bluuebunny/crossref_metadata_2025_split huggingface dataset:
Predictors for neonatal thrombocytopenia in infants of thrombocytopenic mothers during pregnancy
Authors: Maayan‐Metzger Ayala , Leibovitch Lea , Schushan‐Eisen Irit , Strauss Tzipora , Kenet Gili , Kuint Jacob 
Published: March 2010

AbstractBackgroundAlthough maternal thrombocytopenia during pregnancy is common, its effect on neonatal platelets has not yet been fully evaluated.MethodsWe retrospectively evaluated the rate of thrombocytopenia among 767 healthy term neonates (gestational age 37–42 weeks) born to 723 mothers with pregnancy‐induced thrombocytopenia to define risk factors predicting thrombocytopenia in this group.ResultsThrombocytopenia was diagnosed in 2.2% of the infants. Multivariate analysis showed that infants with thrombocytopenia were more likely to be male, to be born at lower gestational age and to have lower birth weight associated with lower maternal platelets counts. Maternal platelet counts of 100–149 × 109/L, 50–99 × 109/L, and <50 × 109/L corresponded respectively to 1.7%, 4.3%, and 12.5% of neonatal thrombocytopenia (P = 0.031).ConclusionsRoutine blood counts are recommended, in particular for male infants with low birth weight born to mothers with moderate‐to‐severe thrombocytopenia. Pediatr Blood Cancer 2010;55:145–148. © 2010 Wiley‐Liss, Inc.
Thiol versus Selenol SAMs as Nucleation Enhancers and Adhesion Promoters for Plasma Polymerized Pyrrole on Copper Substrates
Authors: Yagüe José Luis , Agulló Núria , Fonder Gregory , Delhalle Joseph , Mekhalif Zineb , Borrós Salvador 
Published: March 2010

AbstractThe use of SAMs to enhance the deposition and growth of polypyrrole (PPy) thin films on a copper substrate by plasma‐enhanced chemical vapor deposition (PECVD) is described. The composition, ordering, and compactness of the monolayers is studied by XPS, PM‐IRRAS, and electrochemical techniques in order to determine their quality. Pyrrole plasma polymerization is carried out on SAMs and on bare copper to study the effect of the monolayer in the deposition process. AFM microscopy demonstrates that, because of the pyrrole‐terminated group, PPy nuclei deposit and grow preferably on the SAM‐modified surface. The PPy films deposited on SAMs show very good adhesion to a copper substrate, which makes them good candidates for new electronic components.
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Structural and functional characterization of CcmG from Pseudomonas aeruginosa, a key component of the bacterial cytochrome c maturation apparatus
Authors: Matteo Adele Di , Calosci Nicoletta , Gianni Stefano , Jemth Per , Brunori Maurizio , Travaglini‐Allocatelli Carlo 
Published: March 2010

AbstractThe cytochrome c maturation process is carried out in the bacterial periplasm, where some specialized thiol‐disulfide oxidoreductases work in close synergy for the correct reduction of oxidized apocytochrome before covalent heme attachment. We present a structural and functional characterization of the soluble periplasmic domain of CcmG from the opportunistic pathogen P. aeruginosa (Pa‐CcmG), a component of the protein machinery involved in cyt c maturation in gram‐negative bacteria. X‐ray crystallography reveals that Pa‐CcmG is a TRX‐like protein; high‐resolution crystal structures show that the oxidized and the reduced forms of the enzyme are identical except for the active‐site disulfide. The standard redox potential was calculated to be E0′ = −0.213 V at pH 7.0; the pKa of the active site thiols were pKa = 6.13 ± 0.05 for the N‐terminal Cys74 and pKa = 10.5 ± 0.17 for the C‐terminal Cys77. Experiments were carried out to characterize and isolate the mixed disulfide complex between Pa‐CcmG and Pa‐CcmH (the other redox active component of System I in P. aeruginosa). Our data indicate that the target disulfide of this TRX‐like protein is not the intramolecular disulfide of oxidized Pa‐CcmH, but the intermolecular disulfide formed between Cys28 of Pa‐CcmH and DTNB used for the in vitro experiments. This observation suggests that, in vivo, the physiological substrate of Pa‐CcmG may be the mixed‐disulfide complex between Pa‐CcmH and apo‐cyt. Proteins 2010. © 2010 Wiley‐Liss, Inc.
Molecular dynamics simulation of SRP GTPases: Towards an understanding of the complex formation from equilibrium fluctuations
Authors: Yang Mingjun , Zhang Xin , Han Keli 
Published: March 2010

