p*****e
发帖数: 560 | 1 Charles-Valentin Alkan是李斯特同时期的钢琴家，作为作曲家的名声一直不大，他的
作品的录音一直寥寥，最近二十年才逐渐有了一些热度。他的单钢琴协奏曲Concerto f
or solo piano是一套12首小调练习曲Op.39中的三首，虽然叫练习曲但是篇幅非常巨大
，弹下来大约要50分钟，经常被单独拿出来演奏。Alkan在这首作品里用超人的技术在一
架钢琴上模拟出钢琴和乐队的音色和竞奏效果，不论是技术性，旋律性还是音响效果都
十分精彩，有喜欢钢协或者李斯特钢奏的同学推荐一定要听一听，最好是从imslp找来谱
子对着听。我前天晚上对着谱子听了Hamelin在Hyperion录得第二版，夸张点说都不敢相
信这是人类力所能及的演绎了。
Youtube上有几个这个作品的录音，Hamelin，Gibbons，Smith，Ogdon的都挺有名气，还
有Hamelin在东京的现场录像，可以观摩一下手部的动作。我之前提到的hamelin第二版
可以用emule在verycd下：www.verycd.gdajie.com/topics/243481/ |
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发帖数: 1 | 2 细胞色素P450 CYP450不能切断alkane链嘛
[在 gatecher (WayneClough) 的大作中提到：]
:并不是断言有类似功能的酶不可能存在，只是目前看来无限制性的水解不大可能存在
。或许具有在特殊条件下能水解alkane链的酶，只是尚未发现。条件例如：需要
cofactor,只能作用于特异长度/位点，存在pH或温度要求，严格受regulator/
inhibitor制约。 |
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发帖数: 1 | 3 细胞色素P450 CYP450不能切断alkane链嘛
[在 gatecher (WayneClough) 的大作中提到：]
:并不是断言有类似功能的酶不可能存在，只是目前看来无限制性的水解不大可能存在
。或许具有在特殊条件下能水解alkane链的酶，只是尚未发现。条件例如：需要
cofactor,只能作用于特异长度/位点，存在pH或温度要求，严格受regulator/
inhibitor制约。 |
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发帖数: 1 | 4 AlkB and CYP153 are important alkane hydroxylases responsible for aerobic
alkane degradation in bioremediation of oil-polluted environments and
microbial enhanced oil recovery. |
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S*****n
发帖数: 6055 | 5 I am listing my answers to the differences b/w gasoline and diesel powered
vehicles. I hoped to get more input but unfortunately did not see much.
Anyway I will offer baozi to the first 3 IDs who tried to answer.
1. Composition: the molecular weight of gasoline (C5-C9) is lower than
diesel (C9-C18). So in gasoline we use octane number but in diesel we use
cetane number. They both contain alkanes, alkenes (refineries try to reduce
alkenes), cyclics and aromatics. Alkanes (including cycloalkanes) ... 阅读全帖 |
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r*****y
发帖数: 3406 | 6 Sigma doesn't do it anymore.
I need some radioactive labeled alkane
I contacted IDT Australia, but they asked me to provide the method...
I have no idea how to label chemicals, sigh |
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t****t
发帖数: 208 | 7 不要迷惑人：
Propane Properties and reactions
Propane undergoes combustion reactions in a similar fashion to other alkanes
. In the presence of excess oxygen, propane burns to form water and carbon
dioxide.
C3H8 + 5 O2 → 3 CO2 + 4 H2O + heat
propane + oxygen → carbon dioxide + water
When not enough oxygen is present for complete combustion, incomplete
combustion occurs when propane burns and forms water, carbon monoxide,
carbon dioxide, and carbon.
