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Color vision of bats

03.04.2010

After studying the retinas of two species of bats from Central and South America, German physiologists came to the conclusion that these bats can distinguish colors.

Cones are found in the retina - cells that work only in good light and allow you to see color. There are two types of them: perceiving yellow-green color and sensitive to ultraviolet. The latter are needed to search for food - flowers with nectar (many flowers glow brightly with reflected light in the ultraviolet range).

The proportion of color-sensitive cells in the retina of bats is less than 4% (in humans, approximately 5,3%).

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Latest news of science and technology, new electronics:

The existence of an entropy rule for quantum entanglement has been proven 09.05.2024

Quantum mechanics continues to amaze us with its mysterious phenomena and unexpected discoveries. Recently, Bartosz Regula from the RIKEN Center for Quantum Computing and Ludovico Lamy from the University of Amsterdam presented a new discovery that concerns quantum entanglement and its relation to entropy. Quantum entanglement plays an important role in modern quantum information science and technology. However, the complexity of its structure makes understanding and managing it challenging. Regulus and Lamy's discovery shows that quantum entanglement follows an entropy rule similar to that for classical systems. This discovery opens new perspectives in the field of quantum information science and technology, deepening our understanding of quantum entanglement and its connection to thermodynamics. The results of the study indicate the possibility of reversibility of entanglement transformations, which could greatly simplify their use in various quantum technologies. Opening a new rule ... >>

Mini air conditioner Sony Reon Pocket 5 09.05.2024

Summer is a time for relaxation and travel, but often the heat can turn this time into an unbearable torment. Meet a new product from Sony - the Reon Pocket 5 mini-air conditioner, which promises to make summer more comfortable for its users. Sony has introduced a unique device - the Reon Pocket 5 mini-conditioner, which provides body cooling on hot days. With it, users can enjoy coolness anytime, anywhere by simply wearing it around their neck. This mini air conditioner is equipped with automatic adjustment of operating modes, as well as temperature and humidity sensors. Thanks to innovative technologies, Reon Pocket 5 adjusts its operation depending on the user's activity and environmental conditions. Users can easily adjust the temperature using a dedicated mobile app connected via Bluetooth. Additionally, specially designed T-shirts and shorts are available for convenience, to which a mini air conditioner can be attached. The device can oh ... >>

Energy from space for Starship 08.05.2024

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New method for creating powerful batteries 08.05.2024

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Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Random news from the Archive

Photonic chip converting waves with high efficiency 27.04.2021

American scientists have created a photonic chip capable of effectively changing the frequency of the incoming signal and amplifying it at the output using nonlinear optical effects.

Coherent frequency conversion has many applications in the field of classical and quantum information transmission, visualization and detection. This process is crucial for the connection between classical and quantum devices - as a result of it, the frequency of the signal changes, but the initial phase and envelope of the wave remain the same.

The authors of the new study have created photonic chips that can efficiently convert incoming frequencies using non-linear optical effects. Photonic devices were chosen for a reason - they consume low power, scale well and have a small size. In addition, optical effects that are not available for other platforms are possible in such chips.

Physicists have presented a new circuit for highly efficient frequency conversion on a photonic chip. When generating the sum frequency - a non-linear optical process that can convert the frequency of the incoming signal - the device uses only the phase matching condition for the two modes. This significantly increases the speed and reduces the complexity of the process.

Experiments have shown that the highest efficiency was observed for converting a signal with a frequency of 1560 nanometers into a wave with a frequency of 780 nanometers. The efficiency rate was 42% - higher than for many modern devices. By creating cascade optical effects in the chip, the authors were able to increase this value to almost 100%.

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