bluuebunny/crossref_metadata_2025 huggingface dataset:
Ionic Liquids as a Convenient Recyclable Medium for the Generation of Transient Carbonyl Ylides: Syntheses of Oxa and Dioxa‐Bridged Polycyclic Systems.
Authors: Muthusamy Sengodagounder , Gnanaprakasam Boopathy
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
The Use of 4‐(Bromomethylene)‐5,5‐dimethyl‐1,3‐dioxolan‐2‐one as “Masked” α‐Bromo‐α′‐hydroxy Ketone in the Synthesis of Heterocyclic Systems.
Authors: Bogolyubov A. A. , Chernysheva N. B. , Semenov V. V.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Copper‐Catalyzed Allylations of Zirconocene Intermediates Generated from o‐Alkenyl or o‐Alkynylbenzyl Ether Derivatives and Zirconocene‐Butene Complex.
Authors: Ikeuchi Yutaka , Taguchi Takeo , Hanzawa Yuji
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Expedient Synthesis of β,β‐Disubstituted α‐Methylenepropionates.
Authors: Biswas Kallolmay , Boerner Christoph , Gimeno Josepe , Goldsmith Paul J. , Ramazotti Daniella , So Angela L. K. , Woodward Simon
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Stille Cross‐Couplings of Unactivated Secondary Alkyl Halides Using Monoorganotin Reagents.
Authors: Powell David A. , Maki Toshihide , Fu Gregory C.
Published: May 2005

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Synthesis of Functionalized Heterocycles via a Tandem Staudinger/Aza‐Wittig/Ugi Multicomponent Reaction.
Authors: Timmer Mattie S. M. , Risseeuw Martijn D. P. , Verdoes Martijn , Filippov Dmitri V. , Plaisier Jasper R. , van der Marel Gijsbert A. , Overkleeft Herman S. , van Boom Jacques H.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
A Convenient Method for the Preparation of Primary Amines Using Tritylamine.
Authors: Theodorou Vassiliki , Ragoussis Valentine , Strongilos Alexandros , Zelepos Evangelos , Eleftheriou Argyro , Dimitriou Maria
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
General and Selective Synthesis of (Z)‐3‐Haloacrylates via Palladium‐Catalyzed Carbonylation of Terminal Alkynes.
Authors: Li Jin‐Heng , Tang Shi , Xie Ye‐Xiang
Published: May 2005

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Activation of Urea as a Leaving Group in Substitution Reactions of Formamidine Ureas.
Authors: Diaz David D. , Lewis Warren G. , Finn M. G.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Fluorous Mixture Synthesis of 4‐Alkylidene Cyclopentenones via a Rhodium‐Catalyzed [2 + 2 + 1] Cycloaddition of Alkynyl Allenes.
Authors: Manku Sukhdev , Curran Dennis P.
Published: May 2005

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Development, Scope, and Mechanism of the Palladium‐Catalyzed Intramolecular Hydroalkylation of 3‐Butenyl β‐Diketones.
Authors: Qian Hua , Pei Tao , Widenhoefer Ross A.
Published: May 2005

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Palladium‐Catalyzed Arylation of Linear and Cyclic Polyamines.
Authors: Beletskaya Irina P. , Bessmertnykh Alla G. , Averin Alexei D. , Denat Franck , Guilard Roger
Published: May 2005

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Wet THF as a Suitable Solvent for a Mild and Convenient Reduction of Carbonyl Compounds with NaBH4.
Authors: Zeynizadeh Behzad , Behyar Tarifeh
Published: May 2005

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Amberlyst‐15® as a Novel and Recyclable Solid Acid for the Coupling of Aromatic Aldehydes with Homopropargyl Alcohol.
Authors: Yadav J. S. , Reddy B. V. Subba , Vishnumurthy P.
Published: May 2005

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Niobium(V) Chloride Catalyzed C—H Insertion Reactions of α‐Diazoesters: Synthesis of β‐Keto Esters.
Authors: Yadav J. S. , Reddy B. V. Subba , Eeshwaraiah B. , Reddy P. N.
Published: May 2005

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A Mild and Efficient Synthesis of α‐Tosylamino Ketones from Aryl Aziridines in the Presence of β‐Cyclodextrin and NBS in Water.
Authors: Reddy M. Somi , Narender M. , Rao K. Rama
Published: May 2005

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Reaction of Electron Deficient N=N Bonds with Acyloxyketenes and Mesoionic 1,3‐Dioxolium‐4‐olates: Fast Equilibrium Between Acyloxyketenes and Mesoionic 1,3‐Dioxolium‐4‐olates.
Authors: Hamaguchi Masashi , Tomida Naoki , Mochizuki Eiko , Oshima Takumi
Published: May 2005

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Microwave‐Assisted Synthesis of 4,4′‐Diaminotriphenylmethanes.
Authors: Guzman‐Lucero D. , Guzman J. , Likhatchev D. , Martinez‐Palou R.
Published: May 2005

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Gallium(III) Halide Promoted Synthesis of 1,3,5‐Triaryl‐1,5‐dihalo‐1,4‐pentadienes.
Authors: Yadav J. S. , Reddy B. V. S. , Eeshwaraiah B. , Gupta Manoj Kumar , Biswas Swapan Kumar
Published: May 2005

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Protonation and Cyclization of 1,3‐Diarylpropynones in Superacids
Authors: Vasil'ev A. V. , Walspurger S. , Pale P. , Sommer J. , Haouas M. , Rudenko A. P.
Published: May 2005

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Efficient Asymmetric Synthesis of [7]Helicene Bisquinones.
Authors: Carreno M. Carmen , Gonzalez‐Lopez Marcos , Urbano Antonio
Published: May 2005

