Where do you store X-gal?
Where do you store X-gal?
Storage and stability: X-GAL is shipped on dry/blue ice. On arrival store at -20 °C for optimum stability. Repeated freeze/ thaw cycles should be avoided.
What is the function of X-gal?
X-Gal is a widely used chromogenic substrate for β-galactosidase. It yields a dark blue precipitate at the site of enzymatic activity. X-Gal is useful for numerous histochemical and molecular biology applications, including detection of lacZ activity in cells and tissues.
Can you dissolve X-gal DMSO?
X-Gal is soluble in organic solvents such as DMSO and dimethyl formamide, which should be purged with an inert gas. The solubility of X-gal in these solvents is approximately 30 mg/ml. X-Gal is sparingly soluble in aqueous buffers.
What is X-gal a substitute for?
There are multiple chromogenic substrates for β-galactosidase that can substitute for X-gal, these include Salmon-gal (S-gal) (6-chloro-3-indolyl-β-D-galactopyranoside), Magenta-gal (5-bromo-6-chloro-3-indolyl-β-D-galactopyranoside) and Bluo-gal (5-bromo-3-indolyl-β-D-galactopyranoside) (Aguzzi and Theuring, 1994; …
How long does XGAL last?
X-Gal Solution is stable for 6-12 months at -20°C. However, frequent use will cause degradation of the solution over time and we recommend making new stocks every 2-3 months depending on use.
Is XGAL toxic?
Acute toxicity : Oral: Harmful if swallowed. Dermal: Harmful in contact with skin. Inhalation: Harmful if inhaled. Potential adverse human health effects and symptoms : Dust in eyes may cause mechanical irritation.
Why does XG turn blue?
The ‘X’ in X-gal is a colorless pigment when attached to the galactose sugar but turns blue when cleaved by beta galactosidase. The blue color pigment will form in the cells and blue colonies are formed on the plates.
At what temperature does kanamycin degrade?
Kanamycin activity is stable at ph 7.3 and 72 degrees C. The half-life (t1/2) at pH 7.3 and 72 degrees C ranged from 3.3 h (k = 7.26 day-1, where k [degradation constant] = 1/t1/2) for ampicillin to no detectable loss of activity for kanamycin, neomycin, and other antibiotics.
Why is XGL blue?
If β-galactosidase is produced, X-gal is hydrolyzed to form 5-bromo-4-chloro-indoxyl, which spontaneously dimerizes to produce an insoluble blue pigment called 5,5′-dibromo-4,4′-dichloro-indigo. The colonies formed by non-recombinant cells, therefore appear blue in color while the recombinant ones appear white.
What does IPTG stand for?
Isopropyl β- d-1-thiogalactopyranoside
Isopropyl β- d-1-thiogalactopyranoside (IPTG) is a molecular biology reagent. This compound is a molecular mimic of allolactose, a lactose metabolite that triggers transcription of the lac operon, and it is therefore used to induce protein expression where the gene is under the control of the lac operator.
How long does media kanamycin last?
5 days
Usually, kanamycin in solution stable at 37C for 5 days.
Where is kanamycin stored?
Shipping and Storage: Kanamycin Sulfate is shipped at room temperature. For maximum stability and long-term use, store at room temperature upon receipt. Protect from moisture. Antibiotic solutions are usually added to freshly autoclaved media (after they have cooled to about 50°C).
How big is the base of a storage vault?
The storage vault floor is constructed with one piece solid 1/2” plywood on a 1-1/8″ x 4″ frame braced on 3 anti-tip runners. The base construction allows for easy access on all 4 sides and protects the base from fork lift damage.
What kind of wood is used for storage vaults?
Our storage vaults are constructed on all 4 sides with 1-1/8″ x 4″ plywood lumber frame, and 3/8″ Fir plywood construction storage vault sides, end panels and top panels. The storage vault floor is constructed with one piece solid 1/2” plywood on a 1-1/8″ x 4″ frame braced on 3 anti-tip runners.
How are precious metals allocated in a vault?
100% ALLOCATED AND 100% SEGREGATED. Your precious metals are 100% allocated (meaning physically present at the storage location and not owned by anyone else) in a vault of your choosing and is additionally always segregated from other accounts.
Can you store 100 mm of X-gal in water?
Make a stock of 100 mM in water and store working aliquots at -20°C. X-gal can be reconstituted in DMSO, or in a 50:50 mix of DMSO and water. To do the latter, you must dissolve in DMSO first, and then add water to bring up to final volume.