Frozen Core Decontamination
Frozen Core Decontamination - Related Videos
09:06
Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Cited by 8 •
2016
The cryosphere offers access to preserved organisms that persisted under past environmental conditions. A protocol is presented to collect and decontaminate permafrost cores of soils and ice. The absence of exogenous colonies and DNA suggest that microorganisms detected represent the material, rather than contamination from drilling or processing.
06:19
Decontamination for Laboratory Biosafety
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2023
Robert M. Rioux and Zhifeng Chen, Pennsylvania State University, University Park, PA Decontamination is essential for laboratory biosafety, as the accumulation of microbial contamination in the laboratory can lead to the transmission of disease. The degree of decontamination can be classified as either disinfection or sterilization. Disinfection aims to eliminate all pathogenic microorganisms, with the exception of bacterial spores on lab surfaces or equipment. Sterilization, on the other hand,...
02:37
Frozen Mouse Brain Tissue Sectioning: A Procedure to Obtain Thin Frozen Tissue Sections from Frozen Murine Brain Tissue
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2023
In this video, we demonstrate the sectioning of a frozen mouse brain tumor tissue using a cryostat. The frozen brain tissue sections so obtained are stored at low temperatures until further analysis.
02:10
The Nucleosome Core Particle
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2020
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins. The paradox Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
03:10
Pilot In Vitro Study to Assess Cleaning Ability and Effects of Different Decontamination Methods on Implant Surfaces
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2025
The present pilot in vitro study aimed to evaluate the cleaning efficacy of three different decontamination tools and possible surface alterations following treatment, using permanent red ink to mimic the presence of oral biofilm.
FAQs
The outer layer is the portion most likely to have contacted drilling equipment, handling surfaces, or the surrounding environment. Separating it from the interior helps distinguish introduced material from material retained within the frozen core. This separation is important when analyses target microorganisms, ancient DNA, or chemical records that could otherwise be confounded by surface-associated contaminants.
Maintaining the core in a frozen state allows researchers to remove or isolate the potentially contaminated exterior without treating the sample as an ordinary thawed specimen. The preparation therefore preserves the physical context in which cells, molecules, or chemical signals were trapped. This supports more confident interpretation of measurements from the retained interior.
Sterile tools and containers reduce the chance that laboratory handling introduces new material after the original surface has been removed. Their role complements, rather than replaces, separation of the exterior layer. Together, controlled handling and physical isolation help ensure that detected biological or chemical signals are less likely to reflect preparation-related contamination.
The method creates a comparison between material associated with the potentially exposed exterior and material recovered from the interior. Signals found in the retained core can then be evaluated with greater confidence as records of the original frozen environment, while surface-associated findings may be considered in light of possible field, equipment, or handling contact.
A supported workflow begins by keeping the biological or environmental core frozen, identifying the exterior portion that may have contacted equipment or surroundings, and removing or isolating that layer with sterile tools. Researchers then place the prepared material in sterile containers for analysis. The central procedural goal is to protect the interior from recontamination throughout preparation.
The preparation requires the frozen core itself, sterile tools for removing or isolating the outer layer, and sterile containers for holding the resulting material. The sample must remain frozen during the procedure, and handling should be controlled to avoid adding contaminants after surface removal. These conditions directly support confidence in downstream measurements.
Frozen core decontamination is especially useful when researchers study ice cores for microorganisms, ancient DNA, or trapped chemical records. In each case, material introduced during drilling or handling could be mistaken for an authentic environmental signal. Preparing the interior separately improves the evidentiary basis for linking detected cells, molecules, or chemicals to the frozen environment.
A properly prepared interior provides a more defensible source for detecting cells, molecules, and trapped chemical signals. Because likely surface contaminants have been addressed before analysis, researchers can interpret positive findings with greater confidence and assess whether they represent the original frozen environment. The approach therefore strengthens data quality without treating every detected signal as automatically authentic.