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Highly Efficient Nickel‐Catalyzed Cross‐Coupling of Succinic and Glutaric Anhydrides with Organozinc Reagents.
Authors: Bercot Eric A. , Rovis Tomislav
Published: May 2005

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Iridium(III)‐Catalyzed Tandem Claisen Rearrangement—Intramolecular Hydroaryloxylation of Aryl Allyl Ethers to Form Dihydrobenzofurans.
Authors: Grant Virginia H. , Liu Bing
Published: May 2005

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A Mild and Practical Copper‐Catalyzed Amination of Halothiophenes.
Authors: Lu Zhikuan , Twieg Robert J.
Published: May 2005

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Synthesis of Indenothiophenone Derivatives by Cycloaromatization of Non‐Conjugated Thienyl Tetraynes.
Authors: Kawano Tomikazu , Inai Hiroki , Miyawaki Kazuhiro , Ueda Ikuo
Published: May 2005

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Efficient Synthesis of 3‐Carboxylate Pyrroles Using Microwave Irradiation.
Authors: Grassi Giovanni , Foti Francesco , Risitano Francesco , Zona Domenico
Published: May 2005

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3‐Aryl‐2‐chloropropanals in Hantzsch Synthesis of Pyrroles.
Authors: Matiychuk V. S. , Martyak R. L. , Obushak N. D. , Ostapiuk Yu. V. , Pidlypnyi N. I.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis of 1‐Methyl‐1H‐pyrrole Derivatives Containing Carbonyl and Sulfamide Fragments.
Authors: Skorenko A. V. , Dorogov M. V. , Kobylinskii D. B. , Balakin K. V. , Kravchenko D. V. , Bushmeleva A. A. Bushmeleva A. A.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis and Structure of Di‐N‐arylpyrrolo[1,2‐c;5,6‐c]cyclooctanes.
Authors: Vizer S. A.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis of 1‐Aryl‐1H‐indazoles via Palladium‐Catalyzed Intramolecular Amination of Aryl Halides.
Authors: Lebedev Artyom Y. , Khartulyari Anton S. , Voskoboynikov Alexander Z.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis and Characterization of a New Series of 3‐(4‐Antipyrinyl)‐2‐thiohydantoin Derivatives.
Authors: Ma Chun‐Ming , Li Jian‐Ping , Zheng Peng‐Zhi
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Reversal of Diastereoselectivity of Mesitonitrile Oxide 1,3‐Dipolar Cycloadditions with Penta‐1,4‐diene‐3‐ol by Mg(II).
Authors: Micuch P. , Fisera L. , Cyranski M. K.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Selective Alkamination of 3,5‐Dihalogeno‐6H‐6‐oxoanthra[1,9‐cd]isoxazoles.
Authors: Yunosova O. N. , Mitrokhin R. V. , Lavrikova T. I. , Titova N. G. , Gornostaev L. M.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis and Biological Activity of New 2‐Amino‐4‐ [3‐methyl‐3‐(5,6,7,8‐tetrahydro‐2‐naphthyl)cyclobutyl]thiazole Derivatives.
Authors: Koparir M. , Cansiz A. , Ahmedzade M.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Efficient Synthesis of Enantiomerically Pure Dihydropyrans.
Authors: Hong Bor‐Cherng , Chen Zhong‐Yi , Nagarajan Arumugam , Rudresha Kottani , Chavan Vishal , Chen Wei‐Hung , Jiang Yea‐Fen , Zhang Shuo‐Cang , Lee Gene‐Hsiang , Sarshar Sepehr
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Imidazolinium Salts as Catalysts for the Aza‐Diels—Alder Reaction.
Authors: Jurcik Vaclav , Wilhelm Rene
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
A New Approach to 3‐Hydroxyquinoline‐2‐carboxylic Acid.
Authors: Riego Estela , Bayo Nuria , Cuevas Carmen , Albericio Fernando , Alvarez Mercedes
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Asymmetric Synthesis of Isoquinoline Derivatives from Amino Acids.
Authors: Sieck Oxana , Ehwald Max , Liebscher Juergen
Published: May 2005

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Condensed Isoquinolines. Part 18. Enamine Properties of Benzimidazo[1,2‐b]isoquinolin‐11(5H)‐one in the Michael Reaction.
Authors: Potikha L. M. , Shkilna N. V. , Kisil V. M. , Kovtunenko V. A.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Reductive Cyclization of N‐(2,4‐Dinitrophenyl)pyridinium Chloride by Tin(II) Chloride.
Authors: Begunov R. S. , Ryzvanovich G. A.
Published: May 2005

