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Land Margin Ecosystems Research (LMER) Annual Scientists' Meeting 1992 Report

Contents: "Land Margin Ecosystems Research"; "Annual Scientists' Meeting: Purpose and summary"; "List of meeting participants"; "Report of the workshop on vertical coupling"; "Report of the workshop on coupling between land and water"; "Report of the workshop on use of geographic information systems"; "Report of the workshop on biological-physical modeling"

Created: 1992-11

Example of a simplified nutrient cycle from Ecosystems Center 1979 annual report

Caption reads: "Figure 1. The biotic systems that have built and now maintain the biosphere also influence the cycles of carbon, nitrogen, sulfer, and other elements. The general pattern of movement is a series of exchanges between the atmosphere, the land, and the sea. Human activities worldwide have mobilized significant additional quantities of biotically important substances, including toxins, and have modified the natural cycles."

Created: 1979

The Ecosystems Center Report 2012

Annual Report of the Ecosystems Center at the Marine Biological Laboratory covering the year 2012

Created: 2012

The Ecosystems Center Report 2010

Annual Report of the Ecosystems Center at the Marine Biological Laboratory covering the year 2010

Created: 2010

The Ecosystems Center Report 2009

Annual Report of the Ecosystems Center at the Marine Biological Laboratory covering the year 2009

Created: 2009

The Ecosystems Center Report 2008

Annual Report of the Ecosystems Center at the Marine Biological Laboratory covering the year 2008

Created: 2008

The Ecosystems Center Report 2006

Annual Report of the Ecosystems Center at the Marine Biological Laboratory covering the year 2006

Created: 2006

The Ecosystems Center Report 2007

Annual Report of the Ecosystems Center at the Marine Biological Laboratory covering the year 2007

Created: 2007

The Ecosystems Center Report 2005

Annual Report of the Ecosystems Center at the Marine Biological Laboratory covering the year 2005

Created: 2005

Simulation of global annual net primary production from Ecosystems Center researchers' Terrestrial Ecosystem Model

Caption reads: "Figure 2. Annual net primary production (NPP) for undisturbed mature vegetation of the earth's ecosystems as determined by the Terrestrial Ecosystem Model (TEM) for current climate at atmosphereic carbon dioxide levels."

Created: 1992

Understanding changes in coastal ecosystems: the Land Margin Ecosystems Research Program, draft report

Title: "Understanding changes in coastal ecosystems: the Land Margin Ecosystems Research Program"

Ernest Everett Just (1883-1941)

Ernest Everett Just

Ernest Everett Just was an early twentieth century American experimental embryologist involved in research at the Marine Biological Laboratory (MBL) at Woods Hole, Massachusetts, and the Stazione Zoologica in Naples, Italy. Just was known for simple but elegant experiments that supported the “fertilizing” theory of Frank R. Lillie and served as an antagonist to Jacques Loeb’s work with artificial parthenogenesis. Just’s many experiments with marine invertebrates showed that the egg surface, or ectoplasm, plays an important role in the fertilization and development of eggs.

Just was born in Charleston, South Carolina, on 14 August 1883 to Charles Frazier Just Jr. and Mary Matthew Just. His father died in 1887 and soon after the Just family moved to James Island, off the coast of South Carolina. His early education consisted of attending the small school that his mother founded and directed. Just left James Island at the age of twelve to attend the Colored Normal Industrial Agricultural and Mechanics College at Orangeburg (now South Carolina State College). In 1899 Just graduated with a Licentiate of Instruction, meaning that he was certified to teach in any black school in South Carolina. He was only fifteen years old.

Teaching did not appeal to the teenager so he traveled north, picking up odd jobs along the way until he reached Kimball Union Academy in Meriden, New Hampshire. Just finished a classical course of study in three years, during which time his mother died. The young college graduate was advised by friends and teachers to attend Dartmouth College which he decided to do. At Dartmouth, Just studied biology, history, literature, and the classics. He graduated from Dartmouth in 1907, the only “magna cum laude” in his class, with an AB degree and joined the English faculty at Howard University, Washington, DC in the fall of that same year. He was asked to take over the biology department and teach physiology in 1910, in addition to his English teaching duties. Soon after, Just became the first head of the new Department of Zoology and gave up teaching English courses.

Through a Dartmouth contact, Just communicated with Lillie at the University of Chicago about a post-graduate degree in biology. Lillie directed Just to begin research in 1909 at Woods Hole and to take courses at the University of Chicago. Work at the marine station quickly turned into a research assistantship, working side-by-side with Lillie. All of this was done in addition to maintaining a full-time teaching position at Howard. After obtaining his PhD, Just returned annually to Woods Hole as an independent researcher.

