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But as will seen later such negative evidence in the case any hydroxy pyridine derivative can not regarded as conclusive. The first the curative substances tested was a hydroxy pyridine. Three birds were treated with excellent speech writing services online results.

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Three others, however, showed little or no improvement.

On proceeding with the series the polyhydroxy compounds a rapid striking cure was obtained with a preparation, trihydroxy pyridine, followed several partial or complete custom essay writers failures.

A second and third fresh preparation, however, produced two and three fairly rapid cures, respectively.

A single fresh preparation, trihydroxy pyridine was administered three pigeons simultaneously, one pigeon receiving milligrams, the second milligram, and the third one-half milligram.

The following morning the first bird was dead, while the second and third had completely recovered from all paralytic symptoms.

In each case all the cures obtained were those pigeons which were first treated with a given preparation, while those treated with the same preparation a few days or weeks later invariably received no benefit. It was obvious that the substances had changed in some manner as lose the curative power. As there was no evidence decomposition, seemed probable that was due a tautomeric change that a rearrangement the grouping the atoms without any actual disruption the molecule into simpler substances.

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Such rearrangements are well known in many chemical substances, and have greatly interested oiganic chemists for the past decade. No emphasis has been laid the possibility a biological significance such transformations, though they appear just such reactions as might easily occur within the animal organism. M them buy dissertation paper take place with the greatest easo and without resort the violent methods ordinarily employed in our laboratories. The existence such a tautomerism in the hydroxy pyridines has long been recognized in a general way. It has been observed that these substances under certain circumstances react as hydroxy or enol compounds, under others as ketones. However, no one has regarded possible that the two forms cheap resume writing services could exist help in writing a research paper in a free isolated state as two distinct individuals. Each the hydroxy pyridines described in the literature as one substance definite though dual properties. ghost writing service A critical examination the literature, however, suggested that this was not the case. It was therefore decided study the tautomerism some one the curative substances more thoroughly than had been done previously. For this purpose a hydroxy pyridine was chosen. This substance has been administered about pigeons under varying conditions and certain important facts have come light. It prepared fusing hydroxy nicotinic acid and distilling the residue after education dissertation topics the evolution carbon dioxide has ceased. The oily distillate presently phd thesis for sale solidifies a mass largely made prism crystals but often containing a few needle forms. The residue condensing in the neck the distilling flask after completion the process always crystallizes in the form needles. 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