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User: FreeScienceLectures

HIV Replication and Life Cycle http://www.FreeScienceLectures.com HIV replication is a complex multi-staged process that includes crucial steps taking place on the exterior as well as the interior of the target host cell. The first three steps involved in cell entry are termed attachment, co-receptor binding and fusion. Each step is crucial to successful viral reproduction. Once HIV virus penetrates the cell, it releases its RNA into the cell. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: nrti nnrti virodna protease inhibitor hiv replication cell host attachment binding fusion

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Neutrophil Chemotaxis http://www.FreeScienceLectures.com Human neutrophils are mobile cells that will quickly migrate to sites of injury to help fight infection. They are attracted there by chemical signals released by other cells of the immune system or by invading microbes. In this experiment substance is released from micropipette that makes the neutrophils polarize and move towards that location. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: human blood neutrohpil chemataxis cell bacteria microbes chemical signal micropipette polarization experiment

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DNA Replication Process http://www.FreeScienceLectures.com We travel inside nucleus to see how the DNA replicates. When DNA replicates its strands are separated by enzine helicase. Single-stranded DNA binding proteines keep the strands from (...?). One DNA strand encodes the leading strand using DNA Polymerase III. Just watch to see what is going on. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: dna replication enzine helicase strand polymerase encode okazaki fragments rna primase primer ligase

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Rats Laugh When You Tickle Them http://www.FreeScienceLectures.com Scientists listened to animals playing and they noticed something that appeared to them to be laughter. They studied this behavior for couple of years before acturally realizing that it is laughter. Soon they got a device which transformed higher frequency sounds to frequencies our auditory system can hear. So they developed a way to ask these rats if they liked being tickled and the answer was definite yes! --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: rat rats scientist laugh laughter laughing sound frequency tickle tickling

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A Video of Molecules http://www.FreeScienceLectures.com This video shows how various molecules look. For example, water consisting of two hydrogen atoms and one oxygen atom. The others are: glucose, sucrose, amylose, stearic acid, oleic, glycerol, trigglyceride, phospholipid, alenine, serine, leucine, phenyaleine, hexapeptide, peroxide, dioxiribose, thymine, atp, dna, amylpectin and cellulose. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: molecules atoms hydrogen oxygen glucose sucrose amylose stearic acid oleic glycerol trigglyceride phospholipid alenine serine leucine phenyaleine hexapeptide peroxide dioxiribose thymine atp dna amylpectin cellulose

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Sodium Reacts with Four Acids http://www.FreeScienceLectures.com Here is an experiment where sodium reacts with four different acids - 6M HCl, 12M HCl, 6M HNO3 and 15M HNO3. The reaction with 15M HNO3 is the fastest and 12M HCl is the slowest reaction and it still hasn't all reacted even after 75 seconds --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: sodium reaction HCl HNO3 acid fast slow experiment hydrochloric nitric

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Formation of Aluminum Bromide http://www.FreeScienceLectures.com In this experiment we are going to react aluminium with liquid bromine to make aluminum-bromide. First a layer of bromine is poured into the bottom of a beaker. Then some aluminium powder is placed on to of bromine. Within a few moments they begin to react exothermically. Eventually all the aluminum has reacted. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: aluminum aluminium bromine bromide liquid reaction exothermic powder beaker fume coating

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Exothermic Iron-Oxide and Aluminum Reaction http://www.FreeScienceLectures.com A metal crucible is filled with iron-oxide and aluminum. A small amount of potassium, sugar and chloride is placed on top of iron-oxide aluminum mixture. A few drops of concentrated sulphuric acide is added to the mixture to start the reaction. The reaction extremely exothermic. The crucible becomes red hot. The aluminum has reduced the iron-oxide to iron. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: iron oxide aluminum potassium chloride sulphuric acid exothermic reaction mixture reduction

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Rotation, Seasons and Surface of Planet Mars http://www.FreeScienceLectures.com Mars is the fourth planet from the Sun in the Solar System. The planet is named after Mars, the Roman god of war. It is also referred to as the "Red Planet" because of its reddish appearance as seen from Earth. A terrestrial planet, Mars has a thin atmosphere and surface features reminiscent both of the impact craters of the Moon and the volcanoes, valleys, deserts and polar ice caps of Earth. It is the site of Olympus Mons, the highest known mountain in the solar system, and of Valles Marineris, the largest canyon. In addition to its geographical features, Mars' rotational period and seasonal cycles are likewise similar to those of the Earth. This video shows the rotation speed of the red planet Mars relative to Earth, the seasonal cycles on Mars and its surface structure. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: red planet earth mars rotation surface seasons map free science lectures videos