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Synthesis, Structure and Properties of Imide Derivatives of Vicinal Pyridinedicarboxylic Acids
Authors: Solov'ev M. Yu. , Filimonov S. I. , Balakin K. V. , Dorogov M. V.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Ring‐Opening of Unsymmetrical 1,2‐Dioxines Using Cobalt(II) Salen Complexes.
Authors: Greatrex Ben W. , Taylor Dennis K.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Highly Selective Mono‐Substitution in Pd‐Catalyzed Cross‐Coupling Reactions of 3,6‐Dichloropyridazine with Organozinc Compounds.
Authors: Chekmarev Dmitriy S. , Stepanov Alexander E. , Kasatkin Alexander N.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis and Biological Activities of Novel 1,2,3,5‐Tetrahydroimidazo[2,1‐b]quinazoline Derivatives.
Authors: Kornicka A. , Saczewski F. , Petrusewicz J. , Rejdych A. , Tyacke R. J. , Hudson A. L. , Nutt D. J.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Preparation of 8‐(Arylsulfanyl)adenines with Diazonium Salts under Mild, Aerobic Conditions.
Authors: Biamonte Marco A. , Shi Jiandong , Hurst David , Hong Kevin , Boehm Marcus F. , Kasibhatla Srinivas R.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
A Highly Selective and Sensitive Fluorescent Chemosensor for Fe3+ in Physiological Aqueous Solution.
Authors: Hua Jun , Wang Yan‐Guang
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Regioselective Hydrosilylations of Propiolate Esters with Tris(trimethylsilyl)silane.
Authors: Liu Yang , Yamazaki Shoko , Yamabe Shinichi
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Unusual Palladium‐Catalyzed Silaboration of Allenes Using Organic Iodides as Initiators: Mechanism and Application.
Authors: Chang Kuo‐Jui , Rayabarapu Dinesh Kumar , Yang Feng‐Yu , Cheng Chien‐Hong
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Chemistry of Phosphorus Ylides. Part 22. Effect of Newly Synthesized Niclosamide Mannich Bases, Phosphopyranones, Phosphoranylidenes, and Oxaphosphinin on Some Metabolic Aspects of Biomphalaria alexandrina.
Authors: Soliman Fouad M. , Said Medhat M. , Maigali Soher S.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Preparation of α‐Substituted γ‐Alkoxyallylstannanes from β‐Tributylstannyl Acrolein Acetals: Scope of the Method and Primary Rationalization of the Obtained Results.
Authors: Fliegel Florian , Beaudet Isabelle , Watrelot‐Bourdeau Sandrine , Cornet Nicolas , Quintard Jean‐Paul
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
New and Simple One‐Step Cobalt‐Catalyzed Preparation of Functionalized Arylstannanes from the Corresponding Aryl Bromides or Iodides.
Authors: Gosmini Corinne , Perichon Jacques
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Tandem Cyclizations Involving α‐Ketenyl Alkyl Radicals. New Syntheses of the Natural Triquinanes Pentalenene and Modhephene.
Authors: De Boeck Benoit , Harrington‐Frost Nicole M. , Pattenden Gerald
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Aspergillazines A—E: Novel Heterocyclic Dipeptides from an Australian Strain of Aspergillus unilateralis.
Authors: Capon Robert J. , Ratnayake Ranjala , Stewart Michael , Lacey Ernest , Tennant Shaun , Gill Jennifer H.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Highly Efficient Dynamic Kinetic Resolution of Azlactones by Urea‐Based Bifunctional Organocatalysts.
Authors: Berkessel Albrecht , Cleemann Felix , Mukherjee Santanu , Mueller Thomas N. , Lex Johann
Published: May 2005

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Palladium Catalysts Supported on Aluminum Oxide for Reductive Condensation of D‐Ribose with 3,4‐Xylidine.
Authors: Nadtochii M. A. , Kuz'micheva E. L. , Rudakova I. P. , Beregovykh V. V.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis of the Benzo‐β‐Carboline Isoneocryptolepine: The Missing Indoloquinoline Isomer in the Alkaloid Series Cryptolepine, Neocryptolepine and Isocryptolepine.
Authors: Hostyn Steven , Maes Bert U. W. , Pieters Luc , Lemiere Guy L. F. , Matyus Peter , Hajos Gyoergy , Dommisse Roger A.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Three New Polymeric Isopropenyl Benzofurans from Ligularia stenocephala.
Authors: Yan Fu‐Lin , Wang Ai‐Xia , Jia Zhong‐Jian
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Highly Convergent Synthesis of a Rebeccamycin Analogue with Benzothioeno(2,3‐a)pyrrolo(3,4‐c)carbazole as the Aglycone.
Authors: Wang Jianji , Soundarajan Nachimuthu , Liu Nian , Zimmermann Kurt , Naidu B. Narasimhulu
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Synthesis of 8‐(S)‐Methoxy‐11‐desmethyl Laulimalide: A Novel Laulimalide Analogue.
Authors: Gallagher Brian M. Jr. , Zhao Hongjuan , Pesant Marc , Fang Francis G.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Investigations on the Synthesis and Pharmacological Properties of N‐Substituted Derivatives of 4‐Alkoxy‐6‐methyl‐1H‐pyrrolo[3,4‐c]pyridine‐1,3(2H)‐diones.
Authors: Sladowska Helena , Filipek Barbara , Szkatula Dominika , Sapa Jacek , Bednarski Marek , Ciolkowska Marta
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
TNU‐7: A Large‐Pore Gallosilicate Zeolite Constructed of Strictly Alternating MOR and MAZ Layers.
Authors: Warrender Stewart J. , Wright Paul A. , Zhou Wuzong , Lightfoot Philip , Camblor Miguel A. , Shin Chae‐Ho , Kim Dong Ja , Hong Suk Bong
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Design and Synthesis of Novel Platelet Fibrinogen Receptor Antagonists with 2H‐1,4‐Benzoxazine‐3(4H)‐one Scaffold. A Systematic Study.
Authors: Dolenc Marija Sollner , et al. et al.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Silicon Nanocrystals: Size Matters
Authors: Heitmann Johannes , Mueller Frank , Zacharias Margit , Goesele Ulrich
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Hydrothermal Synthesis and Characterization of Zeolites
Authors: Wakihara Toru , Okubo Tatsuya
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Aluminum Metal Matrix Composites by Reactive and Semi‐Solid Squeeze Casting
Authors: Fukunaga Hideharu
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Reactions of Aldehydes and Ketones and Their Derivatives
Authors: Murray B. A.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Substituted Acetylenes in Reactions with Sulfide, Thioacetate and Thiocyanate Anions
Authors: Volkov Anatoly , Volkova Kaleria
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Phosphite Ligands in Asymmetric Hydrogenation
Authors: Dieguez Montserrat , Pamies Oscar , Ruiz Aurora , Claver Carmen
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Asymmetric Two‐Center Catalysis
Authors: Shibasaki Masakatsu
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Fluorous Techniques for the Synthesis of Organic Molecules: A Unified Strategy for Reaction and Separation
Authors: Curran Dennis P.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Phosphinic Peptides: Synthetic Approaches and Biochemical Evaluation as Zn‐Metalloprotease Inhibitors
Authors: Yiotakis A. , Georgiadis D. , Matziari M. , Makaritis A. , Dive V.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Piperidine Homoazasugars: Natural Occurrence, Synthetic Aspects and Biological Activity Study
Authors: Dhavale Dilip D. , Matin Mohammed M.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Directed Metalation of Aromatic Compounds
Authors: Clayden Jonathan
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
α‐Amino‐Organolithium Compounds
Authors: Gawley Robert E. , Coldham Iain
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Polylithium Organic Compounds: Syntheses and Selected Molecular Structures
Authors: Strohmann Carsten , Schildbach Daniel
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Arene‐Catalyzed Lithiation
Authors: Yus Miguel
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Paterno—Buechi Reaction on Furan: Regio‐ and Stereochemistry
Authors: D'Auria Maurizio
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Other Diazinodiazines
Authors: Ishikawa T.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Pyridopyrimidines
Authors: Sako M.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Quinazolines
Authors: Kikelj D.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Two Unlike Oxygen, Sulfur, Selenium, or Tellurium Atoms
Authors: Yamazaki S. , Yamamoto K.
Published: May 2005

