Geometry with mathematics gives us clear criteria by which we can unambiguously determine which object can be considered symmetrical and which is not. However, in addition to boring formulations, there is another parameter that a person singles out almost unmistakably - this is beauty. Last modified: 2023-12-17 05:12
Science 2024, December
The twenty-first century is the time of digital electronics, new technologies and discoveries. Cures have been found for many previously incurable diseases. Skyscrapers have been built that change their shape. Space explored. However, there is still much unknown. For example, the Nazca lines in Peru or the Stone Forest in China, Stonehenge and Easter Island. Which one is the most mysterious place on the planet? No scientist can answer this question. Last modified: 2023-12-17 05:12
The city of Tambov is the administrative center of the Tambov region. This settlement is located 480 km from the capital of Russia. The population of Tambov in 2016 was more than 290 thousand people. Last modified: 2023-12-17 05:12
It is important for a person to understand not only what world he is in, but also how this world arose. Was there anything before the time and space that exists now. How life originated on his home planet, and the planet itself did not appear out of nowhere. The steady state hypothesis excites the minds of many scientists. For two centuries it has been impossible to completely refute it, and maybe not in vain?. Last modified: 2023-12-17 05:12
The chambers of the heart serve as a reservoir for blood and push it into the main vessels. Their walls are strong yet elastic, and the compensatory capacity is large enough to cope with a constant increase in pressure. Last modified: 2023-12-17 05:12
Enzymes can affect the same substrate. However, each of them will accelerate only a specific reaction. Last modified: 2023-12-17 05:12
GIS are modern mobile geoinformation systems that have the ability to display their location on a map. This important property is based on the use of two technologies: geoinformation and global positioning. If the mobile device has a built-in GPS receiver, then with the help of such a device it is possible to determine its location and, consequently, the exact coordinates of the GIS itself. Last modified: 2023-12-17 05:12
Thermal energy is the term we use to describe the level of activity of molecules in an object. Increased excitation, one way or another, is associated with an increase in temperature, while in cold objects, atoms move much more slowly. Examples of heat transfer can be found everywhere - in nature, technology and everyday life. Last modified: 2023-12-17 05:12
Is there a pencil near you? Take a look at its section - it is a regular hexagon or, as it is also called, a hexagon. The section of a nut, the field of hexagonal chess, the crystal lattice of some complex carbon molecules (for example, graphite), a snowflake, honeycombs and other objects also have this shape. Last modified: 2023-12-17 05:12
Ozhegov's Explanatory Dictionary states that a pentagon is a geometric figure bounded by five intersecting straight lines forming five internal angles, as well as any object of a similar shape. If a given polygon has all the same sides and angles, then it is called a regular (pentagon). Last modified: 2023-12-17 05:12
The article talks about what teleportation is, is it possible. Its hypothetical ways of implementation are considered, for which it would be useful. Last modified: 2023-12-17 05:12
At a distance of 2 billion light years from our home is the most powerful and deadly object in our entire universe. A quasar is a dazzling beam of energy that spans several billion kilometers. Scientists cannot fully study this object. Last modified: 2023-12-17 05:12
Everyone has heard that the lizard is able to regenerate a discarded tail. Of course, the higher the organism in the hierarchy, the more difficult are the processes of regeneration in it. It happens at different levels of organization, from cells to the level of tissues; at the level of organs in mammals, regeneration does not occur, but within the framework of one organ it does. The record holder is the liver. So the legend of Prometheus, whose liver was pecked by an eagle, and it grew again overnight, has some real grounds. Last modified: 2023-12-17 05:12
In our article we will consider the circulatory system of mammals, its components and features of functioning. It is essential for all living organisms. This is the implementation of gas exchange, the formation of immunity and the maintenance of homeostasis. What features make such complex functions possible?. Last modified: 2023-12-17 05:12
For all, without exception, multicellular organisms with differentiated tissues and organs, the main condition for their life is the need to transfer oxygen and nutrients to the cells that make up their body. Last modified: 2023-12-17 05:12
Catalase is an enzyme found in almost all living organisms. Its main function is to catalyze the decomposition reaction of hydrogen peroxide to substances harmless to the body. The enzyme catalase is of great importance for the vital activity of cells, as it protects them from destruction by reactive oxygen species. Last modified: 2023-12-17 05:12
The concept of immobilized enzymes first appeared in the second half of the 20th century. Meanwhile, back in 1916, it was found that sucrose sorbed on carbon retained its catalytic activity. In 1953, D. Schleit and N. Grubhofer carried out the first binding of pepsin, amylase, carboxypeptidase with an insoluble carrier. Last modified: 2023-12-17 05:12
The geocentric system of the world is such a concept of the structure of the universe, according to which the central body in the entire Universe is our Earth, and the Sun, Moon, as well as all other stars and planets revolve around it. Last modified: 2023-12-17 05:12
The concept of "evolution" has long been of concern to scientists around the world. Some are trying to connect this term with philosophy, others are trying to finally decide on its biological interpretation. Last modified: 2023-12-17 05:12
