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Sea Urchin Fertilization
 
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This 3D animation describe the sea urchin fertilization at cell biology level.
Views: 94557 Lei Jin
Sea Urchin Development  Biological experiment
 
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This video is created to understand the Development & Metamorphosis of Sea Urchin for hight school student. Production&Writing: Masahiro Yajima ,Japan
Views: 8245 矢嶋正博
08 06SeaUrchinTimeLapse SV
 
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Sea Urchin Embryonic Development (time lapse) Video This series of video clips shows selected important events in sea urchin embryonic development. 1) The unfertilized egg is about 100 micrometers (µm) in diameter, similar to that of humans, and is surrounded by an extracellular layer called the vitelline layer. Upon fertilization by the first sperm, the vitelline layer becomes raised off the surface of the egg and hardens, forming the protective structure known as the fertilization envelope. All cleavages up to the blastula stage occur within this envelope. 2) During first cleavage, the nuclear envelope breaks down, and the duplicated chromosomes separate into two complete sets, followed by cytokinesis. In the two new cells, or blastomeres, you can clearly see the two new nuclei. 3) Second cleavage, progressing from 2 to 4 cells, is seen here. Cleavages will proceed synchronously, approximately every 30 minutes, passing through the morula stage (16-64 cells) when the cells are loosely attached to each other, up to the blastula stage (more than 128 cells). 4) The blastula stage is seen at the end of this clip. This stage is made up of a hollow ball of 1000 or so cells, arranged in a single-layered epithelium. The cells are tightly packed together, maintaining a space in the center called the blastocoel cavity. 5) At the beginning of gastrulation, a number of cells in the flattened "vegetal pole," shown here at the bottom of the embryo, move as individual cells into the blastocoel cavity. In this cavity the cells migrate around, fuse with each other in a ring, and begin secreting elements of the calcium carbonate skeleton of the embryo. Because these cells are the first to move as individual cells in the embryo, they are called the primary mesenchyme cells (PMCs). The remaining cells in the vegetal pole fill in the gaps, restoring a complete epithelial sheet. 6) While the PMCs are migrating around, archenteron formation, or formation of the embryonic digestive tract, begins. The first stage involves the pushing in of the vegetal pole to form a short, wide, blind-ended tube. 7) This tube then narrows and elongates by a process that includes extensive cell rearrangement. Following this elongation, a subset of cells (secondary mesenchyme cells) at the tip of the archenteron will extend processes that contact a specific site on the inside of the ectodermal wall and tow the archenteron toward that spot. The wall of the ectoderm will bend inward and fuse with the tip of the archenteron to form the mouth. The digestive tract will differentiate into an esophagus, a stomach, and an intestine, and the embryo will begin to feed. Four to 8 or 12 arms will extend, supported by internal skeletal elements. This feeding larva will float around in the plankton, eating algal cells, for 5 or 6 weeks, then will metamorphose into the adult form of the sea urchin. Credit: Rachel Fink, editor, "A Dozen Eggs," Society for Developmental Biology
Views: 18528 Chandra Brown
How I became part sea urchin | Catherine Mohr
 
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As a young scientist, Catherine Mohr was on her dream scuba trip -- when she put her hand right down on a spiny sea urchin. While a school of sharks circled above. What happened next? More than you can possibly imagine. Settle in for this fabulous story with a dash of science. Check out more TED Talks: http://www.ted.com The TED Talks channel features the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes (or less). Look for talks on Technology, Entertainment and Design -- plus science, business, global issues, the arts and more. Follow TED on Twitter: http://www.twitter.com/TEDTalks Like TED on Facebook: https://www.facebook.com/TED Subscribe to our channel: https://www.youtube.com/TED
Views: 66110 TED
Sea urchin development
 
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This developmental biology lecture explains about the sea urchin development including the sea urchin fertilization, prevention of polyspermy and the blastula and gastrulation of sea urchin embryo to produce the adult sea urchin animal. For more information, log on to- http://www.shomusbiology.com/ Get Shomu's Biology DVD set here- http://www.shomusbiology.com/dvd-store/ Download the study materials here- http://shomusbiology.com/bio-materials.html Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Please subscribe to our channel so that we can grow together. You can check for any of the following services from Shomu’s Biology- Buy Shomu’s Biology lecture DVD set- www.shomusbiology.com/dvd-store Shomu’s Biology assignment services – www.shomusbiology.com/assignment -help Join Online coaching for CSIR NET exam – www.shomusbiology.com/net-coaching We are social. Find us on different sites here- Our Website – www.shomusbiology.com Facebook page- https://www.facebook.com/ShomusBiology/ Twitter - https://twitter.com/shomusbiology SlideShare- www.slideshare.net/shomusbiology Google plus- https://plus.google.com/113648584982732129198 LinkedIn - https://www.linkedin.com/in/suman-bhattacharjee-2a051661 Youtube- https://www.youtube.com/user/TheFunsuman Thank you for watching
Views: 13639 Shomu's Biology
Sea Urchin Cell Division Lab
 
