Pima Air and Space Museum , Tucson, Arizona

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Mywebschool Support Site

You can logon to the mywebschool support zone at

  www.mywebschool.org/postnuke/ 

Viruses and Bacteria…

What exactly is a virus? How does it differ from bacteria?

Bacteria and viruses can cause many diseases, but the distinction between the two forms of microbes is often vague and confused.

One of the main differences is the size. Compared bacteria, viruses are normally much smaller in size. The largest viruses are about the same size as the smallest bacteria.

One other striking difference is in the structure of the two types of microbes. Bacteria are complex structures, compared with viruses.

The structure of a single bacterium consists of a rigid cell, and a thin flexible membrane, which surrounds the cytoplasm, a fluid within the cell. A single bacterium has all the genetic data, the DNA, required to copy itself. This information databank is contained within the chromosome. There are other tiny portions of DNA, called plasmids which float around in the cytoplasm. To maintain the degree of complexity, there are also working tools, called ribosomes, which are essential for the bacteria to reproduce.

By comparison, a virus has a protein coat and a central core of DNA or RNA, the genetic material needed for reproduction. Sometimes it has an outer spiky layer called the envelope.


Two types of viruses

In comparison to bacteria, which have all the genetic blueprint and tools required to reproduce themselves, a virus needs to invade other cells in order to reproduce.

A hole is cut in the cell wall. The virus then injects its genetic material into the host cell. It then uses the hosts genetic machinery and instructs it to make new parts of the virus. These parts are then assembled together to form new viruses.

Here is an animated version of the sequence of events….

Now the really bad news occurs! These viruses can then break out of the host cell and each one can invade another new host cell. In this way the virus can replicate itself in increasing quantities every hour. Multiplication combines with a cascade effect, and an exponential rise of viruses.

New Images…

New images in the Flickr Image gallery….

www.flickr.com/photos/mjovery

Focus on Spain….

Costa del Sol

Bobcat, Tucson, Arizona….

P8040140, originally uploaded by mjovery.

Bobcat…..Tucson, Arizona, USA

Hummingbird Video


Hummingbird

Originally uploaded by mjovery

Hummingbird Video

Procedures in Science ……

Updates and reminders about science procedures (behaviour management) are given below:

scbasicprocedures.doc

Year 10 : Online Revision

Studnets can access the online revision website at

www.webschool.org.uk/revision/

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Hollingworth Lake, Rochdale, Lancashire

Looking for exercise, activity, as part of  your New Year’s Resolutions?

Hollingworth Lake covers an area of 130 acres (0.53 km²) and the path around it originally measured two-and-a-half miles, beneath the cold waters was the old hamlet of Hollingworth. The lake is still used for recreational purposes, and is classed as a national trust due to a nearby wildlife sanctuary. The lake was man-made in 1801 to supply water to the Rochdale Canal.

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Photos of Hollingworth Lake (MJOvery  www.flickr.com/photos/mjovery )

The lake boasts many watersports such as sailing, canoeing, swimming, rafting, rowing and fishing. Since 1989 Hollingworth Lake Water Activity Centre has offered quality tuition in outdoor activities. This provision has been available to schools, youth groups and the general public, continuing the proud tradition of water based activities o­n Hollingworth Lake. Visitors can also take trips across the lake o­n the launch ‘The Lady Alice’. Rowing Boats are also available to hire. The scenic walk around the lake is two and a half miles long and passes by a nature reserve with a bird hide. The lake is teeming with wildlife and is often used as a means of adventure activities for children, whereby they can catch various pond life.  (details originated from Wikipedia)

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Photos of Hollingworth Lake (MJOvery  www.flickr.com/photos/mjovery )

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Photos of Hollingworth Lake (MJOvery  www.flickr.com/photos/mjovery )

Hebden Bridge, Yorkshire

Images of Hebden Bridge, Yorkshire, England. Taken on December 23rd, 2007

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More images on   www.flickr.com/photos/mjovery