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At-will chromatic dispersion by prescribing light trajectories with cascaded metasurfaces

Light(Science & Applications) 2020年第1期9卷 1108-1116页

作者： andrew mcclung Mahdad Mansouree Amir Arbabi Department of Electrical and Computer Engineering University of Massachusetts Amherst151 Holdsworth WayAmherstMA 01003USA

Chromatic dispersion spatially separates white light into colours,producing rainbows and similar *** to imaging but essential to spectroscopy,chromatic dispersion is the result of material properties in refractive optics and is considered an inherent characteristic of diffractive devices such as gratings and flat ***,we present a fundamental relation connecting an optical system’s dispersion to the trajectories light takes through it and show that arbitrary control over dispersion may be achieved by prescribing specific trajectories,even in diffractive *** cascaded metasurfaces(2D arrays of sub-micron scatterers)to direct light along predetermined trajectories,we present an achromatic twisted metalens and experimentally demonstrate beam deflectors with arbitrary *** new insight and design approach usher in a new class of optical systems with wide-ranging applications.

关键词： dispersion light trajectories

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Circadian rhythms in Arabidopsis and Brassica

Circadian rhythms in Arabidopsis and Brassica

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2011全国植物生物学研讨会

作者： C.Robertson mcclung Department of Biological Sciences Dartmouth CollegeHanoverNew Hampshire03755USA

The endogenous circadian clock confers an internal periodicity that synchronizes an organism with the environmental period imposed by Earth’s rotation;when internal and external periods diverge,performance measures such as net photosynthesis et al decline *** plants,both transcriptional and posttranslational mechanisms are prominent in the basic network architecture of circadian *** Arabidopsis thaliana,as in most other eukaryotes studied to date, the circadian clock includes multiple interlocked feedback *** we report two putative transcriptional factors,SA5,and its partially redundant homolog CS1,play

关键词： biological clock circadian rhythm transcriptional mechanism Arabidopsis thaliana Brassica rapa

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^(60)Co irradiation effect on cooked rice texture and amylopectin structure

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Nuclear Science and Techniques 1999年第3期10卷 176-179页

作者： BAO Jinsong SHU Qingyao Christine BERGMAN XIA Yingwu Anna mcclung (Institute of Nuclear Agricultural Sciences, Zhejiang University, Huajiachi,Hangzhou, 310029 China USDA/ARS, AT 7, Box 999, Beaumont, TX 77713, USA ) 浙江大学核农所浙江杭州 310029 浙江大学核农所浙江杭州 USDA/ARS 美国

The effect of γ irradiation on the cooked rice texture and amylopectin structure is studied with three varieties (Zhefu 504, Zhefu 802 and Zaogeng T2) subjected to 4kGy, skGy and 12kGy irradiation. The results indicate that irradiation has significant effect on the texture of the cooked rice; the hardness, cohesiveness,gumminess and chewiness reduce significantly with the increase of the irradiation *** also affects the chain length distribution of the amylopectin, the side-chains of amylopectin of Zhefu 504 with the 12DP, Zhefu 802 with 24DP13 and Zaogeng T2 with 24DP13 and 36DP25 are broken.

关键词： ^60Co辐照米饭组织胶淀粉结构稻米品质

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国中学生课外读物水生昆虫和他们的生活

国中学生课外读物水生昆虫和他们的生活

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1971年

作者： Robert M.mcclung 王振容译

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Quantitative Variation in Water-Use Efficiency across Water Regimes and Its Relationship with Circadian, Vegetative, Reproductive, and Leaf Gas-Exchange Traits

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Molecular Plant 2012年第3期5卷 653-668页

作者： Christine E. Edwards Brent E. Ewers C. Robertson mcclung Ping Lou Cynthia Weinig Department of Botany University of Wyoming Laramie WY 82071 USA Present address： USACE ERDC Environmental Laboratory 3909 Halls Ferry Road Vicksburg MS 39180 USA Program in Ecology University of Wyoming Laramie WY 82071 USA Department of Biological Sciences Dartmouth College Hanover NH 03755 USA

Drought limits light harvesting, resulting in lower plant growth and reproduction. One trait important for plant drought response is water-use efficiency （WUE）. We investigated （1） how the joint genetic architecture of WUE, reproductive characters, and vegetative traits changed across drought and well-watered conditions, （2） whether traits with distinct developmental bases （e.g. leaf gas exchange versus reproduction） differed in the environmental sensitivity of their genetic architecture, and （3） whether quantitative variation in circadian period was related to drought response in Brassica rapa. Overall, WUE increased in drought, primarily because stomatal conductance, and thus water loss, declined more than carbon fixation. Genotypes with the highest WUE in drought expressed the lowest WUE in well-watered conditions, and had the largest vegetative and floral organs in both treatments. Thus, large changes in WUE enabled some genotypes to approach vegetative and reproductive trait optima across environments. The genetic architecture differed for gas-exchange and vegetative traits across drought and well-watered conditions, but not for floral traits. Correlations between circadian and leaf gas-exchange traits were significant but did not vary across treatments, indicating that circadian period affects physiological function regardless of water availability. These results suggest that WUE is important for drought tolerance in Brassica rapa and that artificial selection for increased WUE in drought will not result in maladaptive expression of other traits that are correlated with WUE.

