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Mo2C@3D ultrathin macroporous carbon realizing efficient and stable nitrogen fixation

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Science China Chemistry 2020年第11期63卷 1570-1577页

作者： Zhiwei Fang desiree Fernandez Nana Wang Zhongchao Bai Guihua Yu Materials Science and Engineering Program Texas Materials InstituteThe University of Texas at AustinAustinTexas 78712United States Institute for Superconducting and Electronic Materials University of WollongongInnovation CampusWollongongNew South Wales 2500Australia

Ammonia is a key feedstock of fertilizers for farming and convenient hydrogen carrier as an emerging clean fuel,but industrial ammonium production process,Haber-Bosch reaction,is an energy-intensive process,consuming 1%–2%of global energy and producing 3%global *** nitrogen reduction reaction(NRR)is one of the most promising routes to realize highly efficient NH3 production under ambient ***,up to now,few precious-metal-free electrocatalysts with desirable catalytic performance have been *** this work,Mo2C nanodots anchored on three-dimensional ultrathin macroporous carbon(Mo2C@3DUM-C)framework is developed toward significantly enhanced nitrogen reduction *** to the special structural design of 3D ultrathin macroporous carbon and highly active and stable Mo2C toward N2 electrochemical reduction,the Mo2C@3DUM-C framework exhibits a high Faradaic efficiency of 9.5%for NH3 production at−0.20 V and the yield rate reaches 30.4µg h−1 mgMo2C−*** electrochemical characterizations reveal the enhanced electron transfer and increased electrochemical surface area in the 3D macroporous carbon ***,the Mo2C@3DUM-C electrocatalysts hold high catalytic stability after long-term NRR *** temperature-dependent yield rate of NH3 demonstrates that the activation energy of nitrogen reduction on the employed catalyst was calculated to be 28.1 kJ mol−*** proposed earth-abundant Mo2C@3DUM-C demonstrates an alternative insight into developing efficient and stable nitrogen fixation catalysts in acids as alternatives to noble metal catalysts.

关键词： electrocatalyst nitrogen fixation nanoparticles molybdenum macroporous carbon

A mini review on two-dimensional nanomaterial assembly

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Nano Research 2020年第5期13卷 1179-1190页

作者： Zhiwei Fang Qiyu Xing desiree Fernandez Xiao Zhang Guihua Yu Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at AustinAustinTexas 78712USA 2 School of Chemistry and Materials ScienceUniversity of Science&Technology of ChinaHefei 230026China

Two-dimensional(2D)nanomaterials have attracted a great deal of attention since the discovery of graphene in 2004,due to their intriguing physicochemical properties and wide-ranging applications in catalysis,energy-related devices,electronics and *** maximize the potential of 2D nanomaterials for their technological applications,controlled assembly of 2D nanobulding blocks into integrated systems is critically *** mini review summarizes the reported strategies of 2D materials-based assembly into integrated functional nanostructures,from in-situ assembly method to post-synthesis *** applications of 2D assembled integrated structures are also covered,especially in the areas of energy,electronics and sensing,and we conclude with discussion on the remaining challenges and potential directions in this emerging field.

关键词： two-dimensional materials assembly self-assembly post-synthesis assembly integrated nanostructures

Simulating bed evolution following the Barlin Dam(Taiwan,China)failure with implications for sediment dynamics modeling of dam removal

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International Journal of Sediment Research 2016年第4期31卷 299-310页

作者： Hsiao-Wen Wang desiree Tullos Wei-Cheng Kuo Department of Hydraulic and Ocean Engineering National Cheng Kung University Department of Biological and Ecological Engineering Oregon State University

The failure of the Barlin Dam in Taiwan,China offers an important case study for evaluating concepts in modeling the rapid erosion and channel recovery following intentional and unplanned dam *** present a modeling effort that applied a 1D and quasi-2D uncoupled hydraulics and sediment model(NETSTARS) to evaluate how discretization and parameterization influence thefitofbed elevationpredictions to observations following dam *** analysis evaluated the model sensitivity to sediment transport function,active layer thickness,and number of stream tubes used to define the *** indicate that a) the model is more sensitive to active layer thickness and sediment transport function than to the number of stream tubes,b) development of dam removal models are likely to benefit from varying the active layer thickness in time,and c) increased lateral discretization does not appear to improve model fit in the steep and rapidly changing river environment at our *** conclude with discussion on differences between,identifying the need for,and general use of 1D,quasi-2D,and fully 2D models in dam removal and failure analysis.

