CsPbBr Perovskite Nanocrystals for a Q-Switched Pulsed Fiber Laser in the C-Band Region.

All-inorganic perovskite nanocrystals have been widely reported as promising light-harvesting and light-emitting semiconductor nanomaterials. However, their nonlinear optical properties and laser applications have rarely been explored, especially for pulse laser modulation in the telecommunication C-band window. Herein, we experimentally demonstrated a passively Q-switched erbium-doped fiber laser (EDFL) operation at the C-band region using perovskite CsPbBr nanocrystals as a saturable absorber (SA).

Mn-doped CsPb(Br/Cl) mixed-halide perovskites for CO photoreduction.

Halide perovskites have been employed as photocatalysts for CO photoreduction due to their excellent optical properties and unique electronic structure. However, their photocatalytic performance is relatively poor. Herein, we demonstrate a new strategy with Mn-doped CsPb(Br/Cl) mixed-halide perovskites as catalysts to enhance the efficiency of CO photoreduction.

All-inorganic perovskite/graphitic carbon nitride composites for CO photoreduction into C1 compounds under low concentrations of CO.

CsPbBr is widely used in solar cells and LEDs for its excellent photoelectric properties that are also attractive for CO photoreduction, but it is less used in the photocatalytic reduction of CO mainly owing to its limited charge separation efficiency. To alleviate this issue, herein, all-inorganic orthorhombic CsPbBr was combined with graphitic carbon nitride (g-CN) and the resultant composite (CsPbBr@g-CN) showed enhanced activity in CO photoreduction. Under the irradiation of AM1.

Immunogenicity and safety evaluation of bivalent types 1 and 3 oral poliovirus vaccine by comparing different poliomyelitis vaccination schedules in China: A randomized controlled non-inferiority clinical trial.

Background: The type 2 component of the oral poliovirus vaccine is targeted for global withdrawal through a switch from the trivalent oral poliovirus vaccine (tOPV) to a bivalent oral poliovirus vaccine (bOPV). The switch is intended to prevent paralytic polio caused by circulating vaccine-derived poliovirus type 2. We aimed to assess the immunogenicity and safety profile of 6 vaccination schedules with different sequential doses of inactivated poliovirus vaccine (IPV), tOPV, or bOPV.

Emerging ≈800 nm Excited Lanthanide-Doped Upconversion Nanoparticles.

Lanthanide-doped upconversion nanoparticles can tune near-infrared light to visible or even ultra-violet light in emissions. Due to their unique photophysical and photochemical properties, as well as their promising bioapplications, there has been a great deal of enthusiastic research performed to study the properties of lanthanide-doped upconversion nanoparticles in the past few years. Despite the considerable progress in this area, numerous challenges associated with the nanoparticles, such as a low upconversion efficiency, limited host materials, and a confined excitation wavelength, still remain, thus hindering further development with respect to their applications and in fundamental science.

Comparison of the effect of increased hepatitis B vaccine dosage on immunogenicity in healthy children and adults.

Hepatitis B (HepB) infection remains a global public health problem, particularly in China. Vaccination for children and adult who are unvaccinated is an effective method for preventing the disease. In this study, we aimed to compare the effects of increased dosage of HepB vaccine on immunogenicity in healthy children and adults.

From ScOOH to Sc2 O3 : Phase Control, Luminescent Properties, and Applications.

In the controlled synthesis of ScOOH nanomaterials, the surfactant molecule Na3 Cit not only helps to manipulate the crystallographic structures, but also to initiate the transfer from α-ScOOH to γ-ScOOH. Further annealing of ScOOH generates cubic Sc2 O3 with morphologies inherited from respective origins. When doped with lanthanide ions, both ScOOH and Sc2 O3 can be utilized for high-temperature probing and light-emitting-diode lighting.

Sensitive Water Probing through Nonlinear Photon Upconversion of Lanthanide-Doped Nanoparticles.

Lanthanide-doped upconversion nanoparticles have received growing attention in the development of low-background, highly sensitive and selective sensors. Here, we report a water probe based on ligand-free NaYF4:Yb/Er nanoparticles, utilizing their intrinsically nonlinear upconversion process. The water molecule sensing was realized by monitoring the upconversion emission quenching, which is mainly attributed to efficient energy transfer between upconversion nanoparticles and water molecules as well as water-absorption-induced excitation energy attenuation.

Efficacy of antigen dosage on the hepatitis B vaccine response in infants born to hepatitis B-uninfected and hepatitis B-infected mothers.

Objective: To compare the safety and immunogenicity of two dosages of recombinant hepatitis B (HB) vaccine administered to infants born to HB-uninfected and HB-infected mothers.

Methods: A phase III, controlled, single-blinded clinical trial was conducted with 506 healthy newborns. The newborns were assigned to three groups based on maternal levels of HB surface antigen (HBsAg) and HB e antigen (HBeAg): Group A, HBsAg negative; Group B, HBsAg positive and HBeAg negative; and Group C, HBsAg positive and HBeAg positive.

[Study on safety and immunogenicity of oral poliomyelitis attenuated live vaccine (human diploid cell)].

Objective: To evaluate the safety and Immunogenicity of the Poliomyelitis vaccine (Human Diploid Cell) in > or =2 month-old children.

Methods: A random, blind and control trial, 1200 healthy children of 2-5 months old in Jiangsu province were administered OPV (HDC) vaccine and control vaccines. The antibody was tested by neutralization test.

[The immunogenicity and safety of 10 microg recombination yeast hepatitis B vaccine applied in expanded population].

Objective: To assess the feasibility of the 10 microg recombination yeast hepatitis B vaccine in the expanded applicable population group aged 5 - 18.

Methods: People with both HBsAg and anti-HBs negative were selected to take two-stage clinical experiment and the safety and immunogenicity were observed. Safety observation was conducted in 925 subjects, while 568 for immunogenicity.