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全部话题 - 话题: fragment
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m********e
发帖数: 4403
1
来自主题: Seattle版 - 灯泡怎么扔啊?
http://greenopedia.com/article/how-recycle-or-dispose-light-bul
How to recycle or dispose of light bulbs
by Sheryl Ryan
Although light bulbs are encased in glass, they cannot be recycled in
regular office or household recycle bins. Light bulbs that contain mercury
or other toxic elements typically need to be recycled as hazardous waste,
while all other light bulbs can usually be disposed of in the regular trash.
Dispose of incandescent light bulbs
Most cities do not accept traditional incandesce... 阅读全帖
l***a
发帖数: 2677
2
556不是主要靠Fragmentation杀伤吗,都钢芯了还Fragmentation吗?
S**********s
发帖数: 4534
3
来自主题: GunsAndGears版 - 家防霰弹枪选择
Not an expert, but if you want my opinion, with a rifle and carbine setup (
14.5-20), anything that feeds reliably is fine, as long as their velocity
can exceed the 223 FMJ fragmentation velocity of 2700 fps at face to face
distance.
M855 provides slightly better barrier penetration since it has a steel core.
If you use sub carbine (11") or even pistol (7.5") setup, I recommend
Hornady 75gr TAP.
The OTM type bullet fragments reliably at lower velocity ~2200fps and is
favored by both law enforcem... 阅读全帖
S**********s
发帖数: 4534
4
来自主题: GunsAndGears版 - 防弹衣看来看去
the way hard armor plate is designed, it breaks up high velocity projectiles
into fragments upon impact so even if the projectile ended up penetrating
the hard plate, the fragments will be stopped by the soft armor.
just to be safe, i don't thin reversing the plate is a good idea, unless it'
s a stand alone plate (level III in the front and soft armor in the back),
that way you can insert the plate behind your soft armor.
Maybe you can get some plates that already has anti-spalling - most likely... 阅读全帖
C***t
发帖数: 10731
5
来自主题: TVGame版 - 南梦宫Sale on PSN
那个新SAO有点兴趣 有玩过的来说说吗 听说是怪物猎人型的
PlayStation 4
Attractio – $13.99
Dark Souls 2: Scholar of the First Sin – $19.99
Dragon Ball Xenoverse – $15.99
Dragon Ball Xenoverse Season Pass – $14.99
Dragon Ball Xenoverse Game + Season Pass – $25.99
J-Stars Victory VS+ – $14.99
One Piece: Pirate Warriors 3 – $23.99
One Piece: Pirate Warriors 3 Season Pass – $8.99
Project CARS – $15.99
Sword Art Online: Lost Song – $29.99
Sword Art Online RE: Hollow Fragment – $4.99
Tales of Zestiria – $29.99
PlayStation 3
Dark... 阅读全帖
v********e
发帖数: 1058
6
by this standard the preludes are hopeless.
The romantic generation has an aesthetics of their own. They find beauties
in fragments, works that start from the middle and end without resolutions.
Some lieder by Schumann are examples of this taste for transitory beauties.
Many of Chopin's preludes fall in this category. Most of his nocturnes have
a larger structure than such fragments, but the majority of they simply are
not meant to express dramatics or to tell epics, which are more typical of
so
h**c
发帖数: 2376
7
来自主题: LeisureTime版 - 梦中的风车 (我的翻译) (转载)
注:并没有全部按原文意思,诚惶诚恐中,希望喜欢这首歌的人别太抨我。:)
转贴到这里,一来答谢乐子等弟兄一直以来的厚爱,
二来。。风车兄最近很活跃,给他加油!~ :):)
下面是youtube和原歌词。谢谢大家。*_*
Round, like a circle in a spiral
Like a wheel within a wheel.
Never ending or beginning,
On an ever spinning wheel
Like a snowball down a mountain
Or a carnaval balloon
Like a carousell that's turning
Running rings around the moon
Like a clock whose hands are sweeping
Past the minutes on it's face
And the world is like an apple
Whirling silently in space
Like the circles that you find
In ... 阅读全帖
a********3
发帖数: 26787
8
来自主题: LeisureTime版 - 鬼琴 电梯 & Amazon 上架了
赫赫。。。copy & paste三个鬼琴在amazon上的review哦!
