l**t
发帖数: 6971 | 1 http://www.bloomberg.com/news/2011-11-01/tepco-says-nuclear-fis
Possible Nuclear Fission Detected at Fukushima Plant
Tokyo Electric Power Co. detected signs of nuclear fission at its crippled
Fukushima atomic power plant in northern Japan, raising the risk of more
radiation leaks. The situation is under control, officials said.
The company, known as Tepco, began spraying boric acid on the No. 2 reactor
at 2:48 a.m. Japan time to prevent accidental chain reactions. Tepco said it
may have found xe... 阅读全帖 |
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l**t
发帖数: 6971 | 2 http://www.bloomberg.com/news/2011-11-01/tepco-says-nuclear-fis
Possible Nuclear Fission Detected at Fukushima Plant
Tokyo Electric Power Co. detected signs of nuclear fission at its crippled
Fukushima atomic power plant in northern Japan, raising the risk of more
radiation leaks. The situation is under control, officials said.
The company, known as Tepco, began spraying boric acid on the No. 2 reactor
at 2:48 a.m. Japan time to prevent accidental chain reactions. Tepco said it
may have found xe... 阅读全帖 |
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l**t
发帖数: 6971 | 3 http://www.businessweek.com/news/2011-11-01/fukushima-plant-rel
Oct. 31 (Bloomberg) -- The destroyed Fukushima nuclear plant in Japan was
responsible for the biggest discharge of radioactive material into the ocean
in history, a study from a French nuclear safety institute said.
The radioactive cesium that flowed into the sea from the Fukushima Dai-Ichi
nuclear plant was 20 times the amount estimated by its owner, Tokyo Electric
Power Co., according to the study by the Institute for Radiological... 阅读全帖 |
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l**t
发帖数: 6971 | 4 http://www.businessweek.com/news/2011-11-01/fukushima-plant-rel
Oct. 31 (Bloomberg) -- The destroyed Fukushima nuclear plant in Japan was
responsible for the biggest discharge of radioactive material into the ocean
in history, a study from a French nuclear safety institute said.
The radioactive cesium that flowed into the sea from the Fukushima Dai-Ichi
nuclear plant was 20 times the amount estimated by its owner, Tokyo Electric
Power Co., according to the study by the Institute for Radiological... 阅读全帖 |
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W***i
发帖数: 9134 | 5 http://seattletimes.nwsource.com/html/localnews/2014480548_nuke
Washington state health officials monitoring the nuclear-plant incidents in
Japan say there is currently no danger of exposure here.
Air monitoring shows no elevated radiation levels, said Department of Health
spokesman Donn Moyer.
In a worst-case scenario, a nuclear meltdown could release radioactive
isotopes, including iodine, that could reach the U.S. West Coast in six to
10 days, Dr. Ira Helfand, of Physicians for Social Respons... 阅读全帖 |
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t******4
发帖数: 2300 | 6 Chinese-born wife murdered her spouse with thallium rather than agree to a
divorce
NEW BRUNSWICK, N.J. (AP) — A Chinese-born chemist who worked for a decade
for one of America's biggest pharmaceutical companies was a cold,
calculating murderer who poisoned her husband rather than let him divorce
her, a judge said Monday as he sentenced her to life in prison.
Tianle Li won't be eligible for parole for more than 62 years for the
killing of Xiaoye Wang, a computer software engineer, in early 2011, ... 阅读全帖 |
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B*****1
发帖数: 526 | 7 Assume they were from Japan (actually they are not, but that's not the point
here),even if the rice is exposed to radiation, in all likelihood, it's
still safe to eat, just like many radiation treated fruits, meat and so on.
