检索结果-南通市图书馆

Rice science 2018年第5期25卷 250-260页

作者： Tieu-ngoc nguyen LE Beomgi LEE Kyoungwhan BACK Young Soon KIM Hyeonsook CHEONG Department of Biotechnology Chonnam National University Department of Life Science Chosun University

To understand the reallocation of organic nitrogen from leaf to the flower head of rice, the role of glutamine synthetase （GS） was investigated by characterizing GS1 RNAi transgenic rice, which revealed a significant reduction in panicle number and number of seeds per panicle. We observed the expression of GS isotypes at transcriptional and protein levels in flag leaves, leaf sheaths and panicles at three different flower development stages. The mRNA expression of GS1;1 was clearly suppressed in flag leaves, especially at the flowering stage. GS1 protein was barely detectable in flag leaves until the flowering stage, while GS1 protein was compromised in the leaf sheath and panicle, with transient expression of GS2 protein at the flowering stage. The glutamine level in transgenic plants was significantly reduced in both flag leaves and panicles, but ammonium was highly accumulated. The level of other amino acids, including aspartate and asparagine, tended to be higher in RNAi transgenic plants than the wild type plants during the reproductive stage. In addition, accumulation of toxic ammonium in panicles with low glutamine level might have caused low seed-setting in the transgenic rice. These results indicated that nitrogen reallocation was critical for panicle development, and that multiple GS isotypes functioned cooperatively to complete the rice life cycle when leaf nitrogen was remobilized to the developing reproductive organs.

关键词： ammonium grain yield RNA interference panicle development nitrogen reallocation rice glutamine synthase flowering stage

Understanding gastric metastasis of small cell lung carcinoma:Insights from case reports and clinical implications

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第47期30卷 5092-5096页

作者： Nhi Thi Y nguyen Thang Viet Luong Dat Xuan nguyen Linh Duy Le Hai nguyen ngoc Dang Department of Internal Medicine University of Medicine and PharmacyHue UniversityHue 530000Viet Nam Faculty of Medicine Duy Tan UniversityDa Nang 550000Viet Nam

Small cell lung cancer(SCLC)is a common type of primary lung cancer that contributes to approximately 15%of *** is closely associated with tobacco risk *** is also known as a type of lung cancer that has a high mortality rate within a short time due to its rapid growth rate(with tumor doubling time of 30 days)and its tendency to metastasize early in the disease *** primary sites of metastasis in SCLC are similar to those in other primary lung cancers and often include the brain,bones,adrenal glands,liver,and lymph ***,there are a few clinical reports of uncommon metastases,such as gastric metastasis from *** the incidence of this clinical presentation is very low,reported cases have generally resulted in early mortality due to inadequate *** purpose of this letter is to discuss the knowledge related to gastric metastasis from SCLC and remind clinical doctors not to miss atypical symptoms,thereby providing the right attitude to improve the prognosis for these patients.

关键词： Gastric metastasis Small cell lung cancer Primary lung cancer Immunohistochemistry Clinical cases

Degradation behavior of austenite, ferrite, and martensite present in biodegradable Fe-based alloys in three protein-rich pseudo-physiological solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2024年第11期41卷 96-107页

作者： Abdelhakim Cherqaoui quang nguyen Cao Maria Laura Gatto Carlo Paternoster Paolo Mengucci Diego Mantovani Laboratory for Biomaterials and Bioengineering Canada Research Chair I in Biomaterials and Bioengineering for the Innovation in SurgeryDepartment of Min-Met-Materials EngineeringResearch Center of CHU de QuebecDivision of Regenerative MedicineLaval UniversityQuebec CityCanada Department DIISM UniversitàPolitecnica Delle MarcheVia Brecce Bianche 1260131AnconaItaly Department SIMAU&UdR INSTM UniversitàPolitecnica Delle MarcheVia Brecce Bianche 1260131AnconaItaly

