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The influence of environmental factors on microorganisms
The life of microorganisms is closely dependent on environmental conditions. Both plants, macroorganisms, and the microworld are significantly affected by various environmental factors. They can be divided into three groups: chemical, physical and biological.
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The influence of environmental factors on microorganisms
- The influence of environmental conditions on microorganisms.
Physical factors. 2. Chemical factors. 3. Biological factors. The external environment is a combination of physical, chemical and biological factors on which all the functions of the organism living in a given environment and its life processes depend. Physical factors. These include: temperature, humidity, pressure, light, radiant energy, the nature of the nutrient medium.
- The influence of microorganisms and environmental factors on the quality of products
Food products containing 30% water or more are a good breeding ground for microorganisms. During propagation, microorganisms secrete enzymes that decompose proteins (proteolytic), fats (lipolytic), carbohydrates (amylolytic) to intermediate or final decomposition products. At the same time, the properties of the products change for the better or for worse. The ability of microorganisms to improve
- Hygienic characteristics of environmental factors
The environment - air, water, soil - has a constant impact on the life of a person, his health, as well as on the composition and safety of food. According to the WHO, public health is influenced by lifestyle (50%), environment (20%), heredity (20%), quality of care (10%). In this regard, hygiene has the following main tasks: • study
- CORRELATION OF GENETIC FACTORS AND ENVIRONMENTAL CONDITIONS IN PATHOLOGY DEVELOPMENT
The facts accumulated to date by medical genetics allow us to present the whole variety of relationships between heredity and the environment in a generalized form. Imagine a situation where the contribution of heredity to the development of a trait, including a pathological one, is zero. This would mean that the trait is completely formed by the external environment, without any involvement of the genotype. In other words, Wednesday
- Lecture IV. BIOLOGICAL FACTORS OF THE EXTERNAL ENVIRONMENT. INFECTIOUS DISEASES
Among the biological factors that are subject to standardization are those that in one way or another can harm the human body. First of all, these are pathogenic (pathogenic) pathogens of an infectious and invasive nature (bacteria, viruses, fungi, helminths, protozoa), their vital products (toxins, enzymes), various allergens, etc. Pathogens act on
- Pathology caused by adverse environmental factors that are inhaled.
Nowadays, the structure of diseases caused by adverse environmental factors has undergone significant changes due to the manifestation of various pathways of xenobiotics into the human body. During evolution, the bulk of toxic products entered the body through the gastrointestinal tract and rendered harmless in the liver. Currently, the majority of foreign products
- LESSON 18 TOPIC. PROFESSIONAL DISEASES. PATHOLOGY CAUSED BY EXTERNAL FACTORS
Motivational characteristic of the topic. Knowledge of topic materials is necessary for their successful mastery in clinical departments. In the practical work of a doctor, this knowledge is necessary for the clinical anatomical analysis of sectional observations and for comparing clinical data with the results of a biopsy study. The general purpose of the lesson. Learn to identify macro - and microscopic signs of acute and
- Water as a factor in the environment, its hygienic and epidemiological significance. Rationing the quality of drinking water
The drinking water supply development program is an integral part of the plan for the socio-economic development of territories within the Russian Federation. Water is essential for sustaining life and it is therefore important to provide consumers with good quality water. As you know, the human body consists of 65% of water and even a slight loss of it leads to serious health conditions. Upon loss
- Atmospheric air as an external environment. The complex effect of meteorological factors on the human body. Meteotropic reactions
Atmospheric air is one of the most important components of human ecology. In the process of his life, a person constantly comes into contact with many factors of the external environment in which he lives, and these factors, of course, have a certain effect on the human body. One of the factors with which a person comes into contact most closely is the air environment. Air
- The value of environmental factors for hardening. Tempering by air, sun and water
