Purified PSI complexes from Spinacia Oleracea L. were exposed to the strong light (PFD=2300μmol m-2s-1) for various period. Along with the illumination the photo-damage process of pigments and proteins of PSI complexes was investigated using absorption, fluorescence, circular dichroism (CD) spectroscopy and SDS-PAGE. It was found from the optical absorption spectra that the maximal ab-sorbance of PSI complexes decreased and maximal peaks blue-shifted during the illumination, and the forth derivative spectra demonstrated that the absorbance decreasing at red region mainly resulted from the aborbance decreasing of the long wavelength Chla, implying that the long-wavelength Chla was readily to be bleached. The CD signals contributed by LHCI decreased more rapidly than other CD signals con-tributed by Chla and Carotenoid, indicating that the LHCI was more sensitive to light than core complexes. It was observed by SDS-PAGE that some small polypeptides of PSI complexes were damaged earlier than reaction cente
Introduction As a major component of musculoskeletal system,bones support body weight,facilitate body motion,protect internal organs,and also play critical roles in mineral homeostasis.Osteoporosis,one of the most common bone diseases,is a result of imbalance in bone metabolism that causes low bone mass and micro-architectural deterioration.The inferior quality of osteoporotic bone leads to a consequent increase in bone fragility and susceptibility to fracture.It is known that osteoporotic fractures occur most frequently in trabeculae-rich skeletal sites such as spine,hip,distal radius,and ankle.With the great increase in the number of senile population,
AIM:To compare the visual and optical performance of eyes with different corneal spherical aberration(SA) implanted with spherical aberration-free intraocular lens(IOLs).· METHODS:Thirty-six patients with different corneal SA had phacoemulsification with implantation of spherical aberration-free IOLs.Patients were divided into 3 groups according to the value of preoperative corneal SA.Eyes with corneal SA <0.10μm were assigned to group A,those with 0.10 ≤corneal SA <0.20μm to Group B,and those with 0.20≤corneal SA <0.35μm to Group C.Best-corrected visual acuity(BCVA),contrast sensitivity,corneal SA,total ocular aberrations,and depth of focus were recorded 3 months postoperatively.Distance-corrected near and intermediate visual acuity was studied to measure depth of focus.· RESULTS:BCVA and contrast sensitivity were similar between groups.There were no significant differences in distance-corrected near or intermediate visual acuity.Corneal SA was similar before and 3 months after surgery in the 3 groups.With a 5.0mm pupil diameter,root mean square values for total ocular higher-order aberrations(HOAs) were lower in groups A and B than in group C.Total ocular SA was lower in group A than in groups B and C.SA was also lower in group B than in group C.Coma and trefoil were similar between the groups.· CONCLUSION:Implantation of spherical aberration-free IOLs in eyes with different corneal SA results in similar visual performance at BCVA,contrast sensitivity and depth of focus.
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