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Palm vein hidden under the skin and its distribution feature is hard to
be stolen, which makes the palm vein recognition to be a high security
biometric authentication method. Contact-less palm vein imaging can avoid the spread of
disease, thus expanding the application range of palm vein biometric
authentication devices. However, due to the different un-derstanding of the right imaging
position and the change of fingers open degree, contact-less palm vein image
led to a certain degree of translation, rotation, scaling and shear, that is,
the image deformation. Image deformation causes the imaging feature unstable. In
this paper, the effect of image deformation to the stability of palm vein
features is studied by some similarity parameters. First, feature points in the
palm were marked, contact-less imaging and con-tact imaging of palm vein were acquired. Then, this
paper calculated the similarity parameters of the contact-less imag-ing to contact imaging and gave
corresponding analysis. Experimental results show that contact-less palm vein
imagingwas stable, and derived the linear regression
equation of relationship between sample space and the recognition rate: y =?0.000903x
+ 1.0332, coefficient of determination R2 = 0.9824. This research provided
effective and detailed data to the study of contact-less palm vein recognition
and gave powerful support to contact-less multi-feature fusion recogni-tion based on hand.
Primary cutaneous marginal zone B-cell lymphoma (MZL) is considered a cutaneous counterpart of extranodal MZL of mucosa-associated lymphoid tissue and an indolent lymphoma. Amyloid deposition in this tumor is very rare. We report here a case of primary cutaneous MZL with massive amyloid deposition. The tumor disseminated to the dura and mimicked primary dural MZL. The patient had a four year history of the recurrence cutaneous lesions with a misdiagnosis of amyloidosis. The correct diagnosis was made after the metastatic dural lesion was confirmed by radiology, pathology and molecular biology approaches. It is of crucial importance for differential diagnosis to avoid misdiagnosis and the patients are indeed required long-term regular examinations and treatment because of the possibility of recurrence or dissemination.
In this study, we, for the first time, tried to apply IC50 values (inhibitory concentration estimated to affect the endpoint in question by 50%) in the MTT colorimetric assay to investigate the cytotoxic effects of highly absorbent foam dressings based on silver zirconium phosphate, a newly nano-based matrix. Our results showed that silver released from dressings based on silver zirconium phosphate attributed mainly to highly cytotoxic to L929 cells cultured with MEM containing 10% fetal bovine serum. In addition, we have also compared the IC50 values among different dilutions of AgNO3 solution, silver based dressing extracts and material reference control (ZDEC) extracts using the optimized MTT assay, along with characterizing the silver content in the dressing extracts using atomic absorption spectroscopy. Results have shown that the IC50 values of AgNO50 solution, silver based dressing extracts and ZDEC extracts are 3.5 μg/mL, 3.8 μg/mL and 8.4%, respectively. And there exist some good agreements between qualitative and quantitative evaluation method as well. In conclusion, our study has led to the view that the IC50 value is a promising quantitative index for screening cytotoxicity with regard to silver based dressings.