Should I acidify Lead (Pb) standards ?

Hello , I have samples digested using Nitric Acid and I want to meausre the Lead Pb concetration in them using Microwave Plasma-AES . Should I acidify the Lead Standards to calibrate the...

08 September 2018 5,047 3 View

How to calculate the actual concentration of heavy metal in soild sample after digestion ?

For example : If I have powder sample wieght = 0.22 g , and I added 25ml of (8 Molar of HCl) and heated up until slight amount of liquid in the bottom of the baker. after digestion sample weight=...

03 April 2018 5,643 4 View

What are the excitation and emission wavelengthes of Thiadiazine and Glutaraldehyde?

what are the excitation and emission wavelengthes of Thiadiazine and Glutaraldehyde? Is there a database for compounds fluorescence proparites ?

02 March 2018 6,846 0 View

Making standards for X-ray fluorescence instrument ?

03 April 2017 7,442 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

Benefits of the 24 welled plate?

We have always used the 96 welled plate, the 48 welled plate but apparently there is much evidence on the 24 welled plate and above all its benefits.It states it is the same you would use on ELISA...

28 February 2021 1,149 1 View

What does it require to be ready for e-Commerce in developing countries?

Most developing countries are not ready for e-Commerce? What dimensions and indicators are there to measure e-commerce readiness of a nation? Please share framework or model and evaluation...

22 February 2021 8,132 6 View

Reliable and Valid Instrument for Causes of Medical Errors?

Is there any questionnaire/survey that measures the causes of medical errors? Example: physician negligence vs. systemic issues. Looking for a reliable and validated instrument. Thank you!

15 February 2021 2,874 4 View

Is an issue for serial correlation when it is not found with the xtreg, fe on its lag ,but the lag become significant when you've vce(robust) std. er?

Dear Sir/Madam I have a dateset that suffers from heteroskedasticity and serial correlation. To address the serial correlation lag my variables of the fixed effect regression. I retrieve the...

15 February 2021 3,700 1 View

How to estimate/know plant virus concentration to make a standard curve in ELISA after serial dilution?

Hello, I am trying to know tomato virus titer/concentration in samples and I will perform serial dilution of the positive control. I wanted to ask How to estimate/know plant virus concentration to...

13 February 2021 6,534 4 View

How do I categories into groups on SPSS?

I am using the 'Revised Cyber Bullying Inventory'. This instrument has 2 sub-scales (bully scale and victim scale). From the responses, they will be divided into 4 groups (pure cyberbullies, pure...

13 February 2021 5,787 4 View

Which is the best wavelength to study aerosol optical depth(AOD) related to climate reseach,which criteria must be adopted in choosing the wavelengh?

We are doing a study on impact of aerosol on precipitation. Which satellite data and which wavelength will be the best. or can some one suggest a criteria to be adopted to choose an instrument...

12 February 2021 6,324 3 View

How to best represent qPCR DD Ct or D Ct as a box plot?

I've been reading up on how to best represent qPCR data, specially on answers given on this site by Dr. Jochen Wilhelm. I understand box plots are the way to go, but I still don't understand them...

11 February 2021 7,228 3 View

How to correctly reference instruments in systematic review following APA?

Hello, I am running into an issue and do not know how to cite / reference correctly here. APA states that instruments and measurements need to be referenced with the author's name. At the same...

11 February 2021 9,523 3 View