Merck KGaA, Darmstadt, Germany Products & Reviews

essentially salt-free, lyophilized powder, ≥13 units/mg protein

for quantitative PCR, MgCI2 in buffer

≥99%

lyophilized powder, 40-300 NIH units/mg protein (biuret)

lyophilized powder, ≥2,000 NIH units/mg protein (E1%/280, 18.3)

For processing tissues, cells cultured in monolayer or cell pellets

TPCK Treated, essentially salt-free, lyophilized powder, ?10,000 BAEE units/mg protein

Proteomics Grade, BioReagent, Dimethylated

lyophilized powder, ≥1000 unit/mg solid

98-100%

Molecular Biology Reagent  

≥98% (HPLC)

Type IX-A, lyophilized powder, 1,000,000-5,000,000 units/g protein (30 min assay)

Type HP-2, aqueous solution, ≥100,000 units/mL

Type L-II, lyophilized powder, 1,000,000-3,000,000 units/g solid  

≥99% (agarose gel electrophoresis)

?2.0 units/mg protein (modified Warburg-Christian)

≥95%, bacterial

powder, BioReagent, suitable for cell culture, ≥97%

Solution stabilized, with 10,000 units penicillin and 10 mg streptomycin/mL, sterile-filtered, BioReagent, suitable for cell culture  

Recommended for use in cell culture applications at  0.5 to 1 mL per liter of medium.

protease

≥90% (HPLC)

50 mg/mL in H2O, sterile-filtered, BioReagent, suitable for cell culture

Diphtheria toxin may be used as a toxin element in the construction of immunotoxin for cell specific cytotoxicity. The translocation domain of bacterial toxins with natural endosome escape mechanism has been used in the development of efficient nonviral vectors for applications in gene therapy.