Title By Description Created Last modifiedsort descending
Matthew Stanley Meselson (1930– ) Victoria Hernandez 2017-05-23 4 Jul 2018 - 4:40:59am
What Every Mother Should Know (1914), by Margaret Sanger Lakshmeeramya Malladi What Every Mother Should Know was published in 1914 in New York City, New York, as a compilation of newspaper articles written by Margaret Sanger in 1911. The series of articles informed parents about how to teach their children about reproduction and it appeared in the newspaper New York Call. In 1911, the newspaper series was published as a book, with several subsequent editions appearing later. In What Every Mother Should Know, Sanger emphasizes starting education on reproduction early and honestly answering children’s questions. 2017-10-24 4 Jul 2018 - 4:40:59am
Warren Harmon Lewis (1870-1964) Kimberly A. Buettner As one of the first to work at the Carnegie Institution of Washington Department of Embryology, Warren Harmon Lewis made a number of contributions to the field of embryology. In addition to his experimental discoveries on muscle development and the eye, Lewis also published and revised numerous works of scientific literature, including papers in the Carnegie Contributions to Embryology and five editions of Gray's Anatomy. 2007-11-01 4 Jul 2018 - 4:40:59am
Embryo Blotting Paper Models Karen Wellner Anatomical models have always been a mainstay of descriptive embryology. As the training of embryologists grew in the late 1800s, so too did the need for large-scale teaching models. Embryo wax models, such as those made by Adolf Ziegler and Gustav Born, were popular in the latter part of the nineteenth century and the early twentieth century as a way to visualize, in three dimensions, the fine detail of embryos without the aid of a microscope. 2010-11-17 4 Jul 2018 - 4:40:59am
Spemann-Mangold Organizer Samuel Philbrick, Erica O'Neil The Spemann-Mangold organizer, also known as the Spemann organizer, is a cluster of cells in the developing embryo of an amphibian that induces development of the central nervous system. Hilde Mangold was a PhD candidate who conducted the organizer experiment in 1921 under the direction of her graduate advisor, Hans Spemann, at the University of Freiburg in Freiburg, German. The discovery of the Spemann-Mangold organizer introduced the concept of induction in embryonic development. 2012-01-12 4 Jul 2018 - 4:40:59am
Paul Eugen Bleuler (1857–1939) Jessica Resnick Paul Eugen Bleuler studied autism and schizophrenia, among other psychiatric disorders, throughout continental Europe in the early twentieth century. Bleuler worked as a psychiatrist caring for patients with psychiatric disorders at a variety of facilities in Europe. In 1908, Bleuler coined the term schizophrenia to describe a group of diseases that cause changes in thought processes and behavior in humans as well as difficulties relating to the world. 2017-04-06 4 Jul 2018 - 4:40:59am
Advanced Cell Technology, Inc. Lijing Jiang Advanced Cell Technology, Inc. (ACT) is a biotechnology company that uses stem cell technology to develop novel therapies in the field of regenerative medicine. Formed in 1994, ACT grew from a small agricultural cloning research facility located in Worcester, Massachusetts, into a multi-locational corporation involved in using both human embryonic stem cells (hESC) and human adult stem cells as well as animal cells for therapeutic innovations. 2010-06-25 4 Jul 2018 - 4:40:59am
Gastrulation in Gallus gallus (Domestic Chicken) Corinne DeRuiter, Maria Doty Gastrulation is an early stage in embryo development in which the blastula reorganizes into three germ layers: the ectoderm, the mesoderm, and the endoderm. Gastrulation occurs after cleavage but before neurulation and organogenesis. Ernst Haeckel coined the term; gaster, meaning stomach in Latin, is the root for gastrulation, as the gut is one of the most unique creations of the gastrula. 2011-06-21 4 Jul 2018 - 4:40:59am
