The lecture theater at the Yangcheng Criminal Division is already overcrowded.
Forensic medical students from all over the country were sitting in various corners of the lecture theater.
Everyone looked relaxed and exchanged interesting stories about their work that they liked to see. From time to time, some people burst into laughter.
At first, Gu Chen planned to sit in the middle seat, but when he accompanied Lu Weiwei to the restroom and came back, it seemed that his seat was already occupied by someone.
Lu Weiwei stepped forward and knocked on the table: "This classmate, does this seat belong to us?"
"Yours?" A middle-aged female student glanced at Lu Weiwei, then at Gu Chen behind Lu Weiwei, and said a little unhappy: "But I didn't see anything on the table."
Lu Weiwei did not speak, but looked around, and then found her and Gu Chen's transcripts in the drawer under the table.
"Hey! Things have always been here." Lu Weiwei said.
The middle-aged female forensic doctor suddenly looked embarrassed, but she smiled politely: "Sorry, when we were sitting here before, we really didn't see anything clearly on the table."
"And your eldest sister's eyesight is very bad, and her short-sightedness is very serious. Look, the front row is full of people. Please sit in the back row. I can't see the projection and whiteboard clearly. How about you..."
The middle-aged female forensic doctor glanced at the last row of the lecture theater, clasped her palms together, and said sheepishly: "Why don't you see if you can sit in the back? I'm really embarrassed."
"But we can't see very clearly in the back row." Lu Weiwei glanced at the back row seats and found that there were only a few free seats in the corners of the last row, and she suddenly felt unhappy.
This is obviously a seat reserved for bad students, but everyone comes to Yangcheng Criminal Division to learn knowledge. Sitting there, Lu Weiwei is afraid that she will fall asleep during the lecture.
If you fail the exam then it will be embarrassing.
"Please." The middle-aged female forensic doctor narrowed her eyes and put her hands together to apologize.
"How about... let's sit in the back." Gu Chen said nonchalantly.
When Lu Weiwei heard this, although she was unhappy, she could only agree: "Okay, I'll listen to you."
Taking out two notebooks from the drawer, Lu Weiwei reluctantly followed Gu Chen and sat in the corner of the lecture theater.
From this perspective, you can indeed overlook the entire lecture theater, but it is too far away from the podium.
The two threw the notebook on the table and sat down quietly.
Lu Weiwei suddenly felt that if this position was used as a student, it would definitely be the best seat for couples.
But the situation is different now. Everyone must learn their true skills, bring back the knowledge they have learned, and take on the task of training.
Therefore, Lu Weiwei did not dare to slack off...
Officer Wang searched for the two people for a long time, and finally found Gu Chen and Lu Weiwei in the back row, so he also came to them with his notebook in hand.
"Why are you here?" Officer Wang asked.
Lu Weiwei was quite disappointed and said: "It was... quite sudden. I went to the toilet and my seat was occupied by someone."
"That's true of you." Officer Wang seemed to realize that he spoke too loudly, so he quickly lowered his tone: "Next time, remember to ask Gao Chuanfeng to look after your seat for you."
"Yeah." Lu Weiwei nodded and said.
But when I looked back, I suddenly felt like something was wrong.
"Eh? Then what are you doing here, Lao Wang? Your seat has been occupied by someone too?"
"No." Officer Wang waved his hand and lifted his seat with his chin: "The people sitting next to me are all professional forensic doctors. As a person who does not understand forensic medicine, I sit with these people and feel what they are saying. I am completely
I don’t understand, I don’t even know some simple things.”
"So...you choose to sit with the bad students?" Lu Weiwei asked.
Officer Wang smiled and said: "At least the instructor won't ask us questions later. It's safer to sit here."
"Haha." Lu Weiwei laughed twice, but also said angrily: "I say Lao Wang, you really think too highly of yourself. When the instructor asks a question, will he choose you, a half-hearted student? Are you overthinking it? With Gao Chuan
Wouldn’t it be nice to sit with Forensic Doctor Feng Liu?”
"Oh, one thing is another thing. After all, the three of us are together and cannot be separated."
Officer Wang also has his own set of myths, mainly because he doesn't feel safe sitting among the forensic doctors.
