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Human Evolution Inferred from Tooth Growth and Development
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2013-04-05)
To study human evolution, researchers sometimes use microstructures found in human teeth and their knowledge of the processes by which those structures grow. Human fetusus begin to develop teeth in utero. As teeth grow, ...
The Process of Implantation of Embryos in Primates
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2013-04-05)
Implantation is a process in which a developing embryo, moving as a blastocyst through a uterus, makes contact with the uterine wall and remains attached to it until birth. The lining of the uterus (endometrium) prepares ...
Preformationism in the Enlightenment
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2012-05-10)
Preformationism was a theory of embryological development used in the late seventeenth through the late eighteenth centuries. This theory held that the generation of offspring occurs as a result of an unfolding and growth ...
Biological Clocks and the Formation of Human Tooth Enamel
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2013-03-18)
Tooth enamel contains relics of its formation process, in the form of microstructures, which indicate the incremental way in which it forms. These microstructures, called cross-striations and striae of Retzius, develop as ...
Dinosaur Egg Parataxonomy
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2015-03-23)
Dinosaur egg parataxonomy is a classification system that organizes dinosaur eggs by descriptive features such as shape, size, and shell thickness. Though egg parataxonomy originated in the nineteenth century, Zi-Kui Zhao ...
Retinoids As Teratogens
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2014-02-28)
Vitamin A (retinol) is an essential vitamin in the daily functioning of human beings that helps regulate cellular differentiation of epithelial tissue. Studies have shown that an excess of vitamin A can affect embryonic ...
Purkinje Cells
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2014-08-13)
Purkinje cells, also called Purkinje neurons, are neurons in vertebrate animals located in the cerebellar cortex of the brain. Purkinje cell bodies are shaped like a flask and have many threadlike extensions called dendrites, ...
Angelman Syndrome
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2014-08-13)
Angelman syndrome is a disorder in humans that causes neurological symptoms such as lack of speech, jerky movements, and insomnia. A human cell has two copies of twenty-three chromosomes for a total of forty-six-one copy ...
The Discovery of The Dikika Baby Fossil as Evidence for Australopithecine Growth and Development
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2015-02-02)
When scientists discovered a 3.3
million-year-old skeleton of a child of the human lineage (hominin) in
2000, in the village of Hadar, Ethiopia, they were able to study growth
and development of Australopithecus
afarensis, ...
George W. Beadle's One Gene-One Enzyme Hypothesis
(Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia., 2014-05-23)
The one gene-one enzyme hypothesis, proposed by George Wells Beadle in the US in 1941, is the theory that each gene directly produces a single enzyme, which consequently affects an individual step in a metabolic pathway. ...