Summary 1 The visible matter in the Universe, stars and interstellar gas, is concentrated into galaxies, which are collections of ~1011 stars. The galaxies themselves are usually to be found in clusters with typically tens or hundreds of members. The clusters, in their turn, are loosely associated in superclusters. 2 Distances are estimated via a series of intercalibrated techniques, each overlapping with and extending further than the previous one. The principal stages are:
7.4 Nuclear abundances as evidence for the big bang What we have seen is that a theoretical model based on the assumption that there was a big bang, and incorporating an assumption about the present-day value of the baryonic density, ρb,now, leads to definite predictions as to what the nuclear abundances must have been when the elements froze-out. This, therefore, provides us with a third way of checking out the big bang hypothesis: Do the present-day cosmic nuclear abundances agree with these predictions for any plausible v
7.1 Introduction So far we have presented two pieces of evidence pointing to the occurrence of a big bang: the redshift of the galaxies (indicating the continuing expansion of the Universe), and the 3 K radiation (the remnant of the primordial radiation). But there is a third imprint such a big bang ought to have left on our present-day world. We cannot at this juncture trace out the full sequence of events following the instant of the big bang (that can only be done after we have worked through the next two
3.5 Line graphs To illustrate how to create and use line graphs, we will use the example of a calibration curve.
A calibration curve is a type of line graph in which the response of a measuring device to a series of known concentrations of a substance is plotted. You can then make a measurement of an unknown sample – in the case we're about to examine, blood serum samples from new-born infants – and use the calibration curve to work out what concentration of substance is present. 5.1 Introduction The change in BMR observed in all hibernators has traditionally been viewed as a passive response that is a consequence of hypothermia. However, many studies have provided evidence for temperature-independent regulation of BMR. In the alpine marmot (Marmota marmota), a BMR that is less than 5% of summer levels is maintained despite the frequent fluctuations in body temperature between 8 and 18° C. The mechanism of body temperature regulation in marmots, during long periods of hiberna 1 1.2 How DNA is replicated Cell division involving the nuclear division of mitosis produces two progeny cells, which contain identical genetic material, which is also identical with that of the original parent cell. This is how a fertilized egg grows into an adult many-celled organism. For one cell to become two new ones with identical genetic material, the DNA in each chromosome must undergo a process in which an identical copy is made. As noted above, Watson and Crick postulated that DNA base-pairing provides a Acknowledgements The content acknowledged below is Proprietary (see terms and conditions) and is used under licence. Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit: Chase Crowson flickr.com (18 October 2007) All other materials included in this unit are derived from content originated at the Open University. Introduction In this , we describe the theory of evolution by natural selection as proposed by Charles Darwin in his book, first published in 1859, On The Origin of Species by Means of Natural Selection, or The Preservation of Favoured Races in the Struggle for Life. We will look at natural selection as Darwin did, taking inheritance for granted, but ignoring the mechanisms underlying it. Lunchtime at Google with Jacques Pépin ISS Update: Nutrition Manager Talks About Children's Book "Space Nutrition" Grand Rapids Men and Boy's Choir | 12/15/12 Self/non-self discrimination, from the molecular to the cellular level (part 2) Brave Irene How Does Work...Work? Music Visualization using Independent Component Analysis Meer en betere digitale ondersteuning voor kennisdeling in ons onderwijs: Persmededeling KlasCement maakt vanaf nu deel uit van het Agentschap voor Onderwijscommunicatie (onderdeel van het Ministerie van Onderwijs en Vorming). De gesprekken met de vzw eduCentrum en de beslissing van de Vlaamse regering resulteerden eind … Androidology - Part 3 of 3 - APIs Part 3 of 3 in an overview series on the Android platform. In this segment, Mike gives an overview of a few of the APIs available on the platform. Breakingviews: Penguin M&A: creativity on ice? 15.031J Energy Decisions, Markets, and Policies (MIT) Resource #10298
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Chef Jacques Pépin joins Anjali Kumar for Lunchtime at Google. This event took place on November 15, 2012, as part of the Lunchtime at Google series.
NASA Public Affairs Officer Brandi Dean interviews Scott Smith, Manager of Nutritional Biochemistry at Johnson Space Center, about the children's book he co-authored called "Space Nutrition." The book talks about the history of spaceflight, the various space programs and of course space food.
Smith talks about how the project developed from a newsletter with illustrations to a children's book. In the book he introduces the "scientific method" and highlights current space experiments and various
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By: icamvid Self/non-self discrimination, from the molecular to the cellular level (part 2) by Grégoire Altan-Bonnet - MSKCC (New York)
Cargese 2012 - Emergent Order in Biology (12-3)
July 23, 2012 – August 03, 2012
Location: Cargese, Corsica, France
Listen to Al Gore read Brave Irene by William Steig. The original illustrations are shown. Plucky Irene, a dressmaker's daughter, braves a fierce snowstorm to deliver a new gown to the duchess in time for the ball. (14:03)
The concepts of work and power help us unlock and understand many of the physical laws that govern our universe. In this Lesson, Peter Bohacek explores the interplay of each concept when applied to two common objects---a lightbulb and a grandfather clock. (04:30)
Rene Castro
Elec 301 Project on Music Visualization Using Independent Component Analysis
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Dec. 27 - Big media M&A deals like the Penguin-Random House merger are a welcome reshape for an industry hit by the digital revolution, but they also risk creativity, says Reuters Breakingviews.
This course examines the choices and constraints regarding sources and uses of energy by households, firms, and governments through a number of frameworks to describe and explain behavior at various levels of aggregation. Examples include a wide range of countries, scope, settings, and analytical approaches. This course is one of many OCW Energy Courses, and it is a core subject in MIT's undergraduate Energy Studies Minor. This Institute-wide program complements the deep expertise obtained in an
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