Zirconium Nickel Hydride is generally immediately available in most volumes. American Elements offers a broad range of products for hydrogen storage research, advanced fuel cells and battery applications. Hydrogen can easily be generated from renewable energy sources and is the most abundant element in the universe. Hydrogen is produced from various sources such as fossil fuels, water and renewables. Hydrogen is nonpolluting and forms water as a harmless byproduct during use. The challenges associated with the use of hydrogen as a form of energy include developing safe, compact, reliable, and cost-effective hydrogen storage and delivery technologies. Currently, hydrogen can be stored in these three forms: Compressed Hydrogen, Liquid Hydrogen and Chemical Storage. High purity, submicron and nanopowder forms may be considered. Hydride compounds are used often used as portable sources of hydrogen gas.American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia)and follows applicable ASTM testing standards.Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.
Zirconium is a Block D, Group 4, Period 5 element. The number of electrons in each of Zirconium's shells is 2, 8, 18, 10, 2 and its electronic configuration is [Kr] 4d2 5s2. In its elemental form zirconium's CAS number is 7440-67-7. The zirconium atom has a radius of 159.pm and it's Van der Waals radius is 200.pm. Zirconium is non-toxic. Zirconium’s principal mineral is zircon (Zirconium Silicate) and is primarily used in its oxide or zirconia form. Zirconium dioxide has a high melting point (2,700° C) and a low thermal conductivity. Its polymorphism, however, restricts its widespread use in ceramic industry. During a heating process, zirconia will undergo a phase transformation process. The change in volume associated with this transformation makes the usage of pure zirconia in many applications impossible. Addition of some oxides, such as CaO, MgO, and Y2O3, into the zirconia structure in a certain degree results in a solid solution, which is a cubic form and has no phase transformation during heating and cooling. This solid solution material is termed as stabilized zirconia, a valuable refractory. Stabilized zirconia is used as a grinding media and engineering ceramics due to its increased hardness and high thermal shock resistivity. Stabilized zirconia is also used in applications such as oxygen sensors and solid oxide fuel cells due to its high oxygen ion conductivity.Zirconium was first discovered by William Gregor in 1791. The name Zirconium originated from the Persian word 'zargun' meaning gold color or gold-like. See Zirconium research below.
Nickel is a Block D, Group 4, Period 4 element. The number of electrons in each of Nickel's shells is 2, 8, 16, 2 and its electronic configuration is [Ar]3d8 4s2. In its elemental form nickel's CAS number is 7440-02-0. Nickel is sometimes found free in nature but is more commonly found in ores. The nickel atom has a radius of 149.pm and it's Van der Waals radius is 163.pm. Nickel and its compounds are considered to be carcinogenic. Nickel carbonyl is a very toxic gas. It is extensively alloyed with iron, chromium, molybdenum, tungsten and other metals produce stainless and other anti-corrosive steel and other corrosion-resistant alloys. It is highly electronically conductive and has many applications as a result. It is the basis of the nickel hydride battery. Most recently, its conductive properties have made it an ideal component for ceramic anode formulations used in oxygen generation and solid oxide fuel cell applications. Catalytic nickel is used to hydrogenate vegetable oils. Nickel additions to glass and ceramic glazes impart a bright green. It is also used in pigments for this purpose. Nickel information, including Technical Data, Safety Data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included. Nickel was first discovered by Alex Constedt in 1751. The name originates from the German word 'kupfernickel' which means false copper from the illusory copper color of the ore. See Nickel research below.
Hydrogen is a Block S, Group 1, Period 1 element. The electronic configuration is 1s1. In its elemental form hydrogen's CAS number is 1333-74-0. The hydrogen atom has a radius of 37.3.pm and it's Van der Waals radius is 120.pm. Hydrogen is highly flammable. Hydrogen was discovered by Sir Henry Cavendish in 1766.
Formula
CAS No.
Appearance
Molecular Weight
ZrNH
Search by Material, Product Name, Product Code, CAS Number, Formula, Element, Anion, Form, EC Number, MDL Number or PubChem ID.
