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1Anthropogenic emission inventories in China:a review显示文摘The development of reliable anthropogenic emission inventories is essential for both understanding the sources of air pollution and designing effective air-pollution-control measures in China. However, it is challenging to quantify emissions in China accurately, given the variety of contributing sources, the complexity of the technology mix and the lack of reliable measurements. Over the last two decades,tremendous efforts have been made to improve the accuracy of emission inventories, and significant improvements have been realized. More reliable statistics and survey-based data have been used to reduce the uncertainties in activity rates and technology distributions. Local emission factors and source profiles covering various sources have been measured and reported. Based on these local databases, improved emission inventory models have been developed for power plants, large industrial plants and the residential,transportation and agricultural sectors. In this paper, we review the progress that has been made in developing inventories of anthropogenic emissions in China. We first highlight the major updates that have been made to emission inventory models and the underlying data by source category. We then summarize the sector-based estimates of emissions of different species contained in current inventories. The progress that has been made in the development of model-ready emissions is also presented. Finally, we suggest future directions for further improving the accuracy of emission inventories in China.Meng Li Huan Liu Guannan Geng Chaopeng Hong Fei Liu Yu Song Dan Tong Bo Zheng Hongyang Cui Hanyang Man Qiang Zhang Kebin He 2017National Science Review2017,4,6:100
2Coding metamaterials, digital metamaterials and programmable metamaterials显示文摘Metamaterials are artificial structures that are usually described by effective medium parameters on the macroscopic scale,and these metamaterials are referred to as‘analog metamaterials’.Here,we propose‘digital metamaterials’through two steps.First,we present‘coding metamaterials’that are composed of only two types of unit cells,with 0 and p phase responses,which we name‘0’and‘1’elements,respectively.By coding‘0’and‘1’elements with controlled sequences(i.e.,1-bit coding),we can manipulate electromagnetic(EM)waves and realize different functionalities.The concept of coding metamaterials can be extended from 1-bit coding to 2-bit coding or higher.In 2-bit coding,four types of unit cells,with phase responses of 0,p/2,p,and 3p/2,are required to mimic the‘00’,‘01’,‘10’and‘11’elements,respectively.The 2-bit coding has greater freedom than 1-bit coding for controlling EM waves.Second,we propose a unique metamaterial particle that has either a‘0’or‘1’response controlled by a biased diode.Based on this particle,we present‘digital metamaterials’with unit cells that possess either a‘0’or‘1’state.Using a field-programmable gate array,we realize digital control over the digital metamaterial.By programming different coding sequences,a single digital metamaterial has the ability to manipulate EM waves in different manners,thereby realizing‘programmable metamaterials’.The above concepts and physical phenomena are confirmed through numerical simulations and experiments using metasurfaces.Tie Jun Cui Mei Qing Qi Xiang Wan Jie Zhao Qiang Cheng 2014Light(Science & Applications)2014,3,1:130
3The Tartary Buckwheat Genome Provides Insights into Rutin Biosynthesis and Abiotic Stress Tolerance显示文摘Zhang, Lijun Li, Xiuxiu Ma, Bin Gao, Qiang Du, Huilong Han, Yuanhuai Li, Yan Cao, Yinghao Qi, Ming Zhu, Yaxin Lu, Hongwei Ma, Mingchuan Liu, Longlong Zhou, Jianping Nan, Chenghu Qin, Yongjun Wang, Jun Cui, Lin Liu, Huimin Liang, Chengzhi Qiao, Zhijun 2017Molecular Plant2017,10,9:53
