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Search for electron-antineutrinos associated with gravitational-wave events GW150914,GW151012,GW151226,GW170104,GW170608,GW170814,and GW170817 at Daya Bay

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Chinese Physics C 2021年第5期45卷 190-201页

作者： F.P.An A.B.Balantekin H.R.Band M.Bishai S.Blyth G.F.Cao j.Cao j.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen j.Cheng Z.K.Cheng j.j.Cherwinka M.C.Chu j.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal j.dove M.Dvorak D.A.Dwyer j.P.Gallo M.Gonchar G.H.Gong H.Gong W.Q.Gu j.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans M.He K.M.Heeger Y.K.Heng A.Higuera Y.K.Hor Y.B.Hsiung B.Z.Hu j.R.Hu T.Hu Z.j.Hu H.X.Huang X.T.Huang Y.B.Huang P.Huber D.E.jaffe K.L.jen X.L.ji X.P.ji R.A.johnson D.jones L.Kang S.H.Kettell S.Kohn M.Kramer T.j.Langford j.Lee j.H.C.Lee R.T.Lei R.Leitner j.K.C.Leung F.Li j.j.Li Q.j.Li S.Li S.C.Li W.D.Li X.N.Li X.Q.Li Y.F.Li Z.B.Li H.Liang C.j.Lin G.L.Lin S.Lin j.j.Ling j.M.Link L.Littenberg B.R.Littlejohn j.C.Liu j.L.Liu C.Lu H.Q.Lu j.S.Lu K.B.Luk X.B.Ma X.Y.Ma Y.Q.Ma C.Marshall D.A.Martinez Caicedo K.T.MeDonald R.D.McKeown Y.Meng j.Napolitano D.Naumov E.Naumova j.P.Ochoa-Ricoux A.OIshevskiy H.-R.Pan j.Park S.Patton j.C.Peng C.S.j.Pun F.Z.Qi M.Qi X.Qian N.Raper j.Ren C.Morales Reveco R.Rosero B.Roskovec X.C.Ruan H.Steiner j.L.Sun T.Tmej K.Treskov W.-H.Tse C.E.Tull B.Viren V.Vorobel C.H.Wang j.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.j.Wen K.Whisnant C.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.j.Wu D.M.Xia Z.Q.Xie Z.Z.Xing j.L.Xu T.Xu T.Xue C.G.Yang L.Yang Y.Z.Yang H.F.Yao M.Ye M.Yeh B.L.Young H.Z.Yu Z.Y.Yu B.B.Yue S.Zeng Y.Zeng L.Zhan C.Zhang F.Y.Zhang H.H.Zhang j.W.Zhang Q.M.Zhang X.T.Zhang Y.M.Zhang Y.X.Zhang Y.Y.Zhang Z.j.Zhang Z.P.Zhang Z.Y.Zhang j.Zhao L.Zhou H.L.Zhuang j.H.Zou Instiute of Modern Physics East China University of Science and TechnologyShanghai 200237 University of Wisconsin MadisonWisconsin 53706 Wright Laboratory and Department of Physics Yale UniversityNew HavenConnecticut 06520 Brookhaven National Laboratory UptonNew York 11973 Department of Physics National Taiwan UniversityTaipei Institute of High Energy Physics Beijing 100049 National United University Miao-Li Department of Engineering Physics Tsinghua UniversityBejing 100084 Shenzhen University Shenzhen 518060 Sun Yat-Sen(Zhongshan)University Guangzhou North China Electric Power University Bejjing 102206 Chinese University of Hong Kong Hong Kong 999077 Siena College LoudonvilleNew York 12211 Department of Physics and Astronomy University of CaliforniaIrvineCaliformia 92697 University of Science and Technology of China Hefei 230026 Charles University Faculty of Mathematics and PhysicsPrague Department of Physics University of llinois at Urbana-ChampaignUrbanaIlinois 61801 Lawrence Berkeley National Laboratory BerkeleyCalifornia 94720 Department of Physics Illinois Institute of TechnologyChicagoIllinois 60616 joint Institute for Nuclear Research DubnaMoscow Region Beijing Normal University Beijing 100875 Department of Nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049 Department of Physics University of HoustonHoustonTexas 77204 China Institute of Atomic Energy Beijing 102413 Shandong University Jinan 250100 Guangxi University Nanning 530004 Center for Neutrino Physics Virginia TechBlacksburgVirginia 24061 Institute of Physics National Chiao-Tung UniversityHsinchu Department of Physics University of CincinnatiCincinnatiOhio 45221 Department of Physies Collge of Science and TechnologyTemple UniversityPhiladelphiaPennsylvania 19122 Dongguan University of Technology Dongguan 523808 Department of Physics University of CaliforniaBerkeleyCalifornia 94720 Department of Physics The University of Hong KongPokfulamHong Kong 999077 School

