h*******g
发帖数: 2201 | 1 唐教授是很不地道的.Nobody should be doing this.She should be kicked out of
her research field because this violation. She does not have the basic
humanity to be a scientist, even more shameful to do such thing to her own
race, like a 外F.
deuterium 对细胞的新陈代谢会产生很大的副作用(非放射同位素毒性),如果你是做NMR
,你会用E Coli表达蛋白, E Coli需要很长的时间才能适应deuterated water because
of the isotopic mass of deuterated water is significantly different than
proton water.
check here:
http://en.wikipedia.org/wiki/Heavy_water
Heavy water is not radioac... 阅读全帖 |
|
w***n
发帖数: 1084 | 2 有wiki你们都不会看吗？
http://en.wikipedia.org/wiki/Heavy_water
Because it would take a very large amount of heavy water to replace 25% to
50% of a human being's body water (which in turn is 70% of body weight) with
heavy water, accidental or intentional poisoning with heavy water is
unlikely to the point of practical disregard. For a poisoning, large amounts
of heavy water would need to be ingested without significant normal water
intake for many days to produce any noticeable toxic effects.
Oral doses ... 阅读全帖 |
|
F****8
发帖数: 289 | 3 汤光文的黄金大米paper用的是deuterium同位素标记，无放射性。这篇paper用
了68个小孩。（PubMed）汤的问题是对规则
的漠视，以及受试者的不知情。在这篇paper中，有以下声明：The study recruitment
processes and protocol
were approved by the Institutional Review Board–Tufts
Medical Center in the United States and by the Ethics Review
Committee of Zhejiang Academy of Medical Sciences in China.
Both parents and pupils consented to participate in the study.
但据说只让学生和家长看了知情书的最后一页。
Am J Clin Nutr. 2012 Sep;96(3):658-64. doi: 10.3945/ajcn.111.030775. Epub
2012 Aug 1.
β-Carotene... 阅读全帖 |
|
m***a
发帖数: 13878 | 4 看名字不像是三哥
(Reuters) - Lockheed Martin Corp said on Wednesday it had made a
technological breakthrough in developing a power source based on nuclear
fusion, and the first reactors, small enough to fit on the back of a truck,
could be ready for use in a decade.
Tom McGuire, who heads the project, said he and a small team had been
working on fusion energy at Lockheed's secretive Skunk Works for about four
years, but were now going public to find potential partners in industry and
government for thei... 阅读全帖 |
|
B******1
发帖数: 9094 | 5 School homework for a 7th grader: An Essay about Scientific Research and Its
Impact
- - - - - - -
Pave the Way for the Future
A few years ago while watching a documentary by Al Gore, I first heard of
global warming. We were living in San Diego, CA at the time. As you can
imagine, the idea of Southern California disappearing due to a rising sea
level was absolutely horrible to me. Global warming has started popping up
in the news more and more often since then. The culprit might be the
consumpt... 阅读全帖 |
|
H******7
发帖数: 34403 | 6 The device is 2x2x4 meters in size. It is cylindrical shaped. It has a
vacuum inside with high magnetic fields, made using electromagnets.
Uncharged deuterium gas is injected. It is heated using radio waves, in much
the same way a microwave heats food. When the gas temperature reaches over
16 electron-volts, the gas ionizes into ions and electrons. This plasma
exerts a pressure on the surrounding magnetic fields. This plasma pressure
is counterbalanced by the magnetic field pressure in a beta ra... 阅读全帖 |
|
k******6
发帖数: 7 | 7 Purpose
The Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National
Laboratory (ORNL) is seeking a Postdoctoral Research Associate with
experience and expertise in organic spintronics, with a strong emphasis on
the design, fabrication and characterization of organic spintronic device.
The CNMS http://cnms.ornl.qov/ is a nanoscience research facility supported by the Office of Science, U.S. Department of Energy (DOE). The CNMS has a diverse spectrum of nanoscience activities includ... 阅读全帖 |
|
k******6
发帖数: 7 | 8 Purpose
The Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National
Laboratory (ORNL) is seeking a Postdoctoral Research Associate with
experience and expertise in organic spintronics, with a strong emphasis on
the design, fabrication and characterization of organic spintronic device.
The CNMS http://cnms.ornl.qov/ is a nanoscience research facility supported by the Office of Science, U.S. Department of Energy (DOE). The CNMS has a diverse spectrum of nanoscience activities includ... 阅读全帖 |
|
k******6
发帖数: 7 | 9 Purpose
The Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National
Laboratory (ORNL) is seeking a Postdoctoral Research Associate with
experience and expertise in organic spintronics, with a strong emphasis on
the design, fabrication and characterization of organic spintronic device.
