Experimental investigation of inter-element isolation in a medical array transducer at various manufacturing stages

This work presents the experimental investigation of vibration maps of a linear array transducer with 192 piezoelements by means of a laser Doppler vibrometer at various manufacturing finishing steps in air and in water. Over the years, many researchers have investigated cross-coupling in fabricated prototypes but not in arrays at various manufacturing stages. Only the central element of the array was driven at its working frequency of 5 MHz. The experimental results showed that the contributions of cross-coupling depend on the elements of the acoustic stack: Lead Zirconate Titanate (PZT), kerf, filler, matching layer, and lens. The oscillation amplitudes spanned from (6 ± 38%) nm to (110 ± 40%) nm when the energized element was tested in air and from (6 ± 57%) nm to (80 ± 67%) nm when measurements were obtained under water. The best inter-element isolation of -22 dB was measured in air after cutting the kerfs, whereas the poorest isolation was -2 dB under water with an acoustic lens (complete acoustic stack). The vibration pattern in water showed a higher standard deviation on the displacement measurements than the one obtained in air, due to the influence of acousto-optic interactions. The amount increased to 30% in water, as estimated by a comparison with the measurements in air. This work describes a valuable method for manufacturers to investigate the correspondence between the manufacturing process and the quantitative evaluations of the resulting effects

Feet and fertility in the healing temples: A symbolic communication system between gods and men?

Anatomical ex-votos of feet have always been interpreted as representing the unhealthy part of the body for which patients were asking healing. However, according to the archaeological data and literary sources, another interpretation is also possible: the purpose of this article is to focus on the strong relationship between feet and fertility in the ancient world by cross-referencing the available archaeological evidence with the scientific data relating to this topic. That shed light on an important aspect of the Healing Temples in Greek and Roman medicine

Healing Bodies: the ancient origins of massages and Roman practices

The practice of body manipulation with therapeutic aims has been used in the Western world since the origins of Hippocratic medicine. By retracing the therapeutic use of massage as a therapeutic, preventive and educational practice, the authors attempt to highlight the concepts, techniques and methods of massage and the manipulation of the body in order to offer a valuable and useful historical reconstruction concerning ancient medicine. The study on the relationship between culture, diseases and medicine constitute a significant part of the historical medical research carried out within the Research Project of National Interest PRIN entitled ‘Disease, health and lifestyles in Rome: from the Empire to the early Middle Ages’ funded by the Ministry of Education, MIUR University Research in 201

ELECTROTHERAPY IN THE TREATMENT OF PATIENTS AFFECTED BY RABIES: EXPERIMENTS CONDUCTED AT THE “MAGGIORE” HOSPITAL OF MILAN IN 1865

During the nineteenth century, the scientific context of rabies treatment was weak due to the lack of the literature on specific nosology of the rabies disease, and unspecific and ineffective therapy approaches. Electrotherapy already represented an important therapeutic approach for nervous system diseases, although not specifically for rabies. In the present paper, the authors discuss the use of electrotherapy in the treatment of humans affected by rabies in an experimental study conducted at the Maggiore Hospital of Milan, with the aim of establishing the discovery of a possible specific therapy. By analyzing the printed scientific sources available in the Braidense Library of Milan, the authors describe four experiments conducted on patients of different ages. Symptoms and effects both during and after the electrotherapy are also highlighted. The experiments demonstrated that electricity is not an effective therapy in the treatment of rabies, being rather able to cause serious functional and organic alterations in all the patients. Analyzing the Milanese experiments, the authors reported specific Italian history of a scientific and medical approach to rabies at the end of the 18th century, which led to the promotion of health education, reinforced prevention strategies and opened the way to the vaccination era

Water uptake and swelling in single trabeculæ from human femur head.

