Scientists have successfully implanted and integrated human brain cells into newborn rats, creating a new way to study complex psychiatric disorders such as schizophrenia (精神分裂症), and perhaps eventually test treatments.
Scientists can assemble small sections of human brain tissue made from stem cells in a special container. But in such a container, “neurons(神经元) don’t grow to the size, to which a human neuron in an actual human brain would grow,” said Sergiu Pasca, the study’s lead author from Stanford University. To overcome such restrictions, researchers implanted the groupings of human brain cells, called organoids, into the brains of young rats.
Human neurons have also been implanted into adult rats before, but an animal’s brain stops developing at a certain age, limiting how well implanted cells can integrate. “By transplanting them at these early stages, we found that these organoids can grow relatively large and receive nutrients, and they can cover about a third of a rat’s brain,” said Pasca.
To test how well the human neurons integrated with the rat brains and bodies, air was blown out across the animals’ whiskers, which prompted electrical activity in the human neurons. That showed that external stimulation of the rat’s body was processed by the human brain tissue.
The scientists then conducted another test in the opposite order. They implanted human brain cells which could respond to blue light, and then trained the rats to expect a “reward” of water from a pipe when blue light shone on the neurons via a cable in the animals’ brain. After two weeks, they found pulsing the blue light sent the rats scrambling to the pipe.
The team has now used the technique to show that organoids developed from patients with Timothy syndrome grow more slowly and display less electrical activity than those from healthy people.
Tara Spires-Jones, a professor at the University of Edinburgh’s UK Dementia Research Institute, said the work “has the potential to advance what we know about psychiatric disorders.”
1. Why did scientists research on rats instead of the special container?A.Because psychiatric disorders are too complex. |
B.Because rats also suffer similar psychiatric illnesses. |
C.Because it limits the growth of human brain neurons. |
D.Because human brain neurons grow too quickly in it. |
A.Rats’age has a significant influence on the research. |
B.Human brain cells can’t be implanted into adult rats. |
C.Rats’ brain won’t develop if they receive human neurons. |
D.Human neurons can grow larger in adult rats’ brain than young rats’. |
A.To train rats to respond to external stimulations. |
B.To show similarities between rats and human tissues. |
C.To confirm human brain cells could grow well in rats’ brains. |
D.To check whether signals could be sent back to rats’ body. |
A.It can advance more experiments on rats. |
B.It can further our study of psychiatric illnesses. |
C.It can provide some useful experimental methods. |
D.It can promote our knowledge of human brain cells. |
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【推荐1】I’m a hiker -“born to hike”, as my husband likes to joke. It does my heart and soul good to take a pack and head out on a trail (小路), especially when I’m alone and can let my mind wander where it will. The experience of hiking is unique, research suggests, conveying benefits beyond what you receive from typical exercise.
Hiking keeps your mind sharper than many other forms of exercise. As a professional writer, although I’m busy with my work, I often spare some time to hike.
Hiking can increase our creativity. I’m sure I’m not alone in finding that walks in nature let my mind wan der freely in creative directions.
Hiking helps strengthen a positive relationship with the natural world. Besides being good for us, hiking may also help the world around us. After all, if we can walk and cover longer distances, we could use cars less and reduce our carbon footprint.
A.Hiking helps to keep you calm and happy. |
B.Hiking and writing have strong connections. |
C.Beyond that, hiking benefits our planet indirectly. |
D.It is not only good for our bodies, but also good for our moods, minds, and relationships. |
E.In fact, I’ve written many of my songs while hiking on a trail. |
F.This all goes to show that hiking may be one of the best ways to move your body. |
G.It not just makes me feel good, but also keeps my brain in top shape. |
【推荐2】Most students do an IQ test early in their school career. Even if they never see their results, they feel that IQ is what determines how well they are going to do in life. When they see other students doing better than them, they usually believe that those students have a higher IQ and that there is nothing they can do to change facts. However, new research into EQ suggests that success is not simply the result of a high IQ.
While your IQ tells you how intelligent you are, your EQ tells you how well you use your intelligence. Professor Salovey, who invented the term EQ, gives the following description. At work, it is IQ that gets you hired, but it is EQ that gets you promoted. Supported by his academic research, Professor Salovey suggests that when predicting someone’s future success, their character, as measured by EQ tests, might actually matter more than their IQ.
Professor Salovey may be correct. For example, have you ever wondered why some of the smartest students in your class, who you think deserve good grades, sometimes end up failing exams? Perhaps their failure is because of their low EQ. People are often mistaken in thinking that those with high IQs always have high EQs as well. This association can exist, but it is as possible for someone with a low IQ to have a high EQ or someone with a high IQ to have a low EQ.