Just focused his interests on marine invertebrate eggs, both in the laboratory and in their natural setting. Because of his tacit knowledge of how marine invertebrates reproduced in oceans and estuaries, Just was able to closely match his laboratory environment to that of the organism’s natural environment. In 1912, Just’s first paper, “The Relation of the First Cleavage Plane to the Entrance Point of the Sperm.” was published in the Biological Bulletin. Just showed that eggs of the marine worm (Nereis) cleave in different planes depending on the sperm’s point of entry. To Just, the egg’s surface was an important and robust factor in the fertilization process. By showing that sperm had an equal probability of entering the egg at any point on the egg’s surface, and that the direction of cleavage depended on the arbitrary point of entry of sperm, and not some predetermined cleavage plane, Just made a dent in preformationist theory. It was also during this time that he married Ethel Highwarden in 1912 and met Jacques Loeb while Loeb was at the Rockefeller Institute for Medical Research. Similar research interests and Loeb’s stand on social equality made the two embryologists fast, but not longstanding friends. In 1915 Just was the first to receive the Spingarn Medal, presented annually to the African-American who performs the greatest service to his or her race. This was followed by the University of Chicago awarding Just his PhD degree in experimental embryology in 1916.

During 1919 and 1920, Just published four papers in the Biological Bulletin, all focusing on his work with the sand dollar Echinarachnius parma. In one set of experiments Just measured the elevation of the egg membrane at sperm contact and the time that it took for the membrane to be penetrated by a sperm. He observed that the sperm was pulled into the egg rather than the commonly held view that it actively bored its way into the egg. Just also documented a “wave of instability” that moved from the sperm’s entry point to the opposite side of the egg. Since then, embryologists have proven that such an instability wave is a wave of cortical granule exocytosis that forms the fertilization envelope. Just also saw that the wave was associated with an immediate blocking of any further sperm penetrability of the egg.

In 1920, while continuing to teach at Howard, Just obtained a ten-year research fellowship from Julius Rosenwald through the National Research Council. He wasted no time in returning to his work at Woods Hole where he continued to study the process of fertilization with results that strengthened Lillie’s work and questioned Loeb’s idea of “superficial cytolysis.” According to Loeb’s studies, egg development could be initiated by exposing eggs to butyric acid. Development was then immediately followed by the release of lysine, Loeb’s cytolytic agent, to break down the egg cortex. Just showed that putting eggs in butyric acid for a short period of time actually slowed cytolysis rather than sped it up. Just was able to prove that the cytolytic effect of the butyric acid was due to overexposure of the eggs to the acid and nothing more. He went even further in dismissing Loeb’s experimental findings on artificial parthenogenesis, attacking Loeb’s method of record-keeping and his apparent failure to maintain experimental conditions to mimic his experimental organisms’ natural environments.

The friendship that Just and Loeb had forged together at Woods Hole quickly vanished. Their disagreements played out for many years, with Loeb providing negative evaluations of Just to the Rockefeller Institute and the Carnegie Foundation. Every time Just tried to obtain grant money, Loeb’s evaluations seemed to rise up and quell any grant award.

In 1929 Just made his first trip to Europe and worked at Anton Dohrn’s Stazione Zoologica in Naples. For six months he experimented with sea urchins (Paracentrotus lividus and Echinus microtuberculatus) to see how these organisms develop and to continue testing Lillie’s “fertilizin” theory of fertilization. Around 1906 Lillie had hypothesized that eggs release a substance that he coined fertilizin. Upon contact with spermatozoa, said Lillie, fertilizin causes sperm to attach to it. Lillie believed that fertilizin molecules served as receptors on the egg’s surface. With receptors for egg and sperm surfaces, the molecule helped to “agglutinate” egg and sperm together.

In 1930 Just was invited to the Kaiser Wilhelm Institute in Berlin where he continued his studies of the ectoplasm with other species, including Amoeba. Just strove to show the importance of ectoplasm in initiation of development. While in Europe he published three articles on the role of ectoplasm: “ Die Rolle des kortikalen Cytoplasmas bei vitalen Erscheinungen” (“The Role of Cortical Cytoplasmin Vital Phenomena”) in Naturwissenschaften (1931) and “On Origin of Mutations” (1932) and “Cortical Cytoplasm and Evolution” (1933), both published in the American Naturalist. All three articles pointed to Just’s view that ectoplasm is necessary for fertilization to occur.

