资源类型

期刊论文 8

年份

2021 2

2018 1

2017 1

2015 1

2014 1

2010 1

2009 1

展开 ︾

关键词

易位 1

生物标志物 1

结直肠癌 1

肠腔共生菌 1

菌群 1

展开 ︾

检索范围：

排序： 展示方式：

Modeling and simulation of droplet translocation and fission by electrowetting-on-dielectrics (EWOD)

Nathan HOWELL, Weihua LI

《机械工程前沿（英文）》 2010年 第5卷 第4期   页码 376-388 doi: 10.1007/s11465-010-0104-z

摘要： This paper discusses methods of microfluidic droplet actuation by means of electrowetting-on-dielectrics (EWOD) and provides a technique for modeling and simulating a microfluidic device by using the computational fluid dynamics (CFD) program, Flow3D. Digital or droplet microfluidics implies the manipulation of droplets on a scale of nanoliters (10 L) to femtoliters (10 L), as opposed to continuous microfluidics that involve the control of continuous fluid within a channel. The two operations in focus here are droplet translocation (moving) and droplet fission (splitting), in which the pressures and velocities within the droplet are analyzed and compared to existing works, both theoretical and experimental. The variation in the pressure of the leading and trailing faces of a droplet indicates the variation in surface energy—an important parameter that explains how a droplet will move toward a region of higher electric potential. The higher voltage on one side of a droplet reduces surface energy, which leads to an induced pressure drop, thus resulting in fluid motion. Flow3D simulations are for both water and blood droplets at voltages between 50 V and 200 V, and the droplet size, surface properties (Teflon coated), and geometry of the system are kept constant for each operation. Some peculiarities of the simulation are brought to light, such as instabilities of the system to higher voltages and fluids with higher dielectric constants, as well as the creation of a tertiary droplet when the applied voltage causes a large enough force during fission. The force distribution across the droplet provides a general understanding of the electrowetting effect and more specifically allows for a comparison between the effects that different voltages have on the forces at the droplet surface. The droplet position and mean kinetic energy of the droplet are also investigated and compared to other works, proving the dynamics of a droplet motion found here.

关键词： electrowetting-on-dielectrics (EWOD)     electrowetting     microfluidics     droplet translocation     droplet fission     Flow3D     dielectric constant    

HTML PDF 收藏

Translocation and biotoxicity of metal (oxide) nanoparticles in the wetland-plant system

《环境科学与工程前沿（英文）》 2021年 第15卷 第6期 doi: 10.1007/s11783-021-1432-4

摘要：

• Aquatic plants are more likely to absorb TiO2 NPs that are beneficial to them.

关键词： Constructed wetlands     Aquatic plants     Nanoparticles     Physiological activity     Biomass    

HTML PDF 收藏

Effects of nano-silicon and common silicon on lead uptake and translocation in two rice cultivars

Jianguo LIU,Hui CAI,Congcong MEI,Mingxin WANG

《环境科学与工程前沿（英文）》 2015年 第9卷 第5期   页码 905-911 doi: 10.1007/s11783-015-0786-x

摘要： The current study investigated the effects of nano-silicon (Si) and common Si on lead (Pb) toxicity, uptake, translocation, and accumulation in the rice cultivars Yangdao 6 and Yu 44 grown in soil containing two different Pb levels (500 mg·kg and 1000 mg·kg ). The results showed that Si application alleviated the toxic effects of Pb on rice growth. Under soil Pb treatments of 500 and 1000 mg·kg , the biomasses of plants supplied with common Si and nano-Si were 1.8%–5.2% and 3.3%–11.8% higher, respectively, than those of plants with no Si supply (control). Compared to the control, Pb concentrations in rice shoots supplied with common Si and nano-Si were reduced by 14.3%–31.4% and 27.6%–54.0%, respectively. Pb concentrations in rice grains treated with common Si and nano-Si decreased by 21.3%–40.9% and 38.6%–64.8%, respectively. Pb translocation factors (TFs) from roots to shoots decreased by 15.0%–29.3% and 25.6%–50.8%, respectively. The TFs from shoots to grains reduced by 8.3%–13.7% and 15.3%–21.1%, respectively, after Si application. The magnitudes of the effects observed on plants decreased in the following order: nano-Si treatment>common Si treatment and high-grain-Pb-accumulating cultivar (Yangdao 6)>low-grain-Pb-accumulating cultivar (Yu 44) and heavy Pb stress (1000 mg·kg )>moderate Pb stress (500 mg·kg )>no Pb treatment. The results of the study indicate that nano-Si is more efficient than common Si in ameliorating the toxic effects of Pb on rice growth, preventing Pb transfer from rice roots to aboveground parts, and blocking Pb accumulation in rice grains, especially in high-Pb-accumulating rice cultivars and in heavily Pb-polluted soils.

