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全部话题 - 话题: ligation
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w******e
发帖数: 1187
1
一端是2'F RNA,另一端是DNA,splint template是DNA,这样DNA ligase会
work吗?呵呵
T**********t
发帖数: 1604
2
http://www.neb.com/nebecomm/products/faqproductM0204.asp#331
Q9: Can T4 RNA Ligase 1 be used to make single stranded RNA/DNA hybrids?
A9: Yes.
w******e
发帖数: 1187
3
多谢!加个问题哈:我看了几篇paper都选择T4 DNA ligase instead of RNA ligase,
不知道用RNA ligase有没有什么concern?
N2
发帖数: 81
4
来自主题: Biology版 - 借人气问个小片段回收的问题
事情怎么弄的这么复杂
方法1: 直接设计在长引物里就好,IDT,100nmol,90bases
方法2: 2 oligos to form a adaptor with sticky ends and used in the ligation
directly without recovery , add 0.2u PNK in the ligation and you don't need
primer Phosphorylation
r****d
发帖数: 4
5
来自主题: Biology版 - 质粒连接效率低的问题
pEntry is a high copy number plasmid. I knew the person who constructed this
vector and had cloned a lot gene into it. I never had any problem. First,
what is the concentration of Kan for your plate, I usually use 20 to 30 mg/l
. Second, the volume of plasmid should be less than 5% of total volume of E.
coli. You can try the competent cell from bioline. For PCR ligation, if you
do a 12 degree over night ligation, the efficiency is better.
r*****t
发帖数: 4793
6
来自主题: Biology版 - paper help!
Nature. 2012 Mar 14;483(7390):434-8. doi: 10.1038/nature10895.
Intrinsic coupling of lagging-strand synthesis to chromatin assembly.
Smith DJ, Whitehouse I.
Source
Molecular Biology Program, Memorial Sloan-Kettering Cancer Center, 1275 York
Avenue, New York, New York 10065, USA.
Abstract
Fifty per cent of the genome is discontinuously replicated on the lagging
strand as Okazaki fragments. Eukaryotic Okazaki fragments remain poorly
characterized and, because nucleosomes are rapidly deposited on n... 阅读全帖
u*********1
发帖数: 2518
7
正在制作用于whole-genome sequencing的human genome library。做完ligation跑胶
看到smear,然后切下比如450-500bp的区间做PCR。但可能是50bp的interval太小或者
自己技术不好,所以最后PCR出来的亮度比较低。(当然也不排除ligation efficiency
不好)
PCR的结果如图。
还没拿去测浓度。只想问问有经验的前辈这样的情况能拿去测30 coverage的WGS吗?
另外还有一个问题,就是,我们切胶的smear每一个区间(300-400,400-500,500-600
)这些区间里都一定cover了genome的每一个部分吗?我总担心genome的有的部分没有
被涵盖到,那岂不是就人为引入了很多bias?
thx
l******o
发帖数: 103
8
I have the following problem. I want to introduce a point mutation to my
plasmid. The plasmid is super big. So I first cut out a fragment(~4kb) with
XbaI and then ligate it to another vector. After introducing mutation with
mutagenesis kit, the sequencing result is as expected.
Next step is to put the XbaI-XbaI fragment containing the mutation back
into the original clone. After ligation and transformation with DH5alpha I
get a number of colonies (~20) but no colonies in the negative control. B... 阅读全帖
z*********3
发帖数: 335
9
来自主题: Biology版 - 分子生物学问题求救
1. If RE works fine, check your ligase. Use high efficiency ligation kit
like NEBNext Quick Ligation Kit.
