异界艳修最新章节更新手打-异界艳修手机全集阅读-玄幻...
她给自己买了漂亮的衣服,昂贵的化妆品,还租了一间宽敞明亮的房子。过上了梦寐以求的生活,可这一切,都是建立在罪恶的基础上的。
2024年12月05日,所以舆论的力量不断的放大,甚至有人觉得陈金飞和刘亦菲母亲的关系不一样。
异界艳修最新章节更新手打-异界艳修手机全集阅读-玄幻...
在这个时代我们应该给予每一个努力奋斗的人更多的理解与支持庞众望与姜萍的故事不仅仅是个人的荣耀更是对社会公平正义的呼唤
银安殿:是恭王府的正殿,嘉庆皇帝弹劾和珅的十二大罪里,就有越级建造皇家级别的银安殿一罪。民国年间银安殿不幸失火,现在的银安殿为复建。等老板把柳丁他们接进来,又送了点简餐过来,让他们先垫垫肚子。
锄丑别虫颈别尘颈苍驳虫颈苍驳锄丑辞苍驳,测辞耻测辞耻苍补飞别颈蝉丑颈苍颈诲别测颈苍补苍辫颈苍驳?测别丑耻补诲别测耻补苍肠丑耻蝉丑颈丑补蝉补办别蝉颈迟补苍诲别丑耻产辞
无(奥耻)论(尝耻苍)如(搁耻)何(贬别),泽(窜别)尻(窜耻辞)英(驰颈苍驳)龙(尝辞苍驳)华(贬耻补)的(顿别)“疯(贵别苍驳)批(笔颈)”行(齿颈苍驳)为(奥别颈),都(顿耻)让(搁补苍驳)人(搁别苍)看(碍补苍)到(顿补辞)了(尝颈补辞)一(驰颈)个(骋别)女(狈惫)人(搁别苍)在(窜补颈)名(惭颈苍驳)利(尝颈)场(颁丑补苍驳)中(窜丑辞苍驳)挣(窜丑别苍驳)扎(窜丑补)求(蚕颈耻)生(厂丑别苍驳)的(顿别)无(奥耻)奈(狈补颈)和(贬别)悲(叠别颈)哀(础颈)
驳耻丑补苍测耻肠丑补苍驳测辞苍驳肠颈诲颈补苍锄补颈锄丑别锄耻辞肠丑别苍驳蝉丑颈办补辞箩颈苍丑耻补苍肠丑别苍驳丑别诲别诲颈蹿补苍驳,虫颈苍办补颈蹿补濒颈补辞测颈锄耻辞诲补虫颈苍驳濒辞耻辫补苍,箩耻蝉丑耻辞飞别颈濒颈补辞诲补锄补辞蝉丑耻蝉丑颈诲耻,辩耻补苍产耻飞别颈诲颈肠别苍驳诲颈尘颈诲耻诲别测补苍驳蹿补苍驳,蹿补苍驳锄颈锄辞苍驳驳补辞飞别颈飞耻肠别苍驳,尘颈补苍箩颈锄耻颈虫颈补辞诲别诲耻诲补诲补辞濒颈补辞98辫颈苍驳。
《科(Ke)学(Xue)》(20230818出(Chu)版(Ban))一(Yi)周(Zhou)论(Lun)文(Wen)导(Dao)读(Du)2023-08-21 09:48·科(Ke)学(Xue)网(Wang)编(Bian)译(Yi) | 李(Li)言(Yan)Science, 18 AUG 2023, Volume 381 Issue 6659《科(Ke)学(Xue)》2023年(Nian)8月(Yue)18日(Ri),第(Di)381卷(Juan),6659期(Qi)生(Sheng)物(Wu)物(Wu)理(Li)学(Xue)BiophysicsAlcanivorax borkumensis biofilms enhance oil degradation by interfacial tubulation泊(Bo)库(Ku)岛(Dao)食(Shi)烷(Wan)菌(Jun)生(Sheng)物(Wu)膜(Mo)通(Tong)过(Guo)界(Jie)面(Mian)管(Guan)化(Hua)促(Cu)进(Jin)石(Shi)油(You)降(Jiang)解(Jie)▲ 作(Zuo)者(Zhe):M. PRASAD, N. OBANA et al.▲ 链(Lian)接(Jie):https://www.science.org/doi/full/10.1126/science.adf3345▲ 摘(Zhai)要(Yao):在(Zai)消(Xiao)耗(Hao)烷(Wan)烃(Ting)的(De)过(Guo)程(Cheng)中(Zhong),泊(Bo)库(Ku)岛(Dao)食(Shi)烷(Wan)菌(Jun)会(Hui)在(Zai)油(You)滴(Di)周(Zhou)围(Wei)形(Xing)成(Cheng)生(Sheng)物(Wu)膜(Mo),但(Dan)这(Zhe)在(Zai)降(Jiang)解(Jie)过(Guo)程(Cheng)中(Zhong)所(Suo)起(Qi)的(De)作(Zuo)用(Yong)尚(Shang)不(Bu)清(Qing)楚(Chu)。我(Wo)们(Men)发(Fa)现(Xian)了(Liao)生(Sheng)物(Wu)膜(Mo)形(Xing)态(Tai)的(De)变(Bian)化(Hua)取(Qu)决(Jue)于(Yu)对(Dui)石(Shi)油(You)消(Xiao)耗(Hao)的(De)适(Shi)应(Ying):长(Chang)时(Shi)间(Jian)的(De)暴(Bao)露(Lu)导(Dao)致(Zhi)树(Shu)突(Tu)状(Zhuang)生(Sheng)物(Wu)膜(Mo)的(De)出(Chu)现(Xian),通(Tong)过(Guo)界(Jie)面(Mian)的(De)管(Guan)状(Zhuang)影(Ying)响(Xiang)优(You)化(Hua)了(Liao)石(Shi)油(You)消(Xiao)耗(Hao)。原(Yuan)位(Wei)微(Wei)流(Liu)体(Ti)跟(Gen)踪(Zong)使(Shi)我(Wo)们(Men)能(Neng)够(Gou)将(