写得真好! 恭喜莫哈兄~~~ 读者的feedback 都很赞啊~~~~:D
1,The story of this cursed violin is a dip of what has happened in last few
decades and is still going on in China.
2,The cover and the introductory paragraph of the book reminds me of a movie
made in 1998, The Red Violin. I thought it could be just another
reincarnation story the cursed violin made by Nicolo Bussotti. But I'm glad
I kept reading anyways. True, this is about a cursed violin, but it's a
different cursed... 阅读全帖
e******y
发帖数: 145
9
来自主题: Movie版 - 关于birth 的解释
nicole kidman 主演的birth, 有不同版本解释, 有说小男孩就是sean的转世,有说小男孩
暗恋anna, 读了信件后自欺欺人的以为自己就是sean. 大家有什么看法?
转载一段review
"I think that is a really good question: how did he know everything about
Anna's life with Sean? My thought was that he really is Sean. Reincarnation
memories (if you believe in the concept) are not served up whole, but in
fragments--fragments from a life you don't otherwise remember. It's like
putting a puzzle together without all the pieces. I think that explains how he
knew about the Santa
F**********y
发帖数: 936
10
刘路是不是欠你钱了?先是贬journal of symbolic logic为二流甚至不入流的刊物,后
又说他的结果不怎么样。
你们新加坡国立大学数学系主任在那刊物上发过一篇,你能不能问问他他的其他文章投
J.Symbolic Logic,能否投中?
他也是数理逻辑界成名的人物,看看他的论文:
1. C. T. Chong and Yue Yang, $\Sigma_2$ induction and infinite injury
priority arguments. Part I: Maximal sets and the jump operator. J. Symbolic
Logic, 63 (1998), 797-814
2. C. T. Chong and Yue Yang, $\Sigma_2$ induction and infinite injury
priority arguments. Part II: Tame $\Sigma_2$ coding and the jump operator.
Annals of Pure and Applied Logic 87... 阅读全帖
l*****e
发帖数: 112
11
A quote from:
http://www.crossroad.to/articles2/006/migration-2.htm
Dr. Senge also co-authored the report, "Communities of Commitment: The Heart
of Learning Organizations." It highlights the crisis of "fragmentation"
that keeps people from trading "divisive" Biblical views for a more systemic
or holistic perspective.:
"Fragmentation, competition, and reactiveness are not problems to be
solved -- they are frozen patterns of thought to be dissolved. The solvent
we propose is a new way of thinking,
h**c
发帖数: 2376
12
来自主题: Prose版 - 梦中的风车 (我的翻译)
注:并没有全部按原文意思,诚惶诚恐中,希望喜欢这首歌的人别太抨我。:)
下面是youtube和原歌词。谢谢大家。*_*
Round, like a circle in a spiral
Like a wheel within a wheel.
Never ending or beginning,
On an ever spinning wheel
Like a snowball down a mountain
Or a carnaval balloon
Like a carousell that's turning
Running rings around the moon
Like a clock whose hands are sweeping
Past the minutes on it's face
And the world is like an apple
Whirling silently in space
Like the circles that you find
In the windmills of your mind
Like a tunnel that you... 阅读全帖
J*****3
发帖数: 4298
13
笑死我了,还来玩黑白颠倒的吗?
