Download e-book for kindle: Darwin on Humus and the Earthworm: The Formation of by Charles Darwin

By Charles Darwin

The booklet most sensible referred to as Worms, known as earthworms, used to be Charles Darwin's final medical publication. He studied the earthworm habit and ecology. The malicious program ecology used to be the 1st vital paintings on soil bioturbation, the reformation of soils and sediments via animals or vegetation.

The results of bioturbation include altering the feel of soil or diagenesis, the switch of sediments of sedimentary rocks into forming one other sedimentary rock in the course of and after rock formation. Bioirrigation, the method of benthic organisms flushing their burrows with overlying water, benthic organisms, often called the benthic area, are the gang of organisms that dwell close to the seabed. one other impact of bioturbation is the displacement of microorganisms and non-living debris.

After his large paintings on his usual background collections, the voluminous Zoology of the Voyage of H.M.S. Beagle, containing the topics, mammals and coral formations, Darwin went domestic in and stayed along with his family members, domestic of his uncle Josiah Wedgwood. Darwin's uncle saw in a definite sector of the soil the place lime and cinders lie had disappeared. Uncle Jos stated that this would were brought on by earthworms. His nephew discovered it attention-grabbing and engaged in learning at the works of earthworm remodeling coral polyps from the land of the tropical sea.

Darwin offered his idea on worms forming mold with the worms' position in soil formation. He awarded it to the Geological Society of London. His colleagues have doubts approximately Darwin's paper, that it isn't regarding their subject material, as they anticipated anything extra approximately geology. however the best geologist William Buckland favorite to submit Darwin's paintings, because it is a vital research because it is a brand new Geological strength.

Charles Robert Darwin was once an English biologist, naturalist and geologist, and is known for his examine at the technological know-how of evolution. he's recognized for his books, The Voyage of Beagle and at the starting place of Species.

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Extra info for Darwin on Humus and the Earthworm: The Formation of Vegetable Mould through the Action of Worms with Observations on Their Habits

Sample text

G. plexus chorioideus and kidney) is well known. A similar ultrastructure is found in epithelia specialized for active ion transport (gills, salt glands, rectal glands: Berridge and Oschman, 1972), which have no brush border. These examples show that the direction of transport cannot be deduced solely from the ultrastructure. Criteria for the likelihood of an apicobasal direction of transport, however, is the presence of a brush border, combined with a basal labyrinth rich in mitochondria (Thoenes, 1973).

All transitional stages between apical vacuoles (A V) and phagolysosomes (Ly) are found. Vesicular elements predominate in the zone of transport tubules (1'1'). The basal labyrinth is distinct. Bm = Basement membrane, L = Lipid droplets, P = Perixisome, T = Terminal bar. X 19,000 4 Advances in Anatomy , Vol. 52/3 49 Free ribosomes are plentiful in immature apical cytoplasmic protrusions and in the basal cytoplasm, which is less rich in other organelles. The SER is inconspicuous in the proximal tubule.

Our own fmdings in the cat, where lipid droplets appear in larger numbers in the maturing proximal tubule long before the onset of regression, and similar observations by Davies (1952) in the sheep confirm the hypothesis that lipid accumulation here is due to a specific metabolical activity. It seems not to be a species peculiarity, like the abundance of fat in the feline metanephros, as lipid vacuoles also appear in the mesonephroi of those specie whose metanephros is devoid of lipid (Davies, 1952).

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Darwin on Humus and the Earthworm: The Formation of Vegetable Mould through the Action of Worms with Observations on Their Habits by Charles Darwin


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