Science

Alexander Popov was born in the Perm province in 1859, on March 4th. He died in St. Petersburg in 1905, on December 31. Popov Alexander Stepanovich - one of the most famous Russian electrical engineers and physicists. Last modified: 2025-01-23 12:01

So who was really the first? Let's try to trace the main milestones on the way to the creation of the first radio. Last modified: 2025-01-23 12:01

A triangle is a polygon with three sides (three corners). Most often, the sides are denoted by small letters, corresponding to the capital letters that denote opposite vertices. In this article, we will get acquainted with the types of these geometric shapes, a theorem that determines what the sum of the angles of a triangle is equal to. Last modified: 2025-01-23 12:01

Method "Classification of objects" - one of the most effective in the field of clinical psychology. With its help, you can identify the presence of deviations in children's development, as well as detect facts of mental deviation in adults. Last modified: 2025-01-23 12:01

Silver is a metal (see photo below), which is one of the rare chemical elements. Most often it is used for making jewelry. Last modified: 2025-06-01 07:06

Jellyfish are a very common and most amazing species of living creatures that inhabit the seas and oceans. They can be admired endlessly. What types of jellyfish are there, where they live, what they look like, read in this article. Last modified: 2025-01-23 12:01

The boundary between the crust and the mantle is called the Mohorovichic surface. The depth of its occurrence is not the same in different regions: under the continental crust it can reach 70 km, under the oceanic - only about 10. The Mohorovichich boundary separates two media with different densities and electrical conductivity. It is generally accepted that this feature reflects the chemical nature of Moho. Last modified: 2025-06-01 07:06

The article is devoted to instruments for measuring noise. The device of such devices, characteristics, as well as manufacturers and user reviews are considered. Last modified: 2025-01-23 12:01

Very often we hear the wrong pronunciation of words. For example, instead of the word "corridor" many people say "kolidor", instead of "stool" - "tubaret", etc. The tasks of orthoepic science just include teaching the classical, competent pronunciation of words. What is this section of science that studies orthoepy? Answers to these and other questions will be provided below. Last modified: 2025-01-23 12:01

In mathematics, inverse functions are functions that "convert" to each other. To understand what this means, it is worth considering a specific example. Let's say we have y=cos(x). If we take the cosine from the argument, then we can find the value of the function. Accordingly, it is necessary to have "x". But what if "game" is initially given, and you want to find x? This is where it gets to the heart of the matter. To solve the problem, the use of an inverse function is required. this is the arcosine. Last modified: 2025-01-23 12:01

The path that Fleming Alexander went through is familiar to every scientist - searches, disappointments, daily work, failures. But a number of accidents that occurred in the life of this man determined not only fate, but also led to discoveries that caused a revolution in medicine. Last modified: 2025-01-23 12:01

In addition to organelles, cells contain cellular inclusions. They can be contained not only in the cytoplasm, but also in some organelles, such as mitochondria and plastids. Last modified: 2025-01-23 12:01

All plants can be divided into spore and seed. Spores include mosses, club mosses, ferns and horsetails. Their life cycle is divided into sporophyte and gametophyte. The sporophyte reproduces asexually by producing spores. The gametophyte is characterized by sexual reproduction, in which the plant forms gametes - sex cells - male and female. Last modified: 2025-01-23 12:01

What are polysaccharides, what are their physical and chemical properties, what functions do they perform in the cell and body?. Last modified: 2025-01-23 12:01

What are alkynes? What physical and chemical properties do they have? Where are they applied? What are the ways to get them?. Last modified: 2025-01-23 12:01

Everyone has seen that in autumn the leaves change their color. This is due to the fact that chloroplasts turn into red, yellow, burgundy plastids. Last modified: 2025-01-23 12:01

In all organisms (with the exception of some viruses), the implementation of genetic material occurs according to the DNA-RNA-protein system. At the first stage, information is rewritten (transcribed) from one nucleic acid to another. The proteins that regulate this process are called transcription factors. Last modified: 2025-06-01 07:06

Today is a time of tremendous change, tremendous progress, as more and more questions are being answered. So in the second half of the twentieth century, it was possible to penetrate the secrets of nature through the study of nucleic acids RNA and DNA. This article is about ribonucleic acid - RNA. Last modified: 2025-01-23 12:01

Transcription in biology is a whole cascade of step-by-step reactions, as a result of which RNA molecules are synthesized on a DNA template. Moreover, not only information ribonucleic acids are formed in this way, but also transport, ribosomal, small nuclear and other. Last modified: 2025-01-23 12:01

In our world, there are pre-nuclear organisms or prokaryotes that do not have a formed nucleus. These organisms are unicellular, and their structure has a number of features with which the prokaryotic cell has adapted to life. Last modified: 2025-01-23 12:01

Such a simple and visual way of solving problems in genetics, like the Punnett lattice, was proposed by English scientists about a hundred years ago. And the method is still used by geneticists all over the world. Last modified: 2025-01-23 12:01

Today we will try to find the answer to the question “Heat transfer is it?..”. In the article, we will consider what this process is, what types of it exist in nature, and also find out what is the relationship between heat transfer and thermodynamics. Last modified: 2025-01-23 12:01

