bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of cross‐linkers in fabrication of carrageenan–alginate matrices for tissue engineering application
Authors: Ki Saet Byul , Singh Deepti , Kim Seong Cheol , Son Tae Won , Han Sung Soo 
Published: May 2013

AbstractThe three‐dimensional (3D) scaffold serves as a structural substrate and as a niche for cell proliferation to ensure tissue regeneration. Ideal scaffolds should have porous structures with high pore interconnectivity to allow cell adherence, differentiation, and proliferation while ensuring suitable mechanical strength and biodegradability without inflicting any immune response. Cross‐linker is one of the major factors that affect the mechanical and biological properties of scaffolds. In this study, different chemical cross‐linker effects on scaffold architecture were examined. Porous 3D scaffolds based on carrageenan and alginate (CA) were successfully fabricated by a freeze‐drying technique and using various cross‐linkers like glutaraldehyde (GA), genipin, and ethyl (dimethylamino propyl) carbodiimide/N‐hydroxysuccinimide (EDC/NHS). The chemical cross‐linker effects on the CA scaffold were characterized by scanning electron microscopy, differential scanning calorimetry, and thermogravimetry. A human fibroblast cell line (L929) was seeded into the fabricated scaffold, and cell proliferation was assessed by MTT and live/dead assay. Overall results suggested the potential cross‐linkers for ideal CA biomaterial could be EDC/NHS among other agents tested as the scaffold CAEN was found to be porous, interconnected, and physically and mechanically stable. When compared to matrices with other cross‐linkers, higher cell attachment, better cellular response, and higher metabolic activity could be observed in the scaffold synthesized using EDC/NHS as cross‐linker.
Prenatal alcohol exposure in the Republic of the Congo: Prevalence and screening strategies
Authors: Williams Andrew D. , Nkombo Yannick , Nkodia Gery , Leonardson Gary , Burd Larry 
Published: May 2013

AbstractObjectiveTo determine prevalence of prenatal alcohol use in Brazzaville, Congo and to evaluate a prenatal screening tool for use in this population.MethodsA prospective population screening program of 3099 women at 10 prenatal care clinics in Brazzaville, Congo using the 1‐Question screen. To validate the 1‐Question screen in this population we screened 764 of these women again using the T‐ACE as a gold standard for comparison study. The study outcomes were as follows: prevalence of self‐reported prenatal alcohol use in Brazzaville using the 1‐Question screen, estimation of number of drinking days, drinks per drinking day, most drinks on any one occasion. We also estimated the epidemiologic performance criteria for the 1‐Question screen.ResultsThe 3099 women screened were classified as follows: no risk 77% (n = 2,384); at risk 3.7% (n = 115); and as high risk 19.3% (n = 600). Of the women reporting drinking during pregnancy, 87.4% reported drinking 4 or more drinks on any occasion. The agreement for detection of alcohol use during pregnancy by the 1‐Question Screen and a positive T‐ACE score was 94.7%.Conclusions23.3% of women attending prenatal care in Brazzaville reported alcohol use during pregnancy and 83% of them continued to drink after recognition of pregnancy. Prenatal alcohol exposure should be the focus of efforts to improve identification of alcohol use prior to and during pregnancy to improve maternal and child health. Birth Defects Research (Part A) 97:489–496, 2013. © 2013 Wiley Periodicals, Inc.
Coupling elastic solids with smoothed particle hydrodynamics fluids
Authors: Akinci Nadir , Cornelis Jens , Akinci Gizem , Teschner Matthias 
Published: May 2013

ABSTRACTWe propose a method for handling elastic solids in smoothed particle hydrodynamics fluids. Our approach samples triangulated surfaces of solids using boundary particles. To prevent fluid particle tunneling in case of large expansions, additional boundary particles are adaptively generated to prevent gaps and undesired leakage. Furthermore, as an object compresses, particles are adaptively removed to avoid unnecessary computations. We demonstrate that our approach produces plausible interactions of smoothed particle hydrodynamics fluids with both slowly and rapidly deforming solids. Copyright © 2013 John Wiley & Sons, Ltd.
Simulating and animating social dynamics: embedding small pedestrian groups in crowds
Authors: Park Seung In , Quek Francis , Cao Yong 
Published: May 2013

