3D printing allows the heart cavity to autonomously beat for several months. Myocardial cells | Germany | Scientists

Release time:Apr 13, 2024 23:58 PM

According to the latest news from the website of New Scientist in the UK, scientists from the University of Erlangen Nuremberg in Germany have developed a new technology that can 3D print miniature cardiac chambers. They have been shown to be able to beat autonomously for at least 3 months by printing the heart cavity using live human myocardial cells.

Artificial heart tissue can be made by culturing heart cells on molds or scaffolds, but this usually only allows the construction of simple shapes, such as sheets or rings. 3D printing can create more complex structures. For example, in 2019, researchers at Tel Aviv University in Israel demonstrated a complete heart printed in 3D. However, it cannot beat.

New 3D printing technology allows scientists to create beating heart chambers that deliver blood to other parts of the body. The researchers created an "ink" that contains living heart muscle cells, collagen and hyaluronic acid to give the heart cavity tissue structure. They use a nozzle to inject this ink into a supporting gel, which holds it in the desired shape during printing, and then melts to leave the printed structure.

Studies have shown that using this technology can print a balloon-shaped heart cavity-like structure with a height of 14mm and a diameter of 8mm, which is about 1/6 of the size of a real human heart cavity. The heart chambers started beating a week after printing and were still beating 100 days later. Stimulant drugs can make it beat faster, just like a real heart.

The researchers hope to eventually use the technology to print a complete heart that contains all four chambers. By adding a second printing ink containing blood vessel cells, they expect the ink to grow into blood vessels in the printed heart tissue.

For nearly 20 years, heart disease has been the leading cause of death in the world, and the number of deaths has increased year by year. Many critically ill patients need heart transplants but cannot wait for a donor before they run out of life. Blood-pumping heart-mimicking devices have therefore become a research hotspot. In recent years, although there have been many breakthroughs in 3D printing of the heart, it has not yet fully simulated the fine structure and complex functions of the heart. It is hoped that the new technology will make the artificial heart more durable and solid, and one day it will replace the "original product".

Two women were stabbed to death and reported to have committed a crime 4 days before the follow-up visit for schizophrenia. Suspect of a bloody murder case in a Hong Kong shopping mall appeared in court today. Male | Last Friday | Murder case
Two women were stabbed to death and reported to have committed a crime 4 days before the follow-up visit for schizophrenia. Suspect of a bloody murder case in a Hong Kong shopping mall appeared in court today. Male | Last Friday | Murder case

According to Hong Kong's Wen Wei Po, a bloody knife stabbing case occurred at Hollywood Square in Diamond Hill last Friday. The police arrested a 39 year old man on suspicion of stabbing two young women, one of whom was stabbed over 30 times. The suspect appeared in the Kwun Tong Magistrates Court this morning. The police at the Kwun Tong Magistrate's Court temporarily charged the suspect with two counts of murder last Sunday. The suspect appeared in court this morning at the Kwun Tong Magistrate's Court. Acting Chief Magistrate Zheng Jihang, after listening to the opinions of both the prosecution and defense, decided to postpone the hearing for two weeks until 9:30 am on June 19th, waiting for two psychiatric expert reports to be obtained. The defense did not object. Zheng Jihang approved the application, and the defendant needs to be temporarily detained at Xiaolan Mental Hospital. When the suspect appeared in court, he wore black framed glasses, a light gray shirt, and camouflage green shorts, and was able to answer the judge's questions normally. accordingly

Secretary of the Provincial Party Committee: The focus of Henan's "summer harvest" has shifted to agricultural machinery in the northern region of Henan Province. | Support | Science | Organization | Province | Northern Henan | Summer Harvest | Rush Harvest
Secretary of the Provincial Party Committee: The focus of Henan's "summer harvest" has shifted to agricultural machinery in the northern region of Henan Province. | Support | Science | Organization | Province | Northern Henan | Summer Harvest | Rush Harvest