Cytology is a science that studies cellular interaction and cell structure, which, in turn, is a fundamental component of any living organism. The methods of modern cytology are widely used in research useful to people, for example, in the study of a cancerous tumor, the cultivation of artificial organs, as well as in breeding, genetics, breeding of new species of animals and plants, and so on. Last modified: 2023-12-17 05:12
Unlike hydrocarbons, oxygen-containing organic substances have a complex of atoms called a functional group. Methanol is a saturated alcohol that has a hydroxyl group in its molecule. It defines the main characteristics of this compound. In our article, we will consider methods for producing methyl alcohol, the most important chemical reactions and the use of methanol. Last modified: 2023-12-17 05:12
At first glance, it seems that modern taxonomy has already identified all the main taxa and has no controversial issues. But that's not the case at all. Have you heard of such a systematic unit as protists? If not, then our article is for you. Last modified: 2023-12-17 05:12
The word "metaphysics" originally meant a collection of works by Aristotle, consisting of 14 books. In them, the ancient Greek philosopher expounded the doctrine of the principles that were the basis of wisdom. Aristotle's metaphysics describes the four highest causes of being and, instead of the triple Platonic structure, offers a dual. Last modified: 2023-12-17 05:12
Amazing animals that lay eggs and feed their young with milk are monotreme mammals. In our article, we will consider the systematics and features of the life of this class. Last modified: 2023-12-17 05:12
The strength of the electric field is its most important quantitative characteristic, which is directly proportional to the force with which this field acts on an external electric charge. Last modified: 2023-12-17 05:12
The main merit of Daniel Bernoulli and other members of the famous family to future generations is to give mathematics the role of a universal tool for research in various branches of science - in physics, chemistry, biology and many others. Last modified: 2023-12-17 05:12
The leading role of energy in the metabolic pathway depends on the process, the essence of which is oxidative phosphorylation. Nutrients are oxidized, thus forming energy that the body stores in the mitochondria of cells as ATP. Last modified: 2023-12-17 05:12
An article answering the question of whether life exists on Mars. The official data on the planet are given, as well as some information about expeditions to Mars and the hypotheses of scientists as to whether there could be life there. Last modified: 2023-12-17 05:12
The average income of an ordinary casino is comparable in size only with the profitability of transactions on Wall Street. Smart people have long understood that you can’t constantly rely on your luck and began to use statistical methods to ensure the stability of your profits. Last modified: 2023-12-17 05:12
Amino acids are organic compounds necessary for the body to synthesize protein molecules. There are 20 essential amino acids that our body needs. Last modified: 2023-12-17 05:12
When studying substances in organic chemistry, more than a dozen different qualitative reactions are used to determine the content of certain compounds. Such a visual analysis allows you to immediately understand whether the necessary substances are present, and if they are not present, you can significantly reduce further experiments to identify them. These reactions include ninhydrin, which is the main one in the visual determination of amino compounds. Last modified: 2023-12-17 05:12
Methods of logistic regression and discriminant analysis are used when it is necessary to differentiate respondents by target categories. In this case, the groups themselves are represented by the levels of one single-variant parameter. Last modified: 2023-12-17 05:12
The Khlopin Radium Institute is part of the state corporation Rosatom. It belongs to the world leaders in the field of studying the problems of nuclear energy. Within its walls, for the first time, they began to study radioactive phenomena, the properties of radioactive materials. Last modified: 2023-12-17 05:12
The Nobel Prize in Chemistry has been awarded since 1901. Its first laureate was Jacob van't Hoff. This scientist received an award for the laws of osmotic pressure and chemical dynamics discovered by him. Last modified: 2023-12-17 05:12
In any habitat, living organisms experience the cumulative effect of various conditions. Abiotic factors, biotic factors and anthropogenic affect the features of their life and adaptation. Last modified: 2023-12-17 05:12
What is heat transfer? How can this method of heat transfer be used? These questions are of practical importance, so we will consider them in more detail. Last modified: 2023-12-17 05:12
The article is devoted to charophytes. The features of plants, the method of their reproduction, taxonomy, etc. are considered. Last modified: 2023-12-17 05:12
Vulnerability - it can be a weak point of a person, in a computer system, a link in a mechanism. Often the word is used in a distorted sense. Last modified: 2023-12-17 05:12
The article describes the compilation of statistical tables, their types, requirements for their components. An algorithm for the rational construction of statistical tables convenient for perception and analysis is presented. Examples of such tables are given. Last modified: 2023-12-17 05:12
The "Cynthia" bacterium never existed in nature. 20 scientific minds worked on its creation under the guidance of Nobel Prize winner S. Hamilton. The artificial bacillus was bred to absorb spilled oil in the oceans, but Cynthia chose to eat fish, animals, and even people. The whole horror is that a deadly bacterium is almost impossible to destroy. Last modified: 2023-12-17 05:12