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21Author    F. Seel, J. SchuhRequires cookie*
 Title    Über die Umsetzung von Kupfersulfat mit Carbonsäuren und Carbonsäurederivaten in wäßrigen Lösungen unter hydrothermalen Bedingungen The Reaction of Copper Sulfate with Carboxylic Acids and their Derivatives in Aqueous Solutions under Hydrothermal Conditions  
 Abstract    Under hydrothermal conditions aqueous solutions of copper(II) sulfate (1) are reduced by means of saturated fatty acids with hydrogen at the a-atom to yield crystalline copper. In all cases carbon dioxide is liberated and lower fatty acids and ketones can be identified as reaction prod-ucts. a-Hydroxy and a-aminocarboxylic acids proved to be very effective reducing agents towards 1. The yield of copper varied from 2 to 2.5 mol Cu per 1 mol of amino acid. The reaction of 1 is suppressed by sulfuric acid. The presence of hydrochlorid acid or chlorides leads to the precipita-tion of copper(I) chloride. The mechanisms of the decomposition of the various types of carboxy-lic acids is discussed. It was also possible to precipitate metallic copper by means of various proteins. 
  Reference    Z. Naturforsch. 42b, 157—162 (1987); eingegangen am 19. September 1986 
  Published    1987 
  Keywords    Copper, Copper(II) Sulfate, Carboxylic Acids, Hydrothermal Reactions 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0157.pdf 
 Identifier    ZNB-1987-42b-0157 
 Volume    42 
22Author    H. Reinecke, L. Dunemann, G. SchwedtRequires cookie*
 Title    Polarographische Untersuchungen zur Bestimmung der Stabilität von Metall-Protein-Bindungen Polarographie Investigations for the Determination of the Stability of Metal-Protein Bonds  
 Abstract    Bonds betw een metals (especially copper) and a protein fraction (18,100 g/m ol) of a soya bean flour extract have been investigated. The binding capacity (304 nmol Cu/mg protein) and the binding stability (K = 1,046 • 103 in an amm onia buffer system) were determined by polarographic investigations. Changes in the polarogram caused by spiking the protein with metal ions were compared with effects in m odel substances. C ysteine, ethylenediam ine, oxalic acid and deriva­ tives o f benzoic acid were used as chelating agents. The effects o f functional groups on the metal-protein bonds were estim ated by the determ ination o f their different binding stabilities. 
  Reference    Z. Naturforsch. 44b, 767 (1989); eingegangen am 3. März 1989 
  Published    1989 
  Keywords    Speciation, Polarography Proteins, Copper, Binding Stability 
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 Identifier    ZNB-1989-44b-0767 
 Volume    44 
23Author    G. Tams, Hk Miiller-BuschbaumRequires cookie*
 Title    A Contribution to the Crystal Chemistry of Alcaline Alealine Earth Precious Metal Perovskites. Synthesis and Crystal Structure of NaBa4Cuo,5Pti,50 8  
 Abstract    Single crystals of the phase NaBa4Cu0 5P t1 s0 8 were prepared in closed silver tubes. The black and moisture sensitive crystals were investigated by four-circle diffractometer X-ray tech­ niques. They show trigonal symmetry, space group D2-P321, a = 10.0644, c = 8.3811 A, Z = 3 and belong to the perovskites. The typical M20 9 double octahedra are occupied by Pt4+ and Cu2+ in a different manner. Na+ is partly in and out of the centres of trigonal prisms of oxygen. These features will be discussed with respect 
  Reference    Z. Naturforsch. 49b, 585—588 (1994); eingegangen am 12. Januar 1994 
  Published    1994 
  Keywords    Sodium, Barium, Copper, Platinum, Crystal Structure 
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 Identifier    ZNB-1994-49b-0585 
 Volume    49 
24Author    C. U., D. Osterloh, Hk Müller-BuschbaumRequires cookie*
 Title    Das erste Oxocuprat/-Arsenat mit Kupfer in gemischter Valenz  
 Abstract    ,56C u o , 4 4) C u (A s 0 4)3 The First O xocuprate/Arsenate Containing Mixed Valent Copper: Cu(Mg2.56Cu0.44)C u(A sO4) 3 Single crystals of Cu(Mg2 56Cu0 44)C u (A s0 4)3 have been prepared by C 0 2-LASER technique and investigated by X-ray diffraction methods. The light blue crystals show monoclinic sym­ metry, space group C2h-C 2/c, a = 11.897, b = 12.855, c -6.688 A, ß = 113.06°, Z = 4. The structure type is characterized by A s 0 4 tetrahedra, dumb-bell-like coordinated Cu(I), twisted C u 0 4 square polygons and octahedra statistically occupied by Mg/Cu2+. 