The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars *** the Daya Bay experiment,using the data collected from December 2011 to August 2017,a search was per-formed for electron-antineutrino signals that coincided with detected GW events,including GW150914,GW151012,GW151226,GW170104,GW170608,GW 170814,and GW *** used three time windows of±10,±500,and±1000 s relative to the occurrence of the GW events and a neutrino energy range of 1.8 to 100 MeV to search for correlated neutrino *** detected electron-antineutrino candidates were consistent with the expected background rates for all the three time *** monochromatic spectra,we found upper limits(90%confidence level)of the electron-antineutrino fluence of(1.13-2.44)×10^(11)cm^(-2)at 5 MeV to 8.0×10^(7)cm^(-2)at 100 MeV for the three time w *** the assumption of a Fermi-Dirac spectrum,the upper limits were found to be(5.4-7.0)×10^(9)cm^(2)for the three time windows.

关键词： grav itational waves electron-antineutrinos fluence upper limit

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Antineutrino energy spectrum unfolding based on the Daya Bay measurement and its applications

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Chinese Physics C 2021年第7期45卷 1-19页

作者： F.P.An A.B.Balantekin M.Bishai S.Blyth G.F.Cao j.Cao j.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen j.Cheng Z.K.Cheng j.j.Cherwinka M.C.Chu j.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal D.Dolzhikov j.dove M.Dvorak D.A.Dwyer j.P.Gallo M.Gonchar G.H.Gong H.Gong M.Grassi W.Q.Gu j.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans a M.He K.M.Heeger Y.K.Heng Y.K.Hor Y.B.Hsiung B.Z.Hu j.R.Hu T.Hu Z.j.Hu H.X.Huang j.H.Huang X.T.Huang Y.B.Huang P.Huber D.E.jaffe K.L.jen X.L.ji X.P.ji R.A.johnson D.jones L.Kang S.H.Kettel S.Kohn M.Kramer T.j.Langford j.Lee j.H.C.Lee R.T.Lei R.Leitner j.K.C.Leung F.Li H.L.Li j.j.Li Q.j.Li R.H.Li S.Li S.C.Li W.D.Li X.N.Li X.Q.Li Y.F.Li Z.B.Li H.Liang C.j.Lin G.L.Lin S.Lin j.j.Ling j.M.Link26 L.Littenberg B.R.Littlejohn j.C.Liu j.L.Liu j.X.Liu C.Lu H.Q.Lu K.B.Luk B.Z.Ma X.B.Ma X.Y.Ma Y.Q.Ma R.C.Mandujano C.Marshall K.T.McDonald R.D.McKeown Y.Meng j.Napolitano D.Naumov E.Naumova T.M.T.Nguyen j.P.Ochoa-Ricoux A.Olshevskiy H.-R.Pan j.Park S.Patton j.C.Peng C.S.j.Pun F.Z.Qi M.Qi X.Qian N.Raper j.Ren C.Morales Reveco R.Rosero B.Roskovec X.C.Ruan H.Steiner j.L.Sun T.Tmej1 K.Treskov W.-H.Tse C.E.Tull B.Viren V.Vorobel C.H.Wang j.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.j.Wen K.Whisnant C.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.j.Wu D.M.Xia Z.Q.Xie Z.Z.Xing H.K.Xu j.L.Xu T.Xu T.Xue C.G.Yang L.Yang Y.Z.Yang H.F.Yao M.Ye M.Yeh B.L.Young H.Z.Yu Z.Y.Yu B.B.Yue V.Zavadskyi S.Zeng Y.Zeng L.Zhan C.Zhang F.Y.Zhang H.H.Zhang j.W.Zhang Q.M.Zhang S.Q.Zhang X.T.Zhang Y.M.Zhang Y.X.Zhang Y.Y.Zhang Z.j.Zhang Z.P.Zhang Z.Y.Zhang j.Zhao R.Z.Zhao L.Zhou H.L.Zhuang j.H.Zou Institute of Modern Physics East China University of Science and TechnologyShanghai 200337 University of Wisconsin MadisonWisconsin 53706 Brookhaven National Laboratory UptonNew York 11973 Department of Physics Nnational