Author: Zhang Meng Ran Release Date: 2019-02-20 According to a medical paper published by the British journal Nature Communications on the 19th, a team of European scientists reported that a natural compound has been identified to protect yeast, worms and human cultured cells, helping to delay aging. This is another important discovery of humans in the development of anti-aging drug therapy. Aging can cause specific changes in cells, and most methods known to extend lifespan activate cell autophagy. Autophagy is a recycling mechanism that can remove and degrade damaged proteins and organelles in cells, and generate new molecules for synthesis. Autophagy dysfunction causes toxic or damaged molecules to accumulate in cells, leading to age-related lesions, such as neurodegenerative diseases. This time, Frank Mehto, a scientist at the University of Graz in Austria, and his colleagues screened flavonoids with anti-aging effects in yeast cells, a class of plant-derived molecules known to promote cell health. The team found that the naturally occurring 4,4'-dimethoxychalcone (DMC) in a plant leaf called "Tomorrow Leaf" not only prolongs the lifespan of yeast, worms and fruit flies, but also reduces Age-related cell decline in human cultured cells. DMC protects mouse heart cells from long-term myocardial ischemia (reduced cardiac blood flow) and reduces tissue death. The researchers also found that DMC's protective efficacy requires the activation of autophagy, a systemic change in metabolism that is conserved across all species. This observation also confirms that autophagy has a conserved effect on cell protection and longevity, an advancement in the development of anti-aging drug therapies. However, whether the therapy can prevent age-related decline in the human body still needs further study. (Reporter Zhang Mengran) Source: Technology Daily
What is DVR Mini Camera
Dvr, which is called DigitalVideoRecorder in full, is a digital video recorder. Compared with traditional analog video recorders, dvr uses hard disk for recording, so it is often called hard disk recorder, also called DVR. It is a set of computer system for image computing, storage and processing. It has the functions of long-time video recording, recording, remote monitoring and control of images/voice and dynamic frames. DVR integrates five functions, including video recorder, picture splitter, PTZ lens control, alarm control, and network transmission. One device can replace a large number of devices in the analog monitoring system, Moreover, it has gradually gained advantages and popularity in terms of price.
The function of DVR, with the increase of various voltage sensitive loads in the distribution network, puts forward higher requirements for power quality. However, due to system accidents in the power system, the voltage flicker, drop and other disturbances caused by the startup and shutdown of large equipment, lightning stroke and other principles are unavoidable. Moreover, in the current power grid, the ability to quickly restore power supply after power interruption is far from meeting the requirements of many sensitive loads. Therefore, it is necessary to provide users with stable and uninterrupted high-quality power when interference occurs. Dynamic voltage recovery (DVR) is the choice to solve the above problems today. DVR is connected in series to the feeder line that requires high-quality power to realize dynamic real-time voltage compensation for the line, so that the load end can get the desired high-quality power, and ensure the normal and uninterrupted operation of sensitive user equipment.
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The "digitalization" of DVR means that compression and storage technology is aimed at digital signals, rather than directly transmitting digitally encoded video images. Therefore, DVR must be deployed near the analog camera.