2:20 p.m.

The lecture hall of the Yangcheng Criminal Department has long been overcrowded.

Forensic scientists from all over the country sat in various corners of the lecture halls.

Everyone was relaxed, exchanging interesting stories about their work, and from time to time someone laughed.

At first, Gu Chen was ready to sit in the middle position, but when he accompanied Lu Weiwei to the toilet and came back, it seemed that someone was already sitting there in his seat.

Lu Weiwei stepped forward and knocked on the table: "This classmate, this son is ours?"

"Yours?" A middle-aged female student glanced at Lu Weiwei, and then at Gu Chen behind Lu Weiwei, and said a little unhappily: "But I didn't see anything on the table." ”

Lu Weiwei didn't speak, and looked left and right, and then found her and Gu Chen's transcript in the drawer under the table.

"Now, things have been here. Lu Weiwei said.

The middle-aged female forensic doctor suddenly looked embarrassed, but smiled politely: "I'm sorry, when we sat here before, I really didn't see anything on the table." ”

"And your eldest sister's eyes, it's very bad, and the myopia is also very serious, you see that the front row is full, sit in the back row, I can't see the projection and the whiteboard clearly, or you can see ......"

The middle-aged female forensic doctor glanced at the back row of the lecture hall, folded her palms, and said embarrassedly: "Why don't you see if you can sit in the back?" ”

"But we can't see it clearly in the back row. Lu Weiwei glanced at the back seats, only to find that there were only a few vacant seats in the corner of the back row, and she was suddenly a little unhappy.

This is obviously a special seat for scumbags, but everyone comes to the Yangcheng Criminal Department to learn knowledge, sitting there, Lu Weiwei is afraid that she will fall asleep listening to the class.

When the time comes, it will be embarrassing to fail the exam.

"Get rid of it. The middle-aged female forensic doctor narrowed her eyes and folded her hands together to apologize.

"Or ...... Let's sit in the back. Gu Chen didn't care.

When Lu Weiwei heard this, although she was ten thousand unhappy in her heart, she could only agree: "That's okay, listen to you." ”

Taking out two notebooks from the drawer, Lu Weiwei reluctantly followed Gu Chen to the far corner of the lecture hall where they sat together.

From this vantage point, you can indeed look down on the entire lecture hall, but it is too far away from the podium.

The two of them threw the notebook on the table and sat down quietly.

Lu Weiwei suddenly felt that if this position was placed in her student days, it would definitely be the best seat for couples.

But now the situation is different, everyone has to learn the real skills, go back with what 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 of them for a long time, and finally found Gu Chen and Lu Weiwei in the back row, so he also hugged the notebook and came to the side of the two.

"Why are you here?" asked Officer Wang.

Lu Weiwei was disappointed and said, "Just ...... Quite suddenly, when I went to the toilet, the seat was occupied. ”

"You really are. Officer Wang seemed to realize that he was talking a little too loudly, so he quickly lowered his tone: "Next time, remember to ask Gao Chuan Feng to help you look at your seat." ”

"Hmm. Lu Weiwei nodded.

But when I looked back, I suddenly felt that something was wrong.

"Eh, then what are you doing here, and your seat is being occupied?"

"It's not. Officer Wang waved his hand and skimmed the seat just now with his chin: "The people sitting next to me are professional forensic doctors, I am a person who does not understand forensics, sitting with these people, I feel that I don't understand what they say at all, and I don't even know some simple things." ”

"So...... You choose to sit with the scumbags?" asked Lu Weiwei.

Officer Wang smiled: "At least the instructor will ask questions or something, and he won't click on us, so it's safe to sit here." ”

"Huh. Lu Weiwei laughed dryly, and said angrily: "I said Lao Wang, you really think too highly of yourself, the instructor asked, will you choose you, a half-student?

"Alas, one thing is the same thing, after all, the three of us are together and can't be separated. ”

Officer Wang also has his own set of crooked theories, mainly sitting in the forensic pile, with no sense of security.