我给你全文吧,这么撒谎的话,是耶稣教的吗?撒谎神不喜悦
这篇文章是基督教手册用来歪曲人类进化不成立的,是JAMES给我了文章的一个LINK,但是文章看不全,我根据作者名字找到了全文,也读了,发现,文章根本没有说进化不成立,他们断章取义,黑白颠倒地撒谎。我BS这种恶心的行为。
“5、大概在97年,一个著名的非基督徒考古学家,在非洲发现的所谓人类化石,把一
直以来公认的人类进化顺序,猿人——直立人——能人——智人,给彻底推翻了。目前
人类进化链条重新归零,变为空白。”
原文
http://news.nationalgeographic.com/news/2010/05/100506-science-
翻译:
“Even if the new result doesn't quite settle the debate about whether
Neandertals mixed with modern humans, it does underscore how different they
were from our own lineage. And t... 阅读全帖
t****e
发帖数: 2737
14
新约手抄本的依据
新约如今正不断遭受攻击,其可信度和准确性一直受到批评者质疑。但是,如果批评者
无视新约,那么他们也不能相信诸如柏拉图(Plato)、亚里士多德(Aristotle)、荷
马(Homer)等所著的史书。因为相比其他任何史书,新约文献得到更好的保护,且数
量也比其他史书多出许多。正因为新约抄本有如此之多,故而可以用“交叉校验”(
cross checked)的方法来检验抄本的准确性,并从而得出这些抄本都具有较高准确度
的结论。
现存有5686卷新约的希腊文手抄本。把新约手抄本数量与其他史书手抄本相比较,不难
发现新约手抄本远远多于其他史书。
作者 写作时间 最早抄本 原稿与抄本的时间间隔 抄本数量 抄本准确度
Lucretius 主前55-53年 1100 年 2 ----
Pliny 公元61-113年 主后 850 750 年 7 ----
Plato 主前427-347年 主后 900 1200 年 7 ----
Demosthenes 主... 阅读全帖
t****e
发帖数: 2737
15
新约手抄本的依据
新约如今正不断遭受攻击,其可信度和准确性一直受到批评者质疑。但是,如果批评者
无视新约,那么他们也不能相信诸如柏拉图(Plato)、亚里士多德(Aristotle)、荷
马(Homer)等所著的史书。因为相比其他任何史书,新约文献得到更好的保护,且数
量也比其他史书多出许多。正因为新约抄本有如此之多,故而可以用“交叉校验”(
cross checked)的方法来检验抄本的准确性,并从而得出这些抄本都具有较高准确度
的结论。
现存有5686卷新约的希腊文手抄本。把新约手抄本数量与其他史书手抄本相比较,不难
发现新约手抄本远远多于其他史书。
作者 写作时间 最早抄本 原稿与抄本的时间间隔 抄本数量 抄本准确度
Lucretius 主前55-53年 1100 年 2 ----
Pliny 公元61-113年 主后 850 750 年 7 ----
Plato 主前427-347年 主后 900 1200 年 7 ----
Demosthenes 主... 阅读全帖
w*********r
发帖数: 3382
16
来自主题: TrustInJesus版 - 勸告來辯論的基督徒
VICTIMS OF THE CHRISTIAN FAITH
"WONDERFUL EVENTS THAT TESTIFY TO GOD'S DIVINE GLORY"
Listed are only events that solely occurred on command or participation of
church authorities or were committed in the name of Christianity. (List
incomplete)
Ancient Pagans
As soon as Christianity became legal in the Roman Empire by imperial edict (
315), more and more pagan temples were destroyed by Christian mob. Pagan
priests were killed.
Between 315 and 6th century thousands of pagan believers were slain.
E... 阅读全帖
w*********r
发帖数: 3382
17
来自主题: TrustInJesus版 - 勸告來辯論的基督徒
VICTIMS OF THE CHRISTIAN FAITH
"WONDERFUL EVENTS THAT TESTIFY TO GOD'S DIVINE GLORY"
Listed are only events that solely occurred on command or participation of
church authorities or were committed in the name of Christianity. (List
incomplete)
Ancient Pagans
As soon as Christianity became legal in the Roman Empire by imperial edict (
315), more and more pagan temples were destroyed by Christian mob. Pagan
priests were killed.
Between 315 and 6th century thousands of pagan believers were slain.
E... 阅读全帖
l*****a
发帖数: 38403
18
这是你第一个连接的英文版
Origin and textual history[edit]
Modern scholarship dates the work between the 6th and 4th century BCE.[15]
While "there is an intentional editorial unity with a cohesive purpose and
message in the canonical form of the book," Job contains many separate
elements, some of which may have had an independent existence prior to being
incorporated into the present text.[16] Scholars agree that the
introductory and concluding sections of the book, the framing devices, were
composed to set ... 阅读全帖
t*******r
发帖数: 2940
19
来自主题: TrustInJesus版 - 地狱是误译
"The New Testament is one of the most attested ancient works in existence.
