Effects of light on respiratory metabolism of isolated fruits and vegetables after harvest
The respiratory intensity of fruits and vegetables is affected by many factors such as temperature and gas. It is generally believed that the light intensity has a significant effect on the respiratory metabolism of preharvest fruits and vegetables, but it is still unclear whether it affects the respiratory metabolism of isolated fruits and vegetables after harvest. This experiment compares the changes in respiratory intensity in dark and light conditions between tomato (red), asparagus (green), broccoli (green) and broccoli (white). The results show that the appearance of the color of the tomato is red and The green asparagus and broccoli have different degrees of respiratory intensity after being exposed to light at the same temperature. This suggests that moderate light can reduce the respiratory intensity of these isolated vegetables and delay the respiratory metabolism. This is related to Guo Zhiyi et al. The results of the study on the change of respiration intensity of asparagus in different light conditions are consistent. However, the white broccoli was not affected by the light intensity. At 15°C and 8°C, the respiratory intensity did not decrease significantly after light irradiation, and the respiratory intensity also increased slightly after light irradiation at 0°C. The light intensity can be measured by a light quantum recorder.
The effect of light on the respiration intensity of some isolated fruits and vegetables is also related to the storage temperature. The red tomato and the green asparagus have a significant decrease in respiratory intensity after light exposure at higher temperatures, and under the conditions of near optimal storage temperature, light The decrease in the post-respiratory intensity was small, indicating that the change in the respiratory intensity caused by light at low temperatures was also affected by the temperature. Because the temperature can affect the enzyme activity in the plant, it also affects the physiological role of the plant. Under normal circumstances, an enzyme can only perform normal and rapid reactions at its own temperature. If it exceeds or falls below its optimal temperature, the enzyme's effect will be greatly reduced. As for the temperature measurement, we can use the temperature and humidity self-recording instrument. The temperature and humidity self-recording apparatus is also called a self-reporting temperature and humidity meter and is one of many recorders capable of simultaneously recording temperature and humidity. Proper illumination can reduce the respiratory intensity of isolated vegetables, which has important practical significance for the storage and transportation of fruits and vegetables.
A press brake is a piece of manufacturing equipment that is used to bend sheet metal. A press brake is typically narrow and long so that large pieces of sheet metal can be bent by it. A press brake bends sheet metal by lowering a punch onto sheet metal that has been positioned on top of a die. The metal may be bent several times by a press brake until the desired form has been achieved.
Press brakes can make a variety of different bends on many different types of metals. When setting up a bending process, it is important to consider the metal type being bent, the die, the punch, and the bending force.
The metal type is important to understand because of the differing physical properties among metals. For instance, a high carbon steel will generally be less bendable by a press brake than many aluminum alloys because of the differences in ductility and strength. Metals typically have a recommended minimum bend radius that the material can be bent to without damaging it.
The die and the punch used on the press brake both have a large impact on the bending process. The die is hollow material that the metal is placed on top of prior to bending. It is a very hard and strong material that is near in shape to the desired shape of the metal being bent. The punch is a solid material that is lowered down onto the metal. Since the pressing action of the punch onto the metal and the die are what causes the metal to bend, both shapes must be accurately suited to the bending job. The correct metal shape following a press brake operation is dependent on the size and shape of the punches and dies. The dies and the punches are typically designed in such a way that they can be interchanged easily to accommodate a wide array of jobs.
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