The food has a blue fluorescence when it is photographed.
There were many reasons for the blue fluorescence of food when photographed. On the one hand, it could be a bioluminescent phenomenon. For example, some shrimps had fluorescent protein in their bodies, which would emit fluorescence under certain conditions. It was like the shrimp in a Thai guy's sushi that emitted blue light under dark light. This might be a similar situation. On the other hand, there might be some substances in the food that reacted with light. For example, after the purple sweet potato was cooked, it would turn blue due to the cyanidins in contact with the acidic water and glow slightly under the light. However, if the food showed this abnormal fluorescence phenomenon, the safety of the food needed to be carefully considered. For example, if a woman felt uncomfortable after eating the braised food bought by the roadside, she would find a color similar to the " fluorescent agent " under the purple light. This situation could be due to hygiene problems or contamination of the food. Read more exciting novels for free
Huawei camera fluorescence
Some of Huawei's phones had a "fluorescent photography" mode, such as the Huawei P50 Pocket phone. It could be used for fluorescent photography because the LED flash on the back of the phone was attached to a lamp bead that emitted ultra-violet light. It was named the " hyperspectral fill light." In a low-light environment, indoors or outdoors, when the " fluorescent photography " mode was turned on, the ultra-violet fill light would work, and the phone would enter the fluorescent photography mode. Due to the low power of the ultraviolet-emitting device, the excited fluorescence was weak, and other light interference might cover up the fluorescence color. When shooting at home, you can use the "single-lamp water bottle box lighting method" to maximize the shooting effect, that is, insert the flower on the glass bottle and put it on the dark box to form a black background, shoot from top to bottom with the phone, and use another LED light to light it. Before shooting, you can also use ordinary lighting to determine the shooting effect, such as using the phone's "automatic mode + reduced exposure compensation" to dim the picture or using professional mode to set the lowest IQ to ensure the quality. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microorganism fluorescence experiment
The following are some common fluorescent experiments: ##I. Microorganism fluorescence in place hybrids 1. ** Backstory ** - It was developed on the basis of in Situ hybrids. The technique was initially used for the analysis of DNA, and later expanded to the field of microorganisms. With the development of fluorescent tagging technology, the use of fluorescent labeled probes for in Situ blotting improved the sensitivity and specialization of detection. 2. ** Principle ** - Based on the principle of complementary base pairing, a specific fluorescent labeled probe was used to carry out a hybrid with the microorganisms in the cells, thereby carrying out qualitative and quantitative detection of the microorganisms. That is, the probe sequence and the sequence of the microorganisms to be tested complement each other to form a stable hybrid double-strand, and then the fluorescent signal is detected by a fluorescent detector to realize the quantitative and positioning analysis of the microorganisms. 3. ** Experiment Method ** - ** sample preparation **: Treat the sample to be tested to separate the microorganisms and maintain their activity. - ** Probe preparation **: Mark specific DNA or R A fragments to form fluorescent probes. - ** Fusion reaction **: Allow the sample and the probe to form a hybrid double-strand under certain conditions. - ** Washing and drying **: Remove the uncombined probes and impurities, and maintain the uniqueness of the hybrid signal. - ** fluorescence detection **: Use a fluorescence detector to detect the fluorescence signal of the sample and process the analysis data. 4. ** Experiment result ** - It can obtain qualitative and quantitative data of samples, has a high success rate, has strong specialization, can clearly detect the existence and quantity of target microorganisms, has high sensitivity, and can detect low copy number microorganisms. 5. ** Experiment Discussion ** - Its advantages include high sensitivity, high sensitivity, and the ability to maintain the integrity of the cell structure. However, there were still some shortcomings, such as the cumbersome preparation of the probe, the high requirements for the hybrid reaction conditions, the expensive fluorescent detection instrument, and the stability of the fluorescent probe may affect the reliability of the results. These factors should be taken into consideration when applying and suitable probes and experimental conditions should be selected. 