检索结果-南通市图书馆

Estimation of irrigation requirements for drip-irrigated maize in a sub-humid climate

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2018年第3期17卷 677-692页

作者： LIU yang yang Hai-shun LI Jiu-sheng LI Yan-feng YAN Hai-jun College of Water Resources and Civil Engineering China Agricultural University Beijing 100083 P.R.China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Beijing 100048 P.R.China Department of Agronomy and Horticulture University of Nebraska-Lincoln Lincoln 68503 United States

Drip-irrigation is increasingly applied in maize （Zea mays L.） production in sub-humid region. It is cdtical to quantify irrigation requirements during different growth stages under diverse climatic conditions. In this study, the Hybrid-Maize model was calibrated and applied in a sub-humid Heilongjiang Province in Northeast China to estimate irrigation requirements for drip- irrigated maize during different crop physiological development stages and under diverse agro-climatic conditions. Using dimensionless scales, the whole growing season of maize was divided into diverse development stages from planting to maturity. Drip-irrigation dates and irrigation amounts in each irrigation event were simulated and summarized in 30-year simulation from 1981 to 2010. The maize harvest area of Heilongjiang Province was divided into 10 agro-climatic zones based on growing degree days, arid index, and temperature seasonality. The simulated results indicated that seasonal irrigation requirements and water stress during different growth stages were highly related to initial soil water content and distribution of seasonal precipitation. In the experimental site, the average irrigation amounts and times ranged from 48 to 150 mm with initial soil water content decreasing from 100 to 20% of the maximum soil available water. Additionally, the earliest drip-irrigation event might occur during 3- to 8-leaf stage. The water stress could occur at any growth stages of maize, even in wet years with abundant total seasonal rainfall but poor distribution. And over 50% of grain yield loss could be caused by extended water stress during the kernel setting window and grain filling period. It is estimated that more than 94% of the maize harvested area in Heilongjiang Province needs to be irrigated although the yield increase varied （0 to 109%） in diverse agro-climatic zones. Consequently, at least 14% of more maize production could be achieved through drip-irrigation systems in Heilongjiang Provinc

关键词： drip irrigation irrigation requirements maize agro-climatic regionlization crop simulation sub-humid climate

A novel strategy to enhance resistance to Cucumber mosaic virus in tomato by grafting to transgenic rootstocks

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2016年第9期15卷 2040-2048页

作者： BAI Miao CHEN Wen-ting XIE Bing-yan yang Guo-shun College of Horticulture and Landscape Hunan Agricultural University Institute of Vegetables and Flowers Chinese Academy of Agricultural Sciences

Cucumber mosaic virus（CMV） can infect a wide range of host species. For the lacking of CMV resistant varieties of tomato, RNA interference（RNAi） can be used as a fast and effective method for the generation of transgenic resistant varieties. In this current study, five intron-spliced hairpin RNA（ihp RNA） plant expression vectors aimed at five genes of CMV have been constructed. Transgenic tomatoes were obtained by Agrobacterium tumefaciens-mediated transformation with expression vectors. Highly resistant generations of transgenic plants were employed as rootstocks and grafted onto non-transgenic tomatoes that resulted in the successful transfer of resistance to the scions. Using a novel method of plant cuttings for rootstock propagation, we obtained large quantities of disease-resistant material. Further, this method produces scions that can remain undetectable for transgenic resistance marker genes that may provide novel approaches to evade collective concerns about genetically-modified organism（GMO） biosafety.

关键词： Cucumber mosaic virus(CMV) graft RNA silencing Solanum lycopersicum virus resistance

Local Scour and the Laws of Scour Pit's Shape Downstream of Debris Flow Sabo Dam

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2013年第6期10卷 1063-1073页

作者： PAN Hua-li yang shun OU Guo-qiang HUANG Jiang-cheng Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Asian International Rivers Center Yunnan University Yunnan Key Laboratory for International Rivers and Transboundary Ecology Security

