Synthesis and characterization of phenylboronic acid-containing polymer for glucose-triggered drug delivery.

Thermo-, pH- and glucose-responsive polymeric nanoparticles are of great interest in developing a self-regulated drug delivery system. The novel core-shell nanoparticles were synthesized by self-assembly of a phenylboronic acid-based block copolymer poly-(-isopropylacrylamide)-block-poly(3-acrylamidophenylboronic acid) (PNIPAM-b-PAPBA) and a fluorescent complex glucosamine-poly(-isopropylacrylamide)/Eu(III) (GA-PNIPAM)/Eu(III) based on the cross-linking between PBA- and GA-containing blocks in this work. The nanoparticles can be tuned via thermo-induced collapse or glucose-induced swelling at appropriate pH and temperatures; they had an average kinetic radius was about 80nm, and which showed excellent fluorescence.

Structural evolution of axial intensity distribution during hot image formation.

The structural evolution of the axial intensity distribution during hot image formation perturbed by a small circular optical obscuration is investigated in detail under different conditions. An analytic expression is derived for the axial intensity distribution around the conjugate plane by assuming the thickness of the nonlinear medium to be infinitely small. In view of the analysis of the axial intensity oscillation, the expression can be extensively utilized to characterize the intensity maxima for a nonlinear medium with a finite thickness.

[Unregulated emissions from the gasoline vehicle].

Based on the emission test cycle of China National Regulation Stage III, the aldehyde and alkone emissions and VOCs emissions of three typical gasoline cars were studied with HPLC and TD-GC/MS and the exhausted particulates number and mass concentration were researched using ELPI. The results indicate that the unregulated emissions of different cars is diverse changed, the brake specific emission of the carbonyls in three cars are 36.44, 16.

[Volatile organic compounds concentrations and sources inside new air-conditioned bus].

The distributing profile and concentration level inside new air-conditioned buses with 53 seats have been determined using the method of thermal desorption-capillary GC/MS under vehicle static conditions. Compounds were identified from their mass spectral data by using US National Institute of Standards and Technology (NIST02). The total numbers of identified components were 33 inside buses, including alkenes (15,45.

Measurement of in-vehicle volatile organic compounds under static conditions.

The types and quantities of volatile organic compounds (VOCs) inside vehicles have been determined in one new vehicle and two old vehicles under static conditions using the Thermodesorber-Gas Chromatograph/Mass Spectrometer (TD-GC/MS). Air sampling and analysis was conducted under the requirement of USEPA Method TO-17. A room-size, environment test chamber was utilized to provide stable and accurate control of the required environmental conditions (temperature, humidity, horizontal and vertical airflow velocity, and background VOCs concentration).