Light perception

Nultsch W, Hader D-P (1980) Light Perception and Sensory Transduction in Photosynthetic Prokaryotes. 41 111-139 Nyholm RS, see Hall DI (1973) 15 3-51... 

This article elucidates molecular mechanisms in light perception, stimulus transformation and signal transmission in photosynthetic prokaryotes. Special emphasis is put on the distinction between various coupling between different light responses and photosynthesis. 

Nultsch, IV., Hader, D.-P. Light Perception and Sensory Transduction in Photosynthctic Prokaryotes. Vol. 41, pp. 111-139. 

The course of signal transduction during light perception is shown in a simplified form in Fig. 16.10. 

Saini and Sharma [30] reported 145 eye injuries amongst 102 Indian patients treated at a major referral center [30]. There were only seven chemical assault victims, but the authors noted that these patients had more severe injuries than patients with accidental injuries with 71.4% of the eyes of chemical assault victims developing phthis bulbi (a deformed eyeball with no light perception). In contrast, phthis bulbi developed in only 3.6% of patients with accidental chemical exposures [30]. 

Saini and Sharma [30] reported a series of 145 chemical eye injuries in 102 patients treated at a major referral center in India between 1984 and 1991 [30]. Bilateral injuries were seen in 42.1% of patients. Acids and alkalis accounted for 80% of chemical ocular injuries in this series. Two-thirds of the injuries occurred in young people working in laboratories and factories. Roper-Hall Grade III and IV injuries were seen in 52 eyes (35.9%). In total, 102 eyes (70.3%) recovered with a visual acuity of 6/60 or better. Ten eyes (6.9%) had no light perception. Phthis bulbi (a deformed eyeball with no light perception) occurred in 71.4% of the seven deliberate chemical assault victims but in only 3.6% of the accidental ocular chemical exposures. The final visual acuity was better in the eyes with less severe grades of chemical injuries on presentation [30],... 

Atrophy of the eye, ultimate evolution, usual and delayed (in the months that follow the accident) for serious chemical eye bums. This eye is obviously no more functional (absence of light perception). It is then necessary, in aesthetic purposes, to make an eviceration or an enucleation (ablation of the contents of the eye or its totality) allowing the implementation of an eye prosthesis. It is then the anatomical loss of the globe. 

Fig. 8.1 Right eye. No light perception. Presurgery aspect. Clear cornea, calm anterior chamber, old posterior synechia, ext-racapsular surgical aphakia. Normal ocular pressure...

V.E.,4,Russo, P.Galland Sensory Physiology of Phycomycesblakesleeanus(94 ref.) l4(Nultsch, D.-P.Hdder Light Perception and Sensory Transduction in Photosynthetic Prokaryotes (139 ref.)... 

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