By Dave Goulson
One man's quest to save lots of the bumblebee.
Dave Goulson has consistently been enthusiastic about flora and fauna, from his formative years menagerie of unique pets and dabbling in experimental taxidermy to his groundbreaking examine into the mysterious methods of the bumblebee and his venture to guard our rarest bees.
Once generally present in the marshes of Kent, the short-haired bumblebee now in simple terms exists within the wilds of recent Zealand, the descendants of some queen bees shipped over within the 19th century. Dave Goulson's passionate force to reintroduce it to its fatherland is likely one of the highlights of a booklet that comes with specific examine into those curious creatures, history's dating with the bumblebee and recommendation on easy methods to shield it forever.
One of the UK's most precious conservationists and the founding father of the Bumblebee Conservation belief, Goulson combines Gerald Durrell-esque stories of a child's starting to be ardour for nature with a deep perception into the the most important value of the bumblebee. He information the trivialities of existence of their nests, sharing interesting learn into the results extensive farming has had on our bee populations and at the capability risks if we're to proceed down this course.
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Extra info for A Sting in the Tale: My Adventures with Bumblebees
1961) and Ionov and Karataev (1962). Despite good results obtained in potassium isotope separation (the proportion of scattered ions reached 10 "7 at AMIM ^ 1/40) we can hardly recommend such apparatus as a universal instrument for helium isotope analysis. In order to obtain a resolution power of 1000 to 2000, this mass spectrometer requires a radius of the ion orbit of no less than 200 mm which corresponds to a diameter of pole pieces of about 500 mm. The HD and H3 scattered ion current in such a system cannot be reduced to the required level since the resolution of one of the stages remains less than 1600.
However, a more complex design will inevitably decrease the sensitivity of the entire system. 3 39 To explain what happens when the AM/M values are low, we will discuss in more detail the shape of a mass spectrum peak of the double mass spectrometer. Let us assume that the resolution of the first stage, Ru is much lower than that of the second stage, R2, and that the ion density in the cross-section of the ion beam is constant. Fig. 4 shows the peak shapes of the double mass spectrometer for different cases.
By means of the above techniques, Aldrich and Nier (1948) managed to measure for the first time the isotope composition of terrestrial helium employing a one-stage sector mass spectrometer. 5 kg of the mineral for one determination! Even so, it was impossible to measure 3He/4He ratios less than 10" 7 . , 1966) will not be discussed here as in such system an increase in dis- 50 persion in accompanied by extremely great "tails" of the mass spectrum peaks, which makes it impossible to measure helium isotope ratios less than 10" 6 .