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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 | Cellulose conversion to polyols on supported Ru catalysts in aqueous basic solution显示文摘It is of great significance and challenge to achieve direct conversion of cellulose to specific polyols,e.g.,ethylene glycol and propylene glycol.For such selective conversion,a novel one-pot approach was studied by combination of alkaline hydrolysis and hydrogenation on supported Ru catalysts.A wide range of bases including solid bases,e.g.,Ca(OH)2 and La2O3,and phosphate buffers were examined in the cellulose reaction in water,and the cellulose conversions and polyol products depended largely on the basicity or pH values in the aqueous solutions.Ethylene glycol,1,2-propanediol,and especially 1,2,5-pentanetriol were obtained with selectivities of 15%,14% and 22%,respectively,at 38% cellulose conversion at pH 8 in phosphate buffer solution.These preliminary results provide potentials for efficient conversion of cellulose to targeted polyols by using the advantages of bases. | DENG TianYin,SUN JiYing & LIU HaiChao Beijing National Laboratory for Molecular Sciences,State Key Laboratory for Structural Chemistry of Stable and Unstable Species Green Chemistry Center,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China | 2010 | Science China Chemistry2010，53，7： | 8 |
| 3 | HeI photoelectron spectroscopic (PES) studies of the electronic structure in ω-heterocycle a-cyano polyenic ethyl ester compounds显示文摘HeI photoelectron spectra of w-heterocycle a-cyano polyenic ethyl ester compounds (1-6) have been given in this paper. Assignment of the spectra is also done with the aid of HeI photoelectron spectroscopic (PES) results of smaller molecules which have similar atomic group to the molecules studied, and the aid of MNDO molecules orbital calculations. The lowest PES experimental ionization potentials (IPs in eV) of different molecules reduce gradually with the increasing number of ethylenic group. The -CO2C2H5 group can be only considered as a substituent. | LI, Ying LI, Sheng CHEN, Ben-Ming WANG, Dian-XunState Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China | 1996 | Chinese Journal of Chemistry1996，14，3： | 6 |
| 4 | 活性氧化铝除氟研究显示文摘针对目前活性氧化铝饮水除氟中存在的问题,进行了生产性试验研究,通过采用原水投加CO_2气体降低pH值、小颗粒活性氧化铝、大流量短历时的NaOH循环再生法等新技术,提高了活性氧化铝的吸附容量和处理水的能力,克服滤料板结和假疲劳,除氟效果稳定可靠,水质好,再生时间短,用药省,降低了基建投资和运转费用。 | North China Municipal Engineering Design Institute A full-scale plant was set up for studying the existing problems on the fluoride removal from drinking water by activated alumina. Some new methods was adopted,such as the addition of CO2to reduce water pH value,the use of small-sized activated alumina,and the employment of a cyclic regeneration at large flow rate with NaOH as regenerant,which result in the improvement of adsorption capacity of activated alumina and treatment capacity, the elimination of the hardening of filtration materials and false fatigue,stable and reliable effectiveness,good quality in water,short regeneration time,small consumption of regenerant. And then the capital and openational costs were reduced. | 1989 | 中国给水排水1989，5，3： | 5 |
| 5 | Solution-phase synthesis of inorganic nanostructures by chemical transformation from reactive templates显示文摘The solution-phase synthesis by chemical transformation from reactive templates has proved to be very effective in morphology-controlled synthesis of inorganic nanostructures. This review paper summarizes the recent progress in solution-phase synthesis of one-dimensional and hollow inorganic nanostructures via reactive templates, focusing on the approaches developed in our lab. The formation mechanisms based on reactive templates are discussed in depth to show the general concepts for the preparation processes. An outlook on the future development in this area is also presented. | HUANG Teng & QI LiMin* Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University, Beijing 100871, China | 2010 | Science China Chemistry2010，53，2： | 4 |
