Compact multicolor two-photon fluorescence microscopy enabled by tailorable continuum generation from self-phase modulation and dispersive wave generation.

By precisely managing fiber-optic nonlinearity with anomalous dispersion, we have demonstrated the control of generating plural few-optical-cycle pulses based on a 24-MHz Chromium:forsterite laser, allowing multicolor two-photon tissue imaging by wavelength mixing. The formation of high-order soliton and its efficient coupling to dispersive wave generation leads to phase-matched spectral broadening, and we have obtained a broadband continuum ranging from 830 nm to 1200 nm, delivering 5-nJ pulses with a pulse width of 10.5 fs using a piece of large-mode-area fiber.

Low noise, self-phase-modulation-enabled femtosecond fiber sources tunable in 740-1236 nm for wide two-photon fluorescence microscopy applications.

We have demonstrated widely tunable Yb:fiber-based laser sources, aiming to replace Ti:sapphire lasers for the nJ-level ultrafast applications, especially for the uses of nonlinear light microscopy. We investigated the influence of different input parameters to obtain an expansive spectral broadening, enabled by self-phase modulation and further reshaped by self-steepening, in the normal dispersion regime before the fiber damage. We also discussed the compressibility and intensity fluctuations of the demonstrated pulses, to reach the transform-limited duration with a very low intensity noise.

Haplotype analysis of CTLA4 gene and risk of esophageal squamous cell carcinoma in Anyang area of China.

Background/aims: To study the effect of cytotoxic T-lymphocyte antigen 4 gene haplotypes to susceptibility of esophageal squamous cell carcinoma.

Methodology: A gender- and age-matched case-control design was used in this study. PCR-RFLP method was used to detect the genotype of CTLA4 in 205 patients and 205 control individuals in the Anyang area.

[Correlation of XPD gene with susceptibility to gastric cancer].

Background And Objective: Mutations in DNA repair system are related to carcinogenesis. This study was to evaluate the correlations of polymorphisms and haplotypes of XPD gene with individual susceptibility to gastric cancer.

Methods: Genomic DNA were extracted from peripheral blood leukocytes of 207 gastric cancer patients and 212 healthy controls.

[A clinical study of abnormal bone metabolism in patients with HBV liver cirrhosis].

Objective: To study the pathogenesis of abnormal bone metabolism in patients with HBV liver cirrhosis.

Methods: NM-300 signal-energy X-ray absorptiometry system was used to measure the bone mineral density (BMD) in 61 liver cirrhosis patients and 30 age-matched healthy controls. The serum levels of 1,25(OH)2D3, parathyroid hormone (PTH), calcitonin (CT), bone gamma-carboxyglutamic acid-containing protein (BGP), IL-1beta, IL-6, tumor necrosis factor (TNF)alpha and urine crosslaps were also detected in these patients.

[Studies of the association between angiotensinogen gene regulation and cytokines in essential hypertension].

This study is to explore the association between M235T allele polymorphism of angiotensinogen (AGT) gene and cytokines using essential hypertension probands research method. In hypertensives and controls, polymerase chain reaction combined with restriction endonuclease digestion was used to detect the target genotype variation, and enzyme-lined immunosorbant assay (ELISA) was used to detect the cytokine concentrations (IL-1, IL-6, TNF). The results showed that in hypertensives AGT gene, TT genotype was 55.