Microbiological limit bacteria original record
The original record of the bacteria in the limit of microorganisms usually contains the following contents: - Basic information, such as product name, batch number, inspection date, report date, inspection basis, room temperature, relative humidity, etc. - Test article preparation: including the sample size (g or ml), the disinfection time of the ultraviolet-light lamp, the method used (such as the conventional method, the heat-preservation shaking method, the mortar method, etc.), and the amount of sterile buffer solution of pH7.0 added (ml). - Bacteriological examination: The batch number of nutrient agarmedium, incubation temperature, incubator model, observation results at different time periods (24 hours, 48 hours, 72 hours, etc.), plate number records (including multiple plate numbers such as 10 - 1, 10 - 2, 10 - 3, etc., as well as negative control plate number), and finally the average result (cfu/g). Read more exciting novels for free
Medical Device Microbiological Limit Test
The following are some questions that may be involved in the microscopic limits of medical devices: ** 1. Fill in the blanks ** 1. Microbiological limit test and sterile test should be carried out in a one-way air flow area with an environmental cleanliness (Class 10,000) and a local cleanliness (Class 100). 2. Unless otherwise specified, in the method for the detection of the limit of microorganisms, the incubation temperature is (30 - 35 ° C) and the incubation time is (2 - 3 days) for bacteria; the incubation temperature is (20 - 25 ° C) and the incubation time is (3 - 5 days) for mold and yeast; the incubation temperature is (35 - 37 ° C) and the incubation time is (18 - 24 hours) for restricted bacteria. 3. Unless otherwise specified, the test volume of the test article is (10g or 10ml); the film is (100cm <2>); the test volume of (precious drugs) and (micro-packaged drugs) can be reduced. The test volume of salmonella-like bacteria was (10g or 10ml) or (20g or 20ml). 4. During the test, the test article should be taken from (2) or more of the smallest packaging units, and the film agent should not be less than (4) pieces. Generally, the test article should be (randomly) taken at least (3) times the amount used for the test. 5. The number of passages of the test strain should not exceed (5) generations. The freeze-dried bacteria obtained from the bacteria preservation center was the (0) generation. If the bacteria solution is stored at room temperature after preparation, it should be used within 2 hours. If it is stored at 2 - 8 ° C, it can be used within 24 hours. 6. The methods to eliminate the suppressive activity of the test article were (Dilutation Method),(Separation Method),(Membrane Filteration Method), and (Neutralization Method). 7. The pore size of the membrane used in the membrane filtering method should not be greater than (0.45) um, and the diameter is generally 50 mm. If rinsing liquid is needed to rinse the filter membrane, the rinsing volume of each filter membrane is (100ml). The total rinsing volume should not exceed 500ml. ** 2. Short Answer Questions ** 1. Explain the significance of the microscopic limit test for medical devices. - Microbiological limit testing of medical devices is of great significance to ensure the safety and effectiveness of medical devices. During the production, storage, and use of medical devices, the contamination of microorganisms may cause infection risks to patients and affect the performance of medical devices, such as causing inflammation of the tissues around the implanted medical devices and causing functional failures of medical devices used externally. The number and types of microorganisms in medical devices can be limited and monitored through the microscopic limit test to ensure that they meet the corresponding quality standards, thereby protecting patients from being infected by microorganisms and improving the quality and reliability of medical devices. 2. For different types of medical devices (e.g., implanted, in contact with blood, in contact with the surface of the human body, etc.), what are the differences in the requirements for the limits of microorganisms? - For the sterile medical devices implanted and inserted into the blood vessels and the sterile medical devices that need to undergo subsequent processing (such as filling and sealing) in the local Class 100 clean room (area) under Class 10,000 or the accessories that are delivered from the factory with single packaging, the final cleaning, assembly, primary packaging and sealing production area and the processing and production area of the parts that have not been cleaned shall not be lower than Class 10,000 cleanliness level. The requirements for the limit of microorganisms shall be extremely strict. This was to prevent the introduction of microorganisms into the human body's blood vessels and other key parts, causing serious infection. - For the sterile medical devices or single-package accessories that are in direct or indirect contact with blood, bone marrow cavity or unnatural cavity, the production area for final cleaning, assembly, primary packaging and