The CNMS http://cnms.ornl.qov/ is a nanoscience research facility supported by the Office of Science, U.S. Department of Energy (DOE). The CNMS has a diverse spectrum of nanoscience activities includ... 阅读全帖 |
|
a****y
发帖数: 1035 | 10 【 以下文字转载自 Military 讨论区 】
发信人: Fabu88 (范小楼), 信区: Military
标 题: 汤光文的黄金大米paper用的是氘同位素标记，无放射性。
发信站: BBS 未名空间站 (Thu Dec 6 11:38:21 2012, 美东)
汤光文的黄金大米paper用的是deuterium同位素标记，无放射性。这篇paper用
了68个小孩。（PubMed）汤的问题是对规则
的漠视，以及受试者的不知情。在这篇paper中，有以下声明：The study recruitment
processes and protocol
were approved by the Institutional Review Board–Tufts
Medical Center in the United States and by the Ethics Review
Committee of Zhejiang Academy of Medical Sciences in China.
Both parents and pupils consented to partic... 阅读全帖 |
|
M*V
发帖数: 3205 | 11 India plays key role in building super machine that will offer unlimited
energy
LONDON: India is developing the heaviest and the largest parts of the
Tokamak, the machine behind the biggest scientific collaboration on the
planet, to produce unlimited supplies of cheap, clean, safe and commercial
energy from atomic fusion.
The international nuclear fusion project known as ITER, meaning "the way" in
Latin, is based on the 'tokamak' concept of magnetic confinement, in which
the plasma is contained ... 阅读全帖 |
|
g***j
发帖数: 40861 | 12 # Tests for beta-carotene bioavailability and bioconversion to retinol (the
most significant source of Vitamin A) with deuterium-labelled Golden Rice
fed to adults in USA and a small group of children in China have been
conducted. The former were highly successful and the latter are being
evaluated at present.
# Feeding trials with human adults in China were carried out to measure the
effect of fat in the diet, on bioconversion and bioavailability. |
|
P********R
发帖数: 1691 | 13 下列内容的原文在黄金大米项目的网页：
http://www.goldenrice.org/Content2-How/how3_biosafety.php
...
8. Tests for beta-carotene bioavailability and bioconversion to retinol (the
most significant source of Vitamin A) with deuterium-labelled Golden Rice
fed to adults in USA and a small group of children in China have been
conducted, both highly successfully.
9. Feeding trials with human adults in China were carried out to measure the
effect of fat in the diet, on bioconversion and bioavailability.
...
...
Animal test... 阅读全帖 |
|
h*******g
发帖数: 2201 | 14 the mass difference between C13 and abundant C12 is small, most likely will
not cause much metabolic stress on the organisms. But Deuterium should be
highly alerted. |
|
c****g
发帖数: 37081 | 15 俺土，只听说D用在NMR跟踪，pk/pd用tritium，14C标记。要是能用D，谁没事蛋疼用T
？ |
|
|
c****g
发帖数: 37081 | 17 不懂，测血液中D代Vit A含量?质谱还能用定量?HPLC不更有效?
不跟踪，还用同位素标记, 蛋疼? |
|
c******k
发帖数: 8998 | 18 D可能更安全？更便宜？这个对精度要求也没那么高吧。
T |
|
O*******d
发帖数: 20343 | 19 现在质谱仪非常精确，也非常灵敏。 很多标记都可以用氢2。
T |
|
c****g
发帖数: 37081 | 20 反正是用HPLC定量,不标记的更准确,标记的跟不标记的代谢速率可能不同. |
|
|
y**********a
发帖数: 824 | 22 India plays key role in building super machine that will offer unlimited
energy
LONDON: India is developing the heaviest and the largest parts of the
Tokamak, the machine behind the biggest scientific collaboration on the
planet, to produce unlimited supplies of cheap, clean, safe and commercial
energy from atomic fusion.
The international nuclear fusion project known as ITER, meaning "the way" in
Latin, is based on the 'tokamak' concept of magnetic confinement, in which
the plasma is contained ... 阅读全帖 |
|
t**********8
发帖数: 1683 | 23
What's the point of getting TG's nuclear fusion technique?
TG's work is not to build a monopoly but to break one. If only US's monopoly
of oil and gas is broken, US's control of world's economy is gone. Getting
the nuclear fusion tech from China can not help US re-build the monopoly.
