Eric Matthew Villa, PhD

Professor

photo placeholder for Villa, Eric Matthew

Contact

College of Arts and Sciences
Chemistry
Biochemistry
Chemistry Faculty
RGSB - Rigge Science Building - 233

Eric Matthew Villa, PhD

Professor

Research Focus

One of our primary interests is in the synthesis, characterization and reaction dynamics of polyoxometalate ions (POMs) in water, which includes the relationship between the solid-state and solution properties of POMs and isotopic-oxygen-exchange reactions of POMs in water. We are also interested in the synthesis and characterization of lanthanide materials. Here we explore periodic trends within lanthanide compounds and the structure-function relationships & utilization of solid-state properties of these materials.

Department

Chemistry and Biochemistry

Position

Professor

Publications

  • Crystals (Basel)
    Spriet Matthieu R., Villa Eric M., Polinski Matthew J., Mercado Brandon Q., Synthesis and Structures of the Capped and Sandwiched Cobalt Heptamolybdate Polyoxometalate (NH4)(6){[Co(H2O)(5)][Mo7O24][Co(H2O)(2)][Mo7O24][Co(H2O)(5)]} center dot 6 H2O and Its Extended Structure (NH4)(6){[Co(H2O)(2)](3)[Mo7O24](2)}
    12:9 2022
  • Medicinal Chemistry Research
    Lejcher Connor A., Villa Eric M., Fletcher James T., Merging antimicrobial and visible emission properties within 1,3,4-trisubstituted-1,2,3-triazolium salts
    31:3, p. 474 - 484 2022
  • Polyhedron
    Reedy Colin N., Villa Eric M., Stabilizing lanthanide periodate compounds by slowing periodate reduction at elevated temperatures with NaBiO3, a sacrificial oxidant
    203 2021
  • Crystal Growth and Design
    Dalton Evan Z., Blomberg Wilson R., Villa Eric M., Syntheses and Structures of the First Lanthanide-Thiosulfate Complexes and the Subsequent Formation of Mixed Thiosulfate-Sulfite Compounds
    21:5, p. 3071 - 3081 2021
  • Inorganic Chemistry
    Brenner Natasha, Villa Eric M., Albrecht-Schmitt Thomas E., Polinski Matthew J., Celis-Barros Cristian, Sperling Joseph M., Poe Todd N., Brittain Kristi, Trivalent f-Element Squarates, Squarate-Oxalates, and Cationic Materials, and the Determination of the Nine-Coordinate Ionic Radius of Cf(III)
    59:13, p. 9384 - 9395 2020
  • Polyhedron
    Kreofsky Nicholas W., Dillenburg Maxwell D., Villa Eric M., Fletcher James T., Ru(II) coordination compounds of N[sbnd]N bidentate chelators with 1,2,3 triazole and isoquinoline subunits
    177 2020
  • Journal of chemical education
    Worley Bob, Villa Eric, Gunn Jess M., Mattson Bruce M., Visualizing Dissolution, Ion Mobility, and Precipitation through a Low-Cost, Rapid-Reaction Activity Introducing Microscale Precipitation Chemistry
    96:5, p. 951 - 954 2019
  • Zeitschrift fur Anorganische und Allgemeine Chemie
    Dovgan Jakob T., Polinski Matthew J., Villa Eric M., Synthesis, Characterization, and Structural Comparisons of the First Neodymium(III) Sulfite-Acetate Crystal Structure
    645:1, p. 31 - 35 2019
  • Minerals
    Villa Eric M., Cross Justin N., Albrecht-Schmitt Thomas E., New uranyl open framework and sheet compounds formed via in-situ protonation of piperazine by phosphorous acid
    8:11 2018
  • Crystal Growth and Design
    Dovgan Jakob T., Polinski Matthew J., Mercado Brandon Q., Villa Eric M., PH Driven Hydrothermal Syntheses of Neodymium Sulfites and Mixed Sulfate-Sulfites
    18:9, p. 5332 - 5341 2018
  • Beilstein Journal of Organic Chemistry
    Fletcher James T., Villa Eric M., Hanson Matthew D., Christensen Joseph A., Revisiting ring-degenerate rearrangements of 1-substituted-4-imino-1,2,3-triazoles
    14, p. 2098 - 2105 2018