Multi-Fetal Pregnancy Corinne DeRuiter In humans, multi-fetal pregnancy occurs when a mother carries more than one fetus during the pregnancy. The most common multi-fetal pregnancy is twins, but mothers have given birth to up to eight children (octuplets) from a single pregnancy. Multiple fetusus can result from the release of multiple eggs or multiple ovulations, the splitting of a single fertilized egg, and fertility treatments such as in vitro fertilization (IVF) which involves the insertion of many fertilized eggs into the mother's uterus. 2012-01-01 4 Jul 2018 - 4:40:59am
Human Papillomavirus (HPV) Strains 16 and 18 Grace Kim The Human Papillomavirus (HPV) strains 16 and 18 are the two most common HPV strains that lead to cases of genital cancer. HPV is the most commonly sexually transmitted disease, resulting in more than fourteen million cases per year in the United States alone. When left untreated, HPV leads to high risks of cervical, vaginal, vulvar, anal, and penile cancers. In 1983 and 1984 in Germany, physician Harald zur Hausen found that two HPV strains, HPV-16 and HPV-18, caused cervical cancer in women. In the early twenty first century, pharmaceutical companies Merck & Co. 2017-07-19 4 Jul 2018 - 4:40:59am
Shoukhrat Mitalipov and Masahito Tachibana’s Mitochondrial Gene Replacement in Primate Offspring and Embryonic Stem Cells (2009) Giselle Lee Shoukhrat Mitalipov, Masahito Tachibana, and their team of researchers replaced the mitochondrial genes of primate embryonic stem cells via spindle transfer. Spindle replacement, also called spindle transfer, is the process of removing the genetic material found in the nucleus of one egg cell, or oocyte, and placing it in another egg that had its nucleus removed. Mitochondria are organelles found in all cells and contain some of the cell’s genetic material. Mutations in the mitochondrial DNA can lead to neurodegenerative and muscle diseases. 2018-01-10 4 Jul 2018 - 4:40:59am
Epidermal Growth Factor Adam R. Navis Epidermal growth factor is a signaling molecule that stimulates the growth of epidermal tissues during development and throughout life. Stanley Cohen discovered epidermal growth factor (EGF) during studies of nerve growth factor as a side effect of other experiments. EGF stimulates tissue growth by initiating a variety of cellular mechanisms. This work led to the 1986 Nobel Prize in Physiology or Medicine awarded to Cohen and Rita Levi-Montalcini. 2007-10-30 4 Jul 2018 - 4:40:59am
J. B. v. M. B. (2001) Jennifer E. Chapman In 2001, the Supreme Court of New Jersey decided a dispute between a divorced couple over cryopreserved preembryos created through in vitro fertilization (IVF) during the coupleÕs marriage. The former wife (J.B.) wanted the preembryos destroyed, while her former husband (M.B.) wanted them to be used for future implantation attempts, such as by an infertile couple. In J.B. v. M.B. (2001), the court declined to force J.B. to become a parent against her will, concluding that doing so would violate state public policy. 2013-11-17 4 Jul 2018 - 4:40:59am
An Atlas of Fertilization and Karyokinesis of the Ovum (1895), by Edmund Beecher Wilson Kevin M. Gleason Edmund Beecher Wilson in the US published An Atlas of Fertilization and Karyokinesis of the Ovum (hereafter called An Atlas) in 1895. The book presents photographs by photographer Edward Leaming that capture stages of fertilization, the fusion of sperm and egg and early development of sea urchin (Toxopneustes variegatus) ova, or egg cell. Prior to An Atlas, no one photographed of eggcell division in clear detail. Wilson obtained high quality images of egg cells by cutting the cells into thin sections and preserving them throughout different stages of development. 2017-04-20 4 Jul 2018 - 4:40:59am
Weber v. Stony Brook Hospital (1983) Jack Resnik The New York Court of Appeals' 1983 case Weber v. Stony Brook set an important precedent upholding the right of parents to make medical decisions for newborns born with severe congenital defects. A pro-life New York attorney, Lawrence Washburn, attempted to legally intervene in the case of Baby Jane Doe, an infant born with disorders. When the infant's parents chose palliative care over intensive corrective surgery, Washburn made repeated attempts to have the New York courts force through the surgery. 2011-04-25 4 Jul 2018 - 4:40:59am