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A lab conducted by students on the division of sea urchin cells immediately after fertilization. All of the sources used are cited at the end of the video.
Views: 1246 Ally McDonough
Sea Urchin Embryo, Individual Cell
 
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Sea urchin embryo at blastula stage comport a peripheral epithelium of individually ciliated cells. Each cell possesses one cilium, difficult to visualize because of interference of neighbour cilia. At high magnification, the low depth of field of the 100X objective allows indivisualization of cilium and detailed record of its beating. The last part of the clip shows individual cell that can be detached experimentally.
Views: 61 jacosson
First cleavage of fertilized sea urchin egg cells by MBL Science Journalism Fellows
 
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First cleavage of fertilized sea urchin egg cells. Credit: MBL Logan Science Journalism Fellows.
Views: 924 MBL Woods Hole
Baby sea urchin's first cell division
 
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This video was taken by fellows at the Marine Biological Laboratory Science Journalism Fellowship. The fellows fertilized sea urchin eggs, and made beautiful videos and photos of cells dividing and growing in the earliest stages of life. See the rest at http://boingboing.net/2012/07/02/the-beginning-of-life.html
Views: 3497 Maggie Koerth-Baker
Sperm Cell Toxicity Tests Using the Sea Urchin EPA VIDEO
 
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“Sperm Cell Toxicity Tests Using the Sea Urchin, Arbacia punctulata” (EPA, 2009). The methods illustrated in the video and described in this supplemental guide support the methods published in the U.S. Environmental Protection Agency’s (EPA’s) Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Marine and Estuarine Organisms, Third Edition (EPA, 2002a), referred to as the Saltwater Chronic Methods Manual. The video and this guide provide details on preparing for and conducting the test based on the expertise of personnel at the following EPA Office of Research and Development (ORD) laboratories: National Health and Environmental Effects Research Laboratory (NHEERL) – Atlantic Ecology Division in Narragansett, Rhode Island NHEERL – Gulf Ecology Division in Gulf Breeze, Florida National Exposure Research Lab (NERL) – Ecological Exposure Research Division (EERD) in Cincinnati, Ohio This guide and its accompanying video are part of a series of training videos produced by EPA’s Office of Wastewater Management. This Saltwater Series includes the following videos and guides: “Mysid (Americamysis bahia) Survival, Growth, and Fecundity Toxicity Tests” “Culturing Americamysis bahia” “Sperm Cell Toxicity Tests Using the Sea Urchin, Arbacia punctulata” “Red Algal (Champia parvula) Sexual Reproduction Toxicity Tests” “Sheepshead Minnow (Cyprinodon variegatus) and Inland Silverside (Menidia beryllina) Larval Survival and Growth Toxicity Tests” The Freshwater Series, released in 2006, includes the following videos and guides: “Ceriodaphnia Survival and Reproduction Toxicity Tests” “Culturing of Fathead Minnows (Pimephales promelas)” “Fathead Minnow (Pimephales promelas) Larval Survival and Growth Toxicity Tests” All of these videos are available through the National Service Center for Environmental Publications (NSCEP) at 800 490-9198 or [email protected]
Views: 785 Gustavo Pesce
Sea Urchin Facts: 18 Facts about Sea Urchins
 
