How to make ppb level concentration ?

Hi, I've N2 gas cylinder and 100 ppm NH3 gas cylinder. With these two cylinders, I'd like to make a ppb level (1- 100) concentration. Any idea how to do that?

01 February 2021 3,264 2 View

The ways to evaluate the conference (Scopus or ISI) and its ranking?

17th International Conference, CDVE 2020 is also ranked as Q2 by Scopus. Could you tell me how to check its ranking?

25 December 2020 4,624 3 View

How to determine the number of iterations of A-optimal projection?

I have read the article "A-Optimal Projection for Image Representation" (A-Optimal Projection for Image Representation). The authors used an iterative method to solve the optimization problem,...

06 September 2020 3,257 1 View

What is the proper aldosterone and CORT supplement in ADX mice?

Hi, I am struggling with the stress experiements in ADX mice. i tried 15ug/ml cort in the drinking water for ADX mice, however, the basal plasma cort are much higher than sham controls( 260ng/ml...

21 June 2020 386 1 View

What's the reason for the crossover of illuminated and dark JV curve in CIGS solar cells?

The distinct crossover anomalies are observed in my recent samples. It's explained in the book that there might be a barrier at the interface or in the absorber's near interface region.The barrier...

29 May 2020 675 4 View

How should I hydroxylate tungsten powder for organosilane grafting?

I am having trouble depositing MPTMS/APTES onto tungsten and I am concerned there are not enough hydroxyl groups on the powder surface. So far I have been exposing tungsten to water to hydroxylate...

04 February 2020 4,677 2 View

How to randomly seperate a region into subregions with different area?

Dear all, I have a watershed and wish to randomly split the watershed into different 'artificial' farms, and the farm area should follow an exponential distribution as found empirically from...

20 January 2020 3,782 3 View

Could I extract RANK/RANKL/OPG mRNA from peripheral blood samples?

I want to know that whether it is possible to extract RANK/RANKL/OPG mRNA from peripheral blood samples instead of tissue homogenates. Thanks a lot.

07 September 2019 7,431 3 View

Anyone could explain if lentivirus is pathogen?

Because lentiviral vectors are derived from the HIV-1 pathogen, biosafety issues are an important concern. I was asked to indicate whether if lentivirus is animal or human pathogen when I try to...

10 July 2019 2,950 3 View

How to make the nano carbon more hydrophilic?

how to make the nano carbon particles (Vulcan XC-72R, FUEL CELL store ) more hydrophilic in 1M KOH solution

02 July 2019 830 3 View

Can Ethovision store the generated data and video recordings directly to NAS system?

The size of data generated by Ethovision is huge. Having NAS system for data storage seems to be a good option, I am wondering whether Ethovision can directly store the data to the NAS system...

27 February 2021 6,350 2 View

How to model Supercritical water gasification (SCWG) process in Homer software?

Hi everyone How to model Supercritical water gasification (SCWG) process in Homer software?

25 February 2021 4,075 1 View

Can cells be reused after using WST 8/ CCK 8 from Sigma Aldrich?

Hi all, Can cells be reused after I have seed them onto 96 well plates and test them with cell counting kit at OD450 (CCK8) at 12 hours, wash them with PBS x3 and add new media and let them...

24 February 2021 5,072 1 View

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22 February 2021 9,932 11 View

Is it okay to mention you distributed your qualitrics study link through social media sites?

Just want to be clear and know it is okay to say I have distributed the qualitrics link through social media such as Facebook, Instagram and Twitter to ensure my target audience is reached in my...

21 February 2021 5,143 2 View

What is the minimum number of exosomes/ml to have a good yield of total RNA for Illumina sequencing?

I am using IZON qEV2 columns to isolate exosomes from 100 ml of cancer cell conditioned medium. in NTA analysis I usually see concentration of 2x10^9 particles/ml. But when I proceed with this...

20 February 2021 6,879 3 View

Any suggestions or recommendations on a good publishing house based on the African for academic books in the field of Communication and media studies?

I am currently working on a book on Public Relations (from an African perspective) and the rationale behind the book is the fact that as instructors in this field, we borrow instances and case...

19 February 2021 2,482 2 View

When to use different framework?

Hi, can I use both conceptual framework and theoretical framework in my systematic review? My future study plan is to use a theory. In this situation for my systematic review should I use both or...

18 February 2021 9,581 2 View

Person-Codes for questionnaires in longitudinal studies: Is there an easy solution for better matching-rates?

Hi, I have a problem regarding matching of longitudinal data in my field of research (university students). We have a Person-Code for matching data measured in different time points, but 30%+ of...

17 February 2021 3,075 4 View

Can anyone provide an advice on running a validation study of a commercially available product in collaboration with the manufacturer?

We are planning to run a study validating a commercially available product (i.e. software) and while we initially planned to do it independently of the manufacturer, they heard about our intention...

17 February 2021 2,295 3 View