ABSTRACTWe present a crowd model informed by common ground theory to accommodate high‐level socially aware behavioral realism of characters in crowd simulations. In our approach, group members maintain group cohesiveness by communicating and adapting their behaviors to each other. The resulting character behaviors in animations form a consequential chain interpreted as a coherent story by observers. We demonstrate that our model produces more believable animations from the viewpoint of human observers through a series of user studies. Copyright © 2013 John Wiley & Sons, Ltd.
Pencil drawing animation from a video
Authors: Liang Dongxue , Park Kyoungju 
Published: May 2013

ABSTRACTWe present an automatic, efficient, and simple technique to create pencil drawing animation, starting from a video. We generate pencil drawing from a source frame based on stroke modeling, specifying the properties of strokes, in combination with layered lines, flow‐guided difference‐of‐Gaussian (DoG) filter to several layers. Generated pencil strokes are translated and rotated because of forces exerted from the sequential frames using rigid body dynamics. Linear and angular forces acting on strokes are calculated according to the temporally filtered per‐pixel optical flow vectors. Our framework effectively generates the coherent animation of pencil strokes preserving the structured appearance of charcoal or pastel, which is difficult to achieve with previous‐abstraction based non‐photorealistic animation. Moreover, our stroke simulation step is suitable for animating the different styles of strokes, such as oil painting and watercolor, and can be efficiently implemented to produce animation in relatively inexpensive manner. Copyright © 2013 John Wiley & Sons, Ltd.
Interactive elastic motion editing through space–time position constraints
Authors: Li Siwang , Huang Jin , Desbrun Mathieu , Jin Xiaogang 
Published: May 2013

ABSTRACTWe present an intuitive and interactive approach for motion editing through space–time constraints on positions. Given an input motion of an elastic body, our approach enables the user to interactively edit node positions in order to alter and fine‐tune the motion. We formulate our motion editing as an optimization problem with dynamics constraints to enforce a physically plausible result. Through linearization of the editing around the input trajectory, we simplify this constrained optimal control problem into an unconstrained quadratic optimization. The optimal motion thus becomes the solution of a dense linear system, which we solve efficiently by applying the adjoint method in each iteration of a conjugate gradient solver. We demonstrate the efficiency and quality of our motion editing technique on a series of examples. Copyright © 2013 John Wiley & Sons, Ltd.
Physically based cosmetic rendering
Authors: Huang Cheng‐Guo , Huang Tsung‐Shian , Lin Wen‐Chieh , Chuang Jung‐Hong 
Published: May 2013

ABSTRACTSimulating realistic makeup effects is one of the important research issues in the 3D facial animation and cosmetic industry. Existing approaches based on image processing techniques, such as warping and blending, have been mostly applied to transfer one's makeup to another's. Although these approaches are intuitive and need only makeup images, they have some drawbacks, for example, distorted shapes and fixed viewing and lighting conditions. In this paper, we propose an integrated approach, which combines the Kubelka–Munk model and a screen‐space skin rendering approach, to simulate 3D makeup effects. The Kubelka–Munk model is used to compute total transmittance when light passes through cosmetic layers, whereas the screen‐space translucent rendering approach simulates the subsurface scattering effects inside human skin. The parameters of Kubelka–Munk model are obtained by measuring the optical properties of different cosmetic materials, such as foundations, blushes, and lipsticks. Our results demonstrate that the proposed approach is able to render realistic cosmetic effects on human facial models, and different cosmetic materials and styles can be flexibly applied and simulated in real time. Copyright © 2013 John Wiley & Sons, Ltd.
Decoupled Roles for the Atypical, Bifurcated Binding Pocket of the ybfF Hydrolase
Authors: Ellis Elizabeth E. , Adkins Chinessa T. , Galovska Natalie M. , Lavis Luke D. , Johnson R. Jeremy 
Published: May 2013

