What are the conditions for the growth of microorganisms?
The conditions for the growth of microorganisms were as follows: ** 1. Nutrients ** 1. ** organic substances **: For example, energy-rich organic substances such as plant root secretions can promote the growth and activity of microorganisms. In the early stage of fermentation, microorganisms need nutrients such as sugar, protein, and vitamins for reproduction. 2. ** Concentration of specific nutrients **: The concentration of nutrients in the medium affects the growth of microorganisms. The depletion of certain basic nutrients may stop the growth. Even if other nutrients are abundant, the exhausted nutrients can only be replenished to restart the growth. ** 2. Type of oxygen requirement ** 1. ** Aerobic type **: This type of microorganisms uses oxygen as an electron receptor for metabolism. Without oxygen, they cannot exist. 2. ** Anerobic type **: oxygen suppresses the life and survival of the anerobic microorganisms. They use non-oxygen substances such as nitrates and sulphates as electron receptors. 3. [Facultative-oxygen type: Able to live normally under both oxygen and anoxia conditions. Usually, growth is better and material utilization is more adequate when there is oxygen.] ** 3. Water and temperature ** 1. ** Water **: The water potential that is most suitable for the growth of higher plants (-70 - -10 kPa) is suitable for the growth of microorganisms. Too much water will limit the oxygen supply. 2. ** Temperatures **: Different microorganisms have different suitable temperature ranges. For example, many microorganisms are suitable for growth at 20 - 30°C. In the biological treatment of waste water, the suitable temperature for microorganisms is generally 16 - 30°C, and the highest is 37 - 43°C. It will not grow below 10°C. Within the appropriate range, the metabolism rate of microorganisms increased for every 10°C higher temperature, and decreased for every 10°C lower temperature. ** 4. Acid and Alkalinity ** The growth of microorganisms was affected by the change of the cell membrane's penetrability, membrane structure stability, and the absorption of nutrients, which in turn affected the growth rate. Each kind of microorganisms had a range of suitable growth pH. Most natural environments had a pH5 - 9, which was suitable for most microorganisms to grow. Only a few microorganisms could grow in environments with pH2 or pH10. ** 5. Exchangeable calcium and pH.(For soil microorganisms)** Exchangeable calcium and pH determine whether a particular soil organism can survive in a particular soil. ** 6. Light intensity (targeted at algae microorganisms)** Light intensity had a particularly important effect on the growth of algae microorganisms. ** VII. Concentration of organic and mineral substances (for some microorganisms)** Some microorganisms are affected by the concentration of SiO2, NO2- N, NH2- N, HCO2- N, PO3-N, Mn, and Fe3, as well as the concentration of organic substances such as COD3 or BOD3. The concentration multiple of circulating water also affects some microorganisms. Read more exciting novels for free
The law and application of the growth curve of microorganisms
The growth curve of microorganisms was a curve drawn by inoculating a small amount of bacteria into a certain volume of suitable fresh culture medium and cultivating it under suitable conditions. The curve was drawn with the log of the number of bacteria as the ordinate and the growth time as the abyssal coordinate. According to the growth rate, it could be divided into the delay phase, exponential phase, stable phase, and decline phase. Rules: - During the delay period, the number of bacteria did not increase for a short period of time. - The number of bacteria in the log phase increased rapidly. - The number of bacteria in the stable phase was stable. - The number of bacteria in the decline phase gradually decreased. The length of the four stages varied with the genetics of the strain, the amount of inoculations, and the cultivation conditions. In terms of application: - In scientific research, by measuring the growth curve of microorganisms, one could understand the growth law of each bacteria. - It also had important guiding significance in production. For example, in the agricultural field, it can be used to prevent pests and diseases and reduce the use of chemical pesticides, such as the use of spores and fungi to prevent soil-borne diseases. In the food industry, it can extend the shelf life of food and prevent food spoilage. For example, the organic acid produced by the yogurt bacteria suppresses the growth of spoilage bacteria, and natamin is used for food preservation and freshness preservation. In the field of medicine, the antimycrotics from microorganisms play an important role. Probiotic bacteria can regulate the balance of the intestinal flora and suppress the growth of harmful bacteria. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is a growth factor oversynthesis type of microorganisms?
