Why Negative peak eluted in HPLC analysis?

I'facing problem while doing HPLC analysis due to negative peak was eluted which was corresponding to the principle peak RT. I tried to remove, with different solvents, but no use. i want to know...

26 November 2020 1,960 5 View

Is there any list available of GRAS (generally recognized as safe) microorganisms with proper references?

Is there any list available of GRAS (generally recognized as safe) microorganisms with proper references?

02 March 2020 1,011 2 View

Which stain is used to see the deposition of oil or oil glands in anatomy section of leaf(transverse section) in cymbopogon?

Cymbopogon is an aromatic grass which produces essential oils as a secondary metabolite so to see the deposition of oil in leaves transverse section of intra and inter species can you suggest me...

28 August 2019 9,357 2 View

What is the difference between lithium ion and lithium polymer battery?

Lithium ion and lithium polymer battery charging and discharging profile was found to be same. Then what is the major difference between both battery?

07 July 2019 9,301 4 View

Homing Receptors for tumor infiltrating T cells?

I am researching how different culture and expansion conditions contribute to a T cell's infiltration of a solid tumor. Was wondering what the best surface / intracellular receptors or ligands are...

26 June 2019 5,072 0 View

What are my THP-1 cells contaminated with?

Hello everyone, I recently thawed THP-1 cells, which were frozen at passage 12 in 2016. I got the cells back to culture in RPMI + 10% FCS + 1% HEPES + 1% PenStrep. The cells seemed to recover...

19 June 2019 7,802 6 View

Temperature rise in unloaded solar cell?

Im doing research on temperature rise in solar cell during open circuit condition or partially loaded. Im sure that when solar cell is in open circuit the energy generated will be transferred as...

04 January 2019 9,904 9 View

Can anyone refer me list of terpene and terpenoid with their Rf values?

I am doing tlc of cymbopogon martini leaves extract (methanol chloroform and Ethyl acetate extract ) can anyone suggest me papers for identifying compounds (terpenoid compounds) with their rf values

17 December 2018 2,817 3 View

Which is the most appropriate tool for testing acaricide resistance of field ticks by molecular methods?

within the PCR which test is most appropriate? For example Allele specific PCR?

16 May 2018 5,773 1 View

Is there a way to check for tranfection and retrovirus production?

04 October 2017 6,478 3 View

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 2 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

Can polymer concentrations be calculated based on the number average molecular weight?

Hello, I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as...

28 February 2021 7,882 2 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

No title

I am trying to find how to know the density needed for a pva electrospinning in a 0.6mm neddle, the electrospinning will be from top to bottom and the problem I really have is the solution because...

25 February 2021 2,615 3 View

How can we theoretically calculate Elemental analysis(percentage) of atoms in covalent organic framework?

For example in one research article the Elemental analysis values of COF-TpPa-1 ( Triformylphloroglucinol (Tp) (63 mg, 0.3 mmol), Paraphenylenediamine (Pa-1) (48 mg, 0.45 mmol) are as follows...

24 February 2021 1,265 6 View

How to Control Whiteflies in coconut leaves?

24 February 2021 1,005 1 View

Is it efficient to do liquid biopsy to investigate the gene expressions of the tumor?

To do liquid biopsy and look for specific gene expressions there are so many published papers. Thera are different protocols and procedures used to isolate circulating cell free RNA or mRNA from...

23 February 2021 7,326 5 View

What reaction will occur when adding hexamine into ammonium nitrate in an acidic medium?

Hello, I am investigating properties of water in oil emulsion explosives. And adding hexamine (hexamethylenetetramine) into one of the phases that are used to make the emulsion should increase the...

21 February 2021 8,680 1 View

How to get/count refractive index in gasses?

20 February 2021 8,202 6 View