Zirconium arsenate-modified silica nanoparticles for specific capture of phosphopeptides and direct analysis by matrix-assisted laser desorption/ionization mass spectrometry.
Zhao PX, Guo XF, Wang H, Qi CB, Xia HS, Zhang HS.
Anal Bioanal Chem. 2011 Nov 22. [Epub ahead of print]
PMID:
22105300
[PubMed - as supplied by publisher]
A surface derivatization strategy for combinatorial analysis of cell response to mixtures of protein domains.
Chiang C, Karuri SW, Kshatriya PP, Schwartz J, Schwarzbauer JE, Karuri NW.
Langmuir. 2011 Nov 21. [Epub ahead of print]
PMID:
22103809
[PubMed - as supplied by publisher]
Environmentally stable flexible metal-insulator-metal capacitors using zirconium-silicate and hafnium-silicate thin film composite materials as gate dielectrics.
Meena JS, Chu MC, Wu CS, Ravipati S, Ko FH.
J Nanosci Nanotechnol. 2011 Aug;11(8):6858-67.
PMID:
22103091
[PubMed - in process]
Highly sensitive protein kinase activity assay based on electrochemiluminescence nanoprobes.
Zhao Z, Zhou X, Xing D.
Biosens Bioelectron. 2011 Oct 25. [Epub ahead of print]
PMID:
22100765
[PubMed - as supplied by publisher]
Corrosion fatigue behavior of a biocompatible ultrafine-grained niobium alloy in simulated body fluid.
Rubitschek F, Niendorf T, Karaman I, Maier HJ.
J Mech Behav Biomed Mater. 2012 Jan;5(1):181-92. Epub 2011 Sep 8.
PMID:
22100093
[PubMed - in process]
Fabrication and characterization of biocompatible nacre-like structures from ?-zirconium hydrogen phosphate hydrate and chitosan.
Waraich SM, Hering B, Burghard Z, Bill J, Behrens P, Menzel H.
J Colloid Interface Sci. 2011 Oct 29. [Epub ahead of print]
PMID:
22099057
[PubMed - as supplied by publisher]
Wear resistance of experimental titanium alloys for dental applications.
Faria AC, Rodrigues RC, Claro AP, de Mattos Mda G, Ribeiro RF.
J Mech Behav Biomed Mater. 2011 Nov;4(8):1873-9. Epub 2011 Jun 15.
PMID:
22098886
[PubMed - in process]
Carbon Fiber-Reinforced Cyanate Ester/Nano-ZrW(2)O(8) Composites with Tailored Thermal Expansion.
Badrinarayanan P, Rogalski MK, Kessler MR.
ACS Appl Mater Interfaces. 2011 Nov 18. [Epub ahead of print]
PMID:
22098430
[PubMed - as supplied by publisher]
Single-step fabrication of nanolamellar structured oxide ceramic coatings by metal-organic chemical vapor deposition.
Eils NK, Mechnich P, Keune H, Wahl G, Klages CP.
J Nanosci Nanotechnol. 2011 Sep;11(9):8396-402.
PMID:
22097592
[PubMed - in process]
Metalcones: hybrid organic-inorganic films fabricated using atomic and molecular layer deposition techniques.
George SM, Lee BH, Yoon B, Abdulagatov AI, Hall RA.
J Nanosci Nanotechnol. 2011 Sep;11(9):7948-55.
PMID:
22097511
[PubMed - in process]
Reliability and fatigue failure modes of implant-supported aluminum-oxide fixed dental prostheses.
Stappert CF, Baldassarri M, Zhang Y, Hänssler F, Rekow ED, Van P Thompson.
Clin Oral Implants Res. 2011 Sep 5. doi: 10.1111/j.1600-0501.2011.02281.x. [Epub ahead of print]
PMID:
22093019
[PubMed - as supplied by publisher]
Titanium-zirconium alloy narrow-diameter implants (Straumann Roxolid(®) ) for the rehabilitation of horizontally deficient edentulous ridges: prospective study on 18 consecutive patients.
