Screen mode

CTSCREEN is the screening mode of CTDMPLUS. Refer to CTDMPLUS above for all document information for diis model. 

This button initiates a Split-Screen mode in the window. In the upper trace the full spectrum is always visible and a black box indicates that part of the spectrum, which has been expanded and is visible in the lower trace. 

Analysis methodologies for the two different screening modes are discussed,... 

The operator s attention is still necessary during continuous screening modes, and he or she can be alerted via email or telephone of problems arising during off hours. Cooperation between assay development scientists and robotic engineers is required for reagent preparation and trouble shooting. Some of the operational issues of fully automated robotic systems include ... 

In the 128 mode, the 40/80 DISPLAY key selects which screen mode is used as the default. This key is checked at power-on, when RUN/STOP-RESTORE is pressed, or when the RESET button (found next to the power switch) is pressed. This key has no meaning in 64 mode since 80 columns are not available, again for the sake of compatibility. In either 128 or CP/M mode, the same VIC chip used on the 64 displays 40 columns, graphics, and sprites. The 40-column screen can be seen only on a television or composite monitor, not on the RGB display. 

There are three ways to switch between 40 and 80 columns toggle the 40/80 switch and press RUN/STOP-RESTORE, press ESC-X in BASIC, or enter the command SCREEN 0 for 40 columns, or SCREEN 5 for 80 columns. Remember that these screens are independent. If you have two monitors hooked up, these commands reroute screen printing to the appropriate monitor (although both screens remain displayed). Commodore s 1902 monitor is ideal for the 128 it has built-in color composite video, split-signal composite video (as used on the rear connections of the 1701/ 1702 monitor), IBM-compatible RGB, and analog RGB (for use with the Amiga). With the 1902, you must manually flip a switch after you change screen modes. 

It is used in combination with square wave anodic stripping voltammetry (SWASV) using a PalmSens portable instrument (Palm Instrument BV, Houten, The Netherlands) for the measurement of metals such as Cu (II), Cd (II) and Pb (II) (labile metallic complexes and free metals) in water. These disposable sensors require no calibration for use in the screening mode, so, many samples may be tested for the presence or the absence of metals in water. The quantification can also be performed using the standard addition method in less than 15 min. 

O) c 1 l> 4). S o Rapid Screening Mode Rapid Screening Mode... 

Detector E, Environmental Sciences Assoc. Coulochem II, Model 5011 detector cell, oxidative screen mode, screen electrode -1-0.25 V, sample electrode -1-0.5 V... 

In taking the reaction out of screening mode and into lab-scale experimentation, the reaction showed some irreproducibility. After a brief investigation, two factors were determined to be important for consistency (1) the formation of the potassium salt of bromoindole 119 prior to coupling, and (2) water... 

Spending amperometric electrodes ( screen mode , Sect. 3.2), and the large electrodes are not contaminated as easily as the smaller disc electrodes. On the other hand, porous electrodes cannot be replaced. They are cleaned by flushing the cell with a nitric acid solution and organic solvents. One should also take care in connecting coulometric cells after spectroscopic detectors, as the backpressure resulting from porous electrodes may harm optical flow cells. 

TL, thin-layer cell equipped with a glassy carbon electrode WJ, wall-jet cell equipped with a glassy carbon electrode CO-screen coulometric cell with dual-electrodes of porous graphite used in screen mode PAD, pulsed amperometric detector equipped with a gold electrode. 

Hordenine was detected with a dual-electrode coulometric cell. The potential of the first electrode was set to -I-0.50V [vs. solid palladium reference electrode (Pd)], which was at the base of hordenine s hydro-dynamic voltammogram. This electrode cleaned the sample by removing easily oxidizable impurities. Hordenine and its precursors were subsequently detected by a second electrode at a potential of -I-0.75V. This method of detection is called the screen mode . In addition, the mobile phase was purified by connecting a coulometric cell between the pump and injector as a guard cell. This additional cell operated at +0.80 V. The detection limit of hordenine was at 1.1 ng, which was 25 times better than detection by UV at 275 nm. 

Based on these electrochemical studies we developed a method for the quantitation of ajmalicine and catharanthine in cell cultures. These alkaloids were extracted from freeze-dried cells and purified by the solid-phase procedure described by Morris et al. (1985), except that ethanol was used as the extracting solvent instead of methanol. A dual-electrode coulometric cell was used in the screen mode. The potential of the first electode was set at +0.2 V (vs. Pd), which was at the base of catharanthine s voltammogram. The alkaloids were detected by the second electrode at +0.8 V, as this offered the best S/N ratio. Higher potentials led to lower S/N ratio, since the background current and noise started to increase exponentially above +0.85 V, due to the oxidation of water. The mobile phase was purified by a guard cell between the pump and injector. The guard cell operated at +0.8V. 

In a subsequent study, the DemixC method was appHed to a mixture of D-glucose, L-histidine, L-lysine, serotonin hydrochloride, D-sorbitol as well as to the venom of the walking stick insect Anisomorpha buprestoides, which consists of at least six compounds [84]. The H—H TOCSY spectra of 2048 X 512 points were recorded in a screening setup at 600 MHz with a 1 mm probehead. With the help of databases, the mixture was deconvolved and the venom identified. Thus, automated mixture deconvolution in screening mode using covariance processed H—H TOCSY experiments was found feasible. 

Coulochem cells with dual PGEs can be operated in three modes, often referred to as screen , difference and redox .In screen mode the potential of the first electrode (Ei) in the analytical cell is set, typically, 0.2-0.3 V below that of... 

Figure 3.11 Chromatograms obtained using the ESA Coulochem in screen mode (PGEs, Ej +0.6 V, E2 +0.9 V v5 Pd). Column 150x4.6 (i.d.) mm Spherisorb S5CN cyanopropyTmodified silica Eluent acetonitrile-aq. phosphoric acid (14 mmol L ) (30+70). Flow-rate 0.8 mL min Injections (a) 50 xL aqueous 2-methylaniline (1) (0.01 mg IT ) and prilocaine (2) (1 mg L ) (b) 50 J,L aqueous 3-hydroxylignocaine (3) (0.1 mg L ) and lignocaine (4) (1 mg L ).

Lometrexol (Figure 6.4) has been measured in plasma by HPLC-ED using a phenyl-modified silica analytical column with acetonitrile-aq. sodium acetate (50mmolL pH 4.0) as eluent and detection at PGEs in the screen mode (Ei +0.4V, E2 +0.9V, vs Pd). Plasma (ImL) plus internal standard (LY277413, Figure 6.4) was extracted by SPE (aromatic sulfonic acid-modified silica column). The LoD was 5 pgL ... 

---