Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 857

会议视频 57

会议信息 1

年份

2024 4

2023 117

2022 162

2021 153

2020 81

2019 40

2018 25

2017 23

2016 40

2015 35

2014 35

2013 23

2012 28

2011 15

2010 22

2009 29

2008 25

2007 22

2006 5

2005 2

展开︾

关键词

医学 6

经济 5

GM(1 4

人工智能 4

智能工业 4

环境 4

能源 4

化工 3

医院中子照射器I型堆 3

抗生素 3

1)模型 2

Engineering期刊工作 2

MCNP 2

中子通量密度 2

代谢 2

优化 2

信息素 2

冶金 2

医院中子照射器 2

展开︾

检索范围：

排序：展示方式：

八步连续流全合成维生素B₁工艺研究 Article

姜梅芬, 刘敏杰, 李伟剑, 夏应奇, 陈芬儿

《工程（英文）》 2024年第32卷第1期页码 230-239 doi: 10.1016/j.eng.2023.01.016

摘要：

维生素B₁作为一种抗利尿和抗氧化剂被广泛应用于医疗保健和食品行业，以维持神经传导、心脏和胃肠道的正常功能。本研究报道了由市售2-氰基乙酰胺进行的维生素B₁的八步连续流全合成工艺。维生素B1全合成的连续流工艺总停留时间约为3.5小时，产品纯度高，分离产率为47.7%。该八步连续流动技术方案至少涉及绿色化学的六个关键准则。

关键词：维生素B1 连续流合成微反应器连续制造

HTML PDF 收藏

Loss of liver kinase B1 causes planar polarity defects in cochlear hair cells in mice

null

《医学前沿（英文）》 2016年第10卷第4期页码 481-489 doi: 10.1007/s11684-016-0494-3

摘要：

The tumor suppressor gene liver kinase B1 (LKB1), also called STK11, encodes a serine/threonine kinase. LKB1 plays crucial roles in cell differentiation, proliferation, and polarity. In this study, LKB1 conditional knockout mice (LKB1^Pax2 CKO mice) were generated using Pax2-Cre mice to investigate the function of LKB1 in inner ear hair cells during early embryonic period. LKB1^Pax2 CKO mice died perinatally. Immunofluorescence and scanning electron microscopy revealed that stereociliary bundles in LKB1^Pax2 CKO mice were clustered and misoriented, respectively. Moreover, ectopic distribution of kinocilium bundles resulting from abnormal migration of kinocilium was observed in the mutant mice. The orientation of stereociliary bundles and the migration of kinocilia are critical indicators of planar cell polarity (PCP) of hair cells. LKB1 deficiency in LKB1^Pax2 CKO mice thus disrupted hair cell planar polarity during embryonic development. Our results suggest that LKB1 is required in PCP formation in cochlear hair cells in mice.

关键词： LKB1 stereociliary bundles kinocilium planar cell polarity hearing mice

HTML PDF 收藏

Ultraviolet-B induced expression of hypoxia-inducible factor 1α, transferrin receptor through EGFR/PI3K/AKT/DEC1 pathway

LI Yanhua, BI Zhigang

《医学前沿（英文）》 2007年第1卷第1期页码 79-86 doi: 10.1007/s11684-007-0016-4

摘要： The aim of this research was to explore the effects and signaling pathway of ultraviolet-B (UVB) irradiation on the expression of hypoxia-inducible factor 1α (HIF-1α) and transferrin receptor (TfR). HIF-1α protein was measured by Western blot method. Expressions of epidermal growth factor receptor (EGFR), phosphor-EGF-R and TfR after UVB irradiation were determined with flow cytometry. After UVB irradiation, mRNA levels of HIF-1α and TfR were detected by real time-PCR. Results showed that compared with control groups, UVB was able to induce HIF1α and TfR protein expression in a dose- and time-dependent manner in HaCat cells (<0.05). TfR mRNA was expressed in a dose-dependent manner and reached a peak at the 8th hour in HaCat cells (<0.05) whereas HIF-1α mRNA expression was not affected by UVB treatment (>0.05). The EGFR/PI3K/AKT signaling pathway was required for the induction of HIF-1α and TfR expression induced by UVB. UVB induced activation of EGFR in HaCat cells and EGFR regulated expression of TfR and HIF-1α. EGFR (-/-) MEF did not increase the HIF1 expression following UVB irradiation (>0.05). In contrast, EGFR (+/+) MEF strongly enhanced HIF1α expression after UVB irradiation (<0.05). PD153035, a selective inhibitor of EGFR tyrosine kinase, inhibited the TfR protein expression in UVB-treated cells in a dose-dependent manner (P<0.05). PI3K inhibitors, LY294002 and wortmannin, inhibited HIF-1? and TfR expressions induced by UVB (P<0.05). The DEC1 (-/-) Ha-Cat cells did not increase their TfR and HIF-1α expressions following UVB irradiation (>0.05). In contrast, DEC1 (+/+) HaCat cells strongly enhanced TfR and HIF-1? protein expression after UVB irradiation (P<0.05). We conclude that UVB induces TfR and HIF-1αexpressions via EGFR/PI3K/AKT/DEC1 signaling pathway.