sealing, as well as the processing and production area for parts that have not been cleaned shall not be lower than Class 100,000 cleanliness level. The requirements for the limit of microorganisms shall also be relatively high, because blood and the like are good environments for the growth and reproduction of microorganisms. Once the microorganisms exceed the standard, it may cause serious diseases such as blood infection. - For the sterile medical devices or single-package accessories that come into contact with the damaged surface and mucus membrane of the human body, the final cleaning, assembly, primary packaging, sealing production area and the processing and production area of the parts that have not been cleaned shall not be lower than Class 300,000 cleanliness level. The requirements for the limit of microorganisms are slightly more relaxed than the former two, but the number of microorganisms still needs to be controlled to prevent infection on the damaged surface and mucus membrane of the human body. 3. Please explain how to prevent contamination during the test for the microscopic limit of medical devices. - In terms of personnel, all personnel working in the clean room (area) should receive regular training in basic knowledge of hygiene and microbiology, cleaning operations, etc. Personnel entering the clean room (area) should be purified according to the procedures, and wear work hats, masks, clean work clothes, and work shoes. The operator who touches the product with bare hands should disinfect his hands again at a certain interval, and the type of disinfectant for bare hands should be changed regularly. At the same time, health requirements for personnel should be formulated and personnel health files should be established. Personnel who have direct contact with materials and products should have a physical examination at least once a year. Personnel with infectious diseases and infectious diseases should not engage in work that has direct contact with products. - In terms of factories and facilities, the production process in the clean room (area) of the corresponding level should be determined according to the quality requirements of the sterile medical devices produced. The clean room (area) should be reasonably arranged according to the production process of sterile medical devices and the required air cleanliness level. The flow of people and logistics should be reasonable. The production operations in the same clean room (area) or adjacent clean rooms (areas) shall not cross-contaminate each other. The temperature and relative humidity of the clean room (area) should be compatible with the production process requirements of the product. The layout of the pipes and air intakes into the clean room (area) should be reasonable. The connection between the water, electricity and gas transmission lines and the wall should be securely sealed, and the lighting lamps should not be hung. The operating table in the clean room (area) should be smooth, flat, free of dust particles and fibers, not easy to accumulate dust, and easy to clean and disinfect. The production plant shall be equipped with dust-proof facilities to prevent insects and other animals from entering. The doors, windows, and safety doors of the clean room (area) should be sealed. The doors of the clean room (area) should be opened in the direction of high cleanliness. The inner surface of the clean room (area) should be easy to clean and not be affected by cleaning and disinfection. No floor drain is allowed in the Class 100 clean room (area). In other clean rooms (areas), the sink or floor drain should be properly designed and maintained, and installed with a device that is easy to clean and has an air blocking function to prevent reverse flow. The connection with the external drainage system should be able to prevent the invasion of microorganisms. - In terms of testing operations, it was necessary to strictly follow the sterile operation specifications, use sterilized Detection Tools and reagents, and operate in a specified clean environment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microbiological Rotavirus
Rotavirus (RV) was a double-stranded DNA virus belonging to the Reovirus family, the Rotavirus family. It was named after its wheel-shaped structure. Rotavirus was divided into 10 groups (A-J groups), of which group A could infect humans and most mammals, and was the most common pathogen of acute gastroenteritis (diarrhea) in children <5 years old; group B was generally susceptible to adults, mainly infected young adults; group C was mainly infected with children, and occasionally adults. Rotavirus is mainly transmitted through the digestive tract, respiratory tract, breast milk, iatrogenic, placenta, human-animal and other channels. The incubation period is generally 1 - 3 days, and the amount of detoxification is the most after 3 - 4 days of illness. Children are more susceptible than adults. Their immunity is short after the disease and they can be infected repeatedly. Rotavirus diarrhea had various clinical types, involving the digestive system, circulating blood system, respiratory system, central nervous system, and