If someone asks themselves some small questions, it is a trivial matter if they can't answer them, and it is a big deal to embarrass the Furong Branch.

Officer Wang would not be ignorant of this truth.

......

......

2:30 a.m.

Zhang Hui, a bald instructor, with a thick stack of materials in his hand, accompanied by two other first-class police inspectors, came to the podium of the lecture hall.

As before, everyone sat at the long table on the podium, facing everyone.

Yang Ting came to the multimedia operation platform, responsible for the broadcast of projection copywriting and the writing of the whiteboard.

Obviously, Yang Ting is Zhang Hui's teaching assistant.

"Hey, hey, hey, hey. The bald instructor Zhang Hui patted the microphone, and after making sure that the equipment was normal, he said:

"Okay, are you all here?"

"It's all here. Teaching assistant Yang Ting said.

"Alright, let's get started. Zhang Hui pulled his voice, picked up the thermos cup on the table, poured a sip of wolfberry tea, and then said to everyone:

"There are a lot of young forensic doctors from all over the country, some are old forensics, some are young forensics, and some are even non-legal. ”

Speaking of this, everyone on the scene couldn't help but look in the direction of Gu Chen.

Zhang Hui didn't care about these details, and said directly: "So, here, I have to take care of all the students, try to use easy-to-understand language to give lectures, so that everyone can understand, learn, and take away, and help everyone successfully complete this study." ”

"Bang, bang, bang. ”

I don't know who took the lead in applauding, and soon, the applause at the scene was enthusiastic.

Zhang Hui pressed his hand, and when he saw the applause dissipate, he said: "Old rule, ask a simple question first." ”

"What if...... You found a body in the water, so how can we, as forensic doctors, determine the cause of death of the person involved?"

"Drowning should have some characteristic manifestations, which can be judged from these manifestations. Zhang Wenbo, a forensic doctor with a big plate face sitting in the front row, replied.

"That's right, then...... What if it's a high-level corpse? The corpse has been changed beyond recognition, can our forensic doctors still do it?" asked Zhang Hui again.

"Diatom detection. In the crowd, I don't know who shouted.

Zhang Hui nodded with satisfaction: "That's right, the answer is yes, then this method is diatom testing." ”

Glancing at Yang Ting's direction, Yang Ting immediately turned off the lights in the front row and released the slide picture.

At this moment, the blue background copywriting is about to come out.

Zhang Hui said in a loud voice: "As a single-celled plankton, diatoms probably never dreamed that their inadvertent position movement could help us in forensic work. ”

"But I am honored to tell you that our team of researchers from the Yangcheng Institute of Forensic Science and Technology in Guangdong Province has conducted long-term research on the problem of forensic diatom detection and has achieved fruitful results. ”

"We have established a forensic diatom detection system based on membrane enrichment, which has the characteristics of high efficiency, accuracy, anti-pollution and high sensitivity. ”

"It solves the major problems of traditional forensic diatom testing, greatly improves the application value of diatom testing in the diagnosis of drowning, and polishes the 'golden signboard' for forensic diatom testing. ”

"Bang bang bang. ”

In the face of Zhang Hui's confident introduction, the students in the audience also applauded very cooperatively.

Zhang Hui pressed his hand, looked back at the PPT picture, and then said with a light smile: "The picture you see now is the photo of our team receiving the award at the annual National Science and Technology Award Conference held in Beijing two years ago. ”

"Our Yangcheng Institute of Forensic Science and Technology presided over the completion of the project of 'Key Technologies and Equipment for Forensic Diatom Testing', which won the second prize of the National Science and Technology Progress Award. ”

And this is the second time that the project has won the first prize of the annual Ministry of Public Security Science and Technology Award five years ago. ”

"Therefore, it is enough to see that we have conducted in-depth exploration of the key technologies of the project in the digestion and extraction, enrichment extraction, observation and analysis of diatoms, as well as the scientific and technological innovation and application of equipment research and development. ”

"And diatoms are the 'dragon ruler' of our forensics. ”

"Looking for a dragon ruler?" When he heard instructor Zhang Hui say this term, Gu Chen's eyes lit up, and he hurriedly 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 a corpse in the water. ”

Speaking of this, Zhang Hui suddenly stopped speaking and suddenly asked: "Then the question is, when these diatoms drowned, they were inhaled due to choking, and then through what effect were they carried to the lungs, liver, kidneys, bone marrow and other organs and tissues of the drowning person?"