If someone asks himself some trivial questions, it is a trivial matter if he cannot answer them, but it is a big matter if he embarrasses the Furong Branch.
Officer Wang will not understand this truth.
…
…
2:30.
Bald instructor Zhang Hui, accompanied by two other first-level police inspectors, came to the podium of the lecture theater with a thick stack of information in his hands.
As before, everyone sat at the long table on the podium, facing everyone.
Yang Ting came to the multimedia operating platform and was responsible for the presentation of projection copy and writing on the whiteboard.
Obviously, Yang Ting is Zhang Hui's assistant.
"Hey, hey, hey, hey." Zhang Hui, the bald instructor, patted the microphone. After confirming that the equipment was normal, he said:
"Okay, is everyone here?"
"Everyone is here," said assistant coach Yang Ting.
"Okay, let's start now." Zhang Hui raised his voice, picked up the thermos cup on the table, took a sip of wolfberry tea, and then said to everyone:
"There are many outstanding forensic doctors from all over the country here. Some are old forensic doctors, some are young forensic doctors, and some are even non-forensic professionals."
After saying this, everyone at the scene couldn't help but look in Gu Chen's direction.
Zhang Hui didn't pay attention to these details and said directly: "So, here, I must take care of all students, try to use easy-to-understand language to teach, so that everyone can understand, learn, and take it with them, and help everyone
Complete this semester of study successfully.”
"Pah, pah, pah."
I don’t know who took the lead in applauding, but soon, the scene was filled with enthusiastic applause.
Zhang Hui pressed his hands and saw that the applause dissipated, then he said: "As a rule, let's ask a simple question first."
"If... you find a body in the water, how can we, as forensic doctors, determine the cause of death?"
"Drowning should have some characteristic symptoms, and it can be judged based on these symptoms." Zhang Wenbo, a big-faced forensic doctor sitting in the front row, answered quickly.
"That's right, then... what if it's a highly decomposed corpse? The corpse is beyond recognition. Is there anything our forensic doctors can do?" Zhang Hui asked again.
"Diatom detection." Someone in the crowd shouted.
Zhang Hui nodded with satisfaction: "Yes, the answer is yes, then this method is diatom testing."
Glancing in Yang Ting's direction, Yang Ting immediately turned off the lights in the front row and released the slideshow.
At this moment, the copywriting on the blue background is ready to appear.
Zhang Hui said in a loud voice: "As single-celled plankton, diatoms probably never dreamed that their inadvertent positional movements could help us in forensic work."
"But I am honored to tell you that our team of researchers from the Yangcheng Criminal Science and Technology Institute of Guangdong Province has conducted long-term research on the issue of forensic diatom testing and achieved fruitful results."
"We have established a forensic diatom testing system based on membrane enrichment, which is efficient, accurate, anti-pollution, and highly sensitive."
"It has well solved the major problems of traditional forensic diatom testing, greatly improved the application value of diatom testing in the diagnosis of drowning, and polished the 'golden brand' of forensic diatom testing."
"Pap-pap-pap-pap."
Faced with Zhang Hui's confident introduction, the students in the audience also applauded cooperatively.
Zhang Hui pressed his hands, looked back at the PPT picture, and then said with a faint smile: "The picture you are seeing now is the picture of our team receiving the award at the annual National Science and Technology Awards Conference held in Beijing two years ago.
"
“Our Yangcheng Institute of Criminal Science and Technology presided over the project of ‘Key Technologies and Equipment for Forensic Diatom Inspection’ and won the second prize of the National Science and Technology Progress Award.”
"And this is the second time this project has won the first prize after winning the first prize of the Ministry of Public Security Science and Technology Award 5 years ago."
"So, this is enough to show that we have conducted in-depth exploration of the project's key technologies such as digestion and extraction, enrichment and extraction, observation and analysis of diatoms, as well as the technological innovation and application of equipment research and development."
“And diatoms are our forensic medicine’s ‘dragon-seeking ruler’.”
"Looking for Dragon Ruler?" When he heard the instructor Zhang Hui say this term, Gu Chen's eyes lit up and he quickly wrote these three words on the blank notebook.