Taiwan UniversityTaipei Institute of High Energy Physics Beijing 100049 National United University Miao-Li Department of Engineering Physics Tsinghua UniversityBeijing 100048 Shenzhen University Shenzhen 518061 Sun Yat-Sen(Zhongshan)University Guangzhou 510275 North China Electric Power University Beijing 102206 Chinese University of Hong Kong Hongkong 999077 Siena College LoudonvilleNew York 12211 Department of Physics and Astronomy University of CaliforniaIrvineCalifornia 92697 University of Science and Technology of China Hefei 230022 Charles University Faculty of Mathematics and PhysicsPrague joint Institute for Nuclear Research DubnaMoscow Region Department of Physics University of Illinois at Urbana-ChampaignUrbanaIllinois 61801 Lawrence Berkeley National Laboratory BerkeleyCalifornia 94720 Department of Physics Illinois Institute of TechnologyChicagoIllinois 60616 Beijing Normal University Beijing 100875 Department of Nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049 Wright Laboratory and Department of Physics Yale UniversityNew HavenConnecticut 06520 China Institute of Atomic Energy Beijing 102413 Shandong University Jinan 250002 Guangxi University No.100 Daxue East RoadNanning 530004 Center for Neutrino Physics Virginia TechBlacksburgVirginia 24061 Institute of Physics NCTUHsinchu Department of Physics University of CincinnatiCincinnatiOhio 45221 Department of Physics College of Science and TechnologyTemple UniversityPhiladelphiaPennsylvania 19122 Dongguan University of Technology Dongguan 523808 Department of Physics University of CaliforniaBerkeleyCalifornia 94720 Department of Physics The University of Hong KongPokfulamHongkong 999077 School of Physics Nankai UniversityTianjin 300071 Department o

The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision *** positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the Daya Bay experiment,in combination with the fission rates of fissile isotopes in the reactor,is used to extract the positron energy spectra resulting from the fission of specific *** information can be used to produce a precise,data-based prediction of the antineutrino energy spectrum in other reactor antineutrino experiments with different fission fractions than Daya *** positron energy spectra are unfolded to obtain the antineutrino energy spectra by removing the contribution from detector response with the Wiener-SVD unfolding *** results are obtained with other unfolding methods.A technique to construct a data-based prediction of the reactor antineutrino energy spectrum is proposed and *** the reactor fission fractions,the technique can predict the energy spectrum to a 2%*** addition,we illustrate how to perform a rigorous comparison between the unfolded antineutrino spectrum and a theoretical model prediction that avoids the input model bias of the unfolding method.

关键词： reactor antineutrino energy spectrum Daya Bay application

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Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

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Chinese Physics C 2017年第1期41卷 11-46页

