Magic mirror composition 1 noon is the science teacher's class, which is the most exciting time for everyone. Because we want to observe the epidermal cells of onions with a microscope.
I came to the laboratory with great interest, took my positions and performed very well. Everyone wants to get this "magic" microscope as soon as possible.
Finally got it! I carefully took the experimental materials, put them on the table, and couldn't wait to start making onion skin specimens. After Zhang Xinzhi sliced the onion, I grabbed the sliced onion and peeled it off. But my fingernail was pinched into the onion, and a stream of onion juice came out like lightning, which burned me for a long time. I kept wiping my eyes with paper, but the pain was unbearable, so I had to give this task to Zhang Xin in the same group. I became a "cyclops" and watched Zhang Xin's onion performance: he gently clamped a corner of the epidermis with tweezers and pulled it, and a layer of "onion skin" that felt like plastic came down.
We are much slower than other groups, so we speed up, but with this speed, the quality drops. When using the slider, the onion skin was pulled in half and the hands were covered with red ink. But for the experiment, you can do whatever it takes. Girls who love cleanliness and quiet don't care about their personal image, and even red ink splashes on their faces. They didn't care so much, smiled and wiped their hands, and then continued to do the experiment.
Zhang Xinzhi and I observed the teacher's standard image, and then observed our own onion skin, but it was completely different from the teacher's! We thought it was the lack of brightness and the wrong position, so we pointed the microscope at the window and the warm sunshine shone in. It's bright enough, but it's the same The epidermal cells in the image are intertwined at sixes and sevens, and there is no regularity at all, which makes me see things in a blur.
What happened? The brightness and position are correct. Why is it different from the teacher's I thought the onion skin was too thick or old, so I changed it again, and it was still very vague. I fiddled with the microscope several times, but I still didn't understand what was wrong. At this time, Zhang Xinzhi "moved" the science teacher, or the teacher was fierce. I knew there was something wrong at first sight. No wonder you can't see clearly every time you adjust the focal length! The teacher adjusted the focus for us before watching. Cells are really beautiful! The red onion skin cells are flocculent and arranged in rows. We use high-pixel mobile phones to take pictures of cells in the microscope.
From then on, the scene under that beautiful microscope will be fixed in our minds forever.
Magic microscope composition 2 Today, Gan Ruoyi's father invited us to do an experiment, which showed me the magic of the microscope.
The microscope is about 30 cm high, which is very inconspicuous. Father Gan told us that the three cylinders, called objective lenses, can be adjusted in different multiples, including 100, 50 and 20 times. Thin things such as screws on the side are used to adjust the position of the observed object, and the spiral things on the top are used to adjust the up and down position of the cylinder. The lower one is slightly smaller and has the same function, but the upper one is coarse and the lower one is fine. The speed of rising and falling is very fast in coarse adjustment, but much slower in fine adjustment.
Then, Dad Gan took out the onion specimen, and we observed that it was a small piece of lavender, only as small as mung bean.
Next, we will do it ourselves. I first put the specimen on the microscope stage, adjusted the position of the specimen, moved it up and down, left and right, and finally adjusted it. At first glance, hey, why is it still a vague purple thing? Initially, it is necessary to adjust the position of the microscope objective up and down. I made a rough adjustment first. Ah, that's much better. You can see some diamond-shaped purple objects. I adjusted it again. Oh, finally adjusted. It's too clear You can also see some thin elements on the diamond. It seems that we can't underestimate this microscope.
Forrest Gump's dad said the next target was a human blood sample. One by one, we acted scared, but in fact, we wanted to see what happened. After research, I found that there are many little red dot in human blood. Gan's father said it was red blood cells, and it was light red around, which was very light.
I also observed mosquito specimens. On weekdays, when we saw a mosquito 1 cm long, we all exclaimed: "mosquito king!" " "Now, I see mosquitoes, just the head, as big as a dollar coin, so scary! It has a light yellow body, a big head and a small body. There is a lot of blood on the forehead, which is purple. I observed it for a long time before I found its eyes were black. They are very small even under a microscope. Alas, why can such small eyes accurately find that we children are always sucking our blood?
These are invisible to our naked eyes, and only with this magical microscope can we find them!