. In acetonitrile its pKa is 24.31. The base is prepared by the reaction of
2-tert-Butyl-1,1,3,3-tetramethylguanidine
2-tert-Butyl-1,1,3,3-tetramethylguanidine
Chemical compound
species (RNS). It is the conjugate acid of peroxynitrite (ONOO−). It has a pKa of approximately 6.8. It is formed in vivo from the diffusion-controlled
Peroxynitrous_acid
Glycoside
ethanol soluble log P –1.35 Vapor pressure 2.3×10−12 mm Hg (25 °C) Acidity (pKa) 10.10 UV-vis (λmax) 285 nm Pharmacology ATC code D11 (WHO) Routes of administration
Arbutin
Protein-coding gene in the species Homo sapiens
protein kinase A (PKA), which transduces the signal through phosphorylation of different target proteins. The inactive holoenzyme of PKA is a tetramer composed
PRKACB
Signal cascade used for cell to cell communication
protein kinase A (PKA). The PKA enzyme is also known as cAMP-dependent enzyme because it gets activated only if cAMP is present. Once PKA is activated, it
CAMP-dependent_pathway
Anion, salt, functional group or ester derived from a phosphoric acid
two pKa values) the dihydrogen phosphate ion, H2PO4−, is practically the only species present. Around pH 9.8 (mid-way between the second and third pKa values)
Phosphate
American martial artist
Professional Karate Association (PKA) Middleweight U.S. Title in March 1980. McMorris challenged Don "The Dragon" Wilson for the PKA Full-Contact Middleweight
Glenn_McMorris
Organic compounds of the form >C=O
adjacent to the carbonyl in ketones are more acidic (pKa ≈ 20) than the C−H bonds in alkane (pKa ≈ 50). This difference reflects resonance stabilization
Ketone
Ethyl ester of acetoacetic acid
8 °C (357.4 °F; 453.9 K) Solubility in water 2.86 g/100 ml (20 °C) Acidity (pKa) 10.68 (in H2O) 14.2 (in DMSO) Magnetic susceptibility (χ) −71.67×10−6cm3/mol
Ethyl_acetoacetate
Organic compound containing a –C(=O)OH group
give stronger acids (the pKa of acetic acid is 4.76 whereas trifluoroacetic acid, with a trifluoromethyl substituent, has a pKa of 0.23). Electron-donating
Carboxylic_acid
Mammalian protein found in Homo sapiens
cAMP-dependent protein kinase (also called Protein Kinase A or PKA). Cellular effects of Gsα acting through PKA are described here. Although each GTP-bound Gsα can
Gs_alpha_subunit
American kickboxer and martial artist
various kickboxing organizations (NKL, WPKO, Professional Karate Association (PKA), World Kickboxing Association (WKA), AJKBA, Shin-Kakutojutsu Federation
Benny_Urquidez
Full-contact hybrid martial art and combat sport
prominence in September 1974, when the Professional Karate Association (PKA) held the first World Championships. Historically, kickboxing can be considered
Kickboxing
Class of chemical compounds
of their Hammett acidity function values (H0 ≤ −18) and possess computed pKa values well below −20, establishing them as some of the strongest known Brønsted
Carborane_acid
Mammalian protein found in Homo sapiens
stimulant of cAMP production, which leads to activation of protein kinase A. PKA functions to phosphorylate certain proteins, affecting their activity. The
Histamine_H2_receptor
Chemical compound
in alcohol, pyridine, NaOH insoluble in ethyl ether log P −3.14 Acidity (pKa) 8.48 Hazards NFPA 704 (fire diamond) 2 1 0 Lethal dose or concentration
Allantoin
Chemical compound
and ketals from aldehydes and ketones. David A. Evans (2006-11-04). "Evans pKa Table" (PDF). Retrieved 2026-04-23. "Pyridinium p-Toluenesulfonate | TCI
Pyridinium_p-toluenesulfonate
National park in Indonesia
Papagaran Village is similar in size, with 258 families totaling 1,078 people.PKA & TNC 2000, p. 13 At the 2010 Census, Komodo Village had 1,508 inhabitants
Komodo_National_Park
Different forms of a parent chemical species as a function of solution pH
that is, when [AH]/[A−] = 100, pH = pKa − 2 when the acid is 50 % dissociated, that is, when [AH]/[A−] = 1, pH = pKa when the acid is 99 % dissociated,
Ion_speciation
Organic ion with a negatively charged carbon atom
thermodynamically favorable (K > 1), the relationship pKa(BH) > pKa(AH) must hold. These values below are pKa values determined in dimethylsulfoxide (DMSO),
Carbanion
Chemical compound
non-selective phosphodiesterase inhibitor which raises intracellular cAMP, activates PKA, inhibits TNFα and leukotriene synthesis, and reduces inflammation and innate
IBMX
Group of biological receptors
enzyme with a coenzyme. The PKA enzyme also contains two catalytic PKS-Cα subunits, and a regulator PKA-R subunit dimer. The PKA holoenzyme is inactive under
Opioid_receptor
Australian musical group
