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排序方式: 共有149条查询结果,搜索用时 0 毫秒
51.
Vertebral bone density in children: effect of puberty 总被引:12,自引:0,他引:12
Gilsanz V; Gibbens DT; Roe TF; Carlson M; Senac MO; Boechat MI; Huang HK; Schulz EE; Libanati CR; Cann CC 《Radiology》1988,166(3):847-850
To determine changes in bone density during growth, trabecular vertebral density and an index of spinal cortical bone were measured with quantitative computed tomography in 101 children. The children were divided by age into three groups: prepubertal, indeterminate, and pubertal. Compared with prepubertal children, pubertal adolescents had significantly higher trabecular bone density and more compact bone in the spine (P less than .001). After controlling for puberty, vertebral bone density failed to correlate significantly with age, sex, weight, height, surface area, and body mass index. The results indicate that bone density increases markedly during puberty. 相似文献
52.
53.
Pekka K. Vallittu DT BOdont Veijo P. Lassila DrOdont Rolf Lappalainen DrOdont 《The Journal of prosthetic dentistry》1994,71(6)
This study tested the effect on the fracture resistance of acrylic resin test specimens when different amounts of fibers were incorporated in the resin matrix. The fibers used included glass, carbon, and aramid fibers, with 30 test specimens of each concentration of fibers. Transverse sections of the specimens were studied by scanning electron microscope to establish how the fibers behave in the polymerization process. The results indicated that an increase in the amount of fibers enhanced the fracture resistance of the test specimens (p < 0.001). The SEM micrographs of transverse sections of test polymerized specimens revealed void spaces of different sizes inside the fiber roving. 相似文献
54.
55.
Discoid lupus erythematosus-like lesions and stomatitis in female carriers of X-linked chronic granulomatous disease 总被引:2,自引:0,他引:2
FLEMMING BRANDRUP CHRISTIAN KOCH MICHAEL PETRI MORTEN SCHIØDT KIRSTEN STÆHR JOHANSEN 《The British journal of dermatology》1981,104(5):495-505
The skin and oral mucosa were studied in an unselected series of carriers of X-linked chronic granulomatous disease, a hereditary condition in which phagocytic cells display a pronounced functional defect. Three carriers had discoid lupus erythematosus (DLE)-like skin lesions which histopathologically were consistent with DLE of the hypertrophic and profundus type. Four patients had experienced photosensitivity in childhood. Seven patients had recurrent aphthous-like stomatitis which should be distinguished from the recurrent aphthous stomatitis seen in otherwise healthy individuals. The remarkably high incidence of DLE-like symptoms in heterozygous carriers might be related to the presence of mixed populations of defective and normal phagocytes. The variable expression of skin symptoms may be related to uneven distribution of abnormal to normal phagocytes. Female patients with these clinical symptoms, especially the combination of DLE-like skin lesions and aphthous-like stomatitis, should be suspected of being carriers of chronic granulomatous disease and studies of phagocyte function in vitro should be performed, since the diagnosis of the carrier state is of utmost importance for genetic counselling before pregnancy. In order to describe in greater detail the clinicopathological findings and their frequency of expression in the skin and oral mucosa, we have undertaken a prospective study of nine unselected known carriers of X-linked CGD. 相似文献
56.
Neutrophils mediate lipid peroxidation in human red cells 总被引:4,自引:1,他引:3
Activated neutrophils (ANs) are known to release reactive oxygen species that may cause oxidative damage to surrounding tissues. We determined if ANs could induce lipid peroxidation (LP) in human red cells and investigated the mechanism involved in this interaction. We studied neonatal glucose-6-phosphate dehydrogenase (G6PD) deficient, and sickle red cells, since each of these are known to be susceptible to oxidant injury. Neutrophils were isolated from whole blood and activated by incubation with opsonized zymosan. Mixtures of such neutrophils and red cells at a ratio of 1:100 were incubated for two hours at 37 degrees C, after which the malonyldialdehyde content in red cells was measured as an index of LP. All red cells underwent LP after AN treatment, and the degree of LP was proportional to the amount of AN in the mixture. Superoxide dismutase and catalase partially inhibited LP. When compared to normal red cells, only sickle cells demonstrated a significant increase in AN-mediated LP. Conversion of hemoglobin to carboxy-hemoglobin increased AN-mediated LP, whereas conversion to met- hemoglobin decreased AN-mediated LP. The protective effect of met- hemoglobin on LP was less in sickle cells than in normal cells. We conclude that AN can induce LP in red cells in vitro and that sickle cells are more susceptible to this process than normal cells. Hemoglobin can serve as an electron trap and protect the cell against peroxidative damage, but this mechanism is impaired in sickle cells. We speculate that the pathogenesis of hemolysis associated with infectious disease may include AN-induced red cell LP. 相似文献
57.
