A Case of Linear Exacerbation of Atopic Dermatitis with Secondary Prurigo Nodularis

Inflammatory acquired Blaschko-linear dermatoses (IABLD) are a continuous concept involving diseases such as lichen striatus, blaschkitis, and atopic dermatitis. However, atopic dermatitis that showed increase in severity along Blaschko lines is rarely reported on its own. Herein, we report a rare case of atopic dermatitis with secondary prurigo nodularis along Blaschko lines, which may be valuable in broadening the concept of IABLD. A 28-year-old male presented with multiple, pruritic, brownish nodules on the left lower extremity along Blaschko lines for 3 to 4 years. The patient had atopic dermatitis since childhood. Histopathologic findings revealed compact orthohyperkeratosis, hypergranulosis, spongiosis, and irregular acanthosis in the epidermis. Fibrosis with vertically arranged collagen fibers and perivascular lymphohistiocytic infiltration were shown in the upper dermis. We diagnosed the case as secondary prurigo nodularis along Blaschko lines, accompanied by the preceding atopic dermatitis. We hypothesized that the patient’s underlying atopic dermatitis increased in severity along Blaschko lines, and prurigo nodularis occurred due to frequent scratching. The lesions improved with topical methylprednisolone cream, oral antihistamines and intralesional triamcinolone injection.     

二氢卟吩P6-6-(N-乙基)酰胺-7,γ-二甲酯锌的合成及对吲哚美辛诱发大鼠胃溃疡的保护作用

目的：研究二氢卟吩P6－6-(N-乙基）酰胺－7，γ－二甲酯锌（I）的合成及抗胃溃疡活性。方法：蚕沙糊状叶绿素经酸，碱降解反应制得紫红素－18（Ⅲ），Ⅲ经乙胺解后重氮甲烷甲基化制得二氢卟吩P6－6－（N－乙基）酰胺－7，γ－二甲酯（II），II与醋酸锌络合制得1，以0．2％吲美辛(20mg/kg)ip大鼠制备胃溃疡模型，并测定溃疡指数和溃疡个数。结果：I的结构经UV，IR，1HNMR，FAB－MS及元素发射光谱确证，ip I 80mg/kg有极显著降低吲哚美辛诱发的大鼠溃疡指数（P＜0．01）和溃疡个数（P＜0．01），结论：I为新化合物，II的波谱数系 首次报道，I对吲哚美辛诱发的大鼠胃溃疡具有显著的保护作用。提示I是一种有开发前景的抗溃疡候选化合物，值得深入研究。     

自分泌一氧化氮在氟尿嘧啶诱导人肝癌细胞凋亡中的作用研究

目的 :观察肝细胞Bel74 0 2自分泌一氧化氮 (NO)在 5 -氟尿嘧啶 (5 FU)诱导人肝癌细胞凋亡过程中的作用 ,进一步揭示 5 FU的作用机理 ,同时寻找提高 5 FU的临床疗效的辅剂。方法 :人肝癌细胞Bel74 0 2按常规条件培养于含 10 %小牛血清的无L 精氨酸 (L Arg)的DMEM (dulbecco’smodifiedeagle’smedium)培养液中。在 5 FU作用下 ,采用免疫组化法观察诱生型一氧化氮合酶 (iNOS)的表达情况 ,并在其底物L Arg存在的前提下 ,采用酶法测定硝酸盐 /亚硝酸盐 ,反映NO的生成 ,并证明其作用。用电镜观察凋亡细胞的形态 ,流式细胞仪进行凋亡细胞的定量。用L Arg的竞争性拮抗剂L NAME(Nω nitro l argininemethylester)对研究结果进行验证。应用病理彩色图文分析系统对免疫组化结果进行光密度定量分析。采用方差分析和t检验进行统计学分析。结果 :在 5 FU的作用下 ,iNOS表达增强 ,5 FU组 (0 1687± 0 0 1968) ,对照组 (0 10 4 9± 0 0 12 66) ,P <0 0 5 ,在其底物L Arg存在的前提下 ,内源性NO的浓度为 (73 0± 10 2 ) μmol/L(P <0 0 5 ) ,有显著性提高 ;人肝癌Bel74 0 2细胞株的凋亡率显著性增高为 (17 85± 0 78) % ,细胞坏死率和残渣率显著减少分别为 (32 99± 0 83) %、(3 18± 1 0 1) %。L NAME     