  • Inorganic Chemistry
    Poe Todd N., Villa Eric M., Polinski Matthew J., White Frankie D., Proust Vanessa, [Ag2M(Te2O5)2]SO4 (M = CeIV or ThIV)
    57:9, p. 4816 - 4819 2018
  • Tetrahedron Letters
    Fletcher James T., Villa Eric M., Christensen Joseph A., Tandem synthesis of 1-formyl-1,2,3-triazoles
    58:47, p. 4450 - 4454 2017
  • Acta Crystallographica Section E Crystallographic Communications
    Byer Stefano H., Villa Eric M., Synthesis and crystal structure of cerium(IV) bis(phosphite)
    73:9, p. 1290 - 1293 2017
  • Acta Crystallographica Section E-Crystallographic Communications
    Byer Stefano H., Villa Eric Matthew, Synthesis and Crystal Structure of Cerium(IV) Bis(Phosphite)
    73, p. 1290 - + 2017
  • Tetrahedron Letters
    Pandya Amit N., Villa Eric Matthew, North E. Jeffrey, A Simple and Efficient Approach for the Synthesis of 2-Aminated Quinazoline Derivatives Via Metal Free Oxidative Annulation
    58:13, p. 1276 - 1279 2017
  • Acta Crystallographica Section E Crystallographic Communications
    Smith Robert W., Villa Eric M., Holman Darien, Crystal Structure of Li3Ga(BO3)2
    73:3, p. 456 - 458 2017
  • Acta Crystallographica.Section E, Crystallographic Communications
    Smith R. W., Holman D., Villa Eric M., Crystal Structure of Li3Ga(BO3)2
    73:Part 3, p. 456 - 458 2017
  • Tetrahedron
    Gubbels Matthew A., Hulce Martin R., Kum John M., Urick Andrew K., Villa Eric M., Stereoselective Synthesis of Exocyclic Allenes by Double Hydride Reduction of 3-Alkynyl-2-Cycloalkenones
    72:40, p. 6052 - 6063 2016
  • ChemInform
    Pandya Amit N., Fletcher James T., Villa Eric M., Agrawal Devendra K., Silver-Mediated Synthesis of Indolizines via Oxidative C-H functionalization and 5- endo-dig cyclization
    46:18, p. no - no 2015
  • Tetrahedron Letters
    Pandya Amit N., Agrawal Devendra K., Fletcher James T., Villa Eric M., Silver-Mediated Synthesis of Indolizines via Oxidative C-H functionalization and 5- endo-dig cyclization
    55:50, p. 6922 - 6924 2014
  • ChemInform
    Yu Na, Alekseev Evgeny V., Suleimanov Evgeny V., Depmeier Wulf, Klepov Vladislav V., Villa Eric M., Bosbach Dirk, Albrecht-Schmitt Thomas E., ChemInform Abstract: Topologically Identical, but Geometrically Isomeric Layers in Hydrous α-, β-Rb[UO2(AsO3OH)(AsO2 (OH)2)]·H2O and Anhydrous Rb[UO2(AsO3OH)(AsO2(OH)2)]
    45:31, p. no - no 2014
  • Inorganic Chemistry
    Cross Justin N., Tan Xiaoyan, Kikugawa Naoki, Shatruk Michael, Baumbach Ryan, Darling Victoria R., Polinski Matthew J., Lin Jian, Albrecht-Schmitt Thomas E., Villa Eric M., Straightforward Reductive Routes to Air-Stable Uranium(III) and Neptunium(III) Materials
    53:14, p. 7455 - 7466 2014
  • Journal of Solid State Chemistry
    Yu Na, Depmeier Wulf, Klepov Vladislav V., Villa Eric M., Bosbach Dirk, Suleimanov Evgeny V., Albrecht-Schmitt Thomas E., Alekseev Evgeny V., Topologically identical, but geometrically isomeric layers in hydrous α-, β-Rb[UO2(AsO3OH)(AsO2(OH)2)]·H2O and anhydrous Rb[UO2(AsO3OH)(AsO2(OH)2)]
    215, p. 152 - 159 2014
  • Coordination Chemistry Reviews
    Polinski Matthew J., Villa Eric M., Albrecht-Schmitt Thomas E., Oxoanion systems containing trivalent actinides
    266-267:1, p. 16 - 27 2014
  • ChemInform
    Polinski Matthew J., Alekseev Evgeny V., Albrecht-Schmitt Thomas E., Depmeier Wulf, Cross Justin N., Villa Eric M., Lin Jian, ChemInform Abstract: Synthesis of Divalent Europium Borate via in situ Reductive Techniques
    44:38, p. no - no 2013
  • ChemInform