6. ** conclusion ** - It had a wide application prospect in the research field. In addition to the detection of microorganisms, it could also be used for gene expression analysis, cell death research, etc. Although it was insufficient, it would have more application prospects as the technology developed and optimized. ##2. Experiment based on the ATP-bioluminescent method (related to fluorescence of microorganisms) 1. ** Principle ** - The reaction between the fluorescence and the ATP-containing microorganisms in the sample to be tested will produce fluorescence. The number of microorganisms will be determined according to the intensity of the fluorescence. The ATP-fluorescence detector is designed based on this principle. 2. ** Experimental verification ** - ** Validation of sensitivity **: The fluorescence values measured by the instrument showed obvious differences in the different concentration of the standard solutions of different ATPs, and there was a good linear relationship. The change curve was basically consistent with the change of the concentration of ATPs, which could accurately reflect the change in the number of microorganisms. - ** Verification of ability to deal with different bacteria species **: Test the detection effect of common bacteria species such as E. Coli, Staph. Aureus, and yeast. The equipment can accurately display different bacteria species and different concentration. - ** Test result stability verification **: Two different concentration of ATP-based solutions were selected for 10 tests. Regardless of whether it was a high concentration or a low concentration of ATP-based environment, the deviation of the equipment test results was less than 15%, showing good repetitiveness and stability. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Nikon fluorescence microscope parameters
Take the Nikon E600 Biofluorescence Microscope as an example. Its parameters are as follows: Total Magnification: 10 - 1000X, Observation: 2 - 500X (for 35mm microphotography); with a CFI60 telephoto optical system with a parfocal distance of 60mm; equipped with a three-eye tube; using a Nikon lens; the condensing lens is achromatic with a numerical aperture of 0.9; there are 12V-100W long-life and 6V-30W halo lamps; the objective lens plate is a six-hole objective lens changer and a six-hole DIC objective lens changer; the stage is a super-hard film coated surface; the eyepieces have a magnifying power of 10; 10 times the objective lens; The origin is Japan; The brand is Nikon; The model number was the E600. No processing; Non-cross-border goods. In addition, there was also a Nikon upright microscopic imaging system, which was equipped with 4X, 10X, 20X, 40X, 60X, and 100Xoil lenses, a fully automatic electric stage, a Nikon microscopy-specific color digital CCD', an LED fluorescent light source, and Dapi, Green, and Blue fluorescent filter. It also had Nikon's advanced image analysis and processing software, NSI-Elements AR. It is mainly used for slide sample imaging and supports basic applications such as bright-field, phase contrast, DIC, and multi-channel fluorescence photography. It has a module image processing and analysis system that can automatically take multi-channel fluorescence photos. The fully automatic software controls the lens and channel, field of view, and focal length adjustment. It has the function of big picture stitching and can perform stitching and scanning on tissue samples. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Does jade have fluorescence?
The jade had a fluorescent glow. When the jade was well watered, the light reflected from the bottom after absorbing the essence of heaven and earth was called fluorescence. The curved surface could best reflect the fluorescence, such as the curved surface at the bottom of the egg surface, and the jade would reflect the fluorescence. However, if there were not enough materials, the fluorescence would be divided into weak fluorescence, strong fluorescence, and extremely strong fluorescence. In addition, the polishing powder and wax boiling process used in the jade processing process, as well as a few jades with more impurities (when the impurities were sensitive to the purple light), would also have a fluorescent reaction under the purple light. However, these situations did not necessarily mean that the jade was a BC-grade product. There were also some dyed chalcedony, dyed glass, Lone Dragon Jade, and Sky Blue Ice that were pretending to be jadeites that did not react under the purple light. In professional appraisal, besides looking at the fluorescence, they would also carry out infrared spectrum analysis, density detection, amplification inspection, absorption spectrum, refraction index, and other tests to determine the authenticity of the jade. The novel "Ledge" is equally exciting. Everyone is welcome to click and read it!
Is there a camera that will be photographed?