It is generally believed that people with high EQs are open to new ideas and have positive attitudes towards life. They are also less likely to be troubled by problems. On the other hand, there is little doubt that people with low EQs often have problems getting on with other people and dealing with difficult situations; thus, they have a harder time surviving in life.
People generally believe that a person’s IQ is determined by birth. However, most social scientists agree that EQ has a lot to do with education. Some are trying to study the possibility to improving a person’s EQ, especially in terms of “people skills”, such as understanding and communication.
Professor Mayer, recently announced the results of a study on senior high school students. When normal students were introduced to students with disabilities, they found that, afterwards, the normal students were more willing to help people with difficulties. They also showed a better understanding of the disabled students’ feeling compared to students who had not been involved in the study. There was also an obvious change in the disabled students’ attitudes. They became more positive about life and more willing to try new things.
The results of studies such as these show that EQ is as important, if not more important than IQ. To get ahead in the world and lead a happy successful life means getting on with other people and being able to understand and react to situations in the best way possible. This requires a high EQ — the higher the better. And the fact that it might be possible to raise EQs means that schools need to make sure that their students are receiving the education they really need and know that their futures are not entirely determined by their IQs.
1. What does the first paragraph want to convey?A.Only a high IQ can’t result in success. |
B.Most students never see their IQ test results. |
C.Students can’t change their IQs with education. |
D.IQ determines how well students are going to do in life. |
A.Because they probably have a lower IQ. | B.Because they probably have a lower EQ. |
C.Because they are often mistaken in thinking. | D.Because they are likely to be troubled by problems. |
A.People’s character might not matter more than their IQ. |
B.“People skills” are of little importance on one’s road to success. |
C.People with high EQs usually have negative attitude towards life. |
D.Schools should reconsider if their students are receiving the education they need. |
A.Practice makes perfect. | B.IQ is important for us. |
C.Success comes with a high EQ. | D.Success owes to wisdom. |
【推荐3】A food allergy (过敏) is a medical condition that occurs when the body’s protection system perceives certain foods as a threat and responds to them with an allergic reaction.
Food allergies are often confused with food intolerance. But intolerance is a less serious condition that does not involve a response from the immune system.
Symptoms (症状) of a food allergy. Symptoms can range from mild to severe. And they may differ each time a specific allergen appears. Symptoms can include: a skin rash or hives, swelling of the face or lips, or feeling lightheaded or dizzy.
Treating a food allergy. For minor reactions, you can take some medicine. For severe reactions, however, turn to doctors for help.
A.Avoiding harm from allergy |
B.Preventing an allergic reaction |
C.Not everyone knows what a food allergy is |
D.Many people do not understand the severity of the issue |
E.The best way to handle a food allergy is to avoid such foods |
F.For some people, certain allergens can bring a severe reaction |
G.Certain foods are considered priority allergens by Health Canada |
【推荐1】3,900 feet below the surface, scientists in New Zealand found a “mysterious creature”. They discovered the newly-hatched ghost shark(魔鬼鲨) on the Chatham Rise, a part of the ocean floor located off the eastern coast of the South Island.
Ghost sharks are deep-water animals closely related to sharks and rays. These fish are also some-times called ratfish or rabbitfish.
They lay eggs on the seafloor where the embryos (胚胎) feed off the egg yolk (蛋黄) until they hatch. A scientist on the team who discovered the baby ghost shark said they were able to identify the shark as a baby because its stomach was still full of egg yolk.
“We don’t actually know much about ghost sharks,” said Brit Finucci, a fisheries scientist on the study. “What we do know mostly comes from adults of their species. So it’s very rare and very uncommon to find juveniles of a lot of these species, so that’s why I got quite excited.”
Because ghost sharks make their home in very deep water, they are difficult to study. While the exact species of ghost shark isn’t known yet, scientists hope this discovery will help inform them of the knowledge of this mysterious creature.
Scientists hope the “very rare” finding will fill in research gaps about the species. “We’re hoping this will give us some more indication about the biology and ecology,” said Finucci. Researchers are using this shark to account for biological differences between juvenile and adult members of the subclass. Finucci added, “We’re not sure what we’re going to find, which is also quite exciting.”
