Biophysical, histological and biochemical changes after non-ablative treatments with the 595 and 1320 nm lasers: a comparative study

BACKGROUND/PURPOSE: The objective was to compare the efficiencies of the 595 nm pulsed dye and the 1320 nm Nd : YAG laser non-ablative rejuvenation. METHODS: KM mice were irradiated with the 595 nm pulsed dye and the 1320 nm Nd : YAG lasers. Histological changes were evaluated immediately, 1, 7, 21, 30 and 60 days after the two laser treatments. Skin hydration and hydroxyproline content were measured to quantify the degree of improvement of the skin's water-holding capacity and the rate of hydroxyproline synthesis. RESULTS: Although not statistically significant, the 1320 nm Nd : YAG laser treatment induced 9.7% greater improvement of skin hydration than the 595 nm laser while the 595 nm pulsed dye laser treatment led to a thicker dermis and 8.7% greater increase of hydroxyproline than the 1320 nm laser. More than 50% increase of collagen type I was observed in 75% of 595 nm laser-treated sites and 42% of 1320 nm laser-treated sites, and more than 25% increase of collagen type III was observed in 75% of 595 nm laser-treated sites and 50% of 1320 nm laser-treated sites. The 595 nm laser treatment was better in increasing the amount of collagen fibers, especially collagen type I (P < 0.05). CONCLUSION: Our results demonstrated that the 595 nm laser appeared to be more effective in increasing new collagen formation, while the 1320 nm laser was superior to the 595 nm laser in improving the skin's water-holding capacity.     

复合式小梁切除术中采用角巩膜缘后界1mm结膜切口的疗效观察

目的：观察改良的角巩膜缘后界1mm结膜切口在复合式小梁切除术的临床疗效。

方法：回顾性分析原发性青光眼171例220眼,根据结膜瓣切口不同及缝合方法不同,分为三组,A组采用传统的角巩缘切口33例44眼,B组采用角巩缘后界1mm结膜切口76例94眼,C组采用B组结膜切口基础上连续缝合结膜瓣62例82眼,随访1a。观察术后眼压、滤过泡、前房深度、结膜切口有无渗漏,并进行组间比较三组的临床效果。

结果：术后切口漏水、浅前房发生A组>B组>C组,具有统计学意义(P<0.05),手术成功率94.5%,术后眼压控制和滤过泡形态无明显区别。

结论：角巩膜缘后界1mm结膜切口制作结膜瓣,同时采用结膜切口连续缝合,愈合快,发生结膜切口漏水明显减少,显著能提高复合式小梁切除术的成功率。     

高效液相色普法测定兔灌胃后血清中百草枯浓度及其变化特征

目的 探索建立高效液相色谱法（HPLC）在测定兔血清中百草枯浓度的可行性,并观察不同剂量 百草枯灌胃后兔血清浓度的经时变化情况。方法 12 只家兔按照随机数字表法分为两组,每组6 只,分别灌胃 给予100 mg/kg（高剂量组）和20 mg/kg（低剂量组）百草枯,于给药后1、2、5、12、24、48 及72 h 采集血 清,血清用乙腈直接沉淀蛋白处理后进行高效液相测定。色谱柱条件：流动相为0.1 mol/L 磷酸缓冲液（含 12.5 mmol/L 庚烷磺酸钠）- 乙腈（90 ︰ 10,TFA 调pH=2.8）,流速为1.0 ml/min,检测波长为258 nm,柱温为 30℃。结果 所建立的方法在0.2 ～ 100.0 mg/L 浓度范围内线性关系良好（r =0.999）。相对回收率在97.82% ～ 101.20% 之间,绝对回收率在84.37% ～ 88.80% 之间,日内和日间精密度（RSD）<5%。百草枯血药浓度时间 曲线为单峰,无论是高剂量组还是低剂量组,给药2 h 后其血清浓度达到峰值,之后逐渐下降,其中,高剂量组于 给药后72 h 后检测不出百草枯,低剂量组于药后24 h 检测不出百草枯。重复测量设计的方差分析结果显示, 不同时间点间、不同剂量组间的百草枯浓度及高、低剂量组随时间变化趋势差异有统计学意义。结论 所建 立的HPLC 方法可用于测定兔血清百草枯浓度,不同剂量百草枯兔灌胃后其血清浓度和蓄积的时间与剂量有 关,给药2 h 后血药浓度达峰值。     

