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相关概念视频

Production of Formed Elements01:34

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Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
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The discharge summary is crucial as it enables a smooth transition from a healthcare facility to a patient's home or another care setting. This critical document facilitates seamless continuity of care, ensuring patients receive the necessary support and attention.
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Cartesian Form for Vector Formulation01:26

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The Cartesian form for vector formulation is a process to calculate  the moment of force using the position and force vectors. The moment of force is defined as the cross-product of these vectors, making it a vector quantity. The Cartesian form of the position and force vectors involves unit vectors, which can be used to express the cross-product in determinant form.
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Differential Form of Maxwell's Equations01:17

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James Clerk Maxwell (1831–1879) was one of the significant contributors to physics in the nineteenth century. He is probably best known for having combined existing knowledge of the laws of electricity and the laws of magnetism with his insights to form a complete overarching electromagnetic theory, represented by Maxwell's equations. The four basic laws of electricity and magnetism were discovered experimentally through the work of physicists such as Oersted, Coulomb, Gauss, and...
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Indeterminate forms occur when evaluating limits leads to expressions that cannot be directly interpreted, such as zero divided by zero or infinity divided by infinity. These results do not describe the true behavior of a function near a given point and instead signal that additional analysis is required. L’Hôpital’s Rule provides a reliable method for resolving such ambiguities by replacing the original functions with their derivatives.Core Idea of L’Hôpital’s...
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Updated: Jan 27, 2026

Three-dimensional Angiogenesis Assay System using Co-culture Spheroids Formed by Endothelial Colony Forming Cells and Mesenchymal Stem Cells
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自己形成的岩基布

Joel S Scheingross1,2,3, Michael P Lamb4, Brian M Fuller4

  • 1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA. jscheingross@unr.edu.

Nature
|March 15, 2019
PubMed
概括
此摘要是机器生成的。

布可以在没有外部触发的情况下从均的岩层中自然形成. 水流,沉积物和侵蚀的不稳定性创造了这些地形,为景观演变提供了新的见解.

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科学领域:

  • 地形学
  • 地球科学
  • 水文学

背景情况:

  • 布是通过岩基切割影响景观演变的关键地形.
  • 它们作为海平面或构造变化的指标,并可以破坏下游的过程.

研究的目的:

  • 在受控条件下从平面岩层中研究布的内在形成.
  • 确定是否需要外部干扰来启动布.

主要方法:

  • 进行了一次流水试验,其中不断排水和沉积物供应.
  • 实验使用平面,均的岩床来观察地形的发展.

主要成果:

  • 布自发地从最初平坦的岩层中形成.
  • 流动液压,沉积物运输和岩层侵蚀之间的不稳定导致波浪床形的发展,进而演变为布.

结论:

  • 布的形成可能是一个由内部系统动态驱动的内在过程,而不仅仅是外部因素.
  • 区分自我形成和外部强迫的布可以提高从景观中重建地球历史的准确性.