wavenovel Chapter 1118 Wool Socks
Chapter 1118 Wool Socks
Chapter 1118 Wool Socks
Liu Jinghui was playing with his cell phone, looking at Jiang Yuan from time to time.
He is a brain eater, so naturally he doesn't need to lie over a microscope and study like a tech geek.
This also made Liu Jinghui discover something strange. Jiang Yuan, who was originally reading the instruction manual and looking at the microscope, now seemed to be distracted, just like a student who started to lose focus in the middle of class.
Liu Jinghui couldn't help but smile. Jiang Yuan in this state looked like a newcomer. If the police and the criminal could make a two-way choice, Jiang Yuan in this state would probably be chosen by many people.
In Liu Jinghui's mind, he could not help but imagine the scene of the giant dragon slaughtering the criminals... The sharp dragon claws, with one grab and one throw, would kill several criminals; the gushing dragon flames, with one spray and one swing, would kill a group of criminals; the thick dragon tail, with one smash and one turn, would kill a battalion of criminals...
"I plan to invite Professor Su Lei and others over." Jiang Yuan withdrew his gaze at some point, and his tone became serious.
Liu Jinghui often analyzes the people around him. He noticed that Jiang Yuan's condition was unusual. Liu Jinghui couldn't help but ask, "What did you see?"
Jiang Yuan couldn't say that he had figured out the system's task. He rolled his eyes and wrongly accused the microscope, saying, "The equipment that Lanyue City Bureau bought is a bit troublesome. I'm too lazy to look at it. Let Professor Su Lei and the others come over to study it."
"Is it so complicated? I saw you in other police stations, using their microscopes and other things, and you were very good at it." Liu Jinghui just said this, and then said: "Then you call. What should we do when we wait for their time?"
"Let's have hotpot. My dad gave me a lot of sliced beef and they're frozen in the refrigerator." Jiang Yuan said as he took out his cell phone and called Professor Su Lei.
The diatom database of the Taihe River Basin was created by Professor Su Lei's project team. Jiang Yuan was equivalent to the client of her team. In addition, with the technical advantages of forensic botany, Su Lei immediately gave a positive answer after a phone call.
After hanging up the phone, Jiang Yuan said to Liu Jinghui, "There's nothing else to do today. Zhang Lei's DNA has just been obtained. It will be almost tomorrow when the DNA is compared. Let's go back."
Different samples for DNA comparison require different amounts of time. Blood is the most time-saving and labor-saving, and when a corpse decays, the blood is the first to spoil.
The criminal science laboratory in Lanyue City is quite powerful, and Jiang Yuan doesn't have to worry about the normal procedures.
On the contrary, Liu Jinghui felt a little uncomfortable skipping work with Jiang Yuan in broad daylight.
That evening, Su Lei and her doctoral student Qiao Shengli landed in Lanyue City.
She is also a busy person now. Since she added forensic botany to her research and published two important papers, Su Lei not only attends academic conferences constantly, but also attracts the attention of police stations across the country because of her cooperation with Jiang Yuan, and she is often invited.
For a scholar at the Agricultural Research Institute, this was a very interesting and revolutionary life change. Su Lei had a lot of fun.
Qiao Shengli's anticipation made her even happier.
They checked into the hotel that night. The next morning, Qiao Shengli got up two hours earlier and put on full makeup to meet Jiang Yuan.
As usual, Jiang Yuan invited everyone to breakfast at Yilanju.
The fried dumplings with a crispy but not hard shell and rich soup were welcomed by everyone.
Qiao Shengli couldn't help but eat two, and then stared at Jiang Yuan in a daze.
Even when sitting down, Jiang Yuan was still half a head taller than the person next to him, which made him very conspicuous.
As Qiao Shengli watched, she was thinking about what to say next. At this moment, she saw the door of the box open.
"Captain Jiang, I happened to be having breakfast here too, and I heard that you were here. What a coincidence." Dong Xifeng, the deputy general manager of the film and television city, had sweat on the back of his neck.
Behind him, two sleepy beauties came out, looked at Jiang Yuan again, and called out in a coquettish voice: "Brother Jiang..."
Qiao Shengli felt inexplicably angry and ate two more fried dumplings!
……
Su Lei and Qiao Shengli both had experience in working outside, so they took all their small equipment with them and notified the Lanyue Municipal Bureau in advance to borrow large items such as clean workbenches.
Lanyue University had all the equipment that Lanyue City Bureau did not have. With Dai Mingsheng's presence, it was easy to confirm the time.
Su Lei, Qiao Shengli and others immediately got down to work.