原位聚合酶链反应技术检测结节性红斑皮损中Ⅱ型单纯疱疹病毒DNA

目的　探讨结节性红斑（ Ｅ Ｎ） 的发病与Ⅱ型单纯疱疹病毒（ Ｈ Ｓ Ｖ２） 的关系。方法　用原位聚合酶链反应法（ Ｉ Ｓ Ｐ Ｃ Ｒ） ,对３５ 例 Ｅ Ｎ 皮损组织及１４ 例正常皮肤组织切片中的 Ｈ Ｓ Ｖ２ Ｄ Ｎ Ａ 进行扩增, Ｓ Ｐ 免疫组化染色, Ａ Ｅ Ｃ 显色。结果　 Ｈ Ｓ Ｖ２ Ｄ Ｎ Ａ 在 Ｅ Ｎ 及正常皮肤中的检出率分别为５７ ．１ ％ （２０／３５） 、８ ．３ ％ （２／１４） , Ｐ＜ ０ ．０１ ,阳性信号主要位于皮损部位,以小血管为著,细胞内的分布以核内型为主,亦有核浆混合型。结论　 Ｅ Ｎ 的发病与 Ｈ Ｓ Ｖ２ 有关。     

A newly established murine immature dendritic cell line can be differentiated into a mature state, but exerts tolerogenic function upon maturation in the presence of glucocorticoid

The phenotype and function of murine dendritic cells (DCs) are primarily studied using bone-marrow-derived DCs (BM-DCs), but may be hampered by the heterogeneous phenotype of BM-DCs due to their differential state of maturation. Here we characterize a newly established murine DC line (SP37A3) of myeloid origin. During maintainance in the presence of granulocyte-macrophage colony-stimulating factor (GM-CSF) and M-CSF, SP37A3 cells resemble immature DCs characterized by low expression of major histocompatibility complex (MHC) II and costimulatory molecules and low T-cell stimulatory capacity. Upon stimulation, SP37A3 cells acquire a mature phenotype and activate naive T cells as potently as BM-DCs. Similar to BM-DCs, SP37A3 cells activated in the presence of dexamethasone-induced regulatory T cells, which were anergic upon restimulation and suppressed proliferation of naive T cells. This tolerogenic state was reflected by lower expression levels of costimulatory molecules and proinflammatory cytokines compared with mature cells, as well as up-regulated expression of FcgammaRIIB and interleukin-1RA (IL-1RA). SP37A3 cells were responsive to dexamethasone even when applied at later time points during activation, suggesting functional plasticity. Thus, DC line SP37A3 represents a suitable model to study functions of immature and mature as well as tolerogenic myeloid DCs, circumventing restrictions associated with the use of primary DCs and BM-DCs.     

基于系统动力学的我国执业(助理)医师需求预测模型研究

目的:以我国执业(助理)医师队伍为研究对象,对我国医师需求系统进行系统动力学预测模型构建,并预测2023—2035年我国执业(助理)医师的需求数量,进而提出推进执业(助理)医师合理配置的政策建议。方法:通过整理相关领域研究成果,总结执业(助理)医师的需求数量影响因素,绘制因果关系图和流图,建立模型的动态反馈结构,利用MATLAB软件选取GM(1,1)灰色模型法、样条插补法、曲线拟合法、移动平均预测法对模型中的需求关键因素进行参数估计。结果:通过文献资料分析发现,执业(助理)医师数量的影响因素主要包括经济、社会、人口、机构4大类因素。本研究构建的系统动力学模型包括1个存量、2个流量、21个辅助变量,执业(助理)医师存量的历史性检验结果显示,2011—2020年该指标的平均绝对百分比误差为1.911。2023—2035年我国执业(助理)医师存量将从440.025万人增长到563.073万人,千人口执业(助理)医师数量从3.08人上升到4.02人,执业(助理)医师需求数量将从481.532万人增长到469.109万人,千人口执业(助理)医师需求数量从3.22人上升到4.64人。结论:以历史数...     

The Effect of Initial Patient Experiences and Life Stressors on Predicting Lost to Follow-Up in Patients New to an HIV Clinic

AIDS and Behavior - We conducted a prospective cohort study of 450 patients new to an HIV clinic in Houston, TX, to examine the roles of life stressors and initial care experiences in predicting...