关键词： Brassica rapa drought ecophysiology floral traits G matrix leaf gas-exchange traits water-use efficiency vegetative traits

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Genetic structure associated with diversity and geographic distribution in the USDA rice world collection

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Natural Science 2010年第4期2卷 247-291页

作者： Hesham A. Agrama WenGui Yan Melissa Jia Robert Fjellstrom Anna M. mcclung 不详

Cultivated rice (Oryza sativa L.) is structured into five genetic groups, indica, aus, tropical japonica, temperate japonica and aromatic. Genetic characterization of rice germplasm collections will enhance their utilization by the global research community for improvement of rice. The USDA world collection of rice germ-plasm that was initiated in 1904 has resulted in over 18,000 accessions from 116 countries, but their ancestry information is not available. A core subset, including 1,763 accessions repre-senting the collection, was genotyped using 72 genome-wide SSR markers, and analyzed for genetic structure, genetic relationship, global distribution and genetic diversity. Ancestry analysis proportioned this collection to 35% indica, 27% temperate japonica, 24% tropical japonica, 10% aus and 4% aromatic. Graphing model-based ancestry coefficients demon-strated that tropical japonica showed up mainly in the American continents and part of the South Pacific and Oceania, and temperate japonica in Europe and the North Pacific far from the equator, which matched the responses to tem-perature. Indica is adapted to the warm areas of Southern Asia, South China, Southeast Asia, South Pacific and Central Africa and around the equator while aus and aromatic are special types of rice that concentrates in Bangladesh and India. Indica and aus were highly diversified while temperate and tropical japonicas had low diversity, indicated by average alleles and pri-vate alleles per locus. Aromatic has the most polymorphic information content. Indica and aromatic were genetically closer to tropical ja-ponica than temperate japonica. This study of global rice has found significant population stratification generally corresponding to major geographic regions of the world.

关键词： Genetic Structure Rice Ancestry Germplasm Collection Molecular Diversity Global Distribution

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稻米淀粉RVA谱特征与食用品质的关系

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中国农业科学 1998年第3期31卷 25-26+28-29页

作者：舒庆尧吴殿星夏英武高明尉ＡｎｎａＭｃＣｌｕｎｇ浙江农业大学原子核农业科学研究所

对２３个水稻品种的表观直链淀粉含量（ＡＡＣ）、ＲＶＡ谱（用粘度速测仪ＲＶＡ测得的粘滞性谱）和米饭质地进行了研究，结果发现ＲＶＡ谱能较好地区分ＡＡＣ相似的优质和劣质品种。公认的食味较好的优质品种的ＲＶＡ谱往往崩解值大多... 详细信息

对２３个水稻品种的表观直链淀粉含量（ＡＡＣ）、ＲＶＡ谱（用粘度速测仪ＲＶＡ测得的粘滞性谱）和米饭质地进行了研究，结果发现ＲＶＡ谱能较好地区分ＡＡＣ相似的优质和劣质品种。公认的食味较好的优质品种的ＲＶＡ谱往往崩解值大多在１００ＲＶＵ（ＲＶＡ粘度单位）以上，而消减值小于２５ＲＶＵ，且多数为负值；相反，食味差的品种崩解值低于３５ＲＶＵ，而消减值高于８０ＲＶＵ。米饭质地与ＲＶＡ谱特征存在密切关系，米饭硬度与消减值极显著正相关，γ高达０．９０２＊＊，与崩解值极显著负相关，γ为－０．７７２＊＊；米饭粘性恰好相反，与消减值和回复值的γ分别为－０．８００＊＊和－０．７１８＊。米饭的硬度与ＡＡＣ的相关性因所用品种的不同而差异较大，但粘性始终与ＡＡＣ呈极显著负相关，γ在－０．８６９＊＊左右。消减值和回复值与ＡＡＣ呈极显著正相关，相关系数γ分别为０．５５２＊＊和０．６３５＊＊。

关键词：水稻米饭质地表观直链淀粉含量粘度速测仪

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Preliminary Trial of Cover Cropping and Weed Control for Organic Rice

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American Journal of Plant Sciences 2017年第11期8卷 2758-2768页

作者： Gena R. Mahato Anna mcclung Sixte Ntamatungiro Surendra Singh Meghnath Pokharel Vince Wiley Bihu Huang Department of Agriculture University of Arkansas at Pine Bluff Pine Bluff USA Dale Bumpers National Rice Research Center Stuttgart USA University of Tennessee Knoxville USA Kansas State University Manhattan USA

The experiment site at UAPB agronomy farm was left undisturbed for several years for organic rice experiment. Soil samples taken in September 2015 showed that the experiment site was deficient with plant nutrients (NPK). Therefore, an organic fertilizer, Nature (8-5-5) was applied before planting mixture of crimson clover and winter wheat as cover crop in fall 2015. Biomass samples taken from the cover cropped land (CCL) and fallow land (FL) resulted in decrease in weed biomass by 33.36% and increase in total biomass by 46.78% in CCL than FL. Cover crops were incorporated one month before the rice sowing in June 2016. Fifteen rice cultivars were experimented for weed competition under water seeding cultivation method. Water seeding method was not effective to control the weeds as weeds dominated most of the rice plots since seedling stage. However, two rice cultivars namely Jasmine 85 and Rondo showed strong weed competition due to higher plant stand and better seedling establishment.