Hi. Anyone have come across this issue where the baseline is shifted like this when running the hplc? Is it due to contamination or else?

Mobile phase used is 5mM sulphuric acid , type of column is Bio-Rad Aminex

09 July 2020 9,321 7 View

Hi. Do you have any idea why the peak looks like that as I guess this is the solvent peak produced?

I have run the levulinic acid standard through hplc-refractive index detector with column and detector temp at 63 and 50 degree respectively. Mobile phase used is 0.005 M H2SO4 at flow rate 0.6...

12 November 2019 6,348 2 View

How Transfer data/image from GPU to FPGA using MATLAB ?

Currently I Already did my work to transfer image on GPU and CPU. Apart from that, i try to expand the work with FPGA. Unfortunately, i still searching the suitable method how communicate CPU and...

10 October 2018 2,997 3 View

What is the significance of soil microbial biomass N:P value in the agricultural soil?

The microbial biomass ratio is considered as an important indicator of microbial nutritional balance. High microbial biomass C:N ratio for example, usually indicates unbalanced nutritional...

12 February 2018 1,012 6 View

Which oneis better QTOF or QTRAP?

Dear All Which one is better to determine phenolic compound inside the dragon fruit peel either use QTOF or QTRAP? ESI QTRAP is normal resolution but with ion trapping for better spectrum...

21 April 2017 1,180 7 View

Is there any relationship between antioxidant and antimicrobial activity?

Dear All Kindly to ask you, is there any relationship between antioxidant and antimicrobial activity? since I already extract active compound from dragon fruit peel using distilled water as a...

01 September 2016 4,511 14 View

How to write a good thesis abstract?

What are the components should have in writing a clear and good abstract?

06 June 2016 6,780 24 View

Hi, one question related to correlation. Is it possible for me to execute correlation with a sample n=24 to see the relationship between variables?

26 April 2016 3,619 28 View

What is the recommended amount of PCR product to load on DGGE?

I performed PCR which targets bacterial 16S (using GC968f/1401r) and fungal 18S (using NS1/GCFung), each produced ~400 bp and ~350 bp, receptively. The DNA was extracted from soil sample.Can...

22 April 2016 3,134 3 View

No title

My soil sample is of sandy loam. I've done the extraction protocol several times, precisely as stated in the manufacturer's instruction manual but I did not get any good result. The concentration...

18 March 2016 1,779 2 View

How to separate water from glycerol solvent in a solvent recovery vacuum distillation column?

I am currently doing my third year design project. I have been assigned to design a glycerol recovery column in vinyl acetate monomer production. The process unit before the recovery column is an...

01 March 2021 9,525 4 View

What is the state of the drug inside solid lipid nanoparticles (SLNs)?

I am a little confuse with the mechanism of solid lipid nanoparticles (SLNs). The main point of encapsulating drugs into SLNs is because some drugs have low solubility in water. Therefore, SLNs...

01 March 2021 3,703 3 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

Does different dilution factors affect negatively on NH3 reading ?

I have a sample of treated water sample & asked to obtain ammonia conc. in sample using a machine with 5-25 ppm detection range. However, upon testing with different dilution factors, all...

27 February 2021 8,483 3 View

LEDs on Vis Light photo degradation of MB water sol via N doped TiO2 in a mini flume?

Good day to all, I have no experience with light emitting diodes. I am building a glass mini flume to demonstrate the photo degradation of Methylene Blue in water running over self cleaning...

26 February 2021 4,026 5 View

To date, according to health authorities, 30% of the population's diseases are initiated by drinking water pollution. Do you know this problem?

The main studies are as follows: * regular and timely receipt of information about the state of the environment using automated systems (stationary and mobile); * operational analysis of the...

23 February 2021 912 5 View

Multinomial probabilities and confidence intervals - obtaining the CI of the reference category?

Hi, Some background to my question: I have fitted 1st order multinomial Markov models with covariates. Since all probabiilties (for each row of the transition matrix) sum to 1, I estimate only...

22 February 2021 2,541 4 View

How can I improve the concentration of banana fruits extracted RNA?

Currently, I'm working with banana fruits. I've tried to do RNA extractions with different methods, and I've gotten total RNA without contamination, but I couldn't get a high concentration of...

22 February 2021 6,126 2 View

What are some underexplored theories and concepts in Activated Carbon as A Water Filter?

Hi, me and my team mates are currently planning to pursue the topic of Activated Carbon from Coconut as a Water Filter. And we would like to ask for your suggestions and knowledge on what specific...

22 February 2021 6,569 3 View

How to extract water soluble amino compound from after aqueous work up?

4-Dimethyl amino pyridine is used in reaction.Product formed contains amino group along with amide & is highly water soluble. To remove 4-DMAP aqueous work up done. Please give solution. Thanks.

21 February 2021 1,883 1 View