Peng Shinian's brows were tightly locked, this expression made Da Zhao feel bottomless, and just when Da Zhao was about to ask again, Peng Shinian took a deep breath and said solemnly:

"I don't know how to explain it, but the toxicology of this toxin, which is similar to tetrodotoxin (TTX), is mainly through the effect of sodium ion channels, and inhibits nerve conduction, all in all, it is a very scary toxin with a high mortality rate.

In nature, eating shellfish with toxic cyanobacteria after red tide will cause poisoning reactions, and PSP is bound in shellfish, so shellfish ingestion of this toxin will not cause harm to themselves;

When a person ingests food containing paralytic shellfish toxins, the toxins are released rapidly and exhibit toxic effects, with an incubation period of only a few minutes or hours, and symptoms include muscle paralysis of the limbs, headache, nausea, salivation, fever, rash, etc.

Severe cases of muscle paralysis, dyspnea, and even suffocation and death, this is limited to the concept of a small amount of food, injection or wound poisoning will be faster and deeper, of course, PSP can also be extracted manually, I have read related papers, but because the toxin is unstable, the storage conditions are harsh, can not be made into freeze-dried, can only be stored in liquid state. ”

The more Liu Yongxin listened, the more shocked he became, and raised his hand to stop Peng Shinian.

"Wait Xiao Peng, do you mean that this toxin must be purified with a large number of infected shellfish, or simply find cyanobacteria containing PSP, and after the poison is extracted, the liquid state is not convenient for transportation and storage, and may be extracted nearby?"

"Yes."

Receiving an affirmative answer, everyone stood up.

"So does it mean that even if the murderer can't make his own poison, he is a person who knows this toxin very well, and he can easily get it, and to get these PSPs, he needs a corresponding laboratory, what conditions does Xiao Peng need to extract this PSP, and how many raw materials are needed to get this amount that can soak arrows?"

Peng Shinian pushed his glasses and frowned.

"I don't know, this needs to be calculated, I need to check the relevant research data, and I need to know all the laboratory information in the Qindao area, after all, the extraction of PSP is not a very high-end test, but the amount of raw materials required is very large, I will tell you after calculating the specific amount."

Liu Yongxin nodded.

"If you have a direction, it's better than if you don't have a direction, then let's start calculating, the information of the Qindao regional laboratory, Zhu Xingxing will go to Cui Lili to ask for it in a while, I think this is at least something that a first-level laboratory can do, and it will be filed with the health department or the veterinary department.

Da Zhao reported to Xu Ju, according to what Xiao Peng said, to extract so many toxins, the raw materials needed will not be very few, and the purchase method is by no means an ordinary seafood market, these places are all caught by farmers or ordinary fish, by the way, can all Xiao Peng's shellfish be extracted? ”

Peng Shinian shook his head, raised his mobile phone and said.

"I just searched, there is a relevant study on PSP in Huaguo, I found a 2010 document, according to the above records, there is a PSP sea area distribution map in Huaguo, 13 types of shellfish were found around Nanyue Province, and the toxicity range is 152~198 MU/(100 g)-1.

Eight species were found in the Bincheng waters, and the highest value of shellfish toxin was less than 200 MU/(100 g)-1, while three varieties were found in the Qindao waters, with a toxicity range of 652~117MU/(100 g)-1, and the highest one was Ezo scallops. ”

"What are Ezo scallops?"

Da Zhao looked confused, after all, what he said was a noun, and he couldn't react for a while, Peng Shinian hurriedly enlarged the pictures in the literature and showed them to Da Zhao.

Da Zhao glanced at it and was even more surprised.

"Damn, isn't this a scallop, this thing is poisonous?"

Liu Yongxin slapped Da Zhao in the face, and the crisp sound stopped the whispering in the entire office.

"You don't listen to it, Xiao Peng didn't say it, it's not the scallop problem, but because this shellfish is good at using cyanobacteria, and PSP has no effect on this shellfish, and it can also accumulate in the body, just like a sieve, it exists inside, a specific sea area, and there are more toxic spirulina in contact, so poisonous scallops are formed, right?"

Peng Shinian shrunk his neck and nodded vigorously.

"It's still Uncle Liu'er, that's what it means, but on that report, there is only a map of the area, and it doesn't indicate the specific location of Qindao, I collected some information before I came, and there is a scallop breeding area on it, but I don't know if it's this Ezo scallop."

Liu Yongxin waved his hand.

"Pang Tianhang and Zou Jialong are helping to check, what local data do you need, they came to contact the leaders, and now they will start to check separately, Zhao Xinli on the spot, what else do you find?"

Da Zhao snapped his fingers and held his notebook in front of Liu Yongxin, he knew Liu Yongxin's ability.

"There are footprints, the grass to the edge of the masonry path, leaving a total of four footprints, one of which is still half a footprint, very fresh sole pattern I am not familiar with, the size is 44 yards, about height and weight, I don't know how I estimated, Uncle Liu, you can take a look."

