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Field-resolved infrared spectroscopy of biological systems 期刊论文
NATURE, 2020, 577 (7788) : 52-+
作者:  Pupeza, Ioachim;  Huber, Marinus;  Trubetskov, Michael;  Schweinberger, Wolfgang;  Hussain, Syed A.;  Hofer, Christina;  Fritsch, Kilian;  Poetzlberger, Markus;  Vamos, Lenard;  Fill, Ernst;  Amotchkina, Tatiana;  Kepesidis, Kosmas V.;  Apolonski, Alexander;  Karpowicz, Nicholas;  Pervak, Vladimir;  Pronin, Oleg;  Fleischmann, Frank;  Azzeer, Abdallah;  Zigman, Mihaela;  Krausz, Ferenc
收藏  |  浏览/下载:35/0  |  提交时间:2020/07/03

The proper functioning of living systems and physiological phenotypes depends on molecular composition. Yet simultaneous quantitative detection of a wide variety of molecules remains a challenge(1-8). Here we show how broadband optical coherence opens up opportunities for fingerprinting complex molecular ensembles in their natural environment. Vibrationally excited molecules emit a coherent electric field following few-cycle infrared laser excitation(9-12), and this field is specific to the sample'  s molecular composition. Employing electro-optic sampling(10,12-15), we directly measure this global molecular fingerprint down to field strengths 10(7) times weaker than that of the excitation. This enables transillumination of intact living systems with thicknesses of the order of 0.1 millimetres, permitting broadband infrared spectroscopic probing of human cells and plant leaves. In a proof-of-concept analysis of human blood serum, temporal isolation of the infrared electric-field fingerprint from its excitation along with its sampling with attosecond timing precision results in detection sensitivity of submicrograms per millilitre of blood serum and a detectable dynamic range of molecular concentration exceeding 10(5). This technique promises improved molecular sensitivity and molecular coverage for probing complex, real-world biological and medical settings.


  
"Reporting on climate change: A computational analysis of US newspapers and sources of bias, 1997-2017" 期刊论文
GLOBAL ENVIRONMENTAL CHANGE-HUMAN AND POLICY DIMENSIONS, 2020, 61
作者:  Bohr, Jeremiah
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Climate change  Newspaper coverage  Text analysis  Topic modeling  
Analyzing urban forest coverage variation in Guangzhou-Foshan region using factorial analysis based multivariate statistical prediction models 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 432: 121-131
作者:  Wang, J.;  Li, Y. P.;  Sun, J.;  Lin, Y. T.
收藏  |  浏览/下载:16/0  |  提交时间:2019/04/09
Factorial analysis  Forest coverage area  Human activity  Interaction  Multivariate statistical prediction  
The Choice of the Sustainability Assessment Tool Matters: Differences in Thematic Scope and Assessment Results 期刊论文
ECOLOGICAL ECONOMICS, 2017, 136
作者:  de Olde, Evelien M.;  Bokkers, Eddie A. M.;  de Boer, Imke J. M.
收藏  |  浏览/下载:13/0  |  提交时间:2019/04/09
Sustainability indicators  Tool Development  Framework  Coverage Analysis