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OCR for page 273
CARL FREDERIC SCHMIDT
July 29, 1893-April 4, 1988
BY GEORGE B. KOELLE
CARE FREDERIC SCHMIDT was born on duly 29, IS93, in Leba-
non, Pa. Less than fifty years earlier, Ruclolf Bucheim
(~820-79) set up in Dorpat, Estonia, the worId's first labora-
tory devoted to the study of the actions of cirugs. Bucheim's
successor, Oswald Schmiedeberg ( ~ 838-1921 ), subsequently
moved to Strassburg where he eventually became univer-
sally regarded as the father of pharmacology; in all, he helped
to train approximately 120 students from twenty or so coun-
tries. Thus, the birth of Carl F. Schmidt and that of the
science of pharmacology were nearly synchronous.
Carl Schmidt's paternal grandfather, Jacob, came to the
Unitecl States from Germany in IS70 for the same reason as
mine: to avoid the Kaiser's draft. He settled in Philaclel-
phia, where his dual trades were violinist and repairer of
pipe organs. His son, Jacob Carl, was apprenticed to a jew-
eler in Reacting, Pa. The son was approximately six and half
feet tall, weighed 300 pounds, and was quite an athlete; he
pitched for a short time for the Baltimore Orioles, and for
several years thereafter was a "scorcher," or demon rider of
penny-farthing bicycles. After establishing his own jewelry
store in Reading, where Jacob met his wife, Ella Greth of
Scotch-Trish ancestry, the family en c! business moved to Leba-
non, Pa., where Carl was born.
273
OCR for page 274
274
BIOGRAPHICAL MEMOIRS
Carl enjoyed the standard boyhood offered by a small
town at the turn of the century. He and his elder brother,
Edward, were active in the usual sports, particularly base-
ball, football, bicycling, fishing, and hiking. He recalled
that at one time they constructed a crystal set radio re-
ceiver, but they never learned whether it functioned be-
cause there was no broadcasting station in the vicinity.
Throughout high school Car} received good grades and
finished first in his class. He was then faced with the deci-
sion of what career to choose. He decided against taking
un his father's trade as a jeweler as well as that of an auto-
~ · 1 1 · . ~ · ~ ~ ~ ~ ~ ~ ~ ~
mobile mechanic at which he had dabbled for several years.
Two more plausible choices remained: he was offered a
two-year scholarship at Lebanon Valley College, on the ba-
sis of his high school grades, and an appointment to West
Point. He opted for the latter, but failed the physical ex-
amination (because of his limited chest expansion); there-
fore, he accepted the college scholarship. This was subse-
quently renewed. Halfway through college he met Elizabeth
(Betsy) Viola Gruber, the middle member of a family of
seven sisters plus one brother. They went steady for six years.
then became engaged, and eventually, when Carl completed
his internship, were married. They enjoyed an ideal mar-
riage for sixty-two years until the death of Mrs. Schmidt.
remember her as a lovely person.
Just before Carl's graduation from college, the Schmidt
family physician was elected state senator, which permitted
him to offer Car! a scholarship to any school at the Univer-
sity of Pennsylvania. He accepted with alacrity and chose
the medical school because of its outstanding reputation.
He remained there most of the time from then on as a
student, intern, faculty member, department chairman, and
professor emeritus until his death at the age of ninety-four.
During his precTinical two years at Penn, Schmidt was
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CARL FREDERIC SCHMIDT
275
particularly impressed by the courses of Allen J. Smith in
pathology and Alfred Newton Richards in pharmacology.
The latter was the youngest chairman, having arrived at
Penn jut half a dozen years earlier in 1910.
Carl graduated in HIS, at the top of his class. He re-
ceived a commission in the Army Medical Corps and en-
tered a rotating internship at the Hospital of the University
of Pennsylvania (HUP). There, his first assignment was to
complete the blood counts of members of a crew of British
and Indian seamen from a ship that had put out from Bombay
a month earlier, had been refused landing at Liverpool be-
cause of an undiagnosed illness aboard, and had gone on
to Philadelphia. They were found to be suffering from a
vague but deadly type of respiratory infection and were
wisely held in a quarantined ward at HUP. These patients
proved to be the first seen in the United States in the three-
wave great influenza pandemic. Before it had run its course
it was responsible for several million deaths. In Philadel-
phia, it was the greatest medical crisis since the yellow fever
epidemic of 1793. The disease was found eventually to be
caused by a virus (at the time, these were only theoretical
entities) with a secondary streptococcal pulmonary infec-
tion; no treatment other than palliative was available. The
course of the pandemic extended well beyond the armi-
stice of World War ~ on November Il. 1918. Consequently,
Carl Schmidt's internship was a grim, exhaustive experi-
ence. When it ended, in August 19:~9, Carl considered a
number of possibilities and settled for the offer of an in-
structorship in pharmacology from Alfred Newton Richards.