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Metallocenium Salts of Radical Anion Bis(dichalcogenate) Metalates
Authors: Silva da Gama Vasco Pires , Duarte Maria Teresa
Published: May 2005

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Proton‐Coupled Electron Transfer: A Reaction Chemist′s View
Authors: Mayer James M.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Cytochrome P450 Enzymes in Biosyntheses of Some Plant Secondary Metabolites
Authors: Inoue Kenichiro
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Devising an Especially Efficient Route to the ′Miracle′ Nutrient Coenzyme Q10
Authors: Lipshutz Bruce H.
Published: May 2005

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High Internal Phase Emulsion Templating as a Route to Well‐defined Porous Polymers
Authors: Cameron Neil R.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Implementation of Quality Control Methods (Physico‐Chemical, Microbiological and Sensory) in Conjunction with Multivariate Analysis Towards Fish Authenticity
Authors: Arvanitoyannis Ioannis S. , Tsitsika Efthymia V. , Panagiotaki Panagiota
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Mechanistic Studies of Molybdenum‐Catalyzed Asymmetric Alkylation
Authors: Hughes David L. , Krska Shane W. , Reamer Robert A. , Mathre David J. , Sun Yongkui
Published: May 2005

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Infrared Spectroscopy: Classical Methods
Authors: Saussey Jacques , Thibault‐Starzyk Frederic
Published: May 2005

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Cavity Ring‐Down Spectroscopy of Aromatic Hydrocarbon Radicals
Authors: Tonokura Kenichi , Koshi Mitsuo
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Crystal Chemistry of Synthetic Formestane Precursors and D‐Ring Lactone Analogues: Conformation, Intermolecular Interactions, Packing Motifs and Isostructurality
Authors: Andrade Lourdes C. R. , Ramos Silva Manuela , Almeida Maria Jose M.
Published: May 2005

For Abstract see ChemInform Abstract in Full Text.
Formation of SnO2Nanoparticles on External Surface of NaY Zeolite
Authors: Xiao‐Wen Xu , Jing Wang , Ying‐Cai Long
Published: May 2005

Tin dioxide nanoparticles of 5 nm in size were prepared on NaY zeolite external surface by impregnation of SnCl2solution and subsequent calcination at 623 K. A SnO2‐NaY based chemical sensor for detecting H2was demonstrated.
Dynamic Surface Tensions of Fluorous Surfactant Solutions
Authors: Yan‐An Gao , Wan‐Guo Hou , Zhong‐Ni Wang , Gan‐Zuo Li , Bu‐Xing Han , Gao‐Yong Zhang , Feng‐Feng Lü
Published: May 2005

Dynamic surface properties of aqueous solutions of cationic fluorous surfactant CF3CF2CF2O(CF(CF3)CF2O)2CF(CF3)CONH(CH2)3N+(C2H5)2CH3I‐ (abbrev. FC‐4 ) were reported. The critical micelle concentration (cmc) (3.6×10‐5 mol/L) and equilibrium surface tensions γeq were measured by Krüss K12 tension apparatus. Dynamic surface tension γ(t) was measured in the range of 15 ms to 200 s using the MBP tensiometer. The surface excess Γ, as a function of concentration, was obtained from equilibrium tensiometry using the Gibbs equation. Data from these experiments were combined to analyze the γ(t) decays according to the asymptotic Ward and Tordai equation. The results show that at the initial adsorption stage, the dynamic surface tension data were all consistent with this diffusion‐controlled mechanism, and at the end of the adsorption process, there were some evidences for an adsorption barrier, suggesting a mixed diffusion‐controlled adsorption mechanism. Using measured quantities, the barrier strength was estimated as between 25 and 35 kJ/mol at 25 °C. The surface pressure plays an important role in contributing to the barrier.
Electrochemical Characterization of Benzoyl Formic Acid at Glassy Carbon Electrode in Ionic Liquid: [emim]Br
Authors: Peng Zhao , Qian Sun , Huan Wang , Ming‐Yuan He , Jia‐Xing Lu
Published: May 2005

The direct electrochemical reduction of benzoyl formic acid was investigated in ionic liquid, 1‐ethyl‐3‐methylimidazolium bromide ([emim]Br), using cyclic voltammetry and chronocoulometry. The diffusion coefficient (D) and the transfer coefficient (α) of benzoyl formic acid in [emim]Br were obtained.
Interfacial Electric Properties Between W/O and Bicontinuous Microemulsions of SDS/n‐C5H11OH/n‐C7H16/H2O System
Authors: Rong Guo , Xun Wei , Tian‐Qing Liu
Published: May 2005