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Dr. Quantum Visits Flatland http://www.FreeScienceLectures.com Dr. Quantum welcomes you to flat-land, the world of only two dimensions! In this world there is only forwards, backwards and left and right. There is no up and no down! In this world two dimensional creatures have no concept of three dimensional objects. There flatlanders have no understanding of cubes, spheres, tetrahedrons... From their 2D perspective, Dr. Quantums 3D finger looks like a filled ellipse. Fear of the unknown? If we see only what we know, how does anyone every see anything new - the unknown? How do we ever get out of our box? Dr. Quantum explains how he sees things from a different perspective than the two dimensional creatures. Finally Dr Quantum takes the 2D creature and brings her to 3D space. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: dr quantum flat land 2d two dimensions 3d three dimension up down back forward creature unknown cube sphere tetrahedron ellipse space

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Mars Science Laboratory http://www.FreeScienceLectures.com Building on the success of the two rover geologists that arrived at Mars in January, 2004, NASA's next rover mission is being planned for travel to Mars before the end of the decade. Twice as long and three times as heavy as the Mars Exploration Rovers Spirit and Opportunity, the Mars Science Laboratory will collect Martian soil and rock samples and analyze them for organic compounds and environmental conditions that could have supported microbial life now or in the past. The mission is anticipated to have a truly international flavor, with a neutron-based hydrogen detector for locating water provided by the Russian Federal Space Agency, a meteorological package provided by the Spanish Ministry of Education and Science, and a spectrometer provided by the Canadian Space Agency. Mars Science Laboratory is intended to be the first planetary mission to use precision landing techniques, steering itself toward the Martian surface similar to the way the space shuttle controls its entry through the Earth's upper atmosphere. In this way, the spacecraft will fly to a desired location above the surface of Mars before deploying its parachute for the final landing. As currently envisioned, in the final minutes before touchdown, the spacecraft will activate its parachute and retro rockets before lowering the rover package to the surface on a tether (similar to the way a skycrane helicopter moves a large object). This landing method will enable the rover to land in an area 20 to 40 kilometers (12 to 24 miles) long, about the size of a small crater or wide canyon and three to five times smaller than previous landing zones on Mars. Like the twin rovers now on the surface of Mars, Mars Science Laboratory will have six wheels and cameras mounted on a mast. Unlike the twin rovers, it will carry a laser for vaporizing a thin layer from the surface of a rock and analyzing the elemental composition of the underlying materials. It will be able to collect rock and soil samples and distribute them to on-board test chambers for chemical analysis. Its design includes a suite of scientific instruments for identifying organic compounds such as proteins, amino acids, and other acids and bases that attach themselves to carbon backbones and are essential to life as we know it. It can also identify features such as atmospheric gases that may be associated with biological activity. Using these tools, Mars Science Laboratory will examine Martian rocks and soils in greater detail than ever before to determine the geologic processes that formed them; study the martian atmosphere; and determine the distribution and circulation of water and carbon dioxide, whether frozen, liquid, or gaseous. NASA plans to select a landing site on the basis of highly detailed images sent to Earth by the Mars Reconnaissance Orbiter, in addition to data from earlier missions. The rover will carry a radioisotope power system that generates electricity from the heat of plutonium's radioactive decay. This power source gives the mission an operating lifespan on Mars' surface of a full martian year (687 Earth days) or more while also providing significantly greater mobility and operational flexibility, enhanced science payload capability, and exploration of a much larger range of latitudes and altitudes than was possible on previous missions to Mars. Planned Launch: Fall, 2009 Arrival: October, 2010 --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: mars planet labaratory labarotory rover parachute orbit landing exploration msl nasa

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Resonance Phenomena in 2D on a Plane http://www.FreeScienceLectures.com The plane is vibrated at some specific frequency. The waves travel across the plane and at some places they add together and at other places they cancel out. Where they cancel out the salt stucks because there is no vibrations and at other places it just gets vibrated away. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: resonance plane salt node antinode interference destructive constructive

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The Search for Extraterrestrial Intelligence by Carl Sagan http://www.FreeScienceLectures.com To reach other intelligences our technology must reach beyond interplanetary distances it has to go interstellar distances. The largest radio radar telescope on the planet Earth - Arecibo radio telescope - is located in Arecibo, Puerto Rico. It is so powerful it could communicate with an identical one 15 thousand light years away. Half-way to center of Milky Way galaxy. It was used to send a message to a star cluster M15. But is there anyone out there to talk to? How far away is the nearest civilization capable of communicating with a radio telescope? If the galaxies are distributed randomly, the nearest one should be 200 light years away. How would we know we are receiving a message from intelligent life form? Transmitting civilization could make it very easy for us if they wished. If one day we found a signal which was methodical series of pulses then we would conclude that someone is saying hello. For example the signal could be all the prime numbers 2, 3, 5, 7, 11, 13, 17, ... which no natural source of radiation could transmit. Our technology is now fully adequate for this challenge. Why havent we yet discovered any and why hasn't they visited us? One answer is that maybe we are first? Some civilization has to be first. Or maybe they have destroyed themselved. Or possibly they are already with us, just hiding. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: carl sagan life intelligence civilization radio telescope milky way stars galaxies extraterrestrial arecibo puerto rico m15 signal prime numbers

