Liu Jinghui played with his mobile phone and observed Jiang Yuan from time to time.
He is a brain eater, so naturally he doesn't have to sit on a microscope and study like a tech geek.
This also made Liu Jinghui discover something strange. Jiang Yuan, who was originally reading the instructions and looking at the microscope, seemed to be blank at this time, 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 was quite new. If police and criminals could choose in both directions, Jiang Yuan with this appearance would probably be chosen by many people.
In Liu Jinghui's mind, he couldn't help but start to reflect the scene of the giant dragon slaying formation... The sharp dragon claws, one grab and one throw, could kill several criminals; the spewing dragon flames, one spray and one throw, could kill a bunch of criminals.
;The thick dragon tail smashed and turned, which was the life of a battalion of criminals...
"I'm going to invite Professor Su Lei and others over." Jiang Yuan didn't know when he withdrew his gaze and his tone became serious.
Liu Jinghui often analyzes the people around him. At this time, he saw that Jiang Yuan's condition was unusual. Liu Jinghui couldn't help but asked: "What did you see?"
Jiang Yuan couldn't say that he understood the system's tasks. He rolled his eyes and wronged the microscope and said: "The equipment bought by the Lanyue Municipal Bureau is a bit troublesome. I'm too lazy to look at it. I asked Professor Su Lei and others to come over and study it.
Just give it a try."
"Is it so complicated? I see that in other police stations, you use their microscopes and other things with your hands." That's what Liu Jinghui said, and then said: "Then you call. Wait.
What should we do with their time?”
"Let's eat hot pot. My dad gave me a lot of sliced beef and kept it frozen in the refrigerator." Jiang Yuan said, taking out his cell phone and calling Professor Su Lei.
The diatom database in the Taihe River Basin was developed by Professor Su Lei's project team. Jiang Yuan was equivalent to her team's first party. Coupled with the technical advantages of forensic botany, I made a phone call and Su Lei immediately gave her affirmation.
answer.
After hanging up the phone, Jiang Yuan said to Liu Jinghui: "There is nothing else to do today. I just got Zhang Lei's DNA. It will be almost tomorrow when the comparison comes out. Let's go back."
Different testing materials are used to compare DNA, and the time required is also different. The most time-saving and labor-saving one is blood, and when the body rots, the blood is the first to be damaged.
Lanyue City's Criminal Science Laboratory is quite capable, and Jiang Yuan doesn't need to worry about normal procedures.
On the contrary, Liu Jinghui was always a little uncomfortable following Jiang Yuan while skipping work in broad daylight.
That night, Su Lei landed in Lanyue City with her doctoral student Qiao Shengli.
She is also a busy person now. Since her research direction included forensic botany and she published two blockbuster papers, Su Lei has not only continued to attend academic conferences, but also received attention from police stations across the country because of her cooperation with Jiang Yuan.
Pay attention and you will receive invitations from time to time.
For a scholar at the Agricultural Research Institute, this was a very interesting and revolutionary life change. Su Lei had a great time.
Qiao Shengli was even more happy with her expectations.
They checked into the hotel that night, and the next morning, Qiao Shengli got up 2 hours early, put on full makeup and came to see Jiang Yuan.
Jiang Yuan had breakfast at Yilanju as usual.
The fried dumplings with a semi-crispy shell and thick soup were well received by everyone.
Qiao Shengli couldn't help but eat two, and then looked at Jiang Yuan in a daze.
Even when he was sitting down, Jiang Yuan was more than half a head taller than the person next to him, which was very conspicuous.
As Qiao Shengli watched, she was thinking about what to say next. At this time, she saw the door of the box open.
"Captain Jiang, I happened to be having breakfast here, and I heard that you were coming over. What a coincidence." Dong Xifeng, the vice president 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 shouted together: "Brother Jiang..."
Qiao Shengli felt angry for no reason and ate two more fried dumplings!
…
Su Lei and Qiao Shengli also have experience working outside. They brought all the small equipment with them and notified the Lanyue Municipal Bureau in advance to borrow large items such as ultra-clean workbenches.
Lanyue University has all the equipment that the Lanyue Municipal Bureau does not have. With Demingsheng coming forward, it is easy to determine the time.
Su Lei, Qiao Shengli and others immediately got into busy work.
There were not many pieces of clothing left at that time, and most of them had been washed away. However, Jiang Yuan's task force had always had strict inspection disciplines, so some of the pieces of clothing left behind, as well as some soil from the crime scene, etc., could be used.
