Inaccessible regions

In inaccessible regions where an impressed current installation is not sufficiently close to a low voltage supply, the protection current can be supplied from batteries, thermogenerators, and if there is sufficient radiation from the sun, solar cells. Wind generators and diesel units, on the other hand, are less suitable because of the maintenance necessary for continuous operation. 

Figure 2. Theoretical displacement isotherms for various values, calculated from the Roe theory Athermal systems (Ax = 0, Xpd = 0). The dotted line is the extrapolation of the isotherm into the physically inaccessible region...

The accessibility of the OH groups in cellulose is 96-99% when nitrated with mixed acids. The accessibility of 0N02 in cellulose trinitrate on denitration is only ca. 70%. The latter value is much lower than the former because of the much higher crystallinity of the trinitrate compared with that of the lower substituted cellulose nitrates. The difference may explain why the rate of nitration is higher than that of denitration. The inaccessible regions in the nitration are to be attributed to cellulose junction points and in the denitration of cellulose trinitrate to trinitrate junction points . 

A novel pump-damp-probe method (PDPM), which allows the characterization of solvation dynamics of a fluorescence probe not only in excited but also in the ground states has been recently developed (Changenet-Barret, 2000 and references therein). In PDPM, a pump produces a nonequilibrium population of the probe excited, which, after media relaxation, is simulated back to the ground states. The solvent relaxation of the nonequlibrium ground state is probed by monitoring with absorption technique. The inramolecular protein dynamics in a solvent-inaccessible region of calmodulin labeled with coumarin 343 peptide was examined by PDPM. In the pump-dump-probe experiments, part of a series of laser output pulses was frequency-doubled and softer beams were used as the probe. The delay of the probe with respect to the pump was fixed at 500 ps. 

In indirect calibration there is inevitably some loss of accuracy in using a separate bulb, but there is also the opportunity to use a glass bulb which can be properly cleaned. Any gas bubbles can be seen and withdrawn, and also there are no inaccessible regions in the vicinity of metal fittings and valves. 

L. Are there Inaccessible Regions in Hair, and Why Are They Important ... 

These data suggest that, at least at the micron level (using 20x or 40x objectives), there are no inaccessible regions. Incorporation at the molecular level is not ruled out by these data, although stoichiometric considerations may suggest otherwise. ... 

Model of drug distribution consistent with inaccessible regions. For clarity, the drug concentration in the hair cross section is modeled as discrete steps of concentration. A more appropriate model may be a continuous gray scale representing a continuous concentration gradient of the drug. 

But many who chose this route to the hitherto inaccessible regions of the human mind later regretted then-decision De Quincey was not the only one to experience the agony of addiction. Their experiences in opiate hell led to the search for some other drag, some other type of chemical concoction with opium s desirable effects, yet free of its nightmarish properties. 

The significance of vibrational optical activity becomes apparent when it is compared with conventional electronic optical activity in the form of optical rotatory dispersion (ORD) and circular dichroism (CD) of visible and near-ultraviolet radiation. These conventional techniques have proved most valuable in stereochemistry, but since the electronic transition frequencies of most structural units in a molecule occur in inaccessible regions of the far-ultraviolet, they are restricted to probing chromophores and their immediate intramolecular environments. On the other hand, a vibrational spectrum contains bands from most parts of a molecule, so the measurement of vibrational optical activity should provide much more information. 

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