Liu Yongxin put on his glasses, looked at the photos and videos carefully, slowed down, observed carefully, and finally held the printed footprint picture, stood at the window, and slowly said after a while:

"I'm not familiar with the pattern, but there is one thing I don't know if you have noticed, these shoes are ninety percent new, but the outside of the left heel is more worn than the right heel, and the footprint of the right foot is deeper."

Da Zhao nodded and leaned next to Liu Yongxin.

"I found that people who play football or play confrontation sports all year round will have a difference in the strength of their left and right feet, and there will also be a shift in the center of gravity, of course, trauma, pelvic anterior tilt, scoliosis will also cause such a gait, but just four footprints, not a marching state, I can't give an accurate judgment."

Liu Yongxin shook his head.

"Although it is not a marching state, among these four footprints, two of them were left by him squatting, according to Xiaoqu, no image was found that went in and out, and this person didn't know when Zhou Ning went home, so he needed to squat for a long time, who could squat in place and leave only four footprints?

According to normal calculations, we got off work at 17:30, and Zhou Ning's earliest arrival home was at 17:45. ”

"When I arrived at the hospital at 23:47, Lao He said that when he heard a bang, he rushed downstairs, and when he saw Zhou Ning lying on the ground, he shouted Zhou Xiaoyu, and sent Zhou Ning directly to the hospital without delay, and it took ten minutes, so the time of the accident was around 23:37."

"According to you, the time of the accident is 23:37, so how long is it between 17:45 and 23:37? Besides, you can't step on it, it means that you have been squatting for at least six hours, and you can squat here motionless for so long? ”

Da Zhao thought for a moment, made a squatting motion, and then shook his head.

"My weight, let alone squatting for six hours, even if I squat for ten minutes, my legs will be numb, and if I can do it without eating or drinking for six hours, can I still not go to the toilet? But Uncle Liu, do you think he will know when Zhou Ning will go home, so that the temporary layout will be fine, and there will be no need to squat for so long. ”

Liu Yongxin frowned, thought about it and denied it directly.

"I thought about this before, the time for you to interrogate Liu Tiesong with the Xu Bureau yesterday is very uncertain, and there are not many people who know when you will end, just a group of these people, as well as some people from the laboratory department and a large team of the criminal police detachment.

Oh yes, there are also Hu Ju and Xu Ju, the possibility of leaking the news is very low, of course, unless someone can investigate, without knowing it, the accuracy of analyzing the time of Zhou Ning's return can be greatly reduced. ”

Da Zhao shook his head vigorously.

"There weren't many people inside yesterday, one by one, and it was impossible to leak this, Uncle Liu, you said is it possible, after he found a good position, he didn't squat here, but found a position to observe the situation of Qinda Road, after all, at the end of this road, there are two communities related to Qinda."

Liu Yongxin thought about it.

"Don't guess, you take someone to the scene again, check every location, I think this analysis is quite reliable, I found that Zhou Ning's car was approaching, so I ducked to the bushes in the garden and waited for an opportunity to act.

By the way, if you look at the part of the community that connects to the school, whether there is a broken guardrail, or the traces left by this footprint, and you can't find a means of transportation, that is, you are looking in the wrong direction.

Maybe it's not from the side of Qinda Road, after all, this is a sugar gourd-shaped road that only enters and can't leave, but all foreign vehicles can be seen at a glance, and if you climb the mountain from the school to the community, it is not impossible. ”

Da Zhao opened his mouth slightly, at this time Xiao Qu had already clicked on the map, and several people looked over, according to the map display, Xiao Qu was just about to pull down towards the location of the campus below, but was directly stopped by Da Zhao.

"Stop, we've been thinking about how to get there, isn't it more convenient to go through Fushan, so we just need to pass through the parking lot in the middle of the two communities, go around to the fence on the south side and the school, and turn over to go directly to the small garden, so that you can perfectly avoid all surveillance."

Kokoto glanced at it and drew a line on the map.

"Indeed, this can avoid patrol vehicles, and if you use a telescope to observe at the position of the mountainside, you can find that there are vehicles here that want to turn into Qinda Road, and quickly descend from the mountainside and reach the small garden, the time to climb over the guardrail can be delayed, and it will take less than ten minutes to be ready."

Da Zhao bit his lip, a little excited.

"Coming all the way from Qinda, here is an uphill slope, and there are two speed bumps, with Zhou Xiaozhou's cautious temperament, he is definitely slow enough, the car stopped in the parking lot, holding his bag and clothes, he also likes to wipe the reflector when he gets out of the car, and the ink is more than ten minutes away, I think this is more likely."

Liu Yongxin waved his hand.

"Then don't be stunned, hurry up and go to the scene to take a look, Xiao Peng, you can also go with you, can't you also check that literature on the road?"

I haven't returned to the unit yet, and no one praises me for the update sent by the roadside parking? (Tsundere face)

(End of chapter)