Static cell

Many optical studies have employed a quasi-static cell, through which the photolytic precursor of one of the reagents and the stable molecular reagent are slowly flowed. The reaction is then initiated by laser photolysis of the precursor, and the products are detected a short time after the photolysis event. To avoid collisional relaxation of the internal degrees of freedom of the product, the products must be detected in a shorter time when compared to the time between gas-kinetic collisions, that depends inversely upon the total pressure in the cell. In some cases, for example in case of the stable NO product from the H + NO2 reaction discussed in section B2.3.3.2. the products are not removed by collisions with the walls and may have long residence times in the apparatus. Study of such reactions are better carried out with pulsed introduction of the reagents into the cell or under crossed-beam conditions. 

Ayuttaya, P.C.N., Rogers, T.N., Muhins, M.E., Kline, A.A. (2001) Henry s law constants derived from equilibrium static cell measurements for dilute organic-water mixtures. Fluid Phase Equil. 185, 359-377. 

Moscinski L, Atadja P, Bhalla K (2004) Superior activity of the combination of histone deacetylase inhibitor LAQ824 and the FLT-3 kinase inhibitor PKC412 against human acute myelogenous leukemia cells with mutant FLT-3. Clin Cancer Res 10 4991 997 Bali P, Pranpat M, Bradner J, Balasis M, Fiskus W, Guo F, Rocha K, Kumarawsamy S, Boyapalle S, Atadja P, Seto E, Bhalla K (2005) Inhibition of histone deacetylase 6 acetylates and disrupts the chaperone function of heat shock protein 90 a novel basis for antileukemia activity of histone deacetylase inhibitors. J Biol Chem 280(29) 26729-26734 Bannister AJ, Schneider R, Kouzarides T (2002) Histone methylation Dynamic or static Cell 109 801-806... 

Waterborg, J.H. (1990) Dynamic methylation of alfalfa histone H3. J. Biol. Chem. 268, 4918 921. Bannister, A., Schneider, R., and Kouzarides, T. (2002) Histone methylation dynamic or static Cell 109, 801-806. 

Figure 2.7 Vibrational excitation spectra in the region of the fundamental N-H and C-H symmetric stretches of pyrrole (a) photoacoustic Raman spectrum in a static cell at a pressure of 6.5 Torr and (b) H action spectrum obtained by 243.135 nm dissociation of jet-cooled molecules at a delay of 10 ns between the SRS and UV beams. The intensity scale of each panel is different. Reproduced with permission from Ref. [87]. Copyright (2011) AlP Publishing LLC.

The ISO (International Standards Organization) suspended sample test (3d), now adopted as MCC-1 by the U.S. Dept, of Energy Materials Characterization Center,(7) and the Sanders static cell test (8,9)(3f) make it possible to control the critical variables needed for kinetics analysis. Addition of tubing to and from the chambers in 3d and 3f is straightforward and enables corrosion to be studied as a function of flow rate. 

The experimental and data reduction procedures are essentially the same as for the static cell experiments. The gas temperature is obtained using a fine wire, radiation-corrected thermocouple. The cold mixing layer at each flame boundary is accounted for by using an effective pathlength (8.0 - 8.2 cm, depending on the fuel-air equivalence ratio) which differs slightly from the actual burner length of 8.6 cm. Fuel-air equivalence ratios of... 

Static cell Two phases contained without agitation Irreproducible, subject to ill defined and large diffusion layers, and stray vibrations of the apparatus. 

Capillary cell As for static cell, but use a capillary Capillary prevents spurious agitation interfering, analytically difficult... 

Phase equilibrium measurements with supercritical SC-CO2 as solvent were performed with a variable volume static cell, Riha 1996. Isotherms and partition coefficients were determined for 13 oils. Each oil represents a separation product. 

P-selectin Static Cell Adhesion Assay Formats... 

These factors clearly influence plasma formation, the requirements for which depend on whether the GD source is of the rf or dc type and also on the detection technique to which the GD is coupled. As early as 1976, Gough [177] reported improved direct solid atomic absorption analysis achieved by using a flowing gas instead of a static cell and... 

Reverse micelle solutions of known concentration were prepared in 2 mL constant volume 2.5 inch o.d. by 5/8 inch i.d. stainless steel cells fitted with 1" diameter x 3/8 thick sapphire windows. The path length was 1 cm. The cell was equipped with cartridge heaters and thermostated to 0.1 C by means of a platinum resistance thermometer and a temperature controller. A 60 mL syringe pump pressurized the system, and pressure was controlled to 0.2 bar. The surfactant and pyridine-N-oxide were introduced into the static cell as solutions in volatile solvents, so that concentrations were known to 1 %. The solvent was removed by volatilization and water, if needed, was added with a syringe. Experiments were always performed in the order of increasing pressure so that the overall molarities of surfactant, water, and pyridine-N-oxide were constant. 

The regenerative capacity of cells allows them to be classified into three groups labile, stable (or expanding), and permanent (or static) cells. Labile cells continue to proliferate throughout life stable cells retain this capacity but do not normally replicate and permanent cells cannot reproduce themselves... 

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