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51.
对32例再障患者的甲襞、球结膜微循环及血粘度进行观察,结果表明:再障组均有不同程度的微循环异常改变(100%),与正常对照组比较差异显著(P<0.01);再障组全血粘度、全血还原粘度明显低于正常对照组(P<0.01),再障患者的Hb与全血粘度及血浆比粘度呈正相关。 相似文献
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This paper introduces a very general and flexible model for the study of hemodynamic changes in congenital heart disease. The generality of the model makes it possible to use the same computer program (which is included in an Appendix) to study both the fetal circulation and the adult circulation, as well as such diverse disease states as patent ductus arteriosus, ventricular septal defect, atrial septal defect, tetralogy of Fallot and transposition of the great arteries. In this paper, only patent ductus and ventricular or atrial septal defect are studied, with special emphasis on the influence of increasing pulmonary vascular resistance on the shunt flow. In the case of patent ductus and ventricular septal defect, the computed shunt flow is very time-dependent and the left-to-right shunt becomes first bidirectional and then right-to-left as the pulmonary resistance increases. By contrast, the computed shunt flow of atrial septal defect is nearly time-independent and is also somewhat less sensitive to the pulmonary vascular resistance. 相似文献
55.
Sequence comparison of human and yeast telomeres identifies structurally distinct subtelomeric domains 总被引:6,自引:2,他引:6
Flint J; Bates GP; Clark K; Dorman A; Willingham D; Roe BA; Micklem G; Higgs DR; Louis EJ 《Human molecular genetics》1997,6(8):1305-1313
We have sequenced and compared DNA from the ends of three human
chromosomes: 4p, 16p and 22q. In all cases the pro-terminal regions are
subdivided by degenerate (TTAGGG)n repeats into distal and proximal sub-
domains with entirely different patterns of homology to other chromosome
ends. The distal regions contain numerous, short (<2 kb) segments of
interrupted homology to many other human telomeric regions. The proximal
regions show much longer (approximately 10-40 kb) uninterrupted homology to
a few chromosome ends. A comparison of all yeast subtelomeric regions
indicates that they too are subdivided by degenerate TTAGGG repeats into
distal and proximal sub-domains with similarly different patterns of
identity to other non-homologous chromosome ends. Sequence comparisons
indicate that the distal and proximal sub-domains do not interact with each
other and that they interact quite differently with the corresponding
regions on other, non- homologous, chromosomes. These findings suggest that
the degenerate TTAGGG repeats identify a previously unrecognized,
evolutionarily conserved boundary between remarkably different subtelomeric
domains.
相似文献
56.
在休克过程中,体内活性氧代谢与细胞内钙超负荷存在着相互影响。为了研究林克和复苏过程中钙拮抗剂对脂质过氧化的影响,用17只杂种犬快速放血使平均动脉压为5.32kpd,并维持90min。然后回输全部失血。在休克30min时,各组别静脉注射(15min内)硫氮酮(40g/kg·min ̄(-1)),异搏定(10μg/kg·min ̄(-1)),或等量生理盐水。复苏后150min处死动物,取心、肝、肺、肾、胰和小肠组织备检。结果显示,用硫氮酮和异搏定治疗组,各主要脏器组织中黄嘌呤氧化酶活性和丙二醛含量均显著低于休克对照组。而各检测组织中超氧化物歧化酶活性变化不一。这些资料显示钙拮抗剂抗休克的机制与其阻滞Ca2+内流,降低组织中黄嘌呤氧化酶活性,抑制脂质过氧化有密切关系。 相似文献
57.