AbstractSignal recognition particle (SRP) and its receptor (SR) play essential role in the SRP‐dependent protein targeting pathway. They interact with one another to precisely regulate the targeting reaction. The mechanism of this interaction consists of at least two discrete conformational states: complex formation and GTPase activation. Although structural studies have provided valuable insights into the understanding of the SRP‐SR interaction, it still remains unclear that how SRP and SR GTPases use their intrinsic conformational flexibilities to exert multiple allosteric regulations on this interaction process. Here, we use computational simulations to present the dynamic behavior of the SRP GTPases at an atomic level to gain further understanding of SRP‐SR interaction. We show that: (i) equilibrium conformational fluctuations contain a cooperative inter‐ and intradomain structural rearrangements that are functionally relevant to complex formation, (ii) a series of residues in different domains are identified to correlate with each other during conformational rearrangements, and (iii) α3 and α4 helices at domain interface actively rearrange their relative conformation to function as a bridge between the N domain and the core region of the G domain. These results, in addition to structural studies, would harness our understanding of the molecular mechanism for SRP and SR interaction. Proteins 2010. © 2010 Wiley‐Liss, Inc.
Chemical tools in chromatin research
Authors: Schwarzer Dirk 
Published: March 2010

AbstractEukaryotes organize their DNA in the form of chromatin. This complex of DNA and packaging proteins, the histones, ensures that all genomic information fits into the limited space of the cell nucleus. In addition to compacting DNA, chromatin itself regulates the activity of encoded genes. This regulatory process involves many posttranslational modifications of histone proteins and deciphering the complex crosstalk between histone modifications and gene activity represents a central challenge for biomedical science. This task has often been supported by sophisticated chemical tools, which were crucial for many important discoveries in this field. This review provides an overview of chemical tools for chromatin research, with emphasis on classical and current examples of their applications. Copyright © 2010 European Peptide Society and John Wiley & Sons, Ltd.
Effect of the barrier width on the cathodoluminescence spectra in the strained CdTe/ZnTe superlattices with quantum dot layers
Authors: Kucherenko I. V. , Vinogradov V. S. , Trushin A. S. , Karczewski G. 
Published: March 2010

AbstractThe influence of the ZnTe barrier width on the cathodoluminescence (CL) spectra of the CdTe/ZnTe superlattices (SL) with CdTe quantum dots (QD) is studied. For the samples with the barrier width of 100, 50 and 25 ml CL spectra consist only of a single band with maximum at E = 2.03‐2.01 eV at 80 K. We assign this band to the emission from QD ensemble. For the samples with 10 ml barrier width the emission band splits into two lines of different intensity with maxima at E = 2.01 and 1.95 eV. However the emission spectrum of SL with 5 ml barrier width consists also of only one band with maximum at E = 1.92 eV. We explain these results by the influence of biaxial strain, resulting from the lattice mismatch, on the ground state of the heavy‐hole and light‐hole subbands in CdTe and ZnTe layers. For the CdTe/ZnTe SL with the deposited CdTe layer thickness of 1.5 ml we observed equidistant lines in QD and wetting layer emission bands separated by CdTe 2LO phonon energy (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Characterization of Zn0.95‐xBex Mn0.05Se mixed crystals by photoluminescence and contactless electroreflectance
Authors: Dumcenco Dumitru , Huang Chen‐Tai , Huang Ying‐Sheng , Firszt Franciszek , Łęgowski Stanislaw , Męczyńska Hanna , Zakrzewski Jacek , Tiong Kwong‐Kau 
Published: March 2010