HTML PDF 收藏

基于数字信息素和领航算法的未知环境多智能体目标探测 Research

邵燕1,赵志峰1,2,李荣鹏1,周裕庚3

《信息与电子工程前沿（英文）》 2020年第21卷第5期页码 649-808 doi: 10.1631/FITEE.1900659

摘要：基于数字信息素和当前主流无人系统控制算法，提出一种有限先验知识下多无人机系统目标探测分布式算法。通过改进不同语义数字信息素的融合算法和个体行为决策方案，提出一种更合理、有效的信息素更新机制。此外，使用矢量信息代替传统标量信息素，使无人机群具有更高探测效率。仿真结果表明，该算法在指定区域的探测覆盖率、目标获取及回访效率、避障能力等方面都有较好表现。

关键词：群体智能；数字信息素；人工势场；领航算法

HTML PDF 收藏

Superenhancers activate the autophagy-related genes Beclin1 and LC3B to drive metastasis and drug resistance

《医学前沿（英文）》 2022年第16卷第6期页码 883-895 doi: 10.1007/s11684-022-0919-0

摘要： Metastasis and drug resistance are the leading causes of poor prognosis in patients with osteosarcoma. Identifying the relevant factors that drive metastasis and drug resistance is the key to improving the therapeutic outcome of osteosarcoma. Here, we reported that autophagy was highly activated in metastatic osteosarcoma. We found increased autophagolysosomes in metastatic osteosarcoma cell lines by using electron microscopy, Western blot, and immunofluorescence experiments. We further examined the expression of the autophagy-related genes Beclin1 and LC3B in 82 patients through immunohistochemistry and found that Beclin1 and LC3B were highly related to unfavorable prognosis of osteosarcoma. Knockdown of Beclin1 and LC3B reduced invasion, metastasis, and proliferation in metastatic osteosarcoma cells. In vitro and in vivo studies also demonstrated that inhibiting by 3-MA inhibited cell growth and metastasis. Moreover, we demonstrated that autophagy-related genes were activated by SEs and that the inhibition of SEs by JQ-1 decreased the metastasis of osteosarcoma. Overall, our findings highlighted the association of autophagy with osteosarcoma progression and shed new light on autophagy-targeting therapy for osteosarcoma.

关键词： osteosarcoma autophagy metastasis drug resistance Beclin1 LC3B

HTML PDF 收藏

Gene therapy for hemophilia B mice with scAAV8-LP1-hFIX

null

《医学前沿（英文）》 2016年第10卷第2期页码 212-218 doi: 10.1007/s11684-016-0438-y

摘要：

Hemophilia B is a hemorrhagic disease caused by the deficiency of clotting factor IX (FIX). Gene therapy might be the ultimate strategy for the disease. However, two main problems that should be solved in gene therapy for hemophilia B are immunity and safety. Self-complementary adeno-associated virus serotype 8 (scAAV8), a non-human primate AAV featuring low immunogenicity and high transfection efficiency in liver cells, might be a potential vector for hemophilia B gene therapy. A strong liver-specific promoter-1 (LP1) was inserted and mutant human FIX Arg338Ala was introduced into plasmid scAAV8-LP1 to develop an optimized AAV8 vector that expresses human clotting factor FIX (hFIX). The efficiency of scAAV8-LP1-hFIX administered through normal systemic injection or hydrodynamic injection was compared. A high expression was achieved using hydrodynamic injection, and the peak hFIX expression levels in the 5×10¹¹ and 1×10¹¹virus genome (vg) cohorts were 31.94% and 25.02% of normal level, respectively, at 60 days post-injection. From the perspective of long-term (200 days) expression, both injection methods presented promising results with the concentration value maintained above 4% of normal plasma. The results were further verified by enzyme-linked immunosorbent assay and activated partial thromboplastin time. Our study provides a potential gene therapy method for hemophilia B.

