As lead combines with sulfhydryl groups it is possible that the presence of undue concentratiors of lead in the tissues might result .in at least a partial inactivation of this enzyme.

As lead combines with sulfhydryl groups it is possible that the presence of undue con centrtiors of lead in the tissues might result .in at least a partial inactivation of this enzyme.

Ray- Address: //Miami Address: Miami Subject: Medical Study, Tetra-ethyl Lead Date: January 3, 1950 Sometime in the very near future our Medical Department, working with the Kettering Laboratory of Cincinnati, will make a complete study of certain mechanical personnel for possible lead contamination.

Joseph Lead Co.

Lead driers are desirable in paints which do not contain lead as a basic component.

In my opinion, no one la In a position to make an interpre tation of results obtained except the person who has studied the case and has also been responsible for the lead analyses, I have received a varied amount of corres pondence during the past year importing to me clinical cases with various types of lead analyses, The quantities of lead which have been reported'J^veyvaried from 0 (which of course means a relatively unsatisfactory method) up-.to amounts so large as to be physiological impossible, (this meaning,of course, gross contamination of the samples)* Very few persons seem to have much idea of the precautions which are required to obtain good samples, and of the physiological considerations which it is needswary to take into account in interpreting an analytical result, I am therefore, skeptical about the usefulness of such data as they are ordinarly obtained* Certainly, if you Intend to sfet up a policy of regarding analytical findings as useful aide in diagnosis, you should clafcify your position by stating definitely that (1) abnormal amounts of lead in blood, tissues, or excreta, are useful only in establishing the occurrence of abnormal lead exposure; and (2) that they can be regarded as useful only vihen accompanied by careful clinical study of the disease* In addition to that, you should establish a proper basis for reservation with regard to tha accuracy of analyses obtained In Various laboratories N 5981 2 on the basis of the precise knowledge of the manner in which the analyses have been done.

These daughters rapidly decay to lead-210 in the respiratory passages.

Ray Subject: Medical Study, Tetra-ethyl Lead Address: /Miami / Address: Miami Date: ,January 3 1950 Sometime in the very near future our Medical Department, working with the Kettering Laboratory of Cincinnati, will make a complete study of certain mechanical personnel for possible lead contamination.

Inquiry of July 30, 1957, regarding the use of red lead palate oa interior surfaooa of potable eater tanks* lie foal that red lead is undo* sirabla fur suolt use beosuse of the possible increase in the lead oeatent of the eater.

For years, gasoline and solvent storage tanks were painted black, gray or red lead.

Serial analyses of the blood of normal healthy Individuals in our population, exclusive of those employed In lead trades cr otherwise exposed abnormally to lead compounds, yield results which ran ge from slightly under 0.01 up to and including 0.06 milligram of lead per 100 grams of whole blood.

Cardiovascular Changes in Lead Workers Le alterazioni cardiovascolari nei lavoratori del piombo M.

^iiitrt nn irrintr* Pt ml n .V * LEAD INDUSTRIES ASSOCIATION, INC.

^iiitrt nn irrintr* Pt ml n .V * LEAD INDUSTRIES ASSOCIATION, INC.

Secondly, do you have information relating to normal lead excretion rates under calcium Ve:rsenate stimulation in those presumably without unusual recent lead exposure>?