k***n
发帖数: 849 | 1 我粘了不少胶皮，没见着什么不平么。Thinner成分就是n-heptane，一般rubber
cement里面就含这个。我就用到最后的时候，n-heptane挥发光了，就觉得有点厚。 |
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d*******o
发帖数: 171 | 2 brake cleaner contains either tetrachloroethane or acetone/heptane, which
are not good to paint. Easy-off is similar to grill cleaner from Sam's. |
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l******o
发帖数: 1864 | 3 我是制药的，hexane（己烷）因为比较毒，所以最后药物检验时要求含量很少。为了减
少除hexane（庚烷）的费用，我们现在化学合成的时候都改用heptane了。说明正规食
品和药品都设有hexane含量标准，超标了不合格的。至于厂家使用hexane提取，最后要
花钱再除hexane，那是他们自己的事。 |
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l******o
发帖数: 1550 | 4 是因为计算标准不一样的，作者自己在忽悠人
from wiki
The most common type of octane rating worldwide is the Research Octane
Number (RON). RON is determined by running the fuel through a specific test
engine with a variable compression ratio under controlled conditions, and
comparing these results with those for mixtures of isooctane and n-heptane.
There is another type of octane rating, called Motor Octane Number (MON) or
the aviation lean octane rating, which is a better measure of how the fuel
behaves when under lo |
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t**********d
发帖数: 638 | 5 most of the people in US know most of the words you mentioned here. In fact,
there are pre-fix and post-fix (?) in lots of words. When you know the
meaning of the stem-word, you know all of them. for example, butane, pentane
, hexane, heptane, octane..., legal, illegal; known, unkown; lz needs to
lean more English in order to 触类旁通.
let me tell you what I know about the words you mentioned here: hallination,
“四环素” (I do not think people use this here)、“变阻器” (variable
resistor), calcium carbonate, |
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t*****z
发帖数: 1598 | 6 我在采集果蝇卵，固定，染色。固定的这一步骤需要用到甲醇、甲醛、庚烷（heptane
），每次一个小时左右，频繁的时候每天都要坐上两次。我吸入这个气体之后就有不良
反应，头痛、乏力等等。我想采取某些措施来减少实验的伤害，比如存放庚烷的瓶子里
面用水或者什么的封在上面，不让庚烷蒸汽溢出。不知各位果蝇界的同道有什么好办法
，可以轻松开心地做这个固定实验呢？先谢谢大家。 |
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s******s
发帖数: 13035 | 8 比较敏感就用hood啦。像我不敏感的收集1hr embryo的时候
一天做个七八次也没觉得啥。我老板一个朴刀同事当年对果蝇
过敏，最后被迫转行
heptane |
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f******e
发帖数: 125 | 10 【 以下文字转载自 Chemistry 讨论区 】
发信人: firelane (beaver), 信区: Chemistry
标 题: silanization of coverslip
发信站: BBS 未名空间站 (Fri Sep 3 11:45:56 2010, 美东)
I saw some protocols using waters solution of silane to do the silanization
and some protocol using acetone or heptane solution. I am wondering which
one is better.
Thanks a lot
Sorry that I could not type in Chinese in lab. |
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f*****y
发帖数: 116 | 11 实验室需要做一个实验，要配以下溶液， 60% n-heptane+20% toluene + 20%
absolute ethanol
是用来模拟地下水的，必须在室内进行（要温湿度可控）。我们实验室本没有执行此实
验的资质，但是经理非要做。据我所知这三种材料混合是有爆炸性的，我们实验室没有
fume hood。请问熟悉化学的各位朋友知不知道这液体的爆炸性有多大？（我们要配大
约1升混合液体，盖盖子存放一周时间）
谢谢啦！ |
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w*s
发帖数: 50 | 12 n-Hexane is indeed toxic, it is oxidized metabolites hexane-2,5-dione that
causes CNS break down. Pentane is less toxic, but too volatile. So use
heptane whenever you can. |
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f******e
发帖数: 125 | 14 I saw some protocols using waters solution of silane to do the silanization
and some protocol using acetone or heptane solution. I am wondering which
one is better.
Thanks a lot
Sorry that I could not type in Chinese in lab. |
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s********g
发帖数: 252 | 15 刚从TCI买了一瓶(2.0 M in THF/Ethylbenzene/Heptane),是深红色的,做了一次反应,
失败了
不知道是不是LDA的问题还是别的什么问题
谢谢 |
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c****n
发帖数: 134 | 16 "aliphatic hydrocarbon" is listed in polymer handbook.
is hexane or heptane good?
thanks. |
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t***u
发帖数: 20182 | 17 我从来没做过啊。找个篇文献，应该可以找到更多的。hexane boiling point 69oC,
THF 66, 不知道
能不能行。
n-Alkanes (heptane, octane, decane, and dodecane), N,N1-dimethylformamide,
N,N1-dimethylacetamide, and methyl ethyl ketone used
as selective solvents for the block copolymers were of AnalaR grade.
The micellar solutions were prepared by using tetrahydrofuran un-
I less stated otherwise. The block copolymers were first dissolved in
small amounts of tetrahydrofuran to which the selective solvent was
I subsequently added. Tetrahyd |
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a***n
发帖数: 5665 | 18 【 以下文字转载自 Racing 讨论区 】
发信人: leedstao (Senior), 信区: Racing
标 题: Re: 汽油标号的秘密（转载）
发信站: BBS 未名空间站 (Tue Jun 12 11:42:14 2007), 转信
是因为计算标准不一样的，作者自己在忽悠人
from wiki
The most common type of octane rating worldwide is the Research Octane
Number (RON). RON is determined by running the fuel through a specific test
engine with a variable compression ratio under controlled conditions, and
comparing these results with those for mixtures of isooctane and n-heptane.
There is another type of octane rating, called |
|