The dosage used to irradiate food now days is a lot higher than those near
by rice fields in Japan were exposed to, actually there is no dosage upper
limit for radiation in treating food. Go figure. But if the radioactive
isotope was in the soil and got absorbed into the r... 阅读全帖 |
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p*********l
发帖数: 26270 | 8 比喻，比喻。。。绝对不骂人。。。:)
说正经的，文盲我刚才看你那个reps的图，查了几个术语，根据下面这个Link的说法，
"Sarcoplasmic hypertrophy is characteristic of the muscles of certain
bodybuilders while myofibrillar hypertrophy is characteristic of Olympic
weightlifters." 综合你的那个图标，那么，你大重量少rep，就是更侧重于长力气而
不是大小，对不对?
http://en.wikipedia.org/wiki/Muscle_hypertrophy#Myofibrillar_vs
Myofibrillar vs. Sarcoplasmic hypertrophy controversy
This section needs additional citations for verification. (July 2012)
In the bodybuilding and fitness community and... 阅读全帖 |
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g******a
发帖数: 667 | 9 Albuquerque Isotopes
Auburn Doubledays
Beloit Snappers
Birmingham Barons
Brooklyn Cyclones
Cancun Lobstermen
Carolina Mudcats
Cedar Rapids Kernels
Chattanooga Lookouts
El Paso Diablos
Eugene Emeralds
Hickory Crawdads
Hudson Valley Renegades
Inland Empire 66ers of San Bernardino
Jamestown Jammers
Las Vegas 51's
Monterrey Sultans
Montgomery Biscuits
New Orleans Zephyrs
Savannah Sand Gnats
Swing of the Qua Cities
Toledo Mud Hens
Tri-City Dust Devils
Wichita Wranglers... |
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T****r
发帖数: 4006 | 10 你说的太绝对，看看下面的，应该还有更多的证据，你也可以找些证据来支持你的看法。
The existence of glyoxylate cycles in humans has not been established, and
it is widely held that fatty acids cannot be converted to glucose in humans
directly. However, carbon-14 has been shown to end up in glucose when it is
supplied in fatty acids.
Weinman, E.O., et al. (1957). "Conversion of fatty acids to carbohydrate:
application of isotopes to this problem and role of the Krebs cycle as a
synthetic pathway". Physiol. Rev. 37 (2): 252–72. PMID 134414... 阅读全帖 |
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w****1
发帖数: 4931 | 11 Let me clarify my point. I did not argue against creationism. While I am an
atheist myself, I generally respect religious people, including my wife (who
is pagan). In fact, I have colleagues who are well respected scientist and
yet deeply religious at the same time.
Secondly, let me remind you the evidence for evolution -- fossils, which can
be dated by measuring radiative isotopes. You want living evidence of
evolution? Well, the cold and flu virus around you are living evidences --
they mutate... 阅读全帖 |
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J********i
发帖数: 50662 | 12 http://www.latimes.com/news/science/la-sci-japan-nuclear-usa-20
Small amounts of radiation headed for California, but no health risk seen
Very low levels of radioactive isotopes from the damaged Japanese nuclear
plant are expected to reach California as soon as Friday, but experts say
the amount will be well within safe limits. A network of radiation monitors
is keeping close watch. |
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O*******o
发帖数: 7091 | 13 40 years to the Sabena Flight 571 hijacking
Sabena Flight 571 was a scheduled passenger flight from Vienna to Tel Aviv
operated by the Belgian national airline, Sabena. On May 8, 1972 a Boeing
707 passenger aircraft operating that service, and captained by the
Englishman, Reginald Levy, DFC, was hijacked by four terrorists from the
Black September organization and landed at Lod Airport (later Ben Gurion
International Airport) near Lod, although that was the planned destination
anyway.
The attack... 阅读全帖 |
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T****e
发帖数: 2798 | 14 1. What can burn the eyes, sting the mouth, yet be consumed?
A: Chili
2. I am emeralds and diamonds, lost by the moon. I am found by the sun and
picked up soon. What am I?
A: Frost
3. What has four wheels and flies?
A: Flywheel
4. What is it the more you take, the more you leave behind?
A: Trouble
5. What can run but never walks, has a mouth but never talks, has a bed but
never sleeps, has a head but never weeps?
A: Car
6. Feed me and i live, give me to drink and i die. What am i?
A: Vending ... 阅读全帖 |
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G*******g
发帖数: 556 | 15 You are still considering one side of the slowness, the other side is that
the "rate" is low, and one of the most significant measure of the radiation
threat to human body is the dose rate, which is the rate at which the
radiation is absorbed by human body. It is just the same fact appreciated
from two different points of view.
