H2O2 scavenging activity problem??

When I do the test of plant against the free radicals of H2O2 the control had a value about 0.9126 The critical point is when I prepared the extract with DMSO the absorbance appear more than 2...

09 February 2021 6,430 2 View

Differnce in brain structure or function in faller versus non-faller older adults?

I am looking forward to an article that addressed the difference between anatomy or physiology of the brain in faller versus non-faller older adults.

06 April 2020 2,165 5 View

How to stabilize silver nanoparticles using the plant extract?

Can anybody help me to maintain these nanoparticles for longer periods and how to dry without disrupting the stability? I have synthesized silver nanoparticles using green synthesis methods using...

12 March 2020 3,082 3 View

What are the criterion for selecting switching frequency in a power electronic converter?

Switching frequency is usually a free parameter in power electronic converter designs. Some example criterion can be: 1 - Resonance frequency or soft-switching criterion 2 - Efficiency...

06 November 2019 4,162 16 View

How to modifie TiO2 NP to be hydrophil?

I have TiO2 Nps and I have to disperse them in water, but they are not stable. I am trying to use citric acid as modifier to change surface properties of TiO2, but I don't know how and I didn't...

21 July 2019 5,304 3 View

Matlab code for solving the schrodinger equation with transfer matrix method?

hi i need souce code and simulation of solving schordinger equation using the transfer matrix method thx for help .

12 May 2019 154 1 View

Mineral percentage in XRD?

Dear All I have a carbonate rock and XRD analysis shows the type of minerals in it. but how can I measure the percentage of each mineral with XRD peaks?

15 April 2019 8,295 5 View

How can I use Artificial Bee Colony(ABC) Algorithm or other algorithm for feature selection ?

How can i use Artificial Bee Colony(ABC) Algorithm or other algorithms for feature selection ?

30 November 2018 7,651 9 View

Do Fe3o4@TiO2 and Fe3o4@ZnO core/shell Nanocomposites stable and dispersible in a water solution?

stability and dispersion of these nanocomposite in a solution like brine water are under question. how much time it takes to collapse? I mean agglomeration of particles. I want a solution or...

03 November 2018 4,281 7 View

Hello every one: Im working on Gtn damage model, How can I get the model parameters from inverse methode? Idont like use metallograghic images.

30 April 2017 5,669 2 View

How to access MSCI KLD Stats and Sustainalytics?

Hello all, I'm currently working on my undergraduate thesis and I'm having difficulties trying to access KLD Stats and Sustainalytics because my campus Airlangga University and apparently other...

02 March 2021 8,525 1 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 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...

28 February 2021 6,477 1 View

Do you kow of any database containing data on retention time, log P and polarizability for a large number of molecules?

Hi, I am a chemistry undergraduate doing my dissertation project on HPLC. In my project, I need to predict the HPLC retention time of 20 aromatic molecules, the calibration set. To do this I will...

24 February 2021 2,602 1 View

Any easy method of analyzing vitamin D in foods by HPLC?

Looking for method of extracting and analyzing vitamin D in foods by HPLC

24 February 2021 7,524 7 View

What HPLC Marker(s) should be used to detect anthocyanins in a sample?

What HPLC Marker(s) or standard is used to detect and quantify anthocyanins such as Delphinidin, Cyanidin in a given sample of plant extract?

23 February 2021 1,832 4 View

HPLC baseline failure (ACN/Water)?

My baseline increases without any explanation, it is only fixed by changing the solution B, will it be the column? Reagents? Bomb? Detector? Solution A: H3PO4 0.01% IN WATER Solution B: H3PO4...

21 February 2021 5,656 3 View

Which vial septa the right one to be used for HPLC?

This is the unanswered question stored very long in my mind and till now I could not find a right answer. Google search educated me that the red surface is the PTFE material compatible to wider...

21 February 2021 546 3 View

What is the stability of 2 3-dihydroxyquinoxaline in acidic water?

I'm developing a UHPLC assay, and the fluorescent product is 2,3-dihydroxyquinoxaline. The reaction to produce this requires hydrochloric acid (about 1.2 M). Will storage in this acidic...

20 February 2021 5,820 4 View

How to use bag of words for action prediction?

Hi everyone, I'm working on an action prediction (i.e., early recognition) using Bag-of-Words. I know how to use BOW, but regarding action prediction, there is a subtle problem. In the...

19 February 2021 1,442 4 View