    Babo Jean-Marie, Jouffret Laurent, Lin Jian, Villa Eric M., Albrecht-Schmitt Thomas E., ChemInform Abstract: Synthesis, Structure, and Spectroscopy of Two Ternary Uranium(IV) Thiophosphates: UP2S9 and UP2S7 Containing P2S92- and P2S72- Ligands
    44:35, p. no - no 2013
  • Inorganic Chemistry
    Polinski Matthew J., Lin Jian, Cross Justin N., Villa Eric M., Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., Synthesis of divalent europium borate via in situ reductive techniques
    52:14, p. 8099 - 8105 2013
  • Dalton Transactions
    Villa Eric M., Diwu Juan, Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., Structural changes within the alkaline earth uranyl phosphites
    42:26, p. 9637 - 9644 2013
  • Inorganic Chemistry
    Babo Jean Marie, Jouffret Laurent, Lin Jian, Villa Eric M., Albrecht-Schmitt Thomas E., Synthesis, structure, and spectroscopy of two ternary uranium(IV) thiophosphates
    52:13, p. 7747 - 7751 2013
  • ChemInform
    Villa Eric M., Diwu Juan, Alekseev Evgeny V., Depmeier Wulf, Marr Connor J., Albrecht-Schmitt Thomas E., ChemInform Abstract: From Order to Disorder and Back Again: In situ Hydrothermal Redox Reactions of Uranium Phosphites and Phosphates
    44:15, p. no - no 2013
  • Crystal Growth and Design
    Villa Eric M., Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., Syntheses, structures, and comparisons of thallium uranium phosphites, mixed phosphate-phosphites, and phosphate
    13:4, p. 1721 - 1729 2013
  • Journal of the American Chemical Society
    Cross Justin N., Alekseev Evgeny V., Duncan Patrick M., Villa Eric M., Polinski Matthew J., Babo Jean Marie, Booth Corwin H., Albrecht-Schmitt Thomas E., From yellow to black
    135:7, p. 2769 - 2775 2013
  • ChemInform
    Lin Jian, Villa Eric M., Albrecht-Schmitt Thomas E., Cross Justin N., Diwu Juan, Polinski Matthew J., ChemInform Abstract: Unusual Coordination for Plutonium(IV), Cerium(IV), and Zirconium(IV) in the Cationic Layered Materials [M2Te4O11]X2 (M: Pu, Ce, Zr; X: Cl, Br)
    44:8, p. no - no 2013
  • Inorganic Chemistry
    Villa Eric M., Diwu Juan, Marr Connor J., Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., From order to disorder and back again
    52:2, p. 965 - 973 2013
  • Crystal Growth and Design
    Meredith Nathan A., Polinski Matthew J., Cross Justin N., Villa Eric M., Albrecht-Schmitt Thomas E., Simonetti Antonio, Synthetic influences on neptunium incorporation in naturally occurring copper uranyl phosphates
    13:1, p. 386 - 392 2013
  • ChemInform
    Lin Jian, Diwu Juan, Cross Justin N., Villa Eric M., Albrecht-Schmitt Thomas E., ChemInform Abstract: Cerium(IV) Tellurite Halides [Ce2Te7O17]X2 (X: Cl- or Br-): The First Cerium-Containing Cationic Frameworks
    43:50, p. no - no 2012
  • ChemInform
    Polinski Matthew J., Cross Justin N., Grant Daniel J., Wang Shuao, Alekseev Evgeny V., Villa Eric M., Depmeier Wulf, Gagliardi Laura, Albrecht-Schmitt Thomas E., ChemInform Abstract: Differentiating Between Trivalent Lanthanides and Actinides
    43:47, p. no - no 2012
  • Inorganic Chemistry
    Lin Jian, Albrecht-Schmitt Thomas E., Cross Justin N., Diwu Juan, Polinski Matthew J., Villa Eric M., Unusual coordination for plutonium(IV), cerium(IV), and zirconium(IV) in the cationic layered materials [M 2Te 4O 11]X 2 (M = Pu, Ce, Zr; X = Cl, Br)
    51:21, p. 11949 - 11954 2012
  • ChemInform
    Cross Justin N., Villa Eric M., Wang Shuao, Diwu Juan, Polinski Matthew J., Albrecht-Schmitt Thomas E., ChemInform Abstract: Syntheses, Structures, and Spectroscopic Properties of Plutonium and Americium Phosphites and the Redetermination of the Ionic Radii of Pu(III) and Am(III)
    43:43, p. no - no 2012