关键词： silicon (Si)     lead (Pb)     rice (Oryza sativa L.)     toxicity     accumulation    

HTML PDF 收藏

Relationship between heavy metal concentrations of herbaceous plants and soils at four Pb-Zn mining sites in Yunnan, China

Yuan LI , Yanqun ZU , Qixian FANG , Zhaohua GAO , Christian SCHVARTZ ,

《环境科学与工程前沿（英文）》 2009年 第3卷 第3期   页码 325-333 doi: 10.1007/s11783-009-0024-5

摘要： This paper studied the relationship between heavy metal concentrations of herbaceous plants and soils at four Pb-Zn mining sites in Yunnan, China. 50 herbaceous plant samples of 9 plant species from 4 families and 50 soil samples were collected and then ana1yzed for the tota1 concentrations of Pb, Cd, and Zn. The results showed that the average concentrations of Pb, Cd, and Zn in soil samples were 3772.83, 168.81, and 5385.65 mg/kg, respectively. The average concentrations of Pb, Cd, and Zn were 395.68, 28.14, and 1664.20 mg/kg in the shoots, and 924.12, 57.25 , and 1778.75 mg/kg in the roots, respectively. Heterospecific plants at the same site and conspecific plants at various sites had different average levels of Pb, Cd, and Zn, both in the shoots and the roots. Enrichment coefficients of Pb, Cd, and Zn were greater than 1 in 2, 3, and 9 herbaceous plant samples, respectively. Translocation factors of Pb, Cd, and Zn were greater than 1 in 10, 17, and 25 herbaceous plant samples, respectively. In all 50 samples, the concentrations of Pb, Cd, and Zn between the shoots and the roots, the shoots, and the soils, and the roots and the soils had significant positive relationships.

关键词： Pb     Cd     Zn     herbaceous plants     Pb-Zn mining areas     enrichment coefficient     translocation factor    

HTML PDF 收藏

Emerging molecular subtypes and therapeutic targets in B-cell precursor acute lymphoblastic leukemia

Jianfeng Li, Yuting Dai, Liang Wu, Ming Zhang, Wen Ouyang, Jinyan Huang, Saijuan Chen

《医学前沿（英文）》 2021年 第15卷 第3期   页码 347-371 doi: 10.1007/s11684-020-0821-6

摘要： B-cell precursor acute lymphoblastic leukemia (BCP-ALL) is characterized by genetic alterations with high heterogeneity. Precise subtypes with distinct genomic and/or gene expression patterns have been recently revealed using high-throughput sequencing technology. Most of these profiles are associated with recurrent non-overlapping rearrangements or hotspot point mutations that are analogous to the established subtypes, such as rearrangements, rearrangements, rearrangements, rearrangements, / and/or rearrangements, like gene expression, PAX5alt (diverse alterations, including rearrangements, intragenic amplifications, or mutations), and hotspot mutations PAX5 (p.Pro80Arg) with biallelic alterations, IKZF1 (p.Asn159Tyr), and ZEB2 (p.His1038Arg). These molecular subtypes could be classified by gene expression patterns with RNA-seq technology. Refined molecular classification greatly improved the treatment strategy. Multiagent therapy regimens, including target inhibitors (e.g., imatinib), immunomodulators, monoclonal antibodies, and chimeric antigen receptor T-cell (CAR-T) therapy, are transforming the clinical practice from chemotherapy drugs to personalized medicine in the field of risk-directed disease management. We provide an update on our knowledge of emerging molecular subtypes and therapeutic targets in BCP-ALL.

关键词： BCP-ALL     subtypes     translocation     aneuploidy     sequence mutations    

HTML PDF 收藏

肠道不同解剖部位的菌群组成及其在结直肠癌中的作用

赵浏阳, 张翔, 左涛, 于君

《工程（英文）》 2017年 第3卷 第1期   页码 90-97 doi: 10.1016/J.ENG.2017.01.012

摘要：

结直肠癌是由遗传突变、表观遗传改变、慢性炎症、饮食和生活方式等多因素引起的多阶段疾病。最新研究表明，肠道菌群是结直肠癌发展过程中的重要参与者。肠道菌群稳态的失调，可通过诱发炎症、调控宿主防御、氧化应激和改变细菌代谢产物等机制促进结直肠癌的发生发展。值得注意的是，肠道横、纵截面上不同解剖部位的驻留菌群有所不同。根据细菌在肠道中定植部位的不同，可将其划分为4 种类型：肠腔共生菌、肠黏膜驻留菌、上皮驻留菌和淋巴组织驻留菌。由于结肠共生细菌的易位与结直肠癌的发展密切相关，结直肠癌相关细菌可有望成为用于结直肠癌诊断的非侵入且准确性高的新型生物标志物。本文旨在总结和概述肠道不同解剖部位中的肠道菌群在结直肠癌发生发展中的作用。

关键词： 菌群     结直肠癌     肠腔共生菌     易位     生物标志物    

HTML PDF 收藏

pakchoi cultivars with low cadmium accumulation and soil factors that affect their cadmium uptake and translocation