关键词： Dam removal Modeling Sediment dynamics Channel evolution Taiwan,China

新型冠状病毒感染康复期IgG抗体水平及疫苗接种关系

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国际呼吸杂志 2024年第1期44卷 79-84页

作者：安树昌刘国田黄新 AGBO Sedine Marie desiree Nina 逄晓莉李兵蔡善花顾红岩刘晓一崔蓉清华大学第一附属医院呼吸与危重症医学科北京100016 清华大学医学院北京100084 清华大学第一附属医院检验科北京100016

目的了解新型冠状病毒感染(COVID-19)康复期IgG抗体水平及其与新型冠状病毒疫苗接种的关系。方法本研究为前瞻性队列研究。采用非随机抽样的方法,选取2023年2月至5月在清华大学第一附属医院呼吸与危重症医学科门诊和病房就诊的185例COVI... 详细信息

目的了解新型冠状病毒感染(COVID-19)康复期IgG抗体水平及其与新型冠状病毒疫苗接种的关系。方法本研究为前瞻性队列研究。采用非随机抽样的方法,选取2023年2月至5月在清华大学第一附属医院呼吸与危重症医学科门诊和病房就诊的185例COVID-19康复者为研究对象。记录患者一般资料、发病时间、病情严重程度、接种新型冠状病毒疫苗情况。收集患者感染后6、8、10、12、14、16、18周不同时间点静脉血,采用半定量磁微粒化学发光法检测血清免疫球蛋白(Ig)G、IgM抗体水平。按照新型冠状病毒疫苗接种情况分为疫苗接种组(接种2剂次以上灭活疫苗,共130例)和疫苗未接种组(因各种原因未能接种疫苗,共55例)。将2组中>75岁康复者分别纳入亚组,疫苗接种亚组(18例)和疫苗未接种亚组(28例)。比较康复者整体、2组和2亚组各时间点的IgG、IgM抗体水平。结果185例COVID-19康复者中男80例,女105例;年龄62.0(40.5,75.0)岁;111例(60.00%)合并基础病。2组患者的性别比较差异无统计学意义(χ^(2)=0.03,P=0.874);疫苗未接种组年龄、合并基础病、重症或危重症比例均较疫苗接种组高,差异均有统计学意义(均P0.05);疫苗未接种亚组合并基础病比例较疫苗接种亚组高,差异有统计学意义(χ^(2)=4.30,P=0.038)。全体康复者体内IgM抗体水平均为阴性。康复者整体IgG抗体水平在感染后第10周达到峰值,之后逐渐下降,于随访期末达最低值。疫苗接种组感染后第6、8、10、12、14、16、18周的IgG抗体水平均高于疫苗未接种组,差异均有统计学意义[157.9(73.4,240.0)比4.7(1.7,17.7),Z=2.36;132.0(75.3,213.1)比2.8(0.7,52.6),Z=3.77;137.7(79.9,227.0)比1.1(0.4,15.2),Z=4.51;134.5(81.4,211.9)比1.0(0.5,2.9),Z=3.49;92.4(68.9,112.9)比1.7(1.2,2.4),Z=2.84;61.2(33.3,108.7)比2.9(1.3,12.8),Z=3.45;57.1(32.7,87.6)比1.1(0.8,8.3),Z=4.06;均P<0.05]。疫苗接种亚组感染后第8、12、16周的IgG抗体水平均高于疫苗未接种亚组,差异均有统计学意义[261.5(225.4,304.9)比13.8(0.5,126.8),Z=2.34;134.5(104.8,283.6)比1.2(0.5,2.9),Z=2.74;61.5(10.9,147.8)比1.9(1.2,27.4),Z=2.11;均P<0.05]。结论随着康复期延长,COVID-19康复者体内IgG抗体水平在达峰后逐渐下降。完成全程新型冠状病毒疫苗接种人群在患COVID-19后较未接种人群体内能产生更高水平的IgG抗体。

关键词：新型冠状病毒感染新型冠状病毒 IgG抗体疫苗接种

Denoising Letter Images from Scanned Invoices Using Stacked Autoencoders

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Computers, Materials & Continua 2022年第4期71卷 1371-1386页

作者： Samah Ibrahim Alshathri desiree Juby Vincent V.S.Hari Department of Information Technology College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia Department of Electronics College of Engineering ChengannurKerala Technological UniversityChengannur689121India

