DPIP is used to measure the rate of photosynthesis.

A decision has to be made about the amount of each product to use to get some sort of equivalent mass of yeast for comparison (and how this is arrived at; is there any indication of the % composition of the two products). Do the yeasts each have an optimum pH and if so what pH will be chosen for the grape juice (and why)? I know that the Lalvin BGY yeast from Burgundy, France is hopeless at pHs lower than 3.2 but other work at higher pHs. Is surface area a concern (maybe if one is a bottom fermenter, and another a top fermenting yeast). What temperature will be used (and why) if the yeasts have their own optimum temperature for growth; for example the BGY Lalvin yeast from Burgundy, France works best at 24°-28°C. Will a low sugar or high sugar juice be used - important as it may be the alcohol itself that inhibits the yeast. For example, the Lalvin CLOS yeast from Spain is high-alcohol-tolerant up to 15% alcohol but others give up before that. And what about the dependent variable (alcohol concentration): will the rate of alcohol production be measured, or just the amount of alcohol present when the yeasts die or the sugar runs out; or will the alcohol be measured after a set time, eg 7 days? Is time important? Some yeasts are slow (eg the CY3079 Slow White yeast from France takes its time but gets there in the end; it would be a brave decision to cut it off after 7 days). Lastly, some yeasts convert malic acid to alcohol (as well as converting the sugar). Imagine using a yeast such as the Lalvin C from France which partially degrades malic acid. Of course you'd get more alcohol out of this one.

Oxygen production is used to measure the rate of photosynthesis

you will Use a Spectrometer or Colorimeter to measure color changes due to photosynthesis.

be used to measure rates of photosynthesis ..

Before you do that, however, we advise you to have a quick look through the remainder of this section together with sections 2.2 and 2.3.
[In addition to the above coloured filters, we have made measurements of a number of neutral density filters and these are detailed in below].

The absorbance of a single thickness of each filter has been measured at 4 nm intervals using a Perkin-Elmer Lambda 9 Spectrometer and the data recorded.

Use a Spectrometer to measure color changes due to photosynthesis.

The iFL provides technology leadership. This is an integrated chlorophyll fluorometer – photosynthesis system with fully programmable microclimate control. It is the first integrated system to provide leaf absorptance measurement, an actinic light source that allows chloroplast migration as found in nature, automation of the instrument zero calibration and housekeeping functions to allow “walk away automation". Direct readout of gm, C, Γ* and R are included. It also includes F' correction option according to Loriaux 2013.

In our measurements, all four methods were examined, and it was found that the mass spectrometer gave the most flexibility and the greatest precision.
In the first experiment, the sulphuric acid concentration was measured using a mass spectrometer and the amount of base compound input was determined.

is used to control the angle at ..



This is a lot simpler as you can cut zinc sheet with scissors. You'll still need Vernier callipers to measure the dimensions, so the error will be larger than with the marble but it may be a lot simpler to make sense of. Hmmm, what concentration acid will I need? Will it heat up?


This has the potential to be a great (not just a good) EEI. More reactive metals will displace less reactive ones from solution. If you've done the Redox unit in Chemistry you will be aware that a reactive metal like zinc, when placed in an aqueous solution of a salt of a less reactive metal (eg Cu as CuSO4 solution) a reaction will occur. The zinc will dissolve to form Zn2+(aq) ions, and the Cu2+(aq) ions in the CuSO4 solution will accept electrons from the zinc to become copper metal. The solution starts off as a bright blue colour due to the presence of Cu2+(aq) ions but as these are consumed the solution gets less and less blue. If you have access to a spectrometer then this would be easy to measure.

Englemann used the rate of oxygen production to measure the rate of photosynthesis.

Measuring The Rate Of Photosynthesis Using A Spectrophotometer

The hydrolysis of ASA to SA has been the subject of many investigations and can be studied in a high school laboratory if equipped with a visible spectrometer such as a . The rate constant "k" for the reaction depends on pH, temperature, buffer concentration, and ionic strength. It can be followed by measuring spectrophotometrically the appearance of the complex of SA with ferric chloride, FeCl3. The method can be found in 2000, Vol 7, p 354 by L. Borer and E. Barry.

25/11/2015 · Variables Questions Abstract like comment share To measure the rate of photosynthesis we used a spectrometer for boiled, unboiled and in the dark chloroplasts.

Lab 4 Plant Pigments and Photosynthesis - Wikispaces

In addition to their range of high-resolution mass spectrometers, MS Tech Solutions also supplies a range of laboratory equipment including custom mass spec benches, noise suppression units and nitrogen generators. MS Tech Solutions also has a range of refurbished mass spec instruments with various upgrade options available.