AbstractTemperature‐dependent photoluminescence (PL) and contactless electroreflectance (CER) measurements of Zn0.95‐xBexMn0.05Se mixed crystals with different Be content (0 ≤ x ≤ 0.26) grown by the modified high pressure Bridgman method has been carried out in the temperature range 15–300 K. The peak positions of band‐edge exciton features in the PL spectra are slightly shifted towards lower energies as compared to the corresponding transition energies obtained from CER data. The observed increases of the CER‐PL shift with the increasing of Be content are explained by the increasing compositional disorder causing the smearing of the band‐edge energies. The excitonic line broadening for the samples with larger Be/Zn ratio are attributed in part to the alloy scattering effects and also to the poorer crystalline quality of the samples with higher content of Be. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
MOVPE growth and study of ZnO, ZnMgO epilayers and ZnO/ZnMgO MQW structures
Authors: Kuznetsov Petr , Lusanov Valery , Yakushcheva Galina , Jitov Victor , Zakharov Leonid , Kotelyanskii Iosif , Kozlovsky Vladimir 
Published: March 2010

AbstractDue to large exciton binding energy, ZnO/ZnMgO heterostructures are promising for modern optoelectronic devices in UV range. We report on the metal‐organic vapor phase epitaxy (MOVPE) growth of ZnO, ZnMgO layers and periodic ZnO/ZnMgO MQW structures at atmospheric pressure of hydrogen using diethylzinc (DEZ), bismethyl‐cyclopentadienil‐magnesium ((MeCp)2Mg) and tertiary‐butanol (t‐BuOH) as precursors. Wurtzite‐type layers and MQW structures were grown below 450°C on Al2O3(0001) substrates. The growth rate is constant in the temperature interval from 170 to 430°C and decreases abruptly above 430°C as a result of decomposition in hydrogen. X‐ray measurement confirms the wurtzite structure of ZnMgO films with the Mg content of up to 35%. The as‐grown films show good optical quality and near band edge emission in the photoluminescence (PL) and cathodoluminescence (CL). Periodic ZnO/ZnMgO MQW structures with strong ZnO QWs emission at room temperature were grown. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optical properties of ZnO, Zn0.99Mn0.01O nanopowders
Authors: Sokolov V. I. , Yermakov A. Ye. , Uimin M. A. , Mysik A. A. , Pustovarov V. A. , Gruzdev N. B. , Surikov V. T. 
Published: March 2010

AbstractThe photoluminescence and photoluminescence excitation spectra of Zn0.99Mn0.01O nanopowders are presented in this paper. Detected peaks at energies ħω higher than the energy gap in the photoluminescence excitation spectra allow us to assume that the Zhang‐Rice‐like states in forbidden gap due to the strong exchange coupling between 3d localized spin and valence band holes are related with valence band states perturbed by strong p‐d hybridization (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ZnO nanorods growth on sapphire substrates using aqueous solution with microwave heating and their photoluminescence properties
Authors: Ogata Ken‐ichi , Dobashi Hideaki , Koike Kazuto , Sasa Shigehiko , Inoue Masataka , Yano Mitsuaki 
Published: March 2010

AbstractZnO nanorods were grown on a ‐, c ‐ and r ‐plane sapphire substrates using aqueous solution with microwave irradiation heating. ZnO nanorods about 200 nm diameter with c‐axis orientation were grown independently on the orientation of the substrates. Photoluminescence (PL) spectrum at 6 K showed a dominant peak at 3.3609 eV (I6) with the width as narrow as 2.2 meV comparable to that of epitaxially grown single‐crystalline ZnO films. The PL properties were improved by thermal annealing process without generating structural defects. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Investigation of influence of accelerated rotating wave on solid‐liquid interface in CdZnTe ACRT crystal growth
Authors: Zhou Chenying , Min Jiahua , Wang Changjun , Liang Xiaoyan , Teng Jianyong , Wang Linjun 
Published: March 2010