  • Inorganic Chemistry
    Lin Jian, Diwu Juan, Cross Justin N., Villa Eric M., Albrecht-Schmitt Thomas E., Cerium(IV) tellurite halides [Ce 2Te 7O 17]X 2 (X = Cl - or Br -)
    51:19, p. 10083 - 10085 2012
  • ChemInform
    Villa Eric M., Marr Connor J., Jouffret Laurent J., Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., ChemInform Abstract: Systematic Evolution from Uranyl(VI) Phosphites to Uranium(IV) Phosphates
    43:37, p. no - no 2012
  • Inorganic Chemistry
    Cross Justin N., Villa Eric M., Wang Shuao, Diwu Juan, Polinski Matthew J., Albrecht-Schmitt Thomas E., Syntheses, structures, and spectroscopic properties of plutonium and americium phosphites and the redetermination of the ionic radii of Pu(III) and Am(III)
    51:15, p. 8419 - 8424 2012
  • Journal of the American Chemical Society
    Polinski Matthew J., Wang Shuao, Alekseev Evgeny V., Cross Justin N., Villa Eric M., Grant Daniel J., Depmeier Wulf, Gagliardi Laura, Albrecht-Schmitt Thomas E., Differentiating between trivalent lanthanides and actinides
    134:25, p. 10682 - 10692 2012
  • Inorganic Chemistry
    Villa Eric M., Albrecht-Schmitt Thomas E., Marr Connor J., Jouffret Laurent J., Alekseev Evgeny V., Depmeier Wulf, Systematic evolution from uranyl(VI) phosphites to uranium(IV) phosphates
    51:12, p. 6548 - 6558 2012
  • Chemistry
    Johnson Rene L., Rustud James R., Villa Eric M., Ohlin C. Andre, Casey William H., O17-NMR and Computational Study of a Tetrasiliconiobate Ion, [H2+xSi4Nb16O56](14-x)-
    17:36, p. 9359–9367 2012
  • ChemInform
    Villa Eric M., Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., Wang Shuao, ChemInform Abstract: Facile Routes to ThIV, UIV, and NpIV Phosphites and Phosphates
    42:46, p. no - no 2011
  • European Journal of Inorganic Chemistry
    Villa Eric M., Wang Shuao, Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., Facile routes to ThIV, UIV, and NpIV phosphites and phosphates, p. 3749 - 3754 2011
  • Chemistry - A European Journal
    Johnson Rene L., Villa Eric M., Ohlin C. A., Rustad James R., Casey William H., 17O NMR and computational study of a tetrasiliconiobate ion, [H2+xSi4Nb16O56](14-x)-
    17:34, p. 9359 - 9367 2011
  • ChemInform
    Wang Shuao, Depmeier Wulf, Villa Eric M., Diwu Juan, Alekseev Evgeny V., Albrecht-Schmitt Thomas E., ChemInform Abstract: Role of Anions and Reaction Conditions in the Preparation of Uranium(VI), Neptunium(VI), and Plutonium(VI) Borates
    42:21, p. no - no 2011
  • Chemistry - A European Journal
    Ohlin C. André, Hocking Rosalie K., Harley Stephen J., McAlpin J. Gregory, Mercado Brandon Q., Johnson Rene L., Villa Eric M., Olmstead Marilyn M., Fidler Mary Kate, Spiccia Leone, Britt R. David, Casey William H., Rates of water exchange for two cobalt(II) heteropolyoxotungstate compounds in aqueous solution
    17:16, p. 4408 - 4417 2011
  • Inorganic Chemistry
    Wang Shuao, Villa Eric M., Diwu Juan, Alekseev Evgeny V., Depmeier Wulf, Albrecht-Schmitt Thomas E., Role of anions and reaction conditions in the preparation of uranium(VI), neptunium(VI), and plutonium(VI) borates
    50:6, p. 2527 - 2533 2011
  • Inorganica Chimica Acta
    Ohlin C. André, Villa Eric M., Fettinger James C., Casey William H., The first peroxotitanoniobate cluster - [N(CH3) 4]10[Ti12Nb6O38(O 2I)6]
    363:15, p. 4405 - 4407 2010
  • American Journal of Science
    Villa Eric M., Ohlin C. André, Casey William H., Adding reactivity to structure 2
    310:7, p. 629 - 644 2010
  • Chemistry - A European Journal
    Villa Eric M., André Ohlin C., Casey William H., Borate accelerates rates of steady oxygen-isotope exchange for polyoxoniobate ions in water
