105,221 research outputs found
End-capping of conjugated thiophene-benzene aromatic systems
No full textThe synthesis of end-capped thieno[3,2-f:4,5-f′]bis[1]benzothiophene was achieved from thiophene and 2,5-thiophenedicarboxaldehyde. Specifically, hexyl and dodecyl end-capping groups conferred reversible redox behavior as evidenced by cyclic voltammetry with oxidation potentials of 0.73 V versus Fc-Fc+ couple. An extensive spectrophotometric analysis is reported. © 2010 Elsevier Ltd. All rights reserved.Barrash-Shiftan N, 1998, J PHYS ORG CHEM, V11, P743, DOI 10.1002-(SICI)1099-1395(1998100)11:10743::AID-POC393.0.CO;2-H; BAUERLE P, 1993, SYNTHESIS-STUTTGART, P1099, DOI 10.1055-s-1993-26009; Brusso JL, 2008, CHEM MATER, V20, P2484, DOI 10.1021-cm7030653; Coropceanu V, 2006, CHEM-EUR J, V12, P2073, DOI 10.1002-chem.200500879; Degheili JA, 2009, J PHYS CHEM A, V113, P1244, DOI 10.1021-jp8098363; Fichou D., 1999, HDB OLIGO POLYTHIOPH; Gao P, 2010, CHEM-EUR J, V16, P5119, DOI 10.1002-chem.200903562; Hains AW, 2010, ACS APPL MATER INTER, V2, P175, DOI 10.1021-am900634a; Helgesen M, 2010, MACROMOLECULES, V43, P1253, DOI 10.1021-ma9024812; Horowitz G, 2004, J MATER RES, V19, P1946, DOI 10.1557-JMR.2004.0266; Kagan C. R., 2003, THIN FILM TRANSISTOR; KALYANASUNDARAM K, 1977, J AM CHEM SOC, V99, P2039, DOI 10.1021-ja00449a004; Lakowicz J. R., 1999, PRINCIPLES FLUORESCE; LIPPERT E, 1957, Z ELEKTROCHEM, V61, P962; MATAGA N, 1956, B CHEM SOC JPN, V29, P465, DOI 10.1246-bcsj.29.465; Miyazaki E, 2009, J MATER CHEM, V19, P5913, DOI 10.1039-b910824f; MIYAZAKI E, 2008, Patent No. 2008108442; Moustafa RM, 2009, J PHYS CHEM A, V113, P1235, DOI 10.1021-jp809830x; Parker C.A., 1968, PHOTOLUMINESCENCE SO; Reichardt C., 1988, SOLVENTS SOLVENT EFF; REICHARDT C, 1994, CHEM REV, V94, P2319, DOI 10.1021-cr00032a005; SARAF SD, 1974, J MATH SCI, V1, P75; Shinamura S, 2010, J ORG CHEM, V75, P1228, DOI 10.1021-jo902545a; Shyamala T, 2006, CHEM PHYS, V330, P469, DOI 10.1016-j.chemphys.2006.09.018; Singh TB, 2006, ANNU REV MATER RES, V36, P199, DOI 10.1146-annurev.matsci.36.022805.094757; Subuddhi U, 2006, PHOTOCH PHOTOBIO SCI, V5, P459, DOI 10.1039-b600009f; Wex B, 2006, J MATER CHEM, V16, P1121, DOI 10.1039-b512191d; Wex B, 2006, J PHYS CHEM A, V110, P13754, DOI 10.1021-jp065548s; Wex B, 2005, J ORG CHEM, V70, P4502, DOI 10.1021-jo048010w; Wex B, 2004, J ORG CHEM, V69, P2197, DOI 10.1021-jo035769j; Xia CJ, 2002, ORG LETT, V4, P2067, DOI 10.1021-ol025943a0
Gustav Ritter von Wex, sein Leben und Werk
No full textSummary: The regulation works of Danube river along Vienna city around 1870 are described as a monumental European project of the 19th century. The publications of the project head Gustav von Wex (1811-1892) are thereby reviewed, given that he therein considered the historical bases, the imperial decision, the project outline and the advances of the works. In addition, the scientific works of von Wex are also described and put into a historical context. Finally, the biography of von Wex is presented along with the problems in searching successfully his portrait. This historical work is intended to add to the early developments in river engineering of Europ