In the system of SDS/n‐C5H5OH/n‐C7H16/H2O with the weight ratio of SDS/n‐C5H11OH/H2O system at 5.0/47.5/47.5, the upper phase of the system was W/O microemulsion, and the lower phase was the bicontinuous microemulsion. When the n‐heptane content was less than 1%, with the increase of the n‐heptane content, the capacitance (Co, Cod) in the upper phase (W/O) dropped, the capacitance (CBI, CBId) in the lower phase (BI) raised. At the same time, the W/O‐BI interfacial potential (ΔE), capacitance (Ci), and charge‐transfer current (ict) decreased. After the n‐heptane content reached 1%, with the increase of the n‐heptane content, ΔE, Ci and ict demonstrated no significant change.
Preparation, Molecular Structure and Catalytic Behavior of (ArO)2Yb(NPh2)2K(THF)4(Ar=C6H2‐t‐Bu3‐2,4,6)
Authors: Fu‐Gen Yuan , Hai‐Yan Wang , Yong Zhang
Published: May 2005

Reaction of anhydrous YbCl3with 2 equiv. of sodium 2,4,6‐tri‐tert‐butylphenoxide (ArONa, Ar=C6H2‐t‐Bu3‐2,4,6) and 2 equiv. of potassium diphenyl amide in THF afforded the first bis(aryloxo) amido‐lanthanide complex of (ArO)2Yb(NPh2)2K(THF)4(1). In1, the ytterbium and potassium were bridged via diphenyl amido ligands. The ytterbium metal center was coordinated to two oxygen atoms of aryloxide ligands and two nitrogen atoms of diphenyl amido ligands in a conventional distorted tetrahedral fashion, while the potassium interacted in η2‐fashion with two phenyl rings of the diphenyl amido ligands besides four THF molecules.1displayed moderate catalytic activities for the polymerization of methyl methacrylate and acrylonitrile.
Interaction of Methylamine with Highly Siliceous MFI, FAU and FER‐type Zeolites
Authors: Ai‐Jie Han , Yu Zeng , Juan Guo , Yue‐Fang Huang , He‐Yong He , Ying‐Cai Long
Published: May 2005

The adsorption of methylamine on highly siliceous MFI, FAU and FER‐type zeolites was investigated with XRD, FT‐IR, Raman, 13C and 29Si MAS NMR, and compared with the adsorption of methanol. As the adsorption of the amine, the relative intensity of XRD peaks of the zeolites has been changed significantly, the high‐resolution 29Si MAS NMR peaks have been broadened and shifted to low field, and the resonance of SiOH groups has appeared. The vibration of NH has been shifted to low frequency and CN vibration moved to high frequency in the IR spectra, and the 13C resonance peak broadened and shifted to high field for the adsorbed amine. The facts reveal an associating interaction between the perfect framework of the zeolites and the adsorbed methylamine with hydrogen bonds, leading to the formation of SiOH groups and the high desorption temperature of the methyl‐amine from the zeolites.
Ratiometric Fluorescent Receptors for Monosaccharides Based on the Intramolecular Charge Transfer in p‐Dialkylaminobenzanilides
Authors: Li‐Hong Liu , Han Zhang , Xuan Zhang , Yun‐Bao Jiang
Published: May 2005

Two dual fluorescent receptors (1 and 2) for monosaccharides based on 4‐dialkylaminobenzanilides (alkyl=methyl and n‐butyl) containing boronic acid group at the amido aniline were synthesized and their spectral properties were investigated. These receptors exhibited dual fluorescence with the long‐wavelength band displaying strong solvent‐polarity dependence, indicating the occurrence of the excited‐state intramolecular charge transfer (ICT). With increasing pH value in aqueous solutions, the hybridization of the boron atom changed from sp2 to sp3, inducing a decrease in the total fluorescence quantum yield. The experimental results indicated that the anionic form of the boronate group acted as an electron donor and the benzanilide‐like charge transfer was promoted upon hybridization change. In the presence of monosaccharides, the boronic acid in 1 and 2 changed from neutral to anionic form. The intensity of the locally excited (LE) state emission decreased in the presence of sugars while a slight increase in the intensity at the charge transfer (CT) emission occurred. Based on the change in the CT to LE intensity ratios of 1 and 2 due to sugar binding, ratiometric fluorescent assays for monosaccharide sensing were established.
Electrocatalytic Reduction of NAD+at Multi‐walled Carbon Nanotubes Modified Electrode
Authors: Li‐Ming Chen , Fei Ding , Huan Wang , Wen Zhang , Jia‐Xing Lu
Published: May 2005

The cyclic voltammetric (CV) behaviors of NAD+were studied with a multi‐walled carbon nanotubes (MWNTs) modified glassy carbon (GC) electrode. In 0.05 mol/L tris(hydroxymethyl)aminomethane‐HCl (Tris‐HCl) buffer solution (pH=6.9), the MWNTs modified electrode showed high electrocatalytic activity toward reduction of NAD+. The electroreduction of NAD+was an irreversible diffusion controlled process. The cathodic peak current in‐creased linearly with increasing the concentration of NAD+. The influences of scan rate, temperature and concentration were also investigated.
Synthesis of 5,10,15,20‐Tetra[4‐(N‐ethylpiperazinyl)phenyl]‐porphyrin and Its Interaction with DNA
Authors: Can‐Cheng Guo , He‐Ping Li , Xiao‐Bing Zhang
Published: May 2005