Besides, the fuel of nuclear fusion would probably be Helium-3 and deuterium
. Since NASA is declining, they won't be able to compete with China about
the space exploration, especially the mining work on moon. |
|
i*****s
发帖数: 4596 | 24 有一个不怎么准确的译文，不过可读性倒是不低，我把原文附在后面：
祖神来归式科学
费曼（Richard Feynman）
在中世纪，有各种类型的古怪观念，如象一块犀牛角会增强权力。后来找到一种方
法将各种观念进行分类 --- 行得通就弄明白它，行不通就取消它。尔后，这种方法
就逐步形成科学。而且它发展得很好，所以我们现在是处在科学的时代。然而使我
们很难理解的是，就在这样一个科学时代巫医怎么会存在，巫医提出的事，从没有
真正行得通 --- 或者很少行得通。
但是时至今日，我遇到不少人，他们总会和我说到飞碟（UFO），或者星相学，或者
某些神秘主义，扩大的知觉，新型意识，超感觉力，等等。我得到结论，这都不属
于科学世界。
许多人相信那些荒诞不经的事物，使得我决意研究他们为什么这样。我的好奇心促
使我去进行研究，而所涉及到的内容却使我陷入困境。居然有这么多糟粕，真使人
吃惊。首先我由研究神秘主义，神秘经验的各种思想入手。我进到隔离的试验槽，
并有过许多小时的幻觉经历，所以我知道关于神秘主义的某些东西。我还去过埃萨
伦，这里是各种思想的温床（这是一个很好的地方，你们应当去看看）。然后我变
得不... 阅读全帖 |
|
s*****V
发帖数: 21731 | 25 http://news.sciencemag.org/physics/2014/10/z-machine-makes-prog
The Sandia researchers reported this week in Physical Review Letters that
they had heated the plasma to about 35 million degrees Celsius and detected
about 2 trillion neutrons coming from each shot. (One reaction of fusing two
deuteriums produces helium-3 and a neutron.) Although the result shows that
a substantial number of reactions is taking place—100 times as many as the
team achieved a year ago—the group will need to produce 10... 阅读全帖 |
|
发帖数: 1 | 26 ITEM Quantity Cost in Dollars
ATOMIC MATERIALS
Beryllium metals 9,681 lbs. $ 10,874.
Cadmium alloys 72,535 lbs. 70,029.
Cadmium metals 834,989 lbs. 781,466.
Cobalt ore & concentrate 33,600 lbs. 49,782.
Cobalt metal & Cobalt bearing scrap 806,941 lbs. 1,190,774.
Uranium metal 2.2 lbs. ---
Aluminun tubes (for rea... 阅读全帖 |
|
f**r
发帖数: 865 | 27 (5)
Other kinds of errors are more characteristic of poor science.
When I was at Cornell, I often talked to the people in the
psychology department. One of the students told me she
wanted to do an experiment that went something like this--
it had been found by others that under certain circumstances,
X, rats did something, A. She was curious as to whether, if she
changed the circumstances to Y, they would still do A. So
her proposal was to do the experiment under circumstances
Y and see if they ... 阅读全帖 |
|
c****1
发帖数: 5654 | 28 ZT:
Specific information is provided on Indonesians (Malays and Chinese ancestry
), Singaporean Chinese, Malays and Indians, and Hong Kong Chinese. The BMI
was calculated from weight and height and the BF% was determined by
deuterium oxide dilution, a chemical-for-compartment model, or dual-energy X
-ray absorptiometry. All Asian populations studied had a higher BF% at a
lower BMI compared to Caucasians. Generally, for the same BMI their BF% was
3-5% points higher compared to Caucasians. For the... 阅读全帖 |
|
d******2
发帖数: 2795 | 29 http://en.wikipedia.org/wiki/David_J._Wineland
Godfather - trapped ion quantum computing
David Jeffrey Wineland[1] (born February 24, 1944[2]) is an American
physicist at the National Institute of Standards and Technology (NIST)
physics laboratory and the University of Colorado in Boulder. His work has
included advances in optics, specifically laser cooling of ions in Paul
traps and use of trapped ions to implement quantum computing operations. In
