The endogenous respiration of the rumen ciliate Dasytricha ruminantium maintained under an O2 tension of 2kPa (approximately 0.02 atm) was partially inhibited by KCN (40% inhibition) and NaN3 (58% inhibition). The organisms lack cytochromes, and sensitivity of respiration to KCN, NaN3, chloroquine and quercetin suggest that the operation of flavoprotein-iron-sulphur-mediated electron transport....

purpose: to assess the efficacy of intrastromal rings for management of keratoconus (kcn). methods: this prospective non comparative case series includes 14 eyes of 11 contact lens intolerant patients with kcn. corneal thickness of at least 450 m at the site of segment insertion was required for enrollment. uncorrected visual acuity (ucva), best corrected visual acuity (bcva), refraction, pachy...

Phytochrome-mediated germination of Lactuca sativa L. cv. Waldmann's Green seeds was inhibited strongly by 10 millimolar salicylhydroxamic acid (SHAM), but only slightly delayed by the same level of KCN. SHAM was most effective if applied within the 8-hour potentiation period (release from dormancy) following red light treatment, but much less effective with completely potentiated seeds. SHAM a...

Sir, Synchronous neuronal oscillations in the gamma frequency band (30–80 Hz) are implicated in a wide range of cognitive processes, including memory formation (Varela et al., 2001) and sensory processing (Singer, 1993; Gray, 1994). This rapid, temporally co-ordinated activity in spatially distributed areas of cortex is highly energy dependent, producing large changes in bloodoxygen level depen...

Sir, Synchronous neuronal oscillations in the gamma frequency band (30–80 Hz) are implicated in a wide range of cognitive processes, including memory formation (Varela et al., 2001) and sensory processing (Singer, 1993; Gray, 1994). This rapid, temporally co-ordinated activity in spatially distributed areas of cortex is highly energy dependent, producing large changes in bloodoxygen level depen...

1. The acceleration by bicarbonates of the swelling and hemolysis of erythrocytes in solutions of ammonium salts, first reported by Ørskov, is strikingly dependent upon carbonic anhydrase, being almost abolished by inhibitors of this enzyme such as KCN and sulfanilamide, and under suitable conditions being enhanced by its addition to the external solution. This behavior gives support to the the...

Sublethal ischemic challenges can protect neurons against a second, more severe hypoxic insult. We report here that nonlethal chemical ischemia induces a transient alteration of NMDA receptors in rat cortical neurons in culture. Cells were incubated with 3 mM KCN in a glucose-free solution for 90 min. Analysis of NMDA receptor unitary events in patches excised from KCN-treated neurons showed an...