| 6 | The structural model of P_(680)显示文摘INVESTIGATION on photosystem Ⅱ (PS Ⅱ ) of high plants is one of the most important aspects in photosynthesis research. P680 is the primary electron donor in reaction center of PS Ⅱ , which is a crucial component for sun-light conversion and water split in PS Ⅱ. So study on its structure and function is very important. So far, a few structural models of P(680) have been proposed. Typical models are monomolecular model and bimolecular model. There are two types of bimolecular model: bimolecular parallel model and bimolecular angular model. (Note: There is a kind of multiple model. Because it can be obtained from the organization of two bimolecular models, this model is considered as the same sort of bi- | ZHANG Chunxi , ZHANG Xiaodong , LI Liangbi , ZHANG Qiyuan , ZHANG Xingkang and KUANG TingyunPhotosynthesis Research Center and Laboratory of Photosynthesis Basic Research , Institute of Botany , Chinese Academy of Sciences , Beijing 100093, China State Key Laboratory for Structural Chemistry of Unstable and Stable Species , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100080, China | 1999 | Chinese Science Bulletin1999，44，9： | 3 |
| 7 | 2007 chronic angina focused update of the ACC/AHA 2002 guidelines for the management of patients with chronic stable angina : a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines Writing Group to develop the focused update of the 2002 guidelines for the management of patients with chronic stable angina显示文摘 | Fraker TD Jr Fihn SD 2002 Chronic Stable Angina Writing Committee | 2007 | J Am Coll Cardiol2007，50，23： | 1 |
| 8 | The Locking-proximal- humerus-plate (LPHP) for proximal humeral fractures using a small anterlor-lateral-del approach-techniq toid-splitting- ue and first results 显示文摘 | Lill H Hepp angle stable P Rose T | 2004 | Zentralbl CMr2004，129，： | 1 |
| 9 | Etythmplasia of Qu- eyrat treated by topical aminolaevulinic acid photodynamic therapy 显示文摘 | Stables GI Stringer MR Robinson D J | 1999 | Br J Dermatol1999，140，3： | 1 |
| 10 | feces and feathers can indicateintra-individual changes in the diet of migratory songbirds 显示文摘 | Podlesak D W McWilliams S R Hatch K A Stable isotopes in breath blood | 2005 | OecoLogia2005，142，4： | 1 |
| 11 | Microbiological effect of photo- dynamic therapy (PDT) in healthy volunteers:a comparative study u- sing methyl aminolaevulinate and hexylaminolaevulinate cream 显示文摘 | Yung A Stables GI Fernandez C | 2007 | Clin and Exp Dermatol2007，32，6： | 1 |
| 12 | Gravity waves and ageostrophic wind forcing显示文摘 | Rogers DP Johnson DW Friehe CA The stable internal boundary layer over a coastal sea Ⅱ | 1995 | J Atmos Sci1995，52，： | 1 |
| 13 | Improved- early results aler heart valve surgery over the last decade显示文摘 | HeUgren L Kvidal P Stable E | 2012 | European journal of cardio-thoracic surgery: Official journal of the Association for Cardio-lfiomcic Surgery2012，6，6： | 1 |
| 14 | Decreased plasma retinol, α-tocopherol, and zinc concentration during the periparturient period : effect of milk fever 显示文摘 | Goff J P Stable J R | 1990 | J Dairy Sci1990，73，： | 1 |
| 15 | Total homocysteine in plasma or serum:methods and clinical application显示文摘 | land PM Refsum H Stable SP | 1993 | Clin Chem1993，39，： | 1 |
| 16 | Topical photodynamic therapy in the treat- ment of hidradenitis suppurativa显示文摘 | Rose RF Stables GI | 2008 | Photodiagn Photodyn Ther2008，15，3： | 1 |
| 17 | Effects of low- dose aspirin on acute inflammatory responses in humans 显示文摘 | Morris T Stables M Hobbs A | 2009 | J Immunol2009，183，3： | 1 |
| 18 | Thoracic aortic aneurysm and dis- section :increasing prevalence and improved outcomes reported in a nationwide population-based study of more than 14 000 cases from 1987 to 2002 显示文摘 | Olsson C Thelin S Stable E | 2006 | Circulation2006，114，24： | 1 |
| 19 | Prevalence of facial acne in adults显示文摘 | Goulden V Stables GI Cunliffe WJ | 1999 | J Am Acad Dermatol1999，41，4： | 1 |
| 20 | Prevalence of facial acne in adults显示文摘 | Goulden V Stables GI Cunliffe WJ | 1999 | J Am Acad Dermatol1999，41，： | 1 |
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