由买买提看人间百态

topics

全部话题 - 话题: glycerol
1 2 3 4 下页 末页 (共4页)
H*g
发帖数: 2333
1
Sorry only could type in English using lab computers
I a trying to express protein in E.coli and am wondering if I should save
glycerol stocks for transformed
BL21(DE3) or Rosetta2(DE3) strains for future or should we always start from
a new transformant?
How often does mutation occur in these strains?
Thanks a lot!
n***w
发帖数: 2405
2
I do glycerol stocks and expressed my protein for couples of times and at
this point, no mutations found. And honestly I do not know the answer...
T**********t
发帖数: 1604
3
Of course make glycerol stocks for those strains.
It's usually recommended to renew those stocks every 6 months. But I've used
frozen stocks of several years old and still got satisfactory expression. I
guess it may vary from case to case, though.
I would do small scale expression test each time before a large scale
expression culture if I'm worried about the quality of the frozen stock.
Just use a 5-ml culture and induce as how you would with a 1-L or larger
culture (scale down the amount of IP... 阅读全帖
jh
发帖数: 23
4
实验室-80C坏了,正在维修,请问能否把E. coli glycerol stock移到-20度暂时放1,
2天?
谢谢!
c*********r
发帖数: 1312
5
来自主题: Biology版 - 蓝色小蝙蝠发包子
多谢啦!Protocol奉上。
我们是用小鼠胚胎的软骨和骨头染色的protocol。染软骨的话只用Alcian Blue即可。
最后胚胎用BABB处理就会变得透明。BABB危险,而且会腐蚀显微镜,使用时要小心。很
多动物的胚胎都可以用类似的方法染骨头(红色)和软骨(蓝色):鼠,龟,蛇,鸡,
鱼,蜥蜴,变色龙,蝙蝠。。。而且都很漂亮!
比如这个人,做了好多不同动物的染色还到处办展览:
http://www.shinsekai-th.com/en/photo.php
Protocol:
1. Skeletal Preparations- Cartilage and Bone staining
1.1 Cartilage staining in mouse embryos from E12.5 - E13.5
Dissect out embryos, rinse in 1 x PBS, and place in ice-cold 95% Ethanol for
1 hour.
Change to fresh 95% ETOH and rock overnight at room temper... 阅读全帖
d**********7
发帖数: 42
6
来自主题: Chemistry版 - paper help!!
By Chen, Jung-Shou; Barton, Peter G.
Dialkyl ether phospholipids. I. Chemical synthesis of some model compounds
Bioorganic Medicinal Chemistry Letters 2005, 15, 5494
From Canadian Journal of Biochemistry (1970), 48(5), 585-93. Language:
English, Database: CAPLUS
The syntheses of 3 1, 2- dialkyl- sn- glycerol 3- phosphates and 1 new 1, 2-
dialkyl- sn- glycerol are described. 1, 2- Dioctadecyl- sn- glycerol 3-
phosphate was obtained by phosphorylation of 1, 2- dioctadecyl- sn- glycerol
with di-
l**********r
发帖数: 240
7
It is the major constituent of fat and oil, formed by esterification of
glycerol, a condensation reaction between the hydroxyl group of glycerol
molecule and the carboxyl group of a fatty acid molecule(脂肪酸). When all
three hydroxyl groups of a glycerol molecule are esterified, it becomes a
triglyceride.
在我们体内,它是脂肪的主成份。通常意义上讲的饱和或不饱和脂肪,指的是脂肪酸的饱
和程度,把甘油部份给忽略了。

like
amounts.
n**m
发帖数: 7872
8
碳水化合物(carbohydrate)是多糖,分解了就成了单糖,(其中最常见的就是葡萄糖
了),所以
碳水化合物吃完了会升血糖。
脂肪是三油酸脂,由三个脂肪酸(fatty acid)和一个glycerol backbone组成。吃了
的脂肪会
在体内分解成脂肪酸和glycerol
蛋白质分解以后是氨基酸。
糖可以合成glycerol,所以有糖有fatty acid的情况下比较容易合成脂肪。
只要有carb摄入,就会有血糖上升。但是这个不能得出你那个结论。正常范围内的血糖
变化是人的正
常生理现象。急速的,超量的血糖变化则会给胰岛带来负担(比如大量简单carb,或者
含糖饮料)

呢?
l********b
发帖数: 6
9
来自主题: Biology版 - Re: GST-Fusion 蛋白提纯求助!!!
