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 may be nourrished and flourish. " (MENCIUS, in "The Doctrine of the Mean." ) of their common atmosphere a few of the crops and animals that experience inhabited a zone for a long time have came across a ordinary stability. The inhabitants of vegetation and animals of the sort of zone looks to control itself automobile matically; the variety of each one species is stored inside fairly strict limits through a common stability of forces. The advent of a brand new aspect in such an equilibrated state of affairs can result in a "disaster" whilst the stability of forces that acted as an ideal self-steering equipment up until eventually the advent of that new aspect, fails to maintain the variety of that point less 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 contain any of the rabbit's "natural enemies" a "rabbit inhabitants explosion" this unsatisfied selection. An equilibrated state of affairs can develop into disturbed differently. An instance of one other kind of (man's) "interference with nature's stability of forces" is the creation of contemporary expertise and medication in up until eventually lately "backward" nations. the resultant elevate in to be had meals and the higher hygienic criteria got rid of the older assessments on inhabitants bring up equivalent to famine and peri-natal dying.
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Additional resources for An Experimental Study of Pituitary Tumours: Genesis, Cytology and Hormone Content
O. O. 2. O. 1. O. O. O. 4. o. o. o. O. 9. O. O. O. O. 2. O. O. O. O. 1. O. 1 Pituitary weight data of males, orchidectomized males, females and spayed females in the different treatment groups have been pooled. 2 "Duration of treatment" for the untreated rats = actual age 75 days. 3 Administration of radioactive iodine in this group of rats resulted in an incomplete destruction of the thyroid gland in the majority of animals (see text). 4 n. = number of pituitaries weighing 12 mg or less, considered "normal".
Pituitary tumours in orchidectomized cr cr rats chidectomizedR-Amsterdam R-Amsterdam by continuous oestrone administration rats, are remarkably consistent with the theory of CLIFTON and MEYER and with their results in Sprague Dawley rats, since there is fair agreement with their conclusions on the percentage of cell of the normal pituitary participating in the process of proliferation as well as on the "doubling time". Adopting their theory that the . Discussion and conclusions 41 enhancement of the mitotic rate caused by oestrogens sets in immediately and therefore coincides with the beginning of treatment the results of the present experiment suggest approximately 3 %and approximately 20 days respectively, compared to 1 % and 30 days in their experiment.
Materials and methods 29 Check on thyroid destruction: 'The trachea and its overlying musculature including the whole thyroid gland region were removed from the first twenty mice given 131I and serially sectioned at 4 fl. One out of every ten sections was examined microscopically for residual thyroid tissue. Only hyalinized or calcified scar-tissue was found, the bloodvessels in the neighbourhood showing the characteristic thickening. Only occasionally a few cells, which may have been epithelial remnants of the thyroid gland were seen within this scar-tissue.
An Experimental Study of Pituitary Tumours: Genesis, Cytology and Hormone Content by Hong Giok Kwa