C Li

Publications (3)6.28 Total impact

• Article: Sex-related differences in the anteroposterior diameter of the foetal cisterna magna.

  G Tao, D T Yew, T Gu, S Liu, Z Ma, X Zhan, L Cheng, C Li
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  ABSTRACT: To measure the anteroposterior diameter of the foetal cisterna magna and observe whether there are differences according to sex. Three hundred and thirty-seven Chinese women with low-risk pregnancies and a singleton foetus between 22 and 38 weeks' gestational age were included in this retrospective study. Informed consent of the volunteer subjects and hospital authority approval were first obtained. Double-blinded for gender, the anteroposterior diameter of the cisterna magna of the foetuses was measured by transabdominal sonography. Magnetic resonance imaging (MRI) was used for those foetuses with mega cisterna magna. All of the foetuses were healthy by prenatal and postnatal examination, including physical and imaging examination. The mean anteroposterior diameter of the cisterna magna of all foetuses was 8.01+/-1.79 mm. The anteroposterior diameter of the cisterna magna had no obvious correlation with the gestational age. The mean anteroposterior diameter of the cisterna magna of 179 male foetuses was 8.63+/-2.16 mm, and the mean anteroposterior diameter of the cisterna magna of 158 female foetuses was 7.87+/-1.74 mm. The size difference was statistically significant (p<0.001). In the 33 foetuses with mega cisterna magna, the number of male foetuses was greater than female foetuses, and the proportion of the foetuses with mega cisterna magna in the male group was significantly higher than the foetuses in the female group (p<0.05). Male foetuses had slightly larger anteroposterior diameters of the cisterna magna than female foetuses. The study would be useful for creating normal range values for the cisterna magna of male and female foetuses.
  Clinical radiology 10/2008; 63(9):1015-8. · 1.65 Impact Factor
• Article: [The Raman spectra of rubidium titanyl arsenate].

  L Li, J Wang, W Cui, S Dong, C Li
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  ABSTRACT: The Raman spectra of rubidium titanyl arsenate (RTA) single crystal with different geometric arrangements were obtained and compared with those of rubidium titanyl phosphate (RTP), potassium titanyl arsenate (KTA) and potassium titanyl phosphate (KTP) single crystals. The assignments of various vibration modes were made according to the experimental results. The strong Raman scattering intensity implies that RTA crystal possesses large nonlinear optical property and the strongest scattering is from the TiO6 octahedron. From the mode splitting of AsO4 tetrahedron, we conclude that the distortion of AsO4 in RTA is larger than that of PO4 in KTP.
  Guang pu xue yu guang pu fen xi = Guang pu 07/1999; 19(3):333-5. · 0.84 Impact Factor
• Article: Mixed micellar medium for the spectrophotometric determination of molybdenum in molybdenum/tungsten mixtures.

  X Huang, W Zhang, G Xu, S Han, Y Li, C Li
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  ABSTRACT: Effects of cetyltrimethylammonium bromide (CTAB) and/or nonylphenoxypolyethoxyethanol (OP) on the absorption spectra of the complexes of molybdenum and tungsten with bromopyrogallol red (BPR) were studied. Based on these effects, a mixture of CTAB and OP was thus selected as a medium for the selective and sensitive determination of Mo in Mo/W binary mixtures. Under the optimum conditions, Beer's law was obeyed over the range 0.06-0.8 mug ml(-1) Mo with molar absorptivity being 1.3x10(5) l mol(-1) cm(-1) and detection limit 0.025 mug ml(-1). For 1.0 mug Mo, at least 20 mug W did not interfere in the determination of Mo with average recovery and relative standard deviation being 99.5% and <2%, respectively. The method developed maintained the features of simplicity and rapidity and, moreover, its selectivity and sensitivity enhanced greatly due to the use of CTAB/OP mixed micellar medium. When coupled with a compatible concentration method, the proposed method could be used for the determination of trace Mo in natural waters.
  Talanta 11/1998; 47(4):869-75. · 3.79 Impact Factor