This study investigates the degradation behavior of three distinct Fe-based alloys immersed in three pseudo-physiological *** alloys,which have varied Mn and C contents,include a commercially available Fe-0.15C alloy,namely Fe–C,and two newly developed alloys,that is Fe–5Mn-0.2C(namely Fe–5Mn)and Fe–18Mn-0.6C(namely Fe–18Mn).The aim was to understand the effect of alloying elements and the testing solution on the in-vitro degradation behavior of these Fe-based *** immersion degradation and potentiodynamic corrosion tests were carried out using three pseudo-physiological solutions with albumin supply,that is modified Hanks’saline solution(MHSS),phosphate buffered saline solution(PBS),and sodium chloride solution(NaCl).After two weeks of static immersion,the results revealed that Fe–5Mn,characterized by a mixture of ferrite and martensite,showed the highest degradation rate,while Fe–C,composed solely of ferrite,showed the lowest rate of *** predominant degradation products in MHSS and PBS were phosphates and *** PBS,these products formed a remarkably stable protective layer on the surface,contributing to the lowest degradation *** contrast,porous hydroxides appeared as the main degradation products for samples immersed in NaCl solution,leading to the highest degradation *** results provided important insights into the customization of Fe–Mn–C alloys for a range of biomedical applications,meeting a variety of clinical requirements,and highlighting the considerable potential of Fe–Mn–C alloys for biomedical applications.

关键词： Biodegradable metals Fe-based alloys Degradation Albumin Pseudo-physiological solutions

Target tracking method of Siamese networks based on the broad learning system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2023年第3期8卷 1043-1057页

作者： Dan Zhang C.L.Philip Chen Tieshan Li Yi Zuo nguyen quang Duy Navigation College Dalian Maritime UniversityDalianChina Innovation and Entrepreneurship Education College Dalian Minzu UniversityDalianChina Computer Science and Engineering College South China University of TechnologyGuangzhouChina Department of Computer and Information Science Faculty of Science and TechnologyUniversity of MacaoMacaoChina School of Automation Engineering University of Electronic Science and Technology of ChinaChengduChina Faculty of Navigation Vietnam Maritime UniversityHaiphongVietnam

Target tracking has a wide range of applications in intelligent transportation,real‐time monitoring,human‐computer interaction and other ***,in the tracking process,the target is prone to deformation,occlusion,loss,scale variation,background clutter,illumination variation,etc.,which bring great challenges to realize accurate and real‐time *** based on Siamese networks promotes the application of deep learning in the field of target tracking,ensuring both accuracy and real‐time ***,due to its offline training,it is difficult to deal with the fast motion,serious occlusion,loss and deformation of the target during ***,it is very helpful to improve the performance of the Siamese networks by learning new features of the target quickly and updating the target position in time *** broad learning system(BLS)has a simple network structure,high learning efficiency,and strong feature learning *** at the problems of Siamese networks and the characteristics of BLS,a target tracking method based on BLS is *** method combines offline training with fast online learning of new features,which not only adopts the powerful feature representation ability of deep learning,but also skillfully uses the BLS for re‐learning and re‐*** broad re‐learning information is used for re‐detection when the target tracking appears serious occlusion and so on,so as to change the selection of the Siamese networks search area,solve the problem that the search range cannot meet the fast motion of the target,and improve the *** results show that the proposed method achieves good results on three challenging datasets and improves the performance of the basic algorithm in difficult scenarios.

关键词： broad learning system siamese network target tracking

用多层次聚类法完成的大规模关系图的可视化(英文)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

软件学报 2008年第8期19卷 1933-1946页

作者：黄茂林 nguyen quang Vinh Faculty of Information Technology University of TechnologySydneyAustralia

提出了一种新的大规模图形可视化技术.它可显示含有几万个接点和边的大规模关系图.为了完成对图形的抽象化。一个多层次的聚类图形从原始的大规模关系图中抽取了出来.这种抽取是建立在大规模关系图的内在结构基础上来完成的.一种递规封... 详细信息

提出了一种新的大规模图形可视化技术.它可显示含有几万个接点和边的大规模关系图.为了完成对图形的抽象化。一个多层次的聚类图形从原始的大规模关系图中抽取了出来.这种抽取是建立在大规模关系图的内在结构基础上来完成的.一种递规封入式的几何划分算法被应用来完成对几何空间的优化,在具体的制图技术上,使用了一种用力导向布局算法和环形制图法相结合的新方法,从而完成了对显示空间的优化和美擘上的优化.同时也讨论了相关的人机交互技术,所采用的人机交互算法不仅能让使用者从上到下层次式地浏览整个聚类图形。同时也能提供多层次聚类图形的并行浏览.动画技术也同时被运用,以保护使用者的精神图不被打乱.

