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全部话题 - 话题: fraction
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c********r
发帖数: 189
1
Histone H3 不应该主要在nuclei里吗?为啥我做cell fractionation, 分离nuclear和
cytoplasmic fraction, 每次western blot里cytoplasmic fraction的histone H3 最
多。
cell fractionation的问题 还是抗体的问题,还是本来就是如此?郁闷啊。
c********r
发帖数: 189
2
Histone H3 不应该主要在nuclei里吗?为啥我做cell fractionation, 分离nuclear和
cytoplasmic fraction, 每次western blot里cytoplasmic fraction的histone H3 最
多。
cell fractionation的问题 还是抗体的问题,还是本来就是如此?郁闷啊。
L******k
发帖数: 33825
3
【 以下文字转载自 NewYork 讨论区 】
发信人: LXJSmonk (紫色心情的 LXJS NYC_monk), 信区: NewYork
标 题: 关于equivalent fractions的讨论
发信站: BBS 未名空间站 (Fri Nov 19 21:36:47 2010, 美东)
发信人: LXJSmonk (紫色心情的 LXJS NYC_monk), 信区: Education
标 题: 关于equivalent fractions的讨论
发信站: BBS 未名空间站 (Fri Nov 19 17:42:55 2010, 美东)
11/19/10 Friday
I had a discussion today with my collaborating teachers at TMA about equival
ent fractions. what's the difference between [reduce] and [simplify]?
中文好像没这个疑惑, 中文我们是说 化简 或者 约分 一个分数吧? 还是怎么说的?
w*******y
发帖数: 60932
4
Learning Resources Rainbow Fraction Tiles with Tray $4.05 free shipping with
Prime (FSSS) from Amazon
Set of 51 color-coded proportional plastic pieces represents a whole, halves
, thirds, fourths, fifths, sixths, eighths, tenths and twelfths. Includes 9"
x 10" plastic tray, Teacher's Guide and two sheets of stickers.
Learning Resources Rainbow Fraction Tiles with Tray:
http://www.amazon.com/Learning-Resources-Rainbow-Fraction-Tiles
$4.05
w*******y
发帖数: 60932
5
Learning Resources Rainbow Fraction Tiles with Tray $3.85 free shipping with
Prime (FSSS) from Amazon
Set of 51 color-coded proportional plastic pieces represents a whole, halves
, thirds, fourths, fifths, sixths, eighths, tenths and twelfths. Includes 9"
x 10" plastic tray, Teacher's Guide and two sheets of stickers.
Learning Resources Rainbow Fraction Tiles with Tray:
http://www.amazon.com/Learning-Resources-Rainbow-Fraction-Tiles
$3.85
L******k
发帖数: 33825
6
来自主题: NewYork版 - 关于equivalent fractions的讨论
【 以下文字转载自 Education 讨论区 】
发信人: LXJSmonk (紫色心情的 LXJS NYC_monk), 信区: Education
标 题: 关于equivalent fractions的讨论
发信站: BBS 未名空间站 (Fri Nov 19 17:42:55 2010, 美东)
11/19/10 Friday
I had a discussion today with my collaborating teachers at TMA about equival
ent fractions. what's the difference between [reduce] and [simplify]?
中文好像没这个疑惑, 中文我们是说 化简 或者 约分 一个分数吧? 还是怎么说的?
s******y
发帖数: 220
7
要检验一个transcrption factor的activation。(Cn-NFAT pathway),
NFAT被去磷酸化后,从cytosol入核。所以打算提取nuclear fraction检验NFAT 蛋白水
平。
我用了pierce 的kit, 不好用, 结果不make sense。
自己试了几个protocol, 背景太高,结果也不理想。
请教做过类似实验的xdjm 推荐个protocol,或者kit也成,能提取nuclear fraction
!多谢!
V********n
发帖数: 305
8
H3在cyto里检测到是有可能的,但如果cyto里多,就不太对了。H3应该和DNA结合很牢
,其实并不是一个很好的Nu. marker,因为可能会造成分离假象 --- cyto fraction被
Nu protein轻微污染,但无法检测到H3。
不知道LZ如何用镜检确定的细胞fractionation。cyto里面有H3,首要怀疑的还是裂解
过程出错,buffer或者操作。
不急,慢慢来。
V********n
发帖数: 305
9
H3在cyto里检测到是有可能的,但如果cyto里多,就不太对了。H3应该和DNA结合很牢
,其实并不是一个很好的Nu. marker,因为可能会造成分离假象 --- cyto fraction被
Nu protein轻微污染,但无法检测到H3。
不知道LZ如何用镜检确定的细胞fractionation。cyto里面有H3,首要怀疑的还是裂解
过程出错,buffer或者操作。
不急,慢慢来。
c**y
发帖数: 127
10
请教各位大虾,
根据大家经验,觉得哪家公司的
Nucleo-cytoplasmic fractionation kit分离后的fraction比较纯,contamination比
较少?
多谢!
r******k
发帖数: 446
11
If i used whole cell lysis ( with our cell fractionation), i saw very
abundance of protein bands with the stain of ponceau S. However, after i
fractionated the sample, it seems nothing can be detected, even in the
cytosol. I have no idea why. 难道cyto/nucleus被抽出来的过程会使得蛋白降解?
h***e
发帖数: 782
12
请教关于解fractional partial differential equation的问题
比如最简单的ADE,假如从integral order 变成 fractional order, 算法该怎么变化?
有什么reference 可以推荐? 多谢了。
w********h
发帖数: 12367
13
ft....now matter how to dissolve the sol fraction,
the final gel fraction will be fixed bah....
in my case, I use THF on Soxhlet extraction apparatus.