Nicole Le Douarin and Charles Ordahl's Experiments on the Developmental Lineages of Somites Corinne DeRuiter Through various studies developmental biologists have been able to determine that the muscles of the back, ribs, and limbs derive from somites. Somites are blocks of cells that contain distinct sections that diverge into specific types (axial or limb) of musculature and are an essential part of early vertebrate development. For many years the musculature of vertebrates was known to derive from the somites, but the exact developmental lineage of axial and limb muscle progenitor cells remained a mystery until Nicole Le Douarin and Charles P. 2011-01-31 4 Jul 2018 - 4:40:59am
Pope Innocent XI (1611-1689) Katherine Brind'Amour, Benjamin Garcia Pope Innocent XI, born Benedetto Odescalchi, made considerable contributions to the Roman Catholic approach to embryology by condemning several propositions on liberal moral theology in 1679, including two related to abortion and ensoulment. His rejection of these principles strengthened the Church's stance against abortion and for the idea of "hominization," meaning the presence of human qualities before birth. 2007-11-11 4 Jul 2018 - 4:40:59am
Human Fertilisation and Embryology Authority (1991- ) Sarah Taddeo In 1991, the United Kingdom established the Human Fertilisation and Embryology Authority (HFEA) as a response to technologies that used human embryos. The HFEA is a regulatory power of the Health and Social Services Department in London, UK, that oversees the implementation of reproductive technologies and the use of embryos in research within the United Kingdom. It establishes protocols by which researchers may use human embryos, develops legislation on how human embryos are stored and 2014-10-30 4 Jul 2018 - 4:40:59am
Alan Mathison Turing (1912-1954) Julia Damerow Alan Mathison Turing was a British mathematician and computer scientist who lived in the early twentieth century. Among important contributions in the field of mathematics, computer science, and philosophy, he developed a mathematical model of morphogenesis. This model describing biological growth became fundamental for research on the process of embryo development. 2010-06-22 4 Jul 2018 - 4:40:59am
Pierre Budin (1846-1907) Kelsey Rebovich Pierre Constant Budin worked in France to improve the lives of newborns and their mothers during the late nineteenth century. Budin stressed the importance of proper nutrition in infants and educated new mothers on breastfeeding and infant care. Budin established infant care facilities and created a nutritional check-up system for infants. Budin helped design early artificial nipples, breast pumps, and incubators for premature newborns. He also began the practice of consulting with new mothers after they gave birth, redefining the roles of obstetricians. 2017-02-11 4 Jul 2018 - 4:40:59am
"Embryonic Stem Cell Lines Derived from Human Blastocytes" (1998), by James Thomson Ke Wu After becoming chief pathologist at the University of Wisconsin-Madison Wisconsin Regional Primate Center in 1995, James A. Thomson began his pioneering work in deriving embryonic stem cells from isolated embryos. That same year, Thomson published his first paper, "Isolation of a Primate Embryonic Stem Cell Line," in Proceedings of the National Academy of Sciences of the United States of America, detailing the first derivation of primate embryonic stem cells. In the following years, Thomson and his team of scientists - Joseph Itskovitz-Eldor, Sander S. Shapiro, Michelle A. 2011-02-01 4 Jul 2018 - 4:40:59am
Milan Vuitch (1915–1993) Victoria Higginbotham Milan Vuitch was an abortion provider in the twentieth century, who performed thousands of abortions in Washington, DC, at a time when abortions were legal only if they preserved the life or health of the pregnant woman. Vuitch was a frequent critic of Washington DC’s anti-abortion law and was arrested multiple times for providing abortions that were not considered necessary to preserve the pregnant woman’s life. After several arrests, Vuitch challenged the law under which he had been arrested, and his case made its way to the Supreme Court in Vuitch v. United States. 2018-06-09 4 Jul 2018 - 4:40:59am