作者：安丰鹏 A.B.Balantekin H.R.Band M.Bishai S.Blyth 曹德文曹国富曹俊岑吴镕陳日朗常劲帆張立楚张昀陈和生陈泉佑陈少敏陈义学陈羽程佳樺程捷程雅苹成兆侃 j.j.Cherwinka 朱明中 A.Chukanov j.P.Cummings j.de Arcos 邓子艳丁雪峰丁雅韵 M.V.Diwan M.Dolgareva j.dove D.A.Dwyer W.R.Edwards R.Gill M.Gonchar 龚光华宫辉 M.Grassi 顾文强关梦云郭磊郭如盼郭新恒郭子溢 R.W.Hackenburg 韩然 S.Hans 何苗 K.M.Heeger 衡月昆 A.Higuera Y.K.Hor 熊怡胡貝禎胡涛胡维黄恩泉黄翰雄黄性涛 P.Huber 霍文驹 G.Hussain D.E.jaffe P.jaffke 任國綸 S.jetter 季向盼季筱璐焦健斌 R.A.johnson D.jones j.joshi 康丽 S.H.Kettell S.Kohn M.Kramer 關健强郭文伟郭天能 T.j.Langford K.Lau L.Lebanowski j.Lee 李曉菁雷瑞庭 R.Leitner 李超李登杰李飞李高嵩李秋菊黎山峰 S.C.Li 李卫东李小男李玉峰李志兵梁昊林政儒林贵林林盛鑫林士凱林禹丞凌家杰 j.M.Link L.Littenberg B.R.Littlejohn 刘大为刘江来刘金昌 C.W.Loh 陆昌国路浩奇陆稼书陆锦标吕志鹏马秋梅马晓妍马续波马宇倩 Y.Malyshkin D.A.Martinez Caicedo K.T.McDonald R.D.McKeown I.Mitchell M.Mooney Y.Nakajima j.Napolitano D.Naumov E.Naumova 倪浩然宁哲 j.P.Ochoa-Ricoux A.Olshevskiy 潘孝儒 j.Park S.Patton V.Pec 彭仁杰 L.Pinsky 潘振声齐法制祁鸣钱鑫 N.Raper 任杰 R.Rosero B.Roskovec 阮锡超 H.Steiner 孙功星孙吉良唐炜 D.Taychenachev K.TVeskov K.V.Tsang C.E.Tull N.Viaux B.Viren V.Vorobei 王正祥王萌王乃彦王瑞光王为王玺王贻芳王喆王铮王志民魏瀚宇温良剑 K.Whisnant C.G.White L.Whitehead T.Wise 黄显诺黄振辉 E.Worcester 吳珈豪吴群吴文杰夏冬梅夏经凯邢志忠徐建一徐吉磊徐晔薛涛杨长根杨海波杨雷阳马生杨梦婷叶梅 Z.Ye 叶铭芳杨炳麟于泽源曾珊占亮张超张宏浩张家文张清民张玄同张一鸣张一心张玉美张志坚张智勇张子平赵洁赵庆旺赵豫斌钟玮丽周莉 N.Zhou 庄红林邹佳恒 Institute of Modern Physics East China University of Science and Technology University of Wisconsin Department of Physics Yale University Brookhaven National Laboratory Department of Physics National Taiwan University National United University Nanjing University Institute of High Energy Physics Chinese University of Hong Kong Institute of Physics National Chiao-Tung University Shandong University Department of Engineering Physics Tsinghua University North China Electric Power University Shenzhen University Sun Yat-Sen (Zhongshan) University joint Institute for Nuclear Research Siena College Department of Physics Illinois Institute of Technology Department of Physics University of Illinois at Urbana-Champaign Lawrence Berkeley National Laboratory Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Beijing Normal University Department of Chemistry and Chemical Technology Bronx Community College Department of Physics University of Houston Center for Neutrino Physics Virginia Tech China Institute of Atomic Energy University of Science and Technology of China School of Physics Nankai University Department of Physics University of Cincinnati Department of Physics College of Science and Technology Temple University Dongguan University of Technology Department of Physics University of California Department of Physics The University of Hong Kong Charles University Faculty of Mathematics and Physics joseph Henry Laboratories Princeton University Department of Nuclear Science and Technology School of Energy and Power Engineering Xi’an Jiaotong University Instituto de F'?sica Pontificia Universidad Católica de Chile California Institute of Technology College of William and Mary Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute China General Nuclear Power Group College of Electronic Science and Engineering National University of Defense Technology Iowa State University Chongqing University

A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near（560 m and 600 m flux-weighted baselines） and one far（1640 m flux-weighted baseline） underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay（IBD） candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020（0.992±0.021） for the Huber＋Mueller（ILL＋Vogel） model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4–6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

