Drug acts as Trojan horse to kill cancer cells
A light-activated drug that can enter and kill cancer and bacterial cells without harming nearby healthy cells has been tested successfully in zebrafish and cells.
Jun 1, 2021
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A light-activated drug that can enter and kill cancer and bacterial cells without harming nearby healthy cells has been tested successfully in zebrafish and cells.
Jun 1, 2021
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146
The time most of us spend looking at a screen has rapidly increased over the past decade. If we're not at work on the computer, we're likely to stay tuned into the online sphere via a smart phone or tablet. Shelves of books ...
Oct 19, 2012
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The damaging effects of daily, lifelong exposure to the blue light emanating from phones, computers and household fixtures worsen as a person ages, new research by Oregon State University suggests.
Jul 27, 2022
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Optogenetics, a tool for controlling neurons with light, has given neuroscientists the ability to flip brain cells on and off more or less at will, revolutionizing neuroscience.
Dec 19, 2019
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Imagine the brain as a giant switchboard covered with thousands of buttons, knobs, dials and levers that control aspects of our thought, emotions, behavior, and memory. (You can think of the movie Inside Out, if you like.)
Mar 23, 2022
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Few people realize that upon leaving the dentist's office, their new filling, implant, or other dental restoration is already under attack by millions of oral bacteria.
May 3, 2019
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You may remember when US President Donald Trump suggested exposing coronavirus patients to UV (ultraviolet) light—or "just very powerful light"—to help treat them.
Jul 15, 2020
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Can non-functioning photoreceptors be detected like dead pixels on a camera sensor? Until now this has not been possible, but a new technique will allow fast and non-invasive assessment of the physiological state of the retina. ...
May 24, 2022
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For patients with solid cancers, endoscopic surgery is one of the primary treatment options to remove tumors. However, there is a high risk of cancer recurrence if even a small number of cancerous cells are left behind after ...
May 26, 2023
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Biomedical engineers, cell biologists and neuroscientists at Duke University and the Albert Einstein College of Medicine have developed a new type of genetically encoded neural biosensor that operates in near-infrared light.
Oct 27, 2020
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The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 380 to 750 nm. In terms of frequency, this corresponds to a band in the vicinity of 790–400 terahertz. A light-adapted eye generally has its maximum sensitivity at around 555 nm (540 THz), in the green region of the optical spectrum (see: luminosity function). The spectrum does not, however, contain all the colors that the human eyes and brain can distinguish. Unsaturated colors such as pink, and purple colors such as magenta are absent, for example, because they can only be made by a mix of multiple wavelengths.
Visible wavelengths also pass through the "optical window," the region of the electromagnetic spectrum that passes largely unattenuated through the Earth's atmosphere. (Blue light scatters more than red light, which is why the sky appears blue.) The human eye's response is defined by subjective testing (see CIE), but atmospheric windows are defined by physical measurement.
The "visible window" is so called because it overlaps the human visible response spectrum. The near infrared (NIR) windows lie just out of human response window, and the Medium Wavelength IR (MWIR) and Long Wavelength or Far Infrared (LWIR or FIR) are far beyond the human response region.
Many species can see wavelengths that fall outside the "visible spectrum". Bees and many other insects can see light in the ultraviolet, which helps them find nectar in flowers. Plant species that depend on insect pollination may owe reproductive success to their appearance in ultraviolet light, rather than how colorful they appear to us. Birds too can see into the ultraviolet (300-400 nm), and some have sex-dependent markings on their plumage, which are only visible in the ultraviolet range.
This text uses material from Wikipedia, licensed under CC BY-SA