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Eric H. Davidson
Eric Harris Davidson (April 13, 1937 – September 1, 2015) was an American developmental biologist at the California Institute of Technology. Davidson was best known for his pioneering work on the role of gene regulation in evolution, on embryonic specification and for spearheading the effort to sequence the genome of the purple sea urchin, ''Strongylocentrotus purpuratus''. He devoted a large part of his professional career to developing an understanding of embryogenesis at the genetic level. He wrote many academic works describing his work, including a textbook on early animal development. Early career Davidson began conducting research as a teenager at The Marine Biological Laboratory. After graduating from high school, he matriculated to the University of Pennsylvania and graduated with a B.A. in biology in 1958. Davidson's Ph.D. work entailed studying RNA synthesis and gene expression in early development of the anuran ''Xenopus laevis'' in the lab of Alfred Mirsky at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New York City
New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the List of United States cities by population density, most densely populated major city in the United States, and is more than twice as populous as second-place Los Angeles. New York City lies at the southern tip of New York (state), New York State, and constitutes the geographical and demographic center of both the Northeast megalopolis and the New York metropolitan area, the largest metropolitan area in the world by urban area, urban landmass. With over 20.1 million people in its metropolitan statistical area and 23.5 million in its combined statistical area as of 2020, New York is one of the world's most populous Megacity, megacities, and over 58 million people live within of the city. New York City is a global city, global Culture of New ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Embryogenesis
An embryo is an initial stage of development of a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sperm cell. The resulting fusion of these two cells produces a single-celled zygote that undergoes many cell divisions that produce cells known as blastomeres. The blastomeres are arranged as a solid ball that when reaching a certain size, called a morula, takes in fluid to create a cavity called a blastocoel. The structure is then termed a blastula, or a blastocyst in mammals. The mammalian blastocyst hatches before implantating into the endometrial lining of the womb. Once implanted the embryo will continue its development through the next stages of gastrulation, neurulation, and organogenesis. Gastrulation is the formation of the three germ layers that will form all of the different parts of the body. Neurulation forms the nervous sys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Embryologists
American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, people who self-identify their ancestry as "American" ** American English, the set of varieties of the English language native to the United States ** Native Americans in the United States, indigenous peoples of the United States * American, something of, from, or related to the Americas, also known as "America" ** Indigenous peoples of the Americas * American (word), for analysis and history of the meanings in various contexts Organizations * American Airlines, U.S.-based airline headquartered in Fort Worth, Texas * American Athletic Conference, an American college athletic conference * American Recordings (record label), a record label previously known as Def American * American University, in Washington, D.C. Sports teams Soccer * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Developmental Biologists
Development of the human body is the process of growth to maturity. The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male. The resulting zygote develops through mitosis and cell differentiation, and the resulting embryo then implants in the uterus, where the embryo continues development through a fetal stage until birth. Further growth and development continues after birth, and includes both physical and psychological development, influenced by genetic, hormonal, environmental and other factors. This continues throughout life: through childhood and adolescence into adulthood. Before birth Development before birth, or prenatal development () is the process in which a zygote, and later an embryo and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote, the first stage in embryonic development which continues in fetal development until b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2015 Deaths
This is a list of deaths of notable people, organised by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked here. 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 See also * Lists of deaths by day The following pages, corresponding to the Gregorian calendar, list the historical events, births, deaths, and holidays and observances of the specified day of the year: Footnotes See also * Leap year * List of calendars * List of non-standard ... * Deaths by year {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1937 Births
Events January * January 1 – Anastasio Somoza García becomes President of Nicaragua. * January 5 – Water levels begin to rise in the Ohio River in the United States, leading to the Ohio River flood of 1937, which continues into February, leaving 1 million people homeless and 385 people dead. * January 15 – Spanish Civil War: Second Battle of the Corunna Road ends inconclusively. * January 20 – Second inauguration of Franklin D. Roosevelt: Franklin D. Roosevelt is sworn in for a second term as President of the United States. This is the first time that the United States presidential inauguration occurs on this date; the change is due to the ratification in 1933 of the Twentieth Amendment to the United States Constitution. * January 23 – Moscow Trials: Trial of the Anti-Soviet Trotskyist Center – In the Soviet Union 17 leading Communists go on trial, accused of participating in a plot led by Leon Trotsky to overthrow Joseph Stalin's regime, and assas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smithsonian Folkways
