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Telomeres and Telomerase in Cellular Aging (Senescence)
By: Zane Bartlett
| Published: Feb 11, 2015
Telomeres are sequences of DNA on the ends of chromosomes that protect chromosomes from sticking to each other or tangling, which could cause…
TelomeraseGreider, Carol W.Wistar Institute of Anatomy and BiologyAgingDNA
John Langdon Down (1828–1896)
By: Risa Aria Schnebly, Grace Fitzgerald
| Published: Aug 12, 2021
John Langdon Down studied medicine in England in the nineteenth century and was one of the first people to develop a complete description of the…
Down syndromeDevelopmental DisabilitiesPartial Trisomy 21 Down SyndromeTrisomyPartial Trisomy
Preimplantation Genetic Diagnosis
By: Nathalie Antonios
| Published: Mar 24, 2011
Preimplantation genetic diagnosis (PGD) involves testing for specific genetic conditions prior to the implantation of an embryo in the uterine wall.…
TechnologyPreimplantation DiagnosisReproductionFertilizationgenetic testing
Charles Darwin's Theory of Pangenesis
By: Yawen Zou
| Published: Jul 20, 2014
In 1868 in England, Charles Darwin proposed his pangenesis theory to describe the units of inheritance between parents and offspring and the…
HeredityDarwin, Charles, 1809-1882ReproductionEvolutionNatural selection
The First Successful Cloning of a Gaur (2000), by Advanced Cell Technology
By: Caroline Appleton
| Published: Jul 26, 2013
Advanced Cell Technology (ACT), a stem cell biotechnology company in Worcester, Massachusetts, showed the potential for cloning to contribute to…
Cell nuclei--TransplantationCloningGaurAdvanced Cell Technology (Firm)Embryos
Telomerase in Human Development
By: Zane Bartlett
| Published: Mar 23, 2015
Telomerase is an enzyme that regulates the lengths of telomeres in the cells of many organisms, and in humans it begins to function int the early…
TelomeraseTelomereDNAMolecular BiologySomatic embryogenesis
David Phillip Vetter (1971–1984)
By: Maggie Zhou
| Published: Aug 01, 2024
David Phillip Vetter was born with X-linked severe combined immunodeficiency disorder, or X-SCID, and spent most of his life in an isolated sterile…
X-Linked Combined Immunodeficiency DiseasesX-Linked SCIDSevere Combined ImmunodeficiencyBone Marrow--TransplantationAutoimmune Diseases
Elizabeth Blackburn, Carol Greider and Jack Szostak's Telomere and Telomerase Experiments (1982-1989)
By: Zane Bartlett
| Published: Mar 24, 2015
Experiments conducted by Elizabeth Blackburn, Carol Greider, and Jack Szostak from 1982 to 1989 provided theories of how the ends of chromosomes,…
TelomereGreider, Carol W.Chromosome replicationTelomeraseDNA
The Hayflick Limit
By: Zane Bartlett
| Published: Nov 14, 2014
The Hayflick Limit is a concept that helps to explain the mechanisms behind cellular aging. The concept states that a normal human cell can only…
CellsCell populationsCell DeathApoptosisCell Proliferation
Lap-Chee Tsui (1950-)
By: Kristina Winikates
| Published: Nov 10, 2011
Lap-Chee Tsui is a geneticist who discovered the cystic fibrosis (CF) gene, and his research team sequenced human chromosome 7. As the location of…
PeopleTsui, Lap-CheeCystic FibrosisReproductionBiography