Using F-fluorodeoxyglucose positron emission tomography/computed tomography to estimate the length of gross tumor and involvement of lymph nodes in esophagogastric junction carcinoma.

Objective: To determine the optimal approach for estimating the length of gross tumor and involvement of the lymph nodes with F-fluorodeoxyglucose positron emission tomography/computed tomography (F-FDG PET/CT) in esophagogastric junction carcinoma (EGJC). The result was verified with pathologic examination.

Materials And Methods: Twenty patients with diagnosed and untreated EGJC were enrolled.

[Research on THz and Raman Spectra of RNA Nucleobases].

The Infrared and Raman spectra of RNA nucleobases in terahertz (THz) band (1~10 THz) were detected with Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The position of all the characteristic peaks and corresponding vibration modes of RNA nucleobase crystals were obtained with Guassian09 software and energy-based fragmentation approach under periodic boundary conditions (PBC-GEBF) method. The computational results were verified to be in accordance with experimental data, which indicated that the powder of RNA nucleobases is amorphous crystal structure.

[Relationship between retention PM and leaf surface AFM character of six greening trees during autumn in Beijing West Mountain].

This study investigated PM adsorption by leaves of six tree species (Pinus bungeana, Pinus tabuliformis, Salix babylonica, Acer mono, Ginkgo biloba, Populus davidiana) in the West Mountain of Beijing. An aerosol generator was used for quantitative determination of PM adsorption. Atomic force microscopy (AFM) was used to determine micro morphology characteristics on the leaf surface, including roughness parameters and the PM absorption mechanism of tree leaves.