Altering the emission behavior with the turn of a thiophene ring: The photophysics of condensed ring systems of alternating benzenes and thiophenes
No full textSix aromatic compounds with embedded thiophenes differing in the number of rings (2-5) and thiophene orientation along the long axis of the molecule (syn, anti) were investigated. Photophysical properties, steady-state absorption, fluorescence, phosphorescence, lifetimes, quantum yields, and a comprehensive time-resolved spectroscopic analysis (femtosecond and nanosecond transient absorption spectroscopy) have been studied as a function of molecular structure. © 2006 American Chemical Society.Aaron JJ, 2002, J FLUORESC, V12, P231, DOI 10.1023-A:1016869002735; Abdel-Shafi AA, 2005, J PHOTOCH PHOTOBIO A, V172, P170, DOI 10.1016-j.photochem.2004.12.006; AGGARWAL N, 1979, ORG PREP PROCED INT, V11, P247; Becker RS, 1996, J PHYS CHEM-US, V100, P18683, DOI 10.1021-jp960852e; BEIMLING P, 1986, CHEM BER-RECL, V119, P3198, DOI 10.1002-cber.19861191025; Berlman I. B., 1971, HDB FLUORESCENCE SPE; BONNIER JM, 1970, J CHIM PHYS PCB, V67, P571; DAVYDOV SN, 1981, RUSS J PHYS CHEM, V55, P444; de Melo JS, 2003, J CHEM PHYS, V118, P1550, DOI 10.1063-1.1528604; de Melo JS, 2003, PHOTOCHEM PHOTOBIOL, V77, P121; Fichou D., 1999, HDB OLIGO POLYTHIOPH; FLICKER WM, 1976, J CHEM PHYS, V64, P1315, DOI 10.1063-1.432397; GENTILI PL, 2004, PHOTOCHEM PHOTOBIOL, V3, P881; Hadziioannou G, 2000, SEMICONDUCTING POLYM; Jabbarzadeh B, 1997, SPECTROSC LETT, V30, P1279, DOI 10.1080-00387019708006723; KIMURA O, 1988, Patent No. 63122727; Kunugi Y, 2004, J MATER CHEM, V14, P1367, DOI 10.1039-b401209g; Lap DV, 1997, J PHYS CHEM A, V101, P107, DOI 10.1021-jp961670n; Laquindanum JG, 1997, ADV MATER, V9, P36, DOI 10.1002-adma.19970090106; Luman CR, 2003, PHOTOCHEM PHOTOBIOL, V77, P510, DOI 10.1562-0031-8655(2003)0770510:LOFLIS2.0.CO;2; Meng H, 2005, J AM CHEM SOC, V127, P2406, DOI 10.1021-ja043189d; Merzlikine AG, 2004, PHOTOCH PHOTOBIO SCI, V3, P892, DOI 10.1039-b404580g; Murov S., 1993, HDB PHOTOCHEMISTRY; Nijegorodov N, 2001, SPECTROCHIM ACTA A, V57, P1449, DOI 10.1016-S1386-1425(00)00488-1; Pan HL, 2006, CHEM MATER, V18, P3237, DOI 10.1021-cm0602592; Perepichka IF, 2005, ADV MATER, V17, P2281, DOI 10.1002-adma.200500461; Perkampus H.-H, 1992, US VIS ATLAS ORGANIC; POMERANTZ M, 1994, MATER RES SOC SYMP P, V328, P227; Rentsch S, 1999, PHYS CHEM CHEM PHYS, V1, P1707, DOI 10.1039-a808617f; RYASHENTSEVA MA, 1988, IZV AKAD NAUK SSSR, V12, P2857; THYRION FC, 1973, J PHYS CHEM-US, V77, P1478, DOI 10.1021-j100631a002; TUROO N, 1991, MODERN MOL PHOTOCHEM; Wex B, 2006, J MATER CHEM, V16, P1121, DOI 10.1039-b512191d; Wex B, 2005, J ORG CHEM, V70, P4502, DOI 10.1021-jo048010w; Wex B, 2004, J ORG CHEM, V69, P2197, DOI 10.1021-jo035769j; WYNBERG H, 1970, J ORG CHEM, V35, P711, DOI 10.1021-jo00828a037; YOSHIDA S, 1994, J ORG CHEM, V59, P3077, DOI 10.1021-jo00090a027; ZANDER M, 1987, Z NATURFORSCH A, V42, P735; ZANDER M, 1985, Z NATURFORSCH A, V40, P497; ZANDER M, 1989, Z NATURFORSCH A, V44, P205119
ASH-WEX affects the distribution of events in the IMR-32 cell cycle.
