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Distance Problem01:29

Distance Problem

52
When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
52
Brainstem01:19

Brainstem

6.0K
The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
The midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...
6.0K
Distance Corrections01:15

Distance Corrections

285
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
285
The Distance Formula01:20

The Distance Formula

600
In geometry, measuring the direct distance between two points on a plane is essential in various practical and theoretical applications. Whether in navigation, engineering, or computer graphics, determining the shortest path between two locations involves using the distance formula. This formula is derived from the Pythagorean Theorem, which relates the lengths of the sides of a right triangle. On a coordinate plane, the horizontal and vertical distances between two points serve as the legs of...
600
lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

9.8K
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
9.8K
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

17.6K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
17.6K

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相关实验视频

Updated: Jan 24, 2026

Author Spotlight: Investigating Anesthesia-Induced Sleep Pathways and Neuronal Excitability in Mice
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Author Spotlight: Investigating Anesthesia-Induced Sleep Pathways and Neuronal Excitability in Mice

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在老鼠大脑干中进行周周头距离编码.

Wenxi Xiao, Kyle S Severson, Hao Zheng

    bioRxiv : the preprint server for biology
    |January 23, 2026
    PubMed
    概括
    此摘要是机器生成的。

    鼠标脑干神经元使用近距离和地图代码编码对象距离. 抑制将触觉输入转化为空间地图,用于导航周围个人空间,这对运动和安全至关重要.

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    相关实验视频

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    科学领域:

    • 神经科学是一个神经科学.
    • 身体感官系统 身体感官系统
    • 计算神经科学是一种神经科学.

    背景情况:

    • 感知物体距离对于运动和避免危险至关重要.
    • 在活动感觉期间,触觉线索将距离信息在身体上.
    • 早期体感电路的距离提取机制尚未完全理解.

    研究的目的:

    • 调查小鼠胡须大脑干中的二阶神经元如何编码周围头部对象距离.
    • 确定这些神经元使用的编码方案.
    • 确定基础上的神经机制距离表示.

    主要方法:

    • 在清醒的小鼠中,在自然主义的墙壁穿越任务中,体内细胞外记录.
    • 分析神经元发射模式,以应对不同距离物体.
    • 扰动实验以评估多胡须集成和抑制的作用.

    主要成果:

    • 确定了两个距离编码方案:一个近距离代码 (随着接近而增加单调的发射) 和一个地图代码 (在特定距离上进行峰值调整).
    • 地图代码证明了优越的人口解码对象距离.
    • 发现多胡须集成和核内抑制有助于地图类调整.

    结论:

    • 大脑干电路在编码围绕个人空间距离方面发挥着重要作用.
    • 抑制作为神经比较器,将近距离输入转化为空间地图.
    • 这种类似地图的表示有助于指导运动和环境相互作用.