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Study the ability of a glucose solution to rotate polarized light.

(Understory plants are usually very shade tolerant and able to photosynthesize at very low light intensities.

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the process of photosynthesis, the energy of light


Oxygen is evolved during photosynthesis but the conditions for maximum reaction rate are intriguing. It can be affected by many things, including: sunlight - its intensity and wavelength, temperature, CO2 and O2 availability, water (which closes stomata and restricts CO2), and any factor that influences the production of chlorophyll, enzymes, or the energy carriers ATP and NADPH, such as pH and Mg2+ availability. You could test the effect of pH and temperature. It sure won't be linear but how well your prediction (hypothesis) and results agree will be interesting. You could also try light intensity. If you don't have a "luxmeter" to measure intensity you could take advantage of the fact that as you double the distance of the light source to the plant, the intensity is quartered (but you'd have to cut out daylight). There are a lot of variables to control and complex biochemical reactions to examine.

www Press and news News Archive news Neutron diffraction sheds light on photosynthesis

But as a byproduct to the photosynthetic processes that are going on which are really important for life and plants, flowers and grass and everything it turns out it is green. So chlorophyll is green, blood is red and melanin is brown because of the nature of the way light from the sun, let’s say, is absorbed by that. So we got to be really clear about this and if we're having a mini science lesson here, let's just carry on.

Polarized light microscope - Revolvy

Vertical profiles of (a) the amount of photosynthesis versus depth in a lake and (b) light intensity versus height above ground in a forest.

Chemical constituents of the water can change the ionic composition of the dialysate thus altering the concentration gradient in the dialyzer; react with constituents of dialysate or blood changing the chemical composition of the dialysate prescription or generating unwanted precipitates. This is just to highlight how important knowing how conductivity changes when precipitation occurs.

Hydrolysis is, however, so slow that solutions of sucrose can sit for years with negligible change. In sucrose hydrolysis studies, the main way to measure the extent of the reaction is by using a 'polarimeter' which measures the amount of rotation of polarised light. Schools just don't own polarimeters but there is a simple method that involves a simple and inexpensive blood glucometer (see photo left). The test sensors are sophisticated high-tech products with integrated nanoscaled membranes and detectors. And they only cost about $17.

Leaves expand to intercept light for photosynthesis, ..

there is some indication that right-circularly polarized light increases the net photosynthesis ..



Corrugated galvanised iron is a building material composed of sheets of hot-dip galvanised mild steel, cold-rolled to produce a linear corrugated pattern in them. Galvanized metals prevent rust not only by protecting the metal from direct oxygen contact, but also by the electrochemistry of zinc. When iron rusts its oxidation state is increased as electrons are transferred away from the metal. Zinc acts as an electron donor in a slightly complex electrochemical reaction, thereby preventing the oxidation of the underlying metal.



Certain materials (sugar in this experiment) are optically active. When polarized light passes through an optically active material, its direction of polarization is rotated. The angle of rotation depends on the thickness of the material and the wavelength of the light. You could make up a solution of sugar (the disaccharide called sucrose) and hydrolyse it using dilute acid to form the monosaccharides glucose and fructose:

isomers because they can rotate the plane of polarized light.
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Senior Chemistry - Extended Experimental Investigations

But how to get samples of these gases? You may have cylinders but you could produce H2 and CO2 by reaction (or let some dry ice sublimate); let some liquid nitrogen evaporate (or remove oxygen from air). And why not propane (BBQ gas) or butane (cigarette lighter fluid)? Remember that balloon gas is not just helium - it has 3% air mixed in with it. The main point is that the law holds for ideal gases but at atmospheric pressure and room temperature they won't be that ideal. And is the deviation from ideality dependent on the molar mass of the gas, or whether it is polar or non-polar, and where on earth do you get a polar gas from (HCl is too dangerous)? What range of temperatures will you use (consider liquid nitrogen, dry ice). What value will they give you for absolute zero when the V/T graph is extrapolated? How do you draw the line of best fit (is least-squares the best, does it give you the most accurate value for absolute zero?). And what is the volume of the gas in the apparatus? And what is the best way to measure temperature (of the gas as in the diagram, or of the water surrounding it)?

Pop some cipro, and you’re done

Plants need trace amounts of iron to perform photosynthesis, but certain parts of the oceans lack it, and thus algae are scarce. Recent shipboard experiments have shown that when researchers dump iron particles into such areas, it can boost growth. The algae draw the greenhouse gas carbon dioxide from the air to help build their bodies, so fertilization on a large scale could, theoretically, reduce atmospheric CO2. Seafloor sediments show that during past ice ages, more iron-rich dust blew from chilly, barren landmasses into the oceans, apparently producing more algae in these areas and, presumably, a natural cooling effect. Some scientists believe that iron fertilization and a corresponding drop in CO2 is one reason why ice ages become icy and remain so.

Coming Collapse » Coming Collapse | Geoengineering …

Global . Geoengineering's devastating effects come in many forms including drought, deluge, , and the total contamination of the entire planet, but what impact is climate engineering having on photosynthesis and thus our ability to grow food? The most obvious and easily identified factor in regard to photosynthesis is the blocking of direct sunlight, this is the stated goal of solar radiation management (SRM).

Exposing the climate geoengineering cover-up ..

This suggests a great EEI. The hypotheses are obvious from the above, but it is the measure of light intensity that needs care. Judging brightness with your eye is difficult and not that accurate. You may have a light intensity probe available with some of the datalogger kits. If not, you could use a light dependent resistor (LDR) such as the ORP-12 for which there are calibration curves of intensity vs resistance (see below). The key think is to get absolute darkness as you don't want ambient light (room or sun) getting in.

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