The erosion shape and the law of development of debris flow sabo dam downstream is a weak part in the study on debris flow erosion. The shape and development of scour pit have an important effect on the stability and safety of debris flow sabo dam, which determines the foundational depth of the dam and the design of protective measures downstream. Study on the scouring law of sabo dam downstream can evaluate the erosion range and reasonably arrange auxiliary protective engineering. Therefore, a series of flume experiments are carried out including different debris flow characteristics （density is varying from 1.5 t/m3 to 2.1 t/m~） and different gully longitudinal slopes. The result shows that the scour pit appears as an oval shape in a plane and deep in the middle while superficial at the ends in the longitudinal section, the position of the maximum depth point moves towards downstream with an increase of flume slope angle. The maximum depth of scour pit is mainly affected by the longitudinal slope of gully, density of debris flow, and the characteristics of gully composition （particle size and the viscosity of soil）. The result also indicates that the viscosity of soil will weaken the erosion extent. The interior slopes of scour pit are different between the upstream and the downstream, and the downstream slope is smaller than the upper one. For the viscous and non-viscous sands with the same distribution of gradation, the interior slope of non- viscous sand is smaller than the viscous *** to tbe regression analysis on the experimental data, the quantitative relationship between the interior slope of scour pit, slope of repose under water and the longitudinal slope of gully is established and it can be used to calculate the interior slope of scour pit. The results can provide the basis for the parameter design of the debris flow control engineering foundation.

关键词： Scour pit Debris flow Sabo dam Scouring law Interior slope Flume experiment

川滇块体东边界安宁河-则木河-小江断裂带的三维构造模型:基于多元数据与隐式建模技术

在线全文

学校读者我要写书评

暂无评论

地震地质 2024年第1期46卷 19-34页

作者：王毛毛胡顺阳马皓然梁铂雨张金玉鲁人齐河海大学海洋学院南京210098 中国地震局地质研究所北京100029

安宁河-则木河-小江断裂带位于青藏高原与扬子地块相互拼接的交会部位,代表了川滇菱形块体的东部边界,地震活动频繁。其总体表现为左旋走滑的运动学特征,沿走向断裂结构复杂,为精细表征深部断裂的三维结构特征带来了很大挑战。目前存在... 详细信息

安宁河-则木河-小江断裂带位于青藏高原与扬子地块相互拼接的交会部位,代表了川滇菱形块体的东部边界,地震活动频繁。其总体表现为左旋走滑的运动学特征,沿走向断裂结构复杂,为精细表征深部断裂的三维结构特征带来了很大挑战。目前存在的问题主要包括:主断层面本身的结构复杂特性;断裂交切与主次关系的不确定性;隐伏断层的空间约束;微震活动区域的断层面限定等。传统上,三维构造建模主要依赖于高分辨率的地震反射剖面、三维地震数据体和钻孔等数据约束,可以三角面网的形式在三维空间内使用数量有限的节点定义任意物体的几何形态,进而连接节点模拟物体的拓扑结构。然而,川滇块体东边界等大部分活动构造区域缺少这些高分辨率的数据,即使有相关数据,通常在空间上也非常稀疏。以往有研究利用大量精定位地震和断层地表迹线等数据建立了活动断裂的初始三维模型,但这种方法忽视了震源机制解提供的节面信息对建模的贡献,且未对多元数据采取差异化的权重分配策略。文中基于三维构造隐式建模方法,结合不同约束条件下的深、浅地质与地球物理数据,构建了川滇块体东边界安宁河-则木河-小江断裂带的三维精细构造模型。建模流程充分利用震源机制解提供的节面约束信息,将其与地表断层迹线、重定位地震震中等数据融合,纳入一个考虑差异化权重分配的多次迭代过程,最终实现利用多元数据建立川滇块体东边界断裂三维复杂结构特性的目标。基于隐式建模方法构建的活动断裂的精细三维结构模型可用于断面粗糙度和断裂系统分析,对约束断面上的凹凸体分布与开展地震破裂模拟具有重要意义。

关键词：活动断裂隐式建模方法三维构造建模安宁河-则木河-小江断裂带川滇块体

Characterization and comparison of two C-type lectins with novel key motifs from mud crab Scylla paramamosain

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2022年第4期40卷 1628-1639页

作者： Boxin ZENG Taiwei DONG Yanting XIA shun yang Mengmeng HUANG Hui FEI College of Life Sciences and Medicine Zhejiang Sci-Tech UniversityHangzhou 310018China Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine Zhejiang Sci-Tech UniversityHangzhou 310018China