AbstractSerine hydrolases have diverse intracellular substrates, biological functions, and structural plasticity, and are thus important for biocatalyst design. Amongst serine hydrolases, the recently described ybfF enzyme family are promising novel biocatalysts with an unusual bifurcated substrate‐binding cleft and the ability to recognize commercially relevant substrates. We characterized in detail the substrate selectivity of a novel ybfF enzyme from Vibrio cholerae (Vc‐ybfF) by using a 21‐member library of fluorogenic ester substrates. We assigned the roles of the two substrate‐binding clefts in controlling the substrate selectivity and folded stability of Vc‐ybfF by comprehensive substitution analysis. The overall substrate preference of Vc‐ybfF was for short polar chains, but it retained significant activity with a range of cyclic and extended esters. This broad substrate specificity combined with the substitutional analysis demonstrates that the larger binding cleft controls the substrate specificity of Vc‐ybfF. Key selectivity residues (Tyr116, Arg120, Tyr209) are also located at the larger binding pocket and control the substrate specificity profile. In the structure of ybfF the narrower binding cleft contains water molecules prepositioned for hydrolysis, but based on substitution this cleft showed only minimal contribution to catalysis. Instead, the residues surrounding the narrow binding cleft and at the entrance to the binding pocket contributed significantly to the folded stability of Vc‐ybfF. The relative contributions of each cleft of the binding pocket to the catalytic activity and folded stability of Vc‐ybfF provide a valuable map for designing future biocatalysts based on the ybfF scaffold.
Snare vegetectomy for right‐sided endocarditis
Authors: Seow Swee‐Chong , Lin Wei‐Qin , Wong Raymond C.C. 
Published: May 2013

IntroductionA middle‐aged male developed right‐sided endocarditis from an infection of an implantable cardiac defibrillator (ICD) system. Following percutaneous device and lead explantation, a very large pedunculated vegetation (19 mm × 14 mm) was found on the Eustachian valve. We decided to remove the vegetation percutaneously using a wire snare instead of open heart surgery.Case reportReal‐time three‐dimensional transesophageal echocardiography and fluoroscopy were used to guide the procedure. Access was from the right femoral vein. Using a triple‐loop wire snare through a deflectable sheath, the vegetation was successfully removed in its entirety without complications.ConclusionPercutaneous snare vegetectomy is feasible and may be a viable option in place of open heart surgery in selected patients. © 2013 Wiley Periodicals, Inc.
Mechanistic Study of Ethanol Dehydrogenation over Silica‐Supported Silver
Authors: Sushkevich Vitaly L. , Ivanova Irina I. , Taarning Esben 
Published: May 2013

AbstractA silica‐supported Ag catalyst has been shown to be an efficient heterogeneous catalyst for the oxidant‐free dehydrogenation of ethanol into acetaldehyde. The reaction mechanism has been investigated by in situ FTIR spectroscopy. The kinetic isotope effects for proton and hydride abstraction have been studied by using CH3CD2OH and CH3CH2OD as labeled reactants. The results indicate that OH bond activation and the formation of a hydrogen‐bonded complex take place on the silica support and that the Ag particles are necessary for the activation of the CH bond. The kinetic isotope effect (kH/kD) is 1.9 for CH3CD2OH and 1.8 for CH3CH2OD. The concerted mechanism of CH cleavage on the Ag sites and proton abstraction on the silica sites is proposed to account for the results of the spectroscopic and kinetic experiments.
Solvent‐Dependent Enantiodivergence in the Chlorocyclization of Unsaturated Carbamates
Authors: Garzan Atefeh , Jaganathan Arvind , Salehi Marzijarani Nastaran , Yousefi Roozbeh , Whitehead Daniel C. , Jackson James E. , Borhan Babak 
Published: May 2013

AbstractA remarkable solvent‐controlled enantiodivergence is seen in the hydroquinidine 1,4‐phthalazinediyl diether ((DHQD)2PHAL)‐catalyzed chlorocyclization of unsaturated carbamates. Eyring plot analyses of this previously unreported reaction are used to probe and compare the R‐ and S‐selective pathways. In the CHCl3/hexanes solvent system, the pro‐R process shows a surprising increase in selectivity with increasing temperature. These studies point to a strongly solvent‐dependent entropy–enthalpy balance between the pro‐R and pro‐S pathways.
Iron(III) Triflimide as a Catalytic Substitute for Gold(I) in Hydroaddition Reactions to Unsaturated Carbon–Carbon Bonds
Authors: Cabrero‐Antonino Jose R. , Leyva‐Pérez Antonio , Corma Avelino 
Published: May 2013