The Journal of Biblical Literature Vol. 87 p.184 has listed 5,255 known New
Testament Greek fragments. The Tetragrammaton does not appear in the New
Testament either as YHWH or as the Greek transliterations PIPI, YAW and Iabe
in a single one of these ancient New Testament manuscripts. This is despite
"some papyrus fragments of the Christian Greek Scriptures that go back to
the middle of the second century." (w82 3/15 p.23... 阅读全帖
p*****n
发帖数: 97
20
来自主题: Zhejiang版 - Intel ISEF 2012 Awards Announced!
一大堆从大陆来的。看来还是要拔苗助长啊。感觉很多是一个高中生在暑假里到一个实
验室作2个月试验,发个摘要。得最高奖的那个,用mesothelin早期诊断胰腺癌,基本
没有实用价值。只要胰腺有点小问题的,像胰腺炎,囊肿等mesothelin有很多都会高。
如果推广,还把人吓死。
可能更多是奖励他的给一百多个实验室拒绝后还不罢休的精神。
Documents Confidential Cabinet Based on Mobile Phone Key
BingChen Gong, 18, Middle School Attached to Northern Jiaotong University,
Beijing,
China
Innovative Application of Facial Mask as Moisture Sensor for a Low Cost
Debris
Flow Warning System
Jingjing Peng, 18, Chengdu Shude High School, Chengdu, Sichuan, China
Yuan Tian, 17, C... 阅读全帖
a***y
发帖数: 19743
21
☆─────────────────────────────────────☆
miroku (Neil) 于 (Mon Nov 1 10:07:48 2010, 美东) 提到:
发信人: miroku (Neil), 信区: PDA
标 题: Android操作系统第三季在美市场份额达44%
发信站: BBS 未名空间站 (Mon Nov 1 10:07:31 2010, 美东)
市场调研公司NPD最新发布的统计数据显示,今年第三季度,谷歌Android操作系统已成
为美国移动操作系统市场最流行的操作系统。
NPD 的统计数据显示,今年第三季度,安装Android操作系统的手机占据了美国手机销
售总量的44%,较第二季度增长了11个百分点。NPD的统计数据或许 会令苹果迷感到不
满,但Android操作系统的份额可能主要来自于RIM的损失。NPD的数据显示,RIM第三季
度市场份额下滑了6个百分点,市场占有 率滑落至22%;苹果iOS操作系统增长了1个百
分点,市场份额上升至23%。
对苹果和RIM而言,安慰奖是两家公司的手机分别占据了最流行手机的前两位。NPD表示
... 阅读全帖
w********1
发帖数: 3492
22
Thu, 07 Jun 2012 09:50:12 PDT
Flurry Analytics today released a new report highlighting developer interest
in iOS and Android as measured by downloads of Flurry's tools for
integrating analytics into apps. With a new high of over 18,000 SDK
downloads by developers during the first quarter of 2012, Flurry found that
iOS continues to hold a substantial lead over Android with 69% of those
downloads being for iOS.
For every 10 apps that developers build, roughly 7 are for iOS. While
Google made so... 阅读全帖
w********2
发帖数: 16371
23
个人看法,jellybean的速度提升已经改善了最基本的用户体验到苹果的level。而花头
巾方面android挺多。
之前ios的优势:用户体验,app数量,fragmentation,icloud等和tablet的紧密结合。
现在ios6发布之前,只有fragmentation是比较拿的出手了。现在苹果似乎在处理很多
ios和osx的结合中,后面用户体验的提高会表现在哪里呢?
v******g
发帖数: 1651
24
fragmentation的一个很重要的问题是尺寸吧,这是apple为啥不想改屏幕大小的原因
但是被逼着搞ipadmini,大屏幕的iphone,app自然也要为不同的屏幕做优化。。
fragmentation的问题也就出来了

合。
z***y
发帖数: 7151
25
来自主题: Database版 - sql server 面试题 (4)
多谢回复!