Piperazinyl‐porphyrin, 5,10,15,20‐tetra[4‐(N‐ethylpiperazinyl)phenyl]porphyrin (TEPPH2), was synthesized based on the special affinity of porphyrin to cancer cells and the antitumor activity of piperazine compounds. Its structure was characterized by UV‐vis and 1H NMR spectra and elemental analysis. A model for the interaction between TEPPH2 and calf thymus DNA was built, and the binding mechanism was investigated by UV‐vis and fluorescence spectra. The results indicated that TEPPH2 could intercalate into the base pairs of DNA strongly. One calf thymus DNA molecule could bind 88 TEPPH2 molecules, and the binding constant K is 8.4×106 L·mol‐1. The binding number and binding constant of TEPPH2 with DNA are higher than those of the known anti‐tumor drugs, tetrakis(4‐N‐methylpyridyl)porphine and the Schiff bases Ca/sal‐his and Ni/sal‐aln.
Synthesis, Spectrum, Crystal Structure and Antibacterial Activities of New Polydentate Schiff Base Ligands Containing a Pyridine Ring and Amide Moieties
Authors: Mei‐Ying Li , Pei‐Zhi Hu , Jun‐Cheng Zhu , Yi Liu , Kuo‐Xi Xu
Published: May 2005

Using highly dilute method and 5‐fold excess of diamine a new acyclic diamine containing pyridine moiety, N,N′‐bis(2‐aminoethyl)‐2,6‐pyridinedicarbamide (1a) was synthesized. Six novel linear polydentate Schiff base ligands containing pyridine and amide moieties, N,N′‐bis[β‐(R‐substitutedbenzalimino)ethyl]‐2,6‐pyridinedicar‐bamide (2a‐2e), where R=H, o‐OH, p‐OH, m‐NO2, p‐N(CH3)2, and N,N′‐bis(γ‐salicylideneaminopropyl)‐2,6‐ pyridinedicarbamide (2f) have been synthesized and characterized by elemental analysis, IR, UV‐Vis, MS and 1H NMR methods. The single‐crystal analysis of 2e showed that it belongs to triclinic system with P‐1 space group and the unit cell parameters: a=11.010(2) nm, b=13.865(3) nm, c=9.6537(19) nm, α=102.77(2) °, β=92.07(3)) °, γ=87.98(3)) °, V=1435.7(5) nm3, Z=2, Dc=1.230 mg·cm‐3, Mr=531.66. In addition, microcalorimetric test of the inhibitory capacities of these compounds for E. coli has shown that they have antibacterial activity to different extent and that of salicylidene Schiff base is the best. The structure‐activity relationship has been primarily discussed.
Microstorms in Cellular Polymers: A Route to Soft Piezoelectric Transducer Materials with Engineered Macroscopic Dipoles
Authors: Wegener Michael , Bauer Siegfried
Published: May 2005

Cellular polymers can be internally charged by “microstorms” (silent or partial discharges) within the voids of the polymer foam. The resulting material, which carries positive and negative charges on the internal void surfaces, is called a ferroelectret. Ferroelectrets behave like typical ferroelectrics, hence they provide a novel class of ferroic materials. The soft foams are strongly piezoelectric and can be used, in a wide range of applications, as transducers for interconverting mechanical and electrical signals. Herein, an overview is provided on the preparation of cellular polymers by physical foaming (extrusion, biaxial stretching, and controlled inflation by pressure treatments), on their charging by “microstorms”, on their piezo‐ and pyroelectricity, and on analogies to ferroelectrics. Finally, a survey of selected applications is presented.
Energy Transfer in Single Hydrogen‐Bonded Water Molecules
Authors: Bakker Huib J. , Gilijamse Joop J. , Lock Anjan J.
Published: May 2005

We study the structure and dynamics of hydrogen‐bonded complexes of H2O/HDO and acetone dissolved in carbon tetrachloride by probing the response of the OH stretching vibrations with linear mid‐infrared spectroscopy and femtosecond mid‐infrared pump–probe spectroscopy. We find that the hydrogen bonds in these complexes break and reform with a characteristic time scale of ≈1 ps. These hydrogen‐bond dynamics are observed to play an important role in the equilibration of vibrational energy over the two OH groups of the H2O molecule. For both H2O and HDO, the OH stretching vibrational excitation relaxes with a time constant of 6.3±0.3 ps, and the molecular reorientation has a time constant of 6±1 ps.
Power factor improvement of single‐phase diode rectifier circuit by field‐weakening of inverter‐driven IPM motor
Authors: Takahashi Isao , Haga Hitoshi
Published: May 2005

This paper proposes a novel inverter drive system to improve the input power factor of single‐phase diode rectifier. Conventional rectifiers need a high‐frequency switching device and a reactor to improve the input power factor. However, the proposed power converter does not need the switching device, electrolytic capacitor, or reactor. By making many ripples across the DC‐bus voltage, the input power factor can be improved. The proposed system consists of only a single‐phase diode rectifier, small film capacitor, three‐phase inverter, and motor. The proposed system adopts an interior permanent magnet (IPM) synchronous motor. The IPM motor is well known as a high‐efficiency motor and can realize field weakening. The basic ideas of the inverter control method are based on the following operations: the inverter's controlled synchronous with the DC‐bus ripple voltage by field‐weakening method, and direct active power feeding from the source side to the motor without smoothing the DC‐bus voltage. This paper describes that the proposed method can obtain an input power factor of 97.3% by experimental tests, and realizes the goals of small size and long life of the system. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(2): 66–73, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20047
Study on dependence of AC transport current losses in YBCO‐coated conductors on distribution of critical current density and n value
Authors: Miyagi Daisuke , Tsukamoto Osami
Published: May 2005

