What is the right way to conjugate two acids?

How to conjugate two acids with amine linker?

18 February 2021 4,083 2 View

What is the critical deficiency limit in soil for Mn in wheat crop ? in terms of DTPA extractable Mn?

critical range for Mn in soils is 2.5-4.5 ppm for all plants as an average, but what is the exact amount of DTPA extractable Mn in soil for wheat crop

04 February 2021 4,008 4 View

Which solvent is suitable for product precipitation if reaction has been performed in toluene?

If condensation reaction happened between carboxylic acid and amine and amide is formed. The solvent for this reaction is toluene. After completion of reaction, how to collect product? It should...

03 February 2021 9,796 3 View

Why does the ghost atoms gives error in NICS calculation with wb97xd in gaussian09 ?

In a trial, I am trying to calculate NICS (0 and 1) values for benzene ring using gaussian09. I have placed the ghost atoms at the center, 1A, and 2A above the rings. On using the method/basis...

19 January 2021 3,188 3 View

Any researchers working on Mucuna pruriens with respect to tissue culture?

15 November 2020 8,675 1 View

Name of Journal UGC approved journal in the field of management ?

Hi, I need some reference of Journals which have monthly publication, in the filed of customer care/ luxury segment /consumer insights /CRM 1) Scopus index 2) UGC approved journal - India...

22 October 2020 7,769 3 View

Why my absorbance values are in negative for antioxidant assay by dpph method ?

plant extract stock is 10 mg/mL from which I pipetted 20, 40, 60, 80, 100, 200 uL and made up to 3 mL using methanol then i added 1 ml of 0.004% dpph solution (dissolved in methanol) incubated in...

02 September 2020 1,218 2 View

How to linearize a phase shifter?

Hi, I have a phase shifter design that produces phase shift with applied voltage, which follows a function that could be very closely approximated by a second order polynomial. However, the...

11 July 2020 8,967 2 View

Heterogeneity in a meta-analysis?

At what level, one should accept heterogeneity in a meta-analysis. What are possible calculation/test, if we get heterogeneity.

01 June 2020 9,396 6 View

Salicylic acid is poorly soluble in water, I dissolved in 65% ethanol but it is forming precipitation on storage. What to do? Which solvent is best?

It dissolved in 60-65% ethanol but after few hours if storage at 4 degree Celsius it is forming precipitation

19 January 2020 5,092 9 View

Is there a way to get rid of TEA in a TLC plate in order to do proper staining?

Dear colleagues: I have been trying to establish a few HP-TLC methods in the lab. In general, for quantification purposes, I prefer CuSO4+acid charring, to primuline staining. Lately I have been...

20 January 2021 9,019 1 View

What effect will different solvents have on the ATRP reaction?

I want to do an ATRP reaction, synthesize an ATRP initiator, use DMF as a solvent, and mix DMF, BIBB and TEA to turn red. Why does it turn red? Xylene has been used as a solvent before, and there...

04 January 2021 8,034 3 View

Dear professors, i am confused with how to figure out the tea bag index?

Hello, i am confused with how to figure out the tea bag index,could you please tell me how to compute the letter "a" and "k". Can i use R or Sigmaplot to fix it?

09 December 2020 6,705 3 View

Can you please complete an onlinse survey? (only if you are 18 or over and you consume herbal tea or tisans)?

Hello, I am a research student in MSc Food Science and Innovation at Manchester Metropolitan University for 2019-2020. I would hereby like to invite you to take part in my dissertation research...

30 November 2020 528 2 View

What does this ghost peak come from?

We analyse oligonucletide using Ion-pair reversed phase chromatography. The mobile phase A is composed of triethylamine (TEA), hexafluoroisopropanol (HFIP), water. And the mobile phase B is the...

27 September 2020 4,210 3 View

How can I remove triethylamine tfa salt from my peptide?

I'm now purifying a modified tripeptide which is quiet non-polar and sensitive to acidic condition. Thus I added triethylamine (TEA) to neutralize the HPLC fraction which contains 0.1% TFA and...

07 August 2020 5,396 3 View

How to measure tea powder sample into ppm unit (not the extract, just the sample)?

If I soak 1 g tea powder into 100 mL aquades for 12 / 24 hour, can we assume that it is a 10000 ppm sample, not the extract, just the tea powder liquid (sample)? and if Yes, could you give me...

13 July 2020 1,693 7 View

Is taking coffee and tea without milk beneficial for our health?

Consumption of tea and coffee without milk is considered beneficial for our health. Can you please explain the reasons behind it? what can be other methods for improving sensory characteristics...

14 May 2020 6,096 23 View

Is comparing some rates among the patients with respective rates in general population appropriate in epidemiology?

Is it appropriate to compare rates of (for instance) tea consumers among patients admitted to a hospital with some disease, with rates of tea consumers in general population in the same country?...

11 March 2020 5,560 3 View

Total of polyphenols in tea extracts conc mg/l to mg/g dry tea?

04 March 2020 3,649 7 View