He meaned you don't have to add glycerol at all if you find it does not hurt
the protein property. If you know it is an enzyme, I think you had better add
glycerol, because freezing and thawing cycle can kill the enzyme. For other
proteins, I do not bother to add glycerol either.
And to get rid of gluathione, besides dialysis, there is an easy way. Take a
spin-column with an appropriate cut-off filter, e.g. 30KD, spin, concentrate
the protein and get rid of the solvent in the meanwhile. Then add
r****o
发帖数: 105
10
本文献给YL
(五)"万金油"buffer
Dr. Burgess 这人特有意思,喜欢吹嘘他发现的小trick。比如,他得意说他是全美国最早用
coomassie blue染蛋白胶的人。据他说,六几年的时候他看到一个澳洲的老兄的一片文章,讲述
一种新奇的染料叫考马市亮蓝, 比当时流行的染料amido black灵敏十倍以上。所以他就写了一
封信要了一些,结果效果奇好。我们听得都目瞪口呆。
不过Burgess最自豪的,还是他的“万金油”buffer。他告诉我们说,他几十年了,总喜欢用这
个buffer的配方,什么蛋白都喜欢这种buffer, 可以说到了包治百病的神奇地步。尽管他吹得神
乎其神,配方却十分简单。这个buffer叫TGE,就是Tris, glycerol 和 EDTA。配方是这样的:

50mM Tris pH 7.9
0.5mM EDTA
50mM NaCl
5% glycerol
Tris EDTA NaCl 这三样都没什么,真正关键的是5%glycerol。有了这个glycero
n**m
发帖数: 7872
11
糖可以转化成glycerol,有糖有fatty acid的情况下比较容易合成脂肪(一个glycerol
+3个
fatty acid)。
肌肉,从生化上来讲,就是蛋白质,由氨基酸合成。
还有一个,如果摄入的carb很少,身体要保持稳定的血糖,就要分解蛋白质产生氨基酸
,然后合成葡萄
糖。身体基本不能从脂肪生成糖(脂肪可以生成酮体,提供能量,但是不能生成糖)。
一个tip,low carb的时候,要保证蛋白质的摄入。如果身体不能从你的食物中得到足
够的蛋白质转化
成糖,就该分解肌肉里的蛋白质了。
T****r
发帖数: 4006
12
来自主题: loseweight版 - 说说精细碳水
图看的很仔细,可惜这图画的不全面,你把里面的文字仔细读读,脂肪是一个glycerol
带着3个free fatty acids, 脂肪分解后,那个glycerol可以用来做为gluconeogensis
的原料,而fatty acids会分解形成ketone bodies.
c**a
发帖数: 94
13
his tagged 的蛋白用nickel resin纯化出来,在elution buffer里, buffer里有
imidazole, sodium
phosphate. 一共1ml. 以后需要做activity asssy, 请问怎么保存才能不失活性?
是不是要加protease inhibitors, glycerol? 加多少glycerol? 冻-20还是-80?