2. Change cloning strategy, e.g. PIPE cloning (NO RE, NO Ligase!!!)
http://pef.aibn.uq.edu.au/support/material/download/The_Polymer
s*********u
发帖数: 2535
10
来自主题: Biology版 - 分子生物学问题求救
1. 1500bp片断应该问题不大,算中等长度的ligation,应该是可行的。
2. 五个应该够了,偶一般用的3到4个。
3. 这应该说明不是ligase的问题,很可能是insert和vector的问题。另外,注意
ligase buffer,用新的,这个容易降解。
4. good control。应该是ligation的问题。
5. 为什么要用CIP。质粒是用单一酶切的吗?如果是用的单一酶切的,可能必须使用
CIP防止自连。我们一般用两种不同酶切,这样可不用CIP处理。保证两个酶切完全的情
况下自身连接机率很小。以前用过一次CIP,效果很不好,也是不长克隆菌,有可能的
话建议避免使用。有研究表明CIP如果过度处理会部分甚至完全切掉sticky end。
另外,需要考虑一下,你这个克隆,是否对e.coli有toxic作用而使其不长或生长极缓
慢。
祝成功。
bless all!
w********a
发帖数: 324
11
一般Vector在酶切以后要进行去磷处理,以防ligation的时候自链。
那么我如果用PCR的方法扩增得到的blunt end的Vector的 PCR 产物,在进行ligation
插入insert之前,是不是最好也要进行去磷处理??
谢谢!
s**2
发帖数: 1287
12
order two oligos (add overhangs for ligation),
mix at 1:1 molar ratio,
boil,
cool down slowly to anneal,
ligate with your cut vector.
l******u
发帖数: 936
13
来自主题: Biology版 - 快来看,Epigenetics新技术来了
the technology is original from Ulf Landegren lab from Uppsala University,
Sweden. Ulf is a member of the royal swedish academy of sciences, he
invented Pad Lock Probe and Proximity ligation assay. The technologies in
the paper are based on Proximity Ligation assay + RCA (rolling circle
amplification).

in
x**2
发帖数: 255
14
来自主题: Biology版 - 分子克隆高手进来看看
我最近在做triple ligation,试过不同的insert1:insert2:vector ratio(1:1:1,
3:3:1和6:6:1)但是都不成功。请问有什么诀窍么?
我的insert已经克隆到其他vector了,所以我知道双酶切没有问题。同样我也知道双酶
切的vector没有问题。在连接体系中我的dna浓度是150ng/20ul,之后16度用NEB的T4连
接酶过夜后转化到学校自己生产的DH5alpha competant cell中,有过几个菌落,但都
不是想要的。
请问有什么诀窍么?
谢谢!
我现在只好先连接上一个片段,再连另一个了。

ligation
y******s
发帖数: 92
15
来自主题: Biology版 - 分子克隆高手进来看看
太扯了
triple-ligation的难度提高10倍吧

ligation
x**2
发帖数: 255
16
来自主题: Biology版 - 分子克隆高手进来看看
我最近在做triple ligation,试过不同的insert1:insert2:vector ratio(1:1:1,
3:3:1和6:6:1)但是都不成功。请问有什么诀窍么?
我的insert已经克隆到其他vector了,所以我知道双酶切没有问题。同样我也知道双酶
切的vector没有问题。在连接体系中我的dna浓度是150ng/20ul,之后16度用NEB的T4连
接酶过夜后转化到学校自己生产的DH5alpha competant cell中,有过几个菌落,但都
不是想要的。
请问有什么诀窍么?
谢谢!
我现在只好先连接上一个片段,再连另一个了。

ligation
y******s
发帖数: 92
17
来自主题: Biology版 - 分子克隆高手进来看看
太扯了
triple-ligation的难度提高10倍吧

ligation
f**********e
发帖数: 1994
18
CG (GNOM) 不賣測序平台,不賣 reagent,profit 太有限。賣資料/服務/解讀/分析的
獲利模式還有待考驗。技術上,CG 就是一個 sample prep 巨複雜無比的 SOLiD,基本
還是靠 ligation。Ligation 的信噪比驚人地不好。
最後,大部分我認識的 CG 的人都離開了。自己想好不好吧。
f**********e
发帖数: 1994
19
CG (GNOM) 不賣測序平台,不賣 reagent,profit 太有限。賣資料/服務/解讀/分析的
獲利模式還有待考驗。技術上,CG 就是一個 sample prep 巨複雜無比的 SOLiD,基本
還是靠 ligation。Ligation 的信噪比驚人地不好。
最後,大部分我認識的 CG 的人都離開了。自己想好不好吧。
s****l
发帖数: 10462
20
有人愿意讨论这里面提及的测序技术吗?优缺点,可行性,第一手经验等等
这里面谁现在是赢家很清楚,但是可见的将来和更远的将来谁会赢?
