The folic acid antagonists and their use is the treatment of acute leukemia

Thesis (M.D.)--Boston Universit

CAN THE UNITED STATES COMPETE WITH DAIRY EXPORTING NATIONS?

International Relations/Trade,

Alien Registration- Boyd, George H. (Easton, Aroostook County)

https://digitalmaine.com/alien_docs/26592/thumbnail.jp

Solutions of rational integral equations for complex roots

Thesis (M.A.)--Boston University, 1936. This item was digitized by the Internet Archive

Some aspects of the metabolism of the developing chick embryo: the metabolism of 'biologically labile' methyl groups

Excluding inorganic ions and molecules, the methyl group is surely one of the simplest chemical units encountered in the living cell. This radical is found in biological material in covalent combination with various elements, yielding molecules well known to the organic chemist, which could be classified as follows:-(a) Methyl group attached to nitrogen, as in choline, creatine and adrenaline.(b) Methyl group attached to sulphur, as in methionin and dimethylthetin.(c) Methyl group attached to sulphur, as in methionin and dimethylthetin. attached to carbon, as in alanine, valine and thymine.(d) Methyl group attached to oxygen, as in alkaloids such as narcotine.(e) Methyl group attached to metalloids such as selenium, tellurium and arsenic, yielding selenides, tellurides and arsenides.Whilst the methylated nitrogen, sulphur and are widely distributed in the kingdoms, the methyl ethers and methylated metallic complexes are rareties, occurring in certain highly specialized organisms, or under non -physiological circumstances. For this and other reasons to be elaborated later, the subject of biological methylation was for long mainly confined to the study of methyl groups attached to nitrogen or sulphur and was only quite recently extended to include methyl - carbon compounds. The phenomena of synthesis, transport and degradation of the methyl group have occupied the attention of physiologists and biochemists during the greater part of the twentieth century. Although these problems have not been settled, the groundwork has been laid to open the way to a fuller elucidation of the role of the methyl radical in biochemical processes

The Limitations of Present Computative Methods of Studying Liquid Structure

The inadequacy of the approximate method of x-ray diffraction intensity computation in the case of liquids is illustrated by computations relative to n-paraffins. Warren apparently proved, by using Zernike and Prins theory, that the structure of the liquids is hexagonal parallel packing. These computations have been repeated and extended to larger scattering angles. Similar calculations were made for the parallel packing. Conclusive proof for either array was not found. Preference, however, due to peak position, should be given to the former. The work emphasizes the need for a better theoretical approach to the problem of liquid structure in explaining the scattering of x-rays

Alien Registration- Boyd, George E. (Brewer, Penobscot County)

https://digitalmaine.com/alien_docs/11362/thumbnail.jp