关键词： hemophilia B AAV8 hFIX gene therapy

HTML PDF 收藏

Association of miRNA-122-binding site polymorphism at the interleukin-1 α gene and its interaction withhepatitis B virus mutations with hepatocellular carcinoma risk

null

《医学前沿（英文）》 2014年第8卷第2期页码 217-226 doi: 10.1007/s11684-014-0326-2

摘要：

This study was designed to investigate the contribution of miRNA-122-binding site polymorphism at the IL-1A gene and its multiplicative interactions with hepatitis B virus (HBV) mutations in the risk of hepatocellular carcinoma (HCC). A total of 1021 healthy controls, 302 HBV surface antigen (HBsAg) seroclearance subjects, and 2011 HBsAg-positive subjects (including 1021 HCC patients) were enrolled in this study. Quantitative PCR was used to genotype rs3783553. HBV mutations were determined by direct sequencing. Multivariate logistic regression analyses were performed to test the associations of rs3783553, mutations, and their interactions with the risk of HCC. No significant association was found between rs3783553 and the risk of HCC among healthy controls, HBsAg seroclearance subjects, HBsAg-positive subjects without HCC, and all controls. Additionally, rs3783553 was not significantly associated with chronic HBV infection, liver cirrhosis, HBV e antigen seroconversion, abnormal alanine aminotransferase, and high viral load (>10⁴ copies/ml). However, the TTCA insertion allele of rs3783553 was significantly associated with an increased frequency of HBV C7A mutation compared with homozygous TTCA deletion carriers [(del/ins+ ins/ins) vs. del/del, adjusted odds ratio (OR)=1.48, 95% confidence interval (CI)=1.09-2.02, P=0.013]. Multiplicative interaction of rs3783553 with HBV preS deletion significantly reduced the risk of HCC in males, with an adjusted OR of 0.64 (95% CI=0.42-0.98; P=0.041) after age and HBV genotype were adjusted. Although rs3783553 did not significantly affect genetic susceptibility to HBV-related HCC, its variant allele may predispose the host to selecting HBV C7A mutation during evolution and significantly reduce the risk of HCC caused by HBV preS deletion. This study provides an insight into the complex host-virus interaction in HBV-induced hepatocarcinogenesis and is helpful in determining HBsAg-positive subjects who are likely to develop HCC.

关键词： hepatocellular carcinoma (HCC) interaction miRNA-122-binding site IL-1A rs3783553 hepatitis B virus (HBV) mutations

HTML PDF 收藏

Netrin-1 works with UNC5B to regulate angiogenesis in diabetic kidney disease

Xiaojing Jiao, Dong Zhang, Quan Hong, Lei Yan, Qiuxia Han, Fengmin Shao, Guangyan Cai, Xiangmei Chen, Hanyu Zhu

《医学前沿（英文）》 2020年第14卷第3期页码 293-304 doi: 10.1007/s11684-019-0715-7

摘要： Netrin-1, an axon guidance factor, and its receptor UNC5B play important roles in axonal development and angiogenesis. This study examined netrin-1 and UNC5B expression in kidneys with diabetic kidney disease (DKD) and investigated their roles in angiogenesis. Netrin-1 and UNC5B were upregulated in streptozotocin-induced DKD Wistar rats, and their expression was compared with that in healthy controls. However, exogenous netrin-1 in UNC5B-depleted human renal glomerular endothelial cells (HRGECs) inhibited cell migration and tubulogenesis. This effect was likely associated with SRC pathway deactivation. Netrin-1 treatment also eliminated the pro-angiogenic effects of exogenous VEGF-165 on UNC5B-silenced HRGECs. These results indicate that UNC5B antagonizes netrin-1 and that UNC5B upregulation contributes partly to enhancing angiogenesis in DKD. Therefore, introducing exogenous netrin-1 and depleting endogenous UNC5B are potential strategies for reducing the incidence of early angiogenesis and mitigating kidney injury in DKD.