关键词： antineutrino flux energy spectrum reactor Daya Bay

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Effect of phytase on phosphorous balance in 20-kg barrows fed low or adequate phosphorous diets

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Animal Nutrition 2020年第1期6卷 9-15页

作者： Tsung Cheng Tsai Robert dove Michael R.Bedford Michael j.Azain Animal&Dairy Science Department University of GeorgiaAthensGA 30602United States AB-VISTA Feed Ingredients MarlboroughWiltsMG SN84ANUnited Kingdom Department of Animal Science University of ArkansasFayettevilleAR 72701United States

The effects of phytase on phosphorus(P)digestibility are well ***,there are few studies that report P balance,particularly when phytase is used in diets that have adequate or deficient *** main objective of the study was to determine the effect of dietary P levels and exogenous phytase on P balance in growing *** first part of the experiment was a 14-d metabolism study conducted with 80 barrows(initial body weight 18.5±0.5 kg)with a 2 x 5 factorial arrangement of treatments and main effects of available P(0.13%available P,low P[Low-P]diet;0.35%available P,adequate P[Adeq-P]diet)and phytase(0,250,500,2,500,and 12,500 U/kg).A portion of the pigs(n=24)fed the Low-P diet,with0,500,2,500,12,500 U/kg phytase,and those fed the Adeq-P diet,with 0 and 12,500 U/kg phytase,remained on test diets for another 4 d,and tissues were collected for determination of bone characteristics and tissue P *** was a P×phytase interaction for P retention that was accounted for by a lack of re sponse to phytase in pigs fed the Adeq-P *** of P was greater with incremental levels of phytase in pigs fed Low-P diets as compared to those fed Adeq-P diets(P level x phytase,P<0.01),but calcium(Ca)retention was greater in pigs fed Adeq-P diets(P level x phytase P<0.01).Apparent total tract digestibility(ATTD)of P was improved by phytase(P<0.001)and was greater in pigs fed Adeq-P diets as compared to those fed Low-P diets(P=0.006).Metatarsal bone ash(quadratic,P=0.01)and strength(linear,P=0.03)was increased by phytase addition to the Low-P *** were no phytase or dietary P effects on P concentrations of the heart,kidney,liver,muscle,and *** results suggest that as compared to the effects in an Adeq-P diet,adding phytase to a Low-P diet was more effective at reducing the P and Ca excretion and restoring average daily gain(ADG).The P released by phytase is absorbed and contributes to improved bone growth,greater rates of tissue accretion,a

关键词： Phosphorous Phytase Bone Calcium Digestibility Tissue

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Excellent strength-ductility combination in Co_(36)Cr_(15)Fe_(18)Ni_(18)Al_(8)Ti_(4)Mo_(1)multi-principal element alloys by dual-morphology B2 precipitates strengthening

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journal of Materials Science & Technology 2023年第3期134卷 60-66页

作者： X.S.Liu R.Li X.F.Fan Q.Q.Liu X.Tong A.X.Li S.Xu H.Yang S.B.Yu M.H.jiang C.Huo P.F.Yu M.T.dove G.Li State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China College of Computer Science Sichuan UniversityChengdu 610065China School of Physical and Chemical Sciences Queen Mary University of LondonMile End RoadLondon E14NSUnited Kingdom School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

Precipitation strengthening provides one of the most widely-used mechanisms for strengthen-ing multi-principal-element alloys(MPEAs).Here,we report dual-morphology B2 precipitates in Co_(36)Cr_(15)Fe_(18)Ni_(18)Al_(8)Ti_(4)Mo_(1)MPEA obtained by thermo-mechanical *** microscopy charac-terization reveals that the dual-morphology B2 precipitates are either recrystallized B2 particles formed at the grain boundaries or triple junctions with recrystallization process,or rod-like within the non-recrystallized FCC *** dual-morphology B2 precipitates enhance the yield strength and ultimate tensile strength up to 1120 MPa and 1480 MPa,*** work suggests the mechanical proper-ties of the alloy can be optimized by B2 precipitation strengthening to meet the needs of engineering applications.