Chiapasco M, Casentini P, Zaniboni M, Corsi E, Anello T.
Clin Oral Implants Res. 2011 Aug 18. doi: 10.1111/j.1600-0501.2011.02296.x. [Epub ahead of print]
PMID:
22092806
[PubMed - as supplied by publisher]
Retention of implant-supported zirconium oxide ceramic restorations using different luting agents.
Nejatidanesh F, Savabi O, Shahtoosi M.
Clin Oral Implants Res. 2011 Nov 14. doi: 10.1111/j.1600-0501.2011.02358.x. [Epub ahead of print]
PMID:
22092303
[PubMed - as supplied by publisher]
Tetra-kis(picolinato-?N,O)zirconium(IV) dihydrate.
Steyn M, Visser HG, Roodt A, Muller TJ.
Acta Crystallogr E Struct Rep Online. 2011 Sep 1;67(Pt 9):m1240-1. Epub 2011 Aug 17.
PMID:
22065566
[PubMed]
2,4-Pentanediolate as an Alkoxide/Diketonate "Hybrid" Ligand and the Formation of Aluminum and Zirconium Derivatives.
Bierschenk EJ, Wilk NR, Hanusa TP.
Inorg Chem. 2011 Nov 4. [Epub ahead of print]
PMID:
22053749
[PubMed - as supplied by publisher]
Ultrasound-assisted synthesis of mesoporous zirconia-hydroxyapatite nanocomposites and their dual surface affinity for Cr3+/Cr2O72- ions.
Achelhi K, Masse S, Laurent GP, Roux C, Laghzizil A, Saoiabi A, Coradin T.
Langmuir. 2011 Nov 4. [Epub ahead of print]
PMID:
22053732
[PubMed - as supplied by publisher]
Synthesis, Characterization, and Materials Chemistry of Group 4 Silylimides.
Cosham SD, Johnson AL, Molloy KC, Kingsley AJ.
Inorg Chem. 2011 Nov 4. [Epub ahead of print]
PMID:
22053704
[PubMed - as supplied by publisher]
Influence of cement thickness on resin-zirconia microtensile bond strength.
Lee TH, Ahn JS, Shim JS, Han CH, Kim SJ.
J Adv Prosthodont. 2011 Sep;3(3):119-25. Epub 2011 Sep 25.
PMID:
22053241
[PubMed]
Reliability of a new biokinetic model of zirconium in internal dosimetry: part ii, parameter sensitivity analysis.
Li WB, Greiter M, Oeh U, Hoeschen C.
Health Phys. 2011 Dec;101(6):677-92.
PMID:
22048486
[PubMed - in process]
Reliability of a new biokinetic model of zirconium in internal dosimetry: part I, parameter uncertainty analysis.
Li WB, Greiter M, Oeh U, Hoeschen C.
Health Phys. 2011 Dec;101(6):660-76.
PMID:
22048485
[PubMed - in process]
Regioselective Cycloaddition of 3-Azetidinones and 3-Oxetanones with Alkynes through Nickel-Catalysed Carbon-Carbon Bond Activation.
Y T Ho K, Aïssa C.
Chemistry. 2012 Feb 22. doi: 10.1002/chem.201200167. [Epub ahead of print]
PMID:
22359347
[PubMed - as supplied by publisher]
The hydrogen evolution reaction in a room temperature ionic liquid: mechanism and electrocatalyst trends.
Meng Y, Aldous L, Belding SR, Compton RG.
Phys Chem Chem Phys. 2012 Feb 22. [Epub ahead of print]
PMID:
22358388
[PubMed - as supplied by publisher]
A cytosolic Ni(II) sensor in a cyanobacterium: Nickel-detection follows nickel-affinity across four families of metal-sensors.
Foster AW, Patterson CJ, Pernil R, Hess CR, Robinson NJ.
J Biol Chem. 2012 Feb 22. [Epub ahead of print]
PMID:
22356910
[PubMed - as supplied by publisher]
Incorporation of metal and color alteration of enamel in the presence of orthodontic appliances.
