Membrane protein missing from SDS-PAGE gel?

I am trying to run an SDS-PAGE after his-tag purification of a sample. The protein of interest is an oligomerising membrane protein with an YFP tag attached. When the fractions of the sample from...

07 September 2020 3,277 6 View

Qiagen Viral RNA extraction kit showed similar results for positive and negative control. How should I proceed?

Our team is looking for viral RNA in the environment. We took swabs off of doorknobs using cotton dipped in water and then submerging that swab in viral transport media. We also wiped 1 surface...

08 June 2020 6,532 3 View

What is the acceptable amount (%) of plant amplicon during ITS metabarcoding of endophytic fungi from a plant host?

During metabarcoding of endophytic fungi, many seem to use ITS primer pairs that are not (fully) selective for fungi. We experienced that such primers also amplify the ITS region of an in vitro...

09 March 2020 3,303 2 View

I think isotonic regression should be important in finance. Does anybody know about any applications of isotonic regression in finance?

My feeling is based on the following idea: Expected behaviour of financial data could have ordering properties. For example one may expect the increase in price of some stock in a given time...

21 June 2015 5,343 3 View

For a dynamical system x'=f(x), is there a name for a set of points y such that f(x+y)=f(x)?

15 April 2015 3,422 4 View

What is the lactate threshold or level (needed to reach during warm up) which is the most appropriate to perform the best in a 400m flat race?

Is it necessarily to reach the normal 0.9-1, 1mmol/L or higher, 3-5mmol/L? Does the actual lactate level of an athlete influence the actual physiological state?

03 June 2013 217 2 View

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

Can I measure absorbance efficiency with wavelength in a spectrophotometer?

I measure the wavelength of material in a spectrophotometer and it peaks at 275 and its absorbance is 100. I mix it with an adsorbent and it adsorbs the first material, but when I measure the...

16 February 2021 7,515 5 View

CAT assay in microplate?

I'd like to know if anyone can provide me with a protocol for traditional catalase enzymatic assay in a 96 well microplate, for cell line and/or C.elegans spectrophotometric measurements. Thanks!

11 February 2021 7,273 3 View

How can I quantify the color of a solution?

I know colorimetry has been the standard way by way of measuring the concentration of a particular compound (solute) in a colored solution (solvent or measure quantities of a particular compound...

08 February 2021 2,673 1 View

Bradford assay for insulin: discrepancies between standard curve and sample concentration during crystallisation?

Hi there, I would like to determine the unknown concentration of human insulin in my sample during crystallisation (the concentration range is roughly 0.5 -2 mg/ml, whereas the initial...

06 February 2021 9,370 7 View

RNA concentration: Nanodrop vs Agilent 2100 Bioanalyzer?

Hi guys. I make RNA by in vitro transcription and do cell transfection afterwards. I analyze RNA using Nanodrop and Bioanalyzer. But I found the concentration of RNA measured by these two machines...

05 February 2021 292 3 View

What dilution do I use for my GNP solution UV-Vis and DLS characterization?

I have prepared gold nanoparticles using the citrate reduction method in the lab. I need to characterize them using UV-Vis and DLS, by how much should I dilute my sample for using it in the...

26 January 2021 530 5 View

How to calculate DNA concentration of a sample with high concentration buffer?

I want to calculate the concentration of DNA in an unknown sample. But it's buffer has a high concentration and our nanodrop don't accept that as a blank of dsDNA. Thus I dilute the buffer with...

23 January 2021 9,440 2 View

Anyone know how to dilute strong hydrogel structure?

I am working on PVA-GMA hydrogel that is a really strong polymeric structure like rubber. Because I am in the middle of analysis, it is difficult to dissolve the gel using a common solvent. I...

20 January 2021 3,501 2 View

Why and how to avoid negative values in optical density by spectrophotometry when measurements corrected by blank solvent?

I am trying to assess chlorophyll-a content from coral tissue using spectrophotometry (with SPECTROstar Nano, BMG). However, I always seem to obtain some negative values in my optical density raw...

20 January 2021 1,542 4 View