AbstractIn this work it is shown that iron(III) and gold(I) triflimide efficiently catalyze the hydroaddition of a wide array of nucleophiles including water, alcohols, thiols, amines, alkynes, and alkenes to multiple CC bonds. The study of the catalytic activity and selectivity of iron(III), gold(I), and Brønsted triflimides has unveiled that iron(III) triflimide [Fe(NTf2)3] is a robust catalyst under heating conditions, whereas gold(I) triflimide, even stabilized by PPh3, readily decomposes at 80 °C and releases triflimidic acid (HNTf2) that can catalyze the corresponding reaction, as shown by in situ 19F, 15N, and 31P NMR spectroscopy. The results presented here demonstrate that each of the two catalyst types has weaknesses and strengths and complement each other. Iron(III) triflimide can act as a substitute of gold(I) triflimide as a catalyst for hydroaddition reactions to unsaturated carbon–carbon bonds.
QM/MM Study on the Light Emitters of Aequorin Chemiluminescence, Bioluminescence, and Fluorescence: A General Understanding of the Bioluminescence of Several Marine Organisms
Authors: Chen Shu‐Feng , Ferré Nicolas , Liu Ya‐Jun 
Published: May 2013

AbstractAequorea victoria is a type of jellyfish that is known by its famous protein, green fluorescent protein (GFP), which has been widely used as a probe in many fields. Aequorea has another important protein, aequorin, which is one of the members of the EF‐hand calcium‐binding protein family. Aequorin has been used for intracellular calcium measurements for three decades, but its bioluminescence mechanism remains largely unknown. One of the important reasons is the lack of clear and reliable knowledge about the light emitters, which are complex. Several neutral and anionic forms exist in chemiexcited, bioluminescent, and fluorescent states and are connected with the H‐bond network of the binding cavity in the protein. We first theoretically investigated aequorin chemiluminescence, bioluminescence, and fluorescence in real proteins by performing hybrid quantum mechanics and molecular mechanics methods combined with a molecular dynamics method. For the first time, this study reported the origin and clear differences in the chemiluminescence, bioluminescence and fluorescence of aequorin, which is important for understanding the bioluminescence not only of jellyfish, but also of many other marine organisms (that have the same coelenterazine caved in different coelenterazine‐type luciferases).
Highly Stereoselective Conjugate Addition and α‐Alkynylation Reaction with Electron‐Deficient Alkynes Catalyzed by Chiral Scandium(III) Complexes
Authors: Wang Zhen , Zhang Zuliang , Yao Qian , Liu Xiaohua , Cai Yunfei , Lin Lili , Feng Xiaoming 
Published: May 2013

AbstractThe highly Z‐selective asymmetric conjugate addition of 3‐substituted oxindoles to alkynyl carbonyl compounds has been developed by using scandium complexes of chiral N,N′‐dioxides under mild conditions. The thermodynamically unstable Z‐olefin derivatives were obtained in excellent yields and high enantiomeric and geometric control. The catalyst was also found to be effective in the asymmetric acetylenic substitution reaction of 3‐substituted oxindoles, giving excellent enantioselectivities.
Fast, Reversible Lithium Storage with a Sulfur/Long‐Chain‐Polysulfide Redox Couple
Authors: Su Yu‐Sheng , Fu Yongzhu , Guo Bingkun , Dai Sheng , Manthiram Arumugam 
Published: May 2013

