History of food chemistry The scientific approach to food and nutrition arose with attention to agricultural chemistry in the works of J. G. Wallerius, Humphry Davy, and others. For example, Davy published Elements of Agricultural Chemistry, in a Course of Lectures for the Board of Agriculture (1813) in the United Kingdom which would serve as a foundation for the profession worldwide, going into a fifth edition.
A chancre (/ËÊaeÅkÉr/ ËÊÃ¦ÅKÉR-shang) kÉr is a painless (ulceration) sore most commonly formed during the primary stage of. syphilisifferences between the conditions chancre and chancroid 1  : Chancre is a lesion typical of infection with the bacterium that causes syphilis, Treponema pallidum. 2  Chancroid is a lesion typical of infection with the bacterium Haemophilus ducreyi. 3  Chancres are typically painless, whereas chancroid are typically painful.
Chancre: The classic painless ulcer of syphilis. The chancre forms in the first (primary) stage of syphilis. It is highly contagious and can last 1-5 weeks. The disease can be transmitted from contact with the ulcer, which is teeming with spirochetes. If the ulcer is outside of the vagina or on the scrotum of the male, the use of condoms may not help in preventing transmission of the disease.