Confocal theta fluorescence microscopy using two-photon absorption and annular apertures. In a confocal theta fluorescence microscope, a second objective lens placed orthogonally to the illumination objective lens is used for detection. The addition of annular apertures to such an arrangement leads to a reduction of the volume at half maximum of the point spread function. We show that when the ...

A numerical method based on the SIMPLE algorithm has been developed for the analysis of vapor flow in a concentric annular heat pipe. The steady-state response of a concentric annular heat pipe to various heat fluxes in the evaporator and condenser sections are studied. The fluid flow and heat transfer in the annular vapor space are simulated using Navier-Stokes equations. The governing equatio...

BACKGROUND Mitral annular calcification (MAC) and aortic annular calcification (AVC) may represent a manifestation of generalized atherosclerosis in the elderly. Alterations in vascular structure, as indexed by the intima media thickness (IMT), are also recognized as independent predictors of adverse cardiovascular outcomes. AIM To examine the relationship between the degree of calcification ...

BACKGROUND Ischemic mitral regurgitation (IMR) has been attributed to annular dilatation, papillary muscle (PM) displacement ("apical leaflet tenting"), or both. We compared the efficacy of reducing annular or subvalvular dimensions to gain more mechanistic insight into acute IMR. METHODS Eight adult sheep underwent implantation of radiopaque markers on the LV, mitral annulus (MA), each leafl...

CONTEXT Annular pancreas is an uncommon congenital abnormality. Co-existence of this condition with a pancreaticobiliary malignancy is an exceptionally rare occurrence. CASE REPORT We present a case report of a 78-year-old woman with jaundice due to an ampullary carcinoma associated with an annular pancreas treated by pancreaticoduodenectomy. CONCLUSIONS A collection of previously reported ...

The annular pancreas in adults is a rare congenital anomaly that is detected after development of complications, such as gastric outlet obstruction, recurrent pancreatitis, and peptic ulcer. Duodenal bypass is the procedure of choice for treating duodenal obstruction caused by the annular pancreas in both children and adults. Duodenoduodenostomy is routinely performed in neonates and children. ...

An integrated compact circular-polarized annular ring slot antenna is proposed in this paper. It consists of an annular ring slot radiator and a hybrid patch coupler. The hybrid patch coupler is integrated with the annular ring slot antenna to radiate the circularpolarized wave, while size of the antenna remains the same. Both the impedance bandwidth and axial ratio bandwidth of the proposed de...

O’Brien’s granuloma is a rare skin disease that presents clinically by grouped red papules that may coalesce into annular plaques on sun damaged skin. The annular plaques have raised erythematous borders (3-5 mm)and slightly atrophic center [1].The hypo pigmented central regions are distributed mainly in sun-exposed areas. The sites of predilection include the neck, face, chest and arms. Early ...