"Blood circulation. ”

As soon as Zhang Hui's voice fell, Gu Chen connected seamlessly.

It's just that Gu Chen sat in the back row, his voice was small, and Zhang Hui didn't hear it clearly.

On the contrary, Zhang Wenbo, the forensic doctor with a big plate face sitting in the front row, heard it, so he repeated it loudly: "It's through blood circulation." ”

"Quite right. Zhang Hui nodded slightly, and also shook his right index finger and couldn't help but say: "It is through our blood circulation that it is brought to the lungs, liver, kidneys, bone marrow and other organs and tissues of the drowning person." ”

"However, diatoms can be observed under a microscope. Zhang Hui said this, his tone suddenly became soft again, and his eyes swept over the audience.

At this moment, all the students are bowing their heads and taking notes, looking very serious.

But Zhang Hui found Gu Chen holding his chin in the corner of the last row of the lecture hall, like listening to a book.

Gu Chen held his chin with one hand, as if he didn't mean to write, just looked at himself.

Zhang Hui frowned suddenly, and could only continue: "Generally speaking, if diatoms are found in the tissues and organs of the corpse in the water, it means that the victim has drowned. ”

On the contrary, it means that the victim did not drown, but was killed by other means and then thrown into the water. ”

"So taking it a step further, if the diatoms found in the organs are significantly different from the diatoms found in the water sample from the corpse, it means that the victim drowned elsewhere, so the diatoms can also play a role in inferring the location of drowning. ”

Seeing that everyone's transcripts were recorded quickly, but Gu Chen still didn't move, the bald instructor Zhang Hui was suddenly displeased.

The heart said, why didn't this student even take notes?

If you don't take notes, how can you review when you go back?

But because of the large number of students in the audience, Zhang Hui didn't want to point it out in person, but he suppressed his anger and continued to let the assistant teacher Yang Ting play the slides.

"Okay, what you see now are a few sample pictures, what I just said, I hope you will record it carefully. ”

Therefore, how to detect diatoms from corpses in water, especially systemic organs, has always been the focus of forensic scientists, and it is also a recognized problem for forensic scientists around the world. ”

Glancing at everyone, Zhang Hui said, "Why are diatoms so popular?"

Seeing that Gu Chen began to change from one-handed cheek support to two-handed cheek support, Zhang Hui couldn't help it.

But he didn't name Gu Chen directly, but called Officer Wang next to Gu Chen and said, "The student who is sitting in the back row and taking notes, tell me, what is a diatom?"

The voice fell, and everyone in the audience turned their heads to look.

Officer Wang's expression was suddenly stunned, and he quickly looked left and right, and said in his heart that he wouldn't be so unlucky, right?

But I couldn't say it for a while, so I quickly pretended not to know and continued to bury my head in notes.

"It's you, you don't have to look at anyone else, it's the male student sitting in the back row, in the corner. Zhang Hui took a sip of wolfberry tea and reminded intentionally or unintentionally.

Lu Weiwei hurriedly lowered her head and kicked Officer Wang with her foot, and then reminded in a low voice: "Lao Wang, talk about you again." ”

"Yes. Officer Wang frowned, whispered in response to Lu Weiwei, and then bowed his back and stood up reluctantly.

When everyone saw that it was Officer Wang of the Criminal Investigation Team of the Furong Branch, they suddenly became secretly happy.

The heart said that Instructor Zhang Hui is really good at picking people.

It's not good to pick anyone, but I actually picked a non-medical professional Officer Wang, and now there is a good show to watch.