a****k
发帖数: 1130
14
偶来补充自己的看法吧:透析不是必须的,只要imidazole不影响activity就好。一般
不用再加protease inhibitor,因为细胞裂解的时候不是已经加过了吗。不建议加EDTA
,不知道lz是要做什么activity assay,很有可能这个蛋白本身自己就是需要镁离子的。
glycerol,对于一般的蛋白我们都是加10%,然后分装后用液氮冻完存在-80度。但是
碰到很不好保存的蛋白,比如冻了一两个月就没有activity的,把glycerol加到20%会
有帮助。

DTT或者beta mecapitalmethanol,保持溶液的还原状态,视情况而定。
存也会失活,那就需要找到合适的buffer,或者每次都用fresh made的蛋白
r*******i
发帖数: 112
15
glycerol 是蛋白稳定剂(因蛋白而异)并能保护蛋白在急冻时候少受破坏 >=5%才有用
imidazole 是弱的denaturant, 很多蛋白不喜欢
EDTA 是金属chelator, 如果你的蛋白里没有金属,应该没有伤害,但也没什么用,因为在
提纯中用EDTA 可以抑制金属蛋白酶
很多时候100mM KCl (or NaCl, (NH4)2SO4)with/without 50 mM Arg 增加可溶性和稳
定性, 原理很有争议, 也有用 Arg + Asp
最后, 浓缩,离心,分装,急冻 (N2 liquid), -80
or 50%glycerol -20
x**y
发帖数: 46
16
跟我最近的EMSA相似,给你一些有用的意见:
1. 如果你的蛋白有aggregation,加一些Triton100(0.1,0.5or1%). 听很多人说,这
很有用。
2. 用4-12% TBE gel (Invitrogen)。如果自己配,用4%。或者3%,下层加三分之一
15%防止free probe run out。
3. 如果还不行,用垂直配胶系统(Bio-rad配PAGE gel用的, 1.5mM)配Agrose胶(1%
? 2%?记不清了)。里面可以加Triton & glycerol。
我的蛋白80kD, oligomerization 后500 or 1000kD (FPLC测定)。6%TBE gel完全在
well上,4-12%能进一点点,3%可完全进入但很难看。最近我们lab新来的Postdoc用了
Agrose胶,效果不错。我让他加了一些Triton & glycerol,效果更好了,binding
affinity 都增加了几倍。但具体浓度,我得问问他。
s******s
发帖数: 699
17
来自主题: Biology版 - 蛋白表达求助
要表达GST融合蛋白,第一次转进BL21 codon+(找别人借的...)中,挑菌,摇过夜,
存了一份glycerol stock放在-80, 然后剩下的菌IPTG诱导,成功表达。
可是后来用glycerol stock, 同样的条件,却再也不能诱导表达了,我也从冻在四度的
板子上再挑过菌,还是不能表达。
现在的打算是再找别人借一次(主要是有六个蛋白要表达一老借也不是个事),但还是
觉得很奇怪,菌的抗性还保存着说明质粒应该还在啊,当然这个菌不是保存质粒的好选
择,会有重组,可我还是不敢相信六个样品都发生重组。
有人知道这种第一次可以表达第二次就不行的现象是为什么吗?先谢谢大家了。
下面是抱怨帖:博士后天天在后面追着要蛋白,可是我还有ACE马上要过以及自己的课
题还有别的一堆事,真的没有那么多时间来trouble shooting啊>_<
d****i
发帖数: 2346
18

我用的是这个:
Stock Final 10mL 50mL
SDS 8% 0.8g 4g
Tris (pH6.8) 0.5M 0.2M 4mL 20mL
EDTA 0.5M 4mM 80uL 400uL
Glycerol 100% 50% 5mL 25mL
Bromophenol Blue 4% 0.4% 1mL 5mL
glycerol也是50%啊。是不是加点sucrose会更好。
另外,你这个还有Na2HPO4,第一次见到。
b******n
发帖数: 4225
19
来自主题: Biology版 - 怎么能带好新人?
呵呵,老美新人你一定要小心
尤其是涉及配溶液需要计算的活
比如500ml 10%的glycerol,他们能给你配成500ml H2O + 50ml glycerol
那种1mM,20mM之类的东西绝对不能靠他们算
d*****i
发帖数: 3905
20
来自主题: Biology版 - Yeast问题求教
最近开始做yeast,有些问题请教大家
研究一个KO strain,发现SC 2% glycerol media里三天都不长,感觉是respiration
deficiency,但是在SC 2%glycerol plate上drop assay,居然长得和WT一样。。。
然后尝试用p416 gpd promoter的vector rescue,却完全rescue不了这个phenotype。
。。
Any idea? THX!
a*****s
发帖数: 131
21
来自主题: Biology版 - shRNA购买疑问
买bacterial glycerol stock只要$75一个!