2 C3H8 + 7 O2 → 2 CO2 + 2 CO + 2 C + 8 H2O + heat
Pro... 阅读全帖 |
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f*******r
发帖数: 5301 | 8
alkanes
When not enough oxygen is present for complete combustion：
先不用关心CO, 缺氧就足够挂掉了。
室内用propane/butane炉子做饭都是安全的
好点的过夜睡觉的propane heater带oxygen sensor，氧气不足可以自动关闭。
如果实在不放心，家里还有CO monitor |
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B****m
发帖数: 63 | 9 Microbial Biosynthesis of Alkanes |
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g*********d
发帖数: 233 | 10 Genetic history of an archaic hominin group from Denisova Cave in
Siberia
David Reich, Richard E. Green, Martin Kircher, Johannes Krause,
Nick Patterson, Eric Y. Durand, Bence Viola, Adrian W. Briggs, Udo
Stenzel, Philip L. F. Johnson, Tomislav Maricic, Jeffrey M. Good,
Tomas Marques-Bonet, Can Alkan, Qiaomei Fu, Swapan Mallick, Heng
Li, Matthias Meyer, Evan E. Eichler, Mark Stoneking, Michael
Richards, Sahra Talamo, Michael V. Shunkov, Anatoli P. Derevi... 阅读全帖 |
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s******9
发帖数: 283 | 11 很灵敏，毕竟是covalent labelling，但是看你在哪里用：
如果这种植物里有chloro-alkane相似的metabolites，而且你的蛋白表达量较低，检测
就会有问题。 |
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发帖数: 1 | 12 你的意思是hydrolysis of alkane? 如果有这样的酶，各种membrane 得有多不稳定？ |
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发帖数: 1 | 13 要hydrolyze alkane, 首要是造出Leaving group。理论上可以尝试改造
haloperoxidase或halogenase。 |
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发帖数: 1 | 14 energy barrier并不是最主要的问题，因为酶催化反应本也没有确定的能级上限。一些
酶如lignin peroxidase催化的反应在energy barrier的角度看就已经难以置信。关键
是无限制水解alkane chain的反应对生物系统没有实际意义。有这种催化功能的酶如果
存在，它就会攻击各种膜层的疏水部分。造成的后果完全是破坏性的。 |
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发帖数: 1 | 15 并不是断言有类似功能的酶不可能存在，只是目前看来无限制性的水解不大可能存在。
或许具有在特殊条件下能水解alkane链的酶，只是尚未发现。条件例如：需要cofactor
,只能作用于特异长度/位点，存在pH或温度要求，严格受regulator/inhibitor制约。 |
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发帖数: 1 | 16 你的意思是hydrolysis of alkane? 如果有这样的酶，各种membrane 得有多不稳定？ |
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发帖数: 1 | 17 要hydrolyze alkane, 首要是造出Leaving group。理论上可以尝试改造
haloperoxidase或halogenase。 |
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发帖数: 1 | 18 energy barrier并不是最主要的问题，因为酶催化反应本也没有确定的能级上限。一些
酶如lignin peroxidase催化的反应在energy barrier的角度看就已经难以置信。关键
是无限制水解alkane chain的反应对生物系统没有实际意义。有这种催化功能的酶如果
存在，它就会攻击各种膜层的疏水部分。造成的后果完全是破坏性的。 |
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发帖数: 1 | 19 并不是断言有类似功能的酶不可能存在，只是目前看来无限制性的水解不大可能存在。
或许具有在特殊条件下能水解alkane链的酶，只是尚未发现。条件例如：需要cofactor
,只能作用于特异长度/位点，存在pH或温度要求，严格受regulator/inhibitor制约。 |
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S*****n
发帖数: 6055 | 20 不一定啊。。。combustion还是有不少人是做实验的
像我们组做methane oxidation的催化剂开发，还有alkane combustion的kinetics |
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S*********n
发帖数: 521 | 21 是不是读11年也没法毕业，毕业了找不到工作，或者得癌症啊，哈哈
不一定啊。。。combustion还是有不少人是做实验的
像我们组做methane oxidation的催化剂开发，还有alkane combustion的kinetics |
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y**********3
发帖数: 339 | 22 Introduction 1
Chapter 1 Solution
Chapter 2 the Halogens
Chapter 3 Structure of Matters
Chapter 4 Chemical Reaction Rates and Equilibrium
Chapter 5 Electrolyte Solution
Chapter 6 Coordination Compounds
Chapter 7 Oxidation-Reduction Reactions (Redox Reaction)
Chapter 8 the Group 6A and 5A Elements
Chapter 9 Introduction to Organic Compounds
Chapter 10 Alkanes
Chapter 11 Cycloalkanes
Chapter 12 Alkyl Halides
Chapter 13 Alcohols, Phenols and Ethers
Chapter 14 Aldehydes and Ketones
Chapter 15 Carbox |
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i***e
发帖数: 1 | 23 I am looking for an online resource which not only lists all names and
concepts in chemistry (like a dictionary), but also gives relationships
between them (e.g., Alkanes belong to the category of organic compounds;
organic compounds belong to organic chemistry).
Wikipedia seems to a good source, but I am wondering if there are other
alternatives that have better coverage and accuracy? Any pointers are much
appreciated!!! |
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y*****s
发帖数: 1047 | 24 it is basically an alkane pKa ~51 |
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y*****s
发帖数: 1047 | 25 it is basically an alkane pKa ~51 |
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t***u
发帖数: 20182 | 26 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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j**i
发帖数: 419 | 27
a little bit,not very.
more expensive than petroleum ether(shi You mi)
-mixed alkanes from SHI YOU
,but still not expensive bah.
you can find its industry price.
I am not very clear here.
if in china ,I know how to search.:) |
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a********h
发帖数: 819 | 28 You must have bought it in IRA.
I am up on AVL 140%, but I hate short term returns.
I got a small slice of great western and quest yesterday, both heavy REE
the reason I bought quest is that they will be uplisting in US soon.
Alkane also have heavy REE, and cheap price too, like LYSCF.
I guess Aussies are conservative people.
I am hoping that both will start running sooner than later. |
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a********h
发帖数: 819 | 29 You must have bought it in IRA.
I am up on AVL 140%, but I hate short term returns.
I got a small slice of great western and quest yesterday, both heavy REE
the reason I bought quest is that they will be uplisting in US soon.
Alkane also have heavy REE, and cheap price too, like LYSCF.
I guess Aussies are conservative people.
I am hoping that both will start running sooner than later. |
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