[Clinicopathologic features of delayed radiation-induced brain injury after radiotherapy for brain tumor].

Objective: To study the clinicopathologic features of delayed radiation-induced brain injury after radiotherapy for brain tumor.

Methods: The clinical, histopathologic and immunohistochemical features of 9 cases with delayed radiation-induced injury were evaluated.

Results: The disease occurred from 6 months to 12 years after radiotherapy and often presented with headache and muscle weakness.

[Study on intermolecular interaction between 4-aminopyridine and methacrylic acid using two dimensional FTIR spectroscopy].

A two-dimensional infrared (2D IR) correlation spectroscopy technique has been introduced to study the intermolecular interaction between 4-aminopyridine and methacrylic acid. The type and relationship of the bond between 4-aminopyridine and methacrylic acid molecule could not be characterized directly using the one-dimensional FTIR spectroscopy. On the contrary, the interactions between 4-aminopyridine and methacrylic acid molecule were determined using 2D IR correlation spectroscopy.

[Study on effect of heating rate on thermal decomposition of HMX energetic materials by in-situ diffuse reflection FTIR spectrum].

In-situ FTIR spectroscopy is a rising and dynamic technique. This technique combines the advantages of investigation in-situ and accurate structure analysis by FTIR spectroscopy, and can detect real time chemical change in materials at different temperatures and obtain the relationship between micromechanism of materials and temperature. In the present paper, thermal decomposition of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) heated with a rate of 5, 10, 20 and 40 degrees C x min(-1), respectively, was investigated by in-situ diffuse reflection FTIR spectroscopy.

[Study on thermal decomposition of HMX energetic materials by in-situ FTIR spectroscopy].

In-situ FTIR spectroscopy is a rising and dynamic technique. This technique, which combines the advantages of investigation in-situ and accurate structure analysis by FTIR spectsoscopy, can detect the chemical change of materials in different temperature with real time and obtain the relationship between micromechanism of materials and temperature. In the present paper, thermal decomposition of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) heated with 5 degrees C x min(-1) was investigated by in-situ FTIR spectroscopy.

[Application of adjustable oblique position for microendoscopic discectomy].

Objective: To compare the adjustable oblique position with prone position in microendoscopic discectomy (MED) and to evaluate its advantages.

Methods: One hundred and twenty-eight patients who underwent MED during August 2000 and August 2002 were studied. Forty-seven cases were positioned prone, 81 cases were positioned with adjustable oblique position.

Design of temperature sensitive imprinted polymer hydrogels based on multiple-point hydrogen bonding.

Weakly cross-linked temperature sensitive imprinted polymer hydrogels that recognize L-pyroglutamic acid (Pga) molecules via multiple-point hydrogen bonding were designed and synthesized. The amount of adsorption for Pga in imprinted hydrogels is 3-4 times higher than that in non-imprinted hydrogels. The selectivity test of imprinted polymer gels was carried out by using a series of structurally related compounds Pga, pyrrolidine, 2-pyrrolidone, L-proline as substrates.

Fabrication of temperature-sensitive imprinted polymer hydrogel.

Weakly cross-linked temperature sensitive gels that memorize 4-aminopyridine molecules were designed and synthesized. The polymer gels show special selectivity, good thermo-sensitivity and reusability, which would have an enormous potential of application in drug controlled release systems.

[Changes of neural electrophysiology properties of cauda equina in experimental lumbar spinal canal stenosis under dynamic burden].

Objective: To study the changes of neural electrophysiology properties of cauda equina under double level compression and dynamic burdens, and to clarify the mechanisms of intermittent neurogenic claudication.

Methods: Thirty SD rats were divided into 5 groups (6 in each group). The laminectomy of L5 was performed in control group.