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The following is the training content related to the reproduction of microorganisms in water and water quality treatment: * * I. Requirements for the reproduction of microorganisms ** 1. * * Nutrient Source ** - The reproduction of microorganisms required sufficient nutrients such as carbon, nitrogen, and phosphorus. These nutrients were the basis for microorganisms to construct their own cell materials and carry out their metabolism activities. For example, organic matter such as vitamins and protein in sewage could provide nutrients such as carbon and nitrogen sources for microorganisms. 2. * * oxygen content ** - Aerobic microorganisms required sufficient dissolved oxygen. Generally speaking, dissolved oxygen should be maintained at 3 milligrams per liter, and the minimum should not be lower than 2 milligrams per liter. Moreover, shaking cultivation was usually required to ensure an adequate supply of oxygen. - Anerobic microorganisms needed to grow in an anerobic environment, and the dissolved oxygen was required to be below 0.2 milligrams per liter. - The oxygen requirement of faculty-type microorganisms was between the two. They could survive in an environment with dissolved oxygen ranging from 0.2 to 2.0 milligrams per liter and could be cultivated in a stationary manner. 3. * * pH-value ** - Most microorganisms adapt to a range of 4.5 - 9, but different microorganisms have differences. In the case of an aquatic biological treatment, the appropriate ph can be changed between 6.5 - 8.5, and in the case of an aquatic biological treatment, the ph should be between 6.7 - 7.4. For some microorganisms, it was more suitable to control the range of the ph between 7.0 and 9.2. If the pH-value deviated from the appropriate range, it would affect the life activities of microorganisms. For example, when the pH-value was lower than 6.5, fungi might begin to compete with bacteria. When the pH-value reached 4.5, fungi would have a complete advantage in the biochemical pool, which would seriously affect the settling results of the sludge. When the pH-value exceeded 9, the metabolism speed of microorganisms would be hindered. 4. * * Atmospheric temperature ** - In the biological treatment of waste water, the most suitable temperature range for microorganisms is generally 16 - 30 ° C, and the highest temperature is 37 - 43 ° C. When the temperature is lower than 10 ° C, the microorganisms will no longer grow. Within the appropriate temperature range, the metabolism rate of microorganisms would increase correspondingly for every 10 ° C increase in temperature, and the removal rate of chemical oxygen demand (COD-based oxygen demand) would also increase by about 10%. On the contrary, the removal rate of COD-based oxygen demand would decrease by 10% for every 10 ° C decrease in temperature. For some microorganisms, controlling the temperature to 30 - 40 ° C was more conducive to reproduction. 5. * * Light (Part of Microorganisms)** - Microorganisms such as green algae needed to photosynthesize, and light was a necessary condition for their reproduction. * * II. The role of microorganisms in water treatment and related principles ** 1. * * The advantages and role of microorganisms in sewage treatment ** - Microorganisms mainly existed as the decomposing agents in the biosphere, and their greatest value lay in their decomposing function. There were many microorganisms that could degrade polluting substances in natural water and soil. This was also the reason why water and soil had a certain self-purification ability. In sewage treatment, an ecosystem suitable for the growth of microorganisms was artificially created. Energy transfer and material circulation were achieved through the synergy between microorganisms. Microorganisms have the advantages of strong reproductive ability, small shape, large surface area, fast and strong metabolism, wide variety of metabolism products (containing more types and quantities of degrading membranes), large population and wide distribution, strong environmental adaptability (easy to mutate after being affected by environmental factors, able to form a rapid and effective material exchange with the surrounding environment), etc. These advantages make it effective in degrading the pollution in the water. 