concept

CO2

Facts (15)

Sources

The Ecology of Photosynthetic Pathways | Learn Science at Scitable nature.com Nature 6 facts

claimPhotorespiration is a process where the product 2-phosphoglycolate (PG) from the oxygenation of RuBP is metabolized in the photorespiratory carbon oxidation cycle, resulting in the release of CO2 in the light.

claimC4 plants perform well in saline and dry habitats because C4 photosynthesis is saturated at lower CO2 concentrations and allows for lower stomatal conductance for a given photosynthetic rate.

claimWater-storing cacti adapt to prolonged drought by closing their stomata, even at night, allowing them to refix CO2 lost in respiration before it diffuses out of the leaf or stem.

formulaIn the C3 photosynthetic pathway, the enzyme ribulose bisphosphate carboxylase/oxygenase (rubisco) catalyzes the reaction: RuBP + CO2 → 2PGA.

claimC4 plants require less leaf nitrogen than C3 plants because the higher affinity of the enzyme PEP carboxylase for CO2 reduces the total amount of enzyme required for photosynthesis.

claimPhotorespiration reduces net photosynthesis by 35–50% depending on environmental conditions, primarily through competition between O2 and CO2 for the active site of rubisco and the release of CO2 in the photorespiratory carbon oxidation cycle.

A critical review of industrial fiber hemp anatomy, agronomic ... bioresources.cnr.ncsu.edu BioResources 4 facts

claimHemp cultivation requires less fertilizer, which reduces CO2 and N2O emissions from fertilizer production and application, and results in less nitrate leaching into groundwater and less eutrophication in rivers and lakes.

claimTo achieve a negative carbon footprint, hemp biomass must be processed or stored in ways that prevent CO2 from re-entering the atmosphere, such as converting the biomass into biochar, which enriches soil while sequestering carbon, as noted by Adesina et al. (2020).

measurementIndustrial hemp acts as a carbon sink, absorbing up to 22 tonnes of CO2 per hectare, which is a higher rate than any other crop, as reported by Adesina et al. (2020).

claimHydrothermally carbonized hemp dust affects soil emissions of CO2 and N2O, according to a 2015 study by Dicke et al. published in BioResources.

Implications of the Western Diet for Agricultural Production, Health ... frontiersin.org Frontiers 2 facts

claimAgricultural commodity production requires significant energy, primarily from fossil fuels, resulting in CO2 and CH4 emissions.

claimRuminant production for meat consumption has increased significantly over the past 50 years, contributing to increased CO2 and CH4 emissions and land-use change.

Recent breakthroughs in the valorization of lignocellulosic biomass ... pubs.rsc.org Nilanjan Dey, Shakshi Bhardwaj, Pradip K. Maji · RSC Sustainability Jun 7, 2025 1 fact

claimThe fire-extinguishing mechanism of wood modified by Yu et al. with lignin, phytic acid, and melamine-urea-glyoxal resin involves a synergistic gas and solid phase process: the lignin generates a dense char layer acting as a physical barrier, while the gas phase involves the release of CO2 and nitrogen/phosphorus-containing gases that dilute oxygen and inhibit combustion chain reactions.

Protocol for testing global neuronal workspace and integrated ... journals.plos.org PLOS ONE 1 fact

procedureEuthanasia for mice is performed by infusion of ketamine (300 mg/kg) and dexmedetomidine (3 mg/kg) or prolonged exposure to CO2, consistent with American Veterinary Medical Association (AVMA) Guidelines on Euthanasia.

Sex differences in the cardiopulmonary and neuromuscular ... biorxiv.org bioRxiv Nov 11, 2024 1 fact

measurementWhen O2 and CO2 values were expressed as a percentage of peak values from an incremental exercise test, there were no main effects of sex (p ≥ 0.631) or sex × time interaction effects (p ≥ 0.781) observed during an interval exercise task.