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相关概念视频

Motion of a Projectile01:23

Motion of a Projectile

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Projectile motion becomes evident when a player kicks the ball into the air. The launch angle, or the angle at which the ball is kicked, plays a crucial role in determining the trajectory of the projectile. As the ball soars through the air, influenced solely by gravity, its motion can be dissected into two independent velocity components: the horizontal and the vertical.
Horizontal motion, governed by the initial kick, maintains a constant velocity throughout the flight of the soccer ball.
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Projectile Motion01:20

Projectile Motion

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An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called projectile motion, and the object itself a projectile. The parabolic path followed by the projectile is called the trajectory. Some common examples of projectile motion are the launching of fireworks, a golf ball in the air, meteors entering the Earth's atmosphere, and the firing of bullets.
When an object falls under gravity and has no...
15.8K
Projectile Motion: Example01:18

Projectile Motion: Example

9.9K
The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on...
9.9K
Targets for Drug Action: Overview01:26

Targets for Drug Action: Overview

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Drugs target macromolecules to modify ongoing cellular processes. Primary drug targets include receptors, ion channels, transporters, and enzymes.
Receptors are either membrane-spanning or intracellular proteins, which upon binding a ligand, get activated and transmit the signal downstream to elicit a response. Drugs bind receptors, either mimicking the action of endogenous ligands or blocking the receptor activity to bring about a modified response. Nearly 35% of approved drugs target the G...
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Targeted Cancer Therapies02:57

Targeted Cancer Therapies

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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against...
7.8K
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

260
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
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相关实验视频

Updated: Aug 28, 2025

An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles
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An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles

Published on: August 25, 2020

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移动目标

Kai Kupferschmidt

    Science (New York, N.Y.)
    |September 15, 2022
    PubMed
    概括
    此摘要是机器生成的。

    全球疫疫情为病毒提供了一个独特的机会, 科学家正在调查这些适应是否会导致病毒的更严重或更易传播的形式.

    科学领域:

    • 病毒学
    • 流行病学
    • 公共卫生

    背景情况:

    • 2022年全球麻疹 (麻疹) 爆发标志着一个显著的流行病学转变.
    • 病毒持续的人与人之间的传播带来了新的进化压力.

    研究的目的:

    • 评估mopox病毒适应人类宿主的可能性.
    • 识别可能影响病毒传播或毒性的遗传变化.

    主要方法:

    • 从全球爆发中分离的mopox病毒的基因组监测.
    • 对病毒基因组进行比较分析以检测进化特征.
    • 在模型中预测突变的影响.

    主要成果:

    • 新出现的证据表明, 特定的突变正在mpox病毒基因组中积累.
    • 这些遗传变化可能与人与人传播效率的提高有关.
    • 需要进一步的研究来证实这些突变的功能影响.

    结论:

    • 目前正在发生的mopox疫情为病毒适应提供了关键的窗口.
    • 持续的基因组监测对于追踪mpox病毒行为的潜在变化至关重要.

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    Using Rapid Serial Visual Presentation to Measure Set-Specific Capture, a Consequence of Distraction While Multitasking
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  • 了解病毒演变是通报公共卫生战略和疫情准备的关键.