This problem is really commonplace. In the daily life, when we see a woman who likes to order some sour food while ordering food, she says with a bad smile: Is it a joy? It seems that sour foods are related to pregnancy.
After pregnancy, the secretion of human chorionic gonadotropin from trophoblast cells inhibits the secretion of gastric acid, which results in a significant reduction in the amount of gastric acid secretion in pregnant women. The activity of various digestive enzymes is greatly reduced, which affects the normal digestive function of pregnant women and causes nausea. Vomiting and loss of appetite and other symptoms. At this time, as long as you eat sour food, these symptoms will be relieved. Why is this? Because the acid can stimulate the secretory glands, promote gastric secretion, increase the activity of digestive enzymes, promote gastrointestinal motility, and increase appetite, is conducive to the digestion and absorption of food. At the same time, fetal development, especially skeletal development, requires a large amount of mineral calcium, but calcium salts must be deposited to form bones without the help of sour foods. In addition, sour foods can promote the absorption of iron in the intestine and benefit both mother and child. Therefore, it is good for the body to eat proper sour food after pregnancy.
In addition, some medical experts have investigated that there is no difference in the secretion of chorionic gonadotropin when pregnant with a girl. Therefore, there is no scientific basis for folks to spread the so-called "sweet and hot girls."
Sour food recommended for pregnant women in winter: Apple
Also, when cooking, try to develop the sour food, which is often added with tomato, and the natural sour mouth, such as tomato fish soup, is sour. There are citrus, hawthorn, cherries, grapes, bayberry and sour fruits that are the best choice for pregnant women.
Tips: Pregnant women must strictly select sour foods, because not all sour foods are suitable for pregnant women. Such as artificial pickled sauerkraut, nitrite composition, vinegar products, although delicious, should try not to eat or eat less.
Everything You Need To Know About LED Lighting
LEDs are a simple invention with huge potential to change the lighting industry for the better. Don`t know much about them? Here are three big things you need to know to get your feet under you:
1.What Does LED Stand For?
2.LED stands for light-emitting diode.
A diode is an electrical device or component with two electrodes (an anode and a cathode) through which electricity flows - characteristically in only one direction (in through the anode and out through the cathode). Diodes are generally made from semi-conductive materials such as silicon or selenium - substances that conduct electricity in some circumstances and not in others (e.g. at certain voltages, current levels, or light intensities).
2.A light-emitting diode is a semiconductor device that emits visible light when an electrical current passes through it. It is essentially the opposite of a photo-voltaic cell (a device that converts visible light into electrical current).
Did You Know? There is a similar device to an LED called an IRED (Infrared Emitting Diode). Instead of visible light, IRED devices emit IR energy when electrical current is run through them.
1.How Do LED Lights Work?
2.It`s really simple actually, and very cheap to produce, which is why there was so much excitement when LED lights were first invented!
The p-type and n-type materials are created by introducing the original material to atoms of another element. These new atoms replace some of the previously existing atoms and in so doing, alter the physical and chemical structure. The p-type materials are created using elements (such as boron) that have less valence electrons than the intrinsic material (oftentimes silicon). The n-type materials are created using elements (such as phosphorus) that have more valence electrons that the intrinsic material (oftentimes silicon). The net effect is the creation of a p-n junction with interesting and useful properties for electronic applications. What those properties are exactly depends mostly on the external voltage applied to the circuit (if any) and the direction of current (i.e. which side, the p-type or the n-type, is connected to the positive terminal and which is connected to the negative terminal).
Application of the Technical Details to LED Lighting:
When a light-emitting diode (LED) has a voltage source connected with the positive side on the anode and the negative side on the cathode, current will flow (and light will be emitted, a condition known as forward bias). If the positive and negative ends of the voltage source were inversely connected (positive to the cathode and negative to the anode), current would not flow (a condition known as reverse bias). Forward bias allows current to flow through the LED and in so doing, emits light. Reverse bias prevents current from flowing through the LED (at least up until a certain point where it is unable to keep the current at bay - known as the peak inverse voltage - a point that if reached, will irreversibly damage the device).
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