关键词： netrin-1 VEGF-165 UNC5B angiogenesis diabetic kidney disease

HTML PDF 收藏

Molecular characterization of two suppressor of cytokine signaling 1 genes (

Xue XU,Jiannan ZHANG,Juan LI,Yajun WANG

《农业科学与工程前沿（英文）》 2015年第2卷第1期页码 73-83 doi: 10.15302/J-FASE-2015044

摘要： Suppressor of cytokine signaling 1 (SOCS1) protein can inhibit the signal transduction triggered by some cytokines or hormones and thus are important in many physiological/pathological processes, including innate and adaptive immunity, inflammation, and development in mammals. However, there is sparse information about their structure, tissue expression, in birds, where their biological functions remain unknown. In this study, we cloned and characterized two genes (named and ) from chickens. is predicted to encode a 207-amino acid protein, which shares high amino acid sequence identity (64%–67%) with human and mouse SOCS1. Besides , a novel gene was also identified in chickens and other non-mammalian vertebrates including . Chicken is predicted to encode a 212-amino acid protein, which shares only 30%–32% amino acid sequence identity with human SOCS1 and cSOCS1a. RT-PCR assay revealed that both and are widely expressed in all chicken tissues. Using a luciferase reporter assay system, we further demonstrated that transient expression of and can significantly inhibit chicken growth hormone (GH)- or prolactin (PRL)-induced luciferase activities of Hep G2 cells expressing cGH receptor (or cPRL receptor), indicating that SOCS1a and SOCS1b proteins can negatively regulate GH/PRL signaling. Taken together, these data suggest that both cSOCS1a and cSOCS1b may function as negative regulators of cytokine/hormone actions, such as modulation of GH/PRL actions in chickens.

关键词： chicken SOCS1a SOCS1b growth hormone prolactin

HTML PDF 收藏

左炔诺孕酮宫内释放系统对胰岛素样生长因子-1的影响与预防盆腔炎的相关性研究

吴晓杰,刘霞,陶跃平,王洁

《中国工程科学》 2015年第17卷第6期页码 4-7

摘要：

目的：研究左炔诺孕酮宫内释放系统对子宫内膜组织胰岛素样生长因子-1（IGF-1）的影响及预防盆腔炎疗效分析。分别对术前及术后6个月子宫内膜组织IGF-1的表达情况进行对比，且随访2年，了解患者盆腔炎发生情况。结果：所有手术均成功，研究组子宫内膜组织IGF-1表达术后明显低于术前，对照组术前及术后子宫内膜组织IGF-1表达变化无差异，二组相比，术后IGF-1表达差异有显著性。结论：左炔诺孕酮宫内释放系统对子宫内膜的IGF-1表达存在抑制作用，可能是其抑制子宫内膜增生并减少盆腔炎发生的机制之一。

关键词：左炔诺孕酮宫内系统；胰岛素样生长因子；盆腔炎

HTML PDF 收藏

基于双目立体匹配和B样条的三维人脸点云孔洞修补算法 Research Articles

黄源1,2,达飞鹏1,2

《信息与电子工程前沿（英文）》 2022年第23卷第3期页码 398-408 doi: 10.1631/FITEE.2000508

摘要：本文提出一种采用立体匹配技术结合B样条的孔洞修补方法。算法首先利用光栅投影过程中获取的相位信息定位点云中的孔洞区域，同时提取边界点集。再利用B样条曲线形状可由少数关键点大致描述这一特性，将控制点作为关键点放入孔洞区域进行曲面重建迭代计算。仿真使用光滑陶瓷杯和人脸模型进行，结果表明，该算法能够准确再现被测物体表面的细节和复杂形状。

关键词：三维点云；孔洞修补；立体匹配；B样条

HTML PDF 收藏

Irreversible phenotypic perturbation and functional impairment of B cells during HIV-1 infection

