How to find degree of deacetylation of chitosan colorimetrically?

I am working with low DD% chitosan. It doesn't dissolve completely in acidic solutions. How to calculate the degree of deacetylation by potentiometric and acid-base titration, UV spectroscopic...

27 January 2021 8,532 2 View

How can one determine the cause-effect relationship between two variables using linear/logistic regression analysis?

Isn't bi-directional effect/causality difficult to demonstrate? Could it be simply demonstrated by examining correlation, regression or any other metric to measure the goodness of fit? How can one...

17 August 2020 6,717 5 View

How to find if one sentence is negative of another using NLP ?

I have to do a project in which using the product description of any product at any e-commerce website and comparing it with all of the reviews of the product.I have to find out if the description...

26 February 2020 3,419 3 View

TLC cutting made easy, will it make TLC Cutting really easy?

I developed a device for cutting the TLC plates. This is my new invention and this design is registered. I wish to commercialize this product. Please let me know if it is useful for daily...

12 March 2018 4,598 14 View

What is the significance of Rf value of organic compounds in medicinal chemistry ?

Rf values (TLC and HPLC) are used to identify the drug molecules. However this information can be of great value in medicinal chemistry and drug discovery. I think there's a great correction...

30 December 2017 8,826 11 View

What is the standard procedure for Reverse Phase column chromatography?

12 March 2017 193 12 View

On what basis the cole cole plots are separated into three semi-circles in case of poly-crystalline materials?

In a particular frequency range (1-1MHz) the contribution of all types of polarization is expected but still they are separated in cole cole plots.

03 May 2016 3,822 1 View

Can I convert ester to nitrile in one step?

Dear all, I want to convert an ester to nitrile in one step. My structure contains base labile groups so I cannot use ester amine procedures. Is there any method through which I can easily convert...

09 January 2016 2,453 19 View

No title

04 October 2013 6,034 8 View

How to remove ammonium chloride from a reaction if the compound is water soluble?

I am performing a reaction in which I am adding ammonia in a solution containing acetyl chloride and my starting material. I get my final product with ammonium chloride. The final product is...

27 July 2012 4,370 16 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 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...

03 March 2021 1,401 3 View

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 ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View