o****o
发帖数: 8077
14
【 以下文字转载自 Economics 讨论区 】
发信人: oloolo (戒网几天), 信区: Economics
标 题: any one knows if SAS could do Fractional Logit Model fit?
发信站: BBS 未名空间站 (Tue Feb 20 15:16:45 2007)
anyone knows if SAS could do the quasi-ML estimate of fractional Logit Model
of Woodridge etc '96?
I currently use PROC NLMIXED to fit it, looks good, but not the original quasi-
ML, rather the ML estimation
o******6
发帖数: 538
15
☆─────────────────────────────────────☆
purelens (热湾) 于 (Sat May 3 15:46:32 2008) 提到:
Hi All,
Could anyone here kindly advise me how to convert decimal-number to fraction
in R, such as 0.015625 to 1/64 ?
Thank you and appreciate your big help.
☆─────────────────────────────────────☆
kunkunred (血红) 于 (Mon May 5 16:46:46 2008) 提到:
I don't know R, but mathematically you want to do the following.
Here's how to convert 0.015625 to a fraction ...
There is not much that can be d
N********n
发帖数: 8363
16
【 以下文字转载自 Stock 讨论区 】
发信人: NeverLearn (24K Golden Bear), 信区: Stock
标 题: Fraction ... Er ... Fictional Reserve Banking (zz)
发信站: BBS 未名空间站 (Mon Mar 22 23:53:55 2010, 美东)
As the New York Federal Reserve Bank explains on its website:
Reserve requirements affect the potential of the banking system to
create transaction deposits. If the reserve requirement is 10%, for example,
a bank that receives a $100 deposit may lend out $90 of that deposit. If
the borrower then writes a check to someone wh
c**********s
发帖数: 12
17
Explain Fractional Factorial Design in 1 concise paragraph so that anybody
can understand it.
多谢!
m**********a
发帖数: 370
18
中文叫舞茸地复仙,英文名叫maitake D fraction
这是治疗什么的药?
E*********e
发帖数: 10297
19
嗯,改得满好的
不过她说reduce frations into lowest terms也不算错,数学教科书是这么说的
还有一种说法是write fractions in the simplest form,前者用得多

bigger
if
numberS
E*********e
发帖数: 10297
20
嗯,改得满好的
不过她说reduce frations into lowest terms也不算错,数学教科书是这么说的
还有一种说法是write fractions in the simplest form,前者用得多