Nanoscale mapping of temperature-dependent conduction in an epitaxial VO2 film grown on an Al2O3 substrate

Vanadium dioxide (VO₂) is one of the extensively studied strongly correlated oxides due to its intriguing insulator–metal transition near room temperature. In this work, we investigated temperature-dependent nanoscale conduction in an epitaxial VO₂ film grown on an Al₂O₃ substrate using conductive-atomic force microscopy (C-AFM). We observed that only the regions near the grain boundaries are conductive, producing intriguing donut patterns in C-AFM images. Such donut patterns were observed in the entire measured temperature range (300–355 K). The current values near the grain boundaries increased by approximately two orders of magnitude with an increase in the temperature, which is consistent with the macroscopic transport data. The spatially-varied conduction behavior is ascribed to the coexistence of different monoclinic phases, i.e., M1 and M2 phases, based on the results of temperature-dependent Raman spectroscopy. Furthermore, we investigated the conduction mechanism in the relatively conductive M1 phase regions at room temperature using current–voltage (I–V) spectroscopy and deep data analysis. Bayesian linear unmixing and k-means clustering showed three distinct types of conduction behavior, which classical C-AFM cannot resolve. We found that the conduction in the M1 phase regions can be explained by the Poole–Frenkel mechanism. This work provides deep insight into IMT behavior in the epitaxial VO₂ thin film at the nanoscale, especially the coexistence and evolution of the M1 and M2 phases. This work also highlights that I–V spectroscopy combined with deep data analysis is very powerful in investigating local transport in complex oxides and various material systems.

We investigated temperature-dependent nanoscale conduction in an epitaxial VO₂ film grown on an Al₂O₃ substrate using conductive-atomic force microscopy and deep data analysis.     

Down syndrome biochemical markers and screening for preeclampsia at first and second trimester: correlation with the week of onset and the severity

OBJECTIVES: To estimate the combined screening performance of first and early second trimester prenatal serum markers for Down syndrome, in screening for the development of preeclampsia, and analyze the correlation among marker levels, week of onset, and severity of the disease. METHODS: A retrospective cohort study was carried out on 32 women with preeclampsia and 3044 controls. Serum samples from these pregnancies were assayed for pregnancy-associated plasma protein-A (PAPP-A), alpha-fetoprotein (AFP), unconjugated estriol (uE3), human chorionic gonadotrophin (hCG), and inhibin-A. A likelihood ratio and the odds of being affected given a positive result (OAPR) of various combinations of markers were calculated and receiver operating characteristic (ROC) curves analysis was performed. RESULTS: In the pregnancies that subsequently developed preeclampsia, first trimester PAPP-A concentration was significantly lower and concentrations of early second trimester inhibin-A and hCG significantly elevated. Levels of early second trimester uE3 and AFP were not significantly altered. We also found that inhibin-A correlates with both onset of the disease and the severity. CONCLUSION: Down syndrome biochemical markers levels are altered in those patients who subsequently developed preeclampsia and may be a useful screening test for preeclampsia. Inhibin-A is the most predictive marker and correlates with the severity of subsequent preeclampsia and inversely with the week of occurrence of preeclampsia.     

Three-vessel view of the fetal heart: in utero development of the great vessels

OBJECTIVES: The purpose of our study is to provide reference values for the great vessels obtained from images of the three-vessel view of the fetal heart, with an emphasis on the size discrepancy of the great vessels. METHODS: From February 2003 to May 2003, the main pulmonary artery (MPA), ascending aorta (AA), and SVC were measured in well-dated, nonanomalous fetuses scanned at 14-38 weeks of gestation. RESULTS: The size of each great vessel had a significant positive relationship with advance in gestation (P < 0.001); MPA (mm) = -2.76 + 0.34 x GA, ascending aorta (AA) (mm) = -1.73 + 0.26 x GA - 1.18E - 05 x GA(3), and SVC (mm) = 0.33 + 0.01 x GA(2) - 4.12E - 05 x GA(3). The AA/MPA ratio was significantly decreased with advance in gestation, while the SVC/AA ratio was significantly increased; AA/MPA ratio = -1.24 - 0.03 x GA + 3.88E - 04 x GA(2); P < 0.001, SVC/AA ratio = 0.63 - 5.43E - 03 x GA + 1.96E - 04 x GA(2); P < 0.001. CONCLUSION: On the three-vessel view of the fetal heart, the interpretation of the size discrepancy of the great vessels needs to be adjusted according to fetal growth.