AbstractProcess of CdZnTe crystal growth with vertical and low pressure Bridgman method (VLPB) was simulated by the software of Comsol Multiphysics. The accelerated crucible rotation technique (ACRT) in VLPB was studied. The simulation results showed that, in trapezoidal accelerated rotating wave, the solid‐liquid interface was appreciably convex and smooth. Meanwhile, the crystal growth rate was also a little greater than crucible dropping rate (1 mm/h), which kept the crystal grow up spontaneously and improved material crystallizability, crystal growth rate and quality (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optical spin orientation of a single manganese atom
Authors: Le Gall C. , Kolodka R. , Besombes L. , Boukari H. , Cibert J. , Ferrand D. , Mariette H. 
Published: March 2010

AbstractAn optical spin orientation is achieved for a Mn atom localized in a semiconductor quantum dot using quasiresonant excitation at zero magnetic field. Optically created spin polarized carriers generate an energy splitting of the Mn spin and enable magnetic moment orientation controlled by the photon helicity and energy.The dynamics and the magnetic field dependence of the optical pumping mechanism shows that the spin lifetime of an isolated Mn atom at zero magnetic field is controlled by a magnetic anisotropy induced by the built‐in strain in the quantum dots. Relaxation times exceeding the micro‐second range are measured (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Synthesis of ZnSe semiconductor nanodot arrays by templated PVD
Authors: Valeev Rishat , Romanov Eduard , Deev Andrew , Beltukov Artemiy , Napolski Kirill , Eliseev Andrei , Krylov Petr , Mezentsev Nikolai , Kriventsov Vladimir 
Published: March 2010

AbstractHere we report a novel approach for preparation of ZnSe nanodot arrays by physical vapor deposition on porous aluminum oxide templates possessing ordered system of channels. The structure of nanodot arrays was investigated by scanning electron microscopy and EXAFS‐spectroscopy. The geometry of nanodots and local atomic structure parameters like the interatomic distances and coordination numbers of Zn and Se atoms are reported. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
EWMA control charts for monitoring binary processes with applications to medical diagnosis data
Authors: Weiß Christian H. , Atzmüller Martin 
Published: March 2010

AbstractTo monitor a binary process, exponentially weighted moving average (EWMA) control charts in different variations are proposed. The average run length performance of the EWMA approach both with standard and with skewness‐corrected 3‐σ control limits is investigated and design recommendations are derived. The proposed EWMA control charts are applied to medical diagnosis data taken from the diagnostic expert system SONOCONSULT in order to provide a semi‐automatic component for monitoring the documentation behavior of different examiners. Copyright © 2010 John Wiley & Sons, Ltd.
Application of AFM in microbiology: a review
Authors: Liu Shaoyang , Wang Yifen 
Published: March 2010

AbstractAtomic force microscopy (AFM) is a powerful tool for microbiological investigation. This versatile technique cannot only image cellular surfaces at high resolution, but also measure many forms of fundamental interactions over scales ranging from molecules to cells. In this work, we review the recent development of AFM applications in the microbial area. We discuss several approaches for using AFM scanning images to investigate morphological characteristics of microbes and the use of force–distance curves to investigate interaction of microbial samples at the nanometer and cellular levels. Complementary techniques used in combination with AFM for study of microbes are also discussed. SCANNING 32: 61–73, 2010. © 2010 Wiley Periodicals, Inc.
Self‐leveling two‐dimensional probe arrays for Dip Pen Nanolithography®
Authors: Haaheim Jason , Val Vadim , Bussan John , Rozhok Sergey , Jang Jae‐Won , Fragala Joe , Nelson Mike 
Published: March 2010