STUDY OBJECTIVE: To determine whether mucosal sensory dysfunction is present at multiple upper-airway sites in patients with obstructive sleep apnea (OSA). DESIGN: Physiologic testing of consecutive patients with OSA and nonsnoring controls. SETTING: University hospital sleep center. PARTICIPANTS: Thirty-nine subjects with OSA and 17 controls. INTERVENTIONS: Endoscopic testing was used to determine sensory detection thresholds for air-pressure pulses delivered to the oropharynx, velopharynx, hypopharynx, and larynx (aryepiglottic eminence). The air-pulse stimulus intensity required to elicit the protective laryngeal adductor reflex was also determined. MEASUREMENTS AND RESULTS: There was a significant impairment in sensory detection threshold for OSA versus control subjects in the oropharynx, as previously described by ourselves using other techniques, as well as at the velopharynx (median 11 mm Hg [confidence interval 9-11] for subjects with OSA vs 8 mm Hg [confidence interval 4-11] for controls, P = .03) and, at the larynx, 4 mm Hg [confidence interval 2-9] for subjects with OSA vs 2 mm Hg [confidence interval 2-3] for controls, P < .001). The threshold stimulus intensity for the laryngeal adductor reflex was also significantly higher for OSA subjects. For OSA patients with abnormal laryngeal sensation (61% of OSA subjects), there were significant correlations between laryngeal sensory values and measures of apnea severity, including apnea-hypopnea index (r = 0.82, P < .001) and nadir SaO2 (r = -0.48, P < .05). CONCLUSION: Mucosal sensory function is impaired at multiple upper-airway sites in OSA. 相似文献
58.
低频超声透皮给药的研究进展与应用 总被引:1,自引:0,他引:1
低频超声可以增强包括大分子药物在内的许多药物的透皮传输,其主要机制是超声的空化作用,大多数人认为是通过改变角质层角化细胞排列结构来提高皮肤渗透能力的.低频超声透皮给药已被人们用于离体实验和动物活体实验,到目前为止,无论是小分子透皮传输还是大分子透皮传输都有很多成功的例子.但是真正通过低频超声透皮导入药物进行治疗的临床应用报道很少,需要更进一步大量的临床试验以确定其安全性与实用价值.一旦其安全性得以证实,合适的低频超声透皮仪研制成功,低频超声快速透皮必将成为一种安全、有效、可控、经济的新型给药方式. 相似文献
59.
60.
Kobayashi K Healey RM Sah RL Clark JJ Tu BP Goomer RS Akeson WH Moriya H Amiel D 《Tissue engineering》2000,6(1):29-38
A novel method of quantitating cell migration has been proposed for the potential utilization of tissue engineered scaffolds. Applying Alt's conservation law to describe the motion of first passage ACL and MCL cells, we have developed a quantitative method to assess innate differences in the motility of cells from these two ligamentous tissues. In this study, first passage ACL and MCL cells were cultured from four mature New Zealand white rabbits. One side of the cell monolayer was scraped completely away to create a wound model. The cell moved into the cell-free area, and cell density profiles were analyzed at 6 h and 12 h. Values of the random motility coefficient (mu) were then estimated by curve fitting the 6 h and 12 h data to a mathematical model, derived from the conservation law of cell flux. During 6 h of incubation in medium supplemented with 1% FBS, MCL cells (mu(MCL) = 4.63 +/- 0.65 X 10(-6) mm(2)/sec) were significantly (p < 0.05) more mobile than ACL cells (mu(ACL) = 2.51 +/- 0.31 X 10(-6) mm(2)/sec). At 12 h, the MCL cells also appeared to move faster (mu(ACL) = 4.39 +/- 0.63 X 10(-6) mm(2)/sec, mu(MCL) = 6.59 +/- 1.47 X 10(-6) mm(2)/sec), but the difference was not statistically significant (p = 0.18). Exposure of the cells to growth factors PDGF-BB or bFGF for 6 h had no significant effect on the migration of the ACL and MCL cells. However, exposure of the ACL cells (p < 0.05) and the MCL cells (p = 0.19) to 1 ng/mL of PDGFBB for 12 h enhanced their migration. Incubation with a high concentration (100 ng/mL) of PDGF-BB or bFGF at concentrations tested (1 or 100 ng/mL) for 12 h, produced little or no migratory stimulation on these ligament cells. Our findings support the previous qualitative observations made by numerous investigators. The novel methodology developed in this study may provide a basis for tissue engineering, and the results may be applied to tissue reconstruction techniques of the knee ligaments. 相似文献