[Raman spectra of monkey cerebral cortex tissue].

Monkey cerebral cortex, an important part in the brain to control action and thought activities, is mainly composed of grey matter and nerve cell. In the present paper, the in situ Raman spectra of the cerebral cortex of the birth, teenage and aged monkeys were achieved for the first time. The results show that the Raman spectra for the different age monkey cerebral cortex exhibit most obvious changes in the regions of 1000-1400 and 2800-3000 cm(-1). With monkey growing up, the relative intensities of the Raman bands at 1313 and 2885 cm(-1) mainly assigned to CH2 chain vibrational mode of lipid become stronger and stronger whereas the relative intensities of the Raman bands at 1338 and 2932 cm(-1) mainly assigned to CH3 chain vibrational mode of protein become weaker and weaker. In addition, the two new Raman bands at 1296 and 2850 cm(-1) are only observed in the aged monkey cerebral cortex, therefore, the two bands can be considered as a character or "marker" to differentiate the caducity degree with monkey growth In order to further explore the changes, the relative intensity ratios of the Raman band at 1313 cm(-1) to that at 1338 cm(-1) and the Raman band at 2885 cm(-1) to that at 2 932 cm(-1), I1313/I1338 and I2885/I2932, which are the lipid-to-protein ratios, are introduced to denote the degree of the lipid content. The results show that the relative intensity ratios increase significantly with monkey growth, namely, the lipid content in the cerebral cortex increases greatly with monkey growth. So, the authors can deduce that the overmuch lipid is an important cause to induce the caducity. Therefore, the results will be a powerful assistance and valuable parameter to study the order of life growth and diagnose diseases.

[Study on crystal chemistry and spectra of feldspar from Zhoukoudian granodiorite].

The chemical composition and spectra characteristic of feldspar from Zhoukoudian granodiorite were systematically analyzed. Based on the field work, some feldspar samples were selected for crystal chemistry and structure analysis through EMPA, IR, LRM and XRD. The compositions of the feldspar range between Ab (85.21) Or (0.18) An (9.11) and Ab (90.06) Or (3.00) An (13.27) by electronic microscope probe analysis. According to the XRD peak and its diffraction intensity, the mineral species was found the unit cell parameters were calculated. The absorption bands and peaks of infrared and Raman spectra were also assigned and the results show that the characteristics of its infrared and Raman spectra are in accordance with the ideal atlas of albite. The infrared spectra show that all the analyzed feldspar grains contain structural hydrogen, which occur as OH-. On the basis of the above analyses, the crystal chemistry and structure characteristics of feldspar were summarized.

[Raman spectroscopic investigation on the interactions between liver Cancer cells (SMMC-7721) and fufang Luxiancao particles].

Luxiancao is a new medicine for liver cancer, and is purely natural botanical It has good curative effects and few side effects. The curative mechanism of Luxiancao is unknown. In the present paper, the authors used a 514. 5 nm laser to measure the changes in the Raman spectrum of liver cancer cells (SMMC-7721) treated by Luxiancao at different concentrations. The study can help us know more about the mechanism, efficiency and side effects of Luxiancao. The results show that significant changes were observed in the cells' Raman spectra after reacting with Luxiancao. The intensities at 785 and 1 092 cm(-1), corresponding to DNA phosphate backbone vibration, were reduced; and the Raman bands for the bases A and G at 1 312 and 1585 cm(-1) also decreased, indicating that Luxiancao may be inserted in DNA bases and influence the DNA replications, resulting in the reduction in DNA content and breaking of the DNA strands. Besides, the intensity of 1 360 cm(-1), belonging to Trp, decreased gradually and disappeared in the end, indicating the Trp of cancer cells began to be exposed when adding in Luxiancao. The bands at 1 004 cm(-1) for Phe and 1 656 cm(-1) for proteins alpha-helix also decreased, suggesting that there were changes in the structure of protein and circumstance of amino acid. Moreover, the effects on cancer cells were enhanced gradually with the HCPT concentration increasing. Since a Raman spectrum is a chemical fingerprint of a sample, the different concentration dependent changes in the Raman spectra of individual cells due to reacting with Luxiancao can overcome the limitations of other detection systems used for quantitative and qualitative analysis of the drug.

[Micro-Raman spectra for gastritis and gastric ulcer tissues].

Micro-Raman spectroscopy was employed to identify gastritis tissues and gastric ulcer tissues. The primary spectral differences between the two types of samples include, for gastric ulcer tissues, (1) the intensity of the peak at 781 cm(-1) ascribed to cytosine decreases, while the peaks ascribed to adenine and thymine respectively at 793 and 823 cm(-1) become stronger; (2) the bands of amide I and amide III at 1654 and 1320-1270 cm(-1) respectively, characteristic of alpha-helix structural protein, lose their intensities, and the tryptophan band at 1332 cm(-1) and phenylalanine band at 1003 cm(-1) reduced significantly, while the tryptophan marker at 1554 cm(-1) up shiftes to 1556 cm(-1) with increasing intensity; (3) a blue shift of 1073 cm(-1) line, the characteristic Raman band of lipid, and a reduction in the ratio of 1303 cm(-1) assigned to in-phase CH2 twisting motion to 1268 cm(-1) from =CH in-plane deformation were observed; (4) statistic analysis shows that the ratio of Raman intensities at bands 1449 cm(-1) originating from CH2 group to 1660 cm(-1) from amide I provides a promising standard to distinguish the two tissues.

[Raman spectroscopic study of human serum albumin interacting with 3-picolylamine].

Raman spectra of human serum albumin (HSA) and HSA-3-picolylamine complex were obtained. The spectra indicate the configuration and structural transformations of HSA. The results show that the secondary structure is main alpha-helix, and the binding of 3-picolylamine doesn't change the secondary structure. However, the binding changes the configuration of disulfide bonds, transforms a single tryptophan residue from exposed tryptophan residues to hydrophobic environment, and alters the microenvironment of tyrosine.