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DNA – nuclear and mitochondrial

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Created: Tuesday, 17 April 2012 00:00
Written by Nadia O’Carroll

There was a time when only scientists talked about DNA (Deoxyribonucleic acid) now it has entered everyday conversation. DNA plays a vital and complex role in living organisms, but what is it?

DNA is a double stranded nucleic acid. It is present in most living organisms and determines their hereditary characteristics.

The structure of DNA resembles a ladder twisted into a spiral shape; this structure is described as a double helix. The two backbone strands consist of long polymers of nucleotides composed of sugar (deoxyribose) and phosphorus. The two strands are linked by hydrogen bonds between 4 types of complementary bases - adenine (A), guarine (G) cytosine (C) and thymine (T).

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Stygofauna – animals in aquifers

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Created: Thursday, 12 April 2012 00:00
Written by Nadia O’Carroll

The subterranean world is an unexplored, under researched frontier that we tend to regard as an empty place. Further exploration, although fragmentary, has revealed that a diverse range of fauna live underground.

The animals that live in aquifers, underwater pools and caves are called stygofauna. They inhabit a wide variety of groundwater environments – in both fresh and saline water, located in rock, clay, gravel, karst, sediment, fissures, cracks and caves. Stygofauna are found in all states of Australia, but appear particularly diverse in the desert regions where the underground water provides a refuge from the arid conditions on the surface above.

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The Magic of Fungus

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Created: Tuesday, 06 March 2012 00:00
Written by Nadia O’Carroll

The recent rain has produced a wide array of fungus, some of which display bizarre shapes, dazzling colours and bioluminescence.

Fungus are abundant and diverse. Visible fungus includes mushrooms, yeast, mould, mildew, puffballs and bracket fungi. Fungus accounts for approximately one quarter of the planet's biomass.

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Lost relatives – Extinct Humans

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Created: Tuesday, 20 March 2012 00:00
Written by Nadia O’Carroll

The closest living relations to modern humans (Homo sapiens) are the great apes – gorillas, orangutans, chimpanzees and bonobos. We had a common ancestor millions of years ago, before diverging along separate evolutionary paths. But it was only a few thousand years ago that Homo sapiens shared the planet with far closer relatives, other species of humans, all of these fellow hominids are now extinct.

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Clouds

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Created: Tuesday, 21 February 2012 00:00
Written by Nadia O’Carroll

Clouds are collections of water droplets or ice crystals suspended in the atmosphere.

They are classified by a system based on Latin words describing their height and appearance. Cirrus (hair), cumulus (heap), stratus (layer) and nimbus (rain bearing).

Low clouds are up to 2.5 kms altitude, middle are 2.5 to 6 kms altitude and high clouds exceed 6 kms in altitude.

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More Articles ...

  1. The Night Hunter
  2. Auroras
  3. Christmas Weather
  4. Thunderstorms
  5. Fog and Mist
  6. The Human Ecosystem
  7. Australasian Gannets - Plunge Divers
  8. Fireflies
  9. Ancient Marine Reptiles in Queensland
  10. Carbohydrates
  11. Red Cedar
  12. Chilled Out Lizards
  13. Gondwana
  14. Looking for Glossies
  15. Leeches
  16. Mistaken identity - Cane Toads and Brown Frogs
  17. Ocean waves and Tsunami – a comparison
  18. Liquefaction in Christchurch
  19. Myrtle Rust
  20. The winter nomad – Reindeer / Caribou

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Why does attentiveness to nature matter? In a very fundamental sense, we are what we pay attention to. Paying heed to beauty, grace, and everyday miracles promotes a sense of possibility and coherence that runs deeper and truer than the often illusory commercial, social "realities" advanced by mainstream contemporary culture. ... Our attention is precious, and what we choose to focus it on has enormous consequences. What we choose to look at, and to listen to--these choices change the world. As Thich Nhat Hanh has pointed out, we become the bad television programs that we watch. A society that expends its energies tracking the latest doings of the celebrity couple is fundamentally distinct from one that watches for the first arriving spring migrant birds, or takes a weekend to check out insects in a mountain stream, or looks inside flowers to admire the marvelous ingenuities involved in pollination. The former tends to drag culture down to its lowest commonalities; the latter can lift us up in a sense of unity with all life. The Way of Natural History, edited by Thomas Lowe Fleischner and published by Trinity University Press (Texas)