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Oogenesis – Embryology

Posted: Published on April 22nd, 2014

Of the roughly 500'000 follicles that are present in the two ovaries at the beginning of sexual maturity, only around 480 reach the graafian follicle stage and are thus able to release oocytes (ovulation). This number is simply derived by multiplying the number of cycles per year (12) and the number of years in which a woman is fertile (40). Cyclic changes in the hormone household (hormonal cycle), governed by the hypothalamic-pituitary system, are responsible for the periodicity of the ovulation. In a woman, the rhythmic hormonal influence leads to the following cyclic events: In the center of this hormonal control is the hypothalamamics-hypophysial (pituitary gland) system with the two hypophysial gonadotropins FSH and LH. The pulsating liberation of GnRH by the hypothalamus is the fundamental precondition for a normal control of the cyclic ovarian function. This cyclic activity releases FSH and LH, both of which stimulate the maturation of the follicles in the ovary and trigger ovulation. During the ovarian cycle, estrogen is produced by the theca interna and follicular cells (in the so-called follicle phase) and progesterone by the corpus luteum (so-called luteal phase). Definitions GnRH: Gonadotropin- releasing hormone FSH: Follicle-stimulating hormone LH: Luteinizing hormone As a rule, … Continue reading →

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Ftb Unleashed episode 28! More bees and DNA – Video

Posted: Published on April 22nd, 2014

Ftb Unleashed episode 28! More bees and DNA DNA!! man! WOoo! More bees! Wooo!!! Twitter https://twitter.com/Robtheinsane/ https://www.facebook.com/Vekpos1329 Ftb website: http://www.feed-the-beast.com Song to the intro: Tough Guy by Celldwell... By: Vekpos2913 … Continue reading →

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DNA – Youre Not Mine LIVE- feat. Thorsten Koehne (Edens Curse) – Video

Posted: Published on April 22nd, 2014

DNA - Youre Not Mine LIVE- feat. Thorsten Koehne (Edens Curse) DNA performing live their brandnew single "Youre not mine" (Garm/Laskowski) @Klangzirkus Celle on SA.12 of April 2014 feat. Thorsten Koehne (Edens Curse) on lead guitar, Gerry Garm on vox./guit... By: Mark Machado … Continue reading →

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Forensic Pt. 1: Perfecting DNA Profiling – Video

Posted: Published on April 22nd, 2014

Forensic Pt. 1: Perfecting DNA Profiling None-- Created using PowToon -- Free sign up at http://www.powtoon.com/ . Make your own animated videos and animated presentations for free. PowToon is a free tool that allows you to develop... By: Nanthawat Mualprasert … Continue reading →

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DNA Eternal Bodies – Tip of the Iceberg Part 4 (1a) – Video

Posted: Published on April 22nd, 2014

DNA Eternal Bodies - Tip of the Iceberg Part 4 (1a) This is the first part to a series I will be sharing on the direction that Genetics and DNA research is heading, and this discovery of what is called "The God Gene." I will be bringing out... By: Paul Woodward … Continue reading →

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Medical staff collect DNA samples from relatives of missing passengers – Video

Posted: Published on April 22nd, 2014

Medical staff collect DNA samples from relatives of missing passengers The search is now in its fifth day,... and hope is diminishing that survivors will be found. Medical staff have begun collecting DNA samples from the familie... By: ARIRANG NEWS … Continue reading →

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William Shih (Harvard) Part 2: Nanofabrication via DNA Single Stranded Bricks – Video

Posted: Published on April 22nd, 2014

William Shih (Harvard) Part 2: Nanofabrication via DNA Single Stranded Bricks http://www.iBiology.org Talk Overview: Shih describes how DNA can be used as a building material to construct nanoscale objects. A long strand of DNA can be made to fold into a flat "sheet"... By: iBiology … Continue reading →

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DNA Wealth Blueprint Review | Watch this BEFORE you Buy! – Video

Posted: Published on April 22nd, 2014

DNA Wealth Blueprint Review | Watch this BEFORE you Buy! Click HERE to join my team now: http://marketingsolutionsmama.com DNA Wealth Blueprint Review Are you looking for a way to make money from home? You have probably stumbled upon a lot of ways... By: Online Marketing Solutions … Continue reading →

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DNA from the Beginning – An animated primer of 75 …

Posted: Published on April 22nd, 2014

DNA from the Beginning is organized around key concepts. The science behind each concept is explained by: animation, image gallery, video interviews, problem, biographies, and links. DNAftb blog: It's the season of hibernation, something I've always wished I could do. Oh, to wrap up in a ball, sleep away the winter, and wake to a beautiful spring day like Bambi! Although the thought has always intrigued me, it never really occurred to me what a feat hibernation actually is. It turns out that all of the bears, squirrels, rabbits ... that I thought were just sleeping, are breaking biological laws!! If I was to stay dormant for 5 months, without food or drink and little to no movement in freezing temperatures [...] Feature: We have relaunched the Weed to Wonder site as a flexible "e-book" that can be viewed as a website, an app, or a printable PDF. Mailing List Gene News - Scientists find protein that unites cell and egg Find the DNALC on: Language options: Original post: DNA from the Beginning - An animated primer of 75 ... … Continue reading →

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A Science Odyssey: You Try It: DNA Workshop

Posted: Published on April 22nd, 2014

Go directly to DNA Workshop Activity (92K - requires Shockwave) An embryonic cell divides again and again. Where there was one cell there are two, then four, then eight,... Each holds all the genetic information needed to create a human being. How, exactly, do these cells make copies of themselves? Hair grows from your head, nonstop, day in and day out. The cells of your hair follicles somehow generate all of the protein that make up this hair. How is this protein created? The answers to these questions are DNA replication and protein synthesis. Knowledge of the structure of DNA began with the discovery of nucleic acids in 1869. That genes control the synthesis of enzymes was understood in the 1940s. In 1953, an accurate model of the DNA molecule was presented, thanks to the work of Rosalind Franklin, James Watson, and Francis Crick. The activity in this section places you within the cell, involving you with the processes of DNA replication and protein synthesis. If you're interested in finding out more about DNA and protein synthesis, check out the other sections. Related People and Discoveries entries Read more: A Science Odyssey: You Try It: DNA Workshop … Continue reading →

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