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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Survival analysis is a statistical method used to analyze time-to-event data, often employed in fields such as medicine, engineering, and social sciences. One of the key challenges in survival analysis is dealing with incomplete data, a phenomenon known as "censoring." Censoring occurs when the event of interest (such as death, relapse, or system failure) has not occurred for some individuals by the end of the study period or is otherwise unobservable, and it might have many different...
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    Climate change poses a risk of releasing ancient pathogens from Arctic permafrost. This thawing permafrost could expose dormant viruses and bacteria, posing a global health threat.

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    Area of Science:

    • Environmental science
    • Microbiology
    • Public health

    Background:

    • Arctic permafrost contains a reservoir of ancient microorganisms, including viruses and bacteria, frozen for millennia.
    • Rising global temperatures due to climate change are accelerating permafrost thaw.
    • The release of these ancient pathogens presents an unprecedented risk to global health.

    Discussion:

    • The thawing of permafrost due to climate change could lead to the re-emergence of dormant pathogens.
    • Assessing the viability and infectivity of ancient microbes is crucial for understanding potential risks.
    • The potential for zoonotic spillover events from released pathogens requires careful consideration.

    Key Insights:

    • Climate change is a direct driver for permafrost thaw, increasing the likelihood of pathogen release.
    • Ancient pathogens, once thawed, may pose novel threats to both animal and human populations.
    • The long-term ecological and epidemiological consequences of permafrost thaw are not yet fully understood.

    Outlook:

    • Further research is needed to characterize the microbial content of permafrost and assess pathogen risks.
    • Developing effective monitoring and surveillance strategies for released pathogens is essential.
    • International cooperation is vital for managing the global health implications of thawing permafrost.