We have studied the effects of an i.v. bolus of thiopentone 4 mg kg-1 on the median nerve somatosensory evoked potentials (SSEP) in 15 unpremedicated patients. The latency and amplitude of the SSEP response over the second cervical vertebra (SC) and sensory cortex (P15, N20, P25) were recorded before and for 12 min after injection. Data were analysed at 0, 4, 8 and 12 min for time-related alter...

Twenty-four patients were recruited and given either sevoflurane or desflurane as their sole anaesthetic. Each patient was given sequentially increasing or decreasing doses at 0.5 MAC intervals, and the median nerve somatosensory evoked response recorded after an equilibration at each concentration. The N20-P25 and P25-N35 amplitudes decreased with increasing agent concentration. However, for b...

The LPCVD of silicon oxynitride has been characterized and optimized using the Design of Experiments method. The data of a half factorial matrix were converted with multiple linear regression analysis into an adequate empirical model: it appeared to be possible to predict the process output parameters (e.g. deposition rate), when applying more or less random input parameters (e.g. process press...

With the increase in surgery done in an ambulatory surgical setting, anesthetic techniques must be evolved whereby patients awaken quickly with minimal side effects and are released home with no fear of recurring anesthetic problems. An experimental study using sufentanil in three combinations of anesthetic agents in a balanced anesthetic technique is presented. Patients (N = 60) scheduled to u...

We have developed a technique to diagnose the stratospheric age spectrum and estimate the mean age of air using the distributions of at least four constituents with different photochemical lifetimes. We demonstrate that the technique works using a 3D CTM and then apply the technique to U M S CLAES January 1993 observations of CFCl 1 , CFC12, CHq and N20. Our results are generally in agreement w...

Recent physiological investigations1-3, 5 have suggested that in humans there is greater sensitivity and discrimination for horizontally and vertically oriented edges and gratings than for diagonal ones. Several investigations have looked for a neuro-physiological counterpart of this effect in striate cortex of the cat and monkey. Two hypotheses have been proposed: (1) Neurons with horizontal a...

The significance of N2O emission from soils cropped with sugarcane was measured at Réduit and Belle Rive. The data demonstrated that N20 emissions from soils receiving 140 Kg N ha-1 was not markedly enhanced with regard to the background level emission from unfertilised soils.

OBJECTIVES To investigate the origin of juvenile muscle atrophy of the upper limbs (Hirayama's disease, a type of cervical myelopathy of unknown origin). SUBJECTS Eight male patients were studied; data from 10 normal men were used as control. METHODS Median and ulnar nerve somatosensory evoked potentials (SEP) were recorded. Brachial plexus potentials at Erb's point (EP), dorsal horn respon...

In 1937, Wilson and Umbreit1 reported that H2 inhibited N2 fixation in red clover plants and when this inhibition proved to be competitive, it implied that N2 and H2 were bound at the same site on the enzyme. The enzyme also binds CO2 and N20' competitively with N2. The first evidence that any compound other than N2 bound at the N2-fixing site could be reduced was supplied when Mozen and Burris...

Enlarged cortical components of somatosensory evoked potentials (giant SEPs) recorded by electroencephalography (EEG) and abnormal somatosensory evoked magnetic fields (SEFs) recorded by magnetoencephalography (MEG) are observed in the majority of patients with cortical myoclonus (CM). Studies on simultaneous recordings of SEPs and SEFs showed that generator mechanism of giant SEPs involves bot...