Smithsonian Folkways is the nonprofit record label of the Smithsonian Institution. It is a part of the Smithsonian's Smithsonian Center for Folklife and Cultural Heritage, located at Capital Gallery in downtown Washington, D.C. The label was founded in 1987 after the family of Moses Asch, founder of Folkways Records, donated the entire Folkways Records label to the Smithsonian. The donation was made on the condition that the Institution continue Asch's policy that each of the more than 2,000 albums of Folkways Records remain in print forever, regardless of sales. Since then, the label has expanded on Asch's vision of documenting the sounds of the world, adding six other record labels to the collection, as well as releasing over 300 new recordings. Some well-known artists have contributed to the Smithsonian Folkways collection, including Pete Seeger, Ella Jenkins, Woody Guthrie, and Lead Belly. Famous songs include "This Land Is Your Land", "Goodnight, Irene", and " Midnight Speci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carroll County, Virginia
Carroll County is a United States county located in the southwestern part of the Commonwealth of Virginia. Roughly one fifth of the county lies in the Virginia Piedmont region, while the rest is part of the Appalachian Mountains. The county seat and largest town is Hillsville. The county was established in 1842 from part of Grayson County, and was officially named in honor of Charles Carroll, a signer of the Declaration of Independence. The borders of Carroll County were later expanded by including land from Patrick County. The total size of the county is 478 square miles (1,238 km2), and, as of the 2020 census, the population was 29,155. History The first European settlers arrived in the region in the mid 18th century. These were primarily Scotch-Irish pioneers, who were used to high mountain altitudes. However, early settlement was slow, mostly due to the poor agricultural soil of the area. As a result, lead mining was one of the first economic activities in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grayson County, Virginia
Grayson County is a county located in the southwestern part of the Commonwealth of Virginia. As of the 2020 census, the population was 15,333. Its county seat is Independence. Mount Rogers, the state's highest peak at , is in Grayson County. History Grayson County was founded in 1793 from part of Wythe County. It was named for William Grayson, delegate to the Continental Congress from 1784 to 1787 and one of the first two U.S. Senators from Virginia. The first courthouse was built in Greensville, later called Oldtown, constructed in 1794 and rebuilt beginning in 1832. In 1842, the Virginia General Assembly authorized the division of Grayson County, the northeastern portion becoming Carroll County. During the American Civil War, little fighting occurred within Grayson County,VA. However, the "Grayson Dare Devils" (Company F, 4th Regiment of the Stonewall Brigade) were recruited from the Elk Creek Valley of Grayson County shortly after Virginia seceded, and sustained signific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bilateria
The Bilateria or bilaterians are animals with bilateral symmetry as an embryo, i.e. having a left and a right side that are mirror images of each other. This also means they have a head and a tail (anterior-posterior axis) as well as a belly and a back (ventral-dorsal axis). Nearly all are bilaterally symmetrical as adults as well; the most notable exception is the echinoderms, which achieve secondary pentaradial symmetry as adults, but are bilaterally symmetrical during embryonic development. Most animals are bilaterians, excluding sponges, ctenophores, placozoans and cnidarians. For the most part, bilateral embryos are triploblastic, having three germ layers: endoderm, mesoderm, and ectoderm. Except for a few phyla (i.e. flatworms and gnathostomulids), bilaterians have complete digestive tracts with a separate mouth and anus. Some bilaterians lack body cavities ( acoelomates, i.e. Platyhelminthes, Gastrotricha and Gnathostomulida), while others display primary body cavities (de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolutionary Developmental Biology
Evolutionary developmental biology (informally, evo-devo) is a field of biological research that compares the developmental processes of different organisms to infer how developmental processes evolved. The field grew from 19th-century beginnings, where embryology faced a mystery: zoologists did not know how embryonic development was controlled at the molecular level. Charles Darwin noted that having similar embryos implied common ancestry, but little progress was made until the 1970s. Then, recombinant DNA technology at last brought embryology together with molecular genetics. A key early discovery was of homeotic genes that regulate development in a wide range of eukaryotes. The field is composed of multiple core evolutionary concepts. One is deep homology, the finding that dissimilar organs such as the eyes of insects, vertebrates and cephalopod molluscs, long thought to have evolved separately, are controlled by similar genes such as ''pax-6'', from the evo-devo gene toolk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Systems Biology
Systems biology is the computational modeling, computational and mathematical analysis and modeling of complex biological systems. It is a biology-based interdisciplinary field of study that focuses on complex interactions within biological systems, using a holistic approach (holism instead of the more traditional reductionist, reductionism) to biological research. Particularly from the year 2000 onwards, the concept has been used widely in biology in a variety of contexts. The Human Genome Project is an example of applied systems thinking in biology which has led to new, collaborative ways of working on problems in the biological field of genetics. One of the aims of systems biology is to model and discover emergent property, emergent properties, properties of cell (biology), cells, tissue (biology), tissues and organisms functioning as a system whose theoretical description is only possible using techniques of systems biology. These typically involve metabolic networks or cell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