请问买了bacterial glycerol stock之后,可以提无数次plasmid吧?
q****e
发帖数: 3660
22
来自主题: Chemistry版 - paper help, thanks!
1. Esterification Kinetics of Glycerol with Fatty Acids in the Presence of
Zinc Carboxylates: Preparation of Modified Acylglycerol EmulsifiersAdam
Macierzanka and Halina Szelg
Industrial & Engineering Chemistry Research2004 43 (24), 7744-7753
2.Selective Esterification of Glycerine to 1-Glycerol Monooleate. 1. Kinetic
Modeling
Facultad de Ciencias Químicas, Departamento de Ingeniería Química,
Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid,
Spain
Ind. Eng. Chem. Res.,
r**********0
发帖数: 746
23
来自主题: Nursing版 - Med question
你说的是不是
开塞露
Glycerol Enema
〖中文通用名〗开塞露(含甘油)
〖英文通用名〗Glycerol Enema
〖所属类别〗消化系统药物/泻药/滑润性泻药
O*******d
发帖数: 20343
24
Proteins, carbohydrates, and fats are the principal structural components of
living cells. Lipids are a class of food chemicals that include fats and
oils. They are the most concentrated source of food energy providing nine
calories of energy per gram. In our bodies, lipids carry the fat-soluble
vitamins, contribute to food flavor, and help us feel full after eating.
Fats and oils are available in many forms; fats are solid at room
temperature while oils are liquid at room temperature.
Accor... 阅读全帖
c******l
发帖数: 3972
25
来自主题: Military版 - 用家里的冰箱可以冷冻精液吗?
掺glycerol,用液氮冷冻到-80
t***u
发帖数: 20182
26
来自主题: ebiz版 - 老生常谈-local 蜂蜜的奇效
主要是糖的作用,用冰糖蒸梨也一样
The potential health benefits of honey have been studied in clinical trials
and other experiments according to the scientific method. Little to no
efficacy has been identified.
Allergies[edit]
Honey is ineffective for the treatment of rhinosinusitis.[81]
Burns dressing[edit]
There is some weak evidence that honey may help treat mild burns if used in
a dressing.[82]
Cancer[edit]
Honey has been promoted as being potentially of use in the treatment of
cancer.[83] However, while exp... 阅读全帖
s****7
发帖数: 1873
27
【 以下文字转载自 Medicine 讨论区 】
发信人: super7 (777), 信区: Medicine
标 题: 请问:碘甘油 这里otc 叫什么?
发信站: BBS 未名空间站 (Fri Nov 2 20:23:43 2012, 美东)
找不到Iodine Glycerol 成分的OTC,急需这个东东,谢谢!
a*****c
发帖数: 3525
28
脂肪和油的介绍以及如何选择好的食用油
如果单凭一点脂肪会让人长胖,这么个偏见,那么你可能就无法保证自己身体健康该有
的正确认识了。对脂肪或者油需要有个比较简单和清晰的了解,了解你可能不知道的有
关脂肪的知识,这是本文试图提供的信息。
花了些许功夫在网上搜索一番,找了些资料编译整理一下,其中某些地方可能存在争议
,在所难免,毕竟还没有定论的事情,只能是大体如此了。(转载请注明本文由
agostic所写)
1、脂肪对生命体的重要性
虽然从饮食中完全去除脂肪是不可能,但如果真的完全除去脂肪的话,这么做是不健康
的。脂肪对于保持健康的皮肤和头发,避免身体器官受撞击,维持身体温度和促进健康
细胞功能起到关键的作用。脂肪也是作为身体的能量储备。脂肪在体内分解释放出甘油
和脂肪酸。甘油可在肝脏转化为葡萄糖而被用来作为能量的来源。
维生素A、D、E、和K是脂溶性分子,意味着他们只能与脂肪一起消化、吸收和储运。脂
肪也是人体必需脂肪酸的来源。脂肪对人体的用处许许多多,就不多叙述了。
2、简单介绍脂肪及其相关术语
脂肪(fat)在化学上是指由脂肪酸(fatty acid)和甘油(glycerol)反应组成
f*****k
发帖数: 195
29
洗过牙齿后,牙龈有点发炎。去看牙科,肯定又要我用抗生素。所以想自己买点碘甘油
s****7
发帖数: 1873
30
来自主题: Medicine版 - 请问:碘甘油 这里otc 叫什么?