With little hope of ever being able to teach anywhere but a black college, and his continued failure to secure research funds, Just went to Europe in 1938 with the intent of leaving Howard and finishing out his research career on a new continent. In 1939 he published two books: Basic Methods for Experiments on Eggs of Marine Animals and The Biology of the Cell Surface. Both books reflected Just’s holistic view of eggs and embryos: that is, eggs are to be taken seriously in their own right rather than seen simply as tools to manipulate in order to prove a theory. While Just’s experiments may have been simple, he was an intense perfectionist when it came to laboratory procedure. His ability to keep laboratory environments similar to actual marine environments aided in the integrity of his research. It also led to his life-long criticism of experimental embryologists who failed to appreciate his tacit knowledge about inducing marine invertebrate reproduction. To Just, too many embryologists were busy taking eggs out of natural environments and subjecting them to unnatural manipulations while ignoring the importance of the eggs’ environment as an important factor in development. In The Biology of the Cell Surface, Just also continued his attack on the role of genes in development. He remained adamant that cytoplasm was the key to development and not the nucleus. This countered the growing enthusiasm by geneticists who held the idea that the nucleus controlled fertilization and development.

The Nazi invasion of France in 1940 forced Just to return to the US and Howard University, one of the few institutions at the time that would hire a black scientist. His attempt to recareer again in the United States was short-lived however. Just died of pancreatic cancer on 27 October 1941.

Sources

  1. Byrnes, Malcolm W. “Ernest Everett Just.” New Dictionary of Scientific Biography 4: 66– 70.
  2. Byrnes, Malcolm W., and William R. Eckberg. “Ernest Everett Just (1883-1941): An Early Ecological Developmental Biologist,” Developmental Biology 296 (2006): 1– 11.
  3. Gilbert, Scott F. “Cellular Politics: Ernest Everett Just, Richard B. Goldschmidt, and the Attempt to Reconcile Embryology and Genetics.” In The American Development of Biology, eds. Ronald Rainger, Keith R. Benson, and Jane Maienschein, 311–42. Philadelphia, PA: University of Pennsylvania Press, 1988.
  4. Gould, Stephen Jay. “Just in the Middle: A Solution to the Mechanist-Vitalist Controversy.” In The Flamingo’s Smile: Reflections in Natural History, 337-391. New York: W. W. Norton, 1985.
  5. Just, Ernest E., “The Relation of the First Cleavage Plane at the Entrance Point of the Sperm,” Biological Bulletin 22 (1912): 239–52.
  6. Lillie, Frank R. “Obituary of Ernest Everett,” Science 95 (1942): 10–11.
  7. Manning, Kenneth J. Black Apollo of Science: The Life of Ernest Everett Just. New York: Oxford University Press, 1983.
  8. Pauly, Philip J. Controlling Life: Jacques Loeb and the Engineering Ideal in Biology. New York: Oxford University Press, 1987.

Ernest Everett Just was an early twentieth century American experimental embryologist involved in research at the Marine Biological Laboratory (MBL) at Woods Hole, Massachusetts, and the Stazione Zoologica in Naples, Italy. Just was known for simple but elegant experiments that supported the "fertilizing" theory of Frank R. Lillie and served as an antagonist to Jacques Loeb's work with artificial parthenogenesis.

Created: 2010-06-16

James David Ebert (1921-2001)

James David Ebert (1921-2001)

James David Ebert studied the developmental processes of chicks and of viruses in the US during the twentieth century. He also helped build and grow many research institutions, such as the Department of Embryology in the Carnegie Institution of Washington in Baltimore, Maryland and the Marine Biological Laboratory (MBL) in Woods Hole, Massachusetts. When few biologists studied the biochemistry of embryos, Ebert built programs and courses around the foci of biochemistry and genetics, especially with regards to embryology. He eventually directed the MBL's Embryology Course, and later, the MBL itself.

Ebert was born on 11 December 1921 in the town of Bentleyville, Pennsylvania. He attended public schools while growing up and then graduated from Washington and Jefferson College in Washington, Pennsylvania in 1942. Not long after graduation he joined the United States Navy and eventually became a lieutenant. Ebert was stationed on a destroyer in the Pacific Ocean that was attacked by a kamikaze pilot. The destroyer sank and Ebert spent twenty-four hours in the ocean until being rescued. Afterwards, as a biologist, Ebert befriended and trained several Japanese developmental biologists.

In 1946 Ebert began working towards his PhD in developmental biology under the instruction of Benjamin Willier at the Johns Hopkins University in Baltimore, Maryland. In the same year he married Alma Goodwin, who was a Women Accepted for Volunteer Emergency during the war. Ebert received his PhD in 1950 and immediately became a member of the faculty at the Massachusetts Institute of Technology (MIT) in Cambridge, Massachusetts. After one year at MIT, Ebert moved to Indiana University in Bloomington, Indiana. Ebert became an associate professor of zoology by 1955, and he had started a program of experimental embryology. He studied chick embryos and the processes by which the protein make-up of the embryos changed throughout development.

