Conclusion

  1. Eutrophication is a process in which an ecosystem accumulates mineral nutrients. It can occur naturally, but is usually associated with human activity that releases nutrients into the environment.

  2. Anthropogenic eutrophication has caused a widespread loss of biodiversity in many systems. Recent attempts to reverse the process are proving difficult and expensive.

  3. Symptoms of eutrophication are most readily seen in aquatic systems,
    Author(s): The Open University

    License information
    Related content

    Copyright © 2016 The Open University

Sargassum Fish
The sargassum fish can camouflage itself to look exactly like a sargassum plant and ambush unsuspecting prey with deadly ease. See these fish in action as well as learn information about them. The video can be used with a lesson on animal defenses and adaptations, specifically camouflage, protective resemblance, and mimicry. Run time 01:42.
Author(s): No creator set

License information
Related content

RVC 25 - The Role of Mitochondria in Health and Disease
Mitochondria are cell organelles which play a critical role in energy supply in most higher organisms. But how did that role develop and how do they achieve this function? In the latest episode of the RVC Podcast Dr Michelangelo Campanella discusses these questions and relates his research findings on how poor mitochondrial function can contribute greatly to disease processes.
Author(s): No creator set

License information
Related content

5.9 Membrane filtration

Membrane filtration is a process whereby particles smaller than about 10−2 mm (which can pass through sand filters) are removed using synthetic polymeric membranes and a high pressure. The membrane effectively acts as a sieve.

It is increasingly becoming popular as an advanced treatment process for water (especially for removal of Cryptosporidium) and wastewater (where water reuse takes place), and various possibilities are:

  • <
    Author(s): The Open University

    License information
    Related content

    Copyright © 2016 The Open University

7.340 Immune Evasion: How Sneaky Pathogens Avoid Host Surveillance (MIT)
Every infection consists of a battle between the invading pathogen and the resisting host. To be successful, a pathogen must escape the many defenses of the host immune system until it can replicate and spread to another host. A pathogen must prevent one of three stages of immune function: detection, activation, or effector function. Examples of disease-specific immune evasion and the mechanisms used by pathogens to prevail over their hosts' immune systems are discussed. Also considered is what
Author(s): Halme, Dina Gould

License information
Related content

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

An Implementation Brief: Evaluation of an Android-based mHealth System for Population Surveillance i
By: Jamia Presented by Zeshan A. Rajput
Author(s): No creator set

License information
Related content

Circulatory System Rap
This computer animated video is a circulatory system rap about the heart, sending blood to the lungs, and  arteries.  Lyrics are included on the screen.  (02:00)

Author(s): No creator set

License information
Related content

4.5 A critique of substantial equivalence

In the late 1990s, the principle of substantial equivalence came under sustained attack, and at this point it is worth examining both the points of criticism and the responses. In October 1999, Erik Millstone, Eric Brunner and Sue Mayer published a critical commentary on substantial equivalence in the journal Nature.

Before you read some extracts from this article it is worth commenting both on the nature of the article and who the authors are. The article is a 'commentary' publi
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

2.5 Wavelength

So far we have seen that sound is a pressure wave, and that the spacing of the pressure variations is related to the period of vibration of the source.

A graphical representation of the pressure wave from a tuning fork closely approximates to a certain type of wave known as a sine wave.

If we freeze the pressure wave as a snap shot in time, the variations in pressure with distance from the tuning fork can be plotted as a sine wave. The vertical axis is pressure so the crest
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Virtual yeast cell
This rich learning object is used to introduce yeast cytology to students taking Module D24BS3 Brewery Yeast Management as part of the MSc in Brewing Science. The virtual cell permits the students to understand structure and function of yeast organelles.
Author(s): Smart Katherine;Wang Steve

License information
Related content

Except for third party materials (materials owned by someone other than The University of Nottingham) and where otherwise indicated, the copyright in the content provided in this resource is owned by

7.342 Cancer Biology: From Basic Research to the Clinic (MIT)
This course is one of many Advanced Undergraduate Seminars offered by the Biology Department at MIT. These seminars are tailored for students with an interest in using primary research literature to discuss and learn about current biological research in a highly interactive setting. In 1971, President Nixon declared the "War on Cancer," but after three decades the war is still raging. How much progress have we made toward winning the war and what are we doing to improve the f
Author(s): Kim, Carla,Haigis, Kevin

License information
Related content

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

Lindy Hop - Hellzapoppin (1941)
Whitey's Lindy Hoppers excerpt from "Hellzapoppin" (1941) featuring Frankie Manning (in the Mechanic's Dungarees). (2:22)
Author(s): No creator set

License information
Related content

2.5 Surface mining

In surface mining (sometimes called 'opencast' mining in the UK), the coal seam is accessed by removing the rock overburden; a process that benefits from economies of scale by using some of the world's largest machines (Figure 15).

Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

4.1 Global coal reserves

Having looked in detail at how coal is mined, this section focuses on those areas of the world that produce it. It begins by looking at how and why reserves of coal are distributed throughout the UK and Europe, before reviewing the current global reserves of coal.


Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Male Giant Panda Bear Dust Bathing
This short video gives excellent real life footage of a male Giant Panda dust bathing. This is a great resource to help build background knowledge and to help make real world connections between nature and the classroom. (Less Than 2 Minutes)
Author(s): No creator set

License information
Related content

World's Young Ballet - Mikhail Baryshnikov
This fascinating look at world of international ballet competitions features a young Mikhail Baryshnikov competing and winning in Moscow in 1969. The Moscow International Competition of Ballet Artists at the Bolshoi Theater attracts young dancers from around the world to compete for gold and silver medals, much like the Olympics.
 (2:03)

Author(s): No creator set

License information
Related content

2.3.2 Inner experiences

A second kind of data is people's inner experiences, including their feelings, beliefs and motives. These cannot be directly seen from the outside; they remain private unless freely spoken about or expressed in some other way. Examples of these inner experiences include feelings, thoughts, images, representations, dreams, fantasies, beliefs and motivations or reasons. These are only accessible to others via verbal or written reports or as inferred from behaviours such as non-verbal communicat
Author(s): The Open University

License information
Related content

Copyright © 2013 The Open University

2 Discrimination in the labour market: introduction

Discrimination can manifest itself in all aspects of life. It may be evident in the type and location of housing available to certain groups, in their access to quality education and health care or how they are treated in the labour market. We will focus on the last of these considerations and, in particular, why the labour market status of some groups of workers is significantly worse than that for the population at large. This does not mean that discrimination in the labour market is a more
Author(s): The Open University

License information
Related content

Copyright © 2013 The Open University

6.2 The hypothalamus as central regulator

Research in the past 30–40 years has established that the hypothalamus, which lies below the thalamus and above the optic nerve chiasma and the pituitary gland in the brain, fulfils all of the functions listed above, at least in part. The main function of the hypothalamus is homeostasis. Factors such as blood pressure, body temperature, fluid and electrolyte balance, and body weight are held to constant values called the set-points. Although set-points can vary over time, from day to
Author(s): The Open University

License information
Related content

Copyright © 2016 The Open University

Sesame Street-Bowling Subtraction
Catchy little number from the good old days on Sesame Street with a bowling ball demonstrating subtraction. (0:55)
Author(s): No creator set

License information
Related content