Mine earthquakes are serious disasters in coal mines, especially extremely thick hard strata. This study investigates the occurrence mechanism of fracture-type mine Hydraulic fracturing by ground vertical well was used for shock absorption. Dongtan taken as a case study. Field investigation, theoretical analysis, industrial tests, and field monitoring were revealing mechanism. First, mechanical...

The impact of virtual fracture clinics on medical education Á a medical student perspective A s year 5 medical students currently on a muscu-loskeletal placement, we have had the opportunity to observe orthopaedic consultants and nurses at work in 'virtual fracture clinics'. This new service, recently launched, aims to review patients with potential fractures identified in acute care (1). Compu...

The purpose of this study was to examine by freeze-fracture the ultrastructure of intercellular junctions between mouse pulmonary endothelial and epithelial cells, and to relate this fine structure to that deduced from previous physiological and ultrastructural studies using tracer techniques. Junctions between capillary endothelial cells consist of one to three interconnected rows of particles...

BACKGROUND The effectiveness of bicycle safety helmets in preventing head injuries is well- documented. Recent studies differ regarding the effectiveness of bicycle helmets in preventing facial injuries, especially those of the mid-face and the mandible. OBJECTIVES The present study was conducted to determine the protective effect of a bicycle helmet in preventing mid-face and mandibular frac...

This study evaluates the fracture properties and rear-face strain distribution of nonreinforced and hooked steel fiber-reinforced concrete panels penetrated by projectiles of three different nose shapes: sharp, hemispherical, and flat. The sharp projectile nose resulted in a deeper penetration because of the concentration of the impact force. Conversely, the flat projectile nose resulted in sha...

Freeze-fracture was used to study the membrane events taking place during neurosecretory granule discharge (exocytosis) and subsequent membrane internalization (endocytosis) in axons of neurohypophyses from control and water-deprived rats. En face views of the cytoplasmic leaflet (P face) of the split axolemma reveal circular depressions that represent the secretory granule membranes fused with...

Invasion of erythrocytes by malarial merozoites requires the formation of a junction between the merozoite and the erythrocyte. Migration of the junction parallel to the long axis of the merozoite occurs during the entry of the merozoite into an invagination of the erythrocyte. Freeze-fracture shows a narrow circumferential band of rhomboidally arrayed particles on the P face of the erythrocyte...

AIM The aim of our study was to evaluate the advantages and disadvantages of three-dimensional (3D) plating system in the treatment of mid-face fractures. PATIENTS AND METHODS Thirty mid-face fractures in 18 patients at various anatomic locations were treated by open reduction and internal fixation using 3D plates. All patients were followed at regular intervals of 4th, 8th and 12th weeks res...

The maxilla located in the mid face between strong frontal bars and the andibula. The maxilla consists of a body and four processes: Frontal, zygomatic, palatine, and alveolar processes. The body involves a space to form the maxillary sinus. Different, patterns of maxillary fractures were defined by René Le Fort, which he designed ‘‘lines of weakness’’ and he also described sagittal fractures o...

In order to investigate axolemmal development in a glial cell deficient environment, normal and irradiated dorsal funiculus in rat lumbosacral spinal cord was examined by freeze-fracture electron microscopy. At 3 days of age, normal fibres are all unmyelinated and of small (less than 0.5 micron) diameter. The unmyelinated axons have a moderate density (approximately 850 microns-2) of intramembr...