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Biology in Motion

Biology in Motion
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Tree of Life Web Project The Tree of Life Web Project (ToL) is a collaborative effort of biologists and nature enthusiasts from around the world. On more than 10,000 World Wide Web pages, the project provides information about biodiversity, the characteristics of different groups of organisms, and their evolutionary history (phylogeny). Each page contains information about a particular group, e.g., salamanders, segmented worms, phlox flowers, tyrannosaurs, euglenids, Heliconius butterflies, club fungi, or the vampire squid. ToL pages are linked one to another hierarchically, in the form of the evolutionary tree of life. Starting with the root of all Life on Earth and moving out along diverging branches to individual species, the structure of the ToL project thus illustrates the genetic connections between all living things.

The Genetic Gamesmanship of a Seven-Sexed Creature | Discoblog What could be better than two types of sexes? For one organism, the answer isn’t three, but seven! And to top it off, these seven sexes aren’t evenly distributed in a population, although researchers have now developed a mathematical model that can accurately estimate the probabilities in this crap-shoot game of sexual determination. Meet Tetrahymena thermophila, which in addition to its seven different sexes—conveniently named I, II, III, IV, V, VI, and VII—has such a complex sex life that it requires an extra nucleus. The other odd thing about this one-celled wonder is that the population of the seven sexes are skewed, leading Unversity of Houston researcher Rebecca Zufall and her colleagues to ask: What gives? To answer that question, they created mathematical models of T. thermophila populations, and discovered that different versions of the same gene, or alleles, gave advantages to different sexes. Related Content: 80beats: What Makes a Boy Lizard? Image: Wikimedia Commons / Ayacop

Preschool science activities How to nurture your child's interest in the natural world © 2008 -2012 Gwen Dewar, Ph.D., all rights reserved Can we design better preschool science activities? In the article below, I review the advice of educational and cognitive psychologists about preschool science education. Floating and Boating is a set of science activities that encourage kids to play in the water, explore the concept of buoyancy, and make some cool contraptions. Dirt Lab is a set of activities that encourages kids to investigate the properties of dirt and mud. Animal tracking offers young children opportunities to exercise their spatial and scientific reasoning skills. Experiments with ice cubes introduce kids to aspects of the scientific method, as does this Brick-making activities allow kids the opportunity to make and test predictions. Activities for encouraging the use of science tools may motivate kids to take measurements and develop fine motor coordination. Preschool science activities: • how living things move

Science Education - Research & Training - NIH NIH Home > Research & Training Resources for Students Featured Site: NIAMS Kids Pages Your childhood and teen years are a prime time to learn habits that will help you keep your bones, joints, muscles, and skin healthy for years to come. Resources for Educators Science Education Partnership Award (SEPA) From science museums to K-12 classrooms, NIH’s SEPA Program supports exciting and innovative educational programs that boost understanding of health and science research among students and the general public. From the NIH Director Francis Collins, M.D., Ph.D., offers a message to high school graduates. - Vijesti - Biologija - Zašto je nekih vrsta na Zemlji mnogo, a nekih malo? Na svijetu postoji više od 400.000 vrsta kornjaša (skupina kukaca), a samo dvije vrste tuatara ili premosnika, rođaka zmija i guštera, koji živi na sjeveru Novog Zelanda. Zašto evolucija stvara ''pobjednike',' kao što su sisavci i mnoge vrste ptica i riba, a zašto ''gubitnike'' i dalje je jedno od središnjih pitanja evolucijske biologije. Premosnici (Sphenodon) su jedini recentni rod reda Rhynchocephalia u razredu gmazova. Pored toga, jedini su recentni predstavnici porodice Sphenodontidae. Često ih se naziva i "živim fosilima", jer se njihovo postojanje može slijediti fosilnim nalazima unatrag sve do razdoblja trijasa, u vrijeme prije oko 200 milijuna godina. Obitelj premosnika predstavljaju samo dvije vrste, Sphenodon punctatus (naslovna fotografija) i, još rjeđa, Sphenodon guntheri. Znanstvenici su pretpostavljali da je vrijeme glavni čimbenik koji utječe na broj vrsta - što su neke životinjske i biljne linije starije od ostalih, iz njih se mnogo više vrsta imalo vremena razviti.

Environmental Science - AP Environmental Science - Homework Help Can I take a course at HippoCampus for credit? How do I enroll in a course at HippoCampus? Are there any fees to take your courses? How do I make a comment or ask a question? How do I get individual help with my homework assignment? What are the preferred texts? How can I use HippoCampus in my classroom? How can I use HippoCampus in my home school? Can I use the resources you have available for my homeschoolers? Do you know of any wet lab resources to accompany HippoCampus content? Is there a script, app, or something that can be used to track student use of HippoCampus? Can I share my HippoCampus content with my fellow teachers? Can I download the video? Can I change the size of the video window? Why won't the Environmental Science animations play? What if my page scroll bars or "submit" button are not showing? I can't find closed captioning. Where does the content from your site come from? There is an error in the multimedia presentation. How do I report a course errata item? No. AP Course Ledger

Teach.Genetics™ Rare and Precious Moments of Animal Life How interesting can animal life be is something which we can only guess. By looking these amazing photographs it seems that they have very funny and precious moments. Would you like to be monkey, or elephant, or maybe cat sometimes? Don’t worry if you do because this has happened all of us at least ones, for now enjoy these rare photos! Human Body Maps | 3D Models of the Human Anatomy Different organs can work together to perform a common function, like how the parts of your digestive system break down food. We refer to an integrated unit as an organ system. Groups of organ systems work together to make complete, functional organisms, like us! There are 11 major organ systems in the human body. The circulatory system is a body-wide network of blood, blood vessels, and lymph. Powered by the heart, it is the body’s distribution system to organs with oxygen, hormones and essential nutrients that helps it function properly. Learn more about these body parts in the circulatory system: Every tissue within the body requires oxygen to function. Learn more about these body parts in the respiratory system: The skeletal system gives the body its basic framework, providing structure, protection, and movement. The nervous system allows us to perceive, comprehend, and respond to the world around us. Learn more about these body parts in the nervous system:

Don Slish Animations {*style:<b>Animations and Interactive Tutorials Produced by Dr. Donald F. Slish </b>*} This animation shows the molecular mechanisms of the control of cell division by tyrosine kinases and the inhibition of this by p53, when there is slight DNA damage. Other animations: RER protein folding Hypoxic effects on dopamine release Metabotropic Receptor activating an ion channel Ionotropic Receptor Receptor Regulation (Extended) Receptor Regulation (Short form) Amphetamines, Ecstasy, Cocaine, and LSD mechanisms Insulin Receptor Mechanism Phosphatidylinositol Kinase and actin polymerization Toxin of the Neuromuscular Junction Summation (threshold) Summation Cell Crawling - retrograde flow of actin Cell Crawling APC control of Metaphase - Anaphase transition TNF activation of Apoptosis Cargo Vesicle moving on a Microtubule Vesicle I Astral molecular motor Astral II Molecular motors used in mitosis Molecular Motors A basic electrical circuit