For forensic botanical analysis, especially the remaining wool socks, the stockings are well preserved and contaminated with a large amount of plant pollen, so their value is still increasing.
For the deceased Zhang Lei, this pair of socks was probably the most useful item he purchased.
The sporopollen required for forensic botany can have units as small as nanometers. Therefore, even a small pair of socks can provide a lot of information.
However, picking out the pollen one by one and putting them on a slide for identification is only the first step; classifying and analyzing the pollen is the most difficult.
Here, there are several levels of identifying pollen. LV1’s forensic botany can probably identify most of the genera and species of pollen, but that’s about it.
Placed in the class Mammalia, the genus is to the same level as the genus Cat and Canis. Taking the genus Canis as an example, there are 8 species in this genus, including gray wolves, coyotes, African wolves, Ethiopian wolves, etc., and in
From the perspective of ordinary people, these different species of wolves are most likely indistinguishable.
The domestic dogs that ordinary people are familiar with are actually just a subspecies of the "grey wolf".
There are 39 species of this subspecies, including domestic dogs, Arabian wolves, Arctic wolves, Mexican wolves, Siberian wolves, Florida wolves, Japanese wolves, Austro-Hungarian wolves, Chinese wolves, Mongolian wolves, etc.
It can be seen from the name that 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 the range a lot at once.
Of course, you still have to rely on the pollen map in the end. The pollen map composed of a variety of pollen spores is similar to DNA, can be accurate to the meter level, and is basically non-replicable.
Su Lei is about at the level of forensic botany LV2, and Qiao Shengli is about the level of full level LV1. Therefore, Su Lei can barely do forensic botany, but it is very slow and she has to constantly check the information for comparison.
Qiao Shengli is basically unable to independently carry out forensic botanical identification work. Her experience is still shallow and her taxonomy accumulation is also small. She can only identify the "grey wolf" species independently. After that, she can basically identify each botanical classification.
You have to check the information, and even compare the information very carefully. This is an unacceptable time cost for a murder case.
If Jiang Yuan handles the case with LV4 forensic botany, it can only be said to be just enough.
However, if he opens the temporary +1, he can easily identify the subspecies. Although he still needs to check the information for some unfamiliar genera and species, for the case, identification at this level has already brought
direct change.
In the Canine genus, Jiang Yuan can already tell the difference between a Husky and a Golden Retriever.
This means that Jiang Yuan was very relaxed in the first stage. Similarly, a botanist of this level would not be able to relax in the stage of classifying and analyzing pollen.
And this scene, in Qiao Shengli's eyes, couldn't help but feel a little unbelievable.
She waited until Jiang Yuan took a break, then quickly took a hot water bottle, went to refill Jiang Yuan's water, and then asked: "In this case, it should be difficult to distinguish the first scene from the second scene during the classification process. Which sporopollen are
Which ones were contaminated at the first site and which ones were contaminated at the second site? It’s easy to get confused.”
"There are many ways to distinguish between the first and second sites." Jiang Yuan drank tea and said relaxedly: "The most basic method is to analyze the spores from the second site first and eliminate the spores from the second site.
Pink, the rest..."
"The rest are from the first scene!" Qiao Shengli answered enthusiastically.
Jiang Yuan smiled and said: "It may also be the pollen brought by the murderer."
The victim's body was moved here, and it may have been contaminated with pollen along the way. The contact between the murderer and him inevitably led to the exchange of pollen.
"Yes, I didn't think so carefully." Qiao Shengli looked cute in full make-up and had a very girly look.
Jiang Yuan made a "gumble" sound, swallowed, and then said: "The places where the victim passed during his lifetime may also be contaminated with pollen."
"Yes, there are so many factors involved." Qiao Shengli frowned slightly.
"It sounds difficult, but in fact, if you analyze it one by one, it's just that. The places where the victim passed by during his lifetime must have been contaminated with pollen. The number of pollen per unit area is relatively small, and it should be wind.
Mainly pollen plants. After the victim dies, when it touches the ground, the amount of pollen it comes into contact with increases exponentially."
Qiao Shengli listened carefully, still frowning and nodding.
For her, judgment at this level is too difficult.
Jiang Yuan smiled and said: "In this case, there is another trick."
"What can I do?"
"Wool socks." Jiang Yuan continued to increase the value of wool socks, saying: "The victim must have been wearing shoes before his death, so the part below the sock tube was less likely to come into contact with pollen before the victim died. Wool
Socks are particularly prone to retaining pollen... In fact, simply analyzing this pair of wool socks is enough to make a forensic botanical judgment."