2012 he received the Nobel Prize in Physics.[3]... 阅读全帖 |
|
m******g
发帖数: 17798 | 30 第一名 500 wb
第二名 300 wb
第三名 100 wb
第4-10名 50 wb
其余参与的 20 wb
如果对自己的分数有异议，请在周二夜11:59分之前联系版务，谢谢
ID 第一轮 第二轮 分区决赛总决赛 得分
Perl 60 20 40 80 200
abego 60 80 40 0 180
ADOMET8 70 60 40 0 170
superkop 70 60 40 0 170
honyi 60 60 40 0 160
enantiomers 60 60 40 0 160
SimoneVerdi 60 60 40 0 160
pcu 60 60 40 0 160
orzgod 60 60 40 0 160
XC60 60 60 ... 阅读全帖 |
|
J********i
发帖数: 50662 | 31 【 以下文字转载自 WBCenter 讨论区 】
发信人: JianlianYi (Air Yi), 信区: WBCenter
标 题: NBA版申请颁发季后赛竞猜奖金
发信站: BBS 未名空间站 (Mon Jun 13 18:04:07 2011, 美东)
竞猜统计结果请见
http://mitbbs.com/article1/NBA/31494249_3_0.html
感谢飞哥的统计，感谢大家的踊跃参与（共60人参加）
奖金如下，总计2300伪币，请从NBA版版面扣除，谢谢一夫。
ID 奖金（伪币）
前4名：
Perl 500
abego 300
ADOMET8 100
superkop 100
－－－－－－－－－－－－－－－－－－－－－－
5~10名，每人50伪币 （共6人）
honyi 50
enantiomers 50
SimoneVerdi 50
pcu 50
orzgod 50... 阅读全帖 |
|
R******d
发帖数: 5739 | 32 我不是什么大牛， 这个也不是我专业。 但我相信要真的去较真， 你必须要有一定的
科学基础和专业知识。 这里大部分人可能没有专业知识， 质疑是对的， 但较真的话
水平可能不太够
quote
－－－－－－－
II. The Vostok Ice-Core
To demonstrate the methods used in dating ice-cores I will use the Vostok
ice-core as an example because I found plenty of literature on it and
because it is an Antarctic ice-core which was what the original post was
about.
How It Was Collected
The Vostok Ice-Core was collected in East Antarctica by the Russian
Antarctic expedition. The Vostok Ice-Core is 2,083 meters lo... 阅读全帖 |
|
R******d
发帖数: 5739 | 33 我不是什么大牛， 这个也不是我专业。 但我相信要真的去较真， 你必须要有一定的
科学基础和专业知识。 这里大部分人可能没有专业知识， 质疑是对的， 但较真的话
水平可能不太够
quote
－－－－－－－
II. The Vostok Ice-Core
To demonstrate the methods used in dating ice-cores I will use the Vostok
ice-core as an example because I found plenty of literature on it and
because it is an Antarctic ice-core which was what the original post was
about.
How It Was Collected
The Vostok Ice-Core was collected in East Antarctica by the Russian
Antarctic expedition. The Vostok Ice-Core is 2,083 meters lo... 阅读全帖 |
|
s******y
发帖数: 28562 | 34 说回这个超新星，这个是一个很有意思的问题，因为它既是一个毁灭者，也是一个创始
者。超新星爆炸的时候（在理论上）会炸坏附近的所有行星和足够近的恒星，会把他附
近的世界全部蒸发为气态。但是，在这个爆炸过程中会把恒星的轻元素(hydrogen,
helium, deuterium, lithium)转换成其他比较重的元素比方说氧，碳，钙和铁之类的
，并向整个宇宙发送，这些比较重的元素构成了生物的元素。关于这个毁灭者和创造者
的双重性，不谋而同的在人类的很多宗教理论中出现，比方说印度教的三位一体理论（
Brahma-Vishnu-Shiva,创造-维持-毁灭）。 |
|
j****u
发帖数: 1413 | 35 新闻请见：http://www.ustcif.org/default.php/content/1898
2013年，中国科学院院士增选日前投票结束，传中国科大赵政国、谢毅获选。
11月7日，中国科学院进行新一轮院士增选投票。8日9:30开始，包括中国科大瀚海星云
BBS在内的各大高校BBS等论坛即不断爆出新增院士名单。瀚海星云BBS的科大发展版多
个帖子披露，中国科大物理学院教授、首批千人计划入选者赵政国（774）、化学学院
教授谢毅（9212硕博）当选中国科学院院士。
8日，一位不在科大工作的杰出青年基金校友告知新创基金会"科大赵政国、谢毅上院士
了"。此外，据传中国科学院长春应用化学研究所研究员杨秀荣（633）也当选中国科学
院院士。新创基金会随即致电、短信向五个权威渠道核实中国科大两位相关部处（或学
院）负责人、1位中国科大教授、两位中国科学院院士。两位相关部处（或学院）负责
人因职务原因婉拒证实或否认此事。
赵政国（774），入选中国科大首批千人计划。
新创基金会在5月20日曾发布《中科院院士增选枪响，近三十中国科大人起跑》称院士
增选是一项惨烈的淘汰战。该新闻介绍“中国科大教... 阅读全帖 |
|
B******1
发帖数: 9094 | 36 D2O or deuterium oxide is normally used as solvent in NMR. Not HPLC water,
which is H2O. |
|
c*********o
发帖数: 1469 | 37 I used d1-triflic acid to do protonation of Hunig's base. I ran D-NMR but I
could find the deuterium signal of the pronated base. Any ideas would be
appreciated. |
|
q****g
发帖数: 19 | 38 I do not know why there are doublets or two peaks, either. But there are two
things for sure.
