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相关概念视频

Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary...
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Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
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Density00:56

Density

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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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Strain-Energy Density01:20

Strain-Energy Density

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Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this...
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Vertebral Column: Regions and Curvature01:16

Vertebral Column: Regions and Curvature

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The vertebral column or spine is a flexible column that supports the head, neck, and body and  allows for their movements. It also protects the spinal cord.
Regions of the Vertebral Column
In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form...
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相关实验视频

Updated: May 29, 2025

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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描述人类椎椎间盘的基线固定电荷密度.

Nathan Buchweitz1, Yi Sun2, Sarah Cisewski Porto3

  • 1Department of Bioengineering, Clemson University, Clemson, SC, United States.

Journal of biomechanics
|February 1, 2025
PubMed
概括

这项研究量化了人类椎盘的固定电荷密度,发现端板的水平高于纤维状圆环. 这些电生物力学数据为宫椎盘功能和潜在的损伤机制提供了洞察力.

关键词:
宫脊椎的部 脊柱的部 脊柱的部电导率 电导率 电导率 电导率固定电荷密度 固定电荷密度椎间盘之间的椎间盘.

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科学领域:

  • 生物医学工程 生物医学工程
  • 脊柱生物力学 脊柱生物力学
  • 组织工程是组织工程.

背景情况:

  • 由蛋白质甘氨酸驱动的椎间盘中固定电荷密度会影响透压和胀.
  • 之前的研究特征区域固定电荷密度在腰椎盘,但不是宫椎盘.
  • 了解椎盘的电生物力学对于诊断和治疗脊柱疾病至关重要.

研究的目的:

  • 量化人类椎间盘的固定电荷密度.
  • 为了比较椎盘不同区域的固定电荷密度 (细胞核,纤维环,软骨末端板).
  • 为了将固定电荷密度与椎盘中的糖氨基甘氨酸含量和多孔性相关联.

主要方法:

  • 利用两点电导率方法测量新冷的人体尸体椎盘中的固定电荷密度.
  • 评估的糖氨基含量和孔隙度以及固定电荷密度.
  • 分析了五个人类捐赠者的数据,以确定区域模式和相关性.

主要成果:

  • 固定电荷密度在椎盘的软骨末板区域是最高的.
  • 在核脉和纤维环之间没有发现固定电荷密度的显著差异.
  • 葡萄糖氨基甘氨酸含量与所有地区的固定电荷密度有很强的相关性.
  • 与腰椎相比,宫椎盘在核和圆环之间表现出更为均的固定电荷密度.

结论:

  • 椎盘的固定电荷密度模式不同于腰椎盘,可能是由于适应灵活性和减少胀.
  • 端板固定电荷密度升高可能会保护移动椎脊柱的圆盘-脊椎骨接口.
  • 这些发现为椎盘的电生物力学和组织特征提供了重要的基准.