He never regretted the decision.
With Carl's addition to the department, the faculty now
numbered three, the other member being Oscar Plant who
was an active participant in Richards's early memorable studies
of glomerular filtration. In addition to his teaching duties,
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276
BIOGRAPHICAL MEMOIRS
which he entered with enthusiasm, Schmidt initiated his
own research program in collaboration with W. Benson
Harrer (1923), which focused on the interrelationships be-
tween carbon clioxide, and morphine, heroin, and several
other drugs, in their moctif~cation of respiration of the clog.
For a short time Carl participated with Richards in the latter's
renal program ancI succeeded in cleveloping a method! for
visualizing the circulation of the kidney by means of a cov-
erslip and overheat! illumination (1924,11. However, these
microscopic studies prover! harmful to his eyes and he aban-
clonect them. While casting about to decicle on his next
research program, an opportunity presented itself that, af-
ter some deliberation, he and Mrs. Schmidt seizer! upon
with enthusiasm. Through Richards, he was invited to spend
two years teaching at the Peking Union Meclical College
with the support of the Rockefeller Foundation
_ . ,
Early in the summer of 1922 the Schmidts set out to
China by way of Vancouver, the Great Circle route near the
Aleutian Islands, Yokohama, Tokyo, Kobe, Nagasaki, and
Shanghai, anc! from there by an exhausting train trip to
Peking, or as it is now called, Beijing. They were surpriser!
ant! delighted by the spectacle of the medical college itself
~ ~ . ~ ~ . ~ ~
anct ot the comfortable cottage on the grounds which they
were to occupy for the next two years. During that time the
two outstanding events that occurred! in their lives were the
birth of Car! F. Schmidt, Jr., on June 16, 1923, and the
discovery or rediscovery along with K. K. Chen, of the sym-
pathomimetic alkaloid! ephedrine (cliscussed below). It is
notable that a remarkable number of outstanding Ameri-
can meclical educators and investigators spent varying peri-
ocis at Peking Union Meclical College during those years.
in spite of the many changes in government, the medical
school still functions as such; my wife Win and ~ visited
Schmidt's oils laboratory there ten years ago en cl were de-
~ . ~ ~
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CARL FREDERIC SCHMIDT
277
lighted to see the medical students still conducting phar-
macological exercises. While a number of battles were oc-
curring during the early twenties among the major war-
lords, particularly in Manchuria to the north, fortunately
for the Schmidts Peking did not become involved until af-
ter they left.
Following the Schmidts' return to Philadelphia in 1924,
Carl resumed his former post at Penn as assistant professor
of pharmacology, then associate professor ~ 1929), profes-
sor ~ 1931 ), chairman (1939), and professor emeritus ~ 1959-
881. In 1927 their daughter Barbara Elizabeth (deLong)
was born. Just before and after his retirement from the
University of Pennsylvania, Carl served as the editor of Cir-
culation Research ~ ~ 958-62), and was then appointed research
director of the Naval Air Developmental Center at Johnsville,
Pa. (1962-69), from which he finally retired at age seventy-
five. He and Mrs. Schmidt moved temporarily to Florida,
where he served as clinical professor of pharmacology at
the University of South Florida College of Medicine in Tampa
(1970-821. His research, additional activities, and honors
are related in the sections that follow.
RESEARCH
Fortunately for the writer, Schmidt separated his publica-
tions into appropriate categories; here, the sequence and
titles are modified slightly to allow a more chronological
presentation.