As an important pattern recognition receptor(PRR)in the innate immune system,C-type lectin plays an important role in the innate immune process of *** C-type lectins Sp CTL-C and Sp CTL-D were characterized from mud crab(Scylla paramamosain).The predicted Sp CTL-C and Sp CTL-D proteins both contain a single carbohydrate-recognition domain(CRD)with key motif Gln-Pro-Ala(QPA)and Met-Pro-Ala(MPA),*** CTL-C and Sp CTL-D transcripts distributed in all examined tissues,and the expression level was the highest in *** PRR,the purifi ed recombinant proteins r Sp CTL-C and r Sp CTL-D have high affi nity for three kinds of pathogen-associated molecular patterns(PAMPs):β-glucan,lipopolysaccharide,and ***,r Sp CTL-D can bind to all nine microorganisms tested,while r Sp CTL-C can bind to seven microorganisms except for Staphylococcus aureus and Micrococcus *** r Sp CTL-C and r Sp CTL-D showed agglutination activity towards fungi Pichia pastoris and Saccharomyces ***,r Sp CTL-C and r Sp CTL-D exhibited diff erent antimicrobial activities:r Sp CTL-D has a certain inhibitory eff ect on the growth of Vibrio fl uvialis and ***,while r Sp CTL-C has no obvious inhibitory *** results show that r Sp CTL-C and r Sp CTL-D had better phagocytosis-promoting eff ect on *** than the negative ***,both r Sp CTL-C and r Sp CTL-D had certain encapsulation-promoting ***,two C-type lectins with novel key motifs make an important impact as PRR in immune response towards *** the same time,they play diff erent functions in the innate immunity of mud crab ***.

关键词： Scylla paramamosain immune response innate immunity C-type lectin

野酿2号毛葡萄果实发育进程中苹果酸代谢规律及相关基因表达分析

在线全文

学校读者我要写书评

暂无评论

南方农业学报 2024年第8期55卷 2332-2341页

作者：覃红梅杨国顺梁晓文罗飞雄何建军湖南农业大学园艺学院/湖南省葡萄工程技术研究中心湖南长沙410128 广西特色作物研究院/广西桂北特色经济作物种质创新与利用实验室广西桂林541004

【目的】分析野酿2号毛葡萄果实发育进程中苹果酸代谢规律及相关基因表达情况,为提高野酿2号毛葡萄的酿造品质及优质葡萄酒生产提供参考依据。【方法】以5年生野酿2号毛葡萄为试验材料,于盛花后5~17周采集不同生长发育阶段果实,测定果... 详细信息

【目的】分析野酿2号毛葡萄果实发育进程中苹果酸代谢规律及相关基因表达情况,为提高野酿2号毛葡萄的酿造品质及优质葡萄酒生产提供参考依据。【方法】以5年生野酿2号毛葡萄为试验材料,于盛花后5~17周采集不同生长发育阶段果实,测定果实单粒重、pH、可溶性固形物和可滴定酸含量,采用高效液相色谱法测定果实中苹果酸、柠檬酸和酒石酸含量;使用酶标仪测定苹果酸代谢关键酶[苹果酸脱氢酶(NAD-MDH)、NADP-苹果酸酶(NADP-ME)和磷酸烯醇式丙酮酸羧化酶(PEPC)]活性;采用实时荧光定量PCR检测苹果酸代谢相关基因PEPC、MDH和ME的相对表达量,并分析3个基因与苹果酸含量的相关性。【结果】野酿2号毛葡萄果实单粒重在转色期前增长较快,转色期的果实pH、可溶性固形物、苹果酸含量分别是盛花后5周的1.03、1.36和2.38倍,盛花后11周可滴定酸含量达峰值,为35.68 mg/g。盛花后5~17周,野酿2号毛葡萄果实中酒石酸和柠檬酸含量变化不明显,而苹果酸含量变化幅度较大。盛花后8周,NAD-MDH和NADP-ME活性最高,分别为736.06和453.50 nmol/(g·min),幼果期PEPC活性较高。转色期果实中MDH基因的相对表达量是盛花后5周的1.62倍,而PEPC和ME基因的相对表达量均低于盛花后5周。相关分析结果表明,苹果酸含量与MDH基因呈极显著正相关(P<0.01),与PEPC基因呈显著正相关(P<0.05,下同),与ME基因呈显著负相关。【结论】野酿2号毛葡萄苹果酸含量变化是影响总酸变化趋势的主要因素,转色期是苹果酸含量由积累到降低的转折期,苹果酸含量受相关基因MDH、PEPC和ME表达调控。

