Generally, sport players of boxing or football who contact roughly with other players use mouth guard during match or game to prevent the breaking of jow boneor bursting of soft oral cavity . Moreover, mouth-guard are used for the purpose to lighter the load to root of teeth and to improve the skill and power of sport's player .The purpose of this study was to examine the charactaristic of unfitted by H shape-mouth guard compared to U shape mouth guard.The following results were obtained.1. The H shape-mouth guard of this study could reduce the impact to 1/7 level . 2. A relative decrease in ventilation level was shown when H shape mouth guard fitted .3. With reference to respiratory function , reduction of the amount of oxygen up-take was not observed at heart rate lower than 170 beats/min, and in this case a player feells subjective symptom of stiffing.
Using a post-embedding immunogold labeling procedure, we found that monoclonal antibody against A (MAb-A) or B antigen (MAb-B) reacted with nuclear heterochromatin regions, as well as secretory granules, in mucous cells of human cervical glands. Systematic and critical observation of specimens from 24 individuals of different blood groups revealed that the labeling pattern with MAb with strictly dependent on the blood group (A,B, or O) of the donors, i.e., MAb-A reacted with the heterochromatin from blood group A and AB but not with B and O individuals. Labeling with MAb-B was also specific for the heterochromatin from blood group B donors. On the other hand, MAb against H antigen did not react with the heterochromatin from any individuals examined, despite the fact that H antigens were detected by the MAb in secretory granules. Such specific reactions provide evidence that certain types of blood group-related antigens exist in the nuclear heterochromatin in mucous cells of human cervical glands. In contrast to the secretory granules in which ABH antigens were recognized by blood group-specific lectin, heterochromatin regions had little or no affinity for these lectins. Furthermore, the secretory status of individuals affected the staining intensity with MAb in secretory granules but not in the heterochromatin. These results suggest that the blood group substances found in the heterochromatin may have different molecular properties from those in the secretory granules, although both have the same determinant structures of ABH antigens.
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