ADM-201 dump PMP dumps pdf SSCP exam materials CBAP exam sample questions

磁铁遇见血液 – 译学馆
未登陆,请登陆后再发表信息
最新评论 (0)
播放视频

磁铁遇见血液

Monster magnet meets blood...

嗨!在我最新的视频中 尤其是取出强力磁铁时
Hi! One of the questions I most commonly receive
被问的最多的一个问题就是
especially on my latest video where I unbox some extreme magnets
我们的血液中含铁
With the iron in our blood,
触碰如此强力的磁铁难道不危险吗?
isn’t it dangerous to handle such strong magnets?
在视频中 我将向你展示
In this video,I’ll show you
血液对磁铁会产生什么反应
how blood reacts to a magnet
并且解释为何它的反应如此奇怪
and try to explain why it reacts in such a strange way
这次我将使用强力磁铁和血液
This time I will handle powerful magnets and blood
如果你并不想看到血
If you don’t want to see blood
那么你可能选错了视频
you sort of picked the wrong video.
但是我会告诉你什么时候移开视线 好吗?
but I’ll tell you when to look away, OK?
好的 第一个问题:我们血液中含铁吗?
Alright, first of all: Is there iron in our blood?
是的
Yes, there is.
但并不像这些铁屑一样是固体金属碎片状的
But not as solid metallic piecesof iron like these filings.
如果是那样的话
If it was,
我们靠近磁铁时肯定会有麻烦
We would definitely be in trouble near a magnet.
让我用水和红色的食用色素来演示一下
Let me just demonstrate with water and red food coloring.
在没有加入铁屑的情况下
Without iron particles
血液顺畅地顺着管子流动并经过磁铁
The blood runs smoothly through the tube and past the magnet.
然而 当我加入一些铁屑时
However, when I add solid iron particles.
这些铁聚积在一起形成了一个凝块
The iron builds up and forms a clot
铁屑在磁铁周围聚积并形成了一个凝块
near the magnet in the simulated blood vessel.
这会让你很糟糕!
This would give you a bad day!
幸运的是 就如前面所提到的那样
Luckily, as mentioned,
真正血液中铁并不是这样存在的
iron is not present like this in real blood.
相反它是金属血红蛋白大分子的一部分
Instead it is part of a big molecule:The metalloprotein hemoglobin.
血红蛋白就是红细胞中红色的部分
Hemoglobin is the red part of red blood cells
它负责把氧气输送至全身
and it is responsible for carrying oxygen around your body
并将二氧化碳从身体中运输走
and removing carbon dioxide from it.
血红蛋白是非常复杂的分子
It is a very complex molecule.
相比之下 我们的血液中大概一半是水
For comparison around halfof our blood is just water.
水分子由两个氢原子和一个氧原子组成
A water molecule is made of two hydrogen atoms and one oxygen atom.
它的化学表达式是:H2O
giving it the chemical formula: H2O
一个简单且易记的分子
A simple and easy to remember molecule.
相反 血红蛋白就要复杂的多
Hemoglobin on the other handis way more complicated.
它的成分有……等会 让我来捋一捋
It is made of…Hold on, let me get this right…
2952个碳原子
2952 carbon atoms
4664个氢原子
4664 hydrogen atoms
832个氧原子
832 oxygen atoms
812个氮原子
812 nitrogen atoms
8个硫原子
8 sulphur atoms and…
和4个铁原子 只有四个
4 iron atoms. 4 atoms.
我们的血液中不是充满铁的
Our blood isn’t exactly crammed with iron.
对于一般人来说 体内铁总量约是4g左右
For an average human body the total amount of iron is around 4 g
血液中只含2.5g
2½ g in the blood.
但任何含铁的物质都意味着会具有磁性吗
But does any iron content mean that the material will be magnetic?
让我们用含铁量不同的常见物来试验一下
Let’s test some common materials with different amounts of iron content.
首先是火柴
First up is matches.
火柴中含有微量的以氧化铁形式存在的铁
These contain a tiny amount of iron as ferric oxide.
是火柴头中的杂质
An impurity in the match head.
其含铁量不足以让它们吸附在磁铁上
Not enough iron to have them stick to a magnet
但是在灵敏的水浴上 它们会被磁铁微微的吸引
but on a sensitive water bath they are sligtly drawn towards the magnet.
现在 我通过点着它们