    16:29, p. 8631 - 8634 2010
  • Journal of the American Chemical Society
    Villa Eric M., Casey William H., Ohlin C. Andreì, Oxygen-isotope exchange rates for three isostructural polyoxometalate ions
    132:14, p. 5264 - 5272 2010
  • International Journal of Chemical Kinetics
    Weisshaar Duane E., Earl Gary W., Villa Eric M., Zierke Jessica L., Fry Christopher J., Becvar Kara L., Li Shik Ki, Schafer Matthew C., Kinetic study of the reaction of dimethyl carbonate with trialkylamines
    42:4, p. 221 - 225 2010
  • Geochimica et cosmochimica acta
    Casey William H., Ohlin C. Andre, Villa Eric M., Anonymous , How do oxides react? A look at isotope-exchange dynamics in nanometer-size structures in water
    74:12, p. A147 2010
  • Nature Materials
    Ohlin C. André, Casey William H., Villa Eric M., Rustad James R., Dissolution of insulating oxide materials at the molecular scale
    9:1, p. 11 - 19 2010
  • Journal of the American Chemical Society
    Villa Eric M., Ohlin C. André, Rustad James R., Casey William H., Isotope-exchange dynamics in isostructural decametalates with profound differences in reactivity
    131:45, p. 16488 - 16492 2009
  • Dalton Transactions
    Ohlin C. André, Villa Eric M., Fettinger James C., Casey William H., A new titanoniobate ion - Completing the series [Nb10O 28]6-, [TiNb9O28]7- and [Ti2Nb8O28]8-, p. 2677 - 2678 2009
  • Inorganica Chimica Acta
    Ohlin C. André, Villa Eric M., Casey William H., One-pot synthesis of the decaniobate salt [N(CH3)4]6[Nb10O28] · 6H2O from hydrous niobium oxide
    362:4, p. 1391 - 1392 2009
  • ChemInform
    Ohlin C. Andre, Villa Eric M., Fettinger James C., Casey William H., ChemInform Abstract: Distinctly Different Reactivities of Two Similar Polyoxoniobates with Hydrogen Peroxide
    40:1, p. no - no 2009
  • ChemInform
    Ohlin C. Andre, Fettinger James C., Villa Eric M., Casey William H., ChemInform Abstract: The [Ti12Nb6O44]10‐ Ion — A New Type of Polyoxometalate Structure
    39:42, p. no - no 2008
  • Angewandte Chemie - International Edition
    Ohlin C. André, Villa Eric M., Fettinger James C., Casey William H., Distinctly different reactivities of two similar polyoxoniobates with hydrogen peroxide
    47:43, p. 8251 - 8254 2008
  • American Journal of Science
    Villa Eric M., Casey William H., Ohlin C. André, Balogh Edina, Anderson Travis M., Nyman May D., Adding reactivity to structure - Reaction dynamics in a nanometer-size oxide ion in water
    308:8, p. 942 - 953 2008
  • ChemInform
    Villa Eric M., Ohlin C. Andre, Balogh Edina, Anderson Travis M., Casey William H., Nyman May D., Reaction dynamics of the decaniobate ion [HxNb10O28](6-x)- in water
    39:38, p. 4844 - 4846 2008
  • Angewandte Chemie - International Edition
    Ohlin C. André, Casey William H., Villa Eric M., Fettinger James C., The [Ti12Nb6O44]10- ion - A new type of polyoxometalate structure
    47:30, p. 5634 - 5636 2008
  • Angewandte Chemie
    Ohlin C. André, Fettinger James C., Villa Eric M., Casey William H., The [Ti12Nb6O44]10− Ion-A New Type of Polyoxometalate Structure
    120:30, p. 5716 - 5718 2008
  • Angewandte Chemie - International Edition
    Villa Eric M., Anderson Travis M., Ohlin C. André, Balogh Edina, Nyman May D., Casey William H., Reaction dynamics of the decaniobate ion [HxNb 10O28](6-x)- in water
    47:26, p. 4844 - 4846 2008
  • Angewandte Chemie
    Nyman May D, Ohlin C. A, Anderson Travis Mark, Villa Eric M, Balogh Edina, Casey William H, , Reaction Dynamics of the Decaniobate ([HxNb10O28](6-x)-) Ion in Water 2008

