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| 1 | Spectroscopic evidence for triplet excitation energy transfer among carotenoids in the LH2 complex from photosynthetic bacterium Rhodopseudomonas palustris显示文摘The LH2 complex from Rhodopsudomonas (Rps.) palustris is unique in the heterogeneous carotenoid compositions. The dynamics of triplet excited state Carotenoids (3Car*) has been investigated by means of sub-microsecond time-resolved absorption spectroscopy both at physiological temperature (295 K) and at cryogenic temperature (77 K). Broad and asymmetric Tn←T1 transient absorption was observed at room temperature following the photo-excitation of Car at 532 nm, which suggests the contribution from various carotenoid compositions having different numbers of conjugated C=C double bonds (NC=C). The triplet absorption bands of different carotenoids, which superimposed at room temperature, could be clearly distinguished upon decreasing the temperature down to 77 K. At room temperature the shorter-wavelength side of the main Tn←T1 absorption band decayed rapidly to reach a spectral equilibration with a characteristic time constant of~1 μs, the same spectral dynamics, however, was not observed at 77 K. The aforementioned spectral dynamics can be explained in terms of the triplet-excitation transfer among heterogeneous carotenoid compositions. Global spectral analysis was applied to the time-resolved spectra at room temperature, which revealed two spectral components peaked at 545 and 565 nm, and assignable to the Tn←T1 absorption of Cars with NC=C=11 and NC=C=13, respectively. Surprisingly, the decay time constant of a shorter-con- jugated Car, I.e. 0.72 μs (aerobic) and 1.36 μs (anaerobic), is smaller than that of a longer-con- jugated Car, I.e. 2.12 μs (aerobic) and 3.75 μs (anaerobic), which is contradictory to the general rule of carotenoids and relative polyenes. The results are explained in terms of triplet-excitation transfer among different types of Cars. It is postulated that two Cars with different conjugation lengths coexist in an α,β-subunit in the LH2 complex. | FENG Juan, WANG Qian, ZHANG Xujia, HUANG Youguo, Al Xicheng, ZHANG Xingkang & ZHANG JianpingState Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China | 2004 | Science China Chemistry2004，47，1： | 8 |
| 2 | Comparative Study on the Long-term Effect of Permanent Embolization of Hepatic Artery with Bletilla Striata in Patients with 显示文摘ComparativeStudyontheLong-termEffectofPermanentEmbolizationofHepaticArterywithBletillaStriatainPatientswithPrimaryLiverCancer... | FENG Gansheng Cramann B ZHENG Zhuansheng et al(Department of Radiology,Xiehe Hospital, Tongji Medical University,Wuhan 430030 Abteilung fur Radio-Diagnostik,Universitatsklinik,Homburg/Saar,Deutschland) | 1996 | Journal of Huazhong University of Science and Technology(Medical Sciences)1996，16，2： | 8 |
| 3 | Sharkskin-Inspired Magnetoactive Reconfigurable Acoustic Metamaterials显示文摘Most of the existing acoustic metamaterials rely on architected structures with fixed configurations,and thus,their properties cannot be modulated once the structures are fabricated.Emerging active acoustic metamaterials highlight a promising opportunity to on-demand switch property states;however,they typically require tethered loads,such as mechanical compression or pneumatic actuation.Using untethered physical stimuli to actively switch property states of acoustic metamaterials remains largely unexplored.Here,inspired by the sharkskin denticles,we present a class of active acoustic metamaterials whose configurations can be on-demand switched via untethered magnetic fields,thus enabling active switching of acoustic transmission,wave guiding,logic operation,and reciprocity.The key mechanism relies on magnetically deformable Mie resonator pillar(MRP)arrays that can be tuned between vertical and bent states corresponding to the acoustic forbidding and conducting,respectively.The MRPs are made