Gurgel Maia LH, de Lima Filho HL, Araújo MV, de Oliveira Ruellas AC, de Souza Araújo MT.
Angle Orthod. 2012 Feb 23. [Epub ahead of print]
PMID:
22356704
[PubMed - as supplied by publisher]
Nickel(II) and Palladium(II) Thiaethyneporphyrins. Intramolecular Metal(II)-?(2)-CC Interaction inside a Porphyrinoid Frame.
Nojman E, Berlicka A, Szterenberg L, Latos-Grazynski L.
Inorg Chem. 2012 Feb 22. [Epub ahead of print]
PMID:
22356285
[PubMed - as supplied by publisher]
General preparation for Pt-based alloy nanoporous nanoparticles as potential nanocatalysts.
Wang D, Zhao P, Li Y.
Sci Rep. 2011;1:37. Epub 2011 Jul 14.
PMID:
22355556
[PubMed - in process]
Pentacoordinate Ni(II) Complexes: Preparation, Magnetic Measurements, and Ab Initio Calculations of the Magnetic Anisotropy Terms.
Costes JP, Maurice R, Vendier L.
Chemistry. 2012 Feb 22. doi: 10.1002/chem.201103641. [Epub ahead of print]
PMID:
22354459
[PubMed - as supplied by publisher]
[Measurement of carbon dioxide in emergency medicine].
Timmermann A, Brokmann JC, Fitzka R, Nickel EA.
Anaesthesist. 2012 Feb;61(2):148-55. German.
PMID:
22354403
[PubMed - in process]
[Care Counselling - The Client's Expectations.]
Nickel W, Hanns S, Brähler E, Born A.
Gesundheitswesen. 2012 Feb 21. [Epub ahead of print] German.
PMID:
22354362
[PubMed - as supplied by publisher]
Community-based partnered research: new directions in mental health services research.
Alegría M, Wong Y, Mulvaney-Day N, Nillni A, Proctor E, Nickel M, Jones L, Green B, Koegel P, Wright A, Wells KB.
Ethn Dis. 2011 Summer;21(3 Suppl 1):S1-8-16.
PMID:
22352075
[PubMed - in process]
Inverse Suspension Polymerization as a New Tool for the Synthesis of Ion-Imprinted Polymers.
Meouche W, Branger C, Beurroies I, Denoyel R, Margaillan A.
Macromol Rapid Commun. 2012 Feb 21. doi: 10.1002/marc.201200039. [Epub ahead of print]
PMID:
22351426
[PubMed - as supplied by publisher]
Isolation and characterization of Bacillus cereus IST105 from electroplating effluent for detoxification of hexavalent chromium.
Naik UC, Srivastava S, Thakur IS.
Environ Sci Pollut Res Int. 2012 Feb 16. [Epub ahead of print]
PMID:
22351260
[PubMed - as supplied by publisher]
Production of a his-tagged canecystatin in transgenic sugarcane.
Henrique-Silva F, Soares-Costa A.
Methods Mol Biol. 2012;847:437-50.
PMID:
22351027
[PubMed - in process]
Seasonal variation in heavy metal contamination in water and sediments of river Sabarmati and Kharicut canal at Ahmedabad, Gujarat.
Kumar RN, Solanki R, Kumar JI.
Environ Monit Assess. 2012 Feb 21. [Epub ahead of print]
PMID:
22350445
[PubMed - as supplied by publisher]
Dakin-West reaction on 1-thyminyl acetic acid for the synthesis of 1,3-bis(1-thyminyl)-2-propanone, a heteroaromatic compound with nucleopeptide-binding properties.
Roviello GN, Roviello G, Musumeci D, Bucci EM, Pedone C.
Amino Acids. 2012 Feb 15. [Epub ahead of print]
PMID:
22349760
[PubMed - as supplied by publisher]
The chain structure of [Ni(C(4)H(2)O(4))(C(12)H(8)N(2))(H(2)O)](n) with different types of fumarate bridging.
Uhrinová A, Kuchár J, Cernák J.
Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):m92-3. Epub 2012 Jan 7.
