Permafrost thawing may lead to the release of carbon and nitrogen in high-latitude regions Northern Hemisphere, mainly form greenhouse gases. Our research aims reveal effects permafrost on CH4 N2O emissions from peatlands Xiaoxing’an Mountains, Northeast China. During four growing seasons (2011–2014), situ were monitored peatland under no-thawing, mild-thawing, severe-thawing conditions middle ...

After freezing and thawing, Pseudomonas aeruginosa harboring a drug resistance plasmid (Hg , Strep ), became acutely sensitive to mercuric ions but not to streptomycin in the plating medium. Its sensitivity to both agents in the plating medium became more pronounced, suggesting a synergistic effect of the mercuric ions with streptomycin. This freeze-thaw-induced sensitivity was transient and ca...

BACKGROUND Fresh frozen plasma (FFP) should be thawed before transfusing to the patient. Prolonged or uncontrolled thawing can denature plasma proteins. The potential risk of contamination by wet thawing had always been a point of concern. AIMS Here, we compared and evaluated the effect of thawing on clotting factor activities by two different methods (wet and dry) and other factors such as r...

In four experiments, the effects of pre-thaw delay, method of thawing, temperature of thawing solution and pellet volume on acrosome morphology and moti l i ty of" boar spermatozoa frozen by the pellet method were examined. Holding the frozen pellets for 0, 1.5, 3 or 4.5 min in a Styrofoam container before transferring them into the thawing solution resulted in maximum post-thaw percentages of ...

Polyphenoloxidase (PPO), protease activities, melanosis and exudate loss of pre-cooked Pacific white shrimp (Litopenaeus vannamei) subjected to multiple freeze-thaw cycles (1, 3 and 5 cycles) using different thawing methods were studied. PPO and protease activities increased as freeze-thaw cycles increased (p < 0.05). Thawing using running tap water resulted in the higher increases in both PPO ...

The objective of this study was to determine the effects of thawing groups of 2, 5, 10, 15, or 20 .5-ml French straws on post-thaw spermatozoal viability. Thermostatically controlled and nonthermostatically controlled thawing baths were compared. Using a split-plot design, semen from 10 bulls was extended in egg yolk citrate, frozen, and then thawed (in the respective groups) at 36 degrees C in...

After freezing and thawing, Pseudomonas aeruginosa harboring a drug resistance plasmid (Hg2+r, Strr), became acutely sensitive to mercuric ions but not to streptomycin in the plating medium, whereas its sensitivity to both agents became more pronounced indicating a synergistic effect. This freeze-thaw-induced sensitivity was transient and capable of being repaired to a simple salts medium. Tran...

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This study analyzes the pore structure and durability of concrete according to four different ratios steelmaking slag powder (SSP). Concrete containing SSP increased formation gel capillary pores due delayed hydration, largest cumulative volume was observed when incorporation ratio 20%. In terms durability, had decreased performance compared without (NN), which changes in caused by incorporatin...

This paper reviews new developments in methods of freezing (high-pressure freezing, dehydrofreezing and applications of antifreeze protein and ice nucleation protein) and thawing (high-pressure and microwave thawing, ohmic thawing and acoustic thawing) for foods. With a good understanding of the solid–liquid phase diagram of water, the effects of pressure on food freezing– thawing cycles are hi...