We measured AC transport current losses in three kinds of thin‐film YBCO‐coated conductors made by different processes. The results showed that the loss characteristics were different and that some of the conductors did not follow the Norris strip model which is generally believed to well explain the loss characteristics of YBCO conductors. In the paper, an analytical model in which distribution of critical current density and n value of the conductor are taken into consideration is proposed to describe the AC transport current loss characteristics more generally than the Norris strip and elliptical models. It is shown that the analytical model explains well the measured loss characteristics of the three kinds of conductors. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(2): 26–38, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20056
A dynamic mathematical model and vector block diagrams for class of hybrid‐field synchronous motors
Authors: Shinnaka Shinji
Published: May 2005

This paper proposes a new dynamic mathematical model and new block diagrams for a newly emerging class of salient‐pole hybrid‐field synchronous motors (HFSM) that have rotor field by both permanent magnet and winding. The proposed mathematical model has the following completeness and generality. (1) It consists of three consistent basic equations such as circuit, torque, and energy‐transmission equations. (2) It deals with pole saliency and contains nonsaliency as a special case. (3) It is a dynamic model and contains a static one as a special case. (4) It is established in the general reference frame including stator and rotor reference frames as special cases. The proposed new block diagrams using vector signals for salient‐pole HFSM are established based on the model. It has the following attractive features. (1) It succeeds in realizing clear configurations with physically meaningful vector signals, which are helpful for understanding motor electromagnetic mechanisms and useful for designing controllers for the salient‐pole HFSM. (2) Vector signals utilized as transfer signals between blocks are defined in the general reference frame. Consequently, the vector‐signal block diagrams in the frame can be directly and easily reduced to the ones in such a specific frame as stator and rotor frames. (3) It is compact. Two typical and compact but sufficiently general vector‐signal block diagrams are newly presented. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(2): 47–57, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20112
PTC characteristics of (TiC/polyethylene) conductive composites in relation to their particle‐filled structures
Authors: Kataoka Mitsuhiro , Masuko Toru
Published: May 2005

Titanium carbide (TiC)/polyethylene (PE) composites have been prepared with various volume fractions of TiC by a melt bleeding method. Two types of TiC powder with their different particle diameters, 1.48 µm (TiC‐A) and ca. 100 µm (TiC‐B), were utilized in the present study. The electric resistivities (ρ) of the samples decreased gradually with increasing TiC volume fraction (ϕA); in the case of smaller particle size, the value of ρ at room temperature jumped down in the relatively narrow range of ϕA = 0.39 to 0.42, reaching as low as 0.1 Ωcm. Temperature dependencies of ρ were also measured to examine the possible application of the composite to polymer PTC thermistors. The resistivity showed positive temperature dependence and changed abruptly in the tenth order of its magnitude during the melting transition of PE. The electric current cutoff characteristics of the samples indicated excellent features in the overcurrent response despite their low resistivity values, as compared with those of other PTC materials. In parallel, the mechanism of conductivity of the composite was discussed in terms of the percolation theory. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 152(2): 1–9, 2005; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/eej.20115
Systematic and anatomical studies of Inuleae and Plucheeae in Egypt
Authors: Zareh M. M.
Published: May 2005

A systematic revision for the species of tribes Inuleae Cass. s.str. and Plucheeae (Benth.) Anderb. is provided. Four Plucheeae species belonging to four genera and 22 Inuleae species belonging to 11 genera are laggera viscosa comb. nova recognized. Leaf anatomy were studied. A key of the investigated species as well as SEM micrographs of leaf surface are provided. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Tricalcium phosphate and glutaraldehyde crosslinked gelatin incorporating bone morphogenetic protein—A viable scaffold for bone tissue engineering
Authors: Yang Shu‐Hua , Hsu Chung‐King , Wang Kuo‐Cheng , Hou Sheng‐Mou , Lin Feng‐Huei
Published: May 2005

Bone defects caused by various etiologies must be filled with suitable substances to promote bone repair. Autogenous iliac crest graft is most frequently used, but is often associated with morbidities. Several bone graft substitutes have been developed to provide osteoconductive matrices as well as to enhance osteoinductivity. A tricalcium phosphate and glutaraldehyde crosslinked gelatin (GTG) scaffold, incorporated with bone morphogenetic proteins (BMPs), was developed to provide an alternative mean of bone tissue engineering. This study investigated differences between GTG and BMP‐4 immobilized GTG (GTG‐BMP) scaffolds on neonatal rat calvaria osteoblast activities. The GTG scaffold possessed an average pore size of 200 μm and a porosity of 75%. HE staining revealed uniform cell distribution throughout the scaffold 24 h post cell seeding. Alkaline phosphatase (ALP) activity of the GTG samples increased initially and then stabilized at 3 weeks postseeding. ALP activity of the GTG‐BMP samples was similar to that of the GTG samples in the second and third weeks, but it continued increasing and became significantly greater than that of the GTG samples by the fourth week. Gla‐type osteocalcin (Gla‐OC) activity of the GTG‐BMP samples was initially lower, but also became significantly greater than that of the GTG samples by the fourth week. An HE stain revealed greater numbers of attached cells and a richer matrix deposits in the GTG‐BMP samples. A von Kossa stain showed larger mineralizing nodules, in greater numbers, after 4 weeks of in vitro cultivation. These findings suggest that the GTG scaffold provides an excellent porous structure, conductive to greater cell attachment and osteoblast differentiation, and that utility can be significantly enhanced by the inclusion of BMPs. A GTG‐BMP scaffold holds promise as a superior bioactive material for bone tissue engineering. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2005
Grafting reaction of poly(D,L)lactic acid with maleic anhydride and hexanediamine to introduce more reactive groups in its bulk
Authors: Pan Jun , Wang Yuanliang , Qin Suhua , Zhang Bingbing , Luo Yanfeng
Published: May 2005

