Science

A cell in biology is a living structure enclosed in a membrane and containing organelles. This is the elementary unit of all living things, combined from organic and inorganic molecules. All organisms except viruses are made up of cells. Last modified: 2025-01-23 12:01

The body is an amazing collection of organs and tissues that work together to maintain human life. And the main process that supports life is metabolism. As a result of the breakdown of substances, the energy necessary for the flow of basic biological processes is synthesized. However, along with energy, potentially harmful metabolic products are also formed. They must be removed from the cell, interstitial fluid and blood by the kidneys. Last modified: 2025-01-23 12:01

In biological systems, the balance is maintained due to the existence of food chains. Each organism takes its place in them, receiving organic molecules for its growth and reproduction. At the same time, the process of splitting complex substances into elementary ones that can be assimilated by any cell is called dissimilation. In biology, this is the basis for the existence of living organisms, along with assimilation. Last modified: 2025-01-23 12:01

In the northern hemisphere of the night sky, 166 stars can be seen with the naked eye, which organize the constellation Pegasus. Next to him are Aquarius, Dolphin, Andromeda, Chanterelles, Pisces, Lizard, Small Horse and Swan. The area occupied by this cluster of stars is 1120 square degrees. Last modified: 2025-01-23 12:01

What is numismatics - definition, history and stages of development. In this article, you can learn the benefits of numismatics, as a science, about the purpose and origin of coins. Data on valuable coins of Russia since 2000 and their value. Last modified: 2025-06-01 07:06

Features of the bottom of the Pacific Ocean - here you can read about depressions, underwater volcanic ridges, seamounts. Pacific Ocean - relief features and amazing facts. Last modified: 2025-01-23 12:01

The evolutionary process of absolutely any living species on our planet went through both the stages of flourishing and increasing the number of its populations, and reducing the number of specimens to several thousand, hundreds or less. In the latter case, it is customary to speak of the bottleneck effect. Let's take a closer look at what this means. Last modified: 2025-01-23 12:01

In recent years, the school system has undergone significant changes. The Education Act gave schools the right to implement new, modernized curricula. Reforming the school involves changing educational programs, obtaining education in accordance with the inclinations and abilities of students. School textbooks are changing, institutions of a new type are being opened everywhere. We can say that modern schoolchildren had a chance to live in an interesting time of change. Last modified: 2025-01-23 12:01

Methodological doctrine has a lot of characteristic features. In addition, it is simply necessary for any existing science. The article will give basic information about the methodology and its types in different sciences. Last modified: 2025-01-23 12:01

Propylene is a typical representative of the class of unsaturated hydrocarbons. Consider its main characteristics, let us dwell in more detail on the polymerization reaction. Last modified: 2025-01-23 12:01

When talking about the characteristics of a voltaic arc, it is worth mentioning that it has a lower voltage than a glow discharge and relies on thermionic radiation of electrons from the electrodes that support the arc. In English-speaking countries, the term is considered archaic and obsolete. Last modified: 2025-01-23 12:01

This article will consider the topography of the femoral canal. Between the pelvic bones and the inguinal ligament, a person has a special space, which is divided into muscular and vascular lacunae through the iliac crest ligament. The first is located outside and is the place through which the femoral nerve and iliopsoas muscle pass to the thigh. Last modified: 2025-01-23 12:01

The belief that man is not alone in the universe pushes thousands of scientists to research. Is the existence of parallel worlds real? Evidence based on mathematical and physical laws, unexplained facts of history confirm the existence of other dimensions. Last modified: 2025-01-23 12:01

The material contains a historical description of the experiments of Evangelista Torricelli. Their practical significance is explained. Last modified: 2025-01-23 12:01

The Van de Graaff generator was invented at the beginning of the twentieth century. It was used for various purposes, in particular, for nuclear research. Later, the use narrowed. Today you can buy it as a toy and demonstrate to children the levitation of various objects. You can also build a generator yourself. Then it will become an excellent training model with which various experiments are carried out. Last modified: 2025-01-23 12:01

We are used to the fact that our favorite luminary gives us warmth and light, helps to grow crops, heats water in lakes, rivers and seas. But besides this, the energy of the sun's rays can be used in other ways. Last modified: 2025-01-23 12:01

The respiratory system of birds is unique. In birds, air flows only in one direction, which is not characteristic of other vertebrates. Last modified: 2025-01-23 12:01

A time series is a set of quantitative values of one or another indicator, taken over a certain time period. The formation of each level of this series is influenced by many factors, both short-term and long-term. Last modified: 2025-01-23 12:01

Any innovative project has a certain structure, sequence of implementation. Consider this question in more detail. Last modified: 2025-01-23 12:01

From low temperatures, close to absolute zero, to high temperatures that are needed for the synthesis of atomic nuclei - this is the range of many years of activity of Academician Kapitsa. He twice became a Hero of Socialist Labor, and also received the Stalin and Nobel Prizes. Last modified: 2025-01-23 12:01