  Reference    Z. Naturforsch. 49b, 589—592 (1994); eingegangen am 14. Januar 1994 
  Published    1994 
  Keywords    Magnesium, Copper, Arsenic Oxide, Crystal Structure 
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 Identifier    ZNB-1994-49b-0589 
 Volume    49 
25Author    S. Münchau, Hk Müller-BuschbaumRequires cookie*
 Title    Cd0,73 Cu0,27V2 O 6: A Com pound with Brannerite Structure  
 Abstract    Single crystals of Cd() 73Cu<,.27V 20 6 were prepared by solid state reactions. X-ray investiga­ tions lead to monoclinic symmetry, space group C \h-C2lm , a = 9.339, b = 3.5604, c = 6.893 A , ß = 111.85°, Z = 2. It belongs to the Brannerite structure, showing a statistical distribution of Cd2+ and Cu2+ on one point position. The crystal structure of Brannerites is discussed with respect to the distorted O 2-octahedra around V 5+ and the influence of the Jahn-Teller active Cu-+ ion to the shortened M2+Oa octahedra. 
  Reference    Z. Naturforsch. 49b, 927 (1994); eingegangen am 4. März 1994 
  Published    1994 
  Keywords    Cadmium, Copper, Vanadium, Oxide, Brannerite Type 
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 Identifier    ZNB-1994-49b-0927 
 Volume    49 
26Author    F.-D Martin, Hk Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur von NaM g1?64Cu0 ,36^3^10 Synthesis and Crystal Structure of NaM glt64Cuoi36V 3 0 1o  
 Abstract    Single crystals of NaMg] 64Cu().36V 3O 10 have been prepared by heating mixtures of Na2C 0 3, M gC 03, CuO and V 20 5 above the melting point. The yellow crystals show triclinic symmetry, space group Cj-PT, a = 6.726(8), b = 6.743(7), c = 9.625(2) Ä , a = 100.705(9), ß -104.57(1), y = 101.700(9)°, Z = 2. N aM g164Cu0.36V 3O 10 represents a new structure type showing V 3O 10 groups, a statistical distribution of Mg2+ and Cu2+ on two point positions, and N a+ in an irregular coordination. 
  Reference    Z. Naturforsch. 49b, 1329—1333 (1994); eingegangen am 6. Mai 1994 
  Published    1994 
  Keywords    Sodium Magnesium, Copper, Vanadium Oxide, Crystal Structure 
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 Identifier    ZNB-1994-49b-1329 
 Volume    49 
27Author    F.-D Martin, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kenntnis von K4CuV50 15C1 On K4 CuV5 0 1 5 C1  
 Abstract    Single crystals of K4CuV50 15C1 were prepared by crystallization from the melt. The yellow brown crystals show tetragonal symmetry, space group C 4-P 4, a = 8.8690, c = 5.4196 A , Z = 1. K4CuV50 15C1 is strongly related to KBaCuV20 7Cl and K2V 30 8. V (l) shows V 20 7 double tetrahedra connected by square V 0 5 and C u 0 4Cl pyramids. The crystal structure is discussed with respect to the related compounds. 