第一个问题没有什么标准答案,主要看interviewee的思路。
a.c. 是不错的方法。
b. 有待商榷,为什么要shrink 呢?在production environment, shrink不是一个很好
的主意。
第二,三个问题,
dbcc showcontig with fast
~~~~~
这是重点。
在结果中,主要看他的log read switch 和 extend switch 和 fragment
log read switch 发生在读页过程中, extend switch 发生在读extend (八张 页)
过程中。
fragment 越高,碎片越多。
一般来说,碎片高于30%,利用reorganize 是没有用的,只有rebuild。

can
(use perfmon)
c*****d
发帖数: 6045
26
很简单
原来的表里有fragment,数据导出然后导入到另外一个数据库
消除了fragment
k*******r
发帖数: 90
27
来自主题: EmergingNetworking版 - 有兴趣搞一个userspace的nat实现吗
mellanox 这个 pdf 对于 RDMA 编程有简单的介绍
http://www.mellanox.com/related-docs/prod_software/RDMA_Aware_P
这封邮件介绍了如何使用 IBV_QPT_RAW_ETH 来直接访问 L2
http://listarc.com/showthread.php?157108-Libibverbs:%2520add%25
Adding a IBV_QPT_RAW_ETH enables a L2 traffic kernel bypass using user-space
verbs API.
The L2 RAW_ETH acceleration assumes that user application transmits and
receives a whole L2 frame including MAC/IP/UDP/TCP headers. Depending on
frame content and available HW filters in HW any L2 traffic type coul... 阅读全帖
i****x
发帖数: 17565
28
来自主题: Hardware版 - 5Ghz是不是比2。4ghz的辐射更强?
你那个国内烂校学报的”科研“结论跟以下所有结论矛盾的时候,你说我们该信谁呢?
In 2006 a large Danish group's study about the connection between mobile
phone use and cancer incidence was published. It followed over 420,000
Danish citizens for 20 years and showed no increased risk of cancer.[21] A
2011 follow-up confirmed these findings.[22]
The following studies of long time exposure have been published:
The 13 nation INTERPHONE project – the largest study of its kind ever
undertaken – was published in 2011 and did not find a solid li... 阅读全帖
s*****n
发帖数: 513
29
来自主题: Hardware版 - POGOPLUG安装squeeze出错
U盘已经格式化成以下两个分区:
Disk /dev/sda: 4004 MB, 4004511744 bytes
246 heads, 16 sectors/track, 1987 cylinders
Units = cylinders of 3936 * 512 = 2015232 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 509 1001704 83 Linux
/dev/sda2 510 1987 2908704 82 Linux swap
然后按照http://projects.doozan.com/debian/的步骤安装debian,
报错说:
# Starting debootstrap installation
E: unrecognized or invalid option --no-check-gpg
debootstrap failed.
See ... 阅读全帖
m******t
发帖数: 2416
30
来自主题: Java版 - JSP translation unit?

I would think so. The criteria is pretty clear - whatever gets compiled into
one servlet is one unit. So any single jsp, as long as it's not included by
another (i.e. not a jsp fragment), it's a translation unit.
Dynamic includes get "included" at request-time, so they don't have to do
with translation at all.
Still one, I would think. A spec compliant jsp compiler would include the
fragment verbatim, and then do the compilation.
wy
发帖数: 14511
31
"Modern Linux filesystem(s) keep fragmentation at a minimum by
keeping all blocks in a file close together, even if they can't be
stored in consecutive sectors. Some filesystems, like ext3, effectively
allocate the free block that is nearest to other blocks in a file.
Therefore it is not necessary to worry about fragmentation in a
Linux system."
x
n******r
发帖数: 718
32
回答becarexinxin的问题
怎样才能保证wubi的寿命啊?