AbstractScanning probe lithography (SPL) has witnessed a dramatic transformation with the advent of two‐dimensional (2D) probe arrays. Although early work with single probes was justifiably assessed as being too slow to practically apply in a nanomanufacturing context, we have recently demonstrated throughputs up to 3×107 µm2/h—in some cases exceeding e‐beam lithography—using centimeter square arrays of 55,000 tips tailored for Dip Pen Nanolithography® (DPN®). Parallelizing DPN has been critical because there exists a need for a lithographic process that is not only high throughput, but also high resolution (DPN has shown line widths down to 14 nm) with massive multiplexing capabilities. Although previous methods required non‐trivial user manipulation to bring the 2D array level to the substrate, we now demonstrate a self‐leveling fixture for NanoInk's 2D nano PrintArray. When mounted on NanoInk's NLP 2000, the 55,000 tip array can achieve a planarity of <0.1° with respect to the substrate in a matter of seconds, with no user manipulation required. Additional fine‐leveling routines (<2min of user interaction) can improve this planarity to <0.002° with respect to the substrate—a Z‐difference of less than 600 nm across 1 cm2 of surface area. We herein show highly homogeneous etch‐resist nanostructure results patterned from a self‐leveled array of DPN pens, with feature size standard deviation of <6% across a centimeter square sample. We illustrate the mechanisms and methods of the self‐leveling fixture, and detail the advantages thereof. Finally, we emphasize that this methodology brings us closer to the goal of true nanomanufacturing by automating the leveling process, reducing setup time by at least a factor of 10, enhancing the ease of the overall printing process, and ultimately ensuring a more level device with subsequently homogeneous nanostructures. SCANNING 32: 49–59, 2010. © 2010 Wiley Periodicals, Inc.
Total synthesis of (+)‐vinblastine: Control of the stereochemistry at C18′
Authors: Yokoshima Satoshi , Tokuyama Hidetoshi , Fukuyama Tohru 
Published: March 2010

AbstractVinblastine has been widely known as a prominent agent in cancer chemotherapy, and in order to search for more potent drugs, various analogs have been derived from natural products. However, because modifications of natural products have limited classes of derivatives, an efficient synthetic route toward vinblastine has been required.Herein a stereocontrolled total synthesis of (+)‐vinblastine is described. The synthesis of the upper half features a stereoselective construction of the tertiary alcohol through a 1,3‐dipolar cycloaddition of nitrile oxide and a Baeyer‐Villiger oxidation, a facile indole formation utilizing a radical cyclization of o‐alkenylthioanilide, and a macrocyclization of 2‐nitrobenzenesulfonamide. The crucial coupling of the upper half with synthetic vindoline was successfully performed to furnish the coupling product in nearly quantitative yield, and subsequent transformations provided (+)‐vinblastine. © 2010 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 10: 101–118; 2010: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.200900025
Hydrothermal Syntheses and Crystal Structures of Two New Three‐dimensional Coordination Polymers Based on 4‐Pyrid‐3‐ylbenzoic Acid
Authors: Guo Feng 
Published: March 2010

AbstractTwo new coordination polymers [Co2(pbc)4(H2O)]n (1) and [Mn(pbc)2] (2) (Hpbc = 4‐pyrid‐3‐ylbenzoic acid) were obtained by hydrothermal reaction and characterized by elemental analysis, IR spectroscopy, and single‐crystal X‐ray diffraction. Compound 1 features a 3D network with a four‐connected 66 net constructed from secondary building units of dinuclear cobalt. Compound 2 exhibits a six‐connected 412·63 topology based on dinuclear manganese.
Crystalline and Glassy Phases in the Ternary System Tl/Bi/Cl: Synthesis and Crystal Structures of the Thallium(I) Chloridobismutates(III) Tl3BiCl6 and TlBi2Cl7
Authors: Beck Johannes , Benz Sebastian 
Published: March 2010

