Tag Archive: ant


soil fungusToday is ‘Anti Biotics Awareness Day’ in the UK (I think this extends to the whole week in north America). Last night I attended a fascinating series of talks about work being done in the Norwich Research Park (this includes the University of East Anglia, John Innes Centre, Institute of Food Research and Norfolk and Norwich Hospital) to search for ways to expand the options for combatting infectious diseases. 

The Problem

‘Antibiotics are used to treat bacterial infections in humans. Even though these antibiotics are very powerful, some pathogenic bacteria have evolved resistance to all antibiotics currently available. There is an urgent need to find new ways to combat these drug resistant bacteria.’

268044-medicinesSolutions?

Most of the antibiotics we currently use are made by a group of benign soil bacteria called actinomycetes. Scientists are now searching environments not previously investigated to find new actinomycetes which might produce new antibiotics; for example deep oceans, desert, rainforests and insects. They are also manipulating actinomycetes bacteria to produce new antibiotics.

This is the first strand of work I heard about last night. It also featured a fascinating look at leaf cutter ants. You’ve probably seen these minute creatures on nature documentaries. They cut pieces of leaf from nearby plants and take these back to their nest. But they don’t eat the leaves, well not directly anyway. Instead they feed them to a fungus which produces the food they use. A sort of ‘agriculture’ that has been going on for 50 million years! It’s this fungus that scientists are studying, and specifically the antibiotics it produces, to see if they could be useful against human diseases.

The second strand of work concerns improving the diagnosis and use of antibiotics. Up to now we’ve been rather profligate with our use of antibiotics, including in animal husbandry (where they encourage weight gain) and agriculture.

This widespread use of antibiotics has led to the crisis we now face- many bacteria developing resistance to ‘broad spectrum’ (a cocktail) of antibiotics and a lack of will to develop new antibiotics as the investment and risk are judged to be too high in relation to the potential returns by pharmaceutical companies. The technology available for analysing bacterial infections is advancing – the speed is increasing and the costs reducing-  so that it is increasingly likely that a more precise diagnosis of infections can be made and a more targeted approach to using antibiotics can follow. This will both increase the effectiveness of their use and reduce the side effects- of killing off a lot of other (beneficial) bacteria and inducing the development of resistant pathogens.

penicillium_coloniesFinally,  I heard about work being done to harness the inherent bacteriological power of the human body.

Not only are humans walking factories of millions of bacteria, but it turns out that different parts of the body carry different bacteriological ‘eco systems’ of their own. The work to date has revealed the benefit of human breast milk in child development (as well as containing nutrients it transfers a range of bacteria from the mother which help to develop the child’s own bacterial systems). This has included giving ‘pro biotic’ supplements to babies born prematurely to help them make up the deficit they have on full term babies and so helping to reduce infections and premature mortality.

Work is also being done on the human gut and experiments with some very sick patients have shown how powerful an infusion of new bacteria can be in combatting diseases; this infusion takes the form of a ‘faecal transplant’- literally transfusing a healthy person’s gut bacteria to a sick person via their faeces (of course converted into a suitable form!).

On this special day, it’s encouraging to see the work in hand by a wide range of brilliant people (who happen to be on my doorstep) to try to extend our ability to fight infectious diseases. Part of the answer lies in discovering and teasing out new anti biotics from a wider range of soils and other sites, but it seems that better targetting of antibiotics and harnessing the body’s own ‘bacteria factory’ have an important part to play.

To finish, here’s a little quiz about leaf cutter ants…

Further information:

Antibiotic Hunters

BBC News Report

John Innes Ant Cam- live

Old School Gardener

 

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jayA couple of interesting garden observations this week. Having just seen the first signs of slug and snail attack on my newly planted summer bedding (Portulaca) I resorted to the ‘blue sweeties’ to attract and ‘deal’ with the little ….pests.  (Yes, I know I shouldn’t, but I find that they are the most effective way of dealign with mass infestations).

The following morning, a nice ‘crop’ of newly frazzled corpses lay on the beds. I was sitting reading and glancing out of the french doors and saw a Jay land, pick up a snail in it’s beak, and ‘wipe’ it on some soil before flying off with it- and it happened again. An example of a bird that’s learned not to eat slug pellets?

Today, I fixed some supporting timbers to my ‘fruit fence’ (where I’m training a Cherry and a Plum as fans) and a pallet-based reinforcement to the bed the fence sits in (more on this little project in due course), As I was carrying out the summer prune of these two fans, I noticed (a bit late, I know) that the Cherry was covered in black fly. As I expected there were ants (who ‘farm’ the aphids for the sweet juice they suck out of the plant) and ladybirds doing their best to hoover up the infestation. But to my surpise, there were also many solitary bees finding their way into the furled up leaves – I can only guess that they too had discovered the free supply of sucrose!

 Have you seen either of these things in your garden? Do you have an explanation? Do you have any of your own interesting observations?

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