找不到Iodine Glycerol 成分的OTC,急需这个东东,谢谢!
s****7
发帖数: 1873
31
来自主题: Medicine版 - 请问:碘甘油 这里otc 叫什么?
找不到Iodine Glycerol 成分的OTC,急需这个东东,谢谢!
s*********s
发帖数: 1303
32
来自主题: NextGeneration版 - Enfanmil Poly Vi Sol 滴管的使用和清洁
我换childlife multivita mineral了,poly-vi-sol的formulation做得太差了,用的artificial的flavor,还用glycerol作溶剂,也太cheap了
l**p
发帖数: 887
33
开塞露,Glycerol suppositories,马上见效,在卫生间里用。然后,就是等一分钟左右。
s****7
发帖数: 1873
34
Iodine Glycerol ----药店里找不到,应该是OTC吧??
s**********8
发帖数: 25265
35
来自主题: NextGeneration版 - 娃三天没拉便便了, 怎么办?
go to walgreen. there are glycerol or related product to put into his 直肠
to make him poo.. this can be used on rare cases, not for routine use
J*****i
发帖数: 2622
36
来自主题: NextGeneration版 - 娃三天没拉便便了, 怎么办?
大喊一声,宝宝版真TMD灵了!
我正在这里上窜下跳给儿医打电话,准备换衣服出去买苹果,梨,glycerol,倒腾麻油
,我家奶奶就跑来跟我说我家小祖宗拉了好大一块橡皮泥一样的巴巴。
学习了! 楼上的妈妈接包子!
r*******i
发帖数: 14
37
Eczema had bothered my daughter for about 2 and half years since she was 1.5
years old, and we had to stop all dairy products since they only aggravate
her eczema. After we went back to China early this month, and got to know
this cream, she is now totally cured. She can drink no matter how much milk
she wants, and we won't see any sign of eczema coming back!
Below is the product information. Please pass around to families who need it.
Name: Ying Bao (婴宝)
Ingredients: Glycerine, PG, glycerol mon... 阅读全帖
r*******i
发帖数: 14
38
Eczema had bothered my daughter for about 2 and half years since she was 1.5
years old, and we had to stop all dairy products since they only aggravate
her eczema. After we went back to China early this month, and got to know
this cream, she is now totally cured. She can drink no matter how much milk
she wants, and we won't see any sign of eczema coming back!
Below is the product information. Please pass around to families who need it.
Name: Ying Bao (婴宝)
Ingredients: Glycerine, PG, glycerol mon... 阅读全帖
c******r
发帖数: 3778
39
来自主题: Parenting版 - 孩子三天了没有大便怎么办
都那摸到硬块了?那就去cvs买点glycerol栓剂,塞进去,一刻钟就拉出来了。
prune juice啥的没错,但是太慢了。
p*****r
发帖数: 805
40
Elsevier的材料类杂志,IF大约在2左右。
关键词: gold and silver nanoparticles, physical deposition of metal,
propane-1,2,3-triol (glycerol), TEM, UV-Vis
有意者请站内联系,包括你的name,email(institutional or professional email
prefer),list of publications给我,如果合适我会向杂志编辑推荐,先到先得。
p*****r
发帖数: 805
41
Elsevier的材料类杂志, IF~2.3左右。
关键词:Mesoporous silica,high specific surface area,calcinations, XRF,
TGA, hydrolysis-aging,trimethylmethoxysilane,glycerol.
有意者请站内联系,先到先得,包括你的name,email/phone/fax(学校或单位的),
list of publications(包括文章的title)给我, 如果背景合适我会向杂志编辑推荐
。如果你得到了审稿机会,希望秉持专业精神按时保质保量完成。
t****a
发帖数: 439
42
来自主题: Immigration版 - 转让journal review: Biotechnology-Biofuel
Key words:
Ethanol
Elimination of glycerol production,
Redox balance
Stress management
Saccharomyces cerevisiae
Please drop me a message ONLY if you are an expert in Saccharomyces
cerevisiae metabolic engineering.