4Programmable time-domain digital-coding metasurface for non-linear harmonic manipulation and new wireless communication systems显示文摘Optical non-linear phenomena are typically observed in natural materials interacting with light at high intensities, and they benefit a diverse range of applications from communication to sensing. However,controlling harmonic conversion with high efficiency and flexibility remains a major issue in modern optical and radio-frequency systems. Here, we introduce a dynamic time-domain digital-coding metasurface that enables efficient manipulation of spectral harmonic distribution. By dynamically modulating the local phase of the surface reflectivity, we achieve accurate control of different harmonics in a highly programmable and dynamic fashion, enabling unusual responses, such as velocity illusion. As a relevant application, we propose and realize a novel architecture for wireless communication systems based on the time-domain digital-coding metasurface, which largely simplifies the architecture of modern communication systems, at the same time yielding excellent performance for real-time signal transmission. The presented work, from new concept to new system, opens new pathways in the application of metamaterials to practical technology.Jie Zhao Xi Yang Jun Yan Dai Qiang Cheng Xiang Li Ning Hua Qi Jun Chen Ke Guo Dong Bai Shuo Liu Shi Jin Andrea Alù Tie Jun Cui 2019National Science Review2019,6,2:46
5Limbic Encephalitis Associated with Anti-y-aminobutyric Acid B Receptor Antibodies: A Case Series from China显示文摘Hong-Zhi Guan Hai-Tao Ren Xun-Zhe Yang Qiang Lu Bin Peng Yi-Cheng Zhu Xiao-Qiu Shao Yong-Qiang Hu Dong Zhou Li-Ying Cui 2015Chinese Medical Journal2015,,22:38
6Anisotropic coding metamaterials and their powerful manipulation of differently polarized terahertz waves显示文摘Metamaterials based on effective media can be used to produce a number of unusual physical properties(for example,negative refraction and invisibility cloaking)because they can be tailored with effective medium parameters that do not occur in nature.Recently,the use of coding metamaterials has been suggested for the control of electromagnetic waves through the design of coding sequences using digital elements‘0’and‘1,'which possess opposite phase responses.Here we propose the concept of an anisotropic coding metamaterial in which the coding behaviors in different directions are dependent on the polarization status of the electromagnetic waves.We experimentally demonstrate an ultrathin and flexible polarization-controlled anisotropic coding metasurface that functions in the terahertz regime using specially designed coding elements.By encoding the elements with elaborately designed coding sequences(both 1-bit and 2-bit sequences),the x-and y-polarized waves can be anomalously reflected or independently diffused in three dimensions.The simulated far-field scattering patterns and near-field distributions are presented to illustrate the dual-functional performance of the encoded metasurface,and the results are consistent with the measured results.We further demonstrate the ability of the anisotropic coding metasurfaces to generate a beam splitter and realize simultaneous anomalous reflections and polarization conversions,thus providing powerful control of differently polarized electromagnetic waves.The proposed method enables versatile beam behaviors under orthogonal polarizations using a single metasurface and has the potential for use in the development of interesting terahertz devices.Shuo Liu Tie Jun Cui Quan Xu Di Bao Liangliang Du Xiang Wan Wen Xuan Tang Chunmei Ouyang Xiao Yang Zhou Hao Yuan Hui Feng Ma Wei Xiang Jiang Jiaguang Han Weili Zhang Qiang Cheng 2016Light(Science & Applications)2016,5,1:36
