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Semen samples were visually analyzed, frozen in liquid nitrogen either untreated or after addition of 0.33 mL SpermCryos Allround (SCA) freeze medium (ProVitro, Odense, Denmark) per 1 mL semen, and stored at −196°C until further analysis.
Each sample consisted of a cotton swab that had been rotated in the cloacae of a bird to obtain fecal material which was then inoculated into bacterial freeze medium (Luria broth; BD, Sparks, USA, phosphate buffered saline containing 0.45% Na-citrate, 0.1% MgSO4, 1% (NH4 2SO4, and 4,4% glycerol).
White colonies were picked from agar plates and grown overnight at 37°C in freeze medium.
The CPT was processed at the collection site according to the manufacturer's instructions and peripheral blood mononuclear cells (PBMCs) cryopreserved at 5 × 106 cells/ml freeze medium.
Each fecal sample, collected by swirling a cotton swab in a bird's cloaca or droppings, was submerged in a bacterial freeze medium and handled as described (5 ).
The lymphocytes were re-suspended in Cold Freeze Medium (60% RPMI 1640, 10% DMSO, 30% heat inactivated FCS) at a lymphocytes density of 6-12 × 106 cells/ml.
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Monocytes were frozen for future use by suspending 10 × 106 cells/ml in ice cold freezing medium CTS® Synth-a-Freeze® Medium (Gibco).
The collected important organs were firstly fixed in 4 % neutral buffered formalin for 24 h, then dehydrated in 30%% sucrose solution, and processed into Tissue OCT-Freeze Medium and section.
OMCS were cryopreserved by storage in freezing medium (Cell Banker 1®) at −80 °C.
In Experiment 1, l-Glutamine from 20 to 80 mM was evaluated as a supplement for a conventional freezing medium for ram spermatozoa (Tris 20% egg yolk 7% glycerol).
hTGSCs were successfully cryopreserved without any change in their mesenchymal stem cell characteristics as they were treated with boron containing freezing medium.
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