Currently, the highly anticipated summer harvest work in Henan has shifted its focus to the northern region of Henan. According to the Henan Daily client, on June 4th, Lou Yangsheng, Secretary of the Henan Provincial Party Committee, presided over a special video scheduling meeting on the "Three Summers" work in the province, listened to the situation report, analyzed and judged the situation, and arranged and deployed the next steps of work. Governor Wang Kai made specific arrangements. On the evening of May 31, 2023, in Xiafutou Village, Xuliang Town, Boai County, Jiaozuo, Henan Province, villagers braved light rain in the wheat fields to harvest wheat. Visual China Map Lou Yangsheng pointed out that the current summer harvest battle in the province has entered the decisive stage. Doing a good job in summer harvest in northern Henan Province is related to the summer grain yield and seed safety. We should focus on seizing opportunities and make every effort to organize the wheat harvesting work in the northern Henan region, minimize losses, and protect the interests of farmers to the greatest extent possible. Accurate forecasting is essential

Xinhua All Media+| Welcome home! What innovative technologies are protecting the return journey of Shenzhou 15? Spaceship | Shenzhou | Technology
Xinhua All Media+| Welcome home! What innovative technologies are protecting the return journey of Shenzhou 15? Spaceship | Shenzhou | Technology

On June 4th, the return capsule of the Shenzhou-15 manned spacecraft successfully landed at the Dongfeng landing site. Astronauts Fei Junlong, Deng Qingming, and Zhang Lu all safely and smoothly exited the spacecraft, and the Shenzhou-15 manned flight mission was a complete success. What innovative technologies are there to safeguard the return journey of Shenzhou 15 in this mission? On June 4th, the return capsule of the Shenzhou-15 manned spacecraft successfully landed at the Dongfeng landing site. Xinhua News Agency reporter Lian Zhen photographed that "the sky and the ground" ensure the high-precision return of spacecraft. For the Shenzhou series spacecraft, the return and re-entry GNC technology is directly related to the life safety of astronauts. Taking the success of this return mission as a symbol, China has comprehensively upgraded its GNC system since the Shenzhou-12 manned spacecraft, which features autonomous rapid rendezvous and docking, autonomous adaptive prediction and re-entry return guidance, and has completed a comprehensive update and replacement

The Chinese naval fleet has arrived! Assembly | Navy | Chinese Fleet
The Chinese naval fleet has arrived! Assembly | Navy | Chinese Fleet

At noon today, a Chinese naval fleet consisting of Zhanjiang and Xuchang ships arrived at the assembly area of the "Comodo-2023" multinational maritime joint exercise. It is understood that the assembly anchorage for this exercise is 3 nautical miles long and 1.5 nautical miles wide, capable of anchoring up to 50 ships. Naval vessels from various countries participating in the exercise will also arrive at the anchorage today to complete the assembly of the "Komodo 2023" multinational maritime joint exercise, which is held every two years by the Indonesian Navy. This year is already the fourth edition of the exercise. The exercise will be held from June 5th to 8th in the city of Jakarta, South Sulawesi Province, Indonesia, including the port and sea phases. In the coming days, participating navies from various countries will participate in ship reading style search and rescue exercises, maritime interception and damage management exercises, aerial exercises, and other course objectives exercises

New comment: Donkey like "morale" limit pulls US debt "bomb" fuse hard to dismantle US | debt | morale
New comment: Donkey like "morale" limit pulls US debt "bomb" fuse hard to dismantle US | debt | morale

On the evening of June 1st, the US Senate passed a bill on the federal government's debt ceiling and budget, and the flame of the US debt bomb was temporarily extinguished at the last moment. The two parties in the United States have staged an extreme tug of war over the US debt bomb. Some experts believe that the US debt crisis is the result of the reckless politics promoted by the US dollar hegemony, and the underlying cause of this crisis is the highly polarized political system of the US. Since the end of World War II, the US Congress has adjusted the debt ceiling more than a hundred times. The recurring debt crisis will not only have a catastrophic impact on the US economy and people's livelihoods, but also continuously erode the value of US dollar assets such as government credit and US bonds, bringing significant and far-reaching impacts to the global economic landscape. 【