1. How did the scientists identify the shark as a baby?A.By its habitat. | B.By its appearance. |
C.By the food it consumed. | D.By the eggs it laid. |
A.Grown-up fish. | B.Young sharks. | C.Strange eggs. | D.Uncommon creatures. |
A.It will lead to research work into deep water. |
B.It warns people to protect uncommon sea lives. |
C.It may reveal unknown facts about ghost sharks. |
D.It excites scientists’ curiosity about ghost sharks. |
A.Mysterious Creature Found to Lay Eggs in Deep Water |
B.Newly-hatched Baby Shark Excites Scientific Imagination |
C.Scientists Announce New Findings on Rare Shark Species |
D.Rare Baby Ghost Shark Discovered off New Zealand Coast |
【推荐2】Mobile phones should be kept from classrooms, the UK minister for schools has said. Nick Gibb said he had concerns about the effect that the phone was having on children, and also said the Government should introduce lessons for pupils on how to limit their screen time.
Mr Gibb said, “Schools obviously are free to set their own behaviour policies but my own view is that schools should ban (禁止)mobile telephones and smart phones inside school, and particularly inside classrooms. I believe very strongly that children should be limiting their own use at home. Every hour spent online and on a smart phone is an hour less talking to family, and it's an hour less exercise and it's an hour less sleep. And of course it is a lack of sleep that research is showing can have a damaging effect on a child's mental health.”
The parents are told that children will be asked to break off at least every two hours and avoid social media before bedtime. The UK would be following in the footsteps of European countries if schools were to introduce a ban. with French pupils being told to leave their smart phones at home when they returned from their summer holidays last year.
At the Festival of Education at Wellington College last summer, Professor Michael from America said that any sensible head would ban mobile phones. “It's far too distracting for children having mobile phones. Texting, playing games, all this takes place. Mobile phones go off in classrooms, disrupting lessons. Ban them. If children want to use a phone in an emergency they can use the school phone.”
1. What's Nick Gibb's attitude towards using mobile phone in school?A.Cautious. | B.Supportive. |
C.Indifferent. | D.Disapproving. |
A.An hour less exercise a week. | B.More effects on sleep quality. |
C.Less communication with family. | D.An improvement in mental health. |
A.UK. | B.New Zealand. |
C.USA. | D.France. |
A.Mobile Phones cause bad effects on our study. |
B.Mobile phones should be banned from classrooms. |
C.Parents should forbid their kids to use mobile phones. |
D.Students can use mobile phones in case of emergency. |
【推荐3】One of the most famous archaeological discoveries in all of history is The Terracotta Army. It's also called the Terracotta Warriors and Horses and they were found by farmers digging for a well in Xi'an in 1974. Becoming a UNESCO World Heritage site in 1987, the spectacular figures continue to attract millions of visitors from all over the world. Yet the excavations (发掘) are unfinished. Famously, archaeological work at the site and the accompanying Tomb of the First Qin Emperor has been allowed to slow down until technology advances enough to preserve the art works currently buried underground. In addition to this, safety concerns have been raised regarding the unusually high levels of mercury (水银) found on the soil. It's said that this is from the mercury streams which were in the floor of the burial chamber, but only time will tell if this ancient tale is true.
Currently 8000 soldiers have been found, each one with a distinctively different look. This was achieved through an early use of assembly-line (流水线). The warriors were assembled using moulds(模具), with 8 different heads to choose from, and features being added by skilled craftsmen. Studying the warriors and their horses offers historians an important insight into this period in Chinese history. The technology used to assemble the underground army was truly remarkable. Over 40,000 bronze weapons were found, and after more than 2000 years they still appear sharp. How is this possible? The ancient Chinese managed to use protective chrome plating (镀铬), something which was thought to have been invented in Germany in 1937! Chinese metallurgy(冶金) was thousands of years ahead of its time.
When it is finally uncovered, the sight will truly be spectacular and much more will be understood about China's first Emperor and the level of technology the ancient Chinese possessed.
1. Why does the archaeological work at the site slow down?A.To attract more visitors. |
B.To protect the environment. |
C.To avoid the low levels of mercury. |
D.To preserve the underground art works. |
A.All the 8000 soldiers don't have the same look. |
B.Germany metallurgy was thousands of years ahead of its time. |
C.Assembly-line was used in the construction of the warriors. |
D.The bronze weapons still appear sharp because of German technology. |
A.The discovery of The Terracotta Army was not accidental. |
B.It was impossible for the ancient Chinese to use chrome plating. |
C.The technology used to assemble the underground army was the best. |
D.Much more will be known about China's first Emperor when his tomb is finally uncovered. |
A.A new archaeological discovery. |
B.The Terracotta Warriors and Horses. |
C.Amazing Ancient Chinese Technology. |
D.The Tomb of the First Emperor in ancient China. |