Human Evolution Inferred from Tooth Growth and Development Kate MacCord 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, they form a hard outer substance, called enamel, through a process called amelogenesis. During amelogenesis, incremental layers of enamel form in a Circadian rhythm. This rhythmic deposition leaves the enamel with microstructures, called cross-striations and striae of Retzius, which have a regular periodicity. 2013-03-28 4 Jul 2018 - 4:40:59am
Teratogens Chanapa Tantibanchachai Teratogens are substances that may produce physical or functional defects in the human embryo or fetus after the pregnant woman is exposed to the substance. Alcohol and cocaine are examples of such substances. Exposure to the teratogen affects the fetus or embryo in a variety of ways, such as the duration of exposure, the amount of teratogenic substance, and the stage of development the embryo or fetus is in during the exposure. 2014-01-22 4 Jul 2018 - 4:40:59am
Mary-Claire King (1946– ) Meilin Zhu Mary-Claire King studied genetics in the US in the twenty-first century. King identified two genes associated with the occurrence of breast cancer, breast cancer 1 (BRCA1) and breast cancer 2 (BRCA2). King showed that mutated BRCA1 and BRCA2 genes cause two types of reproductive cancer, breast and ovarian cancer. Because of King’s discovery, doctors can screen women for the inheritance of mutated BRCA1 and BRCA2 genes to evaluate their risks for breast and ovarian cancer. 2017-08-23 4 Jul 2018 - 4:40:59am
The China-US Study on the Prevention of Neural Tube Defects using Folic Acid (1999) Lauren Lynch, Dorothy Regan Haskett From 1993 to 1995 researchers led by Robert J. Berry from the US Centers for Disease Control headquartered in Atlanta, Georgia, and Zhu Li from Beijing Medical University in Beijing, China, conducted a collaborative study in China on the prevention of neural tube defects or NTDs using folic acid supplements. NTDs are birth defects in which openings in the spinal cord or the brain that occur during early development remain after birth. Neural-tube formation occurs in early pregnancy, often before a woman knows she is pregnant and therefore before she has begun taking prenatal vitamins. 2017-10-11 4 Jul 2018 - 4:40:59am
Teratomas Christina Raup Teratomas are embryonal tumors that normally arise from germ cells and are typically benign. They are defined as being composed either of tissues that are foreign to the area in which they form, or of tissues that derive from all three of the germ layers. Malignant teratomas are known as teratocarcinomas; these cancerous growths have played a pivotal role in the discovery of stem cells. "Teratoma" is Greek for "monstrous tumor"; these tumors were so named because they sometimes contain hair, teeth, bone, neurons, and even eyes. 2010-07-01 4 Jul 2018 - 4:40:59am
Leonardo da Vinci's Embryological Annotations Hilary Gilson Among his myriad scientific and artistic contributions, Leonardo da Vinci's work in embryology was groundbreaking. He observed and diagramed the previously undemonstrated position of the fetus in the womb with detailed accompanying annotations of his observations. Leonardo was highly paranoid of plagiarism and wrote all of his notes in mirror-like handwriting laden with his own codes, making his writing difficult to discern and delaying its impact. 2008-08-19 4 Jul 2018 - 4:40:59am
John Bertrand Gurdon (1933- ) Inbar Maayan, Sean Cohmer Sir John Bertrand Gurdon further developed nuclear transplantation, the technique used to clone organisms and to create stem cells, while working in Britain in the second half of the twentieth century. Gurdon's research built on the work of Thomas King and Robert Briggs in the United States, who in 1952 published findings that indicated that scientists could take a nucleus from an early embryonic cell and successfully transfer it into an unfertilized and enucleated egg cell. 2012-10-11 4 Jul 2018 - 4:40:59am