Now, if I do some chemistry to them
让他们产生一些化学反应 情况就改变了
by setting them on fire, something changes.
火柴中的含铁量没有变
There’s the same amount of iron atoms in the matches
但是在燃烧过程中 氧化铁还原成铁
but the ferric oxide was reduced to pure magnetic iron in the fire.
这就提示我们:
This gives us a clue:
铁原子也并不是总是具有磁性
Iron atoms don’t always have the same magnetic properties.
它的磁性取决于整个分子的结构
It depends on the whole molecule.
即使叉子是由大部分都是铁的不锈钢的做的
Even this fork made of stainless steel which is mostly iron.
仍会根据测试中位置产生不同的磁性反应
has different magnetic reactions depending on which in test
不锈钢内的元素可以形成不同的晶体结构
The elements in stainless steel can form different crystalline structures
对叉尖冷处理能稍微改变这种晶体微观结构
The cold work done to the tines changed the crystalline microstructure slightly
使叉尖比叉柄部分磁性更强
making them more magnetic than the handle.
叉子中的铁远高于火柴和血液
Still not very magnetic even though there’s a lot of iron in this fork.
但即使叉子中有很多铁 它磁性仍然不强
So much more than in any matches and blood.
好的 基于以上实验
Alright, based on these tests,
你能猜出血液对磁铁会有什么反应吗?
Can you guess how the blood will react to a magnet?
如果你对晕血的话
This is where you should look away
这个地方就跳过去吧
if you are sensitive to seeing blood.
我将打开一个装有3升血的桶
I’m about to open a bucket with 3 liters of it.
我不喜欢放血 所以我去了当地的屠户家
I don’t like to bleed so I went to the local butcher.
买了些可食用的猪血来代替
and bought some food-grade blood from a pig instead.
完美!
Perfect!
让我们马上用强力磁铁来测试一下
Let’s test it with the monster magnet right away.
这块磁铁的磁性非常强
This magnet is insanely strong
但我并没看到血液中有任何移动
but I don’t see any movements in the blood.
我们用更少量的血置于敞口水浴中来试验
Let’s use a smaller amount on the revealing water bath.
首先我将用空的容器作为对照组
As a control test I will test the empty container first.
看上去产生的反应可以忽略不计
Seems neutral enough to be negligible.
是时候把它加满了 但不能弄得太脏乱
Time to fill it up without making too much of a mess.
让我们开始吧!
Here we go!
你猜到它的反应了吗?
Did you guess how it reacts?
嗯……和我想的不大一样
Hmm…not what I expected.
它似乎和磁铁相斥
It seems to be repelled by the magnet.
说实话 稳稳地拿着12千克的磁铁有点难
I honestly have trouble holding this 12 kg monster steady
所以我们用更轻的球形磁铁来确认一下
so let’s confirm with the lighter sphere magnet.
是的 血液的确和磁铁相斥
Yes, the blood is definitely repelled by a magnet.
这被称作抗磁性反应
This is called a diamagnetic reaction.
但血红蛋白中有铁 怎么可能发生这样的反应呢
But how is this possiblewith iron in the hemoglobin?
其实 磁力是放大到我们可观察到的
Well, magnetism is a quantum-mechanical effect
量子力学效应
scaled up to be noticeable to us.
但量子力学不能很好地用常规逻辑来计算
Quantum mechanics however does not compute well with our everyday logic.
简单的说 量子力学就是
Very simplified, magnetism is an interaction
未配对电子在物质运动中的相互作用
between unpaired electrons moving in the materials.
成对的电子通过原子或分子内部的
Paired electrons will sort of cancel out their magnetic dipole moment
反向旋转 会抵消它们的偶极矩
by having opposite spins in the atoms and molecules.
只有未配对的电子才会有
Only unpaired electrons will have a net magnetic moment
超过原子和分子的净磁运动
reaching beyond the atoms and molecules.
所以粗略地说 我们可以通过
So roughly speaking we can determine the magnetic reaction
数未配对电子的数量来确定原子
of an atom, molecule or crystalline structure
分子或晶体结构的磁性反应
by counting the number of unpaired electrons in it.