No full text<p>IMR-32 cells were treated with 0.5% ASH-WEX and RA for 72 h (a). The evaluation of cell cycle progression was done by DNA staining by propidium iodide. The figure shows representative FACS profiles of the distribution of cells in G0/G1, S, and G2/M phases as analysed by FCS software. (b) Histogram represents percentage distribution of the cells in different phases (G0/G1, S, and G2/M) after ASH-WEX treatment as compared to control. (c) Flow cytometric examination of apoptosis, necrosis and cell viability-the Annexin V/PI assay. Diagrams show four subgroups of cells. Viable (Q1, annexin V-, PI-), early apoptotic (Q2, annexin V+, PI-), late apoptotic (Q3, annexin V+, PI+) and necrotic/damaged (Q4, annexin V-, PI+) are represented in different quadrants. (d) Histogram represents percentage distribution of the cells in different quadrants. “*” represents the statistical significant (p<0.05) difference between control and ASH-WEX treated groups.</p
Dissertatio physica, de sensibus externis: Quam divina assistente gratia: ex decreto [et] unanimi consensu venerandae [et] amplissimae facult: philosophicae, in Regia Fennorum Universitate, magnifico rectore, dn. m. Martino Stodio, ling. profess. publ. atq[ue] in Lundo past. dignissimo, spectabiliq[ue] decano, dn. m. Michaele O. Wexionio, philosoph: practicae & hist: prof: publ: eximio, moderatore dn. m. Georgio. C. Alano, physic. & botan. profess. celeberrimo, praeceptore & promotore suo aeternum colendo, pro gradu magisterij privilegijsq[ue] ejus consequendis, publico examini placid submittit Johannes M. Ketarmannus, Inferiori-Satacundiâ Fenningus. Ad diem 17. Martij anni 1647
No full textArkit: A-B4 C2.Dedicatio: Andreas Jacobi.Grat.: Michael O. Wex., Simon S. Kexlerus, Johannes E. Ters., Johannes H. Curnovius
Representative phase contrast images of control, 0.2% or 0,5% ASH-WEX and RA treated cells, in which motility was analyzed by Wound-scratch test (a).
No full text<p>Images show the starting (0 h after scratch) and the end (24 h after scratch) point of the analysis. (b) Graph shows that the rate of IMR-32 migration in response to ASH-WEX treatment in comparison to untreated cells. Data are obtained from a set of scratch test analysis (N = 3) and are expressed as means ± standard error. Representative MMP zymogram from control and treated samples and their densometery analysis is represented as histogram (c). mRNA expression for MMP2 and MMP9 was analyzed by RT-PCR. Relative percentage expression was expressed as histogram (d). “*” represents the statistical significant (p<0.05) difference between control and ASH-WEX treated groups.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Oxidative stress and DNA damage response as determined by staining of Reactive Oxygen Species (A) and γH2AX (B) in control and H<sub>2</sub>O<sub>2</sub> treated C6 cells.
No full text<p>Whereas H<sub>2</sub>O<sub>2</sub> treated cells showed increase in ROS and γH2AX, cells recovered either in the presence of i-Extract, withanone, WEX or combination of i-Extract and WEX showed decrease.</p
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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