The swelling of air-dried single trabeculae from human femur heads was obtained by complete immersion in water and the dimensional changes of the samples were measured over time. The experimental results were analyzed under the viewpoint of the diffusion through a porous material. The dimensional changes of the single trabeculae were 0.26 ± 0.15 percent (length), 0.45 ± 0.25 percent (width) and 1.86 ± 0.97 percent (thickness). The diffusion coefficients were then calculated from the swelling recorded over time and a value of (4.12 ± 0.8) x 10(-10)(m (2)s(-1)) (mean ± standard deviation) was found.   Since the dimensional variations of the specimens is due to the swelling of the collagen bone matrix, this technique could offer new insights for (1) a selective characterization of bone microstructure at the collagen matrix level and (2) the dynamics of diffusion through bone tissue

The "Canone Inverso": when tobacco was not so bad. A Look Back at the Primordial Debate on the tobacco effects in the Occupational Medicine

AIM: The article provides an overview on the beginning and evolutions of medical observations on tobacco induced diseases between Eighteenth and Nineteenth century. METHODS: By searching for historical medical literature, first studies on tobacco-induced diseases focused on production risks rather than on adverse effects that the use of tobacco has for the human health. RESULTS: The approach induced first eighteenth-century authors to define this substance as a non-pathogenic and, consequently, not to consider tobacco factories dangerous for health workers. In those years, tobacco was employed in therapy as a stimulant treatment and it was considered harmless and even healthy and preventive of several acute diseases. CONCLUSIONS: Authors will show that studies on pathogenic effects of smoking will only start around late nineteenth century, when the idea of the healthiness of tobacco industry was already supported

ANATOMIE E CORPI: IL CADAVERE AL MUSEO DA VAN RUYSCH A VON HAGENS

The aim of the conference of which we are here publishing the proceedings, held in Rome at Sapienza-University in 2013, was to valorise the specific museological heritage of Italian Universities, in relation to analogous European and non-European Museums of Anatomy and Pathological Anatomy. A particular attention has been devoted to highlight the history of the origins and evolution of specific museological collections in order to focus reasons and circumstances of their foundation through the analysis of the significances, functions and different cultural contest

A nanostructured look of collagen apatite porosity into human mineralized collagen fibril

Bone tissue is a hierarchical material characterized at nanoscale by the mineralized collagen fibril, a recurring structure mainly composed of apatite minerals, collagen and water. Bone nanostructure has a fundamental role in determining the mechanical behavior of the tissue and its mass transport properties. Diffusion phenomenon allows to maintain an adequate supply of metabolites in the mechanisms of bone remodeling, adaptation and repair. Several analytical and computational models have been developed to analyze and predict bone tissue behavior. However, the fine replication of the natural tissue still represents a challenge. Insights on the structural organization at nanoscale and on the influence of apatite mineral crystals on the diffusion coefficient lead to outline the functional conditions for the development of biomimetic strategies for bone tissue engineering. Thorough understanding of bone nanostructure is essential to improve longevity of bioscaffolds and to decrease the risk of failure by controlling their mechanical and biological performance

Finite element model set-up of colorectal tissue for analyzing surgical scenarios

Finite Element Analysis (FEA) has gained an extensive application in the medical field, such as soft tissues simulations. In particular, colorectal simulations can be used to understand the interaction with the surrounding tissues, or with instruments used in surgical procedures. Although several works have been introduced considering small displacements, as a result of the forces exerted on adjacent tissues, FEA applied to colorectal surgical scenarios is still a challenge. Therefore, this work aims to provide a sensitivity analysis on three geometric models, taking in mind different bioengineering tasks. In this way, a set of simulations has been performed using three mechanical models named Linear Elastic, Hyper-Elastic with a Mooney-Rivlin material model, and Hyper-Elastic with a YEOH material model

Visitantes florales del cultivo de colza en la zona de Tres Arroyos

La presencia de insectos polinizadores es indispensable para la producción de semilla híbrida de colza (Brassica napus L.). Según algunos autores, en cultivos destinados a la industria oleaginosa se logran mejores rindes con polinización entomológica. La colza es una especie atractiva para la abeja melifera y para muchos otros visitantes florales.Área: Ciencias Agrícolas, Produccion y Salud Anima