27 December 2013 1 7K Report

These would be visible in thin section as silt-sized particles cemented with silica.

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What is the most recent thought on bison as part of the historical fauna in the U.S. desert southwest?

I have been in the camp that believed bison were not part of the natural fauna in the desert grasslands. Individual bones found scattered throughout were as a result of trade among indigenous...

09 December 2023 2,452 1 View

What analysis to use with a 2 x 2 repeated measures design with two categorical covariates?

Hi, I conducted a replication of a study and need guidance on the data analysis. In my experiment, participants were exposed to two different stimuli consecutively, with 20 trials for each...

06 June 2023 1,334 7 View

Black dot contamination in my cell culture?

Hi all, I have been struggling with a contamination that looks like black dots in my CHO cell cultures (See photos). It does not change the colour of my media or make it go cloudy. The cells in...

23 May 2023 987 4 View

Protocol for AAV Transduction of K562?

Hey, I want to transduct K562 suspension cells with AAV. The vector is in serotype 9 AAV contains an apotosis-reporter and has a CAGs promoter. The titer of the AAV9 is 2.0 x 10^13 GC/mL. It...

23 January 2023 3,221 1 View

What to do when one item loads on to a factor different to my theoretical definition?

Hi, I have run an exploratory factor analysis (principal axis factoring, oblique rotation) on 16 items using a 0.4 threshold. This yielded two factors, which I had anticipated as the survey was...

12 November 2021 4,944 9 View

How do animals geonavigate, how many animal species can do this, and can/did humans also use the earth's magnetic field to geonavigate?

I have heard of lobsters using the earth's geomagnetic field, and now, sharks. How many other animals navigate use the earth's magnetic field? I have also read that indigo buntings travel at...

14 May 2021 7,924 5 View

Reusable glass serological pipettes for cell culture?

Hi, I am setting up cell culture experiments in a new lab and in an effort to reduce plastic waste I want to use reusable glass serological pipettes. In previous labs I used individually wrapped...

06 April 2021 1,814 7 View

Can bacterial suspension be pipetted directly onto petri dish and agar poured onto it?

Hi, recently I encountered a protocol for plating which was not the usual method I have been practicing (pour LB agar onto plate, allow it to solidify, pipette bacterial suspension onto plate,...

28 February 2021 7,778 3 View

How to know whether SVM algorithms performed well?

When doing machine learning, do we normally use several algorithms for comparison? For example, if the RMSE of SVM is 0.1, how do I come up with the conclusion that this model performed well? Just...

29 February 2020 10,074 8 View

Has repetitive low-dose exposure of immunotherapies been evaluated in nursing staff in the clinical setting?

I am looking to investigate the risk nurses are exposed to when handling immunotherapies, low-dose repetitive exposure and the adaptation of the nurse's own immune system for my Ph.D. I was...

24 January 2020 3,314 0 View

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Is there any possible explanation for the statement written below?

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Geology Doctorate. Available for Post-doc and guest faculty. Please give suggestions. Anywhere in world ?

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