17 April 2023 4 5K Report

I want pruchase the standards for hplc from Sigma aldrich for study the chemical Composition of some plant, and i want the widlely compounds used

More Amin Bouchfara's questions See All
Is the box plot of climatic indices better illustrate from daily data or annual data?

Hello, I hope you have a good time. I work on a research project about temperature indices. Due to the high number of indices, I only work on tables and maps on an annual time scale. In other...

19 February 2021 9,742 2 View

Are there alternatives to the Devarda alloy when estimating nitrogen?

Are there alternatives to the Devarda alloy when estimating nitrogen? devarda alloy is reducing the nitrate to ammonium

15 February 2021 8,838 3 View

Does anyone have any unreported cases of the Barakat (HDR) syndrome?

Barakat (HDR) syndrome is characterized by the triad of Hypoparathyroidism, sensorineural Deafness and Renal disease. In 2018 I published a paper entitled "Barakat AJ, Raygada M, Rennert OM....

29 December 2020 8,647 2 View

Manuscript with journal for two years despite six positive reviewer comments due to delays and journal incompetence: How to resolve this?

I am trying to help a friend resolve a problem I have never encountered as an author or as a journal editor. The manuscript was transferred to a journal belonging to Elsevier in December 2018. It...

26 December 2020 9,584 3 View

Anyone knows a Postdoc position in Marketing?

Dear Profs, Associate Profs, and Assistant Profs, I graduated with a Ph.D. in Marketing from Graduate School of Business, Universiti Kebangsaan Malaysia (GSB-UKM) in 2019. GSB-UKM is an...

23 December 2020 8,873 3 View

What is the better option to improve immunity ? Medicine or diet ?

What is the better option to improve immunity ? Medicine or diet ? As per Ayurveda, Oja is the Bala (~immunity) which is originated by the Ahara which further nourishes Rasa, Rakta etc Dhatu and...

21 December 2020 4,427 10 View

Can you help me in matlab code for calculation solubility of essential oil in super critical CO2?

#super critical CO2 #Matlab code #extraction #thermodynamic

07 December 2020 5,318 1 View

Can I download books that have been publishes in 1990, 2009and 2016?

I wanted to know if there are still protected by publisher

26 November 2020 3,486 2 View

Help me find the transfer function of the following non linear coupled ODE system ?

I need to find the transfer function for the system in MATLAB. I do know the ss2tf command but its not that simple. Please guide.

08 November 2020 4,414 1 View

Why isn't the response surface method frequently used in asphalt tests like 4PBT/SCB?

I want to use Box-Behnken design (BBd) For reducing my tests.(4PBT/SCB/ITS/ITSM)

21 October 2020 9,071 1 View

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what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

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How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

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

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How to calculate Total Flavonoid?

I analyzed flavonoid total spectrophotometry, the procedure as below: 2 ml supernatan added 5 ml dd.H2O, then added 0,15 ml NaNO2 5%, 5 minutes later added 0,15 ml AlCl3 10%, After 6 minutes,...

01 March 2021 6,722 1 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

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Can I use TCA instead of TFA for protein analyis in RP-HPLC?

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25 February 2021 2,388 3 View

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