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相关概念视频

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Ureters01:22

Ureters

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The ureters are retroperitoneal tubes located on either side of the vertebral column. They are responsible for transporting urine from each kidney to the urinary bladder. These tubes have thick walls and are approximately 25-30 cm long. Their diameter is around 10 mm at the renal pelvis, gradually narrowing to 1 mm as the ureter obliquely enters the posterior bladder wall through the ureteric orifices. The shape of these orifices is slit-like, which helps to prevent urine backflow toward the...
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Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Urethra01:16

Urethra

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The urethra is a hollowed tubular organ through which urine is expelled from the body. This structure extends from the bladder to the external opening, allowing urine to be released.
The anatomy of the urethra differs between males and females. In females, the urethra is short, measuring about 3–4 cm in length, and opens anterior to the vaginal opening. In males, the urethra is longer and passes through the penis, serving dual purposes: expelling urine and ejaculating semen. The male...
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Blinding01:11

Blinding

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Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
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相关实验视频

Updated: Jun 24, 2025

Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation

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这无声的UVA.

Sérgio Schalka1, Marcelo de Paula Correa2

  • 1Medcin Skin Research Center, São Paulo, Brazil.

Journal of photochemistry and photobiology. B, Biology
|June 1, 2024
PubMed
概括

大多数防晒提供对紫外线A (UVA) 辐射的弱保护,导致显著的"无声UVA"暴露. 开发具有增强UVA保护的防晒对于更好的皮肤健康至关重要.

科学领域:

  • 皮肤病学 皮肤病学
  • 摄影生物学 摄影生物学
  • 化品科学 化品科学

背景情况:

  • 紫外线A (UVA) 辐射对皮肤的有害影响已被广泛记录.
  • 传统的防晒主要针对UVB保护,不太重视UVA.
  • 当前市场上的防晒通常在UVB和UVA保护水平上表现出显著的差异.

研究的目的:

  • 分析商业可用的防晒的传输特征.
  • 从理论上计算和量化用户对UVA辐射的暴露.
  • 引入和定义"无声UVA"暴露的概念.

主要方法:

  • 对三种不同的防晒产品的传输光谱进行分析.
  • 理论计算以估计基于传输数据的UVA暴露.
  • 关于紫外线影响和防晒有效性的文献综述.

主要成果:

  • 商业防晒显示不充分的UVA阻能力.
  • 用户接触到大量的紫外线辐射,称为"无声紫外线".
  • 在目前的防晒配方中,UVB和UVA保护之间存在很大的差距.

结论:

关键词:
皮肤老化 皮肤老化皮肤癌是一种皮肤癌.防晒剂是一种防晒剂.紫外线是一种紫外线.

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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet VUV Synchrotron Radiation

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High-Speed Ultraviolet Photoacoustic Microscopy for Histological Imaging with Virtual-Staining assisted by Deep Learning
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  • 人们迫切需要具有更好的UVA保护的防晒.
  • 减少"无声UVA"暴露对于预防长期皮肤损伤至关重要.
  • 应该开发出新一代具有更高UVA功效的防晒.