Camillo Golgi (1843–1926) Isra Mishqat Camillo Golgi studied the central nervous system during the late nineteenth and early twentieth centuries in Italy, and he developed a staining technique to visualize brain cells. Called the black reaction, Golgi’s staining technique enabled him to see the cellular structure of brain cells, called neurons, with much greater precision. Golgi also used the black reaction to identify structures within animal cells like the internal reticular apparatus that stores, packs, and modifies proteins, later named the Golgi apparatus in his honor. 2017-02-23 4 Jul 2018 - 4:40:59am
Charles Bonnet (1720-1793) Cera R. Lawrence Charles Bonnet was a naturalist and philosopher in the mid eighteenth century. His most important contribution to embryology was the discovery of parthenogenesis in aphids, proving that asexual reproduction of offspring was possible. In his later life, he was an outspoken defender of the theory of generation now known as preformationism, which stated that offspring exist prior to conception preformed in the germ cell of one of their parents. 2009-06-10 4 Jul 2018 - 4:40:59am
"Generation of Induced Pluripotent Stem Cells Using Recombinant Proteins" (2009), by Hongyan Zhou et al. Samuel Philbrick Induced pluripotent stem cells (iPSCs) are studied carefully by scientists not just because they are a potential source of stem cells that circumvents ethical controversy involved with experimentation on human embryos, but also because of their unique potential to advance the field of regenerative medicine. First generated in a lab by Kazutoshi Takahashi and Shinya Yamanaka in 2006, iPSCs have the ability to differentiate into cells of all types. 2010-08-30 4 Jul 2018 - 4:40:59am
Johann Gregor Mendel (1822-1884) Amanda Andrei Johann Gregor Mendel studied plants and their patterns of inheritance in Austria during the nineteenth century. Mendel experimented with the pea plant, Pisum, and his publication, 'Versuche uber Pflanzenhybriden' (“Experiments on Plant Hybridization”), published in 1866, revolutionized theories of trait inheritance. Mendel’s discoveries relating to factors, traits, and how they pass between generations of organisms enabled scientists in the twentieth century to build theories of genetics. 2013-07-27 4 Jul 2018 - 4:40:59am
Roman v. Roman (2006) Jennifer E. Chapman, Mark Zhang In the case Randy M. Roman v. Augusta N. Roman (2006), the Court of Appeals of Texas followed courts in other states and upheld the validity and enforceability of in vitro fertilization (IVF) consent agreements. The Romans, a divorced couple, each sought different outcomes for their cryopreserved preembryos created during their marriage. Randy Roman sought to have them destroyed, and Augusta Roman sought to implant them in an attempt to have biological children. 2014-05-23 4 Jul 2018 - 4:40:59am
Bowen v. American Hospital Association (1986) Jack Resnik The 1986 US Supreme Court decision Bowen v. American Hospital Association rejected the federal government's use of Section 504 of the Rehabilitation Act of 1973 to intervene in a hospital's treatment for neonates born with severe congenital defects. This case set a precedent for the role of government involvement in cases where parents refused consent for care of disabled newborns. 2012-01-01 4 Jul 2018 - 4:40:59am
Artificial Parthenogenesis and Fertilization (1913), by Jacques Loeb Karen Wellner Jacques Loeb is best known for his embryological work investigating parthenogenesis in invertebrates. Artificial Parthenogenesis and Fertilization is a revised and English-translated work from his earlier book, Die chemische Entwicklungserregung des tierischen Eies (1900). Artificial Parthenogenesis describes Loeb's many and varied methodical experiments to initiate egg development without fertilization by sperm. As is true with much of science, some of Loeb's experiments were successful and many were not. 2010-06-15 4 Jul 2018 - 4:40:59am
