1,720,964 research outputs found
Mn(III)-Tetraarylporphyrins bearing a covalently anchored axial ligand: efficient catalyst in olefin epoxidation under two-phase conditions.
No full textSYNTHESIS, CHARACTERIZATION, AND 1/T(1) NMRD PROFILES OF GADOLINIUM(III) COMPLEXES OF MONOAMIDE DERIVATIVES OF DOTA-LIKE LIGANDS - X-RAY STRUCTURE OF THE 10-[2-[[2-HYDROXY-1-(HYDROXYMETHYL)ETHYL]AMINO]-1-[(PHENYLMETHOXY)METHYL ]-2-OXO-ETHYL]-1,4,7,10-TETRAAZACYCLODODECANE-1,4,7-TRIACETIC ACID GADOLINIUM(III) COMPLEX
No full textMagnetic Resonance Contrast Agents: From the Bench to the Patient.
No full textMagnetic Resonance Imaging is gaining a prominent role in the routine clinical investigation. To further improve this technique it is crucial that contrast agents are developed with more optimal organ specificity. This will not only result in a better diagnostic efficiency but also in a reduction of the amount of the agent administered. A combination of techniques has been employed to increase the target selectivity of the contrast agent and thereby the feasibility to visualize different organs. The organ targeting is based on the understanding of the mechanisms involved in the interaction of the agent with plasma proteins (albumin in particular) as well as the different membrane transporters involved in the uptake and in the excretion of the agent from the organ. The physicochemical properties of the contrast agents play a major role in the interaction with these various proteins. In this review we address the relationship between the structure of the contrast agents and their binding to different plasma proteins and membrane transporters in different organs, with special reference to the liver and kidney. The present and potentially future applications of these concepts in the clinical setting are also discussed
Molecular determinants in the transport of a bile acid derived diagnostic agent in tumoral and non-tumoral cell lines of human liver.
No full textContrast-enhanced magnetic resonance imaging (CE-MRI) is a valuable technique for the diagnosis of liver diseases. As gadocoletic acid trisodium salt (B22956/1), a new contrast agent showing high biliary excretion, may be potentially advantageous in hepatobiliary imaging, the aim of the study was to investigate the molecular mechanisms of hepatic transport of the B22956 ion in a cellular model of hepatic tumor. B22956 ion uptake was measured in tumoral (HepG2) and nontumoral (Chang liver) hepatic cell lines. Absolute quantitative real-time reverse transcriptase (RT)-polymerase chain reaction (PCR) analyses, using cloned PCR products as standards, were performed on total RNA of both cell lines and normal liver to evaluate the transcription of 12 transport genes: SLCO1A2, SLCO2B1, SLCO1B1, SLCO3A1, SLCO4A1, SLCO1B3, SLC22A7, SLC22A8, SLC22A1, SLC10A1, SLC15A1, and SLC15A2. B22956 transport was more efficient in Chang liver than in HepG2 cells and was inhibited by cholecystokinin-8, a specific substrate of OATP1B3. Real-time RT-PCR analyses revealed different transcription profiles in the tumoral and nontumoral cell lines. Compared with normal liver, the expression of SLCO1B1, SLCO3A1, and SLCO1B3 was greatly repressed in HepG2 cells, whereas SLCO2B1, SLC22A7, and SLC22A8 expression was either maintained or increased. On the contrary, in Chang liver cells, SLC22A7 and SLC22A8 genes were undetectable, whereas the expression of SLCO3A1, SLCO4A1, and SLCO1B3 was similar to normal liver. Transport studies and gene expression analyses indicated that B22956 ion is a good substrate to the liver-specific OATP1B3, reported to be poorly expressed or absent in human liver tumors. Therefore, B22956 may be helpful in detecting hepatic neoplastic lesions by CE-MRI
IN VIVO AND IN VITRO HEPATIC TRANSPORT OF THE MAGNETIC RESONANCE IMAGING CONTRAST AGENT B ROLE OF MRPS.
No full text
PROCESS FOR THE PREPARATION OF A IODINATING AGENT
No full textThe present invention describes a process for the synthesis of a iodinating agent, being said iodinating agent iodine chloride (ICl). In particular, the present invention relates to a process for the electrochemical preparation of ICl, as a useful iodinating agent in the preparation of iodinated organic compounds for use as contrast agents or they precursors in the synthesis of the same
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
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