Jingjing Yan, Shuye Zhang, Jun Sun, Jianqing Xu, Xiaoyan Zhang

《医学前沿（英文）》 2019年第13卷第3期页码 409-409 doi: 10.1007/s11684-018-0618-z

HTML PDF 收藏

从H1N1血凝素序列提取的沙门氏菌传递的COBRA-HA1抗原对甲型流感亚型产生广谱保护作用 Article

Ram Prasad Aganja, Amal Senevirathne, Chandran Sivasankar, John Hwa Lee

《工程（英文）》 2024年第32卷第1期页码 42-57 doi: 10.1016/j.eng.2023.08.001

摘要：

A universal vaccine is in high demand to address the uncertainties of antigenic drift and the reduced effectiveness of current influenza vaccines. In this study, a strategy called computationally optimized broadly reactive antigen (COBRA) was used to generate a consensus sequence of the hemagglutinin globular head portion (HA1) of influenza virus samples collected from 1918 to 2021 to trace evolutionary changes and incorporate them into the designed constructs. Constructs carrying different HA1 regions were delivered into eukaryotic cells by Salmonella-mediated bactofection using a Semliki Forest virus RdRp-dependent eukaryotic expression system, pJHL204. Recombinant protein expression was confirmed by Western blot and immunofluorescence assays. Mice immunized with the designed constructs produced a humoral response, with a significant increase in immunoglobulin G (IgG) levels, and a cell-mediated immune response, including a 1.5-fold increase in CD4⁺ and CD8⁺ T cells. Specifically, constructs #1 and #5 increased the production of interferon-γ (IFN-γ) producing CD4⁺ and CD8⁺ T cells, skewing the response toward the T helper type 1 cell (Th1) pathway. Additionally, interleukin-4 (IL-4)-producing T cells were upregulated 4-fold. Protective efficacy was demonstrated, with up to 4-fold higher production of neutralizing antibodies and a hemagglutination inhibition titer > 40 against the selected viral strains. The designed constructs conferred a broadly protective immune response, resulting in a notable reduction in viral titer and minimal inflammation in the lungs of mice challenged with the influenza A/PR8/34, A/Brisbane/59/2007, A/California/07/2009, KBPV VR-92, and NCCP 43021 strains. This discovery revolutionizes influenza vaccine design and delivery; Salmonella-mediated COBRA-HA1 is a highly effective in vivo antigen presentation strategy. This approach can effectively combat seasonal H1N1 influenza strains and potential pandemic outbreaks.

关键词： COBRA Influenza A Salmonella Vaccine Broad spectral protection

HTML PDF 收藏

Design, synthesis, and antiviral properties of 2-aryl-1H-benzimidazole-4-carboxamide derivatives

Xianjin LUO, Zhonglü ZHANG, Yutian YANG, Fei XUE, Naiyun XIU, Yuanbin SHE

《化学科学与工程前沿（英文）》 2009年第3卷第3期页码 305-309 doi: 10.1007/s11705-009-0021-z

摘要： A series of new benzimidazole derivatives were designed and synthesized. Their chemical structures were testified by H NMR, infrared spectroscopy (IR), mass spectrography (MS), and elemental analysis. Their potent antiviral properties indicated the prospect of new drugs. Compound , , , , , , and were identified as novel antivirus with much better selective activity and inhibitory activity than the comparable ribavirin against Coxsackie virus B in VERO cells.

关键词： benzimidazole coxsackie virus B₃ antiviral properties

HTML PDF 收藏

环境一号卫星A/B星数据自动几何精校正设计研究

熊文成,申文明,王桥,史园莉,肖如林,付卓

《中国工程科学》 2014年第16卷第3期页码 37-42

摘要：

环境一号卫星A/B星是我国自主研制的小卫星星座，其在轨稳定运行近5年，并稳定获取了大量高质量的观测数据，实现对这些观测数据的几何精校正处理，对发挥环境星宏观、动态的生态环境监测有着重要意义。实际运行数据表明，该方法可以较好地实现环境一号卫星各载荷数据的自动几何精校正，环境一号卫星CCD相机自动几何精校正图像精度可达到2个像素以内，同星不同载荷图像之间自动匹配方法可以获取小于1个像素的图像匹配精度

关键词：环境一号卫星自动几何精校正 CCD

HTML PDF 收藏

标题作者时间类型操作

八步连续流全合成维生素B₁工艺研究

姜梅芬, 刘敏杰, 李伟剑, 夏应奇, 陈芬儿

期刊论文

Loss of liver kinase B1 causes planar polarity defects in cochlear hair cells in mice

null

期刊论文

Ultraviolet-B induced expression of hypoxia-inducible factor 1α, transferrin receptor through EGFR/PI3K/AKT/DEC1 pathway

LI Yanhua, BI Zhigang

期刊论文

基于数字信息素和领航算法的未知环境多智能体目标探测

邵燕1,赵志峰1,2,李荣鹏1,周裕庚3

期刊论文

Superenhancers activate the autophagy-related genes Beclin1 and LC3B to drive metastasis and drug resistance

期刊论文

Gene therapy for hemophilia B mice with scAAV8-LP1-hFIX

null

期刊论文

Association of miRNA-122-binding site polymorphism at the interleukin-1 α gene and its interaction withhepatitis B virus mutations with hepatocellular carcinoma risk

null

期刊论文

Netrin-1 works with UNC5B to regulate angiogenesis in diabetic kidney disease

Xiaojing Jiao, Dong Zhang, Quan Hong, Lei Yan, Qiuxia Han, Fengmin Shao, Guangyan Cai, Xiangmei Chen, Hanyu Zhu

期刊论文

Molecular characterization of two suppressor of cytokine signaling 1 genes (

Xue XU,Jiannan ZHANG,Juan LI,Yajun WANG

期刊论文

左炔诺孕酮宫内释放系统对胰岛素样生长因子-1的影响与预防盆腔炎的相关性研究

吴晓杰,刘霞,陶跃平,王洁

期刊论文

基于双目立体匹配和B样条的三维人脸点云孔洞修补算法