| 1 | Scoring Cercospora Leaf Spot on Sugar Beet:Comparison of UGV and UAV Phenotyping Systems显示文摘Selection of sugar beet(Beta vulgaris L.)cultivars that are resistant to Cercospora Leaf Spot(CLS)disease is critical to increase yield.Such selection requires an automatic,fast,and objective method to assess CLS severity on thousands of cultivars in the field.For this purpose,we compare the use of submillimeter scale RGB imagery acquired from an Unmanned Ground Vehicle(UGV)under active illumination and centimeter scale multispectral imagery acquired from an Unmanned Aerial Vehicle(UAV)under passive illumination.Several variables are extracted from the images(spot density and spot size for UGV,green fraction for UGV and UAV)and related to visual scores assessed by an expert.Results show that spot density and green fraction are critical variables to assess low and high CLS severities,respectively,which emphasizes the importance of having submillimeter images to early detect CLS in field conditions.Genotype sensitivity to CLS can then be accurately retrieved based on time integrals of UGV-and UAV-derived scores.While UGV shows the best estimation performance,UAV can show accurate estimates of cultivar sensitivity if the data are properly acquired.Advantages and limitations of UGV,UAV,and visual scoring methods are finally discussed in the perspective of high-throughput phenotyping. | S.Jay A.Comar R.Benicio J.Beauvois D.Dutartre G.Daubige W.Li J.Labrosse S.Thomas N.Henry M.Weiss F.Baret | 2020 | Plant Phenomics2020，2，1： | 2 |
| 2 | 世无不老泉显示文摘人类为抗衰老和延长寿命所做的努力最早可追溯至公元前3500年。从那时候起,那些自诩为专家的人就开始鼓吹抗衰老之道,直至今日。追求不朽对人类具有普遍的吸引力,它促使亚历山大大帝(传说他曾和他的部属越过黑暗大地寻找生命之水——译者注)和庞塞·德莱昂(西班牙航海家,在16世纪带领远征队首次“发现”佛罗里达并为之命名。传说他这趟远征是为了寻找不老泉——译者注)去寻找不老泉,激起炼金术士变出黄金(曾被当作是最有效的抗衰老物质,是所谓不死药的成分之一)的欲望。而在最近几十年间,对抗衰老“良方”的兜售尤为壮观:难以计数的大公司引诱极易轻信和常感绝望的各个年龄层的消费者进行所谓的“长寿”治疗,并声称他们推荐的(通常也正是他们所销售的)抗衰老产品拥有科学实证的基础;同时,那些从所谓抗衰老产品中牟利的人也能够利用互联网轻易地接触到新的顾客。 | S.Jay Olshansky Leonard Hayflick Bruce A.Carnes 伏维阁主 | 2013 | 健康管理2013，，9： | 0 |
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