John Speakman

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Questions related from John Speakman

Does anyone know of values for plasma steroids in aged mice?

Hi We are doing some analyses of steroids in mice under CR. The mice are 8 months old when we take the samples. The levels of steroids are much lower than in mice aged 8 weeks. But this is also...

12 December 2018 7,392 4 View

Is there an accepted way to classify global variation in human ethnicity?

I am looking for a way to classify ethnicity of participants in a global project. It seems that in most countries that operate a census there are questions on the census forms about ethnicity -...

01 January 2018 6,896 4 View

When examining relationships between traits such as physiology and longevity should we remove the covariance due to body mass?

About 10 years ago I published a paper in Aging Cell in which I suggested that the field of comparative studies of ageing had become confused because large numbers of papers had been published in...

02 February 2014 3,168 48 View

Oxidative stress as a mediator of life history trade-offs: some important questions - any thoughts?

There has been much recent interest in the role played by oxidative stress as a mediator of the life history trade-off between reproduction and survival. Field studies of birds and mammals have...

11 November 2013 442 65 View

Can someone advise on the collection of bone marrow from mouse?

We need to collect a sample of bone marrow from mice post mortem. We haven't done this before and wonder if people who have experience of doing it have any advice on exactly how it should be done...

10 October 2013 3,513 6 View