Therefore, after the short-lifed isotopes have decayed away, the radiation
level will drop significantly, but may still remain above acceptable level
for a very long time... 阅读全帖 |
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G*******g
发帖数: 556 | 16 yes, no one would expect anything to decay from non-rad to rad. BTW, decay
also can be rad-2-rad, leading to the production of more toxic isotope w.r.t
to human health. That further complicates the math though.
that the decay rate is very very slow.
radioactive to radioactive. |
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c*****g
发帖数: 21627 | 17 【 以下文字转载自 Military 讨论区 】
发信人: choming (请抵制“十万强插”计划！), 信区: Military
标 题: NJ: 毒杀亲夫的李天乐被判无期徒刑 (转载)
发信站: BBS 未名空间站 (Mon Sep 30 15:06:52 2013, 美东)
发信人: lczlcz (lcz), 信区: USANews
标 题: NJ: 毒杀亲夫的李天乐被判无期徒刑
发信站: BBS 未名空间站 (Mon Sep 30 13:29:42 2013, 美东)
Life in prison for NJ chemist who poisoned husband
September 30, 2013 - 12:36 PM
Associated Press
NEW BRUNSWICK, N.J. (AP) — A Chinese-born chemist who worked for a decade
for one of America's biggest pharmaceutical companies was a cold,
calculating murde... 阅读全帖 |
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d********f
发帖数: 43471 | 19 张朝晖
性 别 男 职 称 教授
研究方向 Organic geochemistry/isotope geochemistr 电 话 +86
25 8359 2024
电子邮件 z*****[email protected] 传 真 +86 25 8368 6016
办公地点 邮政编码 210093
通讯地址
张朝晖
教授，博士生导师
2009-present 南京大学教授，博士生导师
2006-2008 美国University of Massachusetts Amherst, Senior Postdoctoral
Research Associate
2003-2005 美国麻省理工学院(MIT) Comer Postdoctoral Fellow
1996-2003 美国常青藤盟校之一的Dartmouth College, Ph.D.
1993-1996 中国科学院地球化学研究所工作，助理研究员
1990-1993 中国科学院地球化学研究所，获硕士学位
... 阅读全帖 |
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H******7
发帖数: 34403 | 20 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 |
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i******l
发帖数: 268 | 21 K-capture,电子俘获不能在自由质子（氢原子）中发生。只能在很大的原子核里发生，
同时释放一个neutrino，而且那时为了获得更稳定的isotope.
所以也不算撞正中吧质子变为中子 |
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o***o
发帖数: 11767 | 22 【 以下文字转载自 Automobile 讨论区 】
发信人: Barton87 (HIGH-FIVE), 信区: Automobile
标 题: Re: 夏天路面地表温度巨高，打了氮气的车胎很强悍！
发信站: BBS 未名空间站 (Tue Aug 9 21:42:15 2016, 美东)
打同一种气体，分子之间的repulsion 比杂质气体更isotopically uniform, 胎更饱满
，我的打过氮气之后每次开过石子铺的路面后，很少有石子塞到轮胎缝隙中了，以前充
空气，经常附着n多石子。。。 |
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发帖数: 1 | 23 科学家发现新型物质结构 或改写教科书
美国科学家最近声明，找到证据说明存在一种理论认为不可能的物质组成方式，即四个
中子可以结合在一起并稳定存在。该发现有可能改变教科书的基本粒子理论。
这种基本粒子结合方式可以简称为“四中子群”（Tetraneutron）。据物理学网站phys
.org近日报道，爱荷华州立大学（Iowa State University）的天文物理学家吉姆斯·
维丽（James Vary）教授等人使用超级计算机模型计算得出，四中子群可以“准稳态存
在”（quasi-stable existence）。也就是说，四个中子可以结合在一起，并能保持基
本稳定的状态，而不是过去认为的绝对不可能。
“这打开了一个全新的研究领域。”维丽教授说：“研究四中子群将有助于了解中子间
的相互作用力，包括以前未探讨过的不稳定二中子和三中子组成系统。”
该研究发表于近期的《物理评论快报》（Physical Review Letters）。实际上，今年
年初，日本科学家在理化学研究所放射性同位素集束工厂（RIKEN Radioactive
Isotope Beam Factory）首次找到四中... 阅读全帖 |
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B********e
发帖数: 19317 | 24
看这段。
Elements come in forms with different weights, called isotopes. Carbon-12
and carbon-13 (the heavier of the two) are both common on Earth, but living