of a magnetoactive elastomer and feature wavy air channels to enable an artificial Mie resonance within a designed frequency regime.The Mie resonance induces an acoustic bandgap,which is closed when pillars are selectively bent by a sufficiently large magnetic field.These magnetoactive MRPs are further harnessed to design stimuli-controlled reconfigurable acoustic switches,logic gates,and diodes.Capable of creating the first generation of untethered-stimuli-induced active acoustic metadevices,the present paradigm may find broad engineering applications,ranging from noise control and audio modulation to sonic camouflage. | Kyung Hoon Lee Kunhao Yu Hasan Al Ba’ba’a An Xin Zhangzhengrong Feng Qiming Wang | 2020 | Research2020，，1： | 2 |
| 4 | Isolation of aerobic denitrifiers and characterization for their potential application in the bioremediation of oligotrophic ecosystem 显示文摘 | Zhu Liang Ding Wei Feng Lijuan et al | 2012 | Bioresource Technology2012，105，： | 1 |
| 5 | Analysis of five differentially expressed gene families in fastelongation cotton fiber显示文摘 | Feng J X Ji S J Shi Y H el al | 2004 | Acta Biochim Biophys Sin2004，36，1： | 1 |
| 6 | Enhanced photocat-alytic performance of ferromagnetic ZnO : Cu hierarchicalmicrostructures 显示文摘 | Liang G F Hu L W Feng W el al | 2014 | Applied Surface Science2014，296，： | 1 |
| 7 | Innate immune adaptor recruitment and myocardial injury after ischemia-reperfusion in mice显示文摘 | Feng Y Zhao H Xu X et MyD88 mediates neutrophil al | 2008 | Am J Physiol Heart Circ Physiol2008，295，3： | 1 |
| 8 | The RNA component of human telomezase 显示文摘 | Feng J Funk WD Wang SS ct al | 1995 | Science1995，269，5228： | 1 |
| 9 | Resection of die intracavernous sinus tumrs~ using a purely endoscopic endonasal approach显示文摘 | Qiuhang Z Hongchuan G Feng K el al | 2014 | J Craniofac Surg2014，25，1： | 1 |
| 10 | Polymorphisms in the vitamin D re ceptor gene and risk of autoimmune thyroid diseases:a meta anal ysis显示文摘 | Feng M Li H Chen SF ct al | 2013 | Endocrine2013，43，2： | 1 |
| 11 | Feedback regulation between zipcode binding protein 1 and beta-catenin mRNAs in breast cancer cells 显示文摘 | Gu Wei Wells AL Pan Feng | 2008 | Mol Cell Biol2008，28，16： | 1 |
| 12 | Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50 to 300 AngstromPores显示文摘 | Zhao D Y Feng J L Huo Q S ef al | 1998 | Science1998，279，5350： | 1 |
| 13 | Measurements of emissionfactors for primary carbonaceous particles from residential raw-coal combustion in China 显示文摘 | Chen Y J Zhi G R Feng Y L ef al | 2006 | Geophysical Research Letters2006，33，20： | 1 |
| 14 | Density Functional Theoretical studies of polyaniline/HNb3O8 Layered Nanocomposites 显示文摘 | Yang Gang Hou Wenhua Feng Xiaomiao Jiang Xuefan ct al | 2007 | Adv Funct Materials2007，17，： | 1 |
| 15 | Increased levels of asymmetric dimethylarginine and C-reactive protein are associated with impaired vascular reactivity in essential hypertension显示文摘 | Xia W Feng W Guan M el al | 2010 | Clin Exp Hypertens2010，32，： | 1 |
| 16 | Alterations of Notch/Jagged mRNA and protein expression after par'tiM hepatecto- my in rats 显示文摘 | Hong Yu Xu Bao Jie Li Rui Feng Wang eL al | 2008 | Scandinavian Journal of Gastroenterology2008，43，： | 1 |
| 17 | Rapid texture measurement of cold-rolled aluminum sheet by X-ray diffraction 显示文摘 | MA Q C MAO W M FENG H P ct al | 2006 | Scripta Materialia2006，54，11： | 1 |
| 18 | Mechanistic models facilitate efficient development of leucine containing microparticles for pulmonary drug delivery 显示文摘 | Feng AL Boraey MA Gwin MA | 2011 | lnt JPharm2011，409，12： | 1 |
| 19 | AGENT based structural static and dynamic collaborative optimization显示文摘 | FENG PEIEN QIAN ZHONGYAN PAN SHUANGXIA el al | 2001 | Science in China (Series E)2001，44，5： | 1 |
| 20 | Estrogen and progestin regulate metastasis through the PI3 K/AKT pathway in human ovarian cancer显示文摘 | Hua K Feng W Cao Q et al | 2008 | Int J Oncol2008，33，5： | 1 |
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