Thanks.
b****n
发帖数: 379
43
有审稿机会两篇,都是IF~1.1的杂志。一个 GLYCEROL ETHERIFICATION,一个
Holographic grating inscription.有相关经验的、有需要的,请发name,
affiliation, email至站内信。
另外,在下也需要ACS和RSC的杂志审稿机会,主要是photochemistry, solar energy,
catalysis, MOF, etc.现在审过的主要都是wiley和springer的。谢谢!
G***6
发帖数: 1323
44
来自主题: Immigration版 - 审稿转让 GONE
请一定考虑背景是否合适。
TITLE: Tuning the electrical, mechanical, and optical properties of MWCNTs-
polymer composites with plasticizer and conducting spacer at the interface
ABSTRACT: Optically transparent, electrically conductive, and mechanically
flexible acryl amide films are produced by in-situ polymerisation technique.
The addition of plasticizer enhances the flexibility of the composite film
depending on the concentration of glycerol in the slurry. The multiwall
carbon nanotubes (MWCNTs) content is ... 阅读全帖
c*********o
发帖数: 1734
45
I will recommend the first three responds with the right background to the
editor.
There is no guarantee you will be picked by the editor. If you reviewed for
this journal before, do not email me.
Send email to c*********[email protected] with the following information:
You official name
Your degree
Your official organization
Your business email address
You business title
And brief introduction of your background.
Most important: register with IJP as a reviewer with your business email
address before ... 阅读全帖
l****5
发帖数: 2968
46
来自主题: Immigration版 - paper help (4)
Effect of maltodextrin, glycerol monostearate and tricalcium phosphate on
vacuum dried mango powder properties
请发g***********[email protected]
包子酬谢拉。
d*****9
发帖数: 3459
47
来自主题: NewYork版 - 你们觉得,橄榄油和味精
smoke point by definition is the temperature at which a cooking fat or oil
begins to break down to glycerol and free fatty acids, and produce bluish
smoke.
w***s
发帖数: 7132
48
来自主题: Tennessee版 - 姑娘们的东西
英文/中文 护肤品成分对照表2006-07-28
Tag:护肤品常识
版权声明:转载时请以超链接形式标明文章原始出处和作者信息及本声明
http://drer5.blogbus.com/logs/2927288.html
你必须知道的常见护肤品成分:
水:water/aqua,purified(纯净水)
酒精:alcohol,SD Alcohol 40,Alcohol denat
香料:fragrance/parfum
色素:种类很多,一般从是否出现颜色的单词来判断,比如CL42090、blue1,Red4
保湿剂:常见的是Glycerin,Sodium```,还有很多其他种类
Hydratant/Hydra/Moisturize=保湿
Pore Minimising/Pore Reducer=收缩,细致毛孔
Lift/Firming/Contouring=紧实,提拉
Sebum/Shine/Beilliance=控制皮质分泌
Nutri/Nutritive/Nourishing=丰富营养,滋润
Repair/Anti-Age=修复,抗衰老
Exfoliant/Gommage/Scru... 阅读全帖
d*i
发帖数: 9453
49
☆─────────────────────────────────────☆
mark (花生,微爷远爷的爸爸) 于 (Mon Dec 31 09:39:50 2007) 提到:
http://en.wikipedia.org/wiki/Caffeine
The third metabolic derivative, paraxanthine, is responsible for an increase
in the lipolysis process, which releases glycerol and fatty acids into the
blood to be used as a source of fuel by the muscles.[39]
☆─────────────────────────────────────☆
FakedYige (贾一哥) 于 (Mon Dec 31 09:57:09 2007) 提到:
我一个同事特别爱喝咖啡,不过他看上去有点甲状腺机能抗进,人很瘦,特有精神,老跑厕
所.

increase
the
☆────
h****n
发帖数: 2784
50
纯carb摄入的时候会如何?饮食中完全没有蛋白质和脂肪

glycerol
1 2 3 4 下页 末页 (共4页)