There weren't many pieces of clothing left, and most of them were washed away. However, Jiang Yuan's investigation team had always been strict in their discipline, and some of the clothing fragments left behind, as well as some soil from the crime scene, could all be used for forensic botany analysis. The remaining wool socks were especially well preserved, and were stained with a large amount of plant pollen, so their value was still increasing.
For the deceased Zhang Lei, this pair of socks should be the most useful item he has ever purchased.
The pollen required for forensic botany can be as small as nanometers, so even a small pair of socks can provide a lot of information.
However, picking out the pollen one by one and putting them on slides for identification is only the first step. Classifying and analyzing the pollen is the most difficult part.
Here, there are several levels of identifying spores and pollen. Level 1 forensic botany can roughly identify the genus and species of most spores and pollen, but that's all.
In the class of mammals, the genus is the level of cats and dogs. Taking the genus Canis as an example, there are 8 species in this genus, including gray wolf, coyote, African wolf, Ethiopian wolf, etc. In the eyes of ordinary people, these different species of wolves are probably indistinguishable.
The domestic dogs that are familiar to ordinary people are actually just a subspecies of the "gray wolf".
There are 39 species in this subspecies, including the domestic dog, Arabian wolf, Arctic wolf, Mexican wolf, Siberian wolf, Florida wolf, Japanese wolf, Austro-Hungarian wolf, Chinese wolf and Mongolian wolf, among others.
As you can tell from the name, if you master this step, the task of classification and identification will be much easier. Because the distribution range of some plants is limited, if you can identify the key plants, you can narrow down a lot of the scope at once.
Of course, the final result still depends on the pollen map. The pollen map composed of multiple pollen spores is similar to DNA, which can be accurate to the meter level and is basically impossible to replicate.
Su Lei is at about LV2 level in forensic botany, and Qiao Shengli is at about the maximum level LV1, so Su Lei can barely do forensic botany, but she is very slow and has to keep looking up information for comparison.
Qiao Shengli was basically unable to independently identify forensic botany. She had little experience and little knowledge of taxonomy. She could only independently identify the "gray wolf" species. For the next botanical classification, she had to look up information for each species and even compare the information very carefully. This was an unacceptable time cost for a murder case.
If Jiang Yuan uses level 4 forensic botany to solve cases, it can only be said that it is just enough.
However, if he opens a temporary +1, he can easily identify the subspecies. Although he still needs to look up information for some less familiar genera and species, for the case, identifying to this level has already brought about direct changes.
In terms of the dog family, Jiang Yuan can already tell the difference between a Husky and a Golden Retriever.
This means that Jiang Yuan had an easy time in the first stage. Similarly, a botanist of this level would not fail in the stage of classification and analysis of pollen.
This scene, in Qiao Shengli's eyes, was a little bit unbelievable.
She waited until Jiang Yuan took a break before quickly taking the thermos to refill Jiang Yuan's water bottle and asking, "For this case, the classification phase requires distinguishing between the first and second scenes, which should be difficult. Which spores were contaminated at the first scene, and which were contaminated at the second scene. It's easy to get confused."
"If we just want to distinguish the first and second scenes, there are many ways." Jiang Yuan drank tea and said easily: "The most basic method is to analyze the pollen from the second scene again. Excluding the pollen from the second scene, the rest..."
"The rest are from the first scene!" Qiao Shengli answered enthusiastically.
Jiang Yuan smiled and said, "It could also be the pollen brought by the murderer."
The victim's body was moved here and he might have been contaminated with pollen along the way. The contact between the murderer and him inevitably led to the exchange of pollen.
"Yeah, I didn't think that much." Qiao Shengli looked cute with full makeup, looking very girlish.
Jiang Yuan swallowed his saliva with a gulp and continued, "The places where the victim passed by during his lifetime may also be contaminated with spores and pollen."
"Yes, there are so many factors involved." Qiao Shengli frowned slightly.
"It sounds difficult, but if we analyze it one by one, it's just the same. The pollen in the places where the victim passed by must be relatively evenly distributed, with a relatively small number of pollen per unit area, and it should be mainly wind-pollinated plants. After the victim died, when he touched the ground, the amount of pollen he was exposed to increased exponentially."
Qiao Shengli listened carefully, still frowning and nodding.
For her, this level of judgment was too difficult.
Jiang Yuan smiled and said, "For this case, there is another clever way."
"any solution?"
"Wool socks." Jiang Yuan continued to promote the value of wool socks, saying, "The victim must have worn shoes before death, so the part below the socks would not be easily exposed to pollen before the victim died. Wool socks are particularly prone to retaining pollen... In fact, just analyzing this pair of wool socks is enough to make a forensic botany judgment."