CHINESE DRUGS
When Carl Schmidt embarked on his Chinese adventure,
it had been suggested that he investigate the drugs in the
Chinese pharmacopoeia to find any that might be of par-
ticular value. There were approximately 4,000. As a basis
for starting this awesome project, he and his young Chinese
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278
BIOGRAPHICAL MEMOIRS
colleague, K. K. Chen, selected the drugs, mostly of botani-
cal origin, that were prescribed most frequently. (This was
long before the advent of the computer, which would have
simplified the task somewhat.) The results obtained with
the first half-dozen drugs that were tested were discourag-
ing. Then Chen discussed the project with his uncle, a Chi-
nese pharmacist. The latter suggested that they investigate
ma huang, a plant that had been tasted by the Emperor
Shen Nung more than 5,000 years earlier and placed in the
"medium class." Chen prepared an aqueous extract of the
crude drug which was injected into a dog at the conclusion
of a student practice experiment. To their amazement it
produced a prolonged rise in blood pressure (all other bo-
tanical extracts produced only hypotension or nothing. ~
Within a few days Chen isolated the active principle; a search
of the literature revealed that it had been found nearly fifty
years earlier by the Japanese investigator N. Nagai and named
ephedrine. However, only a few short notes had been pub-
lished on its actions. Chen and Schmidt conducted a thor-
ough investigation of ephedrine, which showed it to be an
orally active, long-acting sympathomimetic amine of a struc-
ture somewhat similar to that of epinephrine (1924,21. As a
result, ephedrine and similar synthetic compounds were in-
troduced into Western medicine and became widely em-
ployed for their cardiovascular, bronchodilator, and other
actions (19301.
RESPIRATORY AND CIRCULATORY REFLEXES
After his return from China, along with excursions into
other areas, Schmidt's major investigative work was divided
between studies of respiratory and circulatory reflexes and
the cerebral circulation.
In IS67 von Bezold and Hirt2 reported that the injection
of veratrine in rabbits caused bradycardia, hypotension, and
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CARL FREDERIC SCHMIDT
279
apnea. This observation was practically overIookecl until it
was recliscoverecl by Jarisch in 1940,3 when it was namecl
the Bezold-larisch reflex. Further investigation of this phe-
nomenon by Corneille F. Heymans of Ghent and his col-
laborators4 lecT to the discovery of both chemoreceptors
and pressoreceptors in the region of the internal carotid
artery that procluce(1 marked reflexes in the respiratory and
circulatory systems.
Car! Schmidt ant! his colleagues became involved in the
same field. The latter group inclu(lecl principally Julius H.
Comroe, fir., ant! Domingo M. Aviado, fir., as well as Aurilio
CerIetti, Robert D. Dripps, Jr., Paul R. Dumke, Marilyn E.
Hess, Orville Horwitz, Werner Kalow, T. H. Li, and others.
The laboratories of Heymans en cl Schmidt became the pre-
eminent ones in the world for their work in unraveling
these complicated systems.
To summarize this research, it was shown that nicotine
and other drugs also elicit the same reflexes. They were
found to arise from one or both types of receptor not only
in the carotid area but from the aortic body (the equivalent
of the chemoreceptors of the carotid bocly) and aortic arch
(which resembles the pressoreceptors of the carotid sinus),
as well as from the upper respiratory tract, pulmonary venous
area, coronary artery, and cardiac muscle and surface. Aluch
of the early work was reviewe(1 by Schmidt (] 945,]) and by
Aviaclo en c] Schmidt (19551; it has recently been updated
by Aviaclo.5 These studies represented not only a major con-
tribution to basic physiology, but were of great importance
in the work of Schmidt and his colleagues (1943,1) in avia-
tion medicine during Florid War IT and in Schmidt and
Lambertsen's ~965) later involvement in the physiological
aspects of space travel as cliscussed below.
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280
CEREBRAL BLOOD FLOW
BIOGRAPHICAL MEMOIRS
Carl Schmidt's interest in the control of respiration di-
rected him to studies of the influence of cerebral blood
flow on respiration (1923, 1928), in which measurement of
the perfusion function was initially based on venous out-
flow, giving way eventually to the use of a cooled or heated
thermocouple (19341. In 1943, with Paul Dumke, he made
the first quantitative and reliable measurements of cerebral
blood flow in the macaque monkey by intercalating into
the arterial input a bubble flow meter (1943,21. Two years
later he extended his measurements to cerebral oxygen con-
sumption under a variety of experimental conditions ~1945,2).