James Young Simpson (1811–1870) Nicole Erjavic James Young Simpson was one of the first obstetricians to administer anesthesia during childbirth in nineteenth century Scotland. Before his work in the 1800s, physicians had few ways to reduce the pain of childbirth. Simpson experimented with the use of ether and chloroform, both gaseous chemicals, to temporarily relieve pain. He found that those chemicals both successfully inhibited the pain women felt during childbirth and pain during other surgeries. Patients under the influence of chloroform fell asleep and were unaware of the intense pain of childbirth. 2017-07-23 4 Jul 2018 - 4:40:59am
William Withey Gull (1816-1890) Alexis Abboud William Withey Gull studied paraplegia, anorexia, and hormones as a physician in England during the nineteenth century. In addition to caring for patients, he described the role of the posterior column of the spinal cord in paraplegia, and he was among the first to describe the conditions of anorexia and of hypochondria. He also researched the effects of thyroid hormone deficiencies in women who had malfunctioning thyroid glands. 2017-05-07 4 Jul 2018 - 4:40:59am
China's One-Child Policy Lijing Jiang In September 1979, China's Fifth National People's Congress passed a policy that encouraged one-child families. Following this decision from the Chinese Communist Party (CCP), campaigns were initiated to implement the One-Child Policy nationwide. This initiative constituted the most massive governmental attempt to control human fertility and reproduction in human history. These campaigns prioritized reproductive technologies for contraception, abortion, and sterilization in gynecological and obstetric medicine, while downplaying technologies related to fertility treatment. 2011-03-31 4 Jul 2018 - 4:40:59am
Cocaine as a Teratogen Chanapa Tantibanchachai, Mark Zhang Cocaine use by pregnant women has a variety of effects on the embryo and fetus, ranging from various gastro-intestinal and cardiac defects to tissue death from insufficient blood supply. Thus, cocaine has been termed a teratogen, or an agent that causes defects in fetuses during prenatal development. Cocaine is one of the most commonly used drugs in the US and it has a history of both medical and illegal recreational use. It is a drug capable of a wide array of effects on physical and mental health. 2013-10-17 4 Jul 2018 - 4:40:59am
Lysogenic Bacteria as an Experimental Model at the Pasteur Institute (1915-1965) Valerie Racine Lysogenic bacteria, or virus-infected bacteria, were the primary experimental models used by scientists working in the laboratories of the Pasteur Institute in Paris, France, during the 1950s and 1960s. Historians of science have noted that the use of lysogenic bacteria as a model in microbiological research influenced the scientific achievements of the Pasteur Institute's scientists. 2014-10-10 4 Jul 2018 - 4:40:59am
Pope Sixtus V (1520-1590) Katherine Brind'Amour Known for dropping a long-held distinction in the Catholic Church between the animated and unanimated fetus, Felice Peretti was born in Grottamare, Italy, in 1521, son of a Dalmatian gardener. In his early years, Peretti worked as a swineherd, but soon became involved in the local Minorite convent in Montalto, where he served as a novice at the age of twelve. He went on to study in Montalto, Ferrara, and Bologna, continuing his devotion to religious life, and in 1547 Peretti was ordained as priest in the city of Siena. 2007-11-11 4 Jul 2018 - 4:40:59am
The Apgar Score (1953-1958) Carolina J. Abboud In 1952 Virginia Apgar, a physician at the Sloane Women’s Hospital in New York City, New York, created the Apgar score as a method of evaluating newborn infants’ health to determine if they required medical intervention. The score included five separate categories, including heart rate, breathing rate, reaction to stimuli, muscle activity, and color. An infant received a score from zero to two in each category, and those scores added up to the infant’s total score out of ten. An infant with a score of ten was healthy, and those with low scores required medical attention at birth. 2017-02-16 4 Jul 2018 - 4:40:59am