  Reference    Z. Naturforsch. 49b, 1459—1462 (1994); eingegangen am 9. Juni 1994 
  Published    1994 
  Keywords    Potassium, Copper, Vanadium Oxide-Chloride, Crystal Structure 
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 Identifier    ZNB-1994-49b-1459 
 Volume    49 
28Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Synthesis and Crystal Structure of (Cu,Zn)3 7 5 Mo30 12  
 Abstract    Single crystals of (Cu,Zn)3 75Mo30 12 have been prepared by crystallization from melts and investigated by X-ray diffractometer techniques. (Cu,Zn)3 75Mo3Oi2 crystallizes orthorhom-bically, space group D^-P212,21, Z = 4, a = 17.947(9), b = 5.092(3), c = 10.685(5) A. It is isotypic to Cu385Mo30 12. All molybdenum atoms are tetrahedrally coordinated by oxygen atoms. There are layers of C u 0 6 and Z n 0 6 octahedra, while other metal sites are occupied by copper in a deformed prismatic coordination with one oxygen atom at a remarkably greater distance from copper than the other five. Some of the zinc atoms occupy positions in chains of face-sharing octahedra with an occupancy factor of 0.75. The crystal structure is discussed with respect to the isotypic compound Cu385Mo30 12 and compounds of the type CuLnMo20 8. 
  Reference    Z. Naturforsch. 50b, 247—251 (1995); eingegangen am 13. September 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Molybdenum, Zinc, Oxide 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0247.pdf 
 Identifier    ZNB-1995-50b-0247 
 Volume    50 
29Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Uber das Oxomolybdat AgKCu3Mo4Oi6 mit Silber in siebenfacher Koordination About the Oxomolybdate AgKCu3Mo4O i6 with Silver in Seven-Fold Coordination  
 Abstract    Single crystals of AgKCu3Mo40 16 have been prepared by crystallization from melts and investigated by X-ray diffractometer techniques. This compound crystallizes with monoclinic symmetry, space group C |h-P 2 Je, a = 5.056(1), b = 14.546(4), c = 19.858(9) Ä, ß = 86.64(5)°, Z = 4. The crystal structure of AgKCu3Mo40 16 is closely related to K2Cu3Mo40 16 showing ribbons of edge-sharing C u 0 6 and AgÖ7 polyhedra. The ribbons are linked by tetrahedrally coordinated molybdenum and K2O 10 groups. Another kind of M o 0 4 tetrahedra occupies the cavities inside the ribbons. The crystal structure and the coordination of silver, copper, potas­ sium and molybdenum by oxygen are discussed with respect to K2Cu3Mo40 16. 
  Reference    Z. Naturforsch. 50b, 252—256 (1995); eingegangen am 19. September 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Silver, Molybdenum, Potassium 
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 Identifier    ZNB-1995-50b-0252 
 Volume    50 
30Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kristallchemie eines neuen Oxomolybdats: Cu2YbMo30 12 On the Crystal Chemistry of a New Molybdenum Oxide: Cu2YbM o30 12  
 Abstract    Single crystals of Cu2YbMo30 12 have been prepared by crystallization from melts and investigated by X-ray diffractometer techniques. Cu2YbMo30 12 crystallizes with monoclinic symmetry (space group C 2h -P 12i/m l, a = 5.162(2), b = 10.885(4), c = 8.699(4) A. ß -95.73(7)°, Z = 2), forming a new structure type. Typical features are layers of C u 0 6 octahedra, connected via corners and edges. These layers are linked by molybdenum and ytterbium ions along [001]. The crystal structure as well as the coordination of copper, ytterbium and molybdenum and the oxidation states of copper and molybdenum are discussed with respect to the related but not isotypic compound (Cu,Zn)3 75Mo30 12. 
  Reference    Z. Naturforsch. 50b, 257—260 (1995); eingegangen am 19. September 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Molybdenum, Ytterbium, Oxide 
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 Identifier    ZNB-1995-50b-0257 
 Volume    50 
31Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur eines Oxoantimonats mit Verwandtschaft zum Delafossit-Typ: Cu3MgSbl940 6 Synthesis and Crystal Structure of an Oxoantimonate with Relationship to the Delafossite Type: Cu3MgSbi 40 6  
 Abstract    Single crystals of Cu3MgSb140 6 have been prepared by crystallization from melts and investigated by X-ray diffractometer techniques. Cu^MgSb] 40 6 crystallizes trigonally, space group C 3v — R3/c, a = 5.348(1), c = 34.482(8) A, Z = 6, with a Delafossite related new structure, characterized by layers containing S b 0 6 and M g06 octahedra. These layers are connected by O -C u -O dumb-bells. The crystal structure is discussed with respect to the Delafossite type. 