While participating in those studies, Seymour Kety, who had
joined the laboratory in 1943, devised a technique for mea-
suring the blood flow through the human brain, utilizing
the exchange of an inert gas between the perfusing blood
and the brain. With Carl Schmidt he tested the technique
in the monkey and calibrated it against the bubble flow
meter (1945,31. The Kety-Schmidt technique was applied in
1948 to normal volunteers for the first measurements of
blood flow and energy metabolism in the human brain
(194S,7) and then to a number of physiological and patho-
logical states ~ ~ 94S,2-5) .
RENAL CIRCULATION
In addition to his early work with A. N. Richards, cited
above, Car} Schmidt subsequently investigated the renal cir-
culation in collaboration with I. M. Hayman, {r. ~ ~ 929),
Arthur M. Walker (1937), and John H. Moyer, HadIey Conn,
and others (19501.
MISCELLANEOUS
In collaboration with Alfred E. Livingston, Schmidt pub-
lished a number of studies on the actions of morphine and
OCR for page 281
CARL FREDERIC SCHMIDT
28
related drugs (1933). He and Harry D. Bruner (1947) stud-
ied the bloodflow in the bronchial artery. With Christian I.
Lambertsen, P. L. Bunce, and David L. Drabkin (1952) he
measured the relationship between oxygen tension and he-
moglobin oxygen saturation.
Although I was Schmidt's first graduate student, I never
had the privilege of working in his laboratory. He graciously
allowed me to submit some work I had completed during
World War IT in collaboration with Alfred Gilman at the
Medical Research Laboratory, Edgewood Arsenal, as a the-
S1S.
AVIATION AND SPACE MEDICINE
With the advent of World War II, Schmidt became deeply
involved in aviation medicine. Here his aim was the devel-
opment of means for improving the performance of pilots
under extremes of gravitational and anoxic stresses (1943).
He returned to the same area many years later at another
level, after he became research director of the Naval Air
Development Center, which contained the world's largest
human centrifuge. He worked closely with John Glenn, Scott
Carpenter, Wally Schirra, L. Gordon Cooper, Virgil Grissom,
Frank Borman, Neil Armstrong, and the other pioneer as-
tronauts in showing them how to deal with the tremendous
G-forces they would encounter (1965).
HONORS AND MEMBERSHIPS
The list of Schmidt's societies and offices, editorships,
committees, lectureships, and honors is a long one. Phar-
macology on the international scene began as the Section
on Pharmacology (SEPHAR) of the International Union of
Physiological Sciences (IUPS), which in turn belonged to
the International Council of Scientific Unions (ICSU). (At
the annual meetings of the American Pharmacological So-
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282
BIOGRAPHICAL MEMOIRS
ciety, Schmidt used to delight us all with accounts of the
activities of these acronymical associations.) Among all the
pharmacologists of the florid, Schmidt was electec! the first
president of SEPHAR, in 1959. When pharmacology achieved
independent status in ~ 965 as TUPHAR the reader can
work out that one Schmidt, by then retired, was elected
its honorary president.
Schmidt belonged to the American Society for Pharma-
cology and Experimental Therapeutics (vice-presiclent, 1940-
42; president, 1948-501. He was also a member of the Na-
tional Academy of Sciences (elected! 1949~; the American
Academy of Arts and Sciences; American Heart Association;
American Physiological Society; Society for Experimental
Biology and Medicine; Association of American Physicians;
American Association for the Advancement of Science (fel-
Tow); Physiological Society of Philaclelphia; College of Phy-
sicians of Philadelphia (fellow); Penn Valley Association (presi-
clent, 1944-461; Meclical Association of the Argentine; Merion
Cricket Club; ant! others. Schmidt was managing editor of
the Journal of Pharmacology and Experimental Therapeutics ~~ 940-
42) anc! Circulation Research (1958-62) and associate editor
of Chemical Abstracts (1942-481. The list of his memberships
on important international ant! national committees is ex-
tensive.
Among Carl Schmicit's many honors were honorary cle-
grees from his alma maters, Lebanon Valley College ant!
the University of Pennsylvania, and from Charles University
in Prague. In 1984 he received the Distinguishes! Graduate
Awarc! of the School of Medicine of the University of Penn-
sylvania. In 1962 he was the sixth recipient over many years
of the Schmiecleberg Plakette of the German Pharmaco-
Togical Society. The citation that accompanied the award
captured the man: "for magnificent contributions to ser-
OCR for page 283
CARL FREDERIC SCHMIDT
283
vice for pharmacology and in recognition of his spirit of
magnanimity and great humanity."
