5 0 0 0 人魚の話
- 著者
- N. M.
- 出版者
- 社団法人日本動物学会
- 雑誌
- 動物学雑誌 (ISSN:00445118)
- 巻号頁・発行日
- vol.1, no.1, 1888-11-15
3 0 0 0 Integrals and series
- 著者
- ROBIN N.M. FEENEY JOHN P. ZERMENO DONALD J. REID SYOZI NAKASHIMA HIROSHI SANO ARMASASTRA BAHAR JEAN-JACQUES HUBLIN TANYA M. SMITH
- 出版者
- The Anthropological Society of Nippon
- 雑誌
- Anthropological Science (ISSN:09187960)
- 巻号頁・発行日
- vol.118, no.3, pp.191-198, 2010 (Released:2010-12-21)
- 参考文献数
- 48
- 被引用文献数
- 25 35
Dental enamel thickness continues to feature prominently in anthropological studies of ape and human evolution, as well as studies of preventative oral care and treatment. Traditional studies of enamel thickness require physical sectioning of teeth for linear and scaled measurements. Recent applications of microtomographic imaging allow scientists to employ larger and more diverse samples, including global samples of recent humans as well as fossil hominin teeth. Unfortunately, little is known about the degree of enamel thickness variation among human populations, particularly across the dentition. This study employed microtomography to virtually image, section, and quantify the average enamel thickness of a sample of clinically extracted Indonesian canine and premolar teeth. This virtual sample was compared to physically sectioned African and European teeth. The results demonstrate that average enamel thickness is similar among human dentitions; no significant differences were detected within tooth positions, which is surprising given developmental differences between European and African canines and premolars. When populations were combined, differences were found in average enamel thickness between maxillary and mandibular premolars, and between canines and premolars within both dental arcades. This finding is potentially due to differences in premolar morphology and a trend of increasing enamel thickness distally throughout the dentition. The finding of limited population variation within tooth positions and significant variation between tooth positions is consistent with previous two-dimensional and three-dimensional studies of human molar enamel thickness. Average enamel thickness in canines and premolars does not differ between the sexes in our sample, although male teeth tend to have larger enamel and dentine cross-sectional areas, enamel–dentine junction lengths, and bi-cervical diameters. Males have significantly greater dentine area and enamel–dentine junction length than females for maxillary canines and premolars. The results of this study suggest that enamel thickness values in mixed-populations of humans are appropriate for comparisons with fossil hominins.
- 著者
- TERAKADO Yasutaka ASAGOE Yuma KOGA Toshiki NASHER N. M. Refat
- 出版者
- 神戸大学大学院人間発達環境学研究科
- 雑誌
- 神戸大学大学院人間発達環境学研究科研究紀要 (ISSN:18822851)
- 巻号頁・発行日
- vol.9, no.1, pp.73-80, 2015-09
- 著者
- Ildikó V. TÓTH Inês C. SANTOS Cláudia F. M. AZEVEDO Jorge F. S. FERNANDES Ricardo N. M. J. PÁSCOA Raquel B. R. MESQUITA António O. S. S. RANGEL
- 出版者
- (社)日本分析化学会
- 雑誌
- Analytical Sciences (ISSN:09106340)
- 巻号頁・発行日
- vol.29, no.5, pp.563-570, 2013-05-10 (Released:2013-05-10)
- 参考文献数
- 30
- 被引用文献数
- 3 5
In this work, aiming to develop a simple, inexpensive method for the determination of low bromate levels in water samples, a liquid waveguide capillary cell (LWCC) was coupled to a FIA system. The long optical path (100 cm) of the LWCC was used to improve the sensitivity and the limit of detection without resorting to any off-line or in-line preconcentration processes. The spectrophotometric determination was based on the oxidation of chlorpromazine by bromate in an acidic medium, resulting in the formation of a colored radical product. Sulfamic acid was added to the reagent for minimizing the interference of nitrite, and a chelating ion exchange resin was used to remove major cationic interferences. The developed system allowed the determination of bromate within the range between 1 – 20 μg L−1 with a detection limit of 0.2 μg L−1.