PMID:
22346891
[PubMed - in process]
trans-Tetra-aqua-bis-(isonicotinamide-?N)nickel(II) bis-(3-hy-droxy-benzoate) tetra-hydrate.
Zaman IG, Caylak Delibas N, Necefoglu H, Hökelek T.
Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):m200-1. Epub 2012 Jan 21.
PMID:
22346867
[PubMed - in process]
{4,4',6,6'-Tetra-chloro-2,2'-[2,2-dimethyl-propane-1,3-diylbis(nitrilo-methanylyl-idene)]}nickel(II).
Kargar H, Kia R, Abbasian S, Tahir MN.
Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):m193. Epub 2012 Jan 21.
PMID:
22346862
[PubMed - in process]
trans-Tetra-kis(1-allyl-1H-imidazole-?N)bis-(thio-cyanato-?N)nickel(II).
Zheng SM, Jin YL.
Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):m188-9. Epub 2012 Jan 21.
PMID:
22346859
[PubMed - in process]
Poly[aqua-[?(3)-4-carb-oxy-2-(pyridin-4-yl)-1H-imidazole-5-carboxyl-ato-?N,O:N,O:N]nickel(II)].
Jing XM, Gong SZ, Xiao LW.
Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):m187. Epub 2012 Jan 21.
PMID:
22346858
[PubMed - in process]
Recent Research & Development for Hydride
Diazaphospholenes: N-Heterocyclic Phosphines between Molecules and
Lewis Pairs. Gudat D. Acc Chem Res. 2010 Jun 24. [Epub ahead of print] PubMed PMID:
20572668.
Thymidylate Synthase Catalyzed H-Transfers: Two Chapters in
One Tale. Wang Z, Kohen A. J Am Chem Soc. 2010 Jun 24. [Epub ahead of print] PubMed PMID:
20575541.
Cobalt-Mediated Linear 2:1 Co-oligomerization of Alkynes with Enol Ethers to Give
1-Alkoxy-1,3,5-Trienes: A Missing Mode of Reactivity. Lebœuf D, Iannazzo L, Geny A, Malacria M, Vollhardt KP, Aubert C, Gandon V. Chemistry. 2010 Jun 23.
[Epub ahead of print] PubMed PMID: 20575116.
Synthesis and evaluation of silica
hydride-based fluorinated stationary phases. Pesek JJ, Matyska MT, Prajapati KV. J Sep Sci. 2010 Jun 22. [Epub ahead
of print] PubMed PMID: 20572267.
Kinetics of substituted
silylene addition and elimination in silicon nanocluster growth captured by group
additivity. Adamczyk AJ, Reyniers MF, Marin GB, Broadbelt LJ. Chemphyschem. 2010 Jun 21;11(9):1978-94. PubMed PMID: 20549662.
Synthesis of 2-Boryl- and Silylindoles
by Copper-Catalyzed Borylative and Silylative Cyclization of 2-Alkenylaryl
Isocyanides. Tobisu M, Fujihara H, Koh K, Chatani N. J Org Chem. 2010 Jun 17. [Epub ahead of print] PubMed PMID:
20557065.
Thermal Decomposition of Mono- and
Bimetallic Magnesium Amidoborane Complexes. Spielmann J, Piesik DF, Harder S. Chemistry. 2010 Jun 16. [Epub ahead
of print] PubMed PMID: 20564288.
Versatile New C(3)-Symmetric Tripodal Tetraphosphine Ligands; Structural
Flexibility to Stabilize Cu(I) and Rh(I) Species and Tune Their Reactivity. Wassenaar J, Siegler MA, Spek AL, de Bruin B, Reek JN, van der Vlugt JI. Inorg
Chem. 2010 Jun 16. [Epub ahead of print] PubMed PMID: 20552965.
Iron-Catalyzed Hydrogen Production from Formic Acid. Boddien A, Loges B, Ga¨rtner F, Torborg C, Fumino K, Junge H, Ludwig R, Beller
M. J Am Chem Soc. 2010 Jun
15. [Epub ahead of print] PubMed PMID: 20550131.
