| 4 | Production of Hypoxia-induced Corneal Edema in Aged Eyes显示文摘Purpose:Corneal thickness assessment is a common clinical procedure applied in corneal and contact lens care. This study aims to investigate the effect of age on hypoxia-induced corneal swelling.Methods:Eighteen male subjects were equally divided into the younger [(23.7 ± 0.8) years old] and older [(74.4 ± 2.5) years old] groups. Each subject wore a thick soft contact lens (uniform thickness of 0.3 mm) on the left cornea. With the contact lens in place, the baseline central corneal thickness was measured using a specially designed photo-pachometer. The lens was then patched behind the closed eyelids, producing an extremely hypoxic stress to the cornea. The change in central corneal thickness was monitored every 20 minutes with momentary disruptions to the hypoxic stress over the next 2 hours. The increase in thickness was taken as an index of corneal edema. The rate of change in corneal thickness, as derived from a non-linear mathematical model, was compared between groups.Results:The corneal thickness of both age groups increased significantly with time (P<0.000 1). The mean corneal swelling constant for the older subjects was 16.5 × 10-3 (S.E.M. = 2.65 × 10-3) and the value for the younger subjects was 46.5 × 10-3 (S.E.M. = 3.25 × 10-3). The difference was statistically significant (P < 0.000 1).Conclusion:Aging cornea has a slower hypoxia-induced edema response compared with the younger group. Whether it is caused by a decreased corneal lactate production or an increased resistance to physical expansion deserves further investigation. Eye Science 2004;20:1-5. | Alan K. Cheung Andrew W. Siu Digby W. Cheung Edwin C. Mo | 2004 | Eye Science2004，20，1： | 0 |
| 5 | Characteristics of Algal Succession Following Rock Scraping at Imwon Area in the East Coast of Korea显示文摘This study was conducted to clarify the characteristics of algal succession following rock scraping using hoe or high-pressure water sprayer in the period from June 2010 to April 2011. We divided the research area off the eastern coast of Korean near Imwon into 3 categories depending upon the severity of the barren ground, i.e., the urchin barren-affected, urchin barren-ongoing and urchin barren-free areas. In April 2011, in the urchin barren-affected area with 25 seaweed species, the cover percentage and importance value(IV) of crustose coralline algae were higher than those of other species. In the urchin barren-ongoing area with 33 seaweed species, crustose coralline algae(mean IV = 62%) as well as Sargassum sp.(mean IV = 28%), and Gelidium amansii(mean IV = 19%) were observed following rock scraping. In the urchin barren-free area where seaweed communities were relatively abundant with 42 species, a variety of algal species including G. amansii(mean IV = 32%) underwent algal succession. Overall, it was observed that, as an aspect of algal succession, the weaker the barren ground severity was, the more frequent and diverse the seaweeds were, and the more complex the succession pattern was in the study. As an aspect of recovering algal community, rock scraping using hoe was shown to be superior to the method using high-pressure water spraying. Therefore, we conclude that rock scraping using hoe is a very effective strategy for recovering the algal community in urchin barren-ongoing area. | Young Dae Kim Jung Kwan Alan Myung Mo Nam Chu Lee Hyun Il Yoo Su Yeoung Yeon Young Hwan Kim Jang Kyun Kim Jae Suk Choi | 2016 | Journal of Ocean University of China2016，15，6： | 0 |
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