2. * * Methods and Principles of Microbiological Waste Water Treatment ** - * * Aerobic microorganisms treatment method **: Aerobic microorganisms have strong decomposition and reproduction characteristics, which can quickly break down the complex molecular substances in the water into relatively simple small molecular substances, thus changing the water quality. Under the presence of oxygen, the autotrophs of the nitrating bacteria would vaporize the nitrogen nitrogen (NH-N) to the nitrogen nitrogen of the nitrates (NO-N). This process required the participation of oxygen and had certain requirements for environmental conditions (such as ph, temperature, dissolved oxygen concentration, etc.). - [** Biochemical Treatment Method **: This treatment method is mainly used in high-concentration organic waste water and underwater sludge.] In an airtight environment, the bacteria would break down the organic matter in the waste water into carbon dioxide, methane, and other substances. Under the anoxic-deficient or anoxide-deficient conditions, the detoxifying bacteria used organic matter as an electron donor to reduce the nitrogen of nitrates and nitrates into nitrogen (N <2>), thereby achieving the removal of nitrogen. - * * Microbiological facultive treatment method **: When both good and bad oxygen coexist in the same treatment process, it is facultive treatment. It was found that sometimes the co-existence of both oxygen and oxygen could make the treatment effect better. 3. * * The application of microorganisms in water treatment ** - At present, the market mainly combined a variety of microorganisms with different degrading functions with active biological membranes and nutrient salt, and after industrial production and expansion, they produced live bacteria preparations, namely, microorganisms. Microbiological agents had the advantages of strong uniqueness, high survival rate, fast adaptation to the environment, no secondary pollution, and low cost. They were now widely used in agriculture, petrification, printing and dyeing, food processing, medicine, and environmental protection, especially in water pollution control, soil restoration, and solid waste recycling. 4. * * Microorganisms in the Electro-Biochemical Waste Water Nourishment and Denitration Biochemical System Treatment Technology (example of new technology)** - In the biochemical sewage treatment technology of the biochemical system, by applying a weak electric current, it could stimulate the metabolism activity of microorganisms and improve the decomposition efficiency of microorganisms. The effect of the electric field helped to promote the transfer and spread of substances, making it easier for microorganisms to obtain nutrients, and at the same time, it was also conducive to the discharge of metabolism products. The electric field conditions could selectively promote the growth and reproduction of certain microorganisms with specific functions, optimized the structure of the microorganisms, improved the treatment effect, and helped the transfer of electrons between microorganisms and between microorganisms and microorganisms, accelerating biochemical reactions. * * III. Relationship between microorganisms and water quality indicators ** 1. * * Biochemical oxygen demand (Biochemical oxygen demand)** - The organic matter in the sewage consumed oxygen in both the chemical and biological processes. The more organic matter in the sewage, the more oxygen was consumed. The amount of oxygen consumed by the chemical agent for the sewage was called the chemical oxygen demand, and the amount of oxygen consumed by the microorganisms in the sewage was called the biochemical oxygen demand. The difference between the two could indicate the organic matter in the sewage that could not be biodegraded. In the sewage treatment process, because there were many detection instruments for the determination of oxygen demand and oxygen demand, the detection method was simple, and the test results could be obtained in a short period of time, so they were widely used in water quality detection and analysis. They became an important indicator for water quality monitoring and an important basis for environmental monitoring of water bodies. 2. * * Microorganism and Water Treatment Effect Assessment ** - For example, in the water treatment process of the open circulating water system, the purpose of water treatment was to always control the microorganisms within a certain range (the total number of bacteria was less than 105 CPU/ml). Through the control and detection of the number of microorganisms, the effect of water treatment could be evaluated. If the number of microorganisms exceeded this range, it might cause algae and microorganisms to grow and spread, flow into the terminal equipment, block the equipment, and affect the heat exchange effect. If it was serious, it would cause the heat exchange to be delayed, causing the equipment to be shut down and the risk of stopping production. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Ling Xuan had two possible meanings. One was the name of a specific character in the online novel," The Legend of Ling Xuan." The other was to address her as a mother. The original novel of the TV series " Mo Ran " was Xixing's " Famous Doctor." The original plot was equally exciting. You can click on the link below to read the original novel.