things prefer to use carbon-12. Sensitive techniques can determine whether a
rock or putative fossil contains more carbon-12 than expected, suggesting
that the material may once have been alive. |
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s*********a
发帖数: 801 | 25 气候变化毁灭了尼安德特人时间:2009-09-24 09:52
来源:《环球科学》2009年第9期
尼安德特人曾是欧洲大陆上盛极一时的古人类，有着20多万年的辉煌历史。然而在2万
～ 6万年前，一场剧烈而又反复无常的气候变化，把他们逼上绝路：森林变为草原……
而适应能力更强的现代人的出现，更是加速了这群古人类的灭绝。
撰文 凯特·王（Kate Wong）
翻译 杨宁宁
尼安德特人为何消失
● 尼安德特人是现代欧洲人祖先的近亲，从20万年前开始，他们统治着整个欧洲和亚
洲西部，但在2.8万年前，这些古人类却消失了。
●长期以来，科学家一直在探讨尼安德特人消失的原因。最新理论认为，导致尼安德特
人消失的原因可能有两个：气候突然变化；现代人的祖先在某些生物特征上全面优于尼
安德特人，逐步取代了他们。
大约2.8万年前，在如今的英属直布罗陀地区，一小群尼安德特人在遍布岩石的地
中海沿岸艰难地生活着——他们很可能是最后一群尼安德特人。在欧洲和西亚的其他地
区，尼安德特人早在此前几千年就已销声匿迹，尽管他们在这里有着20多万年的辉煌过
去。由于气候相对温和，动植物资源丰富，伊比... 阅读全帖 |
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j*****6
发帖数: 1059 | 26 这个是摘要：
Radiogenic Helium and Argon in Ultramafic Inclusions from Hawaii
John G. Funkhouser
Chemistry Department and Hawaii Institute of Geophysics, University of Hawai
i, Honolulu, Hawaii 96822
John J. Naughton
Chemistry Department and Hawaii Institute of Geophysics, University of Hawai
i, Honolulu, Hawaii 96822
Isotopic studies have been made of the inert gases present in ultramafic xen
oliths from two sites in Hawaii, the 1800–1801 Kaupulehu flow (Hualalai Vol
cano, Hawaii) and Salt Lake Crate... 阅读全帖 |
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RR
发帖数: 561 | 27 既然你把“世界是上帝创造的”作为前提，咱们就讨论一下这句话。
世界是上帝什么时间创造的，怎么创造的，都创造了什么？看看bible怎么说
Bible New International Edition line 1:
"In the beginning God created the heavens and the earth."
如果把bible上所有纪年加起来，大约是6000年(1)，这里说in the beginning，
也就是大约6000年前。根据地质学，地球的年龄是4.55 ± 0.01Gya(2)。再举
一个通俗的例子，6500万年前，恐龙生活在地球上， 这也是无数考古发掘证明了的。
请问如何解释。
(1) Biblical Chronology: Legend Or Science? James Barr, 1987
(2) Lead isotope study of basic-ultrabasic layered complexes:
Speculations about the age of the earth and primitive mantle
charac... 阅读全帖 |
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l*******t
发帖数: 1016 | 28 美国华人生物医学发考题猝死现象
刚来美国做博后就听说个一个华人biomedical faculty 手里有三个R01，有一次做
presentation讲到激动处昏厥 然后就挂了。 还有一次有个华人faculty candidate 来
我们学校面试presentation 不到40岁 可是已经满头白发看起来非常苍老。华人Biomed
千老有死于胃癌的 女千老怀毛毛下面就流血的等等。这可能有以下原因：
1）工作时间长 三点一线 》60h/w
2）跑胶克隆核酸纯化也是辛苦体力活
3）读写说查都用英文 费脑力
4）大量杀生（杀老鼠等）造业很大
5）使用isotopes, carcingoens, HIV FIV lentivirus 等使免疫力下降
6) 没法在家上班 风雨雪通勤开车也紧张
7）和国内同学比 当不上发考题没有面子 压力大
8）NIH funding竞争性太强
9）实验室内多是华人 处理关系费事
10）多数没有信仰 不能meditate或者太极放松
建议搞生物医学的发考题和千老，最好学学佛教 会有很大的收获和人生观的改变。念
金刚经会使脑筋得到极大休息 念地藏经会消除杀老鼠的... 阅读全帖 |
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v**s
发帖数: 1 | 29 History about Physics II:
Physics II was orignally called Nuclear Science, it had two majors: nuclear
physics and radioactive chemistry. And a side knowledge, to build a nuclear
bomb, you need radioactive chemistry technology to get pure uranium isotope,
and nuclear physics to make uranium fission happen. This department used to
get the most brilliant students, and believe me, they once had prettiest girls
in Fudan also.