http://cen.acs.org/articles/92/i33/Next-Gen-Sequencing-Numbers-
全文拷贝如下
试试看图能不能贴上
/1407973177171.jpg
/1408028636124.jpg
OVER STORY
Next-Gen Sequencing Is A Numbers Game
As technical and cost barriers fall, instrument firms move their systems
into research and clinical markets
By Ann M. Thayer
Department: Business
Keywords: instrumentation, gene sequencing, diagnostics, genomics, cancer
[+]Enlarge
09233-cover-Openercxd_17647969-690
A... 阅读全帖
D***a
发帖数: 516
21
来自主题: Biology版 - 3X repeat 克隆请教
从一篇文章上抄来的:
cDNA encoding 'artificial' SUMO-2 'polymers' was generated by ligating PCR
products encoding DeltaN11–SUMO-2 while simultaneously digesting with
restriction enzymes specific for BamHI (N-terminal site) and BglII (C-
terminal site) in T4 DNA ligase buffer, 150 mM NaCl, 0.1 mg ml- 1 BSA at 22
°C for 5 h (enzymes and buffers from New England Biolabs). This created a
range of cDNAs encoding DeltaN11–SUMO-2 cDNA 'monomers' and 'multimers'
that were separated by agarose gel electrophoresis ... 阅读全帖

发帖数: 1
22
来自主题: Biology版 - 现在Hi-C一般要测多少reads?
proximal ligation assay (PLA)
分别用biotin-DNA FISH探针标记两个区域,用streptavidin的抗体检测,两个抗体只
有足够近才会发光。我记得我以前说过这种方法、版上还有人试了
就是结合原位DNA-ISH和PLA (proximity ligation assay)。两个特定区域的biotin
标记的DNA探针,如果结合的足够近(<40nm),用PLA标记的二抗可以检测到发光。

:这个后期筛细胞时间太长了吧,有没有比较直接的办法观察两个序列互相靠近。
x********u
发帖数: 390
23
来自主题: Chemistry版 - 求文献
1. Y.Z. Xu and E.T. Kool, Tetrahedron Lett., 1997, 38, 5595-5598
2.El-Sagheer AH, Cheong VV, Brown T.,Rapid chemical ligation of
oligonucleotides by the Diels-Alder reaction, Org Biomol Chem. 2011 Jan 7;9(
1):232-5.
3. Sergei M. Gryaznov, Robert L. Letsinger, Chemical ligation of
oligonucleotides in the presence and absence of a template, J. Am. Chem. Soc
., 1993, 115 (9), pp 3808–3809
Thank you a lot for your help!!!
x********u
发帖数: 390
24
来自主题: Chemistry版 - help for papers, thanks a lot.
1. Y.Z. Xu and E.T. Kool, Tetrahedron Lett., 1997, 38, 5595-5598;http://www.sciencedirect.com/science/article/pii/S0040403997012665
2.El-Sagheer AH, Cheong VV, Brown T.,Rapid chemical ligation of
oligonucleotides by the Diels-Alder reaction, Org Biomol Chem. 2011 Jan 7;9(
1):232-5. http://pubs.rsc.org/en/content/articlelanding/2011/ob/c0ob00451k
3.Sergei M. Gryaznov, Robert L. Letsinger, Chemical ligation of
oligonucleotides in the presence and absence of a template, J. Am. Chem. Soc
., 1993, 11... 阅读全帖
D********g
发帖数: 533
25
hmmm... then the copper may be ligated via pyridyl groups... I also want to
know the tricks... since my polymer also can form ligation with copper and
after twice the column and it is still light green. However, isopropyl
alcohol definitely cannot get any ligands out, at least for my polymer.
Good luck.

