نتایج جستجو برای: nmr spectrometer
تعداد نتایج: 79900 فیلتر نتایج به سال:
We have developed an easy to construct, non-resonant wideband NMR probe. The probe is of the saddle coil geometry and is designed such that the coil itself forms a transmission line. The probe thus requires no tuning or matching elements. We use the probe with a spectrometer whose duplexer circuitry employs a simple RF switch instead of the more common lambda/4 lines, so the entire probe and sp...
5. Radiochemistry 24 6. Laser scanning confocal microscopy 30 7. Two-photon excitation and fluorescence lifetime imaging microscopy 44 8. Kinetic stability testing in an aqueous environment 50 9. Stability assays to estimate kinetic stability against common biologically-relevant agents 55 10. In vivo imaging tests by microPET 62 11. Hypoxia selectivity testing 63 12. MTT assays 69 13. Cyclic vo...
General procedures and materials All experiments were carried out under argon of 99.998% purity using standard Schlenk line techniques or in a glovebox under nitrogen. All glassware was dried carefully by treatment with a heat gun under high vacuum or in an oven at 90◦C overnight. Solvents were dried and distilled under argon prior use. Ethers were dried over Na/ benzophenone, pentane and CH2Cl...
Materials. All chemicals were purchased from commercial sources (Sigma-Aldrich or Acros) and used without further purification unless otherwise stated. 4,8-Bis(alkoxy)benzo[1,2-b:4,5-b’]dithiophene (1a and 1b) and 4,6dibromothieno[3,4-b]thiophene-2-carboxylic acid (3) were synthesized according to the reported procedure[35]. Characterization. 1H and 13C NMR spectra were recorded with on a Bruke...
Photochemically induced dynamic nuclear polarization (photo-CIDNP) is a method to hyperpolarize spins using light. In most cases, CIDNP experiments are performed in high magnetic fields and the sample irradiated by light inside resonance (NMR) spectrometer. Here we demonstrate photo-CIDNP hyperpolarization generated Earth’s field under zero- ultralow-field (ZULF) conditions. Irradiating contain...
Materials and General Considerations. Unless noted otherwise, all manipulations of ruthenium complexes were carried out under an inert atmosphere using standard glovebox or Schlenk techniques. Toluene was distilled from sodium under argon. Demineralised water was distilled under nitrogen and degassed three times after distillation. Ruthenium alkylidenes 2 and 3 were supplied by Aldrich. NMR spe...
In this study, we report the spin-lattice relaxation rate of hepatocellular carcinoma (HCC) and normal liver tissue in rats using a high-T(c) superconducting quantum interference device (SQUID) based nuclear magnetic resonance (NMR) spectrometer. The resonance spectrometer used for discriminating liver tumors in rats via the difference in longitudinal relaxation time in low magnetic fields was ...
23.5 g (81.2 mmol) Irgasan and 7.78 g (77 mmol) triethylamin (99%, Acros Organics, Geel, Belgium) were dissolved in 350 ml tetrahydrofuran (stabilized, Acros Organics), extra dried over molecular sieve, water content< 50 ppm in a 1-l three-necked flask with reflux condenser. The solution was cooled to 0°C and 7.71 g (73.8 m mol) methacryloyl chloride (> 97%, Sigma Aldrich GmbH, Taufkirchen, Ger...
Access to an ultra-wide bore (105 mm) 21.1 T magnet makes possible numerous advances in NMR spectroscopy and MR imaging, as well as novel applications. This magnet was developed, designed, manufactured and tested at the National High Magnetic Field Laboratory and on July 21, 2004 it was energized to 21.1 T. Commercial and unique homebuilt probes, along with a standard commercial NMR console hav...
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