7Broadband diffusion of terahertz waves by multi-bit coding metasurfaces显示文摘The terahertz region is a special region of the electromagnetic spectrum that incorporates the advantages of both microwaves and infrared light waves.In the past decade,metamaterials with effective medium parameters or gradient phases have been studied to control terahertz waves and realize functional devices.Here,we present a new approach to manipulate terahertz waves by using coding metasurfaces that are composed of digital coding elements.We propose a general coding unit based on a Minkowski closed-loop particle that is capable of generating 1-bit coding(with two phase states of 0 and 180°),2-bit coding(with four phase states of 0,90°,180°,and 270°),and multi-bit coding elements in the terahertz frequencies by using different geometric scales.We show that multi-bit coding metasurfaces have strong abilities to control terahertz waves by designing-specific coding sequences.As an application,we demonstrate a new scattering strategy of terahertz waves—broadband and wide-angle diffusion—using a 2-bit coding metasurface with a special coding design and verify it by both numerical simulations and experiments.The presented method opens a new route to reducing the scattering of terahertz waves.Li-Hua Gao Qiang Cheng Jing Yang Shao-Jie Ma Jie Zhao Shuo Liu Hai-Bing Chen Qiong He Wei-Xiang Jiang Hui-Feng Ma Qi-Ye Wen Lan-Ju Liang Biao-Bing Jin Wei-Wei Liu Lei Zhou Jian-Quan Yao Pei-Heng Wu Tie-Jun Cui 2015Light(Science & Applications)2015,4,1:31
8Independent control of harmonic amplitudes and phases via a time-domain digital coding metasurface显示文摘Harmonic manipulations are important for applications such as wireless communications,radar detection and biological monitoring.A general approach to tailor the harmonics involves the use of additional amplifiers and phase shifters for the precise control of harmonic amplitudes and phases after the mixing process;however,this approach leads to issues of high cost and system integration.Metasurfaces composed of a periodic array of subwavelength resonators provide additional degrees of freedom to realize customized responses to incident light and highlight the possibility for nonlinear control by taking advantage of time-domain properties.Here,we designed and experimentally characterized a reflective time-domain digital coding metasurface,with independent control of the harmonic amplitude and phase.As the reflection coefficient is dynamically modulated in a predefined way,a large conversion rate is observed from the carrier signal to the harmonic components,with magnitudes and phases that can be accurately and separately engineered.In addition,by encoding the reflection phases of the meta-atoms,beam scanning for multiple harmonics can be implemented via different digital coding sequences,thus removing the need for intricate phase-shift networks.This work paves the way for efficient harmonic control for applications in communications,radar,and related areas.Jun Yan Dai Jie Zhao Qiang Cheng Tie Jun Cui 2018Light(Science & Applications)2018,7,1:29
9Progresses on microwave remote sensing of land surface parameters显示文摘Highly accurate observations at various scales on the land surface are urgently needed for the studies of many areas,such as hydrology,meteorology,and agriculture.With the rapid development of remote sensing techniques,remote sensing has had the capacity of monitoring many factors of the Earth's land surface.Especially,the space-borne microwave remote sensing systems have been widely used in the quantitative monitoring of global snow,soil moisture,and vegetation parameters with their all-weather,all-time