Radioactive Carbon as an Indicator of Carbon Dioxide Reduction: IV.

Second, a radioactive isotope of carbon, 14C, was used to create carbon dioxide.

Radioactive Carbon as an Indicator of Carbon Dioxide Utilization: V.

Thisenergy is then used to split a water molecule into hydrogen andoxygen; in the process, the plants gain chemical energy that is usedin a companion process that converts carbon dioxide intocarbohydrates represented by CH2O in the aboveequation.

This shows that the oxygen gas produced by photosynthesis comes from water and not carbon dioxide.


The stupid system we have of traveling long distances into work, for shopping etc. by car or other transport is what needs to be changed. We need to live locally; ie. within walking or cycling distance of work, shops, schools. We need to live in reasonable sized houses, not the monstrosities that one frequently sees. The people in Europe and USA have, for too long, consumed much too much of the world’s resources in comparison of the majority of the world, and clearly they will not put up with this inequality for much longer.

I cannot say I understood the article. Are they proposing putting porous material on exhaust pipes which would trap the carbon dioxide? It seems like that would fill up awful fast.

(1940s) used radioactive carbon dioxide

Dr David Fermin from the University of Bristol said: “Currently, there are no large-scale technologies available for capturing and processing CO2 from air. The facts are that CO2 is rather diluted in the atmosphere and its chemical reactivity is very low. By combining clever material design with heterogeneous catalysis, electrocatalysis and biocatalysis, we aim at developing an effective carbon neutral technology.”

radioactive isotope water/ carbon dioxide experiment operation.

Understanding chemical reactions and the properties of elements is essential not only to the physical sciences but also is foundational knowledge for the life sciences and the earth and space sciences. The cycling of matter and associated transfers of energy in systems, of any scale, depend on physical and chemical processes. The reactivity of hydrogen ions gives rise to many biological and geophysical phenomena. The capacity of carbon atoms to form the backbone of extended molecular structures is essential to the chemistry of life. The carbon cycle involves transfers between carbon in the atmosphere—in the form of carbon dioxide—and carbon in living matter or formerly living matter (including fossil fuels). The proportion of oxygen molecules (i.e., oxygen in the form O2) in the atmosphere also changes in this cycle.

He could inject radioactive carbon as carbon dioxide into the ..

Life on earth is sustained by photosynthetic use of sunlight energy to convert atmospheric CO2 into carbohydrates. Billions of years ago, photosynthetic cyanobacterium-like prokaryotes were engulfed by early heterotrophic eukaryotes to produce aquatic photosynthetic organisms harbouring chloroplasts with double membranes. These gave rise to vascular plants which in turn adapted to changing terrestrial environments via distinctive modes of photosynthesis.

the Calvin cycle, carbon dioxide is ..

Most terrestrial plants fix atmospheric CO2 into carbohydrates via the C3 photosynthetic pathway and its initial three-carbon fixation product (Section 2.1). Millions of years of evolution under conditions of water limitation, temperature variations and glacial CO2 concentrations have produced higher plants with significant biochemical variants for fixation of atmospheric CO2 into carbohydrate, namely C4 (initial four-carbon fixation product), CAM (crassulacean acid metabolism) and SAM (submerged aquatic macrophytes) (Section 2.2).

Carbon dioxide is necessary for photosynthesis - YouTube

Figure 2.1 Photosynthetic carbon reduction (PCR cycle, also termed the Calvin-Benson cycle) utilises ATP and NADPH produced by thylakoid electron transport to drive CO2 fixation by Rubisco (a). CO2 is incorporated into a 5-carbon sugar phosphate to produce two 3-carbon sugar phosphates which can either be exported from the chloroplast for sucrose synthesis, be recycled to make more 5-carbon acceptors, or be used to make starch. The appearance of radioactive carbon in 3-carbon sugar phosphates and then in starch and sucrose following photosynthesis in 14CO2 was evidence for the pathway of photosynthesis. (b) (Original drawing courtesy Robert Furbank).