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Wrongful Souls on the River Beach ¡¤ Eighty-three

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    At present, the tire marks of the suspect vehicle have been determined, so the turning direction of the vehicle may be the murderer's dumping point. Physical evidence related to the case may be found here, such as the most common cigarette butts, saliva spots, etc.

    At Brother Ming¡¯s call, we trotted all the way and found a location on the river dam where the collapse was serious. The broken soil extended to the north, forming a slope that led directly to the river.

    Looking at the slope covered with withered grass in front of me, I felt indescribable, because in this environment, there was no way to leave any footprints.  I originally thought that I could analyze some characteristics of the perpetrator from the shoe prints, but it seems that this idea can only go to waste.

    "Brother Xian, have you found any cigarette butts or anything?" I placed my hope on Lao Xian.

    The old man shook his head like a rattle: "It is estimated that the suspect threw the body from this place and left directly. There is nothing here except grass."

    "Ah!" Ye Qian suddenly shouted at this time.

    "What's going on?" I was the first to run up to her and asked.

    "Ants! So many ants!" Ye Qian stood on the ground and stamped her feet vigorously, looking like a frightened little girl.

    "Oh, let me go, are you still afraid of this? And you know that we are surveying the site outdoors, and you are wearing sandals, aren't you looking for excitement?" I said jokingly.

    "You!" Ye Qian blushed and pointed at me with her finger.

    "Ants?" Lao Xian had no intention of watching us play tricks. He picked up a magnifying glass and squatted on the ground to study the pile of black ants.

    "Brother Xian, you are still a child at heart, are you going to use a magnifying glass to roast ants for fun?" Fat Lei was so hot that he used his hand as a fan and kept fanning himself.

    "That's right, Brother Xian, what can you observe? Aren't there ants everywhere in summer?" I walked over to him and squatted down.

    In summer, when the temperature is high, food molecules will diffuse in the air, which will stimulate ants. In addition, ants are very sensitive to temperature, so summer is the season when ants are most active. You can see groups of ant colonies on the roadside.  , is a completely normal thing. I really don¡¯t understand why Lao Xian is so interested in this group of ants.

    "Look, these ants are carrying the sand on the ground!" Lao Xian put the magnifying glass in front of me and said.

    "Do you still have the mind to study this? Go back quickly, it's so hot here, and I haven't finished watching the surveillance video yet." Fat Lei urged painfully from the side as the sweat on his face flowed down.

    "No! Under normal circumstances, ants will not carry sand and soil, because in summer, the main purpose of worker ants is to look for food, and they will not carry things that are inedible." Brother Ming saw something fishy.

    "Brother Ming, are you saying that there is something in the sand that ants think is edible?" I seemed to understand something.

    At this time, Lao Xian did a very strange move. He lay directly on the ground, with his butt raised high, his nose close to the ground, and sniffed hard.

    "What does it smell like?" I asked curiously.

    "It's urine!" Lao Xian's words surprised us beyond measure.

    "Urine?"

    "Is it human urine?" Before I could finish my words, Fat Lei asked this very tricky question.

    Yes, if this is really urine, it may have been left by the suspect, because the slope is very steep and it seems from the surrounding environment that no one would come here.  And we found that this location is almost to the river, and most people would not choose this place to pee.

    If this urine is really left by the suspect, then it is possible to detect the suspect's DNA. Normal people usually contain more than 400 cells per milliliter of urine, including red blood cells, white blood cells and epithelial cells, sometimes mixed with  There are sperms, so DNA can be detected in urine, but the premise is that it must be human urine. If it is left by puppies and kittens, there is no value in extracting it.

    "These ants can tell you whether it is human urine." Lao Xian replied angrily, as if Fat Lei's words insulted his research field.

    "What? Ant can tell me?" Pang Lei asked carelessly.

    "Ants like sweets and are very sensitive to sweet taste. At the same time, ants have very poor eyesight, and some ants are even completely blind. They rely on their antennae and gas molecules to find food. The fact that they transport the sand shows that the sand contains some kind of  Things they think are edible. Just now Guoxian analyzed that this place was probably a pool of urine before. There is only one possibility that can make ants behave like this." When Ming Ge said this, he raised his index finger.  .

    "Those who pee havediabetes?  ¡°I have been taught this knowledge by my father since I was a child, so I was the first to react.

    "Yes! This person is a diabetic!" Brother Ming slightly raised the corner of his mouth to me, very appreciative.

    "Cats and dogs also have diabetes, but the proportion is very small. Although a few days have passed since the case, I can still smell the smell of human urine." Lao Xian lay on the ground and sniffed again.

    "You win!" Pang Lei gave him a thumbs up.

    "It's been so many days and the urine has seeped into the ground. Can we still test the suspect's DNA?" I asked with some worry.

    "There is grass all around. The grass roots themselves are water-absorbent. They can store up all the water around them. I am not worried about not being able to find urine. I am afraid that the protein in the urine will be denatured." Lao Xian is indeed very professional.  , this makes perfect sense.

    "Protein denaturation?" Ye Qian finally couldn't hold it any longer.

    "Yes. To put it bluntly, the cells contained in urine are biological proteins. High temperature will denature the protein, which means the physical and chemical properties and biological activity will be lost. If the protein is denatured, the DNA information contained in it cannot be detected. Now it is outdoors  The temperature is so high, and the specific heat capacity of the ground is small (specific heat capacity is the heat capacity of a unit substance, that is, the internal energy absorbed or released when an object of unit mass changes unit temperature). In the case of direct sunlight, the ground heats up very quickly. I am very scared.  These cells will denature due to excessive temperature." Lao Xian said worriedly.

    "Try to take back as much soil as possible. Even if we can't extract DNA, we have a rough grasp of a direction. If the urine was left by the suspect, as long as we find a diabetic patient in the circle of the deceased, he may be the suspect.  , this is much better than having no grip at all." Brother Ming patted Lao Xian on the shoulder and comforted him.

    Lao Xian nodded and began to collect soil samples from the group of ants.  (Remember the website address: www.hlnovel.com
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