Everyone waited for Comrade Wang to come out on the spot for a while.

Seeing that Officer Wang didn't respond for a long time, Zhang Hui, who put down the thermos cup, asked disdainfully, "What's the matter?"

"Well, diatoms are...... It's ......"

Seeing that he was about to get out of trouble, but at this moment, Officer Wang suddenly found that a notebook was pushed from Gu Chen's end.

A blank notebook filled with neat rows of text.

Officer Wang's eyes lit up suddenly, and he quickly raised his head and said: "Diatoms are aquatic single-celled plants, which are widely distributed in natural water bodies such as oceans, lakes, rivers, reservoirs, ponds, ditches, and puddles, and some of them also grow on moist soils and other surfaces. ”

When the words fell, everyone at the scene was suddenly shocked.

Officer Wang, who was still slurring his speech just now, instantly seemed to be a different person, which made everyone unexpected.

Instructor Zhang Hui was also stunned, and after looking at his colleagues left and right, he raised his head and asked, "What else?"

"Supplement...... Additive?" Officer Wang was stunned and quickly scratched the back of his head.

But at this moment, Gu Chen's transcript was quietly pushed in front of him again.

The corners of Officer Wang's mouth raised, and he said loudly: "Diatoms vary in size, from a few microns to several millimeters, and have different shapes. ”

"Diatoms, on the other hand, are shells made up of silica and pectin, which are cell walls. ”

"The shell surface has a specific symmetrical ornamentation and a fine microstructure, which gives rise to a very large number of morphologically different diatom species. ”

Officer Wang's voice fell, and he also exhaled deeply.

This stunned everyone on the scene.

A police officer with a non-medical profession can tell the story of diatoms in such detail.

This level of fragrant spitting, let alone an ordinary forensic doctor, is a professional old forensic doctor, and when he says this information, he has to repeatedly consider the professional terms.

But Officer Wang blurted out, and there was nothing wrong with that.

Now it was Zhang Hui's turn to be dumbfounded.

Originally, I wanted to use the colleagues around Gu Chen to knock Gu Chen, who deserted, but I didn't expect that Gu Chen's next to him was actually a scholar?

Zhang Hui was a little embarrassed, but he 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 are the characteristics of the morphological structure of the diatom cell wall?"

All the students at the scene hurriedly bowed their heads and remained silent.

As soon as I started this, the questions of instructor Zhang Hui followed, and everyone was not familiar with diatom testing, so they came here to participate in the training.

But Zhang Hui is good, the questions are one after another, how do you answer them? What if the answer is wrong?

The personal embarrassment is small, and the disgrace to the unit is big.

Zhang Hui didn't seem to have the intention of asking others, and directly pointed to Lu Weiwei beside Gu Chen and said, "Then ...... The female student will answer it, yes, it is the female student who sat next to the male student who answered the question just now, and she is talking about you. ”

Lu Weiwei was also named inexplicably, and said that this was a disaster, and Lao Wang actually affected himself by answering the question.

Lu Weiwei also stood up with a twist, lowered her head, and scratched the back of her head.

But at this time, Gu Chen's transcript was pushed in front of Lu Weiwei again.

Lu Weiwei sneered, and after glancing for a few seconds, she said loudly into the podium: "The morphological structure of the diatom cell wall...... It has the characteristics of specificity, stability and diversity, which is an important basis for the identification of diatom species. ”

"You know that, too?"

Lu Weiwei's voice fell, and instructor Zhang Hui was stunned again.

The heart said that next to this deserted student, there was not one student sitting next to him, 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:

In addition to morphological characteristics, diatoms have many other important properties, including large biomass, sensitivity to changes in the living environment, and indicators of paleoenvironment. ”

"These characteristics make diatoms have a wide range of applications in red tide detection, aquaculture, water quality monitoring, resource investigation, paleoenvironmental analysis, oil exploration, forensic identification and other fields. ”

Zhang Hui: ???

Why is this still uneasy to play cards?

......