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Light as Energy01:35

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
Second Law: Motion under Same Force01:10

Second Law: Motion under Same Force

Newton's laws can be applied to bodies at rest and bodies in motion. Newton's first law is applied to bodies in equilibrium, whereas the second law applies to accelerating bodies. To study accelerating bodies, first, the directions and magnitudes of acceleration and the applied forces are determined. Then, the free-body diagram is constructed, and Newton's second law is applied, considering the components of the forces in the x and y directions.
Let's imagine a person is standing on a weighing...
Kinetic Energy - II00:56

Kinetic Energy - II

The kinetic energy of a particle is one-half of the product of the particle’s mass and the square of its speed. Note that just as Newton’s second law can be expressed as either the rate of change of momentum or mass multiplied by the rate of change of velocity, so too can the kinetic energy of a particle be expressed in terms of its mass and momentum, instead of its mass and velocity.
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
Two-Dimensional Force System01:20

Two-Dimensional Force System

A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
Kinetic Energy for a Rigid Body01:13

Kinetic Energy for a Rigid Body

Imagine a solid object involved in a general planar movement, with its center of mass pinpointed at a spot labeled G. The object's kinetic energy relative to an arbitrary point A can be quantified for each of its particles - the ith particle in this case. This measurement is achieved through the employment of the relative velocity definition. The position vector, known as rA, extends from point A to the mass element i.

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相关实验视频

Updated: Jun 28, 2026

Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers
09:45

Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers

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光动力学疗法2.0 的使用方法

Kyungsu Kang1,2, Stefano Bacci3

  • 1Center for Natural Product Systems Biology, Gangneung Institute of Natural Products, Korea Institute of Science and Technology, Gangneung 25451, Gangwon-do, Republic of Korea.

Biomedicines
|November 27, 2024
PubMed
概括
此摘要是机器生成的。

光动力疗法 (PDT) 使用光来激活药物,破坏异常细胞. 这项早期研究探讨了其治疗皮肤疾病的潜力.

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科学领域:

  • 皮肤病学 皮肤病学
  • 在瘤学瘤学.
  • 照相医疗 (photomedicine) 是一种医学.

背景情况:

  • 20世纪初医学研究的历史背景.
  • 在光动力学疗法 (PDT) 的开创性工作由·塔佩纳和Jesionek.

研究的目的:

  • 调查早期光动力学治疗技术的疗效.
  • 探索光激活治疗皮肤病的应用.

主要方法:

  • 早期光动力疗法研究的历史审查.
  • 从1903年开始的案例研究分析.

主要成果:

  • 证明了使用光和光敏感剂来影响组织的可行性.
  • 确定了治疗皮肤病变的潜在应用.

结论:

  • 早期的光动力学疗法显示出针对性组织破坏的前景.
  • 奠定了现代光动力学治疗在皮肤病学中的应用的基础.