GENERAL
The designation "clinical pharmacology" refers to a rela-
tively young branch of the science that concerns the inves-
tigation of new drugs in human subjects after their efficacy
and safety have been established by animal studies. Although
T never heard either of them use the term, Schmidt and his
predecessor Richards ~1971~ were among the pioneers in
this field. Most of their junior associates were residents in
internal medicine, anesthesiology, and other medical spe-
cialties who spent one or more years in the Department of
Pharmacology learning the principles of pharmacological
research. They then returned to their clinical departments
to put these principles into practice.
In addition to their extended stay in China early in Carl
Schmidt's career, the Schmidts did considerable traveling
. . . . . . . . .
for his participation In International meetings, lecturing,
and service with the Unitarian Medical Mission to Germany
in 1948. Their most extensive journeys were taken shortly
before his retirement from Penn; between July 1955 and
February 1956, they took four trips covering some 50,000
miles. On those occasions their destinations included the
Philippines, Japan, Taiwan, Hong Kong, Australia, New
Zealand, Indonesia, Singapore, Thailand, Vietnam, Burma,
India, Pakistan, Sudan,
_
Rhodesia, Uganda, Kenya, Lebanon,
Syria, Israel, Jordan, Egypt, Madagascar, Turkey, Italy, Spain,
France, Greece, and Monaco.
In spite of his numerous other activities related above,
Schmidt always considered his primary responsibility to be
teaching. His lectures were models of clarity, precision, and
enthusiasm, and inspired his younger colleagues to follow
OCR for page 284
284
BIOGRAPHICAL MEMOIRS
suit. As a result, pharmacology was generally acknowlecigecI
by the students to be the best course in the meclical school.
In 1976 his old department established the Car! F. Schmidt
Honorary Lectureship. Schmidt gave the first annual lec-
ture of the series. Subsequent lectures, which are followed
by dinner en cl an evening of goof! fellowship, were pre-
sented by his former associates and by distinguishes! phar-
macologists from throughout the world. He and Mrs. Schmidt
attended all up to the time of their cleaths. The Schmidt
lectures will continue in perpetuity.
After the death of Mrs. Schmidt in 1982, Carl Schmidt
liver} with his son, Carl, Jr., and his wife Betty. Shortly after
Schmicit's death, at the age of ninety-four, the tragic prema-
ture death of his son followed. Betty ministered to them
both, with deep affection and devotee! care to the end. In
adclition to his daughter, Barbara Elizabeth deLong, Schmidt
left five grancichiTciren and two great-grancichildren.
AM ESPECIALLY G~TEFUL to Mrs. Carl F. (Betty) Schmidt, Jr., for her
time and expertise in assembling the considerable volume of her
father-in-law's unpublished writings and correspondence, upon which
most of this memoir is based. Portions of this memoir are repro-
duced from a shorter one published by the author in the Transac-
tions of the College of Physicians of Philadelphia (ser. 5, vol. 11, no. 3,
pp. 261-65, 1989), for which permission has been granted. Mrs. Ava
M. Evans typed the manuscript.
NOTES
1. I. Z. Bowers. The founding of Peking Union Medical College.
Policies and personalities. Bulletin of the History of Medicine 45 ~ 1971 ~ :305-
21, 409-29.
2. A. van Bezold and L. Hirt. Uber die physiologischen Wirkungen
des essigsauren Veratrin e. Unters. Physiol. Lab. Wurzburg 1 ~ 1 867 ): 73-
122.
3. A. Jarisch. Vom Herzen ausgehende Kreislaufreflexe. Arch. Kreasl.-
Forsch 7 ~ 1940) :260-74.
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CARL FREDERIC SCHMIDT
285
4. C. F. Heymans, and E. NeiL ~~r ~~ ~ r6~ C~-
c~r ~~. Boston: Lisle, Brown, 1 g58.
5. D. hi. Misdo. Nicotinic receptors in healthy and ischemic
heart ash special reference to the Bezoldjar~ch reflex. Add. ~r
A. 319~1992~:5-23.
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286
BIOGRAPHICAL MEMOIRS
SELECTED BIBLIOGRAPHY
1923
With W. B. Harrer. The action of drugs on respiration. I. The mor-
phine series. [. Exp. Med. 37:47-67.