bigger
if
numberS
k******s
发帖数: 237
21
不多发贴发表言论 少说为妙。
天天批评我的英文, 不知道为什么? 连我的美国朋友对我的英文没有这么大的抵触情
绪,我们之间EMAIL也就看懂就好。
我想此坛交流思想 ,用不是交流语法。重要的是把内容写清楚,用不是在上语文课。没
必要互相攻击英文。
我的问题是 How to teach Reduce fractions to lowest terms?到目前为至, 没有
人给我答案。我想知道除了 divisibility rule 有所帮助, 是否有更好的办法.
c******c
发帖数: 30
22
来自主题: NewYork版 - 什么是FRACTIONAL OWNERSHIP ?
是关于CONDO的描述。这是什么情况呢:
FRACTIONAL OWNERSHIP CONDO AT THE ST. REGIS NEW YORK. This Elegant Two
Bedrooms and Three Bathrooms Home is Located in the Heart of Midtown East of
Manhattan Steps Away from Central Park, MOMA and Top Designer Boutiques.
This 935 Unit has a Fixed Week Number 24 Plus 21 Extra Floating Nights per
Year.
http://www.zillow.com/homedetails/2-E-55th-St-935-New-York-NY-1
d*j
发帖数: 13780
23
来自主题: Collectibles版 - 2009 fractional gold eagle UNC
这个可以买吧?
and now APMEX is rewarding you with 2009 Fractional American Gold Eagle coin
s. APMEX is the first dealer to be able to provide these highly anticipated
coins to you.
t****0
发帖数: 330
24
USmint said Due to the continued, sustained demand for American Eagle Gold
Bullion Coins, 2009-dated American Eagle Gold Uncirculated Coins will not be
produced.
but APMEX has Fractional American Gold Eagle Coins in stock and ready to
ship.
Where do you get those coins? from other mint?
B****g
发帖数: 77
25
就好象3/7 和 15/35 一样。数值是一样的,但是写法不同。因为fraction 之间的相等
是一个等价关系。每个分数在一个equivalent class 里面。
c****s
发帖数: 2487
26
来自主题: TeX版 - diagonal fraction?
sorry, don't know if the name is correct...
let's say \frac{b}{a} renders a vertical fraction
and b/a gives a horizontal one
is it possible to make something in between?
that's, b at 10 o'clock and a at 4 o'clock
many thx!
j*******8
发帖数: 933
27
Dear DaNiu in Neuroscience, help me please!!!!
I'm testing protein interaction in the post-synaptic density (PSD) fraction
of brain tissue. Usually, we use 1% SDS to dissolve the PSD pellet. However,
we're now planning to test protein interaction with IP. So, my questions
are: does 1% SDS interupt protein interaction? if does, what should I use to
dissolve PSD? Many thanks (and baozi if I have any).
h*******n
发帖数: 2052
28
co-ask for cytoskeleton fraction
j*****a
发帖数: 92
29
如果His tagged protein is present in the soluble fraction是否可以直接做kinetic assay?
n***w
发帖数: 2405
30
no.
after your extraction, if most fusion protein is present in the soluble
fraction instead of solubilized pellet, then you can assume there may not be
inclusion bodies.
j*****a
发帖数: 92
31
His tagged protein is present in the soluble fraction, 是否可以直接做kinetic
assay?
c********r
发帖数: 189
32

Lysis buffer 绝对是对的,我用了好几种,而且都在显微镜下观察了。老是在
cytoplasmic fraction 一大堆的H3,太让我伤心了~
V********n
发帖数: 305
33
嗯,如果是这样的话,H3是很好的marker。
俺还是觉得问题出在细胞裂解,不知道你镜下观测细胞核用的是什么染色。如果是直接
bind到DNA上的如DAPI之类,只要DNA不被降解,都可以染出来,无法提示你关于
fractionation的信息。
如果你还是相信你的操作,做个H3的IF看看。也许是重大发现?
S******e
发帖数: 36
34
我曾经试过用不同的方法裂解细胞,比方说用低渗Buffer(10 mM HEPES (pH 7.9), 10
mM KCl, 1.5 mM MgCl2)溶胀细胞后,dounce 10次或者加1%NP40,每次我都用普通的
相差显微镜检查过细胞,溶胀后细胞膜没破,但Dounce或者加入NP40后,90%以上细胞
膜破掉,细胞核似乎还是完整的。可是当做WB时候,很多只在核内的蛋白(比方说转录
因子)都可以明显的在cyto的fraction里边检测到,我估计还是有渗漏。你能检测到H3
可能也是这个原因?
c********r
发帖数: 189
35