poly(
N***a
发帖数: 149
26
来自主题: MedicalCareer版 - MEDICAL ETHICS 137 cases
MEDICAL ETHICS 137 cases:
________________________
1. A 25- year old mother refused immunization for her 2-month old son. The
social worker spoke to the mother. (Important for Board examination)
Next step in management: immunization should be given for the benefit of the
child.
2. A 30-year old mother refused surgery for suspected appendicitis for her 6
-year old daughter. The social worker spoke to the mother. (Important for
Board examination)
Next step in management: surgical removal of the ap... 阅读全帖
b*****l
发帖数: 8603
27
2007年的,不知道你们说的是不是这个。祝好。
medical ethics more than hundred cases
Sep 24th, 2007, 12:17pm
1. A 25- year old mother refused immunization for her 2-month old son. The
social worker spoke to the mother. (Important for Board examination)
Next step in management: immunization should be given for the benefit of the
child.
2. A 30-year old mother refused surgery for suspected appendicitis for her 6
-year old daughter. The social worker spoke to the mother. (Important for
Board examination)
Next step in ma... 阅读全帖
N*********6
发帖数: 2302
28
【 以下文字转载自 ebiz 讨论区 】
发信人: Narcissus26 (王语嫣), 信区: ebiz
标 题: (Got)帮师弟寻找一个postdoc 位置 in USA,谢谢 (转载)
发信站: BBS 未名空间站 (Sat Jan 23 18:33:04 2016, 美东)
发信人: Narcissus26 (Jane), 信区: Biology
标 题: (Got)帮师弟寻找一个postdoc 位置 in USA,谢谢
发信站: BBS 未名空间站 (Tue Dec 29 08:56:37 2015, 美东)
感谢海外华人第一站!
我的精神家园!
这里记录了我奋斗的青春。
I will pay you back!
***********************
人在国内,有11篇文章。有兴趣的PI, 请email me ::[email protected]
/* */
谢谢!
1. Kang H, Cao S, Chen T, Jiang Z, Liu Z, Li Z, Xu Q, Lin Q, WeiS. The poor
recovery of ne... 阅读全帖
X1
发帖数: 1823
29
德国人发明的,G-spot就是以他的姓的第一个字母命名的
不过中国用的是很落后的造型,而且搞成医生也不能取环,对人体伤害很大:
China[edit]
In China, the mass use of IUDs by state health services was part of the
government's efforts to limit birth rates. From 1980 to 2014, 324 million
women were inserted with IUDs after having the first child, in addition to
107 million who were sterilized by tubal ligation after having the second
child. Women who refused – many resented – could lose their government
employment and their children could lose access to public ... 阅读全帖
m*********a
发帖数: 3299
30
没有选举压力了,到今年10月,obama政府罚了美国六大银行1030亿美元。包括最近
Chase卖次级贷款的130亿美元。还有1000亿美元的ligation在进行中。
不用想,现在华尔街想杀obama心都有了。
N*********6
发帖数: 2302
31
【 以下文字转载自 Biology 讨论区 】
发信人: Narcissus26 (Jane), 信区: Biology
标 题: (Got)帮师弟寻找一个postdoc 位置 in USA,谢谢
发信站: BBS 未名空间站 (Tue Dec 29 08:56:37 2015, 美东)
感谢海外华人第一站!
我的精神家园!
这里记录了我奋斗的青春。
I will pay you back!
***********************
人在国内,有11篇文章。有兴趣的PI, 请email me ::[email protected]
/* */
谢谢!
1. Kang H, Cao S, Chen T, Jiang Z, Liu Z, Li Z, Xu Q, Lin Q, WeiS. The poor
recovery of neuromyelitis optica spectrum disorder is associated with a
lower level of CXCL12 in the human brain. J Neuroimm, 289:56-6... 阅读全帖
A********e
发帖数: 354
32
【 以下文字转载自 Biology 讨论区 】
发信人: albertsmwk (.)(.), 信区: Biology
标 题: 第一批“青年千人计划”生物类@publication列表@
发信站: BBS 未名空间站 (Thu Aug 18 15:04:16 2011, 美东)
花了一个小时,深深的鄙视一下自己的无聊行径!!
