While the rayed animals hungry, the controls were decidedly less active, had a waddling gait, and did not eat as much as the others. One the rayed animals gave birth need help writing nursing papers six young the thirty-seventh day The effects the radiations the mercury vapor quartz lamp the growth and calcification the skeleton the rat and the animal as a whole seem similar if not identical with, those brought about the direct sunlight and cod-liver the biological action the soft, or low frequency, x-rays with the hard, or high frequency rays. But varying the doses both kinds rays seems definitely proved that with the softer rays possible induce an apparent stimulation the lymphoid cells preceded only a very short transitory period depression. With the hard rays the stimulation phase less The study here recounted deals with the effect still softer x-rays than those used in previous experiments and for the generation these rays the special tube described below was used. The folloNsing the authors summary biological effect a small dose soft x-rays given off a special watercooled tube with a wmdow thin glass, operated at one-half inch spark gap and eleven Mice exposed for one minute show, two days later, the blood an mcrease the number lymphocytes and in the lymphoid organs an increased number mitotic figures. There occurs also a marked dilation the vessels the suprarenals, particularly between the cortex and the medulla. The latter conditiDn did not appear until after twenty-four hours, and was still present fourteen days after treatment. No change was Mice treated in this way showed a high degree resistance cancer transplants. The amount resistance varied with the time the inoculation after the treatment. The resistance was not increased before three days after, and was at its highest point ten The authors state further that, far as at present known, the only physical or chemical change induced the x-ray depends upon its power ionize if this true still a problem why some types animal cells are profoundly affected and others not at all affected the x-ray.
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Until has been determined that the dosage the same, the question whether this a real difference in write custom essays biological action must remain unanswered. The writers not believe that the changes here wrought in the lymphoid organs are the result direct action the rays. They incline this opinion partly because the small dosage and partly thesis to book because the deeper nodes reacted as much as more superficial ones.
The significance the changes in the suprarenal? not yet understood. The testicle and ovary, supposed extremely sensitive, are not at all affected this treatment.
The virulence the strain tumor used test the resistance the mice was such that so-called natural resistance was almost completely obviated. Studies X-ray Effects The Fate Cancer Grafts Implanted in Subcutaneous Tissue Previously Exposed X-rays.
Henk Liu. Ernest Sturm, and Jas. z-Jvslilule for Medical Research. erythem.a dose x-rays produces in the skin layers mice a reaction characterized lymphoid infiltration coincident with a local increase in resistance transplanted cancer. These x-ray areas are refractory custom handwriting paper subsequent intracutaneous inoculation cancer, but subcutaneous inoculation beneath the x-rayed areas results in the same number growths as in normal areas. This furnishes a possible explanation the different reactions x-rays skin cancer in man and the same cancer in the superficial lymph nodes man. To determine whether direct exposure the deeper tissues renders them refractory implanted cancer, a series experiments were carried out upon In one series tumor inoculation was made after exposure the subcutaneous tissue x-rays, using a three inch spark gap, ten, six inch distance, two and one-half minutes, over an area about one and one-haU extending laterally across the abdomen all the rest the animal's body was protected sheet lead.
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