Ancient viruses never observed by humans discovered in Tibetan glacier.
In this case, the two ice core samples from the Guliya ice cap on thewere collected in 1992 and 2015. However, at those times, there weren't any special measures taken to avoid microbial contamination during the core drilling, handling or transport.
In other words, the exterior of these ice cores was contaminated. But the insides were still pristine, the researchers wrote in the study. To access the inner part of the cores, the researchers set up shop in a cold room — the thermometer was set at 23 degrees Fahrenheit — and used a sterilized band saw to cut away 0.2 inches of ice from the outer layer. Then, the researchersto melt another 0.2 inches of ice. Finally, they washed the next 0.2 inches away with sterile water.
After all of this work , the researchers reached an uncontaminated layer that they could study. This method held up even during tests in which the researchers covered the outer layer of the ice with other bacteria and viruses. The experiment revealed 33 groups of virus genuses in the ice cores. Of these, 28 were previously unknown to science, the researchers said."The
across the two ice cores," the researchers wrote in the study,"presumably representing the very different climate conditions at the time of deposition.
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