Jesse Francis McClendon

Jesse Francis McClendon (December 21, 1880 – November 22, 1976) was an American chemist, zoologist, and physiologist known for the first pH measurement of human stomach in situ.

McClendon made substantial contributions in a variety of fields, including invertebrate zoology, nutrition, life processes of cell membranes, the importance of pH control,[1][2][3] the role of iodine in human health, and specifically its relation to prevention of goiters.

It was also while working in this laboratory that McClendon achieved pioneering research, including his investigation of the relationship between low iodine and goiter.

The apparatus designed for work on the stomach contents consists chiefly of a rubber tube 60 cm.

40 silk covered copper wires, that were coated with rubber cement and dried several times.

The lower end of the glass tube and copper-platinum junction is covered with sealing wax, A.