observation capabilities and their sensitivities to the characteristics of land surface factors.Based on the electromagnetic theories and microwave radiative transfer equations,researchers have achieved great successes in the microwave remote sensing studies for different sensors in recent years.This article has systematically reviewed the progresses on five research areas including microwave theoretical modeling,microwave inversion on soil moisture,snow,vegetation and land surface temperatures.Through the further enrichment of remote sensing datasets and the development of remote sensing theories and inversion techniques,remote sensing including microwave remote sensing will play a more important role in the studies and applications of the Earth systems.SHI JianCheng DU Yang DU JinYang JIANG LingMei CHAI LinNa MAO KeBiao XU Peng NI WenJian XIONG Chuan LIU Qiang LIU ChenZhou GUO Peng CUI Qian LI YunQing CHEN Jing WANG AnQi LUO HeJia WANG YinHui 2012Science China Earth Sciences2012,55,7:24
10Wireless Communications with Programmable Metasurface:Transceiver Design and Experimental Results显示文摘Metasurfaces have drawn significant attentions due to their superior capability in tailoring electromagnetic waves with a wide frequency range, from microwave to visible light. Recently, programmable metasurfaces have demonstrated the ability of manipulating the amplitude or phase of electromagnetic waves in a programmable manner in real time, which renders them especially appealing in the applications of wireless communications. In this paper, we present the fundamental principle of applying programmable metasurface as transmitter for wireless communications. Then, we establish a prototype system of metasurface-based transmitter to conduct several experiments and measurements over the air, which practically demonstrate the feasibility of using programmable metasurfaces in future communication systems. By exploiting the dynamically controllable property of programmable metasurface, the design, implementation and experimental evaluation of the proposed metasurface-based wireless communication system are presented with the prototype, which realizes single carrier quadrature phase shift keying(QPSK) transmission over the air. In the developed prototype, the phase of the reflected electromagnetic wave of programma-ble metasurface is directly manipulated in real time according to the baseband control signal, which achieves 2.048 Mbps data transfer rate with video streaming transmission over the air. In addition, experimental result is provided to compare the performance of the proposed metasurface-based architecture against the conventional one. With the slight increase of the transmit power by 5 dB, the same bit error rate(BER) performance can be achieved as the conventional system in the absence of channel coding. Such a result is encouraging considering that the metasurface-based system has the advantages of low hardware cost and simple structure, thus leading to a promising new architecture for wireless communications.Wankai Tang Xiang Li Jun Yan Dai Shi Jin Yong Zeng Qiang Cheng Tie Jun Cui 2019China Communications2019,16,5:23
11Pathways of China's PM;air quality 2015–2060 in the context of carbon neutrality显示文摘Clean air policies in China have substantially reduced particulate matter(PM;) air pollution in recent years,primarily by curbing end-of-pipe emissions.However,reaching the level of the World Health Organization(WHO) guidelines may instead depend upon the air quality co-benefits of ambitious climate action.Here,we assess pathways of Chinese PM;air quality from 2015 to 2060 under a combination of scenarios that link global and Chinese climate mitigation pathways(i.e.global 2℃-and 1.5℃-pathways,National Determined