The camera was an imaging device. Its principle was to convert optical images into electrical signals and then into digital signals, so that the image information could be restored, compressed, and transmitted to other devices for processing and output. However, just because there was a camera did not mean that it would automatically be photographed. The camera needed to meet certain conditions before it could take pictures. For example, it would take pictures when someone activated the camera function (such as pressing the shutter button or operating the camera command in the camera software), or under specific settings (such as setting it to take pictures at a fixed time, automatically monitoring specific situations to take pictures, etc.). In addition, some cameras might be turned off or malfunctioning, and in such cases, they would not take pictures. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What does jade mean by fluorescence?
How to measure the strength of the liquid fluorescence reaction?
The intensity of the fluorescent reaction of the liquid can be measured by direct or indirect methods. ** 1. Direct measurement method ** 1. ** Direct comparison method ** - First, prepare a standard solution and measure its fluorescence intensity as F_x. The concentration of the standard solution is known as C_s. If the fluorescence intensity of the blank solution can be adjusted to zero, the content of the fluorescent substance to be tested in the sample can be calculated according to the comparison of the fluorescence intensity of the standard solution and the sample solution. If the fluorescence intensity of the blank solution cannot be adjusted to zero, the fluorescence intensity of the blank solution must be deducted from the fluorescence intensity of the sample solution and the standard solution. 2. ** Standard curve method ** - After the standard substance with known content was treated in the same way as the sample, a series of standard solutions were prepared and their fluorescence intensity was determined. A standard curve was drawn with the fluorescent intensity versus the fluorescent substance content. Then, the fluorescence intensity of the sample solution was measured, and the content of the fluorescent substance to be measured in the sample was calculated from the standard curve. In order to ensure that the standard curves drawn each time were consistent, the instrument should be corrected with the same standard solution each time. If the solution was unstable under the illumination of the ultra-violet light, another stable standard solution with similar fluorescence peaks should be used for correction. For example, when determining the standard curve of B1, the solution of Quinine Sulphate could be used as the standard correction instrument. ** II. indirect measurement ** 1. ** chemical conversion method ** - For substances that cannot emit fluorescence or have a low fluorescence quantum yield, and the fluorescence is weak and cannot be directly measured, it can be changed into fluorescent substances suitable for measurement through chemical reactions. For example, the reaction of metals and chelators produces fluorescent chelates, and organic compounds can be converted into fluorescent substances through reactions such as biochemical reactions, oxido-reduction, couples, and condensations. 2. ** fluorescence quenching method **(The document does not describe the specific operation of this method in liquid measurement in detail. It only mentions this method). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Being photographed in the library?
Different libraries had different rules. There were some areas in the library that prohibited taking photos because: - "Protection of copyright: Books, journals, and other materials in the library are protected by copyright law. Photographs taken for commercial purposes or shared on the Internet without authorization may violate copyright. - Maintaining the learning environment: The library needs to maintain a quiet and focused atmosphere. Taking photos may arouse the curiosity of others and cause distraction or interference. Moreover, photo equipment (such as flash lights) may also cause interference or discomfort to other readers. - To ensure fair use of resources: Taking photos may cause some people to only take part of the content without personally reading the entire resource, affecting the fair use of resources by others. However, some libraries might hold activities related to taking photos in the library. For example, the Qingchuan Library held the third mobile library's most beautiful library photography competition, which stated that photos could be taken within the scope of their permission. At the same time, in some cases, if the above-mentioned prohibited factors were not involved, such as not taking copyright-protected materials, not affecting other readers, not violating library regulations, etc., they might also be allowed to take photos. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Aliens photographed on Mars
Although there were some suspected aliens on Mars, most of them were proven to be natural phenomena or visual illusions. For example, NASA's Mars probe had captured images of aliens with limbs, a head, and a strange face, but some astronomy believed that their contours and colors were similar to the surrounding environment, possibly formed by natural weathering of rocks. There was also an object similar to a "small door" captured by the Mars rover, which was thought to be a rock fault on Mars, caused by the Mars earthquake, not an entrance to an alien base. Although the presence of methane gas in the Martian atmosphere may be related to the activity of underground microorganisms, there is no conclusive evidence that aliens exist on Mars. The novel "Mars of Paradise" is equally exciting. Everyone is welcome to read it!