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A stable mode-locked fiber laser (MLFL) employing multi-layer graphene as saturable absorber (SA) is presented. The multi-layer graphene were grown by chemical vapor deposition (CVD) on Ni close to A-A stacking. Linear absorbance spectrum of multi-layer graphene was observed without absorption peak from 400 to 2000 nm. Optical nonlinearities of different atomic-layers (7-, 11-, 14-, and 21- layers) graphene based SA are investigated and compared. The results found that the thicker 21-layer graphene based SA exhibited a smaller modulation depth (MD) value of 2.93% due to more available density of states in the band structure of multi-layer graphene and favored SA nonlinearity. A stable MLFL of 21-layer graphene based SA showed a pulsewidth of 432.47 fs, a bandwidth of 6.16 nm, and a time-bandwidth product (TBP) of 0.323 at fundamental soliton-like operation. This study demonstrates that the atomic-layer structure of graphene from CVD process may provide a reliable graphene based SA for stable soliton-like pulse formation of the MLFL.

Studies have shown cell鄄 free microRNA (miRNA) circulating in the serum and plasma with specific expression in cancer, indicating the potential of using miRNAs as biomarkers for cancer diagnosis and therapy. This study was to investigate whether plasma miRNA鄄 21 (miR鄄 21) can be used as a biomarker for the early detection of non-small cell lung cancer (NSCLC) and to explore its association with clinicopathologic features and sensitivity to platinum鄄 based chemotherapy. We used real鄄 time RT鄄 PCR to investigate the expression of miR鄄 21 in the plasma of 63 NSCLC patients and 30 healthy controls and correlated the findings with early diagnosis, pathologic parameters, and treatment. Thirty鄄 five patients (stages IIIB and IV) were evaluable for chemotherapeutic responses: 11 had partial response (PR); 24 had stable and progressive disease (SD+ PD). Plasma miR鄄 21 was significantly higher in NSCLC patients than in age鄄 and sex鄄 matched controls (P < 0.001). miR鄄 21 was related to TNM stage (P < 0.001), but not related to age, sex, smoking status, histological classification, lymph node status, and metastasis (all P > 0.05). This marker yielded a receiver operating characteristic (ROC) curve area of 0.775 (95% CI: 0.681 -0.868) with 76.2% sensitivity and 70.0% specificity. Importantly, miR鄄 21 plasma levels in PR samples were several folds lower than that in SD plus PD samples (P = 0.049), and were close to that in healthy controls (P = 0.130). Plasma miR鄄 21 can serve as a circulating tumor biomarker for the early diagnosis of NSCLC and is related to the sensitivity to platinum鄄 base chemotherapy.

Dexamethasone can lower the amylase, endotoxin and TNF-alpha levels as well as mortality of SAP rats. NF-kappaB plays an important role in multiple organ injury. Further studies should be conducted to determine whether dexamethasone can ameliorate the pathological changes of multiple organs by reducing the NF-kappaB expression in the liver and kidney. The advantages of tissue microarrays in pancreatitis pathological examination include time- and energy- saving, and are highly efficient and representative. The restriction of tissue microarrays on the representation of tissues to various extents due to small diameter may lead to the deviation of analysis.