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Here are 18 facts about Sea Urchins to help gain a better understanding of these incredible creatures. They are a fascinating species far different from any other species we know, and here we delve into the wonder of these wonderful creatures. Synopsis There are around 200 species of sea urchins that are found across oceans around the world Sea urchins are found in warmer waters on ocean floors close to coral reefs They are a threatened species due to overfishing and pollution They range in size from between 1.2 to 3.9 inches in diameter. They have globe like shape which is covered in long spines and their bodies have a radial symmetry. They are protected by a shell formed of bony plates providing protection for the softer inner organs. They vary in colour depending in the species of the sea urchin. However the majority are black, brown, purple, red or green in color. They have five rows of paired feet on the underside of their body. These feet have suckers in them which means they can grip the ocean floor. Amongst the spines on their bodies are claw like structures which are known as pedicellariae that are used for protection against predators and also to collect food. There are species of sea urchin that also have spikes that are filled with venom They have a unique type of mouth called "Aristotle's lantern". The mouth has five sharp teeth which they use to drill holes in rocks They are omnivores by nature consuming both animals and plant life such as algae sea weed plankton and Other orgainc mattet The main predators of sea urchins are humans sunflower stars crabs fish birds and Sea urchins mate in the spring time and reproduce by releasing eggs and sperm cells in to the water in a process called external fertilization. the Fertilized egg will then go through a larval stage before it becomes a grown adult. Whilst the sea urchin is in its larval stage It will swim with other types of tiny creatures as part of zooplankton Sea urchins live up to 30 years. In fact the red sea urchin lives up to 200 years making it the longest living creature Sea urchins are not aggressive creatures however if they are touched most sea urchins will try to defend themselves using their spines and some species have spines that can pierce a divers suit. Some species like thr purple sea urchin, have an another defense mechanism called thepedicellarines which are tiny, jaw-like structures which clasp onto a diver's skin and inject a powerful poison. They are nestled down between re spines and are difficult to come into contact with unless the diver impales them self on it
Views: 78991 Stand Out Facts
19.2 Sea Urchin Fert
 
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Views: 608 Down Zero
Sea Urchin Embryo Cilia
 
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Each peripheral cell of a sea urchin embryo (blastula stage) possesses on cilium. At high magnification (100X objective), cilia are observed individually while beating by DIC microscopy with stroboscopic illumination. The last part of the clip shows the ciliary anchoring structure present in each cell.
Views: 99 jacosson
Sea Urchins Divide!
 
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Soon after fertilization, we watch as two new sea urchin zygotes divide (mitosis) through eight cycles of synchronized division right up to the point of gastrulation. One can see the nuclei as dark spots in the 'green' cytoplasm. Scale bars and times are included, along with some strange sounds recorded in the deep. Imaged via dark-field microscopy. I apologize for the shaking in the middle - we had to add more sea water to prevent the slide from drying out.
Views: 20438 thesoundofscience
Sea urchin gastrulation
 
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Podcast for students of Zoology 470, UW-Madison, on sea urchin gastrulation. Some images courtesy of Gilbert, Developmental Biology, 10e (Sinauer).
Views: 5016 Jeff Hardin
Developmental biology part 4 : sea urchin fertilization
 
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For more information, log on to- http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-materials.html Fertilisation (also known as conception, fecundation and syngamy) is the fusion of gametes to initiate the development of a new individual organism.[1] In animals, the process involves the fusion of an ovum with a sperm, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilisation, or outside (external fertilisation). The cycle of fertilisation and development of new individuals is called reproduction. Sperm find the eggs via chemotaxis, a type of ligand/receptor interaction. Resact is a 14 amino acid peptide purified from the jelly coat of A. punctulata that attracts the migration of sperm. After finding the egg, the sperm penetrates the jelly coat through a process called sperm activation. In another ligand/receptor interaction, an oligosaccharide component of the egg binds and activates a receptor on the sperm and causes the acrosomal reaction. The acrosomal vesicles of the sperm fuse with the plasma membrane and are released. In this process, molecules bound to the acrosomal vesicle membrane, such as bindin, are exposed on the surface of the sperm. These contents digest the jelly coat and eventually the vitelline membrane. In addition to the release of acrosomal vesicles, there is explosive polymerisation of actin to form a thin spike at the head of the sperm called the acrosomal process. The sperm binds to the egg through another ligand reaction between receptors on the vitelline membrane. The sperm surface protein bindin, binds to a receptor on the vitelline membrane identified as EBR1. Fusion of the plasma membranes of the sperm and egg are likely mediated by bindin. At the site of contact, fusion causes the formation of a fertilisation cone. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia. Link- http://en.wikipedia.org/wiki/Main_Page
Views: 49536 Shomu's Biology
Sea Urchin Life
 