保证不敢讲。心得有一条。
wubi因为是在Windows里面安装的,从Windows看进去ubuntu是一个几G的file。这个
file如果在硬盘上是没有fragmentation的话,就会快一点,以后也不容易坏。可是
wubi安装的时候如果硬盘上没有几十G的free space,愚蠢的微软就经常会把这个
ubuntu file搞成fragmented。
解决办法:在Windows里做defragmentation。最好单独划一个盘给ubuntu用。
defragmentation之后重装ubuntu,ubuntu用的部分在硬盘上就是连续的一块了。
还有一点要指出。就是装好ubuntu之后如果再做defragmentation,Windows只要挪了
ubuntu file的位置,GRUB就找不到ubuntu了。
s*****n
发帖数: 513
33
来自主题: Linux版 - POGOPLUG安装squeeze出错 (转载)
【 以下文字转载自 Hardware 讨论区 】
发信人: slinson (slinson), 信区: Hardware
标 题: POGOPLUG安装squeeze出错
发信站: BBS 未名空间站 (Tue Jul 28 08:39:56 2015, 美东)
U盘已经格式化成以下两个分区:
Disk /dev/sda: 4004 MB, 4004511744 bytes
246 heads, 16 sectors/track, 1987 cylinders
Units = cylinders of 3936 * 512 = 2015232 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 509 1001704 83 Linux
/dev/sda2 510 1987 2908704 82 Linux swap
然后按照http://projects.doozan.com/... 阅读全帖
O*******d
发帖数: 20343
34
The following graph shows the pipeline of image rendering in OpenGL.
Stencil buffer is used at Per-fragment operations which is the last step in
the pipeline. When data reached Per-fragment operation, coordinate has been
resolve to screen pixels.
http://www.cs.kent.edu/~farrell/graphics/opengl/openglprog1.2/opengl/render.html
s********k
发帖数: 6180
35
来自主题: Programming版 - 怎样高效管理内存?
这太难了,我看前面建议的byte memory是不是就是任意大小,可能会需要
fragmentation以及defrag,然后block memory就是固定的block,更快,没有
fragmentation以及defrag,但是会有浪费(比如需要的内存只占用block的一半)。前
段时间记得版上讨论有说俄罗斯人写了个很高效的malloc类似函数?有人能讲解下高效
在哪里呢?谢谢
c******o
发帖数: 1277
36
first we need to ask why we have heap and stack, obviously you can implement
one using the other.
they just different, and stack is faster mostly if you are ok with its cons
copy from else where:
Stack
very fast access
don't have to explicitly de-allocate variables
space is managed efficiently by CPU, memory will not become fragmented
local variables only
limit on stack size (OS-dependent)
variables cannot be resized
Heap
variables can be accessed globally
no limit on memory size
(relatively) sl... 阅读全帖
k**********g
发帖数: 989
37
来自主题: Programming版 - 请教关于C++内存管理

刚才回覆前没看清楚原文,现在深想一层,
64-bit process是不容易出现virtual address space fragmentation的。
在CPU MMU (Paging system)的作用下,物理地址的fragmentation从来不是问题
(就好像把香肠的碎渣收集起来,又灌注一条新香肠一样)。
你遇见的问题,有三个可能性∶
(1)内存泄漏,有一些应该要释放的内存,实际上因为某种原因没有被释放。
(2)C++ 的建构或赋值重载代码,或调用的代码,或类库介面设计有缺陷,导致临时
对象产生,因此出现了短暂的内存泄漏或冗馀占用。
(3)标准库内的缺陷或不足,导致临时对象产生,或短暂的冗馀占用。
以上所有可能性都可以透过 debugger step execution 排解。
S*A
发帖数: 7142
38
来自主题: Programming版 - 请教关于C++内存管理

谁说的。64 位和 32 位都一样回出现 fragment。64位就是地址大些。
但是paging 都是 4K 的(有2M paging 但是那个fragment 更大)。
前面有人指出了,这个内存是因为 lib 内部自己扩容数组的时候没有
完全用满。这样内存使用率就不高。如果加上不断 free object。
必然出现 4K 页内部不能完全用满的情况。但是你也不能压缩。
因为这个涉及所有使用的指针都要跟着变。有 GC 就好很多。
C 没有 GC 就没法灌个新香肠。
k******e
发帖数: 19
39
来自主题: Programming版 - Android memory leak
非大牛,做安卓多年时常遇到这个烂问题,MEMORY LEAK其实大多是MEMORY NOT
RELEASE SOON ENOUGH,就是留了太多暂时没用的东西在MEMORY里,比如说你用VIEW
PAGER,用FragmentPagerAdapter的话所有的Fragment都不释放,要是用
FragmentStatePagerAdapter那就可以用setOffscreenPageLimit选留几个Fragment。还
有一个常LEAK的就是IMAGE,要是不小心就放一堆BITMAP不RELEASE,立马死菜,最好就
是老实用现成的轮子,比如说PICASSO。出问题就老实地用工具查吧,总能找到症结的。
s*****t
发帖数: 1994
40
Comet Schwassmann-Wachmann 3 Passes the Earth
Credit & Copyright: Thad V'Soske (Cosmotions.com)
Explanation: Rarely does a comet pass this close to Earth. Last week,
