A graded representation model for Macdonald's polynomials

We define doubly graded Sn modules Rmu for which we conjecture that the multiplicities of irreducible representations in various bi-degrees are given by the Macdonald coefficients Klambdamu. Assuming one fundamental conjecture, the modules Rmu can be given several equivalent definitions, which we discuss. We prove the conjectures in various special cases.     

Respiratory syncytial virus genotypes and disease severity among children in hospital

OBJECTIVES: To determine the spectrum of N and G genotypes of respiratory syncytial virus (RSV) causing respiratory tract infection and whether particular genotypes are associated with severity of infection. PATIENTS AND METHODS: Nasopharyngeal aspirates (NPAs) were obtained from 114 infants with acute respiratory tract infection due to RSV over two seasons. Viral mRNA was extracted from NPAs or cultured virus, reverse transcribed, and the cDNA amplified by the polymerase chain reaction using primers directed to parts of the N and G gene respectively. Amplicons were separately digested with four different restriction endonucleases for each gene. The fragments were separated by agarose gel, electrophoresis, and the electrophoretic patterns used to assign the various genotypes. Disease severity was assessed as very mild (upper respiratory tract signs only), mild (coryza and signs of lower respiratory tract infection), moderate (requiring nasogastric or intravenous fluids), and severe (requiring oxygen or ventilation). RESULTS: Five of the six known N genotypes were detected, but NP4 and NP2 were found most frequently. There was no association between N genotype and disease severity. Six G (SHL) genotypes were detected. Significantly (p = 0.04) more of the infants infected with the SHL2 genotype had severe or moderate disease. CONCLUSIONS: During the seasonal peaks of RSV respiratory tract infection at least 10 different RSV genotypes cocirculated. While there is no association between N genotypes and disease severity, infection with the SHL2 G genotype appears to result in moderate to severe disease.     

国内真菌性角膜溃疡治疗进展

真菌性角膜角膜溃疡发病率逐年上升,目前主要采用抗真菌药物治疗、手术治疗、抗真菌药物联合手术治疗以及中西结合治疗,尚无特效的治疗方法。本文就治疗该病的最新进展进行了综述。     

丙泊酚对脓毒性休克患者舌下微循环的影响

目的 探讨丙泊酚对脓毒性休克患者舌下微循环的影响。 方法 选取需要机械通气的脓毒性休克患者30例,所有患者依据病情给予经口气管插管并接呼吸机辅助通气治疗。在接受机械通气前及应用丙泊酚镇静后监测患者舌下微循环参数。同时记录患者血流动力学及氧代谢指标进行比较。 结果 所有脓毒性休克患者镇静目标达到Ramsay评分3~4分时平均丙泊酚应用剂量为1.2mg/(kg·h)。镇静后微循环指标出现不同程度改变, 总血管密度TVD(P>0.05)无明显改变;灌注血管密度 PVD(P<0.05)、灌注血管比例PPV(P<0.05)及微血管流动指数MFI(P<0.05)较镇静前下降明显。镇静后去甲肾上腺素泵入剂量较镇静前轻度增加,血流动力学参数CI及MAP较镇静前亦有轻度下降,但二者相比差值无统计学意义(P>0.05)。反应组织灌注指标血乳酸(LAC)及氧代谢指标中心静脉氧饱和度(SvO₂)在镇静后升高(P<0.05)。 结论 脓毒性休克患者应用丙泊酚镇静可以使微循环及氧利用障碍加重。     

60家医院创建无烟医院对医生控烟知识态度行为的影响

目的：通过创建无烟医院活动,了解医生的吸烟状况和控烟知识、态度与行为,并对干预效果进行评价。方法：在北京、上海、广州选择60家医院创建无烟医院,对全院医生开展控烟干预,在干预前对19580名医生、干预后对20772名医生进行问卷调查,了解医生的吸烟状况和控烟知识、态度与行为的变化。结果：通过一年的控烟干预,医生吸烟率由...     

抗体介导的排斥反应与临床

随着器官移植体液免疫理论的发展与抗体检测技术的进步,抗体介导的排斥反应(AMR)已逐渐被认识和引起关注。其治疗难度大、逆转率较低,已成为导致移植物失功的重要原因。本文较为系统地介绍了AMR的免疫机制、诊断与防治进展,以及供者特异性抗体的检测技术和临床意义,从而提出供者特异性抗体是引起移植物排斥反应特别是慢性排斥反应的主要原因,移植受者需常规监测抗体以利及时干预和治疗。