关键词：图形绘制信息可视化场景游览人机交互聚类图形

N4-methylcytidine ribosomal RNA methylation in chloroplasts is crucial for chloroplast function,development,and abscisic acid response in Arabidopsis

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2021年第3期63卷 570-582页

作者： Le nguyen Tieu ngoc Su Jung Park Trinh Thi Huong Kwang Ho Lee Hunseung Kang Department of Applied Biology College of Agriculture and Life SciencesChonnam National UniversityGwangju 61186Republic of Korea Faculty of Forestry Agriculture Tay Nguyen UniversityBuonMaThuotDakLak63000Vietnam Center for Research Facilities Chonnam National UniversityGwangju 61186Republic of Korea

Although the essential role of messenger RNA methylation in the nucleus is increasingly understood,the nature of ribosomal RNA(rRNA)methyltransferases and the role of rRNA methylation in chloroplasts remain largely unknown.A recent study revealed that CMAL(for Chloroplast mraW-Like)is a chloroplast-localized rRNA methyltransferase that is responsible for N4-methylcytidine(m^(4)C)in 16S chloroplast rRNA in Arabidopsis *** this study,we further examined the role of CMAL in chloroplast biogenesis and function,development,and hormone *** cmal mutant showed reduced chlorophyll biosynthesis,photosynthetic activity,and growth-defect phenotypes,including severely stunted stems,fewer siliques,and lower seed *** cmal mutant was hypersensitive to chloroplast translation inhibitors,such as lincomycin and erythromycin,indicating that the m^(4)C methylation defect in the 16S rRNA leads to a reduced translational activity in ***,the stunted stem of the cmal mutant was partially rescued by exogenous gibberellic acid or *** cmal mutant grew poorer than wild type,whereas the CMAL-overexpressing transgenic Arabidopsis plants grew better than wild type in the presence of abscisic ***,these results indicate that CMAL is an indispensable rRNA methyltransferase in chloroplasts and is crucial for chloroplast biogenesis and function,photosynthesis,and hormone response during plant growth and development.

关键词： abiotic stress Arabidopsis chloroplast CMAL RNA methylation rRNA methylation

Hybrid model to optimize object-based land cover classification by meta-heuristic algorithm:an example for supporting urban management in Ha Noi,Viet Nam

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2019年第10期12卷 1118-1132页

作者： quang-Thanh Bui Manh Pham Van nguyen Thi Thuy Hang Quoc-Huy nguyen nguyen Xuan Linh Pham Minh Hai Tran Anh Tuan Pham Van Cu Center for Applied Research in Remote sensing and GIS(CARGIS) VNU University of ScienceHa NoiViet Nam VNU University of Science Ha NoiViet Nam Vietnam Institute of Geodesy and Cartography Ha NoiViet Nam Ministry of Education and Training Ha NoiViet Nam

This study proposed a novel object-based hybrid classification model named GMNN that combines Grasshopper Optimization Algorithm(GOA)and the multiple-class Neural network(MNN)for urban pattern detection in Hanoi,*** bands of SPOT 7 image and derivable NDVI,NDWI were used to generate image segments with associated attributes by PCI Geomatics *** segments were classified into four urban surface types(namely water,impervious surface,vegetation and bare soil)by the proposed ***,three training and validation datasets of different sizes were used to verify the robustness of this *** all tests,the overall accuracies of the classification were approximately 87%,and the Area under Receiver Operating Characteristic curves for each land cover type was ***,the performance of this model was examined by comparing several statistical indicators with common benchmark *** results showed that GMNN out-performed established methods in all comparable *** results suggested that our hybrid model was successfully deployed in the study area and could be used as an alternative classification method for urban land cover *** a broader sense,classification methods will be enriched with the active and fast-growing contribution of metaheuristic algorithms.

