What changes do biological growth belong to?

What changes do biological growth belong to?

What is the change of biological growth? Plants will grow, so will people. We learned in school that the growth of organisms is achieved through changes in cells, but many people forget what this growth change is. Today we will talk about what is the change of biological growth.

What is the change of biological growth? 1 growth: the growth process of an organism from small to large is growth. The growth of multicellular organisms should be considered from two aspects: cell division and cell growth. It refers to the proliferation and increase of cells and the increase of intercellular substances, which is manifested in the increase of the size, length and weight of tissues, organs, various parts of the body and even the whole body, as well as the change of body composition. This is a quantitative change. The proliferation of single-celled organisms has the same relationship. In the field of bacteriology, the increase in the number of individuals is also called growth.

Growth is an extremely complex life phenomenon, and its mystery has not yet been fully revealed. From the physical point of view, growth is the increase of animal body size and weight; Physiologically, it is the proliferation and enlargement of body cells, and the development and function of tissues and organs are becoming more and more perfect; From the biochemical point of view, growth is the accumulation of chemical components, namely protein, fat, minerals and water. From a thermodynamic point of view, growth is the difference between energy input and energy output.

The best growth is that animals have normal growth speed, and adult animals have functional organs. In order to achieve the best growth effect, it is necessary to provide animals with a certain amount of various nutrients and an appropriate proportion of food.

Fattening refers to the rapid deposition of lean meat and fat by intensive feeding of meat livestock and poultry in the late growth stage. The demand for lean meat is increasing day by day. Growth and fattening should not only have a higher growth rate, but also reduce the amount of fat deposition. In order to achieve this goal, the fattening period often limits the excessive weight gain.

However, the early growth and development of breeding livestock and poultry will affect the reproductive performance for life, so it is more important to raise them reasonably and ensure good reproductive conditions.

What changes do biological growth belong to? 2 growth and control 1

1, the definition of microbial growth and reproduction

Microbial growth is a biological process, in which cellular substances increase regularly and irreversibly, resulting in cell volume expansion.

Reproduction is a biological process in which microorganisms grow to a certain stage and produce new living individuals in a specific way due to the replication and reconstruction of cell structure, thus increasing the number of living individuals. In microbiology, reproduction is defined as an increase in the number of cells.

2. How do DNA replication and cell division coordinate in fast-growing bacteria?

DNA replication and cell division control in bacteria are not related, and there are multiple replication fork. In the process of bacterial individual cell growth, chromosomes are constantly copied in a two-way way. Before cell division, not only chromosomes are copied, but also DNA molecules in two subcells are copied.

3. Secondary division of bacteria

In the middle of the length of the bacteria, the plasma membrane invaginates with the insertion of newly synthesized peptidoglycan, which leads to the centripetal growth of the diaphragm, and finally meets at the center, and is divided into two equal-sized daughter bacteria by a bacteria.

4. At a given temperature, the change of each component in bacteria has a single functional relationship with what, and has nothing to do with what?

It is related to the growth rate and has nothing to do with the nutrients in the culture medium.

5. What are the different periods of bacterial population growth? What is the reason?

1, lag period: the number of bacteria does not increase. Reason: (1) Seed aging; (2) The enzyme system adapted to the new environment is not expressed.

2. Logarithmic growth period: maximum growth rate, logarithmic growth and balanced growth.

3. Stable growth period: the growth rate is zero, and the number of living bacteria is the most. Reason: The exhaustion of nutrients, the accumulation of metabolites, pH and other environmental changes make bacteria unsuitable for growth.

4. Decay period: the metabolic activity decreases, and it autolyses with aging. Cause: The nutrients are exhausted and a large number of toxic metabolites are accumulated.

6. Concepts: quorum sensing, generation time, specific growth rate, doubling time and lag time.

Quorum sensing: A way for bacteria to monitor population density by monitoring the concentration of specific signal molecules secreted by cells. This phenomenon is also called self-induction, because the concentration of signal molecules will increase with the increase of bacterial density. After exceeding the threshold, bacteria began to express a series of density-dependent genes (QS), synthesized biofilm, produced strong secondary metabolism, and stopped growing. [Determine the information exchange and differentiation structure between single cells]

Generation time: in the individual growth of bacteria, the time required for each bacteria to divide and reproduce for one generation.

Doubling time: the time required to double the number of bacteria in population growth.

Lag time: the difference between the time required for microorganisms to reach the logarithmic growth period under actual conditions and the time required for microorganisms to reach the logarithmic growth period under ideal conditions (i.e. no lag period) can be obtained by drawing method.

