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Because of the vital role of the liquid as interface in plasma medicine, this work is focused on the elucidation of the interaction of plasmas with biologically relevant liquids. The results of this thesis are an important step in the direction of the applications to real biological liquids such as blood and wound secretion ex vivo as well as in vivo. In this thesis the following questions are investigated and answered with the special focus on the free radicals as highly reactive and, therefore, hard to detect relevant group of chemical species: What is the impact of the atmospheric-pressure argon plasma jet on biologically relevant solutions? Which species are generated due to the plasma treatment of liquids? What is an appropriate detection procedure for the qualification and quantification of the short-lived species? Does the surrounding conditions influence the formation of liquid-phase reactive species and can this influence be used to tailor a desired liquid composition? What is the influence of the plasma surroundings? What is the influence of feed gas manipulation regarding the reactive species generation? Can these impacts be used for a selected reactive species composition generation? Does the treated liquid medium affect the plasma-generated reactive species output and in what way? Which are the underlying mechanisms and origins of the plasma-caused chemical changes in the solutions? Do reactive species exist, which origin is located in the gaseous phase? What is the impact of the plasma jet radiation?
The first Therapeutic ROS and Immunity in Cancer (TRIC) meeting was organized by the excellence research center ZIK plasmatis (with its previous Frontiers in Redox Biochemistry and Medicine (FiRBaM) and Young Professionals’ Workshop in Plasma Medicine (YPWPM) workshop series in Northern Germany) and the excellence research program ONKOTHER-H (Rostock/Greifswald, Germany). The meeting showcased cutting-edge research and liberated discussions on the application of therapeutic ROS and immunology in cancer treatment, primarily focusing on gas plasma technology. The 2-day hybrid meeting took place in Greifswald and online from 15–16 July 2021, facilitating a wide range of participants totaling 66 scientists from 12 countries and 5 continents. The meeting aimed at bringing together researchers from a variety of disciplines, including chemists, biochemists, biologists, engineers, immunologists, physicists, and physicians for interdisciplinary discussions on using therapeutic ROS and medical gas plasma technology in cancer therapy with the four main sessions: “Plasma, Cancer, Immunity”, “Plasma combination therapies”, “Plasma risk assessment and patients studies”, and “Plasma mechanisms and treated liquids in cancer”. This conference report outlines the abstracts of attending scientists submitted to this meeting.