125 蔡亮 男 1980年11月 复旦大学 生命
科学 2007年12月毕业于[美国]北卡大学 [美国]加州大学旧金山分校 博士后
Cai L, Mostov K. Polarity is destiny. Cell. 2009 Nov 13;139(4):660-2. PubMed
PMID: 19914162; PubMed Central PMCID: PMC2900917.
Cai L, Makhov AM, Schafer DA, Bear JE. Coronin 1B antagonizes cortactin and
remodels Arp2/3-containing actin branche... 阅读全帖
s*********e
发帖数: 77
33
来自主题: Medicine版 - Re: 试管婴儿 方面的知识
depends on what is wrong with her tubes. adhesions can be treated easily with
ligation here, i think about 60-70% successful rate. don't know what it is
in china though. if the problem is caused by the cilia, ivf is appropriate.
you can always ask your/your wife's ob/gyn doctor, or post your question on
www.webmd.com
good luck.
D*********n
发帖数: 674
34
来自主题: NextGeneration版 - 戒除坐月子,戒除用月嫂
I can't find the UN funded study broadcasted by NPR.
Here is another one mention don't use rice wine.
http://www.cambodiadaily.com/archives/despite-remarkable-progre
SUBSCRIBE | ADVERTISE
The Cambodia Daily
Wednesday, August 13, 2014
NEWS BUSINESS FEATURES ARCHIVES ABOUT US
Despite Remarkable Progress, Childbirth in Cambodia is Still Too Risky
BY DAVID SHAFTEL AND KUCH NAREN | JUNE 21, 2003
Oum Phoeun knows about birth spacing. She knows about birth control as well.
Her first four pregnancies we... 阅读全帖
f******s
发帖数: 314
35
来自主题: Returnee版 - 突然发现姚庆伟他导师很变态啊
姚庆伟 教授
天津大学特聘教授 天津市特聘专家
移动电话:15xxxxxxxxxxx
办公室:022-xxxxxxxxx
Email: x*[email protected]; x**[email protected]
教育背景
l 山西医科大学,学士, 1983
l 山西大学,硕士, 1988
l 伊利诺伊大学-芝加哥分校(Chicago), 博士, 1991
l 哥伦比亚大学(New York), 博士后, 1996-1998
工作经历
l 山西医科大学,助教, 1983-1985
l 山西大学,讲师, 1988-1991
l 北伊利诺伊大学 (DeKalb), 助理教授(tenure track), 1998-2003
l 北伊利诺伊大学 (DeKalb), 副教授(tenured), 2003-2010
研究方向
l 有机合成化学,有机合成方法,过渡金属化学及催化
l 自由基化学,有机反应机理,组合化学
... 阅读全帖
p*******g
发帖数: 2976
36
【 以下文字转载自 Biology 讨论区 】
发信人: albertsmwk (.)(.), 信区: Biology
标 题: 第一批“青年千人计划”生物类@publication列表@
发信站: BBS 未名空间站 (Thu Aug 18 15:04:16 2011, 美东)
花了一个小时,深深的鄙视一下自己的无聊行径!!
125 蔡亮 男 1980年11月 复旦大学 生命
科学 2007年12月毕业于[美国]北卡大学 [美国]加州大学旧金山分校 博士后
Cai L, Mostov K. Polarity is destiny. Cell. 2009 Nov 13;139(4):660-2. PubMed
PMID: 19914162; PubMed Central PMCID: PMC2900917.
Cai L, Makhov AM, Schafer DA, Bear JE. Coronin 1B antagonizes cortactin and
remodels Arp2/3-containing actin branche... 阅读全帖
k******n
发帖数: 61
37
高中同学在国内学医的。说这个钛夹钳ebay上面50刀,但是国内要卖4000块。
http://www.ebay.com/itm/Weck-Horizon-Small-Manual-Load-Ligating
请问大家有没有懂行的?这个小东西可以人肉回去吗?东西不大,比普通家用剪刀还小
一些。就是不太清楚这种东西可不可以带回去,有什么要注意的?
c***l
发帖数: 59
38
if what reported by WSJ is true. The main impact looks like will be civil
ligation.
don't know how much BAC set aside for the lawsuite. But the potential
costs for representations and warranties could be much lower that some
estimation. It will be tough for investors or monoline insurers to win their
repurchase requests since they need prove the breach is materials.