Contributions(NDC) pledges and carbon neutrality goals) to local clean air policies.We find that China can achieve both its near-term climate goals(peak emissions) and PM;air quality annual standard(35 μg/m;) by 2030 by fulfilling its NDC pledges and continuing air pollution control policies.However,the benefits of end-of-pipe control reductions are mostly exhausted by 2030,and reducing PM;exposure of the majority of the Chinese population to below 10 μg/m;by 2060 will likely require more ambitious climate mitigation efforts such as China’ s carbon neutrality goals and global1.5℃-pathways.Our results thus highlight that China’s carbon neutrality goals will play a critical role in reducing air pollution exposure to the level of the WHO guidelines and protecting public health.Jing Cheng Dan Tong Qiang Zhang Yang Liu Yu Lei Gang Yan Liu Yan Sha Yu Ryna Yiyun Cui Leon Clarke Guannan Geng Bo Zheng Xiaoye Zhang Steven JDavis Kebin He 2021National Science Review2021,8,12:23
12Diverse modes of clonal evolution in HBV-related hepatocellular carcinoma revealed by single-cell genome sequencing显示文摘Hepatocellular 癌(HCC ) 是癌症实质词法,基因并且 phenotypic 差异。然而,我们不理解在 intratumor 异质和肿瘤的联系词法 / 组织学的特征之间的关系。用介绍 96 个肿瘤房间(30-36 各个) 和 15 个正常的肝房间(5 各个) 的单个房间的整个染色体的定序,与联系 HBV 的 HCC 从三个男病人收集了,我们证实拷贝数字变化在 hepatocarcinogenesis 早发生,但是此后在整个肿瘤仍然保持相对稳定前进。重要地,我们证明特定的 HCC 能具有 monoclonal 或 polyclonal 起源。有汇合的 multinodular 形态学的肿瘤是典型 polyclonal 肿瘤并且显示最高的 intratumor 异质。除了 mutational 和拷贝数字侧面,我们把了用导出 HBV 的外国 genomic 标记的 HCC 的同种细胞的起源。在 monoclonal HCC,所有肿瘤单身者房间展出一样的 HBV 集成,显示 HBV 集成是一个早司机事件并且在肿瘤前进期间仍然保持极其稳定。另外,我们的结果显示那两个都转移,迟了的传播并且早播种当模特儿,在 HCC 有一个角色前进。尤其是,开始的克隆传播的早 intrahepatic 导致同步 multifocal 肿瘤的形成。同时,我们在 HCC 识别了潜在的司机基因 ZNF717,它展出变化的高频率在单个房间并且人口铺平,,通过调整 IL-6/STAT3 小径行动的肿瘤 suppressor。这些调查结果热点多重不同肿瘤在 HCC 的进化机制,它为特定的处理策略建议需要。Meng Duan, Shu Zhang, Zhichao Wang, Jieyi Shi, Longzi Liu, Xiaoying Wang, Aiwu Ke, Jian Zhou, Jia Fan, Qiang Gao Junfeng Hao, Chong Li Sijia Cui Daniel L Worthley Ya Cao Ruibin Xi Xiaoming Zhang Jian Zhou, Jia Fan Qiang Gao 2018Cell Research2018,28,3:21
13The China Alzheimer Report 2022显示文摘China’s population has rapidly aged over the recent decades of social and economic development as neurodegenerative disorders have proliferated,especially Alzheimer’s disease(AD)and related dementias(ADRD).AD’s incidence rate,morbidity,and mortality have steadily increased to make it presently the fifth leading cause of death among urban and rural residents in China and magnify the resulting financial burdens on individuals,families and society.The‘Healthy China Action’plan of 2019-2030 promotes the transition from disease treatment to health maintenance for this expanding population with ADRD.This report describes related epidemiological trends,evaluates the economic burden of the disease,outlines current clinical diagnosis and treatment status and delineates existing available public health resources.More specifically,it examines the public health impact of ADRD,including prevalence,mortality,costs,usage of care,and the overall effect on caregivers and society.In addition,this special report presents technical guidance and supports for the prevention and treatment of AD,provides expertise to guide relevant governmental healthcare policy development and suggests an information platform for international exchange and cooperation.Rujing Ren Jinlei Qi Shaohui Lin Xinya Liu Peng Yin Zhihui Wang Ran Tang Jintao Wang Qiang Huang Jianping Li Xinyi Xie Yongbo Hu Shishuang Cui Yuan Zhu Xiaoping Yu Pengfei Wang Yikang Zhu Yiran Wang Yanyan Huang Yisong Hu Ying Wang Chunbo Li Maigeng Zhou Gang Wang 2022General Psychiatry2022,35,1:20
