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Babbage: Insectageddon?

The insect apocalypse may not be imminent, but the decline of insect species is still a concern. And we speak to Dr Angela Gallop about her career as one of Britain’s most eminent forensic scientists. Also, when will a robot barista serve you a latte? Kenneth Cukier hosts


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Lessons from Google CEO Sundar Pichai’s Congressional Testimony
Congress recently grilled Google CEO Sundar Pichai on privacy issues, political bias and possible plans to introduce a censored search engine in China. Experts from Wharton and elsewhere weigh in on his testimony.
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2.4 Analysis of nucleic acids by electrophoresis and hybridisation

Nucleic acids can be separated according to size by gel electrophoresis, most commonly performed using a horizontal gel (Figure 7a). This is in contrast to the vertical gel electrophoresis set-up, which is generally used for analysis of proteins.

The size of DNA molecules is usually expressed in terms of the number of
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1.1 Introduction to vitamins and why we need them

Before the 19th century, one of the hazards of long sea voyages was a condition called scurvy, whose symptoms were loss of hair and teeth, bleeding gums, very slow healing of wounds, and eventually death. Hundreds of sailors and explorers died from scurvy until a Scottish physician, James Lind, in the 1750s discovered that adding a daily portion of citrus fruit to the rations of those at sea could prevent the condition, whereas adding cider, vinegar or various other substances that he tested,
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Conclusion

In this course you have found out that:

  • The sensation of pain is caused by the release of a chemical (prostaglandin) that stimulates the nerve endings and sends an electrical message to the brain.

  • Pain can be reduced if the formation of prostaglandin can be inhibited.

  • Prostaglandin is formed, from arachidonic acid, in a cavity in the active site of the enzyme cyclooxygenase (COX).

  • Geometrical isomerism can b
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1.7.1 Enzymes: nature's catalysts

It will probably come as no surprise to you that chemical reactions, including the conversion of arachidonic acid into prostaglandin, do not occur instantaneously and the rate at which they take place can be very variable. Some reactions are over in a flash, such as the burning of gunpowder, and others take months, such as rust formation on a car. All chemical reactions can be speeded up by increasing the temperature of the reactants. In the laboratory one often ‘cooks’ reaction mixtures
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War, Intervention and Development
How can we prevent a country from returning to civil war? When and how should external parties intervene in serious conflicts? This album looks at the decade of violence and destruction that occurred in Sierra Leone in the 1990's. Now that peace has finally come about through the efforts of the international community, it's time to debate whether the root causes of war have been adequately addressed, and what lessons can be learned. 50% of Sierra Leoneans are under 15 and unskilled. Lack of edu
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Appendix 2 Acronyms

APCangle-polished convex (connector)
ASEamplified spontaneous emission
ASKamplitude shift keying
cwcontinuous wave
DSFdispersion-shifted fibre
DWDMdense wavelength division multiplexing
EDFAerbium-doped fibr
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5.13.1 Rectangular bar

If a solid rectangular bar is excited by striking it, energy is supplied that starts the bar vibrating transversely. The bar will vibrate in a number of modes simultaneously since the striking action supplies energy over a range of frequencies. The motion of the bar will be the superposition of the standing-wave patterns of the excited modes.

Assume for the moment that the rectangular bar is supported in such a way that both ends are free to vibrate and the effects of the supports can b
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5.2 Vibrating string: speed of wave propagation

If standing waves are set up when two travelling waves moving in opposite directions interact, then how are standing waves set up on a string and why are they set up only at certain frequencies?

To help answer these questions, I want you first to imagine a length of string that is fixed at one end and held in someone's hand at the other. Suppose the person holding the string flicks their end of the string in such a way that an upward pulse is sent along the string.

As the pulse pa
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5.1 Standing waves

You learned earlier that when a musician plays a note on an instrument, they supply it with energy that causes the primary vibrator to oscillate at certain specific frequencies. In Section 5 we are going to look at what determines these specific frequencies for some of the primary vibrators found in different instruments.

In Unit TA212_1 Sound for music technology: an introduction, we talk about travelling waves: that is, waves that propagate outwards away from their sourc
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4 Excitation

For a player to be able to sound a musical instrument, there must be a means of inputting energy to set up the vibration. This energy may be introduced in a short, sharp burst or continuously over a period of time.

In the case of brass instruments such as the trumpet and trombone, and woodwind instruments such as the flute and oboe, the player feeds in energy by blowing air into the instrument. The energy can be supplied in a short burst – in which case short-lived ‘staccato’ note
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3.3.1 Sequence of events

It was important to establish the precise sequence of events leading up to and during the collapse. From which part had the collapse started? Why had so much of the structure been destroyed? Was there any prior warning of the failure? What part had the weather conditions at the time played?

Eyewitnesses were plentiful, and each had a different perspective of the bridge as it fell. There were some common parts to their statements. Most of the witnesses, especially survivors from vehicles
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The Graeco-Roman city of Paestum
What can archaeological remains tell us about early cities and the people who lived in them? This album examines the important remains of one city, Poseidonia in Italy, founded towards the end of the 7th century BCE by colonists from the Greek city of Sybaris. Although only twenty-five per cent of the site has been excavated to date, much of its history and culture can be traced through its buildings, inscriptions, and decoration. After it became a colony of Rome in 273 BCE, it became known a
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Facilitating group discussions
Gain an insight into facilitating meetings and discussions in the workplace. In this free course, Facilitating group discussions, you will look at some of the behaviours effective facilitators exhibit. Informative and engaging videos will introduce you to examples of facilitation in practice. First published on Mon, 29 Feb 2016 as Author(s): Creator not set

The closure meeting

The final meeting is a time for celebrating successful completion. It could have a similar format to the launch meeting, and involve many of the same people. It might include:

  • reviewing the outputs or outcomes;

  • confirming the arrangements for any follow-up work;

  • thanking the team, the sponsor(s) and the stakeholders for their support;

  • presenting the completion report for approval and sign-off.

<
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Critical social work practice
This series of tracks looks at social work practice around the world and compares attitudes and management techniques within the social work field. Material is taken from The Open University Course K315 Critical social work practice. The OpenLearn team.
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Conclusion

This free course provided an introduction to studying Computing and ICT. 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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What children and young people say
This free course, What children and young people say, looks at how practitioners and other adults talk to children and young people, and considers how this influences what they tell us. It identifies how children and young people would prefer to be engaged with, what would encourage their confidence in authority figures, and outlines the ways in which adults can improve on their listening techniques.Author(s): Creator not set

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Issues in research with children and young people
This free course, Issues in research with children and young people, considers the aims and range of research with children and young people. Students consider how their own views and understandings about childhood and youth have arisen. Different definitions of research are explored through first-hand accounts by researchers across a range of disciplines and studies, from the small-scale to international studies studying children's lives across several countries. Attention is drawn to the role
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