Intermolecular Dehydrative Coupling Reaction of Arylketones
with Cyclic Alkenes Catalyzed by a Well-Defined Cationic Ruthenium-Hydride
Complex: A Novel Ketone Olefination Method via Vinyl C-H Bond Activation.
Yi CS, Lee DW. Organometallics. 2010 Mar 19;29(8):1883-1885. PubMed PMID: 20567607; PubMed
Central PMCID: PMC2887707.
Proud sponsors of Aeromat 2012. Please join us and our customers & co-sponsors Boeing and ATI on
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Zirconium Nickel Hydride is generally immediately available in most volumes. American Elements offers a broad range of products for hydrogen storage research, advanced fuel cells and battery applications. Hydrogen can easily be generated from renewable energy sources and is the most abundant element in the universe. Hydrogen is produced from various sources such as fossil fuels, water and renewables. Hydrogen is nonpolluting and forms water as a harmless byproduct during use. The challenges associated with the use of hydrogen as a form of energy include developing safe, compact, reliable, and cost-effective hydrogen storage and delivery technologies. Currently, hydrogen can be stored in these three forms: Compressed Hydrogen, Liquid Hydrogen and Chemical Storage. High purity, submicron and nanopowder forms may be considered. Hydride compounds are used often used as portable sources of hydrogen gas.American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia)and follows applicable ASTM testing standards.Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.
Zirconium is a Block D, Group 4, Period 5 element. The number of electrons in each of Zirconium's shells is 2, 8, 18, 10, 2 and its electronic configuration is [Kr] 4d2 5s2. In its elemental form zirconium's CAS number is 7440-67-7. The zirconium atom has a radius of 159.pm and it's Van der Waals radius is 200.pm. Zirconium is non-toxic. Zirconium’s principal mineral is zircon (Zirconium Silicate) and is primarily used in its oxide or zirconia form. Zirconium dioxide has a high melting point (2,700° C) and a low thermal conductivity. Its polymorphism, however, restricts its widespread use in ceramic industry. During a heating process, zirconia will undergo a phase transformation process. The change
in volume associated with this transformation makes the usage of pure zirconia in many applications impossible. Addition of some oxides, such as CaO, MgO, and Y2O3, into the zirconia structure in a 
certain degree results in a solid solution, which is a cubic form and has no phase transformation during heating and cooling. This solid solution material is termed as stabilized zirconia, a valuable refractory. Stabilized zirconia is used as a grinding media and engineering ceramics due to its increased hardness and high thermal shock resistivity. Stabilized zirconia is also used in applications such as oxygen sensors and solid oxide fuel cells due to its high oxygen ion conductivity.Zirconium was first discovered by William Gregor in 1791. The name Zirconium originated from the Persian word 'zargun' meaning gold color or gold-like. See Zirconium research below. 
Nickel is a Block D, Group 4, Period 4 element. The number of electrons in each of Nickel's shells is 2, 8, 16, 2 and its electronic configuration is [Ar]3d8 4s2. In its elemental form nickel's CAS number is 7440-02-0. Nickel is sometimes found free in nature but is more commonly found in ores. The nickel atom has a radius of 149.pm and it's Van der Waals radius is 163.pm. Nickel and its compounds are considered to be carcinogenic. Nickel carbonyl is a very toxic gas. It is extensively alloyed with iron, chromium, molybdenum, tungsten and other metals produce stainless and other anti-corrosive steel and other corrosion-resistant alloys. It is highly electronically conductive and has many applications as a result. It is the basis of the nickel hydride battery. Most recently, its 
conductive properties have 
made it an ideal component for ceramic anode formulations used in oxygen generation and solid oxide fuel cell applications. Catalytic nickel is used to hydrogenate vegetable oils. Nickel additions to glass and ceramic glazes impart a bright green. It is also used in pigments for this purpose. Nickel information, including Technical Data, Safety Data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included. Nickel was first discovered by Alex Constedt in 1751. The name originates from the German word 'kupfernickel' which means false copper from the illusory copper color of the ore. See Nickel research below.
