Penicillin is an important antibiotic with high efficiency, low toxicity and wide clinical application. Its successful development has greatly enhanced human's ability to resist bacterial infection and led to the birth of antibiotic family. Its appearance ushered in a new era of treating diseases with antibiotics. Through decades of improvement, penicillin injection and oral penicillin have been able to treat pneumonia, meningitis, endocarditis, diphtheria, anthrax and other diseases respectively.
After penicillin, antibiotics such as streptomycin, chloramphenicol, oxytetracycline and tetracycline are constantly produced, which enhances the ability of human beings to treat infectious diseases. But at the same time, the drug resistance of some bacteria is gradually increasing. In order to solve this problem, researchers are currently developing more effective antibiotics, exploring how to prevent bacteria from acquiring drug resistance genes, and developing plant-based antibacterial drugs.
2. The invention of light bulb
The light bulb, which emits light and gives off heat through electric energy, was invented by Henry Goebbels (Edison actually found a suitable material, that is, he invented the incandescent lamp with strong practicability, and the light bulb appeared as early as 1854). The most common function of light bulbs is lighting.
With the development of society, the use of light bulbs has also undergone different changes. At first, it may be for the convenience of production and life, but with the progress of society, the use of light bulbs has also changed obviously, and functional lights with different uses such as "automobile, beautifying environment and decoration" have begun to appear.
3. The invention of the automobile
1879, German engineer karl benz successfully tested the two-stroke experimental engine for the first time. 1June, 883, founded "Ben Ci Company and Rheinland Gas Engine Factory".
1885, he made the first Ben Ci patented motor vehicle in Mannheim, which was a three-wheeled vehicle with a two-stroke single-cylinder gasoline engine and 0.9 horsepower. This car has some basic characteristics of modern cars, such as spark ignition, water cooling cycle, steel tube frame, leaf spring suspension, rear wheel drive, front wheel steering and brake handle.
18861On October 29th, German engineer karl benz applied for a patent for his motor vehicle. In June165438+1October of the same year, Karl Benz obtained the German patent (patent number: 37435a).
This is considered to be the first modern car in the world. For the above reasons, people generally take 1886 as the first year of automobile, and some scholars take the year when Carl Benz made the first three-wheeled automobile (1885) as the year when the automobile was born.
4, the invention of the plane
The airplane is one of the most important inventions in the early 20th century, and it is generally believed that it was invented by the Wright brothers in America. Their flight on 1903 17 February 17 was recognized by the International Aviation Federation (FAI) as "the first controlled sustained power flight of heavier-than-air aircraft", and in the same year they founded Wright Aircraft Company.
Since the invention of the airplane, it has become an indispensable tool of modern civilization. It profoundly changed and influenced people's lives and opened the history of human conquest of the blue sky.
5. Train
A train, also known as a railway train, refers to a vehicle running on the railway track, which is usually composed of multiple carriages and is one of the important means of transportation for human modernization.
The most important machine in human history, called steam locomotive in the early days, has an independent orbit. Railway trains can be divided into freight cars and passenger cars according to their load capacity, and there are mixed passenger and freight cars.
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