In-situ tear fluid dissolving nanofibers enable prolonged viscosity-enhanced dual drug delivery to the eye

Liquid and semi-solid formulations are the most commonly used drug delivery systems for ophthalmic diseases. Upon application into the conjunctival sac, these systems introduce a variable and unphysiologically high liquid volume to the eye, resulting in overflow and extensive nasolacrimal drainage, accounting for dosing inaccuracy and short ocular residence time. In this study, we present nanofibrous electrospun scaffolds composed of biocompatible polymers, overcoming these challenges by immediate drug release. The fibers incorporate gentamicin and dexamethasone, intended for the treatment of bacterial conjunctivitis. Upon contact with the ocular surface, the nanofibers immediately dissolve in the tear fluid, quantitatively releasing the two actives, yielding over92% drug recovery, determined with fluorimetric and chromatographic quantifications methods. Simultaneously, the viscosity of the tear fluid increases, shown by complex viscometry measurements. A newly developed ex vivo microfluidic porcine cornea model was used to evaluated ocular residence time. In contrast to fluid eye drops, the contact time was significantly prolonged and 20min after application, an increase in drug availability on the ocular surface of 342% was observed. Biocompatibility of the polymer system was demonstrated in an OECD approved in vitro cornea model. The antibacterial activity after processing was evaluated according to EUCAST guidelines, and storage stability of the system was confirmed over a 12-week period. This innovative drug delivery system poses a highly promising platform technology, overcoming challenges associated with conventional dosage forms for drug delivery to the anterior eye and thus significantly advancing therapeutic approaches.

[Occurrence of vascular canals in alveolar bone]

The authors present the results from the investigation of 414 full-mouth X-rays from periodontally diseased individuals for the occurrence of visible bone canals. The frequency, the form the most frequent location and the age-distribution of the vascular canals as well as the possibility of classifying them according to type and severity of the periodontal disease are discussed. Follow-up examinations in 18 patients, on an average 15 years after the first examination, permit the conclusion that the bone canals cannot be influenced by periodontal treatment, and that they are not associated with the periodontal disease.

[The witness in German criminal case (a contribution from the legal, psychological and psychiatrical view) (author's transl)]

The judgement of adult witnesses in particular cases, as sufficiently made clear by the described special case, is at least as necessary as a specialist's opinion of child testimony. Furthermore, it should be noted that the present modus of criminal proceedings does not allow for adequate objectivation possibilities of testimony of witnesses. Thirdly, it should be pointed out that at least for the so-called key witnesses a specialist's examination, i.e. by a psychiater and a psychologist is of great importance; it seems at least necessary that in problematic cases the specialist or the court should have the possibility to interrogate the witness to the exclusion of the public. It also seems of utmost importance to extend the judge's knowledge in the field relevant to the subject during his university education and also during his further professional instruction in order to enable him to identify problematical cases in time and decide on calling upon an adequate specialist.