关键词： Multi-principal element alloys B2 precipitates Heterogeneous nucleation Precipitation strengthening

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苏云金芽孢杆菌以色列亚种P19基因的初步研究

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微生物学报 1999年第2期39卷 114-119页

作者：刘子铎孙明喻子牛 ZaritskyA Ben-dove ManasherobR 华中农业大学农业微生物重点开放实验室微生物科学技术系

以含有Ｐ１９和ｃｙｔ１Ａ基因的以色列亚种７２ＭＤ质粒的９７ｋｂＨｉｎｄⅢ片段为模板进行ＰＣＲ扩增，分别获得Ｐ１９基因和ｃｙｔ１Ａ基因片段。与表达载体ｐＵＨＥ２４连接转化大肠杆菌ＸＬ１，获得３个克隆株。ＬＺ１９含有... 详细信息

以含有Ｐ１９和ｃｙｔ１Ａ基因的以色列亚种７２ＭＤ质粒的９７ｋｂＨｉｎｄⅢ片段为模板进行ＰＣＲ扩增，分别获得Ｐ１９基因和ｃｙｔ１Ａ基因片段。与表达载体ｐＵＨＥ２４连接转化大肠杆菌ＸＬ１，获得３个克隆株。ＬＺ１９含有Ｐ１９基因；ｐＬＺｃｙｔ１Ａ含有ｃｙｔ１Ａ基因；ＬＺ１９Ａ含有Ｐ１９和ｃｙｔ１Ａ两个基因。利用ｃｙｔ１Ａ蛋白质可使大肠杆菌细胞致死的特性，在ＩＰＴＧ诱导下，测定了各克隆基因表达对大肠杆菌有致死作用；ｐＬＺ１９Ａ对大肠杆菌的起始致死作用明显快于ｐＬＺｃｙｔ１Ａ，这种现象可能是Ｐ１９基因促进ｃｙｔ１Ａ基因高表达的结果。

关键词：苏云金牙孢杆菌以色列亚种 P19基因 cyt1A基因

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有结肠直肠癌家族史的患者行结肠镜监测预防结肠直肠癌:一项为期16年的前瞻性、随访研究

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世界核心医学期刊文摘（胃肠病学分册） 2006年第3期2卷 2-3页

作者： dove-Edwin I. Sasieni P. Adams j. Thomas H.j.W. 李宏宇 Cancer Research UK Centre for Epidemiology Mathematics and StatisticsWolfson Institute of Preventive Medicine London EC1M 6BQ Germany.Prof

Objective: To determine to what extent individuals with various family histories of colorectal cancer (from one to three or more affected first degree relatives) benefit from colonoscopic surveillance. Design: Prospective, observational study of high risk families, followed up over 16 years. Setting: Tertiary referral family cancer clinic in London. Participants: 1678 individuals from families registered with die clinic. Individuals were classified according to die strength of their family history: hereditary non-polyposis colorectal cancer (if they fulfilled the Amsterdam criteria), and one, two, or three affected first degree relatives (moderate risk). Interventions: Colonoscopy was initially offered at five year intervals or three year intervals if an adenoma was detected. Main outcome measures: The incidence of adenomas with high risk pathological features or cancer. This was analysed by age, the extent of the family history, and findings on previous colonoscopies. The cohort was flagged for cancer and death. Incidence of colorectal cancer and mortality during over 15 000 person years of follow-up were compared with those expected in the absence of surveillance. Results: High risk adenomas and cancer were most common in families with hereditary non-polyposis colorectal cancer (on initial colonoscopy 5.7%and 0.9%, respectively). In the families with moderate risk, these findings were particularly uncommon under age 45 (1.1%and 0%) and on follow-up colonoscopy if advanced neoplasia was absent initially (1.7%and 0.1%). The incidence of colorectal cancer was substantially lower-80%in families with moderate risk (P = 0.00004), and 43%in families with hereditary non-polyposis colorectal cancer (P = 0.06) than the expected incidence in the absence of surveillance when the family history was taken into account. Conclusions: Colonoscopic surveillance reduces the risk of colorectal cancer in people with a strong family history. This study confirms that members of families

