相关实验视频
Updated: Feb 8, 2026

08:37
Corneal Donor Tissue Preparation for Endothelial Keratoplasty
Published on: June 12, 2012
28.2K
在国际运输的捐赠者角膜中,内皮损伤的临床预测因素
Chiaki Imafuku1, Kengo Yoshii2, Jumpei Kishi1
1Department of Biomedical Engineering, Faculty of Life and Medical Sciences, Doshisha University, Kyotanabe, Japan; and.
Cornea
|February 6, 2026
概括
捐赠者的角膜运输到日本揭示了影响内皮细胞损伤的关键因素. 捐赠者的种族,年龄,死亡原因和眼睛银行的起源显著影响到达时的角膜健康.
科学领域:
- 眼科医生 眼科 眼科
- 移植科学 移植科学
- 角膜研究 角膜研究
背景情况:
- 国际角膜移植依赖于全球运输的供体角膜.
- 了解影响捐赠者角膜质量的因素对于成功的移植结果至关重要.
- 当前的协议可能无法完全考虑在运输过程中影响内皮质完整性的所有变量.
研究的目的:
- 在国际运输过程中确定影响角膜内皮损伤的临床因素.
- 为了评估捐赠者角膜在抵达日本时的状况,模拟真实世界的进口场景.
- 为改善捐赠者角膜保护和运输协议提供见解.
主要方法:
- 从美国眼睛银行运送到日本的194个捐赠角膜的分析.
- 使用蓝色染色和基于Python的定制图像分析量化内皮质损伤的量化.
- 统计分析 (单变量,多变量,通用线性混合模型) 以确定内皮损伤的预测因子.
主要成果:
- 大多数角膜 (62.4%) 的内皮损伤最小 (<2%).
- 增加内皮损伤的独立预测因素包括眼睛银行来源,年轻的捐赠者年龄,黑人捐赠者种族,以及特定的死亡原因 (胃肠道疾病,恶性瘤).
- 从死亡到捐赠的时间和保存时间都没有预测到损害.
结论:
- 在国际运输的供体角膜中确定了影响内皮完整性的现实世界因素.
- 强调了除了保存时间之外,与捐赠者相关的因素的重要性.
- 解决了全球眼睛银行和国际角膜捐赠的未被认可的方面.
相关概念视频
Internal Energy
36.8K
The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with initial internal energy, Uinitial, undergoes a change in energy (transfer of work or heat), and the final internal energy of the system is Ufinal. Change in internal energy equals the difference between Ufinal and Uinitial.
36.8K
Internal Energy
7.1K
The internal energy of a thermodynamic system is the sum of the kinetic and potential energies of all the molecules or entities in the system. The kinetic energy of an individual molecule includes contributions due to its rotation and vibration, as well as its translational energy. The potential energy is associated only with the interactions between one molecule and the other molecules of the system. Neither the system's location nor its motion is of any consequence as far as the internal...
7.1K
Internal Receptors
74.7K
Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
74.7K
Facilitated Transport
149.5K
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
149.5K
Primary Active Transport
199.4K
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
199.4K
Secondary Active Transport
138.1K
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
138.1K

