Chapter five hundred and seventy seventh bland course?
Because the Mystery version of the microscope is based on magic, unlike the Earth's, it is nothing to observe multiple targets at the same time with one microscope. Even this Mystery version can do the same thing as the Earth's dissecting microscope, which makes
Observe that the sample shows a three-dimensional appearance.
However, Fen did not intend to use such a complicated operation. The second sample she prepared to present was the leaves she had previously ordered the apprentice to pick. With the same simple and neat movements, she skillfully removed the thin film on the lower epidermis and passed through it.
Do the same and put it on the stage.
With one animal sample and one plant sample, Fen explained the characteristics of each part of the cell and the differences between animals and plants. In order to let everyone understand the cells more clearly, she also took the epidermis from someone.
, blood and other objects, making an introduction. It makes someone feel like being treated as a guinea pig, and this guinea pig also helps control the screen in class.
Just because there are one kind of animal and plant cells, of course it cannot take too long. After all, the colleges in Midland do not have the pressure of exams like the schools on Earth, so the teacher has to say in class from time to time: 'This is the key point.
There will be words like ' in the future exams.
Teaching in the Lost World is more like the concept of giving a briefing on Earth, focusing on the key points, and then outputting a large amount of information. This is someone's new experience after taking a few mathematics courses.
In particular, the people who come to this advanced course are all magicians. They have a solid foundation and are not the kind of apprentices who have just received enlightenment. And those who can become official magicians have good memory and understanding skills. Simply
It feels like teaching top students. It’s no wonder that when you teach in the Holy City, if you don’t do well, you will be disgraced and kicked out.
The definition of teaching well is also very simple. Either the new content is shocking or subversive enough, or the new content is too much for others to absorb. If you can do these two things, you are a good teacher in the eyes of this group of top students.
So after talking about the basic differences and types of animal and plant cells, Fen directly introduced the cells in all parts of the human body. This included the differences and uses of each cell, the uses of the organs composed of cells, and the functions of these organs in the body.
System purpose.
Then the gratifying thing is that the following introductions all use pre-prepared pictures instead of collecting them on the spot. This way someone escaped the fate of being dismembered.
However, although these new knowledge were novel, they failed to touch the calm hearts of these old magicians. Everyone studied in the classroom calmly, copying notes quietly. Of course, in such a situation, someone would
You can guess it from the beginning. After all, the magicians in Lost Land all follow a practical route. It is too purely academic, and it is difficult not to make people wonder, 'What is the use of learning this?'
So with thirty minutes left in the first life lesson, Lin's suggested syllabus takes a small turn. Fen's ability to control time is also very precise, even when she's not looking at her pocket watch - someone made it long ago.
The magic gold pocket watch is still one of the lich's trophies. She can't get it back. Woohoo──or the clock, she can still say one hour and thirty minutes after the class starts:
"The above is an introduction to cells in various parts of the human body. Including humans, all living things that can be seen on the Mysterious World can be classified as multicellular organisms. That is, each living thing is composed of thousands of cells with different functions.
Composed of cells. So the question comes again, do single-celled organisms exist? They are organisms that have the ability to move, reproduce, etc., with a single cell."
Without waiting for anyone to answer, Fen asked again: "Who among you here has water?"
Although no one answered, none of the magicians opened their mouths to chant incantations, and they easily used an apprentice-level magic - water gathering spell, and condensed it into water balls in the air.
"Sorry, everyone, I didn't make it clear. What I need is drinkable spring water or well water, not water created by magic."
The water ball in the air disappeared silently. One of the magicians picked up a sheepskin water bag and said: "This is the spring water from the Fairy Spring in the forest. Can this water be used?"
The spring water of the Fairy Spring is one of the specialties of the Holy City of Estali and a high-priced product. It is said that long-term drinking can help magicians accumulate power faster. However, people who are not suitable for it, or those who drink too much, will develop resistance.
symptom.
"Okay, this is really great." Fen took out another empty petri dish, came to the magician who spoke, and said, "Please pour some on this glass dish, that's it."
Although the Fairy Spring was expensive, the volume of the small vessel seemed to be less than one mouthful. The magician who brought the spring water didn't care and poured it half full.
"Okay, everyone, this is the spring water of the Fairy Spring. Let's take a look at what's in here."
Fen returned to the podium and placed the water in the petri dish directly on the stage of the microscope without doing any treatment. The next operation was performed by herself, not by Lin, who was her assistant. The operation was also done by herself.
It is not just microscopic magnification, but the analysis function and comparison of the program are turned on. Looking at the constantly updated data on the hydroscope screen, Fen smiled and said: "Haha, this world in the water is really exciting.