AbstractThe cathodic reactions in Li–S batteries can be divided into two steps. Firstly, elemental sulfur is transformed into long‐chain polysulfides (S8↔Li2S4), which are highly soluble in the electrolyte. Next, long‐chain polysulfides undergo nucleation reaction and convert into solid‐state Li2S2 and Li2S (Li2S4↔Li2S) by slow processes. As a result, the second‐step of the electrochemical reaction hinders the high‐rate application of Li–S batteries. In this report, the kinetics of the sulfur/long‐chain‐polysulfide redox couple (theoretical capacity=419 mA h g−1) are experimentally demonstrated to be very fast in the Li–S system. A Li–S cell with a blended carbon interlayer retains excellent cycle stability and possesses a high percentage of active material utilization over 250 cycles at high C rates. The meso‐/micropores in the interlayer are responsible for accommodating the shuttling polysulfides and offering sufficient electrolyte accessibility. Therefore, utilizing the sulfur/long‐chain polysulfide redox couple with an efficient interlayer configuration in Li–S batteries may be a promising choice for high‐power applications.
ChemInform Abstract: The Modulated Structure of Co3Al4Si2: Incommensurability and Co—Co Interactions in Search of Filled Octadecets.
Authors: Fredrickson Rie T. , Fredrickson Daniel C. 
Published: May 2013

AbstractCo3Al4Si2 is prepared by arc melting of Co, Al, and Si in the ratio 3:5:2 followed by annealing (fused silica tube, Ar, 800 °C, 4 weeks).
ChemInform Abstract: Synthesis, Structure, and Properties of Ln2Ru3Al15 (Ln: Ce, Gd): Comparison with LnRu2Al10 and CeRu4(Al,Si)15.58.
Authors: Morrison Gregory , Haldolaarachchige Neel , Chen Chih‐Wei , Young David P. , Morosan Emilia , Chan Julia Y. 
Published: May 2013

AbstractAttempts to obtain phase‐pure Ln2Ru3Al15 (Ln: Ce, Gd) from the elements by either flux melting, induction heating, or arc melting show that the latter method is the most suitable one (alumina crucible, final annealing at 1150 °C, 6 d).
ChemInform Abstract: Neutron Diffraction Study of the Li‐Ion Battery Cathode Li2FeP2O7.
Authors: Barpanda Prabeer , Rousse Gwenaelle , Ye Tian , Ling Chris D. , Mohamed Zakiah , Klein Yannick , Yamada Atsuo 
Published: May 2013

AbstractLi2FeP2O7 is prepared by solid state reaction of a stoichiometric mixture of Li2CO3, Fe2C2O4, and (NH4)2HPO4 (600 °C, 12 h).
ChemInform Abstract: (C4N2H12)3 [Ln3(OH)(SO4)7] (Ln: Sm, Eu, and Tb): A Series of Honeycomb‐Like Open‐Framework Lanthanide Sulfates with Extra‐Large Channels Containing 24‐Membered Rings.
Authors: Zhang Deng , Lu Yun , Zhu Dunru , Xu Yan 
Published: May 2013

AbstractThe honeycomb‐like lanthanide sulfates (H2pip)3 [Ln3(OH)(SO4)7] (Ln: Sm, Eu, and Tb; pip: piperazine) are prepared by solvothermal reaction of Ln2O3, H2SO4, and piperazine in a 3:2 glycol/H2O mixed solvent (autoclave, 453 K, 6 d).
ChemInform Abstract: The Gadolinium Nitride Selenides Gd3NSe3 and Gd23N5Se27: Three Connectivity Types of [NGd4]9+ Tetrahedra and Fivefold Coordinated Gd3+ Cations.
Authors: Schurz Christian M. , Talmon‐Gros Pia , Lissner Falk , Schleid Thomas 
Published: May 2013

AbstractThe title compounds are prepared by reaction of Gd metal with Se, CsN3, GdI3, and an excess of CsI as flux (silica ampule, 900 °C, 7 d).
ChemInform Abstract: Synthesis, Structure and Characterization of Two New Polar Sodium Tungsten Selenites: Na2(WO3)3 (SeO3)·2H2O and Na6(W6O19)(SeO3)2.
Authors: Nguyen Sau Doan , Halasyamani P. Shiv 
Published: May 2013

AbstractThe new compounds (IV) and (V) are characterized by single crystal XRD, IR and UV/VIS diffuse reflectance spectroscopy, and second harmonic generation, piezoelectric, and polarization measurements.
ChemInform Abstract: Chiral‐Anion‐Dependent Inversion of Diastereo‐ and Enantioselectivity in Carbonyl Crotylation via Ruthenium‐Catalyzed Butadiene Hydrohydroxyalkylation.
Authors: McInturff Emma L. , Yamaguchi Eiji , Krische Michael J. 
Published: May 2013

