Karl Weigert, Carl Weigert (19 March 1845 in Münsterberg in

Silesia Silesia (, also , ) is a historical region of Central Europe that lies mostly within Poland, with small parts in the Czech Republic and Germany. Its area is approximately , and the population is estimated at around 8,000,000. Silesia is split ...

– 5 August 1904 in

Frankfurt am Main Frankfurt, officially Frankfurt am Main (; Hessian: , "Frank ford on the Main"), is the most populous city in the German state of Hesse. Its 791,000 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located on its na ...

) was a German

Jewish Jews ( he, יְהוּדִים, , ) or Jewish people are an ethnoreligious group and nation originating from the Israelites Israelite origins and kingdom: "The first act in the long drama of Jewish history is the age of the Israelites""The ...

pathologist Pathology is the study of the causal, causes and effects of disease or injury. The word ''pathology'' also refers to the study of disease in general, incorporating a wide range of biology research fields and medical practices. However, when us ...

. His nephew was

Fritz Weigert Fritz Weigert (18 September 1876 – 13 April 1947) was a German physical chemist. Weigert has made major contributions in the field of photochemistry. He was born in Berlin. He was the nephew of both Karl Weigert and Paul Ehrlich. He was married ...

and his cousin was

Paul Ehrlich Paul Ehrlich (; 14 March 1854 – 20 August 1915) was a Nobel Prize-winning German physician and scientist who worked in the fields of hematology, immunology, and antimicrobial chemotherapy. Among his foremost achievements were finding a cure ...

. He received his education at the universities of

Berlin Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constitue ...

Vienna en, Viennese , iso_code = AT-9 , registration_plate = W , postal_code_type = Postal code , postal_code = , timezone = CET , utc_offset = +1 , timezone_DST ...

, and Breslau, graduating in 1868. After having taken part in the Franco-Prussian war as assistant surgeon, he settled in Breslau, and for the following two years, was an assistant to Heinrich Waldeyer; from 1870 to 1874 to

Hermann Lebert Hermann Lebert (born ''Hermann Lewy'', 9 June 1813 – 1 August 1878) was a German physician and naturalist. Lebert was born in Breslau. He studied medicine and the natural sciences first in Berlin and later in Zurich under Johann Lukas Sch� ...

, and then to

Julius Cohnheim Julius Friedrich Cohnheim (20 July 1839 – 15 August 1884) was a German-Jewish pathologist. Biography Cohnheim was born at Demmin, Pomerania. He studied at the universities of Würzburg, Marburg, Greifswald, and Berlin, receiving his doctoral deg ...

, who he followed to the

University of Leipzig Leipzig University (german: Universität Leipzig), in Leipzig in Saxony, Germany, is one of the world's oldest universities and the second-oldest university (by consecutive years of existence) in Germany. The university was founded on 2 Decemb ...

in 1878. There he became an associate professor of pathology in 1879. In 1884, he was appointed professor of pathological anatomy at the Senkenbergsche Stiftung in

, and received the title of "Geheimer Medizinal-Rat" in 1899. He is buried in Old Jewish Cemetery, Frankfurt (Juedischer Friedhof Rat-Beil-Straße). Weigert assisted Cohnheim in many of his researches, and wrote much on the

staining Staining is a technique used to enhance contrast in samples, generally at the microscopic level. Stains and dyes are frequently used in histology (microscopic study of biological tissues), in cytology (microscopic study of cells), and in the ...

bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among ...

microscopy Microscopy is the technical field of using microscopes to view objects and areas of objects that cannot be seen with the naked eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of micr ...

. In 1884, he introduced a precise method for staining

myelin sheaths Myelin is a lipid-rich material that surrounds nerve cell axons (the nervous system's "wires") to insulate them and increase the rate at which electrical impulses (called action potentials) are passed along the axon. The myelinated axon can be l ...

. He is credited with the discovery of vascular

tuberculosis Tuberculosis (TB) is an infectious disease usually caused by '' Mycobacterium tuberculosis'' (MTB) bacteria. Tuberculosis generally affects the lungs, but it can also affect other parts of the body. Most infections show no symptoms, in ...

, and was the first to demonstrate how tuberculous material could enter the bloodstream.Professorenkatalog der Universität Leipzig
(biography) He contributed many essays to medical journals. Among his works are: * "Zur Anatomie der Pocken" (Breslau, 1874). * "Färbung der Bacterien mit Anilinfarben" (ib. 1875). * "Nephritis" (Leipzig, 1879). * "Fibrinfärbung" (1886). * "Beiträge zur Kenntniss der Normalen Menschlichen Neuroglia" (Frankfort am Main, 1895). * "Elastische Fasern" (ib. 1898).

Bibliography

* Pagel, J. L., ''Biog. Lex. s.v.'', Vienna, 1901; * ''Oesterreichische Wochenschrift'', 1904, pp. 533, 534

References

External links

*''Jewish Encyclopedia''
"Weigert, Karl"
by Isidore Singer & Frederick Haneman (1906). {{DEFAULTSORT:Weigert, Karl 1845 births 1904 deaths 19th-century German physicians German pathologists Silesian Jews People from Ziębice People from the Province of Silesia Burials at the Old Jewish Cemetery, Frankfurt