I have no idea how this department has anything to do with enviroment scien |
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r******a
发帖数: 136 | 30 『2009-04-18 16:33:28』『字号：大 中 小』『浏览：5865次』『打印』
近日，我校西部环境教育部重点实验室客座研究人员Loukas Barton，以兰州大学
为第一作者单位，在美国国家科学院院刊《PNAS》（Proceedings of the National
Academy of Sciences of the United States of America）上发表了题为“
Agricultural origins and the isotopic identity of domestication in northern
China”的学术论文（全文地址：http://www.pnas.org/content/early/2009/03/20/0809960106.full.pdf+html）。这是我校第一次以第一作者单位在PNAS发表研究论文。
作为美国国家科学院的官方科学杂志，PNAS拥有广泛的读者群，特别是世界各地从
事基础科学领域研究的科学工作者。该杂志出版前沿研究报告、述评、综述、前瞻及学
术讨论会论文等，覆盖生物学、物理学、数学和社会科学等领域， |
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l**i
发帖数: 8245 | 31 ft 第一作者身兼3个身份，第三个才是兰大 这算是什么第一单位啊
Agricultural origins and the isotopic identity of domestication in northern
China
Loukas Bartona,b,c,1, Seth D. Newsomed, Fa-Hu Chenc, Hui Wange, Thomas P.
Guildersonf, and Robert L. Bettingera
aDepartment of Anthropology, University of California, One Shields Avenue,
Davis, CA 95616;
bKatmai National Park and Preserve, P.O. Box 7, King Salmon,AK 99613;
cCenter for Arid Environment and Paleoclimate Research, Ministry of
Education Key Laboratory of West China’s En |
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a*q
发帖数: 2109 | 32 【 以下文字转载自 Joke 讨论区,原文如下 】
发信人: st (小老虎), 信区: Joke
标 题: 食堂.午饭(x)
发信站: The unknown SPACE (Thu May 11 11:51:30 2000), 转信
发信人: isotope (无放射性), 信区: Joke
标 题: 食堂.午饭(x)
发信站: BBS 水木清华站 (Sat May 6 14:14:13 2000)
中午去食堂吃饭,遇到这么一出.一mm与一gg准备共进午餐,刷卡器前.
gg:我来插吧.
mm(深情状):不要嘛.
gg:就让我来插吧,就一次.
mm(娇纵加恶心状):人家不愿意,不嘛!
这时卖饭的师傅怒了:别管谁插,你们快点搞定,后面人还等着呢! |
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K******S
发帖数: 10109 | 33 pour some cold water, hoho (I happened to did some phosphoproteomics works
when I was in graduate school.)
关键词：
定量的实现：I agree stable isotope labeling is the key. But metabolically
labeling (in cell culture) can only solve part of the problem, how about
tissue samples, body fluid etc? There are ways to label such samples
actually both on protein level and peptide level (chemically and by using
enzymes), but still lots of questions need to be answered such as: can you
label all of them? variations |
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n****n
发帖数: 434 | 34 My 2 cents:
1. You're not supposed to do anything for anybody unless you want to help
the person and/or share some credit.
