Background: Maximizing peak bone mass is advocated as a way to prevent osteoporosis. As a prerequisite to the elaboration of any preventive program aimed at rnaximizing peak bone mass, it is important to determine how the rate of skeletal growth at elinically relevant sites, such as lumbar spine(LS), femoral neck(FN), proceeds in relation to age and pubertal stages in both sexes. The present study was performed to measure bone mineral density(BMD) of Korean children and adolescents and to assess the influence of age, sex, puberty and body size on bone mineral density (BMD) during the period of bone growth. Method: Lumbar spine(LS), femoral neck(FN) BMD were measured in 199 healthy males and fernales 7~23 years of age using dual energy x-ray absorptiometry(DEXA), Tanner staging(TS) was used to assess stage of puberty. Results: Anthropometric measurements generally increased with tanner stage in both sexes. Sex differences were observed. In males, compared to females there were significantly higher in height(TS1, TS3, TS4, TS5), weight(TS1, TS3, TS5), dorsal hand skinfold thickness(TS1, TS5), and lean body mass(TS1, TS3, TS4, TS5): while in females, compared to males there were significantly higher in BMI(TS4), skinfold thickness except dorsal hand and fat %(TS3-TS5), and total fat mass(TS3, TS4)(p Adolescent ; Body Size ; Body Weight ; Bone Density ; Bone Development ; Child ; Female ; Hand ; Hip ; Humans ; Male ; Methods ; Miners ; Osteoporosis ; Puberty ; Sex Characteristics ; Skinfold Thickness

No abstract available.
Stents* ; Sutures* ; Vasovasostomy*

To compare several porcelains made by various manufacturers in shrinkage after firing and investigate the effect of condensation on shrinkage, specimens were prepared and the volume of each body was measured by the phase-shifting profilometry. Baseplate wax was cut by 2.5cmx2cm and cast in nonprecious metal (Verabond, U.S.A.). then any surfaces of specimens were abrased and polished on the SiC abrasing papers, preparing 120 specimens. specimens were divided into six groups according to the porcelain used, and the porcelain used in each group were as follows. Group I : Ceramco dentin porcelain Group II : Creation dentin porcelain Group III : Creation margin porcelain Group IV : Vintage margin porcelain Group V : Vita dentin porcelain Group VI : Vintage dentin porcelain Porcelain was built up on the metal plates using a small spoon and then solution matching to each porcelain was added. The six groups are subdivided into a and b. In subgroup a, only excessive solution was absorbed with tissue and in subgroup b, porcelain was condensed sufficiently. When build-up was completed, the shape was measured using the phase-shifting profilometry. After that, specimens were fired in the furnace programed for each porcelain and then their changed shape were measured again. Using the difference between the two above measurements, the ratio of shrinkage was calculated. Obtained results were as follows ; 1. Regardless of condensation, the volume of fired specimens were not different significantly between the two subgroups a and b in the same group. 2. The ratios of shrinkage were significantly higher in the groups porcelain built-up was condensed than in the groups not condensed. 3. The ratios of shrinkage were in the range of 36.81-27.19% in the groups porcelain built up was condensed and 44.52-37.54% in the other groups not condensed.
Dental Porcelain* ; Dentin ; Fires*

No abstract available.
Premenstrual Syndrome*

No abstract available.
Peritoneal Dialysis, Continuous Ambulatory*

No abstract available.
Evidence-Based Medicine* ; Korea*

No abstract available.
Coronary Artery Disease* ; Coronary Vessels* ; Education* ; Health Behavior*

No abstract available.
Marketing*

The lactic dehydrogenase activities of Ascaris lumbricoides have been assayed according to the developmental course of the fertilized eggs compared with the unfertilized eggs. Experimental procedures were modified that of Wroblewski and La Due's method with use of diphosphopyridine nucleotide reduced form(DPNH). Sodium pyruvate and lactic dehydrogenase, the specific activities were expressed as DPNH unit per mg protein by method of Kornberg's. The experimental results are as follaws: Lactic dehydrogenase activity in fertilized eggs of Ascaris are significantly increased from morula stage and its optimal pH is in 3.4 degrees. While any activities were not observed in unicell stage of fertilized eggs and unfertilized eggs. Water soluble protein of fertilized eggs of Ascaris were varied in their amount during their developmental process. The amont of protein in tadpole stage eggs have increased to 1.3 times more than that of cleavage stage eggs. However the amounts of water soluble protein in unfertilized eggs are revealed to one-third less than that of fertlized eggs. The specific activity of lactic dehydrogenase in tadpole stage eggs are decreased to one third less than those of morula stage eggs during development, the stage is considered to be as a growth criteria in developmental process, as on this point the activity of aerobic cytochrome c oxidase and cyclophorase begin to increase respectively.
parasitology-helminth-nematoda ; lactic dehydrogenase ; cytochrome c oxidaes ; cyclophorase ; Ascaris lumbricoides ; biochemistry

This study was made to investigate the influence of mouth breathing to tongue, mandible and hyoid bone position. It has been clinically suggested that the mouth breathing is induced by the respiratory dysfunction of nasopharyngeal airway causing by the Adenoids. The author used the 50 children, who were the nasal breathes with normal occlusion as the control group, and 50 children, who were mouth breathers with Adenoid as the experimental group. Results were as following: 1. In experimental group, the tongue was positioned more anterior and lower than that of the normal children. 2. In experimental group, the mandible was positioned more lower than that of the normal children. 3. In experimental group, the hyoid bone was positioned more anterior and lower than that of the normal children.
Adenoids* ; Child ; Humans ; Hyoid Bone* ; Mandible* ; Mouth Breathing* ; Mouth* ; Tongue*