Lin WANG,Yingming XU,Yuebing SUN,Xuefeng LIANG,Dasong LIN

《环境科学与工程前沿（英文）》 2014年 第8卷 第6期   页码 877-887 doi: 10.1007/s11783-014-0676-7

摘要： The selection and use of low-Cd-accumulating cultivar (LCAC) has been proposed as one of the promising approaches in minimizing the entry of Cd in the human food chain. This study suggests a screening criterion of LCACs focusing on food safety. Pot culture and plot experiments were conducted to screen out LCACs from 35 pakchoi cultivars and to identify the crucial soil factors that affect Cd accumulation in LCACs. Results of the pot culture experiment showed that shoot Cd concentrations under the three Cd treatments significantly varied across cultivars. Two cultivars, Hualv 2 and Huajun 2, were identified as LCACs because their shoot Cd concentrations were lower than 0.2 mg·kg under low Cd treatment and high Cd exposure did not affect the biomass of their shoots. The plot experiment further confirmed the consistency and genotypic stability of the low-Cd-accumulating traits of the two LCACs under various soil conditions. Results also showed that soil phosphorus availability was the most important soil factor in the Cd accumulation of pakchoi, which related negatively not only to Cd uptake by root but also to Cd translocation from root to shoot. The total Cd accumulation and translocation rates were lower in the LCACs than in the high-Cd cultivar, suggesting that Cd accumulation in different cultivars is associated with the Cd uptake by root as well as translocation from root to shoot. This study proves the feasibility of the application of the LCAC strategy in pakchoi cultivation to cope with Cd contamination in agricultural soils.

关键词： pakchoi (Brassica chinensis L.)     cadmium contamination     low-cadmium-accumulating cultivar (LCAC)     genotype variation     soil factor     translocation    

HTML PDF 收藏

A rare case of B-lymphoproliferative disorder with villous lymphocytes harboring t(8;14)(q24;q32) translocation

null

《医学前沿（英文）》 2018年 第12卷 第3期   页码 324-329 doi: 10.1007/s11684-017-0558-z

摘要：

Splenic lymphoma with villous lymphocytes (SLVL) or splenic marginal zone lymphoma with circulating villous lymphocytes is rare, and prolymphocytic transformation of SLVL is rarer. At present, only one case of SLVL with t(8;14)(q24;q32) translocation has been reported. In this study, we report a case of B-lymphoproliferative disorder with villous lymphocytes harboring t(8;14)(q24;q32) chromosome translocation that we inclined to SLVL with a prolymphocytic transformation. A 73-year-old female showed marked hepatosplenomegaly and high lymphocytosis (lymphocytes>200×109/L). The abnormal lymphocytes had short coarse villi and round nuclei with prominent nucleoli. The immunophenotypes showed CD19+, CD20+, HLA-DR+, CD22+, CD5+, Kappa+, CD25dim, CD71dim, Lambda−, CD7−, CD10−, CD23−, CD34−, CD33−, CD13−, CD14−, CD117−, CD64−, CD103−, and CD11c−. The karyotype showed complex abnormality: 46XX,+3,−10, t(8;14)(q24;q32)[11]/46XX[9]. The cytoplasmic projection, immunological characteristics, and trisomy 3 chromosome abnormality supported the diagnosis of SLVL. However, the presence of prominent nucleoli and high lymphocytosis suggested prolymphocytic transformation, probably as a result of t(8,14) chromosome translocation. In this report, we described an unusual case of B-lymphoproliferative disorder with villous lymphocytes harboring t(8;14)(q24;q32) translocation, which could provide help in the diagnosis and differential diagnosis of B-lymphocytic proliferative diseases.

关键词： splenic lymphoma with villous lymphocytes     splenic marginal zone lymphoma     transformation     chromosome translocation    

HTML PDF 收藏

标题 作者 时间 类型 操作

Modeling and simulation of droplet translocation and fission by electrowetting-on-dielectrics (EWOD)

Nathan HOWELL, Weihua LI

期刊论文

Translocation and biotoxicity of metal (oxide) nanoparticles in the wetland-plant system

期刊论文

Effects of nano-silicon and common silicon on lead uptake and translocation in two rice cultivars

Jianguo LIU,Hui CAI,Congcong MEI,Mingxin WANG

期刊论文

Relationship between heavy metal concentrations of herbaceous plants and soils at four Pb-Zn mining sites in Yunnan, China

Yuan LI , Yanqun ZU , Qixian FANG , Zhaohua GAO , Christian SCHVARTZ ,

期刊论文

Emerging molecular subtypes and therapeutic targets in B-cell precursor acute lymphoblastic leukemia

Jianfeng Li, Yuting Dai, Liang Wu, Ming Zhang, Wen Ouyang, Jinyan Huang, Saijuan Chen

期刊论文

肠道不同解剖部位的菌群组成及其在结直肠癌中的作用

赵浏阳, 张翔, 左涛, 于君

期刊论文

pakchoi cultivars with low cadmium accumulation and soil factors that affect their cadmium uptake and translocation

Lin WANG,Yingming XU,Yuebing SUN,Xuefeng LIANG,Dasong LIN

期刊论文

A rare case of B-lymphoproliferative disorder with villous lymphocytes harboring t(8;14)(q24;q32) translocation

null

期刊论文