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One interesting characteristic of the simple harmonic motion (SHM) of an object attached to a spring is that the angular frequency, and the period and frequency of the motion, depend only on the mass and the force constant of the spring, and not on other factors such as the amplitude of the motion or initial conditions. We can use the equations of motion and Newton's second law to find the angular frequency, frequency, and period.
Consider a block on a spring on a frictionless surface. There...
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01:21EPS and iPS Cells in Disease Research
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03:20The Stanford Prison Experiment
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The famous and controversial Stanford Prison Experiment, conducted by social psychologist Philip Zimbardo and his colleagues at Stanford University, demonstrated the power of social roles, social norms, and scripts.
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01:26Photochemical Electrocyclic Reactions: Stereochemistry
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
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01:17Thermal Electrocyclic Reactions: Stereochemistry
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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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中央货币交易所-欧洲货币交易所春季研讨会十周年
1Science and Technology Facilities Council, Research Complex at Harwell, Didcot OX11 0FA, United Kingdom.
Acta crystallographica. Section D, Structural biology
|December 1, 2025
概括
作为冷电子显微镜 (cryoEM) 的一个关键活动,CPC-EM春季研讨会在过去十年里显著增长. 对第十版的分析揭示了详细的社区人口统计和活动扩张.
科学领域:
- 结构生物学 结构生物学
- 生物物理学的生物物理.
- 生物化学 生物化学
背景情况:
- CCP-EM春季研讨会是冷电子显微镜 (cryoEM) 社区的年度会议.
- 它作为一个平台来介绍和讨论最新的方法进步和应用在cryoEM.
研究的目的:
- 描述CCP-EM春季研讨会的前十年.
- 量化事件在十年中的增长.
- 为第十届研讨会提供人口统计数据的详细细分.
主要方法:
- 描述性分析十年的事件增长.
- 对第十届大会参会者的人口统计分析.
主要成果:
- 研讨会在其十年的历史中经历了显著的增长.
- 从第十版收集和分析了详细的人口统计数据.
结论:
- 中共-EM春季研讨会成功促进了社区的增长和对冷EM的参与.
- 人口分析提供了关于冷EM场不断变化的组成的见解.
