AIM: To study the instant effect of circumstance temperature on mechanical properties of single living intact human red blood cell. METHODS: The shape, size, membrane bending elastic modulus and shear elastic modulus of single living intact red blood cell was determined with non-invasive, in situ, real time by employing a static micro-image analyzing and a dynamic micro-image analyzing system. RESULTS: The contact area and diameter of red blood cells were decreased as the temperature increased from 35 ℃ to 43 ℃. The membrane bending elastic modulus and shear elastic modulus of single living intact red blood cell were the least at physiological temperature 37 ℃. CONCLUSION: Red blood cells are easy to carry out their physiological functions such as carrying oxygen to all of the body with the best shape and mechanical deformation at 37 ℃.

AIM: To investigate the pharmacological effects of recombined basic fibroblast growth factor (rbFGF) on retinal ganglion cells (RGCs) of rats. METHODS: Using calibrated cross-action forceps a moderate crush injury was inflicted on the nerve. After crush injury, rbFGF, saline and VB 12 were administered by retrobublar injection. Four weeks after injury , the apoptosis of RGCs was measured with flow cytometer. RESULTS: Four weeks after operation, it was shown that the rbFGF, but not saline or VB 12 injection could significantly improve the maintainance of RGCs of rats. After 800 U, 1600 U and 2400 U rbFGF injection, the injured RGCs were rescued by 24.5%, 27.3% and 28.5% respectively. Furthermore, it was also found that rbFGF injection could effectively prevent the axons from injury. The flow cytometer showed that the rate of apoptosis was reduced markedly on 7 days at rbFGF group. CONCLUSION: rbFGF can significantly promote the functional repair of injured optic nerve. [

BACKGROUND:There is a great difference of grade size of macrobead in various joint diseases; therefore, it can be used to determine state of joint diseases initially.OBJECTTVE : To explore the physical properties of synovial fluid nano-particles and their correlations with the occurrence of knee osteoarthritis (KOA).DESIGN: Controlled experimental study based on synovial fluid samples.PARTICIPANTS: A total of 99 synovial fluid samples were collected from normal subjects and KOA patients with various KOA severities. Among them, 41 were normal synovial fluids, 58 were KOA.METHODS: Synovial fluid samples from individuals with and without KOA were obtained. Using the technology of quasi-elastic laser scattering, nano-particle size and its distribution were estimated, and the dynamic/static light scattering spectrometric analyzer allowed the measurement of particles Zeta potentials. A correlation analysis between the particle size, Zeta potentials and the onset of KOA was attempted.MAIN OUTCOME MEASURES:① Grade size and distribution of microsome in synovial fluid;② Zeta potentials and distribution of microsome in synovial fluid; ③ grade size and clinical correlation of microsome in synovial fluid.RESULTS: ① The mean nano-particle diameter in the synovial fluid of KOA patients were significantly greater than those of normal joints [(297±84), (63±23) nm, P ＜ 0.001]. The distribution curve of KOA synovial fluid nano-particle size was normal knee and (-15.84 ±3.34) mV of KOA patients, and there was a significant difference (P ＜ 0.001). This suggestedthat the Zeta potentials in the synovial fluid of KOA patients were significantly greater than those of normal joints. ③ The average particle size and Zeta potential of synovial fluid strongly correlated with the integrity of the joint of KOA (rp =0.797 2,0.631 9, P＜ 0.01).CONCLUSION: The nano-particle size and Zeta potential of synovial fluid are significantly correlated with the development of KOA, and this can reflect the severity of KOA.