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This video describes the life of a sea urchin. Using some original experimental data and images borrowed from a variety of sources, we hoped to discuss the anatomy, life cycle (including reproduction), and typical behavior of sea urchins. A list of sources references and images utilized are listed below: Cameron, R. A., Samanta, M., Yuan, A., He, D., & Davidson, E. (2008, November 14). Abstract. National Center for Biotechnology Information. Retrieved March 15, 2013, from http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2686435/ Fertilization - Introduction. (n.d.). Fertilization in Sea Urchins. Retrieved March 15, 2013, from http://worms.zoology.wisc.edu/urchins/SUfert_intro.html Fertilization: Avoiding Polyspermy. (n.d.). Developmental Biology Interactive. Retrieved March 15, 2013, from http://www.devbio.biology.gatech.edu/?page_id=519 Introduction to the Deuterostomia. (n.d.). Introduction to the Deuterostomia. Retrieved March 15, 2013, from http://www.ucmp.berkeley.edu/phyla/deuterostomia.html Runft, L. L., Jaffe, L. A., & Mehlmann, L. M. (n.d.). Egg Activation at Fertilization: Where it all Begins. Uchc.edu. Retrieved March 16, 2013, from http://cell.uchc.edu/pdf/mehlmann/sdarticlerunft.pdf Sea Urchin Fertilization. (2009, April 20). YouTube. Retrieved March 15, 2013, from http://www.youtube.com/watch?v=jp-RgIRgcYE Sea urchin fertilization. (2009, October 30). YouTube. Retrieved March 18, 2013, from http://www.youtube.com/watch?v=T6BtSMerBmw Sea Urchin Genome Project. (n.d.). Sea Urchin Genome Project. Retrieved March 15, 2013, from http://sugp.caltech.edu/SUGP/ Sea Urchins Divide! (2008, September 05). YouTube. Retrieved March 17, 2013, from http://www.youtube.com/watch?v=H0zL4O45eOU Sea Urchins. (n.d.). Sea Urchins. Retrieved March 14, 2013, from http://academics.smcvt.edu/dfacey/aquaticbiology/coastal pages/sea urchins.html SUE - ANATOMY & PHYSIOLOGY. (n.d.). SUE - ANATOMY & PHYSIOLOGY. Retrieved March 14, 2013, from http://www.stanford.edu/group/Urchin/anaphys.html  . (n.d.). SUE. Retrieved March 16, 2013, from http://www.stanford.edu/group/Urchin/gametes.htm
Views: 4429 Sharadram Sundaresan
Developing Sea Urchins
 
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Blastula, Early and Mid gastrula of S. purpuratus (sea urchin)
Views: 2785 MsDCaba
1st Cell Division in Echinometra mathaei
 
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This is a time lapse of the 1st cell division in the sea urchin (Echinometra mathaei). This video is at 10x the speed it was recorded.
Views: 14 Brent Humeston
Sea urchin embryo
 
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This video was taken by fellows at the Marine Biological Laboratory Science Journalism Fellowship. The fellows fertilized sea urchin eggs, and made beautiful videos and photos of cells dividing and growing in the earliest stages of life. See the rest at http://boingboing.net/2012/07/02/the-beginning-of-life.html
Views: 1612 Maggie Koerth-Baker
Sea Urchin Development.mov
 
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Radial cleavage in sea urchin embryological development. Captured by a student using DIC and a Spot camera at the MBL Embryology Course at Woods Hole.
Views: 10200 SPOTImaging
Sea Urchin Fertilization
 
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Views: 26703 bluedoorlabs
Gastrulation
 
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Gastrulation lecture - This lecture explains about the gastrulation process in development. Sea urchin and frog gastrulation creates three germ layers known as ectoderm, mesoderm and endoderm and different organs and organ systems are produced from these three germ layers. This lecture explains the following - Gastrulation in frog Gastrulation in chicken Gastrulation in human Keep watching the lecture to know more about the gastrulation process. For more information, log on to- http://www.shomusbiology.com/ Get Shomu's Biology DVD set here- http://www.shomusbiology.com/dvd-store/ Download the study materials here- http://shomusbiology.com/bio-materials.html Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Please subscribe to our channel so that we can grow together. You can check for any of the following services from Shomu’s Biology- Buy Shomu’s Biology lecture DVD set- www.shomusbiology.com/dvd-store Shomu’s Biology assignment services – www.shomusbiology.com/assignment -help Join Online coaching for CSIR NET exam – www.shomusbiology.com/net-coaching We are social. Find us on different sites here- Our Website – www.shomusbiology.com Facebook page- https://www.facebook.com/ShomusBiology/ Twitter - https://twitter.com/shomusbiology SlideShare- www.slideshare.net/shomusbiology Google plus- https://plus.google.com/113648584982732129198 LinkedIn - https://www.linkedin.com/in/suman-bhattacharjee-2a051661 Youtube- https://www.youtube.com/user/TheFunsuman Thank you for watching the developmental biology lecture on Gastrulation.
Views: 40186 Shomu's Biology
Sea Urchins Pull Themselves Inside Out to be Reborn | Deep Look
 