Invoice document digitization is crucial for efficient management in *** scanned invoice image is often noisy due to various *** affects the OCR(optical character recognition)detection *** this paper,letter data obtained from images of invoices are denoised using a modified autoencoder based deep learning method.A stacked denoising autoencoder(SDAE)is implemented with two hidden layers each in encoder network and decoder *** order to capture the most salient features of training samples,a undercomplete autoencoder is designed with non-linear encoder and decoder *** autoencoder is regularized for denoising application using a combined loss function which considers both mean square error and binary cross entropy.A dataset consisting of 59,119 letter images,which contains both English alphabets(upper and lower case)and numbers(0 to 9)is prepared from many scanned invoices images and windows true type(.ttf)files,are used for training the neural *** is analyzed in terms of Signal to Noise Ratio(SNR),Peak Signal to Noise Ratio(PSNR),Structural Similarity Index(SSIM)and Universal Image Quality Index(UQI)and compared with other filtering techniques like Nonlocal Means filter,Anisotropic diffusion filter,Gaussian filters and Mean *** performance of proposed SDAE is compared with existing SDAE with single loss function in terms of SNR and PSNR *** show the superior performance of proposed SDAE method.

关键词： Stacked denoising autoencoder(SDAE) optical character recognition(OCR) signal to noise ratio(SNR) universal image quality index(UQ1)and structural similarity index(SSIM)

A tight junction between E-Cadherin and the prostate Lumor suppressor SPDEF

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Asian Journal of Andrology 2013年第4期15卷 449-450页

作者： Valeria Coppola desiree Bonci Department of Hematology Oncology and MolecularMedicine Istituto Superiore di Sanita Rome 00161 Italy

Mounting evidence is highlighting the role of the ETS factor SPDEF asa prostate tumor suppressor. In a recent paper by Pal et al., SPDEF was found to transcriptionally control the expression of ECadherin, an adhesion molecule with a crucial role in preventing metastatic spread. Prostate cancer is the second leading cause of cancer death in men. Thanks to the advent of prostatespecific antigen testing in the 1980s, many patients now present with the earliest and most curable form of the disease. Despite this fact, a nonnegligible fraction of them experiences metastatic recurrence, which is ultimately responsible for patients＇ death. The recent approval of new agents including abiraterone acetate, cabazitaxel, sipuleucdT and denosumab has significantly enriched the therapeutic opportunities for advanced prostate cancer.1 However, in order to improve future drug development and patient management, a deeper elucidation of the mechanisms of metastasis formation is of utmost importance, and surrogate bio markers able to distinguish aggressive from indolent cancers are urgently needed. The prostatederived ETS factor SPDEF （alias PDEF or hPSE） is the latest discovered member of the ETS family, a large family of 27 transcription factors sharing a conserved DNAbinding domain and involved in nor mal and pathological processes by activation or repression of a multitude of target genes.2 ETS family members have major roles in tumorigenesis, especially in prostate cancer where some of them like ERG, ETV1 and ETV4 are involved in recurrent chromosomal translocations with the prostatespecific, androgenresponsive protease TMPRSS2.3 Originally described as a prostate specific mRNA transcript, SPDEF expression is actually highly restricted to epithelial cells and has been found also in breast, colon, ovary, gas tric, and airway epithelium. SPDEF loss dur ing tumor progression has been documented in prostate, breast, ovarian and colon cancer.4 Very recently, analysis of SPDEF levels

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Functional states of resident vascular stem cells and vascular remodeling

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Frontiers in Biology 2015年第5期10卷 387-397页

作者： desiree F. Leach Mitzi Nagarkatti Prakash Nagarkatti Taixing Cui Department of Cell Biology and Anatomy University of South Carolina School of Medicine Columbia SC 29209 USA Department of Pathology Microbiology and Immunology University of South Carolina School of Medicine Columbia SC 29209 USA

Recent evidence indicates that different types of vascular stem cells （VSCs） reside within the mural layers of arteries and veins. The precise identities of these resident VSCs are still unclear; generally, postnatal vasculature contains multilineage stem cells and vascular cell lineage-specific progenitor/stem cells which may participate in both vascular repair and lesion formation. However, the underlying mechanism remains poorly understood. In this review, we summarize the potential molecular mechanisms, which may control the quiescence and activation of resident VSCs and highlight a notion that the differential states of resident VSCs are directly linked to vascular repair or lesion formation.