  Reference    Z. Naturforsch. 50b, 261—264 (1995); eingegangen am 26. September 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Magnesium, Antimony, Oxide 
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 Identifier    ZNB-1995-50b-0261 
 Volume    50 
32Author    JanKarsten Schaefer, BluhmRequires cookie*
 Title    C  
 Abstract    uT m 2[ B 20 5] 2: D as erste "M etaborat" mit einem x [ B 20 5] 4 -Anion CuTm2[B20 5]2: The First " Metaborate" with a ^ [ B ^ s ] 4 -Anion Single crystals o f the compound CuTm2[B 20 3]2 were obtained by a B20 3 flux technique. The compound contains a hitherto unknown metaborate anion with the formula ^ [ ^ O s ] 4-. It crystallizes in the monoclinic space group C|h-P2!/c with a = 452.18(7); b = 720.0(2); c = 929.2(5) pm; ß -90.16(5)°; Z = 2. The metaborate layers consists of four and eight membered rings of edge-sharing B 0 4-tetrahedra resembling the complex anion in the isotypic gadolinite structure of F e Y 2[B eS i0 3]2. The layers are connected via copper-centered elongated oxygen octahedra and slightly distorted thulium-centered tetragonal oxygen antiprisms. 
  Reference    Z. Naturforsch. 50b, 630—634 (1995); eingegangen am 2. August/11. November 1994 
  Published    1995 
  Keywords    Copper, Thulium, Borate, Synthesis, Crystal Structure 
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 Identifier    ZNB-1995-50b-0630 
 Volume    50 
33Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    On the Oxocuprate (C u,C o)375Mo30 12  
 Abstract    Single crystals of (C u,C o)3 7?Mo30 12 have been prepared by recrystallization from melts and investigated by X-ray diffractometer techniques. TTie compound crystallizes with ortho-rhombic symmetry, space group D'2 6 h-P n m a , a = 5.092(1), b = 10.624(3), c = 17.804(4) A, Z = 4 and is isotypic to NaCo2.3iMo30 12. The crystal structure is discussed and it is shown, that the trigonal prismatically coordinated copper positions are occupied in a different m an­ ner. One of the alternate sites is beside the centre of the prisms, and the other one is shifted towards one of the faces of the rectangular prism. This detail may be interpreted by assigning the valance states C u1 and Cu11. The M 0 6 octahedra are occupied statistically by copper and cobalt. 
  Reference    Z. Naturforsch. 50b, 707—711 (1995); eingegangen am 10. O ktober 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Cobalt, Molybdenum, Oxide 
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 Identifier    ZNB-1995-50b-0707 
 Volume    50 
34Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Darstellung und Kristallstruktur eines neuen Kupfer-Antimon-Oxomolybdats: CuSbMo20 8 On the Synthesis and Crystal Structure of a New Copper Antimony Oxomolybdate: CuSbMo20 8  
 Abstract    Single crystals of the hitherto unknown com pound CuSbMo2O s were prepared by recrys­ tallization from melts in closed copper tubes and investigated by X-ray diffractometer techni­ que. CuSbMo^Os crystallizes in a new structure type with monoclinic symmetry, space group q ? h-I 1 2 /a l, a = 5.554(2), b = 4.916(1), c = 21.519(4) Ä, ß = 93.42(3)°, Z = 4. The crystal structure shows Sb111 in a one-sided coordination by four oxygen. Molybdenum shows the rare octahedral coordination by oxygen. M o 0 6 and C u 0 6 octahedra form triple layers stacked and connected by Sb ions along [001], 