VACTERL Association Corinne DeRuiter VACTERL association is a term applied to a specific group of abnormalities involving structures derived from the mesoderm. Although the defects of this disorder are clearly linked, VACTERL is called an association rather than a syndrome because the exact genetic cause is unknown. "VACTERL" is an acronym, each letter standing for one of the defects associated with the condition: V for vertebral anomalies, A for anal atresia, C for cardiovascular anomalies, T for tracheoesophageal fistula, E for esophageal atresia, R for renal anomalies, and L for limb defects. 2010-10-29 4 Jul 2018 - 4:40:59am
The Magdalene Sisters (2002) Alexis Darby In 2002, Miramax Entertainment released The Magdalene Sisters, a film that portrays an interpretation of the true events experienced by four young women who were forcibly placed into a Magdalene asylum in Dublin, Ireland, in 1964. Catholic nuns ran Magdalene asylums throughout the world, where they forced women whom society deemed sexually promiscuous to perform hard labor in their laundry facilities. The film portrays the experiences of four women, Margaret, Bernadette, Rose, and Crispina, as they experienced negative treatment from the nuns and sought escape. 2018-06-01 4 Jul 2018 - 4:40:59am
Julius von Sachs (1832-1897) Steve Elliott Julius von Sachs helped establish plant physiology through his experiments in latter nineteenth-century Germany. Sachs infused the inchoate discipline of plant physiology with experimental techniques and a mechanistic stance, both of which cemented his place as one of the discipline s founders. Sachs trained a generation of plant physiologists, and his stress on experimentation and mechanism influenced biologists in other disciplines, especially embryologist Jacques Loeb. 2010-06-07 4 Jul 2018 - 4:40:59am
Barbara McClintock (1902-1992) Federica Turriziani Colonna Barbara McClintock worked on genetics in corn (maize) plants and spent most of her life conducting research at the Cold Spring Harbor Laboratory in Laurel Hollow, New York. McClintock's research focused on reproduction and mutations in maize, and described the phenomenon of genetic crossover in chromosomes. Through her maize mutation experiments, McClintock observed transposons, or mobile elements of genes within the chromosome, which jump around the genome. McClintock received the Nobel Prize for Physiology or Medicine in 1983 for her research on chromosome transposition. 2014-07-05 4 Jul 2018 - 4:40:59am
Hermann Joseph Muller's Study of X-rays as a Mutagen, (1926-1927) Kevin M. Gleason Hermann Joseph Muller conducted three experiments in 1926 and 1927 that demonstrated that exposure to x-rays, a form of high-energy radiation, can cause genetic mutations, changes to an organism's genome, particularly in egg and sperm cells. In his experiments, Muller exposed fruit flies (Drosophila) to x-rays, mated the flies, and observed the number of mutations in the offspring. In 1927, Muller described the results of his experiments in "Artificial Transmutation of the Gene" and "The Problem of Genic Modification". 2017-03-07 4 Jul 2018 - 4:40:59am
Katharina Dorothea Dalton (1916–2004) Bianca Zietal Katharina Dorothea Dalton was a physician in England in the twentieth century who defined premenstrual syndrome (PMS) as a cluster of symptoms suspected to begin one to two weeks before menstruation and disappear upon the onset of a new menstrual cycle. Prior to Dalton, there was little research on pre-menstrual issues and those that existed linked the problem to excessive water retention or estrogen. Dalton hypothesized that PMS resulted from a deficiency in the hormone progesterone and advocated for hormone replacement therapy to lessen the symptoms of the syndrome. 2017-05-24 4 Jul 2018 - 4:40:59am
Lazzaro Spallanzani (1729-1799) Mary E. Sunderland Lazzaro Spallanzani's imaginative application of experimental methods, mastery of microscopy, and wide interests led him to significant contributions in natural history, experimental biology, and physiology. His detailed and thoughtful observations illuminated a broad spectrum of problems ranging from regeneration to the genesis of thunderclouds. 2007-11-01 4 Jul 2018 - 4:40:59am