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Carl Sagan Explains the Drake Equation http://www.FreeScienceLectures.com The most famous American astronomer and astrophysicist Carl Sagan explains the Drake equation. The Drake equation (rarely also called the Green Bank equation or the Sagan equation) is a famous result in the speculative fields of xenobiology, astrosociobiology and the search for extraterrestrial intelligence. The Drake equation states that: N = R* × fp × ne × fl × fi × fc × L, where: N is the number of civilizations in our galaxy, with which we might hope to be able to communicate; R* is the rate of star formation in our galaxy fp is the fraction of those stars that have planets ne is the average number of planets that can potentially support life per star that has planets fl is the fraction of the above that actually go on to develop life at some point fi is the fraction of the above that actually go on to develop intelligent life fc is the fraction of civilizations that develop a technology that releases detectable signs of their existence into space L is the length of time such civilizations release detectable signals into space. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: carl sagan drake equation life extraterrestrial intelligence planets stars

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Carl Sagan on Planet Venus http://www.FreeScienceLectures.com Sagan was central to the discovery of the high surface temperatures of the planet Venus. In the early 1960s, no one knew for certain the basic conditions of Venus' surface and Sagan listed the possibilities in a report later depicted for popularization in a Time-Life book, Planets - his own view was that the planet was dry and very hot, as opposed to the balmy paradise others had imagined. He had investigated radio emissions from Venus and concluded that there was a surface temperature of 500 °C (900 °F). As a visiting scientist to NASA's Jet Propulsion Laboratory, he contributed to the first Mariner missions to Venus, working on the design and management of the project. Mariner 2 confirmed his views on the conditions of Venus in 1962. This video shows an interview with him before the first missions to Venus in 1960 or 1961. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: carl sagan venus planet nasa 1960

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Transparent Cement http://www.FreeScienceLectures.com Here is a demo of transparent cement. It's almost as tough as the usual one but it also lets through light. It could be used for designing modern buildings or used in facilities which need some of solar light to pass through. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: cement transparent demo

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Multi-Input Touch Screen Interaction Technology http://www.FreeScienceLectures.com The usual touch screens usually allow just a single touch interaction. This new technology is designed to be usable by both hands or by multiple persons. The uses are endless. You can use it for creating a fantastic video mixing or special effects. Create interactive presentations which can be modified with both hands. Quickly categorize, resize and move images. Draw some pokemons and make them wiggle. Examine 3D figures more easily. Maps and terrains can be examined. Music can be mixed. And it can be used to display some complex mathematical structures as graphs for example. Sure there are many other uses. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: touch screen touchscreen multi input hands video mixing presentation images pictures figures pokemon map terrain graphs

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Atmosphere Cloud Wave http://www.FreeScienceLectures.com An atmospheric cloud wave is a stable structure moving through the clouds. --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: atmosphere clouds wave rain weather

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The First Moon Landing in 1969 http://www.FreeScienceLectures.com The video of the very first moon landing of the Apollo 11 mission in 1969! Neil Armstrong was the first man to set foot on the moon with his now legenday words "One small step for man, a giant leap for mankind." --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: moon landing nasa spacecraft neil armstrong houston flag buzz aldrin

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2.2 MegaVolt Lightning - Lichtenberg Figures http://www.FreeScienceLectures.com The interior of an 18" square x 1" piece of Plexiglas was charged to 2.2 million volts (MV) using a 5 MV particle accelerator. A layer of excess electrons become trapped deep inside. When discharged, the excess charge escaped with a bright flash and a loud bang. The hot, lightning-like discharge created thousands of microscopic fractures inside the acrylic, resulting in a branching "Captured Lightning" sculpture (or Lichtenberg Figure). This video was done by Bert Hickman from Stoneridge Engineering. His website: http://www.teslamania.com --- It's Never too Late to Study: http://www.FreeScienceLectures.com --- Notice: This video is copyright by its respectful owners. The website address on the video does not mean anything. --- Tags: lightning plexiglas lichtenberg figure sculpture electrons charge potential voltage flash

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