Objective: For clinical applications of biomarkers, there is a need for multiplex assays using high throughput platforms. The objective of this study was to determine the efficacy of Luminex Multianalyte Profiling (xMAP) technology for measurement of salivary proteins and to evaluate whether multiplex assays are as effective as single‐plex assays and enzyme‐linked immunosorbent assay (ELISA). Results: The average levels of interleukin‐8 (IL‐8) from the single‐plex assay were 3313.2 ± 3759.8 pg ml?1 [oral squamous cell carcinoma (OSCC), n = 20] and 1061.7 ± 1978.8 pg ml?1 (control, n = 20). The IL‐1β average levels from the single‐plex assay were 945.2 ± 1134.8 pg ml?1 (OSCC, n = 20) and 314.2 ± 444.8 pg ml?1 (control, n = 20). The average levels of IL‐8 from the multiplex assay were 2834.9 ± 3385.6 pg ml?1 (OSCC, n = 20) and 947.3 ± 2036.8 pg ml?1 (control, n = 20). The IL‐1β average levels from the multiplex assay were 1013.5 ± 1221.1 pg ml?1 (OSCC, n = 20) and 376.3 ± 576.3 pg ml?1 (control, n = 20). The correlation coefficient between Luminex and ELISA assay for IL‐8 (n = 19) and IL‐1β (n = 19) was 0.91 and 0.84, respectively. Conclusion: Luminex xMAP single‐plex and multiplex assays are as effective as ELISA assays for quantification of proteins in saliva. Both IL‐8 and IL‐1β were expressed at significantly higher levels in OSCC subjects than in the matched healthy control subjects. 相似文献
58.
CHERILYN G. SHEETS DDS YASUYUKI ONO DT †TADANORI TANIGUCHI DT † 《Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.]》1993,5(5):215-220
A method to provisionalize porcelain laminate veneers, similar to previously described methods for provi-sionalizing crowns, is presented. The advantages of this system include the ability to have a prototype restoration for evaluation of esthetics and phonetics, thermal protection, and protection from preparation fracture. Additional advantages include improved tissue health and ease of progressing from the provisionaliza-tion stage to the final bonding stage. 相似文献
59.
Measurements of ionized and total calcium levels in supernatant plasma samples from citrated platelet concentrates (PCs) were made over 7 days of storage. Both ionized and total calcium increased significantly during the storage period: respectively, from 0.074 mM Ca2+ in fresh platelet-rich plasma to 0.084 mM in PCs stored for 7 days (p = 0.017), and from 1.94 mM total calcium to 2.06 mM (p = 0.014) over the same period. The increase in calcium was partially blocked by the addition of platelet activation inhibitors to the PCs. Platelet-poor plasma stored under similar conditions showed no significant change in ionized or total calcium, which indicated that the increases observed in PCs were due to the release of cellular calcium. Significant correlations (p less than 0.01) were found between ionized or total calcium levels and lactate concentration or pH, but not hypotonic shock recovery rate. The demonstration of non-zero levels of ionized calcium makes it likely that Ca2+-dependent enzyme systems such as calpain expression and thrombin generation are active in the plasma of citrated PCs and may contribute to the platelet storage lesion. 相似文献
60.
D Str?b?k DT Brown DP Jenkins Y-J Chen N Coleman Y Ando P Chiu S J?rgensen J Demnitz H Wulff P Christophersen 《British journal of pharmacology》2013,168(2):432-444