AbstractThe ruthenium catalyst generated in situ from H2Ru(CO)(PPh3)3, (S)‐SEGPHOS, and a TADDOL‐derived phosphoric acid (TPA) promotes butadiene hydrohydroxyalkylation to form enantiomerically enriched products.
ChemInform Abstract: Oxidative Cleavage of Lactams in Water Using Dioxiranes: An Expedient and Environmentally‐Safe Route to ω‐Nitro Acids.
Authors: Annese Cosimo , D'Accolti Lucia , Filardi Rosella , Tommasi Immacolata , Fusco Caterina 
Published: May 2013

AbstractConditions A) are found to be optimal for the preparation of the desired target acids.
ChemInform Abstract: A Concise Assembly of Electron‐Deficient 2,4‐Dienes and 2,4‐Dienals: Regio‐ and Stereoselective exo‐Diels—Alder and Redox Reactions Through Sequential Amine and Carbene Catalysis.
Authors: Ma Chao , Jia Zhi‐Jun , Liu Jing‐Xin , Zhou Qing‐Qing , Dong Lin , Chen Ying‐Chun 
Published: May 2013

AbstractThis reaction proceeds with high regio‐, diastereo‐ and enantioselectivity (compounds (IV) and (VI) are formed as single diastereomers).
ChemInform Abstract: Tandem Broensted Acid Promoted and Nazarov Carbocyclizations of Enyne Acetals to Hydroazulenones.
Authors: Escalante Luz , Gonzalez‐Rodriguez Carlos , Varela Jesus A. , Saa Carlos 
Published: May 2013

AbstractThe reaction proceeds under metal‐free conditions and allows the access to various bicyclic products consisting of a cyclopentenone and a 7‐membered moiety.
ChemInform Abstract: Palladium‐Free Synthesis of Unsymmetrical Diarylethynes by Cross‐Coupling Reaction of Alkynylboronates with Aryl Iodides Catalyzed by CuCl.
Authors: Ogawa Daisuke , Li Jing , Suetsugu Masato , Jiao Jiao , Iwasaki Masayuki , Nishihara Yasushi 
Published: May 2013

AbstractThe method allows the access to a broad spectrum of title compounds.
ChemInform Abstract: Planar Chiral [2.2]Paracyclophane‐Based Phosphine‐Broensted Acid Catalysts Bearing Exceptionally High Reactivity for Aza‐Morita—Baylis—Hillman Reaction.
Authors: Kitagaki Shinji , Ohta Yuu , Takahashi Ryohei , Komizu Mika , Mukai Chisato 
Published: May 2013

AbstractNew title compounds are synthesized and tested as catalysts.
ChemInform Abstract: Asymmetric Organocatalytic Reduction of Ketimines with Catecholborane Employing a N‐Triflyl Phosphoramide Broensted Acid as Catalyst.
Authors: Enders Dieter , Rembiak Andreas , Seppelt Matthias 
Published: May 2013

AbstractOptimized conditions are elaborated which allow the preparation of the desired amines with moderate to good enantioselectivity which depends on the substitution pattern of the aryl moiety.
ChemInform Abstract: Cooperatively Assisted N‐Arylation Using Organic Ionic Base—Broensted Acid Combination under Controlled Microwave Heating.
Authors: Singh Rahul , Allam Bharat Kumar , Raghuvanshi Dushyant Singh , Singh Krishna Nand 
Published: May 2013

AbstractA new synthetic strategy is developed for the construction of C‐N bonds through the combined assistance of Broensted acid/DBU·AcOH without adding any metal catalyst.
ChemInform Abstract: Zinc(II)‐Catalyzed Oxidation of Alcohols to Carbonyl Compounds with Chloramine‐T.
Authors: Wang Peng , Cai Jin , Yang Jiabin , Sun Chunlong , Li Lushen , Hu Huayou , Ji Min 
Published: May 2013

AbstractVarious primary and secondary alcohols are rapidly oxidized without overoxidation to carboxylic acids.