1. Those doublets are not due to C-Br J-coupling. For quadrupolar nuclei,
deuterium is probably the only common one that you can see J couplings. For
others, you won't observe them due to fast quadrupolar relaxation of them.
Google "self decoupling" for more information.
2. The JMR paper measures the J coupling of C-Br by an indirect way. That
does not mean you can observe them by 1D spectrum. |
|
d**m
发帖数: 94 | 39 PEO-deuterium-PPO-PEO?? |
|
|
l*****e
发帖数: 112 | 41 http://www.cbsnews.com/video/watch/?id=4955212n
http://world.std.com/~mica/cft.html
Wall Street Journal - Keith Johnson -
"Wasn’t cold fusion supposed to be a myth? Apparently not—“60 Minutes”
ran a story Sunday night arguing that so-called cold fusion is “hot again.
”.... . Laboratories in the U.S., Italy, and Israel have all run
experiments dunking palladium in deuterium and then zapping it with electric
current. The promise of cold fusion is that that mix creates more energy
than it consumes. |
|
J********i
发帖数: 50662 | 42 竞猜统计结果请见
http://mitbbs.com/article1/NBA/31494249_3_0.html
感谢飞哥的统计，感谢大家的踊跃参与（共60人参加）
奖金如下，总计2300伪币，请从NBA版版面扣除，谢谢一夫。
ID 奖金（伪币）
前4名：
Perl 500
abego 300
ADOMET8 100
superkop 100
－－－－－－－－－－－－－－－－－－－－－－
5~10名，每人50伪币 （共6人）
honyi 50
enantiomers 50
SimoneVerdi 50
pcu 50
orzgod 50
XC60 50
－－－－－－－－－－－－－－－－－－－－－－
参与奖，每人20伪币 （共50人）
andysun
Antoine
opt
sosoid
christwt
vincentxia
wave618 ... 阅读全帖 |
|
m*********k
发帖数: 10521 | 43 [NBA] 2010-2011赛季NBA季后赛竞猜
500+300+100*2+50*6+20*51=2320
成功奖励 500 伪币的用户: Perl
成功奖励 300 伪币的用户: abego
成功奖励 100 伪币的用户: ADOMET8, superkop
成功奖励 50 伪币的用户: honyi, enantiomers, SimoneVerdi, pcu, orzgod, XC60
成功奖励 20 伪币的用户: andysun, Antoine, opt, sosoid, christwt, vincentxia,
wave618, K307, meflying, casact, Mutombo, JackJones, begoing, pplulu, oct4,
piu, watermoon, zhazhe, betep, BeastGriffin, HuaJie, ou5603, zkjeffrey,
FTSCI, Jingqg1979, pandora3130, s3, sunfish, aimer, tosea, hardier, atwood,
magicXP,... 阅读全帖 |
|
J********i
发帖数: 50662 | 44 多谢
[NBA] 2010-2011赛季NBA季后赛竞猜
500+300+100*2+50*6+20*51=2320
成功奖励 500 伪币的用户: Perl
成功奖励 300 伪币的用户: abego
成功奖励 100 伪币的用户: ADOMET8, superkop
成功奖励 50 伪币的用户: honyi, enantiomers, SimoneVerdi, pcu, orzgod, XC60
成功奖励 20 伪币的用户: andysun, Antoine, opt, sosoid, christwt, vincentxia,
wave618, K307, meflying, casact, Mutombo, JackJones, begoing, pplulu, oct4,
piu, watermoon, zhazhe, betep, BeastGriffin, HuaJie, ou5603, zkjeffrey,
FTSCI, Jingqg1979, pandora3130, s3, sunfish, aimer, tosea, hardier, atwood,
magi... 阅读全帖 |
|