Air quenching. Air is the most affordable hardening agent for all children at any time of the year. The use of air for recreational purposes begins with good ventilation of the room in which the children are. A great influence on strengthening the body of children is provided by walks in the fresh air. In the summer, the whole life of children (excluding night sleep) should be transferred to the site. IN
- The influence of environmental factors on the development and survival of eggs and larvae of helminths
Oxygen. It has been established that about 0.0009 cm3 of oxygen is required for the development of Ascafis suilla eggs. Mature A.suilla eggs need less oxygen than developing eggs. Each egg in the process of development requires 0.0000025-0.0000031 cm3 of oxygen. With the cessation of oxygen access, the further development of helminth eggs stops and can continue during aeration. Egg survival
- Soil as an environmental factor. The role of soil in the transmission of epidemic, infectious and parasitic diseases. Soil pollution and self-cleaning
The study of soil, its assessment of various indicators can conditionally be divided into 4 stages. I. The Dopaster period (until 1852). The central point of this period is the localistic theory of Pettenkofer, who believed that all epidemics are closely linked to the mechanical composition of the soil, the content of carbon dioxide and the amount of organic substances. Unaware of infectious agents
- The effect of antimicrobial chemicals on microorganisms
In addition to nutrient chemicals that have a positive effect on microorganisms, there are a number of chemicals that inhibit or completely stop their growth. Chemicals cause either microbicidal (death of microorganisms) or microbostatic effect (they stop their growth, but after removal of this substance, growth resumes again). Nature of action (microbicidal
- Determination of radioactivity of environmental objects and animal products
Purpose of the lesson: To acquire the practical skills of radiation monitoring of environmental objects, meat, secondary products of slaughter of cattle, meat products by express methods of radiometry. Tasks: 1. Learn to take samples of environmental objects 2. Learn the rules of sampling animals and plant products Research objects. Meat and bone of various species of slaughtered animals and poultry;
- Biological pollution of environmental objects as an important hygienic and environmental problem
"The term" biological pollution "covers various biological objects that can have direct or indirect (through environmental objects) adverse effects on human health by inhibiting their natural self-cleaning processes" (G.I. Sidorenko). The main components of biological pollution are: living organisms (macro- and microorganisms) and their products
- Topic: Pathogenicity factors of microorganisms.
Adhesins, pathogenicity enzymes; substances that suppress phagocytosis; microbial toxins. Characterization of pathogenicity factors. Toxigenicity and toxicity of bacteria, protein toxins (exotoxins), classification, basic properties and mechanism of action. Units for measuring the strength of toxins (Dlm, LD50). Endotoxins, chemical composition, properties, mechanism of action. The main differences from protein toxins.
- 3. EXTERNAL FACTORS
The partial pressure of CO2 and O2 in the blood 25-1. Autoregulation of cerebral circulation. Partial pressure of CO2 in arterial blood (PaCO2) is the most important external factor affecting MK. MK is directly proportional to PaCO2 ranging from 20 to ZOmmrt. Art. (Fig. 25-2). The increase in PaCO2 by 1 mm RT. Art. entails an instant increase in MK by 1-2 ml / 100 g / min, a decrease in PaCO2 leads to
- Health effects of the environment
At present, extensive scientific material has been accumulated proving the direct impact of a number of environmental factors (climate, weather, ecological situation) on human health. Based on extensive material, biometrics (a science that studies the dependence of well-being on the weather) has developed a kind of “calendar” of diseases that are characteristic of medium geographical
- Conditionality of growth and development by environmental factors.
The growth and physical development of children is influenced by environmental factors: the state of atmospheric air, the composition of drinking water, the nature of nutrition, the magnitude of solar radiation, etc. The influence of natural environmental factors on the physical development of children is governed by the influence of social living conditions. This was most clearly shown in studies that revealed a decrease in the level of physical
- Mental development of the child: the impact of the environment
The sociologist and ethnopsychologist M. Mead sought to show the leading role of sociocultural factors in the mental development of children. Comparing the characteristics of puberty, the formation of a structure of self-consciousness, self-esteem among representatives of different nationalities, she emphasized the dependence of these processes primarily on cultural traditions, the characteristics of the upbringing and education of children, the dominant style