Download An Introduction to Biochemistry by William Robert Fearon (Auth.) PDF

By William Robert Fearon (Auth.)

ISBN-10: 1483200361

ISBN-13: 9781483200361

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Its significance is unknown. Group III : Boron, Aluminium. n. w. 11. This non-metal has been detected in all plants examined. The value is least in cereals (the ash of which contains about 0-5 gm. ), high in t h e beetroot, and maximal in the date fruit (30 mg. B per kg. pulp). Grape vines a n d wine are rich in boron. Sea water contains about 4-5 mg. B per litre. Borates must form an important p a r t of the buffer mechanism of sea water, being second only t o carbonates, and exceeding t h e combined effects of phosphates, arsenates and silicates.

He observed that in malignant tumours or in the blood and liver in cases of leucocythaemia—both tissues in which mitosis is pro- 24 AN I N T R O D U C T I O N TO BIOCHEMISTRY ceeding very rapidly—the zinc content was from 3 to 18 times t h e normal. Cruickshank (1936) has surveyed t h e sources a n d distribu­ tion of zinc in relation to h u m a n nutrition, and claims t h a t tubercu­ losis is associated with a zinc deficiency, and malignant conditions with chronic zinc poisoning. Beri-beri m a y be due partly t o zinc deficiency (Eggleton, 1939).

I per 100 gm. fresh tissue. Other organs have values ranging from 1 mg. in liver and kidney down to 0-01 mg. in blood. The iodine value of the thyroid depends primarily on the iodine intake, and to a lesser extent on species, age, and sex. The content is usually inversely proportional to the size of the gland, and is subnormal in all condi­ tions of simple goitre. The blood iodine level may rise to 0-04 mg. I per 100 ml. in exophthalmic goitre, and fall to less than 0-003 in simple goitre. The recorded urinary output ranges from 0 030-173 mg.

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