The complex phenomena in biology covered many aspects. From the perspective of the relationship between biological individuals, there were individual relationships, population relationships, and ecosphere relationships. There were also invisible energy flow and information flow relationships. This entire system constituted a highly complex network system. For example, in terms of biological molecules, many important biological molecules had complex heterostructures. DNA molecules not only had a double spiral structure, but also formed complex " knots " under certain circumstances. About 1% of the protein also had this complex knot structure. The oscillation and bistability behavior in biological systems were also complex non-linear phenomena. The oscillation behavior was commonly seen in various biological rhythms, from the metabolism oscillation of cells to the periodic rhythm of biological clocks. There were many complicated situations, such as external periodic stimulation that could lead to the co-existence of multiple oscillation modes. In addition, the variety of organisms was also a complex phenomenon. There were many species of organisms on Earth, and they needed to be classified and studied. This also reflected the complexity of biological phenomena. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The male protagonist in " David Copperfield " could be considered a character that could give people strength. In addition to criticizing cruel realism and exposing decadent capitalists, this work could also be considered a " male inspirational legend." The male protagonist in the book showed his inner strength when he experienced many difficulties and setbacks. This strength came from the maturity of his mind. He continued to grow under the pressure of life and tried his best to resolve all kinds of difficulties. His story could give readers the strength to try to resolve the pressure of life and accept the uneasiness of emotions. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Based on context alone No. The political review needed to fill in his personal information truthfully, including his marital status. Divorce was an actual marital status. If one filled in unmarried during the political review, it would be considered as providing false information and might cause the political review to fail. Moreover, this behavior violated the principle of honesty and credibility and was not allowed in the formal review process. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The difficulty of applying for a postgraduate degree in bioengineering at different universities in the UK varied. University College London Master of Bioengineering requirements include: a bachelor's degree with a GPA of at least 2.1 (or equivalent); a good English level, usually with an IELTS score of 7.0, with no less than 6.5 in any single item; a good bioengineering background with a certain amount of scientific research experience; good research ability, able to independently complete research projects; good communication skills, able to communicate effectively with others; Good computer skills, able to use relevant software for research, good organizational skills, able to effectively manage time and organize research projects. The University of Nottingham Master's degree in Bioengineering was a one-year course. The language requirement was IELTS 6.0 (5.5 points). Imperial College of Technology, Master of Science in Biomedicine Engineering, one year, tuition fee of 35700 pounds per year, starting in October, IELTS 6.5 (Listening 6, Reading 6, Writing 6, Speaking 6), TOEFL 92 (Listening 20, Reading 20, Writing 20, Speaking 20), PTE 62 (Listening 56, Reading 56, Writing 56, Speaking 56). In general, in addition to meeting the basic academic background, English proficiency, and other requirements, different schools may also have requirements for research ability, and the competition between famous schools may be relatively fierce. The difficulty of application is also affected by many factors such as the number of applicants. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The cleanliness of the optical lens assembly workshop was generally between 1,000 to 100,000. The following are the relevant standards for a Class 1000 clean workshop: 1. ** Dust particle count **: The number of dust particles greater than or equal to 0.2 um shall not exceed 237000, the number of dust particles greater than or equal to 0.3 um shall not exceed 102000, the number of dust particles greater than or equal to 0.5 um shall not exceed 35200, the number of dust particles greater than or equal to 1 um shall not exceed 8320, and the number of dust particles greater than or equal to 5 um shall not exceed 293. 2. ** Number of microorganisms **: The number of floating bacteria in each cubic meter should be controlled between 5 to 100, and the number of settling bacteria should be controlled within 1 to 3. 3. ** Requirement for temperature and humidity **: 20 - 22 ° C in winter, 24 - 26 ° C in summer, fluctuation of +/-2 ° C. The humidity of the clean room in winter was controlled at 30 - 50%, and the humidity of the clean room in summer was controlled at 50 - 70%. 