Who discovered Juvabione?

History. In 1965, Karel Sláma and Carroll Williams made a surprising discovery: paper towels made from the wood of the balsam fir (Abies balsamea, Fig. 1) released vapors that elicited a potent effect on hemipteran bugs of the Pyrrhocoridae family.

Why is Juvabione called paper factor?

The best known example of a plant-derived JH mimic is juvabione or the “paper factor” which was identified after it was observed that fifth instars of the linden bug, Pyrrhocoris apterus, from Europe, failed to mature into normal adults and instead metamorphosed into sixth instar supernumerary intermediates when reared …

What is the role of juvenile hormone?

juvenile hormone, also called Neotenin, a hormone in insects, secreted by glands near the brain, that controls the retention of juvenile characters in larval stages.

How many isoprene units are in a Sesquiterpene?

three isoprene molecules
Each isoprene molecule (sometimes called isoprene unit) contains five carbon atoms with double bonds. The simplest terpenes are monoterpenes that contain two isoprene molecules. Sesquiterpenes have three isoprene molecules and diterpenes have four (Table 3-4).

What is the paper factor?

Definition of paper factor : a substance originally isolated from pulpwood of the balsam fir that is a selectively effective insecticide with activity like that of juvenile hormone. — called also juvabione.

Who discovered the paper factor?

Cai Lun, Wade-Giles romanization Ts’ai Lun, courtesy name (zi) Jingzhong, (born 62? ce, Guiyang [now Leiyang, in present-day Hunan province], China—died 121, China), Chinese court official who is traditionally credited with the invention of paper.

Which is known as juvenile hormone?

What are monoterpenes and sesquiterpenes?

The simplest terpenes are monoterpenes that contain two isoprene molecules. Sesquiterpenes have three isoprene molecules and diterpenes have four (Table 3-4). Because each isoprene molecule has five carbon atoms, it is easy to calculate the number of carbon atoms per molecule (Table 3-5).

What does sesquiterpene mean?

sesquiterpene. / (ˌsɛskwɪˈtɜːpiːn) / noun. any of certain terpenes whose molecules contain one and a half times as many atoms as a normal terpene.