Six years after receiving his PhD, Ebert became the director of the Carnegie Institution of Washington's Department of Embryology, in Baltimore, Maryland. Prior to Ebert's term as director, the department had had three other directors. The Institution's president, Caryl Haskins, had contemplated closing the department and starting something new. However, with some persuasion from Willier, Haskins spoke with Ebert and decided to give him the opportunity to run the department. Ebert and Haskins agreed that the department needed to focus on the study of genes and their regulation as well as the ways cells influence one another. Haskins said that Ebert's youth and enthusiastic personality made Haskins believe that Ebert would provide a fresh perspective to the department.

Ebert argued that it was his job to recognize and to recruit new talent and then support them in their work. He stressed the use of biochemistry and genetics, which in the 1960s blended together to form molecular biology. During this time, Ebert started to study the relationship between muscle cell differentiation and the propensity to infection in the Rous sarcoma virus.

While still director of the Carnegie embryology department, in 1970 Ebert also became the president and nonresident director of the Marine Biological Laboratory (MBL) at Woods Hole. At the MBL he researched, with Keiko Ozato, the response of murine lymphocytes to mitogens.

In 1977 Ebert ended his term at the Carnegie Department of Embryology, but he remained the director of the MBL. From 1978 until 1987, Ebert lived in Washington, D.C., and he was the president of the whole Carnegie Institution of Washington. As the institution's president, he made the decision to help build a large optical telescope in Chile at Las Campanas Observatory, and he worked towards the creation of a common campus for both Carnegie departments in Washington.

Ebert remained involved with scientific institutions for the rest of his life. When leaving one institution, he found another one to join. He retired from the Carnegie Institution in 1987 and became the president of the Chesapeake Bay Institute at the Johns Hopkins University, where he was a professor of biology for six years. Ebert was elected to many societies including the National Academy of Sciences, the American Philosophical Society, the American Academy of Arts and Sciences, and the Institute of Medicine. He was the vice president of the National Academy of Sciences from 1981 through 1993 and he also chaired its Government-University-Industry Research Roundtable from 1987 through 1993. His colleagues elected him as president of the Society for the Study of Development and Growth, the American Institute of Biological Sciences, and the American Society of Zoologists.

In retirement, Ebert and his wife Alma spent half of each year in Woods Hole and at the MBL. Ebert and Alma died on 22 May 2001 in an automobile accident while en route to Woods Hole.

Sources

  1. DeHaan, Robert L., and James D. Ebert. "Morphogenesis." Annual Review of Physiology 26 (1964): 15–46.
  2. Ebert, James D. "An analysis of the effects of anti-organ sera on the development, in vitro, of the early chick blastoderm." Journal of Experimental Zoology 115 (1950): 351–77.
  3. Ebert, James D. "An analysis of the synthesis and distribution of the contractile protein, myosin, in the development of the heart." Proceedings of the National Academy of Sciences 39 (1953): 333–44.
  4. Ebert, James D. "The effects of chorioallantoic transplants of adult chicken tissues on homologous tissues of the host chick embryo." Proceedings of the National Academy of Sciences 40 (1954): 337–47.
  5. Ebert, James D. "The formation of muscle and muscle-like elements in the chorioallantoic membrane following inoculation of a mixture of cardiac microsomes and Rous sarcoma virus." Journal of Experimental Zoology 142 (1959): 587–621.
  6. Ebert, James D., and Ian M. Sussex. Interacting Systems in Development. New York: Holt, Rinehart and Winston, 1970.
  7. Ebert, James D., and Fred H. Wilt. "Animal Viruses and Embryos." The Quarterly Review of Biology 35 (1960): 261–312.
  8. Obituaries. "Jim and Alma Ebert." Marine Biological Laboratory. http://www.mbl.edu/news/obit/obit_ebert.html (Accessed December 8, 2007).
  9. Ozato, Keiko, William H. Adler, and James D. Ebert. "Synergism of bacterial lipopolysaccharides and concanavalin A in the activation of thymic lymphocytes." Cellular Immunology 17 (1975): 532–41.
  10. Singer, Maxine. "James David Ebert." Proceedings of the American Philosophical Society 148 (2004): 124–27.

James David Ebert studied the developmental processes of chicks and of viruses in the US during the twentieth century. He also helped build and grow many research institutions, such as the Department of Embryology in the Carnegie Institution of Washington in Baltimore, Maryland and the Marine Biological Laboratory (MBL) in Woods Hole, Massachusetts. When few biologists studied the biochemistry of embryos, Ebert built programs and courses around the foci of biochemistry and genetics, especially with regards to embryology.

Created: 2008-09-12