1924
With A. N. Richards. A description of the glomerular circulation in
the frogs kidney and observations concerning the action of adrenalin
and various other substances upon it. Am. f. Physiol. 71:178-208.
With K. K. Chen. The action of ephedrine, the active principle of
the Chinese drug, Ma Huang. [. Pharmacol. Exp. Ther. 24:339-57.
1928
The influence of cerebral blood flow on respiration. I. The respira-
tory responses to changes in cerebral blood flow. Am. f. Physiol.
84:202-22.
1929
With J. M. Hayman, Jr. A note upon lymph formation in the dog's
kidney and the effect of certain diuretics upon it. Am. J. Physiol.
91:157-60.
1930
With K. K. Chen. Ephedrine and related substances. Medicine 9:2-
117.
1933
With A. E. Livingston. The relation of dosage to the development
of tolerance to morphine in dogs. [. Pharmacol. Exp. Ther. 47:443-
71.
1934
With I. C. Pierson. The intrinsic regulation of the blood vessels of
the medulla oblongata. Am. J. Physiol. 108:241-63.
1937
With A. M. Walker, K. A. Elsom, and C. G. Johnson. Renal blood
OCR for page 287
CARL FREDERIC SCHMIDT
287
flow of unanesthetized rabbits and dogs in diuresis and antidiuresis.
Am. I. Physiol. 118:95-110.
1943
Some physiological problems of aviation. Tr. Stud. Coll. Phys. Phila.
11 :57-64.
With P. R. Dumke. Quantitative measurements of cerebral blood
flow in the macaque monkey. Am. J. Physiol. 138:421-31.
1945
Respiration. Ann. Rev. Physiol. 7:231-74.
With S. S. Kety and H. H. Pennes. The gaseous metabolism of the
brain of the monkey. Am. I. Physiol. 143:33-52.
With S. S. Kety. The determination of cerebral blood flow in man
by the use of nitrous oxide in low concentrations. Am. J. Physiol.
143:53-66.
1947
With H. D. Bruner. Blood flow in the bronchial artery of the anes-
thetized dog. Am. J. Physiol. 148:648-66.
1948
With S. S. Kety. The nitrous oxide method for the quantitative de-
termination of cerebral blood flow in man: Theory, procedure
and normal values. {. Clin. Invest. 27:476-83.
With S. S. Kety, R. B. Woodford, M. H. Harmel, F. A. Frehan, and
K. E. Appel. Cerebral blood flow and metabolism in schizophre-
nia. The effects of barbiturate semi-narcosis, insulin coma and
electroshock. Am. i. Psychiat. 104:765-70.
With S. S. Kety. The effects of altered arterial tensions of carbon
dioxide and oxygen on cerebral blood flow and cerebral oxygen
consumption of normal young men. [. Clin. Invest. 27:484-92.
With S. S. Kety and H. A. Shenkin. The effects of increased intra-
cranial pressure on cerebral circulatory functions in man. J. Clin.
Invest. 27:493-99.
With S. S. Kety, B. D. Polis and C. S. Nadler. The blood flow and
oxygen consumption of the human brain in diabetic acidosis and
coma. [. Clin. Invest. 27:500-510.
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288
BIOGRAPHICAL MEMOIRS
1950
With I. H. Moyer, H. Conn, and K. Markley. Attempt to demon-
strate vascular by-passes in the kidney (the Trueta phenomenon).
Am. f. Physiol. 161:250-58.
1952
With C. I. Lambertsen, P. L. Bunce, and D. L. Drabkin. Relation-
ship of oxygen tension to hemoglobin oxygen saturation in the
arterial blood of normal men. {. Appl. Physiol. 4:873-85.
1955
With D. M. Aviado, Jr. Reflexes from stretch receptors in blood
vessels, heart and lungs. Physiol. Rev. 35:247-300.
1965
With C. J. Lambertsen. Pharmacology in space medicin
Pharmacol. 5:383-404.
1971
.e. Ann. Rev.
Alfred Newton Richards. In Biographical Memoirs, vol. 42, pp. 271-
318. Washington, D.C.: National Academy Press.
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Representative terms from entire chapter:
cerebral blood