10
H3
最后发现时H3 抗体的问题,换了种抗体,好了,一般来说transcription factor和
Histone 之类的都应该主要在nuclear fraction里
c********r
发帖数: 189
36

Lysis buffer 绝对是对的,我用了好几种,而且都在显微镜下观察了。老是在
cytoplasmic fraction 一大堆的H3,太让我伤心了~
V********n
发帖数: 305
37
嗯,如果是这样的话,H3是很好的marker。
俺还是觉得问题出在细胞裂解,不知道你镜下观测细胞核用的是什么染色。如果是直接
bind到DNA上的如DAPI之类,只要DNA不被降解,都可以染出来,无法提示你关于
fractionation的信息。
如果你还是相信你的操作,做个H3的IF看看。也许是重大发现?
S******e
发帖数: 36
38
我曾经试过用不同的方法裂解细胞,比方说用低渗Buffer(10 mM HEPES (pH 7.9), 10
mM KCl, 1.5 mM MgCl2)溶胀细胞后,dounce 10次或者加1%NP40,每次我都用普通的
相差显微镜检查过细胞,溶胀后细胞膜没破,但Dounce或者加入NP40后,90%以上细胞
膜破掉,细胞核似乎还是完整的。可是当做WB时候,很多只在核内的蛋白(比方说转录
因子)都可以明显的在cyto的fraction里边检测到,我估计还是有渗漏。你能检测到H3
可能也是这个原因?
c********r
发帖数: 189
39

10
H3
最后发现时H3 抗体的问题,换了种抗体,好了,一般来说transcription factor和
Histone 之类的都应该主要在nuclear fraction里
T****a
发帖数: 409
40
最近在做epithelial cell fractionation。
cytoplasmic的loading control可以用GAPDH。
但membrane和nucleaus的loading control最好用什么呢?
g**f
发帖数: 50
41
I did the scatter plots, but I can't find a good curve fit or equation for
them. This is surviving fraction in response to radiation exposure. Please
help. Thanks a lot!
m*****r
发帖数: 1164
42
来自主题: Biology版 - 请教protein fractionation
有人用过thermal scientific的这个subcellular protein fractionation kit的么
http://www.piercenet.com/previews/2012-articles/subcellular-pro
r******k
发帖数: 446
43
来自主题: Biology版 - cell fractionation的问题
小弟最近做cell fractionation。 用的pierce的kit。 结果用alpha tublin做
cytosolic marker, p-a84做nuclear marker。 竟然观察到tublin在nucleus也有少量
表达,这是为啥呢?难道真有cytosol的污染? 还是应该换一个cytosolic marker呢?
跪谢!
r******k
发帖数: 446
44
来自主题: Biology版 - cell fractionation的问题
谢谢!
但是看到文章上做完cell fractionation发觉他们nucleus里面一点都不能检测到
tublin。 。。。
r******k
发帖数: 446
45
为啥做了cell fractionation以后,用立春红染色之后发现 nucleus的那几个lane都染
不上,但是western之前都做了protein quantification了,是有蛋白的呀。。。。。
。 哪位大神有经验吗?
i***l
发帖数: 1656
46
1. Ponceau is not sensitive enough and your samples are composed of many
bands each with low quantity of protein
2. ponceau may not be able to stain certain proteins in your fractions
r******k
发帖数: 446
47
我试了试用293t细胞做cell fractionation,但是总是有cytosol的marker在nucleus的
extract里面。是不是这种细胞不好做呢?我用别的细胞做没那么严重。。。
L******k
发帖数: 33825
48
来自主题: Education版 - 关于equivalent fractions的讨论
11/19/10 Friday
I had a discussion today with my collaborating teachers at TMA about equival
ent fractions. what's the difference between [reduce] and [simplify]?
中文好像没这个疑惑, 中文我们是说 化简 或者 约分 一个分数吧? 还是怎么说的?
c*s
发帖数: 2145
49
来自主题: Macromolecules版 - how to fraction PEG?
I have commercial PEG (poly ethylene glycol) but their PDI is relatively
high (~1.2). How to fraction it to get narrower PDI, hopefully <1.10?
thanks
s****e
发帖数: 2934
50
来自主题: Macromolecules版 - [合集] how to fraction PEG?
☆─────────────────────────────────────☆
cds (红毛呼呼猪) 于 (Sat Sep 30 22:40:16 2006) 提到:
I have commercial PEG (poly ethylene glycol) but their PDI is relatively
high (~1.2). How to fraction it to get narrower PDI, hopefully <1.10?
thanks
☆─────────────────────────────────────☆
agostic (若即若离) 于 (Sun Oct 1 00:43:12 2006) 提到:
HPLC?

☆─────────────────────────────────────☆
cds (红毛呼呼猪) 于 (Sun Oct 1 16:13:00 2006) 提到:
now they ceased to provide this Mw peg LE
☆───────────────────────────
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