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raya323
raya323
20.11.2020 04:42 •  Английский язык

Antibiotics
Since the end of the twentieth century modern medicine has been making an extensive use of various antibiotics. It should be noted that antibiotics are powerful agents in combating infections. The problem of discovering new antibiotics can be most successfully solved at special research institutes which may have a small experimental plant producing preparations of new antibiotics.
Russia has several research institutes working in this field. Before new generation of antibiotics made its appearance Russian science had produced a series of new effective drugs, such as albomycin, etc. This practically non-toxic preparation has found wide application in the treatment of pneumonia in newborn and small children. It is also successfully used in obstetric and gynecological practice. Surgeons have to use it during the treatment of the septic processes caused by staphylococci which can resist other antibiotics. It has been established experimentally that the composition of its molecule includes iron and it has a peculiar mechanism of affecting the bacteria.
Mention must also be made of tetracyclines, such as chlortetracycline. It was introduced after chlorphenol had been discovered. Therefore chlortetracycline was considered the second broad – spectrum antibiotic developed for therapeutic purposes. It was isolated in 1948 from biomycin. Because of its yellow colour it was marked as auremycin. Another antibiotic of this series is tetracycline. It has been found that it possesses great advantages over its sister compounds. It may produce less toxic effect and penetrate the cerebrospinal fluid to a much greater extent. It has been stated that in ordinary use the tetracyclines can be given orally in doses of 250 mg.

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elenamatrus777
elenamatrus777
20.11.2020
St. Petersburg is a city of rare beauty. Impossible to list all definitions, whom his describe: the pearl of the Russian state, one of the most or cities on the planet, majestic, and camping on D. Almost every his street has attitude to historical events.  Start a walk along Nevsky prospect from the Admiralty. You can see here many attractions: Griboyedov canal, Kazan Cathedral, Gostiny Dvor, Anichkov bridge. In the Kazan Cathedral You can see the burial place of the greatest military leader Mikhail Kutuzov. During this walk you should definitely visit The Russian Museum, which contains treasures of Russian art. This Museum contains about four hundred thousand masterpieces of national painting, which cover all genres, schools and species for many centuries, from the tenth to the twentieth century. The most important expositions of the Russian Museum are in the Mikhailovsky Palace, built for Emperor Paul the First, who lived in it only forty days. In 1823 the castle was located a Military engineering school, among the pupils of which was the outstanding Russian writer F. M. Dostoevsky. In this historic Palace, the interior of the Church, illuminated in 1800, with its extraordinary paintings, such as the work of Ivanov "Prayer for the Cup", has survived to the present day . On the square of Arts is a monument to the great poet Alexander Pushkin.  Walking along Nevsky prospect, you can walk to the corner with a Sink, where there is another attraction – Stroganov Palace. This Palace is a wonderful creation of an architectural genius, built in the style of Russian Baroque. Designed Stroganov Palace F. B. Rastrelli. Walking through the Kazan Cathedral, You can turn right and continue the walk along the canal. In this place there is a well-known Bank bridge, which is decorated with statues in the form of griffins. Bank bridge is one of the most famous places in St. Petersburg. Walking down the street, You can go to a Large Seating Courtyard.  You can rest on Ostrovsky square, where the monument to Empress Catherine the Great is located. In this place there is a significant architectural structure – Alexandrinsky theatre. Behind the theater is a unique street, similar to what is not in the world – Architect Rossi street. This street is characterized by absolute symmetry. The length of the street is 220 meters, width and length are equal to 22 meters, all the buildings are absolutely the same. Walking down the street the street Architect Rossi, You will be taken to the embankment of the Fontanka river. In this place is the Lomonosov bridge. It is necessary to pass to the Anichkov bridge, which is very close. This bridge is a wonderful equestrian groups of Peter Klodt.  An unforgettable experience will leave a walk through St. Isaac's and Senate squares, which offer a wonderful view of the panorama of St. Petersburg. Here you will find attractions such as the monument "the bronze horseman" , St. Isaac's Cathedral, the arch of the building of Senate and Synod, the monument to Emperor Nicholas II. At the same time it is impossible not to visit St. Isaac's Cathedral and the colonnade, from the height of which the majestic St. Petersburg is perfectly visible. In St. Isaac's Cathedral You can see a large number of outstanding works of art: paintings, sculptures, mosaics, made by world-famous authors, such as K. Bryullov, F. Bruni, P. Klodt, etc.the height of the colonnade of the Cathedral is forty-three meters. It offers a beautiful view of the center of St. Petersburg.
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Рбурга  Достопримечательности Санкт-Петербурга Город на Неве своими достопримечательностями привлекает огромное количество туристов из разных стран мира. В Санкт-Петербурге работают более 170 музеев. Исаакиевский собор — одна из главных достопримечательностей Петербурга — был построен в качестве кафедрального храма. Он был заложен в честь Петра 1 и назван по имени св. Исаакия Далматского. Он строился 40 лет, на его отделку ушло 400кг золота и 16 тонн малахита. Адрес: Исаакиевская пл., д. 4; т. (812) 315-97-32; время работы: выходной – среда, Ежедневно с 10:00 до 20:00 (с 1 мая по 1 октября), касса до 19:00, колоннада до 19:00. end_of_the_skype_highlighting Еще одна из главных достопримечательностей Санкт-Петербурга — один из самых известных и огромных музеев мира — Эрмитаж. Музейный комплекс состоит из семи зданий. Коллекция Эрмитажа насчитывает около 3 миллионов экспонатов, которые выставлены в 400 залах.
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