271 search results
Working with our environment: an introduction
Nature & Environment

Working with our environment: an introduction

...circulate a cooling liquid or refrigerant which extracts heat from the cold space and carries it to the outside, where it is released, usually through a radiator at the back. Most refrigerators make use of the principle that when liquids vaporise – that is, change from liquid to gas – they take heat from their surroundings; when the gases condense back to liquid they...
View course Working with our environment: an introduction
Level 1: Introductory 11 hrs
Introduction to ecosystems
Science, Maths & Technology

Introduction to ecosystems

...respired out, so the carbon that's been fixed then leaves the plant, the remaining 50% goes into building the plant tissues. That can be leaves and stems. But also into leaving a little extra for a bad day, winter time. There'll be some that'll be stored away in roots and rhizomes, and a little bit will also go into reproduction. So, the manufacture of seeds. DR. MICHAEL...
View course Introduction to ecosystems
Level 1: Introductory 12 hrs
Metals in medicine
Science, Maths & Technology

Metals in medicine

...circulation. To obtain this information, the abnormal or diseased tissue has to stand out from those around it – its properties have to be sufficiently different from the properties of normal tissue or surrounding matter, to be distinguished by the techniques chosen for investigation. Can you list a few medical imaging techniques you are familiar with? X-ray, magnetic...
View course Metals in medicine
Level 2: Intermediate 12 hrs
Should we test drugs on pregnant women?
Health, Sports & Psychology

Should we test drugs on pregnant women?

...circulation, starving the body’s tissues of oxygen and causing periodic ‘crises’, or episodes of intense pain. Women with the disease are also at increased risk for having premature or abnormally small children, as well as miscarriages and stillbirths. The only medication known to actually treat sickle-cell patients’ underlying disease is an anticancer drug called...
View article Should we test drugs on pregnant women?
Article 15 mins
Inheritance of characters
Science, Maths & Technology

Inheritance of characters

...circulating in the blood. Working back through the albums, consider those individuals who have passed away and the reasons for their deaths, such as cancer or heart disease. All these visible and invisible characters of an individual and also their medical histories are governed by their genes and the environments in which they have lived. Genes are units of inheritance....
View course Inheritance of characters
Level 1: Introductory 4 hrs
Dirt, waste and revulsion: How cultures cope with leftovers and mess
Health, Sports & Psychology

Dirt, waste and revulsion: How cultures cope with leftovers and mess

...circulation, put dirty clothes away. Horrors! Martin Rowson: My father, who's a virologist, always used to say that penicillin was one of the worst things that happened culturally - not medically but culturally - because it made everybody terribly complacent. So when AIDS came along there was this terrible panic amongst the medical profession because they weren't used to...
View article Dirt, waste and revulsion: How cultures cope with leftovers and mess
Article 30 mins
Studying mammals: A winning design
Nature & Environment

Studying mammals: A winning design

...circulation) often increases, thereby augmenting the effect. Behaviour plays an important part in promoting heat loss amongst animals that live in hot, dry environments. As you've just seen, shade seeking is one familiar example; wallowing in cooling mud is another. Echidnas live in some of the hottest environments on Earth, with temperatures often approaching 40 °C, and...
View course Studying mammals: A winning design
Level 1: Introductory 10 hrs
National identity in Britain and Ireland, 1780–1840
History & The Arts

National identity in Britain and Ireland, 1780–1840

...circulating amongst you, the Pamphlets they are sending amongst you, and the conversation of the Castle, which is but the echo of the British Minister’s, amount to a plain declaration, that the Cabinet of England and the English Nation are determined to make the daring attempt, of robbing you of that Constitution, which your ancestors had long struggled for, which the...
View course National identity in Britain and Ireland, 1780–1840
Level 2: Intermediate 4 hrs