Through DNA, hereditary information is preserved and transmitted from generation to generation with the possibility of variability within certain limits. The synthesis of all proteins necessary for a living system would be impossible without a DNA matrix. We will consider the structure, formation, fundamentals of functioning and the role of DNA in protein biosynthesis. Last modified: 2025-01-23 12:01

From the beginning of time, people have been interested in the composition, structure and interaction of everything that surrounds them. This knowledge is combined into a single science - chemistry. In the article, we will consider what it is, sections of chemistry and the need to study it. Last modified: 2025-01-23 12:01

One of the first groups of multicellular animals - type Coelenterates. Grade 7, which includes a zoology course, examines in detail all the structural features of these amazing creatures. Let's recap what they are. Last modified: 2025-01-23 12:01

The modern taxonomy of animals is huge and diverse, and therefore we need to somehow describe them all, document them, distribute them into groups, and bring them together. And in this case, such a thing as taxa helps us. Last modified: 2025-01-23 12:01

All organisms are made up of cells - the smallest structural and functional units of the structure. But there are also non-cellular forms of life: viruses and bacteriophages. What features of the structure allowed them to occupy their worthy niche among the kingdoms of wildlife? Let's find out more. Last modified: 2025-01-23 12:01

Deoxyribonucleic acid serves as a carrier of hereditary information transmitted by living organisms to the next generations, and a matrix for the construction of proteins and various regulatory factors required by the body. In this article, we will focus on what are the most common forms of DNA structure. We will also pay attention to how these forms are built and in what form DNA resides inside a living cell. Last modified: 2025-01-23 12:01

One of the definitions of life is as follows: "Life is a way of existence of protein bodies." On our planet, without exception, all organisms contain such organic substances as proteins. In this article, simple and complex proteins will be studied, differences in the molecular structure will be determined, and their functions in the cell will be considered. Last modified: 2025-01-23 12:01

Fibrillar proteins - those that have a structure in the form of a thread. They do not dissolve in water and have a very large molecular weight, the structure of which is highly regulatory, it comes to a stable state due to interactions between different chains of polypeptides. These chains are synchronously to each other on the same plane and create the so-called fibrils. Last modified: 2025-01-23 12:01

A famous philosopher once said: "Life is a form of existence of protein bodies." And he was absolutely right, because it is this organic substance that is the basis of most organisms. Quaternary structure protein has the most complex structure and unique properties. Our article will be devoted to him. Last modified: 2025-01-23 12:01

The inquisitive mind never stops and is constantly in search of new information. Modern inventions are a prime example of this. What inventions are familiar to you? Do you know how they influenced the course of history and all of humanity? Today we will try to open the curtain of the mystery of the world of new and relatively recently invented technologies. Last modified: 2025-01-23 12:01

Today, Igor Ivanovich Sikorsky personifies the successful development of the three most important types of modern aircraft. Large four-engine aircraft, giant flying boats and multi-purpose helicopters, which played an important role in the development of aviation, appeared thanks to the genius of the legendary aircraft designer. Last modified: 2025-01-23 12:01

As you know, pH is a unit of hydrogen ion activity, equal to the reciprocal logarithm of the activity of hydrogen ions. Thus, water with a pH of 7 has 10-7 moles per liter of hydrogen ions; and water with a pH of 6 - 10-6 mol per liter. The pH scale can range from 0 to 14. Does pH affect human he alth?. Last modified: 2025-01-23 12:01

Many of us have heard about dominant and recessive genes - some chains of nucleotides hidden in our genome that are responsible for hereditary traits. How do they interact with each other? What is dominance and how does it happen? Why are recessive alleles not always suppressed by dominant ones? These questions have occupied scientists since the discovery of genes. Last modified: 2025-01-23 12:01

Electrolyte solutions are special liquids that are partially or completely in the form of charged particles (ions). The process of splitting molecules into negatively (anions) and positively charged (cations) particles is called electrolytic dissociation. Last modified: 2025-01-23 12:01

The ability to reproduce itself is one of the hallmarks of living organisms. In nature, there are several ways of reproduction that ensure the continuity of generations on the planet. Last modified: 2025-01-23 12:01

What a great variety of forms of political behavior exists! And how few people know about them. And this is not surprising - after all, this topic is studied exclusively by sociologists and political scientists. But knowledge in this case will not interfere with those who wish to directly participate in the life of the country. So, beginner political scientist, let's study the main forms of political behavior. Last modified: 2025-01-23 12:01

The functions of society also include the regulation of relations between individuals, various groups and communities on the basis of acts and provisions of civil law. This allows you to avoid or stop the possibility of conflict situations or resolve them in a civilized legal way. Last modified: 2025-01-23 12:01

Graphology is a science, in the field of view of which there is a connection between a person's handwriting and his character traits. For all its specificity, the use of the basics of graphology is becoming more and more common. Interest in graphology also affected us. Let's figure out what kind of science it is, which can tell the secrets of a person just by his handwriting or a short painting. Last modified: 2025-01-23 12:01