Unravelling the multilayer growth of the fullerene C60 in real time.

Molecular semiconductors are increasingly used in devices, but understanding of elementary nanoscopic processes in molecular film growth is in its infancy. Here we use real-time in situ specular and diffuse X-ray scattering in combination with kinetic Monte Carlo simulations to study C60 nucleation and multilayer growth. We determine a self-consistent set of energy parameters describing both intra- and interlayer diffusion processes in C60 growth. This approach yields an effective Ehrlich-Schwoebel barrier of EES=110 meV, diffusion barrier of ED=540 meV and binding energy of EB=130 meV. Analysing the particle-resolved dynamics, we find that the lateral diffusion is similar to colloids, but characterized by an atom-like Schwoebel barrier. Our results contribute to a fundamental understanding of molecular growth processes in a system, which forms an important intermediate case between atoms and colloids.

The effect of homeopathically prepared thyroxine on highland frogs: influence of electromagnetic fields.

BACKGROUND: Previous experiments show that amphibian larvae are responsive to homeopathically prepared thyroxine. METHODS: We studied the effect of a highly diluted and agitated thyroxine solution exposed to various electromagnetic fields on metamorphosis in highland Rana temporaria. The devices tested were: microwave oven, mobile phone, airport X-ray, and a red light barcode scanner. Animals were treated either with homeopathically prepared thyroxine (10(-30) parts by weight, 10(-35) in the water in which the animals were kept), or analogously prepared blank solution, or analogously prepared thyroxine exposed to the electromagnetic field of one of the devices tested. Solutions were administered at 48h intervals according to a standardized protocol. RESULTS: Animals treated with the standard test solution thyroxine 10(-30) metamorphosed more slowly than the control animals, ie the effect of the homeopathically prepared thyroxine was opposed to the usual physiological effect of molecular thyroxine. The cumulative number of test animals that had reached the four-legged stage at defined points in time was smaller in the group treated with homeopathically prepared thyroxine at most of the points in time. This was found independently by all three research teams involved. In contrast, this effect did not occur when the thyroxine solution had been exposed to the field of the early model microwave oven, or mobile phone. There was no difference between aqueous or alcoholic solutions were used, and there was, if any, only a small protective effect from aluminum foil. Airport X-ray and red light barcode scanning did not diminish the effect of the homeopathic solution.

A new rating scale for the assessment of the alcohol-withdrawal syndrome (AWS scale).

A new rating scale for the quantitative assessment of the alcohol-withdrawal syndrome (AWS) was developed from the CIWA-A scale by item analysis based on the data from 132 alcoholic patients. The clinical evaluation of this AWS scale in a second sample of 256 alcoholic patients showed that it adequately assessed the course and severity of the AWS. The AWS scale provides data for a rational strategy of therapy for the AWS by rating mental and somatic symptoms on different scales. In particular, the mental subscale allows prediction of a complicated AWS. Subjects with an AWS score > or = 10 at admission have a higher risk of becoming delirious than those with a lower score (46.6% vs 2.8%; P < 0.001). In order to minimize the prescription of drugs with abuse potential, such as diazepam and clomethiazole, a structured treatment programme of in-patient alcohol detoxification based on the AWS score was also developed. The comparison revealed that, in the second sample, which was treated following this protocol, the number of cases given medication was lower and the amount of clomethiazole prescribed per patient was less.

Investigation into the genesis of angular lesions at the cervical region of teeth.

A review of the literature concerning the genesis of angular lesions of the teeth implicates occlusal stress as a critical component in the multifactorial etiology of these lesions. Clinical suggestions for the prevention and treatment of such defects are proposed.