  Reference    Z. Naturforsch. 50b, 717—720 (1995); eingegangen am 12. O ktober 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Antimony, Molybdenum, Oxide 
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 Identifier    ZNB-1995-50b-0717 
 Volume    50 
35Author    J. Schaefer, K. BluhmRequires cookie*
 Title    Synthese und Kristallstruktur von CuLn2[B20 5]2 (Ln = Er3*, Lu3+): zwei Kupferlanthanoidborate m it^ [B 20 5 ]4_-A nionen Synthesis and Crystal Structure of CuLn2[B20 5]2 (Ln = E r3+, Lu3+): Two Copper Lanthanoid B orates with 2.[B20 5]4~-Anions  
 Abstract    Single crystals of the new com pounds CuLn2[B20 5]2 (Ln = Er3+(I), Lu3+(II)) were ob­ tained by a B9O 3 flux-technique. They crystallize in the space group C ih -P 2 \lc with I: a = 453.14(6); b = 721.94(5); c = 929.5(4) pm; ß = 90.01(3)°; Z = 2 und II: a = 451.4(4); b = 718.3(1); c = 928.1(3) pm; ß = 90.00(6)°; Z = 2. The compounds are isotypic to CuTm2[B20 5 ] 2 as well as to the mineral Gadolinite (FeY 2 [B eSi0 5 ]2) and exhibit layer like 2.[B20 5]4 --anions consisting of edge sharing B 0 4 -tetrahedra, which form four-and eight-membered rings. The borate anions are separated by layers of elongated C u 0 6-octahedra and slightly distorted tetragonal L n 0 8-antiprisms. 
  Reference    Z. Naturforsch. 50b, 1141—1145 (1995); eingegangen am 19. Januar 1995 
  Published    1995 
  Keywords    Copper, Erbium, Lutetium, Borate, Crystal Structure 
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 Identifier    ZNB-1995-50b-1141 
 Volume    50 
36Author    Sabine Münchau, Karsten BluhmRequires cookie*
 Title    Zur Synthese und Kristallstruktur von Kupfercadmiumpyroboratoxid: Cu2Cd(B20 5) 0 Synthesis and Crystal Structure of Copper Cadmium Pyroborate Oxide: Cu2Cd(B20 5) 0  
 Abstract    Single crystals of the new compound Cu2C d(B20 5) 0 have been prepared by B 20 3/V 20 5 flux technique in a closed silver tube. Their structure is isotypic with Cu2C o(B 20 5) 0 but its preparation is quite different. X-ray investigations on single crystals led to the space group C |h-P 2 !/c (Nr. 14), a = 339.9(2); b = 1509.8(2); c -927,0(1) pm; ß = 93.19(1)°; Z -4. The structure contains isolated B 2O s groups and oxygen that is not coordinated to boron. Cad­ mium is octahedrally coordinated by oxygen, while copper exhibits a nearly square planar or a fivefold pyramidal coordination. 
  Reference    Z. Naturforsch. 50b, 1151 (1995); eingegangen am 19. Januar 1995 
  Published    1995 
  Keywords    Copper, Cadmium, Pyroborate, Oxide, Crystal Structure 
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 Identifier    ZNB-1995-50b-1151 
 Volume    50 
37Author    VerbindungC., S. Münchau, Hk Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur einer mit dem Johillerit verwandten  
 Abstract    Single crystals of C dC u^M gx.5Pbo.5V30 12 have been prepared in closed steel tubes using V 20 5 as a flux. The orange crystals show monoclinic symmetry, space group C2h-C 2 /c , a = 12.417(5), b = 12.983(6), c = 6.911(3) Ä , ß = 113.02(1)°, Z = 4. CdCu1.5Mg1.5PbojV30 12 reveals a relationship to the Johillerite type, but it is characterized by an additional point position for cadmium, situated betw een the square planar C u 0 4 polygons of the Johillerite structure. 
