Why am i not getting solid after reacting APTES with salicylaldehyde?

The reaction of APTES with salicylaldehyde in ethanol leads to the formation of imine compound yellow solid which is mention in literature, but I am not getting yellow solid I don't know why? when...

28 February 2021 2,955 2 View

How can I remove bubble in WPU film?

I am trying to prepare water-based polyurethane films. When dried air bubbles were formed and destroys the film homogeneity, then I can't use this for mechanical test because of defects. Is there...

26 January 2021 701 1 View

How to deal with negative factor loadings while performing PCA-MLR to calculate quantitative source contribution in air pollution studies ?

If I am getting some negative values in factor loadings while performing principal component analysis (PCA), then I should use that negative values to calculate daily source contribution using...

22 December 2020 5,248 1 View

What are the source markers of Naphthalene, Acenaphthylene and Acenaphthene in ambient atmosphere ?

Is any article available which reports the sources of these PAHs ?

22 December 2020 8,738 1 View

How does the N value be counted for gut content analysis?

I read some articles on mollusc and fish diet analysis. The formula for percentage frequency of occurrence stated above: %F0 = Nei/Ne x 100 and percentage numerical abundance : %NI : Ni/N x...

15 October 2020 4,568 3 View

Why is it necessary to vortex and incubate in dark the sample and DPPH solution and other DPPH questions?

Hi all, In the determination of Antioxidant capacity of fruit samples, I used DPPH assay and have a few questions regarding the DPPH assay 1) why is it necessary to vortex and incubate in dark...

30 August 2020 246 3 View

How to renew the Scopus index status of a journal?

Dear Researchers, Our journal (ISSN no. 2070-4658) was part of the Scopus index till 2017. Now, it is not in the Scopus index as the last two years no issue has been published. However, the...

24 August 2020 7,203 3 View

Hello,i extract my plants using rotary evaporator and i got crude extract.How should dilute it?i have no idea on how to dilute it?Can someone helpme?

dilute it in ethanol or dmso? which solution is better as i used 95% of ethanol as my extraction solvent?

23 March 2020 5,971 6 View

Can I set "20 uL reaction volume" in PCR cycler machine, while my actual sample is only 10 or 15 uL?

This is a stupid but quite technical question. We have a PCR machine that has 20 uL minimum reaction, so it can't be set into 15 or 10 uL in the machine. Is this going to affect the result...

22 March 2020 3,497 4 View

Is there any SOP to measure pharmaceutical clean room and if none can we develop our own method to measure the room size?

06 March 2020 866 1 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 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

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

Shall I skip the measurement model in SmartPLS?

Hello everyone, I had run a mediation model in SmartPLS using questionnaires that were already validated among my statistical population. A professor who edited my paper -though she is not...

01 March 2021 3,052 3 View

What is involved in morphological changes of SEM images of a substance?

In the sem analysis of CaCO3 nanaoparticles, the morphology images showed spherical shaped particles but the proposed morphology for these type of nanoparticles is trigonal. I prepared the...

01 March 2021 1,960 4 View

Does anyone know HRM channel in a 2 plex QIAGEN Rotor- Gene Q qPCR can be used as a separate channel?

I am going to have 3 different probes in my qPCR work that I am going to do. But I realized that the machine we have in the lab is a Rotor-Gene Q 2plex HRM Platform, saying it has green, yellow,...

01 March 2021 8,544 1 View

I have designed reflectarray element and feeding it though Horn Antenna on HFSS. After full wave simulation, I am not getting desired results?

I have designed reflectarray element to generate OAM beams at 5.8GHz and feeding it though Horn Antenna on HFSS. After full wave simulation, i am not getting desired results i.e Radiation pattern...

01 March 2021 9,701 5 View