Growth factor over-synthesizing microorganisms referred to microorganisms that could synthesize and secrete a large amount of growth factors such as certain vitamins during their metabolism. For example, Eupatorium ashu could synthesize B2, Propionidium scheigeri could synthesize B12, and Dunaliella salina could synthesize beta-Carotenin. These microorganisms were all growth factor over-synthesizing microorganisms. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The principle of measuring the growth of microorganisms by weight method is as follows:
The principle of measuring the growth of microorganisms by gravity method was as follows: First, the bacteria were separated from the medium by centrifugal or filtering method, washed and weighed wet or dry weight; Second, the weight of microorganisms was calculated according to the protein content of the bacteria in the sample. This was based on the stability of the protein content of microorganisms and that nitrogen was a stable component of the protein (protein content = 6.25× total N content). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microorganisms are non-cellular microorganisms
Microorganisms that are non-cellular include viruses, viruses, and prions. Viruses were composed of a long chain of DNA and a protein shell. Nucleic acid was just one of the types of DNA or R A. It was parasitic on animal cells or plant cells, and its replication, replication, and translation were all completed in the host cells. Phages were viruses that were parasitic on bacteria, and their forms were tadpole-shaped, microsphere-shaped, and rod-shaped. Prions were actually infectious protein, and they were the pathogen of animal and human infectious cavernous brain diseases. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The words of microorganisms
" Microorganisms " could be " microorganism " or " microorganism ", or " microorganism " or " pathogen microorganisms ". <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microorganisms or Immunity
Microorganisms were closely related to immunity. Microorganisms play an indispensable role in the development and function of the immune system. Animal genomes alone could not build a mature immune system. The participation of microorganisms was necessary. In the early stages of development, microorganisms can influence the immune system to create a complete immune cell type, and can also help the development of immune organs that store these cells. When the immune system was built and started working, the microorganisms continued to help adjust its response to external threats. From the perspective of inflammation, microorganisms could stimulate immune cells to trigger inflammation and induce anti-inflammatory cells, thus balancing the immune response of the human body and preventing continuous infection due to insufficient inflammation or excessive immune response, which would lead to inflammation and autoimmunity diseases such as asthma and inflammation. For example, the protein A on the surface of Bacteroides frailis could repair the immune system of sterile mice, restore the number of helper T cells, and prevent diseases caused by excessive immune system reactions such as inflammation and multiple stiffen. At the same time, the relationship between microorganisms and immunity was also reflected in the immunity of microorganisms. For example, in the deep sea environment, it was found that bacteria and archaea, two very different microorganisms, were immune to the same virus. This phenomenon indicated that there might be complex interactions between microorganisms that affected immunity, and symbiotic microorganisms might improve their ability to fight viruses through horizontal transfer of immunity. In addition, the inhibition of microorganisms was also related to immunity. The metabolism produced by some microorganisms or by virtue of their own characteristics inhibited the growth of other microorganisms. This process also indirectly affected the interaction between the immune system and microorganisms. For example, in the agricultural field, the use of spores and fungi to prevent soil-borne diseases, and in the food industry, the use of yogurt bacteria and natamin to prevent food spoilage. In the field of medicine, the use of microbial-derived antibiotics and probiotic regulation of the balance of the intestinal flora to suppress the growth of harmful bacteria were all manifestations of the phenomenon of microorganisms in different fields. These were all related to immunity to varying degrees. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The role of microorganisms
" The role of microorganisms " was translated as " microscopic action " or " the role of microorganisms " or " the function of microorganisms." <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microorganisms in volcanic soil
The microorganisms in volcanic soil had many characteristics. Some studies had shown that there were obvious spatial differences in the structure and function of the microorganisms in volcanic soil. For example, in the Nushan volcano in Anhui Province, there were significant differences in the richness, structure, and function of the microorganisms in the nematosphere of Ramie in the volcanic environment. Compared with the volcanic cone, the fungi in the crater showed higher richness, variety, and even degree. The volcanic soil's digestive activity played a key role in shaping the variety of microorganisms. and further affect the functionality of the microorganisms planted in the root of the Ramie. The soil samples collected from different altitudes in the crater of Nushan Volcano were found to have a peak in the middle of the crater. The network analysis showed that the bacteria and fungi communities were the most stable at the bottom and top of the crater, respectively. The soil microorganisms network showed a trend of first decreasing and then increasing at different altitudes. The core microorganisms determined by the redundant analysis and the association analysis had the highest association with the pH and AP, and the number of core microorganisms in the fungi community was higher. The core microorganisms of bacteria were more sensitive to environmental factors. There were many types of microorganisms living in volcanic soil, including bacteria, fungi, algae, protozoa, viruses, nematodes, and other common soil microorganisms. In addition, there were also some extreme microorganisms that could survive in extreme environments such as volcanoes. Some extreme microorganisms fed on sulfur and did not need any light. Some could even absorb radioactive uranium waste and use it as energy. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Vessel for submitting microorganisms
Different types of microorganisms had different requirements for the containers. For blood samples for general biochemical tests, if it was an item that required non-coagulated blood, the specified amount of blood should be injected into a clean and dry test tube. For items that required coagulated blood, a specific coagulated tube should be used according to the requirements, and the specified amount of blood should be injected and shaken well. For anti-pollution projects, attention should be paid to sterile operations when collecting specimens. Some of them even had to be operated in an airtight environment. When collecting specimens for clinical microbiology test, the specimens should be placed in sterile containers. The containers must be sterilized by physical methods such as high-pressure sterilization, boiling, dry heat, or using disposable sterile containers. Disinfection agents or acid treatments should not be used. As for the pathogenic microorganisms sample submission box, the outer container is a hard plastic container made of PE, and the second layer is a sealed container made of pet material. It is equipped with an incubator, absorption material, label, 95 kilopascal sealed tank, cold storage material, electronic temperature display, etc. It is suitable for the road transportation of biological samples, pathogenic microorganisms (viruses), blood, vaccine, etc. of UN2814, UN2900 and UN3373. For environmental soil samples, the common soil samples were taken in 1.5 - 50ml centrifugal tubes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Egg Pathogenic Microorganisms
The most common pathogenic organism in eggs was salmonella-like bacteria. Salmonella is a common diet-borne pathogen that can survive inside and on the surface of eggs. In addition, the source of infection in the scattered yellow eggs may also be the bacteria, micrococci, pseudospores, spores, mold, or parasite eggs. If infected with salmonella-like bacteria, people with strong immunity would have abdominal pain, diarrhea, nausea, vomiting, and other symptoms in a short period of time. For pregnant women, children, and the elderly with low immunity, once infected, it could be life-threatening. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>