1.5 The physics and chemistry of coal formation

Coal is a type of sediment made up mainly of lithified plant remains. But how does spongy, rotting plant debris become a hard seam of coal? As discussed earlier, plant material growing in mires dies, and then rots under anoxic conditions to form peat (by the process of humification). With time, the mire becomes covered with layers of sediment, the weight of which squeezes water and gas out of the pore spaces and compacts the vegetation. As subsidence allows deposition of further mire-s
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28.12.2011 – Langsam gesprochene Nachrichten
Trainieren Sie Ihr Hörverstehen mit authentischen Materialien. Nutzen Sie die Nachrichten der Deutschen Welle von Mittwoch – als Text und als verständlich gesprochene Audio-Datei.Die USA haben Syrien zu einer umfangreichen Zusammenarbeit mit den Beobachtern der Arabischen Liga aufgefordert. Sollte das syrische Regime weiterhin Widerstand gegen die Bemühungen der Liga leisten oder sie ignorieren, dann werde die internationale Gemeinschaft andere Mittel zum Schutz syrischer Zivilisten in Betr
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Steven Telleen
This chapter provides an introduction to human physiology. It is intended to help students understand key concepts that will help them navigate the specific details in later chapters.

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The DNA in our cells is tightly packed into structures called chromosomes. The role of the physical structure of chromosomes in diseases and genetics is being explored thanks to recent advances in technology that allow scientists to look at how the DNA is packaged into chromatin- the structures that form chromosomes. In this lecture Dr Grigoryev will discuss current models of chromosome organisation, several examples of cutting edge research aimed at understanding role of chromatin in cell diffe
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1 Superconductivity

Superconductivity was discovered in 1911 by Heike Kamerlingh Onnes (Figure 1) as he studied the properties of metals at low temperatures. A few years earlier he had become the first person to liquefy helium, which has a boiling point of 4.2 K at atmospheric pressure, and this had opened up a new range of temperature to experimental investigation. On measuring the resistance of a small tube filled with mercury, he was astonished to observe that its resistance fell from ~0.1 Ω at a temper
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9.3 Monoamine oxidase A, maltreatment during childhood and later violence

One Dutch family was found to have a history of antisocial (aggressive) behaviour. Genetic studies were conducted and a potential culprit gene MAOA, monoamine oxidase A, identified. The aggressive individuals in the family appeared to have a mutant gene which produced no MAOAP, an enzyme involved in the breakdown of certain neurotransmitters, including serotonin. A knockout mouse model, in which the MAOA gene was inactive, was also found to be aggressive, apparently confirming the role of MAO
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2.1 The Moon

David A. Rothery Teach Yourself Planets, Chapter 6, pp. 66-75, Hodder Education, 2000, 2003.

Copyright © David Rothery

In this chapter you will learn:

  • about the nearest planetary body to the Earth

  • about the long record of impact cratering on its surface, and about the ancient eruptions that flooded many low-lying areas.

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Ambassador Francisco Campbell Hooker of the Republic of Nicaragua disucsses the African presence in Latin America. Speaker Biography: Francisco Campbell is Nicaraguan Ambassador to the United States.
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Conclusion

This free course provided an introduction to studying the arts and humanities. It took you through a series of exercises designed to develop your approach to study and learning at a distance and helped to improve your confidence as an independent learner.


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Learn About Things That Are Purple
In this video, students will learn about purple things. The name of the object appears on the screen as the picture is shown. Some of the purple pictures include a butterfly, jewel, jigsaw, presents, bow, heart, etc. This is a good resource to introduce or to review colors and color words in the early childhood classroom. (01:44)
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1.9 The rock cycle

As you are reading this, rocks are being formed and destroyed on the Earth. Rocks are being heated and squeezed to form new metamorphic rocks; other rocks are melting to form magmas, which eventually cool and solidify as new igneous rocks; and the processes of weathering, erosion, transport and deposition are generating new sediments. The continuous action of rock-forming processes means that (given time) any rock in the Earth's crust will become transformed into new types of rock and that th
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1 Hibernation and torpor: An introduction

This course examines hibernation, a special form of adaptation that animals can make to the ecological demands of remaining in a chosen habitat in winter. Hibernation is a state which enables energy-efficient survival when ambient temperatures are so low that foraging or simply maintaining normal core body temperature and basal metabolic rate are either energetically too costly or impossible.

Polar endotherms can maintain a high T b even when living actively at sub-zer
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Professor David Lubin gives his first Terra Lecture in American Art on the Shaw Memorial in Boston. David M. Lubin is the Terra Foundation for American Art Visiting Professor 2016-17 at Oxford University, as well as the Charlotte C. Weber Professor of Art at Wake Forest University in Winston-Salem, North Carolina. Professor Lubin is the author of Act of Portrayal (Yale, 1985), Picturing a Nation (Yale, 1994), Titanic (BFI, 1999), and Shooting Kennedy (California, 2003), which was awarded the Smi
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7.344 The Fountain of Life: From Dolly to Customized Embryonic Stem Cells (MIT)
During development, the genetic content of each cell remains, with a few exceptions, identical to that of the zygote. Most differentiated cells therefore retain all of the genetic information necessary to generate an entire organism. It was through pioneering technology of somatic cell nuclear transfer (SCNT) that this concept was experimentally proven. Only 10 years ago the sheep Dolly was the first mammal to be cloned from an adult organism, demonstrating that the differentiated state of a mam
Author(s): Meissner, Alexander

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Content within individual OCW courses is (c) by the individual authors unless otherwise noted. MIT OpenCourseWare materials are licensed by the Massachusetts Institute of Technology under a Creative C

Jonathan Metzl examines how hot-button political issues impact health
Professor Jonathan Metzl isn’t afraid to tackle society’s most controversial issues, like guns, mass shootings, health care, race, politics and mental illness.
Author(s): Amy Wolf

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