ΟΟΣΑ: Εκπαιδευτική έρευνα PISA H Κύπρος θα συμμετάσχει στην έρευνα PISA 2012. Το συντονισμό και τη διεξαγωγή της έρευνας έχει αναλάβει το ΚΕΕΑ. Η PISA είναι μία διεθνής έρευνα που διεξάγεται από τον OECD (Organisation for Economic Cooperation and Development – Οργανισμός Οικονομικής Συνεργασίας και Ανάπτυξης) με σκοπό τη διεθνή αξιολόγηση των εκπαιδευτικών συστημάτων των χωρών που συμμετέχουν σε αυτόν. Συγκεκριμένα, η έρευνα στοχεύει στον καθορισμό αξιόπιστων δεικτών σε θέματα που σχετίζονται με τα μαθησιακά αποτελέσματα των εκπαιδευτικών συστημάτων (γνώσεις και δεξιότητες στους τομείς της Ανάγνωσης, των Μαθηματικών και των Φυσικών Επιστημών) κατά την περίοδο στην οποία η υποχρεωτική εκπαίδευση βαίνει ή βρίσκεται προς την ολοκλήρωσή της (στις περισσότερες χώρες). Η έρευνα διεξάγεται από το 2000 κάθε 3 χρόνια. Μετά από επίμονες προσπάθειες η Κύπρος θα μπορέσει να συμμετάσχει στην έρευνα PISA 2012. Η Πιλοτική Φάση (Field Trial) της έρευνας στην Κύπρο θα πραγματοποιηθεί το Μάρτιο και Απρίλιο του 2011. Κώστας Συμεωνίδης
Home of CELLS alive! DNA Structure - Contents page An Interactive Animated Nonlinear Tutorial by Eric MartzAdapted for using Jmol instead of Chime, by Angel Herráez Part of Biomodel website by Angel Herráez, Univ. de Alcalá (Spain) Disponible también en español. Também disponível em português. Auch verfügbar auf Deutsch. Disponible aussi en français. This version 4.3 works in any Java-compatible browser. If you prefer using Chime for molecular models, the page using it is still available, with equivalent content and functionality. This tutorial is designed to complement Biology or Biochemistry and Molecular Biology books, so it is not by itself a complete introduction to DNA structure. Before proceeding, check that your browser has Java installed and can use the Jmol software: This tutorial is designed to complement an introduction to DNA, by providing tools for a self-directed exploration. Methods, Acknowledgements, and References. Do you know there are more tutorials at MolviZ.Org? More about Jmol: Jmol home page. Version history
vamnies on Vodpod - Videos about Or join with email Or Join with Email By joining, you agree to our Terms of Use and Privacy Policy. Or Sign in with email Forgot your password? Forgot your password Enter your email address and we'll send you an email with a link to reset your password. Sign in vamnies (vodpod) Top Collection vamnies's videos DNA From The Beginning Cellular Aging: Telomeres - Telomeres Are Chromosome Caps, Telomere Structure, Telomeres And Replication, Telomeres And Replicative Senescence, Telomeres And Premature Aging Syndromes Aging is a complex process that occurs on multiple levels. The end result of aging is that life span is limited in multicellular organisms. The cells that make up multicellular organisms also have limited life spans. In the 1960s, Leonard Hayflick first noted that human cells undergo a limited number of divisions when placed in culture.
The PCR Method - a DNA Copying Machine Lists of Nobel Prizes and Laureates The PCR Method - a DNA Copying Machine Play the Eye of the Donkey Game About the game PCR is a method by which a few fragments of DNA can be duplicated into millions in a couple of hours. The Nobel Prize The 1993 Nobel Prize in Chemistry was awarded for the invention of PCR, a method that made it possible to copy a large numbers of DNA fragments in only a few hours. Share this: Share on facebook Share on google_plusone_share Share on twitter More Sharing Services Share on email To cite this pageMLA style: "The PCR Method - a DNA Copying Machine". Recommended: The Legacy of Alfred Nobel On 27 November 1895 Alfred Nobel signed his last will in Paris. Play the Blood Typing Game Try to save some patients and learn about human blood types! Unlocking the Secrets of Our Cells Discover the 2012 awarded research on stem cells and cell signalling. Contact E-mail us Press Sitemap A-Z Index Frequently Asked Questions Terms Follow Contact | Press | Sitemap | FAQ | Terms Follow us:
Biology Animations Carnegie Mellon's Office of Technology for Education and Department of Biological Sciences create multimedia materials for teaching and learning Biology. After an analysis of a number of Biology courses was performed to identify when and how shared concepts where taught, a team of biologists, media programmers, and learning experts came together to create animations designed to improve understanding of some of the main concepts taught in Modern Biology and Biochemistry. Phosopholipid Membranes Tutorial page describing the construction and properties of Biological Membranes. Biological Membranes Biological membranes are dynamic structures composed of a diverse set of phospholipid molecules and proteins. Phase Transition This tutorial explains how phospholipids bilayers undergo to a cooperative phase transition or melting that is similar to protein denaturation. back to index Signal Transdaction Serine Protease Uniport - Glucose Transport Symport - Lactose Permease Transporter ATP Synthesis
Junk DNA - Junk DNA & Evolution The most interesting genetic homologies are in junk DNA. Often called "noncoding DNA," junk DNA has no apparent function or produce no protein but may help regulate the gene. When DNA is transcribed, pieces either do not get transcribed at all or are only partially transcribed, with no functional protein produced. You can cut out or modify most junk DNA without affecting the organism. There are several varieties of junk DNA including pseudogenes, introns, transposons and retroposons. Is Junk DNA Useless? Stretches of non-coding DNA were originally labelled "Junk DNA" on the assumption that non-coding sequences did nothing at all. The function of over 95 percent of our DNA is still a mystery. Bryan D. Because they appear functionless but take up valuable chromosomal space, these noncoding sequences have been considered useless and have been termed junk DNA or selfish DNA. Importance of Junk DNA Why is junk DNA so interesting? The same can be said of DNA. Junk DNA Homologies
Nuclear reactor and power plant simulation Introduction This is not a lesson like the others in Radioactivity and Atomic Physics Explained but it fits in well with the lesson on nuclear power. It is a very sophisticated simulation of a pressurised water reactor (PWR), which is the most common type of nuclear power reactor in the US but not in Europe, though the principles are very similar. Using the tour There is a comprehensive tour which goes through the workings of the reactor, starting from a consumer of electrical energy and working backwards to the reactor core itself. You can restart the tour at any time using the button at the top left of the screen. Hint numbers Each part of the simulation has a hint number that you can click to see a description of its function. The skill test Once you're familiar with how to use the reactor you can see whether you can control the reactor so that the power output matches the demand from the city. Back to Summary of Radioactivity and Atomic Physics Explained
Aging What is Aging? Aging is the progressive loss of physiological functions that increases the probability of death. This table gives some data. The decline in function certainly occurs within cells. In the natural world, very few animals live long enough to show signs of aging. Random mortality from starvation predation infectious disease a harsh environment (e.g., cold) kills off most animals long before they begin to show signs of aging. Even for humans, aging has only become common in recent decades. At the start of the 20th century, infectious diseases such as pneumonia and influenza caused more deaths in the United States than "organic" diseases like cancer. In 1900, a newborn child in the U.S. could look forward to an average life expectancy of only 47 years. Three-quarters of a century later, life expectancy had risen to 73 years and "organic" diseases, including all the diseases of aging, had replaced infectious diseases as the major cause of death. Aging in Invertebrates Why Do We Age?