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Dr. Soma Weiss (1899-1942) described this case in his article, "Carotid sinus reflex in health and disease," published in Medicine, v. 12 (1933).
]]>This collar was worn by a Boston streetcar motorman who was subject to attacks of dizziness and loss of consciousness on the job. Upon examination at Massachusetts General Hospital, it was determined that when the motorman turned his head, his stiff shirt collar pressed against the right carotid sinus, triggering a fainting attack. "Pulse and blood pressure measurements were made with the patient turning his head from side to side while wearing one of his celluloid collars. These movements caused pressure on the carotid sinuses, and resulted in slight slowing of the heart rate, fall in blood pressure as much as 40mm. Hg systolic, sometimes dizziness, but not fainting. The patient was advised to wear a soft collar, which he has done for the past month. In that time has had no more attacks of dizziness or fainting."
Dr. Soma Weiss (1899-1942) described this case in his article, "Carotid sinus reflex in health and disease," published in Medicine, v. 12 (1933).
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Accessing collections in the Warren Anatomical Museum and the Warren Anatomical Museum archive requires advanced notice. Please submit a request to Public Services to access the displayed item.
View the online catalog record.
View the online catalog record.
Accessing collections in the Warren Anatomical Museum and the Warren Anatomical Museum archive requires advanced notice. Please submit a request to Public Services to access the displayed item.
View the online catalog record.
View the online catalog record.
View the online catalog record.
Beginning in October 1948, weekly meetings of the Formed Elements Group of Cohn's laboratory staff and associates were held to discuss research and developments in plasma fractionation and blood preservation and storage. These meetings resulted in the establishment of the Blood Characterization and Preservation Laboratory in January, 1951.
While the first bowls for the Cohn centrifuge were made of glass, the examples here show later refinements, the one made of stainless steel, the other a single use, disposable bowl, developed by Allen D. Latham, Jr.
]]>After World War II, Harvard researcher Edwin Joseph Cohn (1892-1953) devised a small centrifuge in which a donor's blood could be quickly separated into its components and stored more efficiently. The centrifugal force employed divides the heavier red blood cells from the lighter plasma.
Beginning in October 1948, weekly meetings of the Formed Elements Group of Cohn's laboratory staff and associates were held to discuss research and developments in plasma fractionation and blood preservation and storage. These meetings resulted in the establishment of the Blood Characterization and Preservation Laboratory in January, 1951.
While the first bowls for the Cohn centrifuge were made of glass, the examples here show later refinements, the one made of stainless steel, the other a single use, disposable bowl, developed by Allen D. Latham, Jr.
Latham Bowl, Plastic, Single-Use, 1972-2007. Two clear and white plastic components. The largest is a bulbous plastic bell-shaped body. The body appears to have two main pieces: an exterior clear plastic shell and a white plastic interior bulb. The second piece of the unit is a clear plastic drum with a long metal cylinder threaded through its center.
Cohn Centrifuge, stainless steel, 1952-1972. Two metal components. The majority of the piece is composed of a bulbous metal body that tampers to a circular flat end. The widest point of the body has a thick metal band around its diameter. The body's hallow interior has several distinct chambers. The second piece of the cell separator inserts into the larger body. It is composed of a circular metal drum from which extends a thin cylinder with a plastic tip. When inserted into the body only the base of the drum is visible.
During her tenure as an HMS professor and researcher, Elizabeth Dexter Hay (1927-2007) achieved many notable
Plaster model of embryo aged 6-7 weeks, Carnegie Stage 17. Unpainted plaster model of embryo head, sectioned at mid-body to expose tail interior.
Plaster model of embryo aged 7-8 weeks, Carnegie Stage 20. Unpainted plaster model of embryo head, sectioned at mouth aperture.
Both models are plaster set on wire mesh, and are part of a set of teaching models.
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