kidney damage. The symptoms ranged from subclinical infection and mild diarrhea to severe dehydration and solute imbalance. There was no specific drug to treat Rotavirus gastroenteritis, and it was mainly targeted at the treatment of diarrhea and dehydration. In terms of prevention, comprehensive preventive measures were mainly taken to cut off the transmission route, such as paying attention to personal hygiene, washing hands before meals, avoiding close contact with patients with acute gastroenteritis or diarrhea, and disinfecting baby toys and personal utensils regularly. Vaccination was also considered to be an effective means to reduce the infection of Rotavirus. China had imported oral penta virus vaccine (3 doses, starting at 6 - 12 weeks of age after birth, with an interval of 4 - 10 weeks between each dose, and completed within 32 weeks of age) and domestic oral monocratic Rotavirus vaccine (suitable for babies between 2 months and 3 years of age, 1 dose per year) to choose from. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
PhD in Microbiological Engineering
The China Academy of Sciences, the Institute of Bioenergy and Bioprocess, is recruiting a post-graduate in the field of fermentation engineering. The employment department was the Microorganism Manufacturing Engineering Center, and the position was the career establishment. The required majors included biology, chemical engineering and technology, light industry technology and engineering, etc. His job responsibilities were to develop and scale up the fermentation process, as well as process multi-group analysis. The requirements are as follows: Doctorate degree in fermentation engineering, microbiology, light industry technology and engineering or other related disciplines; experience in optimization of fermentation process and multi-group analysis, familiar with optimization of fermentation process system and engineering scale-up; experience in fermentation of thread-like fungi or other thread-like fungi is preferred; experience in operating a ton fermentor or working experience in related enterprises is preferred. Age: 35 years old. The registration method is other. Please refer to the main text for the deadline. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Materials for Microbiological Isotopes
The following are some of the materials for the discussion of microorganisms: ** I. The application of microorganisms in the study of microorganisms metabolism ** 1. ** Principles of Metabolic Research ** - Many elements, such as carbon (C), nitrogen (N), sulfur (S), and iron (Fei), are involved in the metabolism of microorganisms. When microorganisms process these elements, they cause a change in the nuclei, and scientists can detect these changes in the rock records. For example, in order to study ancient microorganisms on Earth, astrobiologists searched for the fingerprint of the nuclei in the rocks to determine the metabolism of the ancient community. 2. ** Instance ** - In the study of oceanic biochemical autotrophs, the use of the technique was introduced into the classic dilute method (such as the original "innovative dilute method" of the State Key Laboratory of Marine environmental science at the University of Fujian), which solved the difficult problem of determining the feeding rate of the polluting microorganisms in the ocean. Through the tagging and tracking of the nuclei, the metabolism process of the microorganisms and their interactions in the ecosystem could be determined, such as the feeding rate of the microorganisms. 3. ** The influence of microorganisms on elemental circulation and deposit ** - Microbes help to control the deposit and circulation of these elements in the environment, thus affecting the local and global geological and chemical levels. For example, microorganisms played an important role in the Earth's carbon cycle. Their metabolism of carbon would affect the distribution of carbon neutrons. By studying the changes of carbon neutrons, one could further understand the role of microorganisms in the biochemical cycle. ** II. The application of microorganisms in tracing the history of microorganisms ** 1. ** The challenges and methods of studying ancient microorganisms ** - Microorganisms did not leave behind large fossils such as bones and shells like large organisms, so studying the history of microorganisms was challenging. Isotopes were an important tool for the study of ancient microorganisms. For example, the rocks along the shores of Lake Salda in Turkey were formed by microorganisms absorbing minerals in the water for a long time. By analyzing the changes in these rocks, scientists could understand the metabolism of microorganisms in the past. 2. ** Combining genetics and radioactive evidence to study evolution ** - Another way to study ancient microscopic life is to trace the evolutionary information contained in the genetics of life today. Combining genetic information from molecular biology with biological information from the rock records (of which the information about the nuclei was an important part) would help to understand the link between the early Earth and the co-evolution of early life. For example, the formation of banded iron layers (BIFs) on the ancient seabed (3.8 billion to 1.8 billion years ago) was related to some of the oldest rock formations on Earth. Their high iron content was red, reflecting that the Earth's oceans were rich in iron at that time. Microorganisms would cause an elemental change during the metabolism of iron, which was important for tracing the survival and evolution of microorganisms at that time. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microbiological Transcription factors