Bioactivity of biomaterials was a new requirement, especially in tissue engineering and drug delivery. As a traditional used biomaterial, polylactide (PLA) had no bioactivity, of course, and it still had few reactive groups to introduce some bioactive molecules in its bulk. Here, we want to introduce carboxyl groups and amino groups in the side chain of PLA to get more reactive groups for incorporating bioactive molecular later and to maintain the structure of main chain to keep its biodegradability, and to settle the acidity of PLA during hydrolysis at the same time. It was performed as follows: first, maleic anhydride was covalently grafted onto the side chain of PLA by a free radical reaction at 100°C for 20 h with BPO as the initiator. Then, by amidation with a maleic anhydride group on PLA at room temperature, hexanediamine was incorporated. The resulting polymers have been characterized via GPC, 13C NMR, DSC, and TGA. The graft ratio was tested by titration. The pH changes during hydrolysis in 0.1 M PBS with pH 7.4 of PLA, MPLA, and HPLA were investigated. All the results showed that this research has grafted maleic anhydride and then hexanediamine in the bulk of PLA. The molecular weight degradation during reaction was less than 20%. The graft ratios of were 2.68, 2.36, and 1.86%, respectively in 5, 10, and 20% raw MA in MPLA; and the anhydride groups grafted in MPLA can completely react with hexanediamine at room temperature. The pH value of HPLA remained neutral within 12 weeks' hydrolysis compared with the resulted acidity of PLA and MPLA. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2005
Collagen fiber orientation near dental implants in human bone: Do their organization reflect differences in loading?
Authors: Traini Tonino , Degidi Marco , Strocchi Rita , Caputi Sergio , Piattelli Adriano
Published: May 2005

This study is the first to investigate the collagen fiber orientation in human bone around titanium dental implants after loading. Birefringence under circularly polarized light (CPL) and scanning electron microscopy (SEM) investigation were used to assess both collagen orientation and density. Twenty osseointegrated dental implants were retrieved from the mandible bone of 10 patients and were used in the present study. The implants were retrieved after 6 months of function. The birefringence measurements were performed on digitized images using both the peri‐implant bone (PB) and the alveolar bone (AB) retrieved at the moment of implant placing. All images detected at 100× were measured using a software image analysis. The results showed that 32.96% (3.208 ± 0.435 mm2) of the PB area was composed of transverse collagen fibers while only 19.70% (1.957 ± 0.253 mm2) was composed of longitudinally collagen fibers. In the AB 26.99% (2.620 ± 0.520 mm2) of the examined area was composed of transverse collagen fibers while 22.25% (2.160 ± 0.320 mm2) was composed of longitudinally collagen fibers. The CPL measurements of the birefringence indicated that the difference in area between the two collagen fibers orientations was statistically significant (p = 0.03) for both AB and PB. In PB the transverse collagen fibers were significantly increased (p < 0.01) than in AB; also the longitudinal collagen fibers differ significantly in the two groups (p = 0.02). The transverse collagen fibers in PB are more present under the lower flank of the threads where the load acts with a compression vectors, while outside the tip of the implant threads the collagen fibers run more longitudinally due to the loads that act with a tensile vectors. SEM observations showed, in the first collagen layers facing the implant surface, a random direction of the collagen fibers, while in the areas away from the implant surface the collagen fibers were well oriented and run parallel. In conclusion, in these loaded dental implants, the bone adjacent to the first two implant threads shows a significant increase of the amount of transverse collagen fibers that were mainly associated with the lower flank of the threads where compressive load acts. The longitudinal collagen fibers also differs significantly from those found in the AB. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2005
Elution study of unreacted Bis‐GMA, TEGDMA, UDMA, and Bis‐EMA from light‐cured dental resins and resin composites using HPLC
Authors: Sideridou Irini D. , Achilias Dimitris S.
Published: May 2005

In the present work the elution of residual monomers from light‐cured dental resins and resin composites into a 75% ethanol:water solution was studied using High‐Performance Liquid Chromatography (HPLC). The resins studied were made by light‐curing of bisphenol A glycol dimethacrylate (Bis‐GMA), triethylene glycol dimethacrylate (TEGDMA), urethane dimethacrylate (UDMA), ethoxylated bisphenol A glycol dimethacrylate [Bis‐EMA(4)] and mixtures of these monomers. The resin composites were made from two commercial light‐cured restorative materials (Z100 MP and Filtek Z250), the resin matrix of which is based on copolymers of these monomers. The effect of the curing time on the amount of monomers eluted was investigated. The concentration of the extractable monomers was determined at several immersion periods from 3 h to 30 days. For all the materials studied, it was observed that the chemical structure of the monomers used for the preparation of the resins, which defines the chemical and physical structure of the corresponding resin, directly affects the amount of eluted monomers, as well as the time needed for the elution of this amount. In the case of composites, it seems that the elution process it is not influenced by the presence of filler. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2005
No effect of a type I collagen gel coating in uncemented implant fixation
Authors: Svehla M. , Morberg P. , Bruce W. , Walsh W.R.
Published: May 2005

Uncemented joint replacement with a variety of substrate materials, structures, and coatings are commonplace in arthroplasty. Even with specialized surgical preparation of bone, intimate contact between the implant and host bone may not always be achieved. This study evaluated the in vivo effect of fibrillar atelopeptide and PEG crosslinked collagens coatings placed directly into porous sintered bead structures on bone ingrowth using a skeletally mature bicortical, bilateral ovine tibia model. Bone ingrowth into the implants increased with time, although differences were not significant. At 4 weeks woven bone was present within the pores that remodeled with time. Significantly lower levels of ingrowth were observed in the intramedullary region of the implants when compared with the cortical region. Implant metal type did not affect ingrowth in both regions analyzed. Both fibrillar and crosslinked forms of dermal type I collagen did not significantly alter bone ingrowth. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2005