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金奉龍 최신의학사 1967 最新醫學 Vol.10 No.10
The tissus mast cells were described in literature as a sorce of heparin, histamine, hyaluronic acid and serotonin. Although the cells in the connective tissue of the body were studied carefully, the correlation between the frequency of their appearance and ages of animals had not done satisfactorily determined. The author was interested in this subject and examined the mast cells in the mesenteries, skin, pancreas, uterus, and ovaries of rats aged 1, 3, 6, 12, 18 and 24 months. Each of the age groups consisted of five rats. Specimens were taken from the organs under a fresh condition(except specimens from mesenteries)and prepared by a general method for tissue mast cells. The mesenteries, thin membranes were cut from the animals and made into film preparations. In observation, the author divided the tissue mast cells of rats into four- types based on the distribution of the specific granulestype A,B and C which corespond to the cell granulated clossly, loosely or rarely in the cytoplasm and type D indicated the granules scattered outside of the cell body respectively. For the purpose of comparing the numbers of mast cells in individual organs or different age groups the author counted the number of cells by the magnification of 450 X. The average number of cells which was considered the relative number of each: group, was comFesed based upon the total number in 250 microscopic fields from each age group. The results were as follows: 1. The mast cells in the examined rats of different ages were most highly developed in the mesentery and the number of mast cells in each organ, was found in a descending order: skin, uterus, overy and pancreas. 2. The relative numbers of mast cells in the mesentery, pancreas and uterus increased gradually with age and showed the highest level at about the 18th month in the former two organs and at the 24th month in the Iatter. 3. Those of skin and ovary showed already the maximal value at about the third month in the former and at the sixth month in the latter, showed a constant number of cells in older age. 4. In general, the mast cells found in the mesenteries were mostly spherical or ovoid in shape but those in the other organs showed fairly many deformities. ~ 5. The granules of the tissue :east cells of rats were in general packed clossly in the cytoplasm and rarely found outside the cell body. Its stainability was intensely basophile- and metachromatic to usual basic aniline dyes regardless of the age of the animal
사이징과 고해에 따른 종이의 열화기구(제2보) -고해의 영향-
김봉용 한국펄프종이공학회 1999 펄프.종이기술 Vol.31 No.2
Three kinds of papers were prepared from different beating degree of pulps. Physical and optical properties were examined to elucidate the deterioration mechanism of paper according to beating degrees. Changes of double folds, elongation, water retention value, DP, K/S value and visible, UV region light absorption spectra of those papers treated by UV light were studied. Double folds and brightness were decreased more rapidly by UV treatment with increasing of beating degree. The light absorption rates of pulps in visible and UV region were also increased with change of beating level. The formation of new hydrogen bonds and higher light absorption rate of pulps according to beating induced to absorb and interact with much UV light. These phenomena maybe brought about to accelerate paper deteriortion by UV treatment both optical and physical properties.
사이징과 고해에 따른 종이의 열화기구(제1보)- 사이징의 영향 -
김봉용 한국펄프종이공학회 1998 펄프.종이기술 Vol.30 No.2
This study was carried out in order to elucidate the deterioration mechanism of paper according to various sizing chemicals. No additive paper and four kinds of papers containing rosin-alum, alum only, alkylketene dimer(AKD)-cation polymer and cation polymer only were treated by UV light to study changes of water-resistant, optical and mechanical properties from the view points of natural deterioration of paper. Since rosin chemicals have UV absorption at the relatively long wavelength region, rosins are degraded to form hydrophilic groups such as carboxylic acid from their double bonds by UV treatments. These phenomena caused the decreasing of sizing degree and wetting time in case of rosin-sized paper, while the UV treatments brought about the slight increase of wetting time in rosin-free papers such as no additive, alum and kymene only paper owing to the auto-sizing effect. Optical properties were primarily influenced by sizing chemicals. Rosin-sized paper showed lower brightness after UV and near UV treatment because of its UV instability.