关键词： vascular stem cell quiescence activation remodeling

Taste responsiveness to two steviol glycosides in three species of nonhuman primates

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Current Zoology 2018年第1期64卷 63-68页

作者： Sandra NICKLASSON desiree SJOSTROM Mats AMUNDIN Daniel ROTH Laura Teresa HERNANDEZ SALAZAR iatthias LASKA IFM Biology Linkoping University Linkoping SE-581 83 Kolmarden Wildlife Park Kolmarden SE-681 92 Boras Zoo Boras SE-501 13 Sweden Instituto de Neuro-Etologia Universidad Veracruzana Xalapa Veracruz C.P. 91000 Mexico

Primates have been found to differ widely in their taste perception and studies suggest that a coevolution between plant species bearing a certain taste substance and primate species feeding on these plants may contribute to such between-species differences. Considering that only platyrrhine primates, but not catarrhine or prosimian primates, share an evolutionary history with the neotrop- ical plant Stevia rebaudiana, we assessed whether members of these three primate taxa differ in their ability to perceive and/or in their sensitivity to its two quantitatively predominant sweet- tasting substances. We found that not only neotropical black-handed spider monkeys, but also paleotropical black-and-white ruffed lemurs and Western chimpanzees are clearly able to perceive stevioside and rebaudioside A. Using a two-bottle preference test of short duration, we found that Ateles geoffroyi preferred concentrations as low as 0.05 mM stevioside and 0.01 mM rebaudioside A over tap water. Taste preference thresholds of Pan troglodytes were similar to those of the spider monkeys, with 0.05 mM for stevioside and 0.03 mM for rebaudioside A, whereas Varecia variegata was slightly less sensitive with a threshold value of 0.1 mM for both substances. Thus, all three primate species are, similar to human subjects, clearly more sensitive to both steviol glycosides compared to sucrose. Only the spider monkeys displayed concentration-response curves with both stevioside and rebaudioside A which can best be described as an inverted U-shaped function sug- gesting that Ateles geoffroyi, similar to human subjects, may perceive a bitter side taste at higher concentrations of these substances. Taken together, the results of the present study do not support the notion that a co-evolution between plant and primate species may account for between-species differences in taste perception of steviol glycosides.

关键词： taste preference thresholds stevioside rebaudioside A Western chimpanzees spider monkeys black-and-white ruffed lemurs

Endocannabinoids are potential inhibitors of glioblastoma multiforme proliferation

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Journal of Integrative Medicine 2023年第2期21卷 120-129页

作者： Ashraf Duzan desiree Reinken Timothy L.McGomery Nicholas M.Ferencz Jacob M.Plummer Mufeed M.Basti School of Pharmacy Wingate UniversityWingateNC 28174USA Applied Science and Technology Department North Carolina State University of Agriculture and TechnologyGreensboroNC 27411USA College of Nursing University of Colorado Anschutz Medical CampusAuroraCO 80045USA Collage of Arts and Science Department of Chemistry and PhysicsWingate UniversityWingateNC 28174USA

Globally,it is evident that glioblastoma multiforme(GBM)is an aggressive malignant cancer with a high mortality rate and no effective treatment *** is classified as the stage-four progression of a glioma tumor,and its diagnosis results in a shortened life *** options for GBM include chemotherapy,immunotherapy,surgical intervention,and conventional pharmacotherapy;however,at best,they extend the patient’s life by a maximum of 5 *** are considered incurable due to their high recurrence rate,despite various aggressive therapeutic approaches which can have many serious adverse ***,classified as endocannabinoids,offer a promising novel therapeutic approach for *** may enhance the apoptosis of GBM cells but have no effect on normal healthy neural *** promote atypical protein kinase C,deactivate fatty acid amide hydrolase enzymes,and activate transient receptor potential vanilloid 1(TRPV1)and TRPV2 to induce pro-apoptotic signaling pathways without increasing endogenous *** previous in vivo studies,endocannabinoids,chemically classified as amide formations of oleic and palmitic acids,have been shown to increase the pro-apoptotic activity of human cancer cells and inhibit cell migration and *** review focuses on the biological synthesis and pharmacology of endogenous cannabinoids for the enhancement of cancer cell apoptosis,which have potential as a novel therapy for GBM.

关键词： Glioblastoma Endocannabinoids Ceramide Apoptosis Chemotherapy Cancer