Microbiological factors play a key role in many physiological processes of microorganisms. In plant microorganisms, there are many kinds of transcriptions factors such as bZIPs, corn O2, thaliana PosF21, wheat and rice HBG- 1, etc. In terms of microorganisms 'response to environmental changes, the role of transcriptions could not be ignored. Microorganisms needed to respond to environmental changes at the level of gene translation, which was crucial for their energy utilization, toxicity regulation, evolution direction, and even industrial applications. For example, in E. Coli, the increase in the level of the cellular signaling molecules cCamp can activate the cCamp receptor protein (CPR) to bind to the target DNA, regulating more than 7% of the global gene replication level. This process involves catabolite repression, which allows bacteria to switch to other non-glucose carbon sources as energy sources in an environment lacking glucose. Moreover, CPR is closely related to the environmental adaptability of microorganisms, involving group sensing and the acquisition of metal ions in the cell. pathogenic bacteria and mobility. Transcription factor (TF) could be used as a tool to modify the metabolism pathway of microorganisms. It had the advantages of "multi-point regulation" and dynamic regulation, which could regulate the target metabolism pathway in a global, efficient, and specific manner. The review systematically summarized the types and principles of action of the transcriptions factors. It also systematically introduced and compared the prediction methods of different species, different types of transcriptions factors and their DNA binding sites. In addition, it also summarized the application of global transcriptional regulation technology, the application of transcription-factor-based biosensors, the application of artificially constructed transcription-factors, and other examples. It also proposed the problems and solutions faced by the application of transcription-factor regulation tools in the application of microorganisms in recent years from six aspects, including the modification of DNA binding site specific, the modification of DNA binding site position and binding ability, the regulation of the response spectrum and dynamic regulation range of induced transcription-factors. Group response tools, optimization strategies, and strategies to couple the factors with other control elements. Transcription factors also play a role in the process of microorganisms and immunity. For example, the strong immune response caused by immune cells to gut microorganisms is usually dominated by immune cells that express the lineage-specific transcription factor ROR�t. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microbiological evolution, general variety
There might be a trillion 'species' of microorganisms in total, more than 100 times that of humans, and 100,000 times that of larger 'macro' species. A large part of the world of microorganisms exists in environments that are difficult to access, rare, or extreme. Some or all parts of the microbiome may be increasing rapidly, which means that investigations may never be able to keep up with this dynamic process. Although a new species of bird or beetle would only appear every few thousand years, or suddenly appear during rare geological changes, countless new microorganisms appeared every day. The evolution of microorganisms did not stop because of the emergence of animals and plants. They rapidly evolved to adapt to the new environment provided by humans, such as deep soil, human intestines, sewers, and other new environments. Establishing and maintaining a baseline library of the sequences of the nuclei (DNA and R A) of certain species of microorganisms was also a challenge. The first was to focus on what regulated and promoted the evolution of microorganisms, and the other was to study how to use a single molecular or cell to assess the variation within a species. Although assessing the pace and direction of change in the variety of microorganisms is challenging, it is not impossible. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
History of Microbiological Biochemical Testing