14Blocking the recruitment of naive CD4+ T cells reverses immunosuppression in breast cancer显示文摘渗入肿瘤的 Tregs 的起源,肿瘤免疫力的抑制的批评调停人,是不清楚的。这里,,我们证明在人的乳癌的渗入肿瘤的天真的 CD4 + T 房间和 Tregs 有重叠 TCR 全部剧目几乎别与传播 Tregs 重叠,建议 intratumoral Tregs 主要在 situ 而非从招募的 Tregs 从天真的 T 房间发展。而且,许多天真的 CD4 + T 房间和 Tregs 密切被相关,两个显示的穷人为乳癌病人的预后。天真的 CD4 + T 房间与许多生产 CCL18 巨噬细胞成比例遵守肿瘤片。而且,采纳地转移的人的天真的 CD4 + T 房间以一种 CCL18 依赖的方式渗入人的乳癌 orthotopic 异种皮移植。在在人性化的鼠标的人的乳癌异种皮移植,由将 PITPNM3 的表达式击倒堵住天真的 CD4 + T 房间的招募进肿瘤, CCL18 受体,显著地减少 intratumoral Tregs 并且禁止肿瘤前进。这些调查结果建议那个乳房渗入肿瘤的 Tregs 从在 situ 区分进 Tregs 的传播天真的 CD4 + T 房间的趋化性产生。由防碍 CCL18 的 PITPNM3 识别禁止天真的 CD4 + T 房间招募进肿瘤可以是为 anticancer 免疫疗法的吸引人的策略。Shicheng Su Jianyou Liao Jiang Liu Di Huang Chonghua He Fei Chen LinBing Yang Wei Wu Jianing Chen Ling Lin Yunjie Zeng Nengtai Ouyang Xiuying Cui Herui Yao Fengxi Su Jian-dong Huang Judy Lieberman Qiang Liu Erwei Song 2017Cell Research2017,27,4:19
15Laparoscopic resection of lower rectal cancer with telescopic anastomosis without abdominal incisions显示文摘AIM:To assess laparoscopic radical resection of lower rectal cancer with telescopic anastomosis through transanal resection without abdominal incisions.METHODS:From March 2010 to June 2014, 30 patients(14 men and 16 women, aged 36-78 years, mean age 59.8 years) underwent laparoscopic radical resection of lower rectal cancer with telescopic anastomosis through anus-preserving transanal resection.The tumors were 5-7 cm away from the anal margin in 24 cases, and 4 cm in six cases.In preoperative assessment, there were 21 cases of T1N0M0 and nine of T2N0M0.Through the middle approach, the sigmoid mesentery was freed at the root with an ultrasonic scalpel and the roots of the inferior mesenteric artery and vein were dissected, clamped and cut.Following the total mesorectal excision principle, the rectum was separated until the anorectal ring reached 3-5 cm from the distal end of the tumor.For perineal surgery, a ring incision was made 2 cm above the dentate line, and sharp dissection was performed submucosally towards the superior direction, until the plane of the levator ani muscle, to transect the rectum.The rectum and distal sigmoid colon were removed together from the anus, followed by a telescopic anastomosis between the full thickness of the proximal colon and the mucosa and submucosal tissue of the rectum.RESULTS:For the present cohort of 30 cases,the mean operative time was 178 min,with an average of 13 positive lymph nodes detected.One case of postoperative anastomotic leak was observed,requiring temporary colostomy,which was closed and recovered3 mo later.The postoperative pathology showed T1-T2N0M0 in 19 cases and T2N1M0 in 11 cases.Twelve months after surgery,94.4%patients achieved anal function Kirwan grade 1,indicating that their analfunction returned to normal.The patients were followed up for 1-36 mo,with an average of 23 mo.There was no local recurrence,and 17 patients survived for>3years(with a survival rate of 100%).CONCLUSION:Laparoscopic radical resection of lower rectal cancer with telescopic anastomosis through transanal resection without abdominal incisions is safe and feasible.Shi-Yong Li Gang Chen Jun-Feng Du Guang Chen Xiao-Jun Wei Wei Cui Fu-Yi Zuo Bo Yu Xing Dong Xi-Qing Ji Qiang Yuan 2015World Journal of Gastroenterology2015,21,16:19
16Effect of Rapid Cold Hardening on the Cold Tolerance of the Larvae of the Rice Stem Borer,Chilo suppressalis(Walker)显示文摘Chilo suppressalis (沃克) 的最后中间形态幼虫的冷忍耐上的快速的冷变硬的效果(RCH ) 第一次被评估。在实验室的幼虫的 RCH 的区别温度,正式就职,察觉,持续时间和程度被测试,并且过冷点(SCP ) 和水的内容和在 RCH 处理以后的幼虫的类脂化合物分别地是坚定的。结果证明幼虫的区别温度关于 -21 ° C。为 2 h 在暴露前为 2 和 4 h 暴露了到 0 或 5 ° C 到区别温度的幼虫的吝啬的幸存率比对照组(P<0.05 ) 的那些显著地高。而且,最高的幸存率为 4 h 处理在 0 ° C 以后出现在幼虫。对 RCH 为 4 h 在 0 ° C 获得的低温度的保护很快在回来上被失去到 28 ° C。RCH 幼虫的吝啬的幸存率比 non-acclimated (NACC ) 的那些显著地高幼虫和环境适应(ACC ) 幼虫当他们为 2 或 4 h (P <0.05 ) 暴露于区别温度时。而且,从 2 ~ 6 h 的 NACC, ACC, RCH 和到区别温度的 ACC + RCH 幼虫的率导致了重要衰落。SCP 的值和为 2 和 4 h 暴露了到 0 或 5 ° C 的幼虫的类脂化合物的内容没对照组与那些相比在 0.05 水平显示出重要差别。但是在幼虫的水的内容显然被减少。因此, RCH 能提高冷忍耐并且影响 C 的幼虫的部分生理、生物化学的部件,这能被结束。suppressalis,而是内在的机制需要进一步被探索。QIANG Cheng-kui DU Yu-zhou YU Ling-ya CUI Ya-dong ZHENG Fu-shan LU Ming-xing 2008Agricultural Sciences in China2008,7,3:17