血红蛋白中 铁原子中的未配对电子数
In hemoglobin, the number ofunpaired electrons in the iron atoms actually change
会因铁原子是否被氧化而改变
depending on whether it is oxygenated or not.
每个脱氧血红蛋白中的铁原子有四个未配对电子
The iron atoms in deoxygenated hemoglobin each have 4 unpaired electrons
使它具有顺磁性并且能够被磁铁吸引
making it paramagnetic and a little attracted to a magnet.
氧化血红蛋白中的铁原子只有配对电子
The iron atoms in oxygenated hemoglobin turn out to have only paired electrons.
没有未配对电子
No unpaired.
这就使得氧化血红蛋白具有反磁性
This gives oxygenated hemoglobina diamagnetic reaction.
不管含铁量是多少 它都与磁相排斥
It is repelled by a magnet despite the iron content.
氧化血红蛋白与脱氧血红蛋白的比例
The ratio between oxygenated and deoxygenated hemoglobin
正如屏幕中所显示的那样
is typically like shown on the screen.
血液中大多血红蛋白是与磁铁相斥的
Most of the hemoglobin in our blood is the
反磁性的氧化状态
diamagnetic,oxygenated state being repelled by a magnet.
由水构成的另一半血液也是反磁性的
Water making up half of our blood is also diamagnetic.
所以 血液和磁铁相斥
So after all, it does make sense that
是有道理的
the blood is repelled by a magnet.
结论就显而易见了:
The conclusion is clear to me:
当在磁铁周围时 不要担心你血液含铁
Do not worry about the iron content in your blood near a magnet.
即使是最强力的磁铁 如磁核共振扫描仪的
Even the strongest magnets – like the superconducting electromagnets
超导电磁 也不会产生任何问题
in MRI scanners will not be a problem.
血液中的铁不是以强磁性的状态存在的
The iron is not in a ferromagnetic state in the blood.
希望你在这期视频中学到了新的东西
Hope you learned something new in this video.
我为这个视频也做了研究
I certainly did researching for it.
说到学习 我有一些好消息要告诉你们
And speaking of learning,I’ve got some good news for you.
我发现学习最好的方法就是动手
I’ve found that the best way to learn more is to get my hands dirty
做一些有趣的实验——其中有些我已经分享过了
and do some interesting experiments – some of which I have shared.
但你可能弄不到一些东西
But you may not have access to
比如 大型的钕磁铁
for example, big neodymium magnets
所以能做些什么?
so what else can you do?
我的新赞助商 Brrilliant.org 是个解决问题的网站
My new sponsor, Brilliant.org is a problem-solving website
它会通过你做自己设计的实验
that teaches you how to think like a scientist
来教你如何像科学家一样思考
by performing your own thought experiments.
它们课程中我最喜欢的就是
What I like the most about their lessons is that
它们会一步步引导你思考
they guide you through the thinking step by step
所以你可以独自得出这些惊人的结论
so you can work out the stunning conclusions on your own.
我是科学的忠实粉丝
I’m a fan of science
并且喜欢学习更多关于科学的东西
and always like learning more about it.
如果你像我一样 那么我强烈推荐你
If you are like me then I highly recommend
去Brilliant.org或Brainiac75免费注册
you go to Brilliant.org/Brainiac75and sign up for free.
作为福利 前200个点击这个链接的
As a bonus, the first 200 people using the link
在订阅年度会员时会有20%的折扣
will even get 20% off theannual Premium subscription.
你可以在没有我的安全警告的情况下
That allows you to do more crazy stuff
做更多疯狂的事
without any safety warnings from me.
感谢观看!
Thank you for watching!
希望你喜欢这个视频并点赞
Hope you liked the video enough to click thumbs up
如果你是第一次观看 你可以订阅
and maybe even subscribe if you are new here.
下期再见!
See you in the next one!

发表评论

译制信息
视频概述

我们的血液中含铁,所以当我们接近磁铁时会有危险吗?磁铁和血液又能碰撞出怎样的火花呢?

听录译者

收集自网络

翻译译者

Selina

审核员

审核员SX

视频来源

https://www.youtube.com/watch?v=IVsWTkD2M6Q

相关推荐