Back-tracking

I am doing a certain amount of back-tracking given that this method was mentioned above when some results were quoted for tranition metals. 

Other functions such as can coding (lot numbers, line designation) must be considered a process step. Can coding is a means of identifying an unlabeled unit by lot number or code. It is usually done with an ink-jet labeler or similar device. Another coding system may differentiate between filling tracks (front, back) within one lot. For example, if needed, the back track may be coded with... 

The algorithm stops when the trees are completely covered by matches. After having computed the entire dynamic programming matrix, an optimal matching can be extracted using a back-tracking procedure to follow the path of the... 

Pursuing the back track, we find that the Due de Monttnorenci (bine blood) was executed by a falling axe at Toulouse, 1682 that the Dutch used it in executing slaves in their colonies, and that its use was comparatively common in Germany during the Middle Ages. 

The twist grain boundary smectic phase was discovered serendipitously at Bell Laboratories in 1987. Its discovery followed the back-tracking of a number of decisions made concerning the development of ferroelectric liquid crystals for display device applications. 

Operationally, to numerically construct a Poincare map, a number of initial conditions are chosen (they are often chosen uniformly on the Poincare map surface within the energetically allowed range of positions and momenta), and the trajectories are allowed to intersect the map many times. In praaice, the code must monitor whether a trajectory has crossed the surface, and then back-track to the surface with reasonable accuracy. The back-tracking can be carried out by a linear interpolation between the integration points immediately before and after the crossing, but this procedure lacks sufficient numerical accuracy for some applications. 

But large changes were in the offing. Proposals had been made to reorganise the SRC permanent laboratories, and these were about to be acted on. Their consequence for this story is the shifting of the computational chemistry focus from Atlas to Daresbury Laboratory, as mentioned above. But before going on to consider the developments after the change of location, it is useful to back-track a little and consider the chemical database work done at Atlas lab. 

Normally, few problems will be encountered with the use of the TLC or HPTLC products, but the chromatographer should routinely record any batch numbers on the packing of that product to allow back tracking with the manufacturer should this be... 

Well, I suppose that was easy enough to follow. Let s just backtrack a little now so that we can put the information we have had so far in its proper context. Certainly that equation for AP is simple enough to use, but how do we know if it is really valid for the fluid and the flow we are dealing with How do we know if the fluid is in turbulent flow, and for that matter, what is turbulent flow anyway Why are most fluids piped and pumped in turbulent flow To answer these questions, we have to back track a little, and so we should. Don t panic. Although there are many excellent and far, far more complete texts on this subject (to some of which we will refer), we will now attempt to give you a thumbnail sketch or "working guide."... 

For software, this kind of search is continued from the hardware, to the output registers of the computer, to the control flow in the software. Path tracing in software follows a simple back tracking algorithm, while the paths are traced, the "path predicates", that is, the input conditions allowing path to be followed, are collected. 

A history/fiiture structure is built in to permit back-tracking and forward-tracking allowing the programmer to change his or her mind. 

RNA synthesis is not monotonic, and RNA polymerases can move backward like DNA polymerases do for their editing function in which an incorrectly inserted deoxynu-cleotide is removed by 3 exonuclease activity. RNA polymerases stall, back track, and then cleave off multiple newly inserted nucleotides at the 3 terminus. Subsequently, polymerases move forward along the DNA template and resynthesize the cleaved region. Based on the segment of DNA covered by an RNA polymerase as analyzed by DNA footprinting, it has been proposed that the enzyme alternatively compresses and extends in its binding to the DNA template and acts like an inchworm in its transit. 

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