关键词：结肠直肠癌结肠镜检随访研究高危腺瘤预后指标患病风险一级亲属观察随访癌发生率成员需要

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微量元素对生长猪日粮中维生素E稳定性的影响

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内蒙古畜牧科学 1992年第4期13卷 43-45页

作者： C.R.dove R.C.Ewan 金光明

饲料成分中的天然生育酚水乎受到加工和贮存等有关环境条件的影响(如:磨碎、水分含量、不饱和脂肪含量、温度、湿度和氧化等).Young等报导高水分玉米中天然生育酚的氧化率较低水分玉米高,原因是脂肪过度氧化;Hakkanainen等报导在高水分... 详细信息

饲料成分中的天然生育酚水乎受到加工和贮存等有关环境条件的影响(如:磨碎、水分含量、不饱和脂肪含量、温度、湿度和氧化等).Young等报导高水分玉米中天然生育酚的氧化率较低水分玉米高,原因是脂肪过度氧化;Hakkanainen等报导在高水分大麦中具有同样的结果,他们发现高水分大麦在厌氧条件下贮存会降低生育酚的氧化率.

关键词：猪生长猪饲料微量元素维生素E

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齿状突无菌性坏死

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颈肩腰腿痛防治通讯 1984年第1期 24-24页

作者：王儒敬 dove j

Tredwell(1975)第一次报导了颅盆牵引后齿状突无菌性坏死。本文报导一组83例病人使用颅盆牵引后随诊5年以上(平均

关键词：齿状突无菌性颅盆牵引

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Highly divergent sympatric lineages of Leptotila verreauxi(Aves:Columbidae)suggest a secondary contact area in the Isthmus of Tehuantepec,Mexico

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Avian Research 2024年第1期15卷 12-21页

作者： Orlando j.Espinosa-Chávez Adolfo G.Navarro-Sigüenza Hernando Rodríguez-Correa Luis A.Sánchez-González Museo de Zoología“Alfonso L.Herrera” Depto.de Biología EvolutivaFacultad de CienciasUniversidad Nacional Autonoma de MexicoApdo.Postal 70-399CP 04510Ciudad de MexicoMexico Posgrado en Ciencias Biologicas Unidad de PosgradoEdificio D1◦PisoCircuito de PosgradosCiudad UniversitariaUniversidad Nacional Autonoma de MexicoCoyoacanCP 04510CDMXMexico Escuela Nacional de Estudios Superiores Unidad Morelia Universidad Nacional Autonoma de Mexico.Antigua Carretera a Patzcuaro No.8701 Col.Ex Hacienda de San Jose de la HuertaC.P.58190MoreliaMichoacanMexico

Due to a complex geological and biotic history,the Isthmus of Tehuantepec(IT),has been long recognized as a driver for the evolutionary divergence of numerous lowland and highland *** distributed in the lowlands of the American continent,the White-Tipped dove(Leptotila verreauxi)is a polytypic species with 13 recognized *** of these have been recorded in Mexico,and the distribution of three abuts at the IT,suggesting a contact *** estimate phylogenetic patterns,divergence times and genetic differentiation,we examined two mt DNA(ND2 and COI)and one n DNA(β-fibint 7)*** also used correlative ecological niche models(ENM)to assess whether ecological differences across the IT may have acted as a biogeographical *** estimated paleodistributions during the Middle Holocene,Last Glacial Maximum and Last Interglacial,to evaluate the influence of climate changes on the distribution and demographic *** results showed genetically distinct lineages that diverged approximately 2.5 million years *** and ecological factors may have played a dual role in promoting differentiation,but also in the formation of a secondary contact zone in the southern *** ecological niche comparisons indicated that the ecological niche of sympatric lineages at the IT are not identical,suggesting niches divergence;in addition,environmental niche models across the region indicated no abrupt biogeographic barriers,but the presence of regions with low *** results suggest that genetic differentiation originated by a vicariant event probably related to environmental factors,favored the evolution of different ecological ***,the absence of a biogeographic barrier but the presence of less suitable areas in the contact regions,suggest that secondary contact zones may be also maintained by climatic factors for the eastern group,but also by biotic interactions for the western group.

关键词： Biogeographical boundary Humid and dry forests Isthmus of Tehuantepec Phylogeography Secondary contact

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