Ultraviolet Rays Mechanically Strengthen Spider’s Silks

Strength and structure of spiders' silks.

Spider silks are composite materials with often complex microstructures. They are spun from liquid crystalline dope using a complicated spinning mechanism which gives the animal considerable control. The material properties of finished silk are modified by the effects of water and other solvents, and spiders make use of this to produce fibres with specific qualities. The surprising sophisticati...

Ultraviolet and green receptors in principal eyes of jumping spiders

Spectral sensitivities of cells in principal eyes of the jumping spider Phidippus reqius were measured using techniques of intracellular recording. Three types of cells were found. UV cells had peak sensitivities at 370 nm and were over 4 log units less sensitive at wavelengths longer than 460 nm. Green-sensitive cells had spectral sensitivities which were well fit by nomogram curves peaking at...

SOFT X-RAYS AND EXTREME ULTRAVIOLET RADIATION Principles and Applications

Immunizing potential of vaccinia virus inactivated by ultraviolet rays

[1] In a precedent paper (1*), we have indicated that the vaccinia infection experiments of the rabbit skin can be inhibited by the intradermal injection of the equivalent virus inactivated by ultraviolet irradiation. [2] We have tried next, on one hand, to see if the complete virus is the sole inhibitory factor contained in the virulent materiel. [3] On the other hand, regarding to know if it ...

Soft X-rays and Extreme Ultraviolet Radiation: Principles and.

1.1 (a) Confirm that for a photon energy h ω, with corresponding wavelength λ in vacuum, the two are related by eV nm 1239.842 ⋅ = ⋅ λ ω h Values for physical constants are given in Appendix A, page 419. (b) What wavelength in nm corresponds to photons of energy 543.1 eV? (c) What wavelengths in vacuum are associated with the K and L-absorption edges of neon, chlorine, cobalt, and ruthenium? 1....