High-resolution multiparametric MRI of contemporary and waterlogged archaeological wood.

High-resolution NMR images on three different present-day wood samples and an archaeological wood specimen were presented and discussed. Although the spatial resolution is still low to perform dendrology for the exact identification of the wooden species, the T2 -spin-density weighted images exhibit contrasts that are in excellent agreement with optical histological images. On the other hand, T2 * and T1 -weighted images provide physiological information that is not obtainable by the usual light microscopic investigations. Moreover, the diffusion-weighted images show the anisotropic behaviour of the water diffusion coefficient quantified along and perpendicularly to vascular bundles (vessels and tracheids), which can be related to the morphology and size of wooden microstructure. This work suggests that high-resolution multiparametric MRI may be a useful tool to increase the information obtainable from the waterlogged archaeological wood remains in a completely non-invasive and non-destructive approach. Therefore, it would be desirable to further develop the hardware and functional characteristics of MRI scanners to improve their potential application in the field of wooden cultural heritage.

The evaluation of the hydrophilic-hydrophobic interactions and their effect in water-methanol solutions: A study in terms of the thermodynamic state functions in the frame of the transition state theory.

Aqueous solutions of amphiphilic molecules are characterized by the competition between hydrophilic and hydrophobic interactions. These interactions have a different energetic dependence with the temperature. Whereas hydrophilic interactions have been well characterized, a complete theory for the hydrophobic ones is still lacking as well as the comprehension of the effect that the solvent exerts on the solute and vice versa. In this paper from the measured relaxation time, we evaluated the thermodynamic state functions of water-methanol solutions in the frame of the transition state theory. In particular we study the behavior of the Gibbs free energy, enthalpy and entropy of water, methanol and some of their solutions as a function of both temperature and water molar fraction. Our results indicate that the temperature of about 280 K represents a crossover between two regions dominated by hydrophobicity (high T) and hydrophilicity (low T).

Linear Cutting Trepanation in Italy: A Unique Case from Hellenistic Sicily (Third Century BC).

During the archaeological excavations conducted in the Hellenistic necropolis discovered in Messina (Sicily, Italy) dating back to the 3rd century BC., a skeleton showing evidence of cranial traumas and surgical intervention was found. The skull, belonging to a young adult male, presented signs of 4 head injuries produced by both blunt and sharp-edged instruments. The first 2 lesions, located on the frontal bone, were produced by blunt blows and showed signs of long-term survival. The third lesion, located on the inferior portion of the right parietal, suggests a perimortem nonpenetrating linear cut likely caused by a blade instrument. Finally, a rectangular bone loss is visible on the left parietal bone, involving the full cranial thickness with well-delimited cutting edges and no sign of a reparative process. This injury can be interpreted as the result of a trepanation, performed with the technique defined as "linear cutting" and obtained through 4 linear incisions in parallel pairs intersecting at the right angles. The trepanation is likely related to the multiple head injuries exhibited by the patient, who unfortunately did not survive the surgical intervention. Trepanation in Italy has been largely attested since Prehistoric times, but the case from Messina represents the first evidence of neurosurgical intervention performed through the linear cutting technique in the Italian context and the second case in the whole of Europe. This technique might have been imported in Sicily during the Hellenistic period from the Near East, where it is clearly attested.