"
The analysis was very fast, and it was all completed in a short time. Fen said: "The amount of water in the petri dish was between about three and four milliliters, and some different types of microorganisms were detected, most of them in small quantities. However, the most numerous ones were this
,──”
At this time, a large number of long strips of bacteria with rounded ends, no spores, and rod-shaped bacteria were displayed on the hydroscopic screen.
"─E. coli, which mainly lives in the large intestine of animals. Some strains are beneficial bacteria that can produce substances needed by the human body and prevent the growth of other pathogenic bacteria. However, some strains can cause food contamination, thereby making eating
Patients develop symptoms of food poisoning. Common manifestations include vomiting, abdominal pain and diarrhea. In addition to the intestinal tract of living things, it often exists in environments contaminated by feces."
As soon as Fen's speech came out, everyone was in an uproar.
What a joke! This is the Fairy Spring, one of the most popular items among magicians in the Holy City. It can be used as a material for making props, or you can drink it directly. The person who provided the Fairy Spring is not an unknown young man.
The young man is a veteran magician with a good reputation, so he can't come up with fakes or deliberately deceive people.
The water in the small glass dish was poured out of the sheepskin bag in front of everyone. Although it was taken to her strange machine for inspection by the lich, there was no chance of tampering in front of everyone.
.
So what’s the point of saying that there are things in the water that can poison people? It’s even related to feces!
There was always only Fen in the acting class, and someone finally spoke. The first question was: "Sir, Fen Ni, have you made a mistake? How could there be something poisonous in the Fairy Fountain? Not yet.
I’ve heard of people dying from drinking the Fairy Fountain.”
"What do you think 'poison' is? Something that will kill you if you simply eat it? Let me introduce another concept here, lethal dose. Everything is toxic, but the question is, how much does it take to kill someone? Some
Things are highly poisonous, and even a little bit of powder will kill people if it comes into contact with the mouth. But this is not the case with some things, such as chronic poisons, which will continue to accumulate in the body. When the accumulated amount reaches a certain level,
It will cause disease in the human body and lead to death. Although the operating mechanism of diseases is not exactly the same as that of poisons, generally speaking, there are still some reference points."
"What do you mean?"
"These single-celled organisms, I call them bacteria. Bacteria are everywhere, but there may be more or less after ingestion into the human body. In small amounts, the body's immune system will automatically eliminate these disease-causing bacteria. But if the amount is
When too many are eliminated in time, they will induce symptoms in the human body, which is the so-called illness. As for yourselves, no one has become unwell because of drinking the fairy spring? Especially the characteristics are what I just talked about.
similar."
"This..." The magician who asked the question was speechless for a moment. Because the symptoms that Fen just mentioned are actually resistance symptoms of those who are not suitable. In the end, he could only reluctantly defend: "This is all a follow-up theory.
?”
Fen was not angry at the distrustful questions raised by others or the suspicious looks cast by others. Instead, he nodded towards Lin and began to show pictures one by one.
The first picture is of a semi-abandoned village, with corpses lying everywhere. The few people who look alive all look miserable. And the deceased did not die from war or monsters. Their faces and bodies
There were abscesses of various sizes, and the ends of the limbs turned black.
With just one glance, everyone present recognized the disease as the infamous Black Death, the bubonic plague.
"This is a record I made after I accidentally heard about a plague somewhere during my travels and went to observe it. Most people think that this infectious disease is spread by rats. In fact, there are two vectors of infection, besides rats.
, and fleas, but they only serve as a bridge for disease transmission. The main pathogen is──"
Lin duly changed the picture.
"─Yersinia pestis is very similar to the E. coli shown before, but the bacteria are longer and segmented, and they belong to diplococcus Bacillus. The cause is excessive decline after drought, resulting in massive growth of plants, herbivores and
As a result, insects have multiplied in large numbers, and rats have multiplied in large numbers because of the increase in food, exceeding the number that the rat feeders can control, and then the disaster has expanded. The way to prevent it is to prevent rats, eliminate rats and fleas, and do not get close to infected animals.
People, avoid continuing to spread germs.──”
The next picture shows another ruined village. There are also dead people, but unlike the villages where people died of the plague, the dead here have haggard faces, as if they have withered.
"─This is another village that is infected with a type of plague, which I call cholera. The main characteristics of those infected are diarrhea, dehydration, vomiting, muscle twitching, etc., which in turn leads to sunken eye sockets, clammy and cold skin.
Inelastic. The main mode of transmission is through water or food contaminated by the patient's feces. The method of prevention is simply to isolate the sick person and drink clean water. The main pathogen is─"
Another picture.
"──Vibrio cholerae. The bacterium is short, but has a single flagellum, pili, and some are capsule. There is no good treatment method. The only thing to pay attention to is to avoid dehydration of the patient. Therefore, we can only constantly replenish water and wait for the patient
Get through this on your own.”
After that, Fen continued to show several infectious diseases of plague level and the bacteria that caused the main lesions. Now, the masters below could not sit still!