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Verifying Experiments on Photosynthesis
Paper chromatography is an analytical chemistry technique for separating and identifying mixtures that are or can be coloured, especially pigments. This can also be used in secondary or primary colours in ink experiments. Most leaves are green due to chlorophyll. This substance is important in photosynthesis (the process by which plants make their food). You have probably done experiments where the different pigments present in a leaf are separated using paper chromatography. However, to make this a good EEI you need to take it further. Which is the optimum solvent (propanone, ethanol, hexane etc) and why (polar, non-polar, low viscosity, high BPt and so on)?
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When the Earth was forming, harsh conditions were probably the norm on our planet, although when those conditions eased is a matter of ongoing study and debate. About 4 billion years ago, the solar system was young and conditions were violent, with giant chunks of rock careening into planets regularly. Our own moon may have been formed by one such impact. In 2014, a team of Czech scientists conducted an experiment to replicate the pressure-cooker conditions created by an asteroid slamming into the Earth. The researchers used a high-powered laser to blast a solution of formamide — a chemical that forms from the reaction of hydrogen cyanide and water, and was likely abundant in the early days of our planet. The experiment produced adenine, guanine, cytosine and uracil: the nucleobases of RNA. The experiment suggested that, rather than impeding the development of life, the violent impacts of our early solar system might have contributed to its formation. On the other hand, some studies indicate that our planet might have cooled relatively early on, and hosted some forms of simple life. Zircon crystals from western Australia, dated at over 4 billion years old, have been found to contain oxygen isotopes suggesting that the crystals formed under cool, moist conditions. A 2015 paper by UCLA geologists focused on a Western Australia zircon crystal containing graphite. The authors argued that the carbon isotopes in that crystal constituted "probable" evidence of the occurrence of photosynthesis on Earth as long as 4.1 billion years ago. Vigorous debate about this finding, though, would be more than probable.
ERIC - Verifying Experiments on Photosynthesis., …
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Computer based experiment can make changes of students' activities from operation of instruments or data collection oriented to thinking oriented. This kind of activity change helps students take part in high level spiritual activities like presenting a problem, setting a hypothesis, experiment design for verifying the hypothesis and, ingenious interpretation of data and finding activity.(Re-quoting Friedler et al.,1990, Jongwon Park 2003)
Verification of the Rosetta theory: there are several experiments that could begin to verify this proposal: does stimulating the human pineal gland pinealocytes with light create any kind of visual response in the visual cortex? This would verify the pinealocyte connection to the visual cortex via the superior ganglion and the superchiasmatic nucleus. Secondly, does a photomultiplier sensor placed in the vicinity of the pineal gland detect any photon emissions in the pineal gland when DMT is present and do they vary for different brainwave states, particularly gamma and lambda states? Also as a test for the demodulation properties of brain sand: do calcite/magnetite/apatite crystals, similar to brain sand, immersed in a suspension DMT microcrystals create photons when excited by scalar waveforms? It should be noted that LSD crystals also exhibit piezoluminescent properties, in fact, piezoluminescence may be a phenomenon found in all entheogens. Finally, i
in both the respiration and photosynthesis experiments, ..
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Experimental methods, in vegetation house conditions, were used to verify basic assumptions and along its phenologic cycle the soybean culture [Glycine max (L.), Merril]was monitored with high resolution spectroradiometer.
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