AbstractSlow cooling of melts composed of TlCl and BiCl3 allows for the isolation of the compounds Tl3BiCl6 (1) and TlBi2Cl7 (2). Compound 1 is formed by sublimation at 480 °C from the black melt of 3 TlCl + 1 BiCl3 as colourless crystals. The crystal structure determination (tetragonal, P42/m) consists of nearly regular octahedral [BiCl6]3– anions and two independent Tl+ cations, which have coordination number 8 in form of a slightly distorted cube and 10 in form of an Edshamar polyhedron, respectively. The structure is not isotypic with the recently reported naturally occurring form of Tl3BiCl6, the mineral steropesite. Compound 2 is obtained from a dark red melt of composition TlCl + 2 BiCl3. On rapid cooling, this melt solidifies to a metastable dark red glass which at ambient temperature crystallises to a light amber crystalline powder within some weeks. The structure of 2 was determined by powder diffraction (triclinic, P\bar{1}). A distinct lone pair effect is present causing an irregular coordination on the two independent bismuth atoms. Taking Bi–Cl bonds up to 3.5 Å into account, both bismuth atoms gain coordination number seven. 203Tl and 205Tl solid state NMR and XANES spectra on the Bi and Tl‐LIII edges of both glassy and crystalline TlBi2Cl7 show that a close structural similarity exists between both forms. In contrast, the Raman spectra show distinct differences in the bands of the Bi–Cl vibrations region.
Two AgI–Carboxylate Polymers Involving Ag–Ag Interactions: Syntheses, Structures and Fluorescent Properties
Authors: Li Jun‐Xia , Du Zhong‐Xiang , An Hui‐Qin , Dong Jian‐Xun , Hu Xiao‐Jing , Huang Wei‐Ping 
Published: March 2010

AbstractTwo novel silver complexes [Ag2(Hsal)2]n (1) and [Ag2(oda)]n (2) (H2sal = salicylic acid, H2oda = oxydiacetatic acid) were synthesized hydrothermally by reaction of AgNO3 with H2sal or H2oda and characterized by IR spectroscopy, elemental analysis, and single‐crystal X‐ray diffraction. Compound 1 shows a 2D metal‐organic architecture connected by μ3‐η1:η1:η1‐salicylato ligands and Ag–Ag interactions. Compound 2 displays a 3D metal‐organic network formed by μ7‐(η2:η1)‐(η2:η1)‐η1‐oxydiacetato ligands and Ag–Ag interactions. The photoluminescence properties of both complexes were also investigated.
SrPd4B and BaPd4B: New Type of Crystal Structure and Physical Properties
Authors: Gumeniuk Roman , Schmitt Miriam , Schnelle Walter , Burkhardt Ulrich , Rosner Helge , Leithe‐Jasper Andreas 
Published: March 2010

AbstractTwo new intermetallic alkaline‐earth palladium borides, SrPd4B and BaPd4B were synthesised and their physical properties were investigated. The crystal structure of SrPd4B was solved from powder X‐ray diffraction data: new structure type, space group Pnma, a = 6.0014(1) Å, b = 5.5041(1) Å, c = 11.8723(2) Å, RI = 0.065, RP = 0.093. BaPd4B is isostructural with a = 6.0883(1) Å, b = 5.6066(1) Å, c = 12.0050(2) Å, RI = 0.062, RP = 0.097. The relationship of this structure type with the series of derivatives of the CaCu5 type is discussed. Calculated electronic band structures for palladium, Pd3B, SrPd5, SrPd4B and SrPd3B are compared. The role of boron and strontium for the electronic properties is discussed in detail. SrPd4B shows metallic behaviour with a DOS(EF) ≈︁ 1.7 eV–1·f.u.–1 at the Fermi level. Magnetic properties, electrical resistivity and specific heat capacity measurements reveal that the two compounds are diamagnetic metallic conductors with low electronic density of states, in agreement, with the electronic structure calculations.