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Distinguished author

Doctor Francesco Redi.jpg

Francesco Redi
1626–1697. Standard IPNI form: Redi

Francesco Redi was an Italian entomologist, parasitologist and toxicologist, sometimes referred to as the "founder of experimental biology" and the "father of modern parasitology". Having a doctoral degree in both medicine and philosophy from the University of Pisa at the age of 21, he worked in various cities of Italy.

Redi is best known for his series of experiments, published in 1668 as Esperienze Intorno alla Generazione degli Insetti ("Experiments on the Generation of Insects"), which is regarded as his masterpiece and a milestone in the history of modern science. The book is one of the first steps in refuting "spontaneous generation", a theory also known as "Aristotelian abiogenesis". At the time, prevailing theory was that maggots arose spontaneously from rotting meat, which Redi was able to disprove. In an experiment, He used samples of rotting meat that were either fully exposed to the air, partially exposed to the air, or not exposed to air at all. Redi showed that both fully and partially exposed rotting meat developed fly maggots, whereas rotting meat that was not exposed to air did not develop maggots. This discovery completely changed the way people viewed the decomposition of organisms and prompted further investigations into insect life cycles and into entomology in general. It is also an early example of forensic entomology.

In Esperienze Intorno alla Generazione degli Insetti Redi was the first to describe ectoparasites, such as lice (Phthiraptera), fleas (Siphonaptera), and some mites (Acari). His next treatise in 1684, titled Osservazioni intorno agli animali viventi che si trovano negli animali viventi ("Observations on Living Animals, that are in Living Animals") recorded the descriptions and the illustrations of more than 100 parasites. In it he also differentiates the earthworm (generally regarded as a helminth) and Ascaris lumbricoides, the human roundworm. An important innovation from the book is his experiments in chemotherapy in which he employed what is now called "scientific control", the basis of experimental design in modern biological research. Perhaps, his most significant observation was that parasites produce eggs and develop from them, which contradicted the prevailing opinion that they are produced spontaneously. Altogether he is known to have described some 180 species of parasites.

See also: Distinguished authors of previous months.

Species of the month

Death Stalker Scorpion

Leiurus quinquestriatus

Leiurus quinquestriatus

Some facts on this scorpion:

Length: 80-110 mm.

Life span: 5 years

Diet: Small insects, spiders, centipedes, earthworms, and other scorpions.

Range: From the Middle East to the northern zones of Africa, especially Egypt.

Habitat: Scrub land and deserts; hide in small natural burrows or under stones.

Gestation Period: 2 to 5 months.

Number of Offspring: Up to 30.

First described: By the German naturalists Wilhelm Hemprich and Christian Gottfried Ehrenberg, in 1829. It was originally named Androctonus (Leiurus) quinquestriatus.

If you're searching for an unusual pet to impress your friends with, consider Leiurus quinquestriatus. This is one of the most venomous scorpions around. Its sting can be extremely painful for adults and fatal for children. The venom is a powerful cocktail of neurotoxins, with a low lethal dose. One component of the venom, the peptide chlorotoxin, has shown potential for treating human brain tumors. This aggressive arachnid comes in different shades and hues depending on the specific locality. By being active at night, it manages its temperature and water balance, important functions for survival in dry habitats. The flat body helps it hide under stones, bark, wood, or other objects on the ground where it searches for prey or waits in ambush, sensing approaching victims by touch or from the vibrations they cause. The literal translation of the binomial name of this species is "five-striped smooth-tail". Leiurus quinquestriatus belongs to the family Buthidae which contains 89 genera and 971 species.

See also: Species of previous months

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