17Pore-structure-mediated hierarchical SAPO-34:Facile synthesis,tunable nanostructure,and catalysis applications for the conversion of dimethyl ether into olefins显示文摘Hierarchical cross-like SAPO-34 catalysts with different pore size distributions were obtained via hydrothermal synthesis with polyethylene glycol(PEG) as the mesopore-generating agent.The hierarchical SAPO-34 molecular sieves were characterized using X-ray diffraction,scanning electron microscopy,N_2adsorption-desorption,thermogravimetric analysis,and temperature-programmed NH_3 desorption.The cross-like SAPO-34 catalysts exhibited enriched multi-porosity,and the sizes of their mesopores ranged from 10 to 50 nm.Both the mesoporous structures and morphologies of the hierarchical SAPO-34 could be further tuned through adjustments of the amount of PEG used.The as-obtained SAPO-34 showed dramatic catalytic performance in the conversion of dimethyl ether into olefins.A maximum selectivity of olefins of 96%was achieved,which was attributed to the rapid transport of the reactants and products in zeolitic micropores through mesopores.Yu Cui Qiang Zhang Jie He Yao Wang Fei Wei 2013Particuology2013,11,4:17
18Risk Assessment of Highways Affected by Debris Flows in Wenchuan Earthquake Area显示文摘Since the Wenchuan earthquake in China on May 12 th,2008,highways in earthquake-affected areas have been frequently interrupted by debris flows.We analyzed the hazard effect modes and damage processes along highways and developed three key indexes,scale of debris flows,deposits on highways and river blockage,to describe quantitatively the highway disasters.By combining the empirical methods and the actual terrain conditions,we proposed new methods to determine the value of hazard indexes.In addition,we used the economic value and resistance of highway as vulnerability assessment indexes,then determined the specific subindexes for the subgrade,bridges and culverts,and developed a way for the quantified vulnerability zoning.Moreover,we proposed the assessment and mapping methods for highway risk.The risk is described into 5 grades:extremely low risk,low risk,middle risk,high risk and extremely high risk.We applied these methods in a case study carried out on provincial highway S303 from Yingxiu Town to Wolong Town,in Wenchuan County.Analysis of debris flow risk for the whole highway,showed that the total length of highway in extremely low risk area was 28.26 km,4.83 km in low risk area,8.0 km in middle risk area,3.65 km in high risk area,and 3.06 km in extremely high risk area.The assessment results are consistent with the field survey data which reflected the disaster situation.This risk method can be used objectively to evaluate the debris-flow risk along highways,and is useful for highway reconstruction in mountainous areas suffering from active debris flows.CUI Peng XIANG Ling-zhi ZOU Qiang 2013Journal of Mountain Science2013,10,2:17
19Mechanism of counterattack of colorectal cancer cell by Fas/Fas ligand system显示文摘AIM: To determine the role of Fas/Fas ligand (FasL) in the immune escape of colon cancer cells.METHODS: Immunohistochemistry was used to observe the expression of Fas and FasL in the tissues of colon cancer patients. In situ hybridization was used to detect the localization of FasL mRNA expression in cancer tissues.Terminal deoxynucleotide transferase-mediated dUTP nick end labeling (TUNEL) assay and CD45 staining were performed to detect the apoptosis of tumor-infiltrating lymphocytes (TILs). Co-culture assays of colon cancer cells (SW480) and Jurkat cells (Fas-sensitive cells) were performed to observe the counterattack of colon cancer cells to lymphocytes.RESULTS: Of 53 cases of colon carcinomas, 23 cases(43.4%) expressed Fas which was significantly lower as compared to the normal colonic mucosa (73.3%, P<0.01),and 45 cases (84.9%) of colon carcinomas expressed FasL, whereas only two cases (3.75%) in normal mucosa expressed FasL. FasL expression in the colon cancer cells was found to be associated with increased cell death of TILs. The apoptotic rate of TIL in the FasL-positive staining regions of tumor cells was significantly higher than that in the FasL-negative staining region (54.84±2.79% vs25.73±1.98%, P<0.01). The co-culture of SW480 cells and Jurkat cells confirmed the function of FasL on the SW480 cells. The apoptotic rates of Jurkat cells were found to be related with the amount of SW480 cells.CONCLUSION: Colon cancer cells can escape the immune surveillance and killing via decreasing Fas expression, and can counterattack the immune system via increasing FasL expression. Fas/FasL can serve as potential targets for effective antitumor therapy.Qiang Zhu Ji-Yong Liu Hong-Wei Xu Chong-Mei Yang An-Zhong Zhang Yi Cui Hong-Bo Wang 2005World Journal of Gastroenterology2005,11,39:16
20Blocking FSH inhibits hepatic cholesterol biosynthesis and reduces serum cholesterol显示文摘Menopause is associated with dyslipidemia and an increased risk of cardio-cerebrovascular disease.The classic view assumes that the underlying mechanism of dyslipidemia is attributed to an insufficiency of estrogen.In addition to a decrease in estrogen, circulating follicle-stimulating hormone (FSH)levels become elevated at menopause.In this study,we find that blocking FSH reduces serum cholesterol via inhibiting hepatic cholesterol biosynthesis.First,epidemiological results show that the serum FSH levels are positively correlated with the serum total cholesterol levels,even after adjustment by considering the effects of serum estrogen,in addition,the prevalence of hypercholesterolemia is significantly higher in peri-menopausal women than that in premenopausal women.Furthermore,we generated a mouse model of FSH elevation by intraperitoneally injecting exogenous FSH into ovariectomized (OVX)mice,in which a normal level of estrogen (E2)was maintained by exogenous supplementation. Consistently,the results indicate that FSH,independent of estrogen,increases the serum cholesterol level in this mouse model. Moreover,blocking FSH signaling by anti-FSHβ antibody or ablating the FSH receptor (FSHR)gene could effectively prevent hypercholesterolemia induced by FSH injection or high-cholesterol diet feeding.Mechanistically,FSH,via binding to hepatic FSHRs, activates the Gi2α/β-arrestin-2/Akt pathway and subsequently inhibits the binding of FoxO1 with the SREBP-2 promoter,thus preventing FoxO1 from repressing SREBP-2 gene transcription.This effect,in turn,results in the upregulation of SREBP-2,which drives HMGCR nascent transcription and de novo cholesterol biosynthesis,leading to the increase of cholesterol accumulation.This study uncovers that blocking FSH signaling might be a new strategy for treating hypercholesterolemia during menopause, particularly for women in peri-menopause characterized by FSH elevation only.Yanjing Guo Meng Zhao Tao Bo Shizhan Ma Zhongshang Yuan Wenbin Chen Zhao He Xu Hou Jun Liu Zhenhai Zhang Qiang Zhu Qiangxiu Wang Xiaoyan Lin Zhongli Yang Min Cui Lu Liu Yujie Li Chunxiao Yu Xiaoyi Qi Qian Wang Haiqing Zhang Qingbo Guan Lifang Zhao Shimeng Xuan Huili Yan Yanliang Lin Li Wang Qihang Li Yongfeng Song Ling Gao Jiajun Zhao 2019Cell Research2019,29,2:16
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