Grants

  • The Secret Life of Metals - Middle School Summer Camp (Young Nebraska Scientists)/Sponsor: University of Nebraska, Lincoln/UNL

  • RUI: Reaction Dynamics of Anderson-Type Polyoxometalate Ions in Aqueous Solution: Relating Solid-State Structures with Solution-State Properties/Sponsor: National Science Foundation/NSF

  • The Secret Life of Metals 2022 - Middle School Summer Camp (Young Nebraska Scientists)/Sponsor: University of Nebraska, Lincoln/UNL

  • The Secret Life of Metals 2023 - Middle School Summer Camp (Young Nebraska Scientists)/Sponsor: University of Nebraska, Lincoln/UNL

  • Bridging Solution- and Solid-State Chemistries: Investigations into Fundamental Aqueous Polyoxometalate Ion Reactivity and Targeted Synthesis of Novel Lanthanide Structures/Sponsor: Dreyfus (Camille and Henry) Foundation, Inc.

  • The Secret Life of Metals 2024 - Middle School Summer Camp (Young Nebraska Scientists)/Sponsor: University of Nebraska, Lincoln/UNL

  • The Secret Life of Metals 2025 - Middle School Summer Camp (Young Nebraska Scientists)/Sponsor: University of Nebraska, Lincoln/UNL

Awards

  • Celebrating Belonging Award
    Celebrating Belonging Award through Creighton’s Division Equity, Diversity and Inclusion
    Creighton University
  • 2022 Dean’s Special Award
    Creighton College of Arts and Sciences Dean’s Special Award for Professional Excellence
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • IGGY Award
    The Center for Student Success and Retention "IGGY" Award for Freshman Mentors
    Creighton University
  • Bradford Borge & Corson Fellowship
    University of California, Davis