Daniel Young p.k.a. "Danny Current" on drums, his brother Michael Young p.k.a. "Eddy Current" on lead guitar and keyboard, Brendan Huntley p.k.a. "Brendan
Eddy_Current_Suppression_Ring
Chemical compound
medium and yellow color in basic medium. Because it changes color at the pKa of a mid strength acid, it is usually used in titration of strong acids in
Methyl_orange
Chemical compound
dissociation constant, a measure of basicity) is 11.07 at 25 °C, while its pKa (acid dissociation constant, a measure of acidity) is approximately 37. Many
2,2,6,6-Tetramethylpiperidine
Graph in acid-base chemistry
acid solution. To calculate the logarithmic acid dissociation constant (pKa), one must find the volume at the half-equivalence point, that is where half
Titration_curve
Permanent bond dipole due to electron-rich or -poor groups in a molecule
acidity, they do not by themselves predict all pKa relationships. For example, fluoroacetic acid (pKa ≈ 2.6), which contains a single strongly electron-withdrawing
Inductive_effect
American kickboxer
April 13, 1985 Loss Jerry Rhome PKA The Battle of Atlanta TKO (Right cross) 4 1:19 Atlanta, US Fight was for Rhome's PKA US Heavyweight title. November
Don_Nakaya_Nielsen
Chemical compound
(99 °F; 310 K) at 2.0 kPa Solubility in water miscible log P 1.23 Acidity (pKa) 12.69 Basicity (pKb) 1.31 Refractive index (nD) 1.3870 Thermochemistry Std
Tert-Butyl_hydroperoxide
point 3–7 °C 28–32 °C 61–64 °C Boiling point 195–196 °C 236 °C 235–236 °C pKa 8.42 9.11 9.34 GHS hazard pictograms GHS hazard statements H226, H302, H315
Monobromophenol
Chemical compound giving a proton or accepting an electron pair
constant, pKa is more frequently used, where pKa = −log10 Ka. Stronger acids have a smaller pKa than weaker acids. Experimentally determined pKa at 25 °C
Acid
Chemical compound
g/100 g water (20 °C, pH 7) Solubility product (Ksp) 8.0 × 10−16 Acidity (pKa) 17 Hazards Flash point Non-flammable Related compounds Related compounds
Iron(II)_hydroxide
Organic compound, provitamin
to 120 °C (244 to 248 °F; 391 to 393 K) at 2.7 Pa log P −0.989 Acidity (pKa) 13.033 Basicity (pKb) 0.964 Chiral rotation ([α]D) +29° to +30° Refractive
Panthenol
Chemical compound
[H3P2O7]− + H+, pKa = 0.85 [H3P2O7]− ⇌ [H2P2O7]2− + H+, pKa = 1.96 [H2P2O7]2− ⇌ [HP2O7]3− + H+, pKa = 6.60 [HP2O7]3− ⇌ [P2O7]4− + H+, pKa = 9.41 The pKa's
Pyrophosphoric_acid
Chemical compound
g mol−1 Appearance Colorless gas Melting point −66 °C (−87 °F; 207 K) Acidity (pKa) 14 Basicity (pKb) 15 Hazards Occupational safety and health (OHS/OSH): Main
Monochloramine
Calcium-storing organelle in muscle cells
cyclic AMP pathway) that produces an enzyme called protein kinase A (PKA). PKA can add a phosphate to PLB (this is known as phosphorylation), preventing
Sarcoplasmic_reticulum
Chemical compound
C23H16O6 Molar mass 388.375 g·mol−1 Melting point ≥300 °C log P 6.169 Acidity (pKa) 2.675 Hazards Occupational safety and health (OHS/OSH): Main hazards Causes
Pamoic_acid
Chemical compound (OH–)
ion [HCrO4]− dissociates according to [O3CrO–H]− ⇌ [CrO4]2− + H+ with a pKa of about 5.9. The infrared spectra of compounds containing the OH functional
Hydroxide
Chemical compound
C20H12N3O7SNa Molar mass 461.381 g/mol Appearance dark red/brown powder Acidity (pKa) 6.2, 11.55 Except where otherwise noted, data are given for materials in
Eriochrome_Black_T
Chemical compound
colourless solid with a melting point of 64–66 °C and is moderately acidic (pKa = 2.15). Phenylglyoxylic acid can be synthesized by oxidation of mandelic
Phenylglyoxylic_acid
American biochemist
known for her research on protein kinases, particularly protein kinase A (PKA). She was elected to the Institute of Medicine and the United States National
Susan_S._Taylor
PKA
PKA
PKA
PKA
Boy/Male
Latin
The Lord's.
Boy/Male
Danish, French, German, Indian, Swedish
Kind; Popular
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
God of the World
Surname or Lastname
English
English : possibly a habitational name from Lydden in Kent, named from Old English hlēo ‘shelter’ + denu ‘valley’.
Male
Russian
(Леонтий) Russian form of Latin Leontius, LEONTIY means "lion-like."
Boy/Male
Hindu, Indian, Marathi
Newly Born
Girl/Female
Gujarati, Indian, Kannada
Jwellry; Ornament
Boy/Male
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Punjabi, Sanskrit, Sikh, Sindhi, Telugu, Traditional
Lotus Flower; Awesome
Girl/Female
German American
Temptress'; A rocky cliff on the Rhine river dangerous to boat passage; the Lorelei whose singing...
Boy/Male
Hindu, Indian, Tamil
Lord Shiva
PKA
PKA
PKA
PKA
PKA