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Conceived in the open sea, tiny spaceship-shaped sea urchin larvae search the vast ocean to find a home. After this incredible odyssey, they undergo one of the most remarkable transformations in nature. SUBSCRIBE to Deep Look! http://goo.gl/8NwXqt DEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Get a new perspective on our place in the universe. Explore big scientific mysteries by going incredibly small. * NEW VIDEOS EVERY OTHER TUESDAY! * Every summer, millions of people head to the coast to soak up the sun and play in the waves. But they aren’t alone. Just beyond the crashing surf, hundreds of millions of tiny sea urchin larvae are also floating around, preparing for one of the most dramatic transformations in the animal kingdom. Scientists along the Pacific coast are investigating how these microscopic ocean drifters, which look like tiny spaceships, find their way back home to the shoreline, where they attach themselves, grow into spiny creatures and live out a slow-moving life that often exceeds 100 years.“These sorts of studies are absolutely crucial if we want to not only maintain healthy fisheries but indeed a healthy ocean,” says Jason Hodin, a research scientist at the University of Washington’s Friday Harbor Laboratories. http://staff.washington.edu/hodin/ http://depts.washington.edu/fhl/ Sea urchins reproduce by sending clouds of eggs and sperm into the water. Millions of larvae are formed, but only a handful make it back to the shoreline to grow into adults. --- What are sea urchins? Sea urchins are spiny invertebrate animals. Adult sea urchins are globe-shaped and show five-point radial symmetry. They move using a system of tube feet. Sea urchins belong to the phylum Echinodermata along with their relatives the sea stars (starfish), sand dollars and sea slugs. --- What do sea urchins eat? Sea urchins eat algae and can reduce kelp forests to barrens if their numbers grow too high. A sea urchin’s mouth, referred to as Aristotle’s lantern, is on the underside and has five sharp teeth. The urchin uses the tube feet to move the food to its mouth. --- How do sea urchins reproduce? Male sea urchins release clouds of sperm and females release huge numbers of eggs directly into the ocean water. The gametes meet and the sperm fertilize the eggs. The fertilized eggs grow into free-swimming embryos which themselves develop into larvae called plutei. The plutei swim through the ocean as plankton until they drop to the seafloor and metamorphosize into the globe-shaped adult urchins. ---+ Read the entire article on KQED Science: https://ww2.kqed.org/science/2016/08/23/sea-urchins-pull-themselves-inside-out-to-be-reborn/ ---+ For more information: Marine Larvae Video Resource http://marinedevelopmentresource.stanford.edu/ ---+ More Great Deep Look episodes: From Drifter to Dynamo: The Story of Plankton | Deep Look https://www.youtube.com/watch?v=jUvJ5ANH86I Pygmy Seahorses: Masters of Camouflage | Deep Look https://www.youtube.com/watch?v=Q3CtGoqz3ww The Fantastic Fur of Sea Otters | Deep Look https://www.youtube.com/watch?v=Zxqg_um1TXI ---+ See some great videos and documentaries from PBS Digital Studios! It's Okay To Be Smart: Can Coral Reefs Survive Climate Change? https://www.youtube.com/watch?v=P7ydNafXxJI Gross Science: White Sand Beaches Are Made of Fish Poop https://www.youtube.com/watch?v=1SfxgY1dIM4 ---+ Follow KQED Science: KQED Science: http://www.kqed.org/science Tumblr: http://kqedscience.tumblr.com Twitter: https://www.twitter.com/kqedscience ---+ About KQED KQED, an NPR and PBS affiliate in San Francisco, CA, serves Northern California and beyond with a public-supported alternative to commercial TV, Radio and web media. Funding for Deep Look is provided in part by PBS Digital Studios and the John S. and James L. Knight Foundation. Deep Look is a project of KQED Science, which is also supported by HopeLab, the S. D. Bechtel, Jr. Foundation, the Dirk and Charlene Kabcenell Foundation, the Vadasz Family Foundation, the Gordon and Betty Moore Foundation, the Smart Family Foundation and the members of KQED. #deeplook #seaurchin #urchins
Views: 2416811 Deep Look
When the egg meets sperm
 