Zhang Hui continued to smile at everyone and said: "As a single-celled plankton, this diatom probably never dreamed that its inadvertent position movement could help forensic work."
"This small diatom can play a huge role in determining the cause of death of corpses in the water."
Having said this, Zhang Hui suddenly stopped speaking and suddenly asked: "Then the question is, when the drowning person drowned, these diatoms were inhaled due to choking in the water, and through what effect were they brought to the drowning person's lungs?
, what about organ tissues such as liver, kidney and bone marrow?”
"blood circulation."
As soon as Zhang Hui finished speaking, Gu Chen connected seamlessly.
It's just that Gu Chen was sitting in the back row and his voice was quiet, so Zhang Hui didn't hear it clearly.
On the contrary, the big-faced forensic doctor Zhang Wenbo sitting in the front row heard it, so he repeated loudly: "It is through blood circulation."
"Exactly." Zhang Hui nodded slightly, and raised his right index finger and said without hesitation: "It is through our blood circulation that it is taken to the lungs, liver, kidneys, bone marrow and other organs and tissues of the drowning person."
"But, diatoms can be observed with a microscope." Zhang Hui said here, his tone suddenly became softer again, and he scanned the people in the audience.
At this moment, all the students were taking notes with their heads down, looking very serious.
But Zhang Hui found Gu Chen in the corner of the last row of the lecture theater, holding his chin as if listening to a book.
Gu Chen held his chin with one hand and seemed to have no intention of writing, but simply looked at himself.
Zhang Hui suddenly frowned and could only continue: "Generally speaking, if diatoms are found in the tissues and organs of a corpse in the water, it means that the victim died of drowning."
"On the contrary, it means that the victim did not drown, but was killed by other means and then his body was thrown into the water."
"So further analysis, if the diatoms found in the organs are significantly different from the diatoms in the water sample where the body was found, it means that the victim drowned elsewhere, so diatoms can also be used to infer the place of drowning.
effect."
Seeing that everyone was writing notes very quickly, but Gu Chen remained motionless, the bald instructor Zhang Hui was immediately displeased.
I wonder why this student doesn’t even take notes?
If you don’t take notes, how will you review them when you go back?
However, due to the large number of students in the audience, Zhang Hui could not point it out to his face. He just suppressed his anger and continued to let the teaching assistant Yang Ting show the slides.
"Okay, what you see now are a few sample pictures. I hope everyone will carefully record what I just said."
"Therefore, how to detect diatoms from corpses in water, especially from systemic circulation organs, has always been the focus of forensic scientists and is also a recognized problem for forensic scientists around the world."
Scanning the crowd, Zhang Hui added: "Why are diatoms so popular?"
When Gu Chen started to hold his cheek with one hand instead of holding his cheek with both hands, Zhang Hui couldn't help it anymore.
But he did not name Gu Chen directly. Instead, he named Officer Wang next to Gu Chen and said, "The student sitting in the last row who is taking notes, tell me, what are diatoms?"
After the words fell, everyone in the audience turned to take a look.
Officer Wang's expression suddenly froze, and he quickly looked around, thinking that he couldn't be so unlucky, right? Sitting in the last row, he couldn't escape the roll call questions?
But for a moment I couldn't tell, so I quickly pretended not to know and continued taking notes.
"It's you. You don't have to look at anyone else. You're the male student sitting in the back row and in the corner." Zhang Hui took a sip of wolfberry tea and reminded him intentionally or unintentionally.
Lu Weiwei quickly lowered her head, kicked Officer Wang, and then reminded in a low voice: "Old Wang, I'm talking about you."
"I know." Officer Wang frowned and responded to Lu Weiwei in a low voice. Then he bowed his back and stood up reluctantly.
When everyone saw that it was Police Officer Wang from the Criminal Investigation Team of Furong Branch of Jiangnan City, they suddenly felt secretly happy.
I thought that instructor Zhang Hui was really good at selecting people.
It's not a good choice, so I actually picked Police Officer Wang, who is not a forensic professional. Now I'm in for a good show.
Everyone was waiting for Comrade Lao Wang to be embarrassed on the spot.
