Karl Bernhard Lehmann was a German hygienist and bacteriologist born in Zurich

Zürich

Zurich is the largest city in Switzerland and the capital of the canton of Zurich. It is located in central Switzerland at the northwestern tip of Lake Zurich...

. He was a brother to publisher Julius Friedrich Lehmann (1864-1935).

Lehmann studied medicine at the University of Munich, where one of his instructors was Max von Pettenkofer (1818-1901). In 1886 he received his habilitation, and from 1894 to 1932 was a professor of hygiene

Hygiene

Hygiene refers to the set of practices perceived by a community to be associated with the preservation of health and healthy living. While in modern medical sciences there is a set of standards of hygiene recommended for different situations, what is considered hygienic or not can vary between...

 at the University of Würzburg

University of Würzburg

The University of Würzburg is a university in Würzburg, Germany, founded in 1402. The university is a member of the distinguished Coimbra Group.-Name:...

.

He is remembered for pioneer toxicological

Toxicology

Toxicology is a branch of biology, chemistry, and medicine concerned with the study of the adverse effects of chemicals on living organisms...

 research he performed with Ferdinand Flury (1877-1947), of which the exposure limits of various substances encountered in the workplace were tested and defined. Their research formed a basis of what would later be known as MAK values

Threshold Limit Value

The threshold limit value of a chemical substance is a level to which it is believed a worker can be exposed day after day for a working lifetime without adverse health effects. Strictly speaking, TLV is a reserved term of the American Conference of Governmental Industrial Hygienists...

 (Maximale Arbeitsplatz-Konzentration) in Germany.

In the field of microbiology

Microbiology

Microbiology is the study of microorganisms, which are defined as any microscopic organism that comprises either a single cell , cell clusters or no cell at all . This includes eukaryotes, such as fungi and protists, and prokaryotes...

he was co-author with Rudolf Otto Neumann (1868-1952) of Atlas und Grundriss der Bakteriologie, a manual/textbook which over several editions described a number of new bacterial species.

Written works

• Atlas und Grundriss der Bakteriologie und Lehrbuch der speziellen bakteriologischen Diagnostik (Edition 1: Munich- 1896, from Edition 7- 1926-27: Bakteriologie, insbesondere bakteriologische Diagnostik); (with Rudolf Otto Neumann)
• Zur Psychologie und Hygiene der Genussmittel Würzburg, 1912
• Gutachten des Reichs-Gesundheitsrats, betreffend die Abwässerbeseitigung der Stadt Offenbach a. Main Berlin, 1913
• Die Bedeutung der Chromate für die Gesundheit der Arbeiter Berlin, 1914
• Kurzes Lehrbuch der Arbeits- und Gewerbehygiene Leipzig, 1919
• Die deutsche Bleifarbenindustrie vom Standpunkt der Hygiene Berlin 1925
• Der Staub in der Industrie, seine Bedeutung für die Gesundheit der Arbeiter und die neueren Fortschritte auf dem Gebiete seiner Verhütung und Bekämpfung Leipzig 1925
• Über die Gesundheitsverhältnisse der Arbeiter in der deutschen keramischen insbesondere der Porzellan-Industrie mit besonderer Berücksichtigung der Tuberkulosefrage Berlin 1929
• Frohe Lebensarbeit (Lebenserinnerungen) Münich, 1933
• Toxikologie und Hygiene der technischen Lösungsmittel Berlin, 1938 (with Ferdinand Flury)