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Related Concept Videos

Biodeterioration01:28

Biodeterioration

Biodeterioration refers to the unwanted alteration of materials caused by microorganisms—especially fungi—which damage both organic substrates (paper, wood, textiles) and inorganic ones (stone, plaster, glass). Unlike abiotic decay, biodeterioration results from biological activity that produces physical disruption and chemical degradation.Physical deterioration occurs as fungal hyphae penetrate pores, cracks, and surface irregularities. Hyphal turgor pressure, thigmotropic growth along...
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The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
Necrosis01:16

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Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
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Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
Carbon Skeletons01:12

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Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
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A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another.

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Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
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Factors and processes causing accelerated decomposition in human cadavers - An overview.

Chong Zhou1, Roger W Byard

  • 1Discipline of Pathology, Level 3 Medical School North Building, The University of Adelaide, Frome Road, Adelaide, SA 5005, Australia.

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Accelerated decomposition due to environmental or health factors can mislead time since death estimations. Forensic analysis must consider these factors to accurately assess postmortem intervals.

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Area of Science:

  • Forensic Science
  • Pathology
  • Toxicology

Background:

  • Postmortem interval (PMI) estimation is crucial in forensic investigations.
  • Putrefactive and autolytic changes are commonly used indicators of PMI.
  • Artefactual changes can mimic natural decomposition, complicating PMI assessment.

Observation:

  • External factors like high temperatures, humidity, fires, and vehicle interiors accelerate decomposition.
  • Internal factors such as fever, infections, drug use, obesity, and diabetes also enhance decomposition.
  • Inadequate refrigeration significantly contributes to early decomposition.

Findings:

  • Environmental and physiological factors can artificially enhance decomposition.
  • These factors can lead to misinterpretation of the postmortem interval.
  • Witness statements regarding time of death may be challenged by accelerated decomposition.

Implications:

  • Forensic pathologists must identify and account for factors causing accelerated decomposition.
  • Over-reliance on decomposition markers without considering influencing factors can lead to inaccurate PMI.
  • Accurate PMI determination requires a comprehensive evaluation of all contributing factors.