Plekhanov Georgy Valentinovich. The most famous aphorisms

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APHORISMS OF FAMOUS PEOPLE
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Aphorisms of famous people. Plekhanov Georgy Valentinovich

Aphorisms of famous people

Free library / Aphorisms of famous people

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Plekhanov Georgy Valentinovich. The most famous aphorisms

If human character is created by circumstances, then it is necessary, therefore, to make these circumstances worthy of a person.
People... seek their way to heaven for the simple reason that they have lost their way on earth.
Between science and life there is a very close, inseparable, and for none of them in the least humiliating connection: the more science serves life, the more life enriches science.
Every task is difficult, if only one does not want to do it; every task is easy, for which we undertake with full conviction of its fruitfulness and necessity.

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ginkgo insecticide 01.11.2019

Chemists at Scripps Research (USA) have come up with an effective method to create a synthetic version of the plant compound bilobalide, which is naturally produced by ginkgo trees. This is a significant breakthrough because bilobalide and closely related compounds have potential commercial value as drugs and "green" insecticides.

Ginkgo trees produce an insect repellant compound, but it is not actually toxic to humans. The new method allows chemists to obtain and study bilobalide and related compounds relatively easily and much cheaper than previously possible.

The ginkgo tree (Ginkgo biloba) is considered a living fossil. Its related species existed on Earth 270 million years ago, before the advent of the dinosaurs, and managed to survive the subsequent global cataclysms that destroyed the dinosaurs, as well as many plant and animal species.

Given this heritage, it is not surprising that individual varieties of ginkgo trees today are unusually hardy and long-lived. Some specimens are thousands of years old. Traditional Chinese medicine includes the use of ginkgo extracts to treat various ailments. It is also believed that even the leaves were used in ancient times as bookmarks to protect against paper-eating insects such as silverfish.

A likely factor in G. biloba's longevity is a set of insecticidal compounds found in its leaves and nuts. These include the ginkgolide compounds, which can cause dangerous bleeding in people who take them in high enough doses. As well as lesser-known ones, such as bilobalide, which has a strong effect on insects, but, apparently, is practically not toxic to humans. Bilobalide is also rapidly degraded in the environment, which is an excellent property for a "green" insecticide.

However, bilobalide has a complex carbon skeleton structure with eight oxygen atoms, which makes its synthesis inherently difficult. Previously published methods have been quite time consuming, partly because of the difficulty of getting all these oxygen atoms in the correct position.

The new synthesis method, developed principally by graduate students Megan Baker and Robert Demore, and by Ph.D. Masaki Ohtawa, culminated in a procedure in which the bowl-shaped molecular architecture was revealed and the final oxygen atom was placed at a precise location within it.

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