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相关概念视频

Position and Displacement01:31

Position and Displacement

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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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Position and Displacement Vectors01:00

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To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position needs to be specified relative to a convenient frame of reference. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference to describe the position of an object in relation to stationary objects on Earth.
Further, several important kinds of...
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Position Vectors01:29

Position Vectors

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A position vector is a fundamental concept in mathematics that helps determine the position of one point with respect to another point in space. It is a vector that describes the direction and distance between two points. Position vectors are highly useful in the field of math and science, as they help represent spatial relationships and make calculations easier.
For instance, we want to locate a point P(x, y, z) relative to the origin of coordinates O. In that case, we can define a position...
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Anatomical Positions01:11

Anatomical Positions

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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
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Directional Terms01:14

Directional Terms

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Directional terms are essential for describing the relative locations of different body structures. For instance, an anatomist might describe one band of tissue as "inferior to" another, or a physician might describe a tumor as "superficial to" a deeper body structure. These terms often use comparative terms in pairs to trace out the relative locations of one body part to another or descriptions of body tissues like the deeper ones from superficially present with reference to...
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Position-effect Variegation02:32

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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相关实验视频

Updated: Jun 5, 2025

The Spatial Memory Game: Testing the Relationship Between Spatial Language, Object Knowledge, and Spatial Cognition
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找到位置信息的最后一点.

Lauren McGough1,2, Helena Casademunt3, Miloš Nikolić1

  • 1Joseph Henry Laboratories of Physics and Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton NJ 08544 USA.

PRX life
|December 12, 2024
PubMed
概括

发育中的胚胎的位置信息依赖于形态原度. 果间隙基因中的空间相关错误完善了位置精度,使独特的细胞规范成为可能.

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科学领域:

  • 发育生物学是发展生物学.
  • 系统生物学 系统生物学
  • 遗传学 是一个遗传学.

背景情况:

  • 胚胎发育中的细胞位置是由形态原度决定的.
  • 果的间隙基因在前后轴上提供精确的位置信息.
  • 现有的精度不足以进行独特的细胞身份规范.

研究的目的:

  • 为了研究位置信息是如何精细化为独特的细胞规范.
  • 为了确定位置错误中的空间相关性是否弥合了信息差距.
  • 将这些相关性与上游缺口基因网络联系起来.

主要方法:

  • 位置错误相关性的理论建模.
  • 对对规则基因条纹位置的相关性进行实验验证.
  • 追溯相关性回到基因表达模式的差距.

主要成果:

  • 理论模型表明,与空间相关的错误 (约. 20%的胚胎长度) 弥合了信息差距.
  • 实验数据证实了这些相关性在对规则基因条纹中的存在和强度.
  • 相关性被追溯到上游的缺口基因网络.

结论:

  • 空间相关的位置错误对于在发育胚胎中实现独特的细胞特异性至关重要.
  • 这一发现支持对遗传网络信息流的精确主义观点.
  • 准确的位置信号在早期建立并通过发育过程保持.