关键词：野酿2号毛葡萄果实不同发育阶段苹果酸酶活性基因表达

在线全文

学校读者我要写书评

暂无评论

硫铝酸盐水泥基套筒灌浆料强度性能试验研究

工程建设与设计 2024年第7期 180-182页

作者：杨光温子怡张鑫杨雨顺赵靖铭西安欧亚学院人居环境学院西安710065 城市智慧建造陕西省高校工程研究中心西安710065

以硫铝酸盐水泥作为套筒灌浆料的胶凝材料,在水胶比一定的情况下,研究掺入5%、10%、15%和20%的粉煤灰及养护温度为-5℃时该灌浆料的流动度和抗压强度。试验结果表明:粉煤灰掺量分别为5%、20%时,30 min后流动度分别为274 mm、293 mm;当... 详细信息

以硫铝酸盐水泥作为套筒灌浆料的胶凝材料,在水胶比一定的情况下,研究掺入5%、10%、15%和20%的粉煤灰及养护温度为-5℃时该灌浆料的流动度和抗压强度。试验结果表明:粉煤灰掺量分别为5%、20%时,30 min后流动度分别为274 mm、293 mm;当粉煤灰掺量分别为5%、20%时,养护时间均为28 d时,灌浆料的抗压强度分别为80 MPa和98 MPa。由试验结果可知,随着粉煤灰掺入量的增加,灌浆料的流动性能逐渐增大,当掺量为20%时,套筒灌浆料的流动度性能最好;灌浆料的抗压强度随时间的推移呈上升趋势,粉煤灰的掺量为20%时,灌浆料的抗压强度最佳。

关键词：硫铝酸盐水泥套筒灌浆料抗压强度温度流动度粉煤灰

Kinetics of Infection-Driven Growth Model with Birth and Death

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第9期50卷 787-792页

作者： yang shun-You ZHU Sheng-Qing KE Jian-Hong LIN Zhen-Quan School of Physics and Electronic Information Wenzhou University Wenzhou 325035 China

We propose a two-species infection model, in which an infected aggregate can gain one monomer from a healthy one due to infection when they meet together. Moreover, both the healthy and infected aggregates may lose one monomer because of self-death, but a healthy aggregate can spontaneously yield a new monomer. Consider a simple system in which the birth/death rates are directly proportional to the aggregate size, namely, the birth and death rates of the healthy aggregate of size k are J1 k and J2k while the self-death rate of the infected aggregate of size k is J3k. We then investigate the kinetics of such a system by means of rate equation approach. For the J1 〉 J2 case, the aggregate size distribution of either species approaches the generalized scaling form and the typical size of either species increases wavily at large times. For the J1 = J2 case, the size distribution of healthy aggregates approaches the generalized scaling form while that of infected aggregates satisfies the modified scaling form. For the J1 〈 J2 case, the size distribution of healthy aggregates satisfies the modified scaling form, but that of infected aggregates does not scale.

关键词： kinetic behavior infection birth/death scaling law

Spectral-domain optical coherence tomography dynamic changes and steroid response in multiple evanescent white dot syndrome

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2017年第8期10卷 1331-1333页

作者： Yan Sheng Wen Sun yang-shun Gu Department of Ophthalmology the First Affiliated HospitalCollege of Medicine Zhejiang University Hangzhou 310003Zhejiang Province China

Dear Editor,Multiple evanescent white dot syndrome （MEWDS） was first described in 1984 as a rare, acute, unilateral,multifocal retinochoroidal disorder, typically affecting young myopic women. Previous studies with fluorescein angiography （FA） and electrophysiology suggested that MEWDS to be a disease in the retinal pigment epithelium （RPE） or outer retina, while recent studies with spectral- domain optical coherence tomography （SD-OCT） suggested it may be an outer retinal disease due to observation of hyperreflective material in outer retina and subtle disruptionsof the ellipsoid zone without RPE disruption.

关键词： OS DS ICGA FA Spectral-domain optical coherence tomography dynamic changes and steroid response in multiple evanescent white dot syndrome Figure