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PLEASE, subscribe! I have other exciting videos! A exciting story from sea urchin life. I added the sperm at 27 sec, and at 59 sec the envelope already started to form! Isn't that fantastic? This is the "real close-up" porn - under the microscope! Fertilization of the sea urchins happen externally and the lifecycle is fast and predictable. Оплодотворение яйцеклетки морского ежа. Сперматозоиды добавлены на 27-й секунде. 受精 私は27秒で精子を追加しました
Views: 3438957 The Lucky Urchin
Fertilization in sea urchin | Developmental biology lecture
 
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Fertilization in sea urchin- This developmental biology lecture explains about the fertilization process in sea urchin. It also explains the polyspermy prevention in sea urchin development. For more information, log on to- http://www.shomusbiology.com/ Get Shomu's Biology DVD set here- http://www.shomusbiology.com/dvd-store/ Download the study materials here- http://shomusbiology.com/bio-materials.html Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Please subscribe to our channel so that we can grow together. You can check for any of the following services from Shomu’s Biology- Buy Shomu’s Biology lecture DVD set- www.shomusbiology.com/dvd-store Shomu’s Biology assignment services – www.shomusbiology.com/assignment -help Join Online coaching for CSIR NET exam – www.shomusbiology.com/net-coaching We are social. Find us on different sites here- Our Website – www.shomusbiology.com Facebook page- https://www.facebook.com/ShomusBiology/ Twitter - https://twitter.com/shomusbiology SlideShare- www.slideshare.net/shomusbiology Google plus- https://plus.google.com/113648584982732129198 LinkedIn - https://www.linkedin.com/in/suman-bhattacharjee-2a051661 Youtube- https://www.youtube.com/user/TheFunsuman Thank you for watching
Views: 14372 Shomu's Biology
Sea Urchin Development
 
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Bio 382 Developmental Biology
Views: 2834 Shakiara Ward
Sea urchin fertilization calcium wave
 
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Here, five unfertilized sea urchin eggs have been microinjected with a calcium indicator (and a tiny oil droplet to mark injected eggs). Sperm binding to the egg initiates a signaling cascade that results in the release of calcium from intracellular stores. Calcium release begins at the point of sperm contact and propagates through the cell as a wave. One of the consequences of calcium release is exocytosis of cortical granules and elevation of the fertilization envelope. Eventually, calcium is reabsorbed back into intracellular stores.
Views: 25253 Mariana Leguia
Sea urchin fertilization 2
 
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This video is about animal
Views: 544 Jordan Cox
Sea Urchin Fertilization
 
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Fertilization of eggs of the sea urchin species Strongylocentrotus purpuratus and formation and elevation of the fertilization membrane. Real time. View full screen.
Views: 13829 BioIrvine
Sea urchin fertilization
 
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Fertilization in the sea urchin, Lytechinus pictus. MBL biomedical journalism program, 2011.
Views: 2103 Kate Travis
Spines of a sea urchin (magnified)
 
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This video was taken by fellows at the Marine Biological Laboratory Science Journalism Fellowship. The fellows fertilized sea urchin eggs, and made beautiful videos and photos of cells dividing and growing in the earliest stages of life. See the rest at http://boingboing.net/2012/07/02/the-beginning-of-life.html
Views: 2681 Maggie Koerth-Baker
Do Sea Urchins Hold the Secret to Anti-Aging?
 
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New research published in "Aging Cell," highlights the remarkable regenerative properties of sea urchins
Sea Urchin Poop
 
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A lot of people wonder "what the heck is my sea urchin doing?" The first time that I saw mine doing this strange thing, I thought it was laying eggs. After a bit of research though, I found out it was just pooping. I couldn't find any postings out here of this strange occurrence and caught mine in the process of, well, pooping, so I grabbed my cell phone and took this short video. Sorry for the resolution...It is a cell phone though.
Views: 2204 N2BearsNCubs
sea urchin embryo fertilization and development
 
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Embryos of the purple sea urchin, Strongylocentrotus purpuratus, are shown in an accelerated time-lapse of fertilization and the first 15 hours of development. The stationary cells are eggs that did not fertilize.
Views: 13 Lauren Shipp
Sea Urchin Cleavage
 
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Views: 8402 Kene David Nwosu