Menu English Ukrainian russian Home

Free technical library for hobbyists and professionals Free technical library


BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

Are jellyfish dangerous? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Comments on the article Comments on the article

Did you know?

Are jellyfish dangerous?

Jellyfish are the strangest sea creatures because they are made entirely of a gelatinous mass. They do not look like fish and are not their relatives. The sting serves as protection for them, which causes discomfort and can cause dangerous consequences.

The shape of a jellyfish resembles an inverted bowl. Under the bowl is their digestive system. The digestive system ends in a tube that hangs down from the center and has a bell at the bottom. The tentacles located around the circumference of the bowl are used for collecting food and for swimming. Between the tentacles are nerve centers and sensory organs. The cup-shaped body of a jellyfish consists of two thin layers of tissue with a jelly-like layer between them. If a jellyfish is pulled out of the water, it will dry out very quickly, because its body is 98 percent water. Of course, if the jellyfish is small, then the burns from its sting may not be very dangerous. But with big ones it's different.

Experts say that there are jellyfish in which the body reaches four meters in diameter, and tentacles - up to 30 meters in length. If a jellyfish like this "hugs" you, then you may have difficulty breathing, or partial paralysis may occur. The Portuguese soldier, one of the largest jellyfish, can kill and eat a whole mackerel.

On the coast of Australia, the sea wasp jellyfish is known to be the cause of many deaths. What makes a jellyfish dangerous is its tentacles. Some of them are equipped with thorns that dig into the body of the victim. The spines are associated with poisonous glands that kill or paralyze the victim.

Author: Likum A.

 Random interesting fact from the Great Encyclopedia:

Why did Theseus and Pirithous descend into the underworld?

When Hippodamia, the wife of Pirithous, and Phaedra, the wife of Theseus, died, the two widowed heroes decided to marry the daughters of Zeus. Theseus chose the Spartan princess Helen, sister of the Dioscuri, and Pirithous helped him kidnap her.

In the bride of Pirithous, friends decided to get Persephone herself, the wife of Hades. They descended into the underworld and, somehow forcing Charon to transport them across the Styx and past the watchdog Cerberus, soon knocked on the doors of the palace of Hades. The lord of the realm of the dead calmly listened to their unprecedentedly brazen demand and, pretending to be hospitable, invited them to sit down. Suspecting nothing, they sat where it was suggested, and found themselves on the throne of oblivion.

Theseus and Pirithous were rooted to the stone throne so much that they could no longer get up from it without being crippled. They were scourged by the Erinyes and torn with their teeth by Kerberus, and Hades looked at all this and grinned grimly. When, four years later, Hercules came to the kingdom of Hades to pick up Kerberos, he recognized two friends. They silently held out their hands to him, begging for help. Persephone graciously allowed Hercules to free her hapless kidnappers and take them with him if only he could. Hercules tore Theseus off the stone and returned to the ground, but when he tried to free Pirithous, the earth shook, and Hercules was forced to retreat.

True, there are those who believe that Theseus and Pirithous never descended into the kingdom of Hades, but tried to kidnap the wife of the king of Thesprot. He, having found out in time about the unholy plan, took the insolent prisoners prisoner, threw Pirithous to be eaten by dogs, and Theseus imprisoned, from where Hercules rescued him.

 Test your knowledge! Did you know...

▪ Why do animals love salt?

▪ How long do earthworms reach?

▪ What kind of people bury babies in trees?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Curcumin Prevents Vision Loss 29.09.2022

Researchers at Imperial and University College London have developed a new way to deliver curcumin that scientists believe will help diagnose and treat glaucoma more effectively at an early stage.

Glaucoma is a group of eye diseases characterized by increased intraocular pressure. The patient may develop various visual defects up to blindness.

The pigment contained in turmeric protects the nerve cells of the retina from damage. Previously, researchers believed that curcumin could only be delivered orally, but this method could not be effective because the component is poorly soluble in the blood. In order to get the right dose of the substance, a person would have to take up to 24 tablets per day, which is fraught with digestive problems.

Scientists have solved this problem by developing a special "nanocarrier" in which curcumin is contained inside a surfactant that is safe for health and is used in eye drops.

Experts say that the new delivery method increases the permeability of curcumin by 400 thousand times and allows you to effectively localize the substance in the eye tissues. Experiments on glaucoma rats have shown that the use of drops reduces the rate of degradation of the retina.

Other interesting news:

▪ A well-fed woman becomes more romantic

▪ DVD recorders will replace VCRs

▪ Non-alcoholic beer is good for the heart

▪ Ultra-durable sensor for smart textiles

▪ New NXP Semiconductors Chips for Miniature Power Supplies

News feed of science and technology, new electronics

 

Interesting materials of the Free Technical Library:

▪ site section Lighting. Article selection

▪ article Artificial earth satellites. History of invention and production

▪ article How long has craniotomy been practiced? Detailed answer

▪ Anil article. Legends, cultivation, methods of application

▪ article 430 MHz transverter. Encyclopedia of radio electronics and electrical engineering

▪ article Electronic engraving on wooden materials. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

Name:


Email (optional):


A comment:





All languages ​​of this page

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua

www.diagram.com.ua
2000-2024