Depth apparent resistivity imaging is an important process of data processing and analysis in the aviation transient electromagnetic method. It can provide reference value of conductor depth, vertical extension, and other information, and can accurately provide the measurement of each aviation transient electromagnetic measurement system. The structural section of the apparent conductivity of the one-dimensional layered medium on the line. As an advanced geophysical exploration technology, the aerial transient electromagnetic method has been applied significantly in the exploration of polymetallic minerals abroad in recent years. In this paper, based on the theory of ground-to-air transient electromagnetic method with multiple radiation sources, a corresponding multi-component global apparent resistivity definition method is established. The advantages of using the magnetic field strength to define the global apparent resistivity of the multi-radiation field source ground-air system are analysed. For each component of the magnetic field strength, respective global apparent resistivity algorithms are proposed to realize the multi-component, full-time, and full-space visual resistivity. The resistivity is calculated, and the influence of the offset on the global apparent resistivity is analysed. By adjusting the relative position of the source and the current direction and other parameters, the multi-radiation source transient electromagnetic ground-air system can not only strengthen the signal strength of different components, weaken random interference, but also better distinguish the location of underground anomalies
Enterococcus faecalis has a high detection rate in root canals with failed endodontic treatment. The previous studies had shown the relationship between biofilm formation and expression of virulence factors in digestive disease. In this study, we want to find out the relationship between biofilm formation and expression of virulence factors, like enterococcus surface protein (esp), collagen-binding protein (ace), haemolysin activator(cylA), of E.faecalis recovered from root canals undergoing orthograde retreatment. Fifty clinical patients were recruited. All of them complained at least one of the following symptoms: spontaneous pain, pain of occlusion (apical shadow), sensitive to percussion, parulis and fistula. Most isolates successfully formed biofilms. After 24h of cultivation, the expression of ace, cylA, esp in the biofilm-positive groups were higher than that of biofilm-negative groups (P< 0.05). The expressions of esp and ace were higher than that of cylA in patients with pain of occlusion (P< 0.05). The results indicated patients with six clinical symptoms we studied had higher expression level of virulence factors than those without these symptoms.
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