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| 1 | Differential mercury volatilization by tobacco organs expressing a modi-fied bacterial merA gene显示文摘Mercury pollution is a major environmental problem accompanying industrial activities. Most of the mercury released ends up and retained in the soil as complexes of the toxic ionic mercury (Hg2+), which then can be converted by microbes into the even more toxic methylmercury which tends to bioaccumulate. Mercury detoxification of the soil can also occur by microbes converting the ionic mercury into the least toxic metallic mercury (Hg0) form, which then evaporates. The remediation potentia1 of transgenic plants carrying the MerA gene from E. coLi encoding mercuric ion reductase could be evaluated. A modified version of the gene, optimized for plant codon preferences (merApe9, Rugh et al. 1996), was introduced into tobacco by Agrobacterium-mediated leaf disk transformation. Transgenic seeds were resistant to HgCl2 at 50 μM and some of them (10-20% ) could germinate on media containing as much as 350 μM HgCl2, while the control plants were fully inhibited or died on 50 μM HgCl2. The rate of elemental mercury evolution from Hg2+ (added as HgCl2) was 5-8 times higher for transgenic plants than the control. Mercury volatilization by isolated organs standardized for fresh weight was higher (up to 5 times) in the roots than in shoots or the leaves. The data suggest that it is the root system of the transgenic plants that volatilizes most of the reduced mercury (Hg0). It also suggests that much of the mercury need not enter the vascular system to be transported to the leaves for volatilization. Thansgenic plants with the merApe9 gene may be used to mercury detoxification for environmental improvement in mercury-- contaminated regions more efficiently than it had been predicted based on data on volatilization of whole plants via the upper parts only (Rugh et al. 1996). | HE YU KE, JIAN GE SUN, XIAN ZHONG FENG, MIHALY CZAKU, LASZLO MARTON Depariment of Biological Sciences, University of South Carolina, 700 Sumter Street, Columbia, SC29208, USA National Laboratory of Plant Molecular Genetics, Shanghai Institute of Plant Phy | 2001 | Cell Research2001，11，3： | 14 |
| 2 | HIGH-ENERGY PROTON IRRADIATION EFFECTS ON GaAs/Ge SPACE SOLAR CELLS显示文摘This paper reports the high-energy proton irradiation effects on GaAs/Ge space solar cells. The solar cells were irradiated by protons with energy of 5-20MeV at fluence ranging from 1×109cm2 to 7×1013cm-2, and then their electric parameters were measured at AMO. It was shown that the Iac, Voc,. and Pmax degrade as the fluence increasing, respectively, but the degradation rates of L,, V0 and Pmax decrease as the proton energy increasing, and the degradation is relative to proton irradiation-induced defect with a level of E -0.41eV in irradiated GaAs/Ge cells. | R. Wang (The Key Laboratory of Beam Technology and Materials Modification of Ministry of Education, Institute of Low Energy Nuclear Physics, Beijing Normal University Beijing Radiation Center, Beijing 100875, China) S.D. Yao (Department of Technical Phys | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，6： | 9 |
| 3 | Studies on the Mechanism of the Direct Synthesis of Styrene form Benzene and Ethylene显示文摘StudiesontheMechanismoftheDirectSynthesisofStyreneformBenzeneandEthyleneZHANGQiang,JINRi-guang(CollegeofMater,Sci,andTech,Bei... | ZHANG Qiang , JIN Ri-guang (College of Mater, Sci, and Tech, Beijing Univ, of Them, Beijing,100029) YANG Jun (Dept. of Phys, Chem, Shenyang Pharmaceutical Univ., Shenyang,110015) | 1997 | Chemical Research in Chinese Universities1997，13，3： | 5 |
| 4 | Chem显示文摘 | Yu M F Yakobson B I and Ruoff R S Phys J | 2000 | B2000，104，： | 1 |
| 5 | Sin显示文摘 | Chen J J Duan J Z Zhang X Z Jiang X Duan W S 2015 Acta Phys | 2015 | 64 238101 (in Chinese)2015，，： | 1 |
| 6 | Sin显示文摘 | Yan X Z Kuang X Y Mao A J Kuang F G Wang Z H Sheng X W 2013 Acta Phys | 2013 | 62 107402 (in Chinese)2013，，： | 1 |
| 7 | Genderdifferences in the Colorado Stroke Registry显示文摘 | Smith DB Mur phy P Santos P | 2009 | Stroke2009，40，： | 1 |
| 8 | Regression of uterine Ieiomyomata in respouse to the antiprogeterode Ru486 显示文摘 | Mur Phy AA Kettel IM Mora Ies AJ | 1993 | J olin Endocrinol metab1993，76，： | 1 |
| 9 | Immunolocalization of inhibin and activin subunits in human endomentrium across the menstrual cycle 显示文摘 | Leung PHY Salamonsen LA Findly JK | 1998 | Human Reproduction1998，13，： | 1 |
| 10 | 查看详情显示文摘 | Hooft G Nucl Phys B | 1974 | 1974，，： | 1 |
| 11 | Comparison of usual surgical advice versus a nonaggravating six-month gym-based exercise rehabilitation program post lumbar discectomy:resuhs at one-year follow-up显示文摘 | Barry L Donaldson Dip Phys | 2006 | The Spine Journal2006，6，： | 1 |
| 12 | Comparison of usual surgicaladvice versus a nonaggravating six-month gym-based exercise re-habilitation program post lumbar discectomy:resuhs at one-yearfollow-up显示文摘 | Barry L Donaldson Dip Phys et a1 | 2006 | The Spine Journal2006，6，： | 1 |
| 13 | Perfusion CT: noninvasive cancer response to concurrent chemo-and racliation therapy显示文摘 | Park M Klotz E Phys D | 2009 | Radiology2009，250，1： | 1 |
| 14 | Rev, 显示文摘 | Hebard A F Reuel R R and Eom C B Phys | 1996 | B54 : 140521996，54，14： | 1 |
| 15 | Phase transition in a restricted solid-on-solid surface-growth model in 2 + 1 dimensions显示文摘 | Amar J G and Family F Phys | 1990 | Rev Lett1990，64，： | 1 |
| 16 | Morphological criteria for the diagnosis of polycystic ovarian syndrome(PCOS)by 3- dimensional(3D)transvaginal ultrasound(TVUS)显示文摘 | ALLEMAND M PHY J FOONG S C | 2004 | Fertil Steril2004，82，1： | 1 |
| 17 | Analysis of musculoskeletal loading in an index finger during tapping显示文摘 | Wu JZ An Med Eng phys KN Cutlip RG | | 0，，03： | 1 |
| 18 | , Observing the progressive decoherence of the 'meter' in a quantum measurement显示文摘 | M Brune E Hagley Phys Rev Lett | 1996 | Phys Rev Lett1996，77，24： | 1 |
| 19 | 查看详情显示文摘 | Gao G B Fan Z F Morkoc H Phys | | 0，，： | 1 |
| 20 | Spin negative differential resistance in edge doped zigzag graphene nanoribbons显示文摘 | Appl Phys superlattic- Jiang C Wang X F Zhai M X | 2014 | Carbon2014，68，： | 1 |
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