  Reference    Z. Naturforsch. 50b, 1158—1162 (1995); eingegangen am 22. D ezem ber 1994 
  Published    1995 
  Keywords    Cadmium, Copper, Magnesium, Lead, Vanadium, Oxide, Crystal Structure 
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 Identifier    ZNB-1995-50b-1158 
 Volume    50 
38Author    J. Feldmann, Hk Müller-BuschbaumRequires cookie*
 Title    Kristallstrukturuntersuchung an einem bismuthaltigen Hollandit: Crystal Structure Investigation of the Bismuth Containing Hollandite: Bij 9Cu4V40 16  
 Abstract    Single crystals of B^ 9Cu4V 4O i6 have been prepared by quenching of CO2-LA SER heated samples. They were investigated by X-ray techniques. The compound^ crystallizes with tetra­ gonal symmetry, space group C4h-I 4 /w , a = 9.945(2) A, c = 2.915(3) A, Z = 1, and is isotypic to the mineral Hollandite. B^ 9Cu4V4O i6 is the first Hollandite with a statistical distribution of vanadium and copper in the network o f octahedra. Calculations of the Coulomb terms of lattice energy led to a distance o f bismuth to the lone pair of 1.07 A. Considering the lone pair as part of the coordination sphere of Bi3+ a square pyramidal polyhedron is obtained. 
  Reference    Z. Naturforsch. 50b, 1163—1166 (1995); eingegangen am 22. D ezem ber 1994 
  Published    1995 
  Keywords    Bismuth, Copper, Vanadium, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1163.pdf 
 Identifier    ZNB-1995-50b-1163 
 Volume    50 
39Author    Karsten Busche, BluhmRequires cookie*
 Title    Silke  
 Abstract    The compound Cu2 Z n(B 2 0 s) 0 was prepared by using a B 2 0 3 flux technique, and single crystals were investigated by X-ray diffraction (monoclinic symmetry, space group C2 h-P 2 i/c). The structure is isotypic to Cu2 C o(B 2 0 5) 0 with lattice parameters a = 327.38(2), b = 1479.4(3), c = 915.39(13), ß = 95.794(11)°, Z = 4, but with the significant difference that zinc is penta-coordinated by oxygen. Copper exhibits a nearly square planar or a square pyramidal coordi­ nation, respectively. The structure contains isolated B2 0 ? units and oxygen which is not coordinated to boron. Zur Synthese und Kristallstruktur von Kupferzinkpyroboratoxid Cu2Zn(B20 5) 0 
  Reference    Z. Naturforsch. 50b, 1854—1858 (1995); eingegangen am 17. Mai 1995 
  Published    1995 
  Keywords    Copper, Zinc, Pyroborate, Oxide, Crystal Structure 
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 Identifier    ZNB-1995-50b-1854 
 Volume    50 
40Author    D. Frerichs, Hk Müller-BuschbaumRequires cookie*
 Title    Vier verschiedene Koordinationspolyeder um Cu2+ im Oxid-Arsenat-Phosphat Cu0  
 Abstract    (Cu,M g)3(As1_xPJt:0 4)2 (x = 0,3) Four Different Coordination Polyhedra Around Copper in the Oxide-Arsenate-Phosphate C u0(C u,M g)3(A s,_xP,.04)2 (x = 0.3) Single crystals of CuO(Cu,Mg)3[(As0.7P0.3)O4]2 have been prepared by crystallization from melts. The compound crystallizes with triclinic symmetry, space group C '-P l, a = 6.372(4), b = 7.643(7), c = 8.175(5) A, a = 98.59(6), ß = 112.26(3), 7 = 99.03(3)°, Z = 2. CuO(Cu,Mg)3[(Aso)7Po 3)0 4]2 is isotypic to Cu4(P 0 4)20 . X-ray investigations show square planar C u 04 polygons, twisted tetragonal C u 0 5 pyramids, C u 05 bipyramids and elongated (Cu,M g)06 octahedra. 
  Reference    (Z. Naturforsch. 51b, 25—28 [1996]; eingegangen am 27. Juli 1995) 
  Published    1996 
  Keywords    Copper, Magnesium, Arsenate, Phosphate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0025.pdf 
 Identifier    ZNB-1996-51b-0025 
 Volume    51 
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