The requests from those GSE will be the key, i believe at least half of
request come from them based on the size of their holding.... 阅读全帖
a*******1
发帖数: 701
39
来自主题: Working版 - 老娘跟你死磕
说的是。关键是我觉得这破事搞得我烦心。我朋友建议我,直接丢给律师,让律师对付
他们去,然后你就做你自己的事。律师让你干啥你就干啥。我的心理医生也这么建议,
他说,律师发个律师函比你天天找人事部都有用。每个公司都不想有ligatation的记录。
中国人单枪匹马在美国不容易,律师的话,他们欺负你不熟悉美国的文化、语言和法律
。律师说,老美很欺负人的,你硬他就软。
c*****x
发帖数: 83
40
来自主题: Immigration版 - review opportunity 1分多 脾脏病理
一分多杂志,关键字: Hypersplenism ; Ligation of splenic artery ; Partial
splenic embolization ; Case
report。
有兴趣而且专业符合的话,请站内告诉您的E-mail address,Name, Affiliation(单
位),简单cv, research area. 发至站内。
x******i
发帖数: 14369
41
咱是个小护士:)
建议所有男士都考虑VASECTOMY,痛苦小,不需要上医院。相比之下女的做TUBAL
LIGATION(输卵管结扎)对身体的伤害就大多了。
w**y
发帖数: 93
42
I have some questions about that.
O***n
发帖数: 13127
43
【 以下文字转载自 Biology 讨论区 】
发信人: albertsmwk (.)(.), 信区: Biology
标 题: 第一批“青年千人计划”生物类@publication列表@
发信站: BBS 未名空间站 (Thu Aug 18 15:04:16 2011, 美东)
花了一个小时,深深的鄙视一下自己的无聊行径!!
125 蔡亮 男 1980年11月 复旦大学 生命
科学 2007年12月毕业于[美国]北卡大学 [美国]加州大学旧金山分校 博士后
Cai L, Mostov K. Polarity is destiny. Cell. 2009 Nov 13;139(4):660-2. PubMed
PMID: 19914162; PubMed Central PMCID: PMC2900917.
Cai L, Makhov AM, Schafer DA, Bear JE. Coronin 1B antagonizes cortactin and
remodels Arp2/3-containing actin branche... 阅读全帖
A***a
发帖数: 641
44
sounds pretty good deal. so what discount are you using?
i met one orthodontist around our area, and got quoted about 4880 for 3M
self-Ligating braces.not sure if there is any other discount except the 5%
off with full payment in cash.
N*********6
发帖数: 2302
45
【 以下文字转载自 Biology 讨论区 】
发信人: Narcissus26 (Jane), 信区: Biology
标 题: 帮师弟寻找一个postdoc 位置,谢谢
发信站: BBS 未名空间站 (Tue Dec 29 08:56:37 2015, 美东)
人在国内,有11篇文章。有兴趣的PI, 请email me ::[email protected]
/* */
谢谢!
1. Kang H, Cao S, Chen T, Jiang Z, Liu Z, Li Z, Xu Q, Lin Q, WeiS. The poor
recovery of neuromyelitis optica spectrum disorder is associated with a
lower level of CXCL12 in the human brain. J Neuroimm, 289:56-61, 2015.(co-
first author)
2. Chen T, Li Z, Jiang Z, Liu Z, Xu Q, Huang D, Lin Q, Wei.S (... 阅读全帖
t**y
发帖数: 310
46
你也知道ligation?
李嘉欣这个词比较少见,你是搞生物的?
N******t
发帖数: 16051
47
来自主题: pets版 - 有什么避孕方法
vasectomy 和 tubal ligation?
回国做太不靠谱了
lz做了这个,准备养一公一母两狗让他们随时嘿休么?万一手术失败了,生出小狗了才
知道咋办?
n*****g
发帖数: 4117
48
来自主题: NJU版 - 干旱
staudinger ligation?
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