This baby, pictured in yellow, is a nucleus. They contain genetic information for every single eukaryotic cell (apart from mitochondrial DNA, and the DNA of chloroplasts). They are the most conspicuous organelle under the microscope, appearing as a darker, denser area. The nuclear envelope separated the nuclear contents from the cytoplasm. The double membrane 9nuclear envelope) is periforated by pores 100nm in diameter. At the lip of each pore, the inner and outer membranes are continous, leaving a space between them of 20-40nm. The inside of the envelope is lined with the nuclear lamina, a netlike array of protein filaments which serve to maintain shape. There is also much evidence for a nuclear matrix within. DNA is present as chromatin or chromosomes in the nucleus, with each species having a characteristic number of chromosomes and genes. A nucleolus is present within the nucleus and is identified as densely stained granules and fibres. The nucleolus synthesises rRBA and studies suggest it also plays a part in is regulation of cellular processes (such as division).
Mediterranean Diet Linked to Better Quality of Life
For years the Mediterranean diet has been associated with a lesser chance of illness and increased well-being. A new study has now linked it to mental and physical health too. The Mediterranean diet, which is characterized by the consumption of fruit, vegetables, pulses, fish, olive oil and nuts, has been proven to be beneficial to the health in terms of a lesser chance of chronic illness and a lower mortality rate.
A new study headed by the Univ. of Las Palmas de Gran Canaria and the Univ. of Navarra took the next step and analyzed the influence of the Mediterranean diet on the quality of life of a sample of more than 11,000 university students over a period of four years.
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