Seeing that Officer Wang didn't respond for a long time, Zhang Hui put down the thermos cup and then asked disdainfully: "What? I don't know?"
"Well, diatoms are just...just..."
He was about to be embarrassed, but at this moment, Officer Wang suddenly noticed that a notebook was pushed from Gu Chen's side.
The blank notebook is filled with several neat rows of words.
Officer Wang's eyes suddenly lit up, he quickly raised his head and said: "Diatom is a kind of aquatic single-celled plant, widely distributed in oceans, lakes, rivers, reservoirs, ponds, ditches, puddles and other natural water bodies, and some of them also grow
On moist soil, and other surfaces.”
As soon as the words fell, everyone at the scene was suddenly shocked.
Officer Wang, who was still slurring his words just now, seemed to be a different person in an instant, which surprised everyone.
Instructor Zhang Hui was also stunned. After looking around at his colleagues, he raised his head and asked, "What else? Do you have anything else to add?"
"Supplement... supplement?" Officer Wang was stunned and quickly scratched the back of his head.
But at this moment, Gu Chen's notebook was quietly pushed in front of him again.
Officer Wang raised the corner of his mouth and said loudly: "Diatoms vary in size, from a few microns to several millimeters, and have different shapes."
"Diatom is a shell composed of silica and pectin, which is the cell wall."
"The shell surface has specific symmetrical patterns and fine microstructure, which has resulted in a large number of diatom species with morphological differences."
When Officer Wang finished speaking, he took a deep breath.
This shocked everyone present.
A police officer who is not a forensic professional can describe diatoms in such detail.
With such a level of fragrance, not to mention ordinary forensic doctors, even professional and experienced forensic doctors have to think twice about the professional terminology when speaking out this information.
But Officer Wang blurted out what he said, and he was absolutely right.
This time it was Zhang Hui's turn to be dumbfounded.
I originally thought of using the colleagues next to Gu Chen to punish Gu Chen for deserting, but I didn't expect that the person sitting next to Gu Chen was actually a top student?
Zhang Hui was a little embarrassed, but still refused to give up.
He first pressed his hand and asked Officer Wang to sit down first, and then asked: "Does anyone know what the characteristics of the morphological structure of diatom cell walls are?"
All the students present quickly bowed their heads and remained silent.
Xin said that as soon as this started, instructor Zhang Hui's questions came one after another. Everyone was not familiar with diatom detection, so they came here to participate in the training.
But Zhang Hui is better. Questions come one after another. How do you answer them? What if you answer the questions wrongly?
It's a small thing to embarrass an individual, but it's a big thing to embarrass an organization.
Zhang Hui didn't seem to have any intention of asking anyone else, and pointed directly at Lu Weiwei who was next to Gu Chen: "Then... let the female student answer the question. Yes, she is sitting next to the male student who answered the question just now.
Female student, I’m talking about you.”
Lu Weiwei was also named inexplicably, and she thought to herself that this was diverting trouble to the east. Lao Wang actually got himself involved by answering the question?
Lu Weiwei also stood up awkwardly, lowered her head, and scratched the back of her head.
But at this moment, Gu Chen's notebook was pushed in front of Lu Weiwei again.
Lu Weiwei chuckled, glanced for a few seconds, and then said loudly to the podium: "The morphological structure of the diatom cell wall...has the characteristics of specificity, stability, and diversity, which is an important basis for the identification of diatom species."
"You know this too?"
After Lu Weiwei finished speaking, instructor Zhang Hui was stunned again.
I was thinking that there was not one top student sitting next to this deserted student, but two?
Thinking of this, Zhang Hui also had a headache, but before Zhang Hui could speak.
Lu Weiwei, who had already answered the question, added loudly:
"Moreover, in addition to morphological characteristics, diatoms also have many other important characteristics, including huge biomass, sensitivity to changes in the living environment, and indicators of paleoenvironment."
"These characteristics make diatoms widely used in red tide detection, aquaculture, water quality monitoring, resource surveys, paleoenvironmental analysis, oil exploration, forensic identification and other fields."
Zhang Hui:???
Why the hell are you still uneasy about playing tricks?
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