4. ** Air exchange rate standard **: The air exchange rate stipulated by the national standard is 50 - 60 breaths/s, while the standard stipulated by the national standard is 25 - 56 breaths/s. 5. ** Fresh air volume and air supply volume standard **: If there are many people in the workshop, the maximum value will be taken. 10 - 30% of the total air supply of the non-unidirectional clean room; the fresh air volume required to compensate for the indoor exhaust and maintain the indoor positive pressure value; to ensure that the fresh air volume per person per hour in the room is greater than or equal to 40m cubic/h. For Class 100,000 clean workshop, the number of air changes shall be no less than 18 times; in terms of temperature and humidity in the engineering design, the temperature shall be greater than 16 ° C in winter and less than 26 ° C in summer, and the humidity shall not exceed 50%; the fresh air replenishment shall be 10% - 30% of the total air supply; the illumination shall not be lower than 300LX; the pressure difference between the main workshop and the adjacent room shall be no less than 10Pa; and the noise shall be no more than 65dBA. Most areas of the dust-free workshop of the camera are 10,000-level, 1,000-level, and some are 100-level. The temperature is 16 - 28 ° C, the humidity is 40% - 70%, and the illumination is 300Lx-350Lx. The changing room and ordinary areas are 200Lx-250Lx. The noise purification area is no more than 62dBA, and the ceiling height is 2.8 - 3m. The pressure difference control clean area is maintained at a positive pressure difference of more than 15Pa compared to the general production area and outdoor. The room with air exhaust in the clean area and the surrounding clean area rooms should maintain a relative negative pressure. The air exhaust in the clean area should be strictly controlled to maintain a positive pressure in the room if the relative pressure of the adjacent room is greater than 5Pa. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is a simple role-playing script with the nine-tailed fox as the theme: [Character: ] 1. [Nine-Tailed Fox (You): Cultivated for a thousand years, has peerless beauty and powerful demonic power, but has experienced love, hatred, love, hatred, and various challenges in the human world.] 2. * * Scholar (Human Male)**: Gentle and refined, full of talent, met Nine-Tailed Fox by chance. [Scene 1: Encounter] [Location: Beside the ancient bridge in the forest] Nine-Tailed Fox (You):(Transforming into human form, dressed in white, standing by the bridge, looking at the flowing water under the bridge) The scenery of this world is quite unique. Scholar: (Passing by with a book basket on his back, he saw you and was attracted by your beauty. He was stunned for a moment.) Why is Miss here alone? Nine-Tailed Fox (You):(Tilting her head slightly, looking at the scholar slyly) I'm playing here and don't want to get lost. Young Master, can you give me some pointers? Scholar: (courteously bowing) Don't panic, Miss. I'm quite familiar with this place. Where do you want to go? * * Scene 2: Knowing each other ** [Location: Scholar's study] (Nine-Tailed Fox and Scholar gradually became familiar with each other. They often met in Scholar's study, and Scholar taught Nine-Tailed Fox how to read and write.) Nine-Tailed Fox (You):(Holding a brush, writing clumsily, accidentally getting some ink) Young Master, this writing is really difficult. Scholar: (holding your hand with a smile, correcting your writing posture) Girl, don't be anxious, just practice more. (Nine-Tailed Fox felt the scholar's warmth and felt a strange emotion in her heart.) [Scene 3: Crisis] [Location: The town's market] (One day, Nine-Tailed Fox and Scholar were playing in the market when a Taoist priest suddenly appeared.) The Taoist priest: (Pointing at the nine-tailed fox, he shouted loudly) Demon, how dare you bewitch people in the human world! Scholar: (Standing in front of Nine-Tailed Fox) Taoist priest, are you mistaken? She's just an ordinary woman. Nine-Tailed Fox (You):(A cold light flashed in her eyes, but she was afraid of hurting the scholar) Young Master, move aside. This is my business. The Taoist priest: (takes out the peach wood sword) Today, I will take you in, you demon fox. [Scene 4: Choice] (In order not to hurt the scholar, Nine-Tailed Fox also did not want to hurt the Taoist priest, because the Taoist priest was also a righteous man, so she decided to leave.) Nine-Tailed Fox (You):(Looking at Scholar affectionately) Young Master, after today, I'm afraid we won't be able to meet again. Take care. Scholar: (I want to catch you, but it's empty) Girl, why? Nine-Tailed Fox (You):(Turning into a white light and disappearing) I don't belong here. Young Master, don't worry about me. This is just a simple role-playing example based on the nine-tailed fox theme. You can modify or expand the plot content as needed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>