7. Mathematical relationship among generation time, specific growth rate and growth substrate concentration.

Generation time g = 0.693/u; Specific growth rate u = μm×S/(Ks+S)

μm: maximum specific growth rate; S: growth substrate concentration; Matrix concentration when Ks: u is half of μm

8. What is the balanced growth of bacteria?

In the logarithmic growth period, the number of cells increased logarithmically, and the cell composition increased steadily in proportion. It is repeatable.

9. What are chemostat continuous culture and turbidimeter continuous culture? How to carry out continuous training?

Continuous culture in chemostat: keep the flow rate of culture solution constant, so that microorganisms always grow and reproduce below their highest growth rate. Controlling certain essential nutrients at a low concentration is the limiting factor, while other nutrients are excessive. Continuous culture with turbidimeter: constantly adjust the flow rate to keep the turbidity of bacterial culture solution constant. It is usually used for acoustic production of bacteria and metabolites parallel to bacterial growth in fermentation industry.

Continuous culture: A culture method in which microorganisms grow and continue to grow at a constant specific growth rate by constantly supplementing nutrients and removing culture during the whole culture period of microorganisms.

10, how to obtain synchronous cultured cells?

1) Use mechanical methods, such as centrifugation, filtration separation or membrane elution (nitrocellulose filter membrane).

2) Using environmental condition control technology, such as temperature, culture medium composition, obvious physiological cycle, etc.

What is the change of biological growth? 3 the growth law of everything in the world?

Everything in the world is in a number, and the occurrence, development and rise and fall of everything are fixed. Things are always interpreted in an orderly way according to their growth genes and temporal and spatial laws. Plants germinate, germinate, grow leaves, bloom, bear fruit, wither and die, and their seeds have long contained the code of growth program. The conception, formation, birth, growth, prosperity, decline and death of animals also evolved in an orderly manner according to their innate information codes.

There are certain laws or rules in the movement of heaven and earth, the transformation of time and space, the change of environment and climate, the birth and death of everything, and even the biochemical extinction of the earth itself. This law and law all boil down to numbers, and this law and law are fixed numbers. In philosophical terms, this is the "objective regularity" of the development and change of things.

Scientists took a picture of the growth of plants with an infrared camera. In this photo, where the leaf bud grows, there is a complete leaf. Later, this leaf bud gradually grew into a complete leaf. Pick this leaf and compare it with the light and shadow in the photo. In other words, when the leaf bud blooms, what will the leaf bud look like and its size is fixed. This light and shadow is the growth of this leaf bud.

When the leaves grow up, it will take a fixed number of days to turn yellow, wither, float to an orderly place and become soil. Everything is so bound by numbers that it has the fate of biochemical death.

Our sages have long said, "what law is to Yin and Yang is to Shu Shu". In other words, everything originated from Yin and Yang, produced in Yin and Yang, and all coincide with the magic number. "numerology is connected with heaven and earth, and yin and yang will become." Everything is inseparable from yin and yang, and it is inseparable from the number of skills. No yin and yang, no magic, nothing. The Book of Changes studies the yin and yang of heaven and earth. So the Book of Changes is also called Shu Mathematics.

Since everything has a destiny, it is natural, and so is man. The unity of heaven and man, the birth and death of people, of course, can not escape the constraints of numbers. People's birth and growth, "standing at 30, not confused at 40, knowing destiny at 50 ...", as well as flowers, ancient, rare, caves and years old, are all regular and fixed.

Everything has a destiny, such as the group and the individual. As far as people are concerned, everyone's Shou Yuan has his own destiny. The difference in the length of each person's life and the number of years is determined by the information code brought by nature. When a person is reincarnated, the information code brought by nature has been stored in the biological bundle of his soul. When he grew up, the information code in his soul dominated his life process according to his established trajectory.

Therefore, when a person comes to this world at a certain time and in a certain environment, this specific time and space condition has already arranged his life's fortune, so his good fortune and bad fortune, the rich and the poor, and the noble life are all fated.

Why can you know this person's life fortune, good or bad by calculating the four pillars and eight characters? It is precisely because this four-column symbol is the condensation of the time and space conditions when this person was born that it stores the information code that dominates this person's life, which is good or bad. Cracking this password can reveal the established life track of this person.

From this point of view, it is possible, credible and reasonable for easy-to-measure workers to predict a person's life fate according to his four pillars and eight characters, and "four pillars and eight characters prediction" should be reasonable and occupy its scientific position as life information science. Therefore, it is extremely wrong, arbitrary and unreasonable for some people to dismiss "four pillars and eight characters prediction" as feudal superstition. Real scientists should resolutely oppose it.

To put it simply, fortune telling is just a "decoding technique", but this "decoding technique" is not easy to master. Some people don't understand numerology theory and decoding technology, so it's not surprising to denigrate the "four-column eight-character prediction"

To sum up, we can see that people's life span is indeed fixed.