dedicated astrofilmographers were able to take advantage of the close approach
of crumbling 73P / Comet Schwassmann-Wachmann 3 to make time-lapse movies of
the fast-moving comet. Large comet fragments passed about 25 times the Moon's
distance from the Earth. The above time lapse movie of Fragment B of Comet
Schwassmann-Wachmann 3 ov
n*******e
发帖数: 27
41
来自主题: Biology版 - Re: 大侠们, 请教一个问题.
they are basically the same. the principle of run-on is that you first
isolate the nuclei and remove most of the proteins, but still keep the
RNA polymerase associated with nascent transcribed target gene. then
when you add NTP and p32 labeled UTP, the TXN will run on and then all
the product will be labeled. it allows mapping of the start point from
the size fractionated products.
run-off means that TXN occurs to in vitro DNA fragments, which are
typically restricted fragments with the start si
l*****k
发帖数: 587
42
来自主题: Biology版 - another clone trick: 3-way ligation
Well, I am sure I am not the first to do this, but I do want to share it
Sometimes, cloning multiple things into a vector can be tedious as you
have to transfer the fragments through several vector to get the
desired one, usually because the existence of the same Restriction site
in the vector and the fragment you want to clone.
say a gene has 2 frags in two separate vector, now you wanna get
them ligated into the same vector.
EcoRI------------XhoI Frag I (has interal BamHI site)
XhoI-
d********r
发帖数: 303
43
来自主题: Biology版 - SBIG: Channels
First I would start by posting a figure on this board.
what is the blue molecule?
and what is the yellow one?
Answer:
Membrane protein is very difficult to crystallize. Therefore, Mackinnon spent
lots of time to get monoclonical antibody against KcsA potassium channel. The
blue molecule is the the Fab fragment and the yellow molecule is the channel.
The amazing thing is only the fab fragment interact each other and mediate the
crystallization. Therefore, the hydrophobic residues on the channel d
m*******h
发帖数: 896
44
来自主题: Biology版 - Re: Yeast Enolase_2 Help
If you want to try top-down. You need definitely two things:
1) A proper fragment method for break down large molecule. low energy
CID can handle some small proteins, but I think Enolase is too big
for low energy CID. High energy CID, ECD may help. But the fragmentation
mechanism are quite different from low engergy CID.
2) you need a high accuracy in mass determination. some time, 100ppm
error will give you so many possible matches.
It is not necessary that the weakest bond be broken first
f*********e
发帖数: 43
45
来自主题: Biology版 - 我是不是吃饱了撑的?
Don't lose your heart. If you can't do it try another way. Here is my
suggestion.
You have two fragments. If you have friends do cloning. Ask them what is
fusion PCR? design primers
with overlapping 21 nt, you can do three fragments, take one more that is in
the vector, e.g. lac region
has many restriction sites you can use!!!! do first round PCR separately,
then take a little bit each as
tamplate, use the first primer and last primer with familiar enzymes!!! such
as BamHI, EcorI, SmaI etc.
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