2. You can tell your boss that you are concerned about ACCIDENTAL radiation.
3. Lastly and equally importantly, I am shocked to find out you and all the
"commentators" here are so UNKNOWLEADGBLE about the proper use/handling of
isotopes. With PROPER protection (e.g. gloves, shields), you will NOT be
harmed by the low amount of radiation (e.g. Southern or Northern).
In the la |
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s******y
发帖数: 28562 | 35
定了，信号/
I guess in the first case you pulldown your protein and then analyze the
pulldown result by WB? In such case, it would look decent.
In the second case were you trying to pulldown in vivo synthesized protein
with isotope? Indeed, the signal/noise will look awful, because many
endogenous protein also have the radioactive label.
Well, if that's what you want, you probably will need to try the anti-6XHis
antibody. Unfortunately I don't know which antibody works for IP. You should
check this |
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p*****m
发帖数: 7030 | 36 in situ现在没几个人用isotope了吧 DIG很可靠了 没什么问题 |
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s******e
发帖数: 841 | 37 怎么设计这个assay？除了同位素标记NAD+检测产物ADP-ribose，还有non-isotopic的
方法检测ADP-ribose吗，最好有fluorescence conjugated的抗体就好了 |
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D****g
发帖数: 275 | 38 Roche Northern blot start kit
It is good for me. However, there are somethings you should kept in mind:
Even they said that it is as sensitive as P32, but radioactive method stills
is the most sensitive method, it is good for abundent gene, if the gene
expression level is lower and the probe is short, you should try P32 first. |
|
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k*****o
发帖数: 1486 | 40 看了几个帖子，和以前师兄教我的不一样啊，他说强弱是这样的，
C14 < P32 < S35
P32和S35他非常注意，穿透力强，我们都有用铅做的瓶子。S35更有铅的shield，Geiger counter离近了就狂响。
但是C14和D的compound瓶子他上来就拿手抓，
搞得我们都是这样做的...
首先，拿手抓什么compound的瓶子都是非常不好的恶习，望大家严加注意！！
另外，我真的好奇，C14的half life那么长，引sunny："
C-14's half life is 5730 years..."，我抓了这么多，会不会挺危险的...|| |
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s******y
发帖数: 28562 | 41 As long as you didn't eat or inhale the C-14, then you are perfectly fine.
Geiger counter离近了就狂响。 |
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K******S
发帖数: 10109 | 42 think about the how SILAC works and what mass spec measures.
without different isotopic labeling (aka, no mass shift), how can you tell
the same protein/peptides (although from 2 samples) apart? |
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M*****n
发帖数: 16729 | 43 for sounthern, DIG labeled probes work well.
check Roche website for the complete info.
stay away from isotopes if you are preganant or plan to be pregnant. |
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k****l
发帖数: 279 | 44 For scintillation counter, if I use the method for 14C to count samples with
both 14C labeling and 3H labeling, does the 3H contribute to the counting?
Can the counter tell between different isotopes?
Thanks. |
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K******S
发帖数: 10109 | 45 then what are absolute quantitation, stable isotopic labeling and MRM doing
in both industry and academia? |
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y********g
发帖数: 22 | 46 Don't know any machine can directly read TLC.
But you can expose TLC to phosphor storage plate, then scan the image on
Typhoon or other scanner. The exposure takes some time depending how hot
your isotope is. |
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d*****r
发帖数: 2583 | 47 http://www.hhmi.org/news/popups/isrf_pop.html
2011 International Student Research Fellows
Institution Student Advisor Discipline
Boston University Wei Guo
China Barbara Shinn-Cunningham Systems and computational
neuroscience
Brandeis University Marcus Long
United Kingdom Lizbeth Hedstrom Protein degradation using chemical
biology
California Institute of Technology Andreas Hoenselaar
Germany Thanos Siapas Spatial mapping in the hippocampus using
virtual
reality... 阅读全帖 |
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g*********5
发帖数: 2533 | 48 i.e, some substitute of 35S-Met AND 35Cys? |
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n********k
发帖数: 2818 | 49 depends on your exp...anyway, the most tedious and tiring work ever for me
as much as isotope work...the problem is you have to be 120% careful all
time...I actually don't trust to let others do it for me... |
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