Based on context alone Microbiological biochemical testing had a long history of development. In the early days, the study of microorganisms was mainly focused on morphological observation. As the study of the physiological functions of microorganisms deepened, people began to explore the biochemical characteristics of microorganisms. At the end of the 19th century, microbiologists gradually realized that microorganisms would produce specific biochemical reactions during metabolism, which became the beginning of biochemical testing of microorganisms. In the 20th century, with the development of chemical analysis technology and equipment, the biochemical test technology of microorganisms had made great progress. For example, by detecting biochemical indicators such as the ability of microorganisms to ferment sugar and decompose protein, they could more accurately identify different types of microorganisms. Various biochemical test methods were emerging, such as sugar fermentation test, indoles test, hydrogen sulfureted test, etc. These traditional biochemical tests had become an important means of identification of microorganisms. With the development of molecular biology technology, the biochemical test of microorganisms was further expanded and deepened on the original basis. On the one hand, new biochemical indicators were constantly discovered, which improved the accuracy and resolution of the identification of microorganisms. On the other hand, automated biochemical analysis instruments for microorganisms began to appear, which greatly improved the detection efficiency, making the biochemical test of microorganisms play an irreplaceable role in many fields such as medicine, food, and the environment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Contribution of Microbiological Laboratory Personnel
Microbiological laboratory personnel made important contributions in many aspects: In the diagnosis of infectious diseases, microbiologists were like "hunters" looking for accurate medication evidence. For example, in the face of patients infected with rare bacteria (cyanogen Marneffei) like Xiao Xi, the microbiology laboratory staff relied on their own professional knowledge and experience to accurately diagnose, so that the clinicians could adjust the treatment plan to allow the patient to recover. Their work was crucial for the accurate diagnosis of infectious diseases and could determine the life and death of the patient to a certain extent. In terms of improving their professional abilities, some of the staff participated in the "micro-training program" to improve their abilities, thereby improving the quality of their work in the microbiology laboratory, such as regulating specimen submission, improving the withdrawal system, improving the quality of specimens, analyzing the monitoring data of bacteria resistance to solve problems, and strengthening the communication between the laboratory and the clinic. In the fight against the new crown pneumonia-like epidemic, the microbiology laboratory personnel of the Center for Disease Control and prevention are responsible for the screening of the new crown virus in groups such as suspected patients, close contacts, high-risk groups and returning to work. They had to do the tedious preparation work from receiving samples, extracting the DNA, configuration of the amplification system, amplification to reporting the results. They had to repeat this process many times a day. They were not afraid of the difficulty of working under protective clothing, regardless of the risk of infection and physical discomfort (such as blurred vision, body marks, dizziness, etc.), working day and night to contribute to the control of the epidemic. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Microbiological decomposition produces carbon dioxide
Microorganisms can produce carbon dioxide by degrading substances in a variety of ways. For example, in the purification technology of microorganisms, the metabolism of microorganisms (bacteria, fungi, protozoa, etc.) could degrade the foul odor into harmless substances such as carbon dioxide, water vapor, NO3 -, SO42-, etc. During this process, the microorganisms obtained energy to maintain their own organisms and reproduction. The fully bio-degrading mulch film is made of bio-degrading materials. It can be completely decomposed by bacteria and microorganisms within 1 - 2 plant growth cycles, and finally form carbon dioxide and water. In the process of biochemistry, the respirometer test can be used for the microorganisms. The solid waste sample is placed into a container containing microorganisms and soil, and then the mixture is inflated. The microorganisms will gradually digest the sample and produce carbon dioxide, and the amount of carbon dioxide produced can be used as an indicator of decomposition. In addition, the decomposition of animal and plant carcasses by microorganisms would also release carbon dioxide. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Usage Method of Microbiological Agent in Qingmanyuan
The application method of the microorganisms in Qingmanyuan was as follows: - [Spray: 300 - 500 times (600 - 1000 pounds of water).] - Spray and apply: 1000ml mixed with 10 - 30kg of water. It can be used to clear the garden of pests and diseases, and to prevent branch diseases. When clearing the fruit trees, the first time after the leaves fall, you can use Qingmanyuan + avermentin to kill the eggs; the second time after the branches are trimmed, you can use Qingmanyuan to kill the bacteria and repair the wounds. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>