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1)1.0MKPO4pH6.5:Makebymixing33mlsof1MK2HPO4with
67 mls of 1M KH2PO4
2)0.1M KPO4 pH 6.5
3) 0.1M KPO4 pH 7.5: Make 500 mls by mixing 41.7 mls of 1M
K2HPO4 and 8.3 mls of 1M KH2PO4 with 450 mls of ddH2O
4) 37% Formaldehyde
5) KS Buffer: 0.1 M KPO4 pH 7.5/1.2 M Sorbitol
6) Zymolyase 100T:5 mg/ml solution in 0.1M KPO4/0.5% β-
mercaptoethanol
7) β-mercaptoethanol
8) HS Buffer: 0.1 M Hepes pH 7.4/1.0 M Sorbitol
9) HS/SDS Buffer: 0.1 M Hepes pH 7.4/1.0 M Sorbitol/0.5% SDS
10) 0.1 % Polylysine (MW >300,000; Sigma Cat. No. P-1524) Stored
in 1ml or 10 ml aliquots at -20°C.After thawing microfuge
aliquot for 5 min. at 4°C before adding to slides.
11) Multiwell teflon masked slides (Carlson Scientific Inc. Peotone
IL. Cat. No.100806)
12) PBT Buffer: PBS with1 mg/ml BSA and 0.02% Tween 20
13) PrimaryAntibodies: Affinity purified polyclonal antibodies or
monoclonal antibodies from cell culture supernatant (notfrom
ascites fluid). Dilutions must be determined emperically for each
primary but common ranges are for affinity purified sera 1:10
to 1:100 in PBT Buffer. For cell culture supernatants 1:1 to 1:5
dilutions are normally used (if cell supernatants were
concentrated by ammonium sulfate precipitation then 1:10 to1:50
dilutions are often used). After diluting in PBT buffer spin
secondary in microfuge (at 4°C) for 5 min to pellet any debris.
14) SecondaryAntibodies: Jackson Immunoresearch Laboratories
makes high quality secondary antibodies which are good for
both single and double labeling experiments. We've been using:
Texas Red conjugated AffiniPure Donkey Anti-Mouse IgG
(Cat#715-075-141) and Fluorescein (DTAF) conjugated
AffiniPure Donkey Anti-Rabbit IgG (Cat#711-015-132). They
are sent as freeze-dried powder which should be reconstituted
with ddH2O according to directions and then aliquoted into 50
µl/tube (marked with name of Ab and Date) and frozen on dry
ice and stored in the "Secondary Antibodies" Box in the -80°C
Freezer. After thawing an aliquot keep it at 4°C--it should be
good for about a month. These secondary Abs work very well
for both double and single labeling and should be used at 1:50
to 1:100 dilutions each (in PBT buffer). After diluting in PBT
the solution should be microfuged for 5 min at 4°C to remove
any precipitates that may have formed.
15) Mounting Medium:Dissolve 10 mg of ρ-phenylenediamine
(Sigma Cat. No. P-6001) in 1 ml of 1M K2HP04 in a 1.5 ml
eppendorf tube. Vortex vigorously for several minutes, cover
with foil, and rock on nutator for 20-30 minutes. Vortex again
and microfuge for 5 min. Remove the top 800 µl to a 15 ml
tube. Add 7.2 ml of glycerol and mix by vortexing. Divide into
500 µl aliquots and store at -80°C (in the "Secondary Ab" Box).
Optional: For nuclear staining DAPI can be added to mounting
medium as follows:make a 1 mg/ml DAPI (4',6-diamidino-2-
phenylindole dihydrochloride) solution in water, dilute it 1:100
with water and add 2.25 µl to 1 ml of mounting media.
Method:
1)For each strain to be examined inoculate 50 mls of YPD or SD
(with the appropriate amino acid supplements). Grow overnight at
25°C until culture is at a OD599 between 0.5 and 0.8.For examing
unshifted cells proceed directly to Step 2.For examining sec7ts and
sec6ts strains spin cells out of YPD at OD599 of 0.5-0.6 and resuspend
in the same volume of YP with 0.2% Glucose and then incubate in a
37°C shaking water bath for 2 hrs. Check OD599 and then cool for 5
min on ice until the culture is at room temperature before fixing.
2 ) Fix yeast directly in the culture by adding to each 50 mls of
culture: 5 mls of 1.0 M KPO4 pH 6.5 and 6 mls of 37% Formaldehyde
directly to the culture flask. Incubate at room temperature with
gentle shaking for 30 min. Transfer an amount of cells that is equal
to about 5-10 OD599 units for each culture into a 50 ml centrifuge
tube and spin in the Beckman table-top centrifuge for 5 min. at 2000
RPM at 25°C.Aspirate off the supernatant and resuspend e