Successful financial activity of any organization is unthinkable without in-depth analysis and forecasting. Therefore, these issues are given special attention. Various methods and coefficients are used for the study. Last modified: 2025-06-01 07:06

In our article we will consider what pure substances and mixtures are, methods for separating mixtures. Each of us uses them in everyday life. Do pure substances occur in nature at all? And how to distinguish them from mixtures? Let's figure it out together. Last modified: 2025-01-23 12:01

Probably there is no person who does not know the name James Joel. The discoveries of this physicist are used all over the world. What path did the scientist take? What discoveries did he make?. Last modified: 2025-01-23 12:01

The article tells about the polarization of society. It tells in detail about the meaning of the term, the history of the term, as well as the main problems of modern social polarization. The types of polarization of society are also described in detail. Last modified: 2025-01-23 12:01

In order for parts and mechanisms to serve for a long time and reliably, the materials from which they are made must meet the necessary working conditions. That is why it is important to control the permissible values of their main mechanical parameters. Mechanical properties include hardness, strength, impact strength, ductility. The hardness of metals is a primary structural characteristic. Last modified: 2025-06-01 07:06

Molecular mass is expressed as the sum of the masses of the atoms that make up the molecule of a substance. Usually it is expressed in a.u.m., (atomic mass units), sometimes also called d alton and denoted by D. For 1 a.m.u. Today, 1/12 of the mass of C12 of a carbon atom is accepted, which in units of mass is 1.66057.10-27 kg. Last modified: 2025-01-23 12:01

Ethics, or moral philosophy, is a branch of philosophy that includes the systematization, defense and development of the concepts of right and wrong behavior. The field of ethics, along with aesthetics, relates to questions of value and, thus, includes a branch of philosophy called "axiology". Last modified: 2025-01-23 12:01

In the era of Peter's reforms, much has changed in Russia. The increased intensity of people's activities has given rise to qualitatively new approaches to the perception of what is happening. The picture of the world was changing, there was a tendency for the development of a different culture in society. Last modified: 2025-01-23 12:01

Snakes are animals with a long, narrow and flexible body. They do not have legs, paws, arms, wings or fins. There is only a head, body and tail. But does a snake have a skeleton? Let's find out how the body of these reptiles works. Last modified: 2025-01-23 12:01

What is the main sequence of stars? How are the luminaries of this category similar to the Sun, what is their structure? Read in the article. Last modified: 2025-06-01 07:06

About Russia, as the largest country in the world, many people know. They know that the capital is Moscow, the main river is the Volga, and the president is Putin. But there is information about Russia that is not known to everyone. Last modified: 2025-01-23 12:01

From the article you will find out how many seconds are in a year, as well as the number of minutes, hours, days, full weeks and months. Last modified: 2025-01-23 12:01

Also, phonetics is a branch of linguistics that studies a given level of language and everything related to it: speech sounds, their combinations and positional changes, the production of sounds by the speaker and their perception by the listener. Last modified: 2025-01-23 12:01

The vast majority of nitrogen enters the body as part of proteins. In the process of metabolism, amino acids are destroyed, ammonia is formed as the end product of metabolic processes. The ornithine cycle consists of several sequential reactions, the main task of which is to detoxify NH3 by converting it into urea. Last modified: 2025-01-23 12:01

In nature, enzyme proteins work only in living systems. But in modern biotechnology, clinical diagnostics, pharmaceuticals and medicine, purified enzymes or their complexes are used, as well as additional components necessary for the operation of the system and visualization of data for the researcher. Last modified: 2025-01-23 12:01

The idea that memory and DNA methylation are linked is not new. The conditionality of synaptic transmission by histone acetylation has already been established earlier. They form the skeleton around which the DNA winds. Last modified: 2025-01-23 12:01

The article describes what the collection of information about a person is, why it is needed, for what purposes it serves, what is the assessment of this action from the point of view of the law and an example of such an action on the Internet. Last modified: 2025-01-23 12:01

Sirius is a bright star in the sky that emits a bluish glow, so it's hard not to notice it. It is worth noting that it is Sirius that is considered the leader in brightness not only in the constellation itself, but also in the vastness of the entire night sky above the Earth. Therefore, for thousands of years people have paid special attention to it. Last modified: 2025-01-23 12:01

John Lilly is a scientist whose interests lie in a variety of fields. Moreover, he conducted his research using such non-trivial methods as taking LSD and ketamine. Last modified: 2025-01-23 12:01

The logical structure of Babbage's Analytical Engine basically corresponds to the dominant design of computers of the electronic age, which implies the presence of memory ("store"), separated from the central processing unit ("mill"), sequential execution of operations and facilities for input and output of data and instructions. Therefore, the author of the development received the title of pioneer of computer technology quite deservedly. Last modified: 2025-01-23 12:01