关键词： Urban remote sensing object-based classification neural network grasshopper optimization algorithm

Effects of parental age on offspring growth and survival in both wild and domesticated strains of bighead catfish(Clarias macrocephalus Günther,1864)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2023年第2期8卷 141-147页

作者： Thuy Yen Duong Thet Su Win Thi ngoc Tran nguyen College of Aquaculture and Fisheries Can Tho UniversityCan Tho920000Viet Nam International Master Program in Aquaculture Course 4Can Tho UniversityCan Tho920000Viet Nam

Understanding the relationship between fish parental age and offspring performance over their life cycle is crucial for *** study investigates the effect of parental age for both 1-and 2-year-old fish on the growth and survival rates of their larval to grow-out stages for two wild and domesticated strains of bighead catfish(Clarias macrocephalus).Fish were sampled from the Vietnamese Mekong Delta where wild adult fish were collected from a conservation area in Ca Mau Province and domesticated fish were taken from a hatchery in Can *** offspring treatments of 1-and 2-year-old broodstock strains were reared for 3 successive periods:40 days for fingerling rearing in static tanks with water exchange,60 days for juveniles,and 90 days for grow-out in recirculating *** final weight of fish at 190 days varied from 96.7 to 144.7 *** growth of offspring was not affected by parental age(P>0.05),over the 3 rearing ***,the domesticated fish strain showed significantly better growth rates than the wild fish strain(P<0.05).Feed conversion ratios were comparable across fish *** rates did not differ at the fingerling(21.8%-36.4%)and juvenile(69.0%-73.3%)***,significant differences were found at the grow-out stage(69.3%-84.0%),with offspring from 2-year-old parents of both strains having greater survival ***,1-and 2-year-old fish appear to be suitable for bighead catfish breeders.

关键词： Parental age Clarias catfish Fish growth Strain evaluation Wild broodstock

Morphology and kinematics of the gas envelope of the Mira binary W Aquilae

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第7期16卷 47-54页

作者： Do Thi Hoai Pham Tuyet Nhung Pham ngoc Diep nguyen Thi Phuong Pham Tuan-Anh nguyen Thi Thao Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

We analyse ALMA observations of the12CO（3-2） emission of the circumstellar envelope（CSE）of the Mira variable binary star W Aql. These provide, for the first time, spatially resolved Doppler velocity spectra of the CSE up to angular distances to the central star ofy nature of the observations（only five minutes in each of～5′′（meaning some 2000 AU）. The explorator two different configurations） does not allow for a detailed modelling of the properties of the CSE but provides important qualitative information on its morphology and kinematics. Emission is found to be enhanced along an axis moving from east/west to north-east/south-west when the angular distance from the central star projected on the plane of the sky increases from zero to four arcseconds. In parallel, the Doppler velocity distribution displays asymmetry along an axis moving from east/west to north-west/south-east. The results are discussed in the context of earlier observations, in particular of the dust morphology.

关键词： stars AGB and post-AGB (stars ) circumstellar matter stars individual(W Aql) stars mass-loss radio lines stars

Morphology and kinematics of the gas envelope of the variable AGB star π^1 Gruis

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第7期16卷 97-104页

作者： Pham Tuyet Nhung Do Thi Hoai Pham ngoc Diep nguyen Thi Phuong nguyen Thi Thao Pham Tuan Anh Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

Observations of the ^12CO（3–2） emission from the circumstellar envelope（CSE） of the variable star π1Gru using the compact array of the ALMA observatory have been recently made accessible to the public. An analysis of the morphology and kinematics of the CSE is presented with a result very similar to that obtained earlier for ^12CO（2–1） emission using the Submillimeter Array. A quantitative comparison is made using their flared disk model. A new model is presented that provides a significantly better description of the data, using radial winds and smooth evolutions of the radio emission and wind velocity from the stellar equator to the poles.

关键词： stars AGB and post-AGB circumstellar matter star individual(π1Gru) stars massloss radio lines stars