Download An Experimental Study of Pituitary Tumours: Genesis, by Hong Giok Kwa PDF

Download An Experimental Study of Pituitary Tumours: Genesis, by Hong Giok Kwa PDF

By Hong Giok Kwa

"Let the states of equilibrium and concord exist in perfection and a contented order will be successful via heaven and earth and all issues can be nourrished and flourish. " (MENCIUS, in "The Doctrine of the Mean." ) of their ordinary surroundings many of the crops and animals that experience inhabited a zone for a while have came upon a traditional stability. The inhabitants of vegetation and animals of one of these sector appears to be like to manage itself automobile matically; the variety of every one species is stored inside of quite strict limits through a ordinary stability of forces. The creation of a brand new point in such an equilibrated scenario may end up in a "disaster" whilst the stability of forces that acted as an ideal self-steering equipment up until the creation of that new point, fails to maintain the variety of that aspect lower than keep watch over. a well-known instance for this kind of (man's) "interference with nature's stability of forces" is the importation of rabbits in Australia. simply because Australia's fauna didn't comprise any of the rabbit's "natural enemies" a "rabbit inhabitants explosion" this unsatisfied determination. An equilibrated state of affairs can develop into disturbed otherwise. An instance of one other form of (man's) "interference with nature's stability of forces" is the advent of contemporary know-how and medication in up until eventually lately "backward" nations. the resultant increase in to be had foodstuff and the higher hygienic criteria got rid of the older assessments on inhabitants elevate equivalent to famine and peri-natal dying.

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Extra resources for An Experimental Study of Pituitary Tumours: Genesis, Cytology and Hormone Content

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O. O. O. O. n. = number of pituitaries weighing 3 mg or less, considered "normal". e. = number of pituitaries weighing between 3 mg and 12 mg, considered "enlarged" . t. = number of pituitaries weighing 12 mg or more, considered "tumourously enlarged". tary tumours. The apparent difference between them is due to the method of classification of the pituitaries. The complete preventive action of continuous thyroxin administration is clearly demonstrated and is in agreement with the results of GOLDBERG and CHAIKOFF (1951).

6. O. + O. 2. 1. O. O. 2. 2. 1. + O. O. 3. 3. 1. 1. 14. O. O. O. O. O. O. O. O. O. n. = number of pituitaries weighing 3 mg or less, considered "normal". e. = number of pituitaries weighing between 3 mg and 12 mg, considered "enlarged" . t. = number of pituitaries weighing 12 mg or more, considered "tumourously enlarged". tary tumours. The apparent difference between them is due to the method of classification of the pituitaries. The complete preventive action of continuous thyroxin administration is clearly demonstrated and is in agreement with the results of GOLDBERG and CHAIKOFF (1951).

This is in agreement with the results described by others (GORBMAN, 1956; DENT, GADSDEN and FURTH. 1956. ). The pituitary enlargement resulting from combined treatment of mice with oestrone and methylthiouracil was not as pronounced as after oestrone alone. This appears to be in agreement with observations on rats (GILLMAN and GILBERT, 1955). Thus it appears that methylthiouracil inhibits the induction of pituitary tumours by oestrone. It may be presumed that this effect of methylthiouracil is due to the depression of metabolism caused by thyroid hormone deprivation.

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