How can we determine nitrate and phosphorus concentration in surface and groundwater? What method can be used?

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How can i use remote sensing to check the vegetation change over sub-sahara Africa region?

Advancement of the desert in the sub-sahara Africa

29 December 2012 8,621 15 View

Can I use remote sensing to find the amount of water used by people to farm, or the quantity of water used to produce crops?

For example, using acreage to determine the quantity of water used in farming.

15 October 2012 6,891 3 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

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Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View

How to increase a model accuracy ?

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03 March 2021 6,994 5 View

Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

I just wanted to check if I need to run a linear regression separately if I am using PROCESS MACRO to run mediation analysis. Thank you.

02 March 2021 4,359 3 View

Sample dilution for quantitative analysis using ELISA?

If the detection range is in ng/ml but the reference range is in ug/ml for a molecule or protein in serum or plasma .how to dilute and what is the initial volume to be taken for quantitative analysis

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Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

How to calculate average trend in maximum annual NDVI from MODIS?

I am wanting to calculate the average trend in maximum annual NDVI in Iceland from 2010-2020 using MODIS MYD13Q1 V6. How would I do this? I have currently inserted the NDVI bands from the MODIS...

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Francesco Frondini

Ion Chromatography gives results for many common anions, including nitrate, nitrite and phosphate.

Furthermore IC can be used for the separations of the various phosphorus species (e.g. Ruiz-Calero and Galceran, 2005, Ion chromatographic separations of phosphorus species: a review. Talanta 66 (2005) 376–410)

Elad Dafny

other method, which can be implemented in field studies is An ion-selective electrode (ISE), also known as a specific ion electrode (SIE). In this technique, a transducer (or sensor) converts the activity of a specific ion dissolved in a solution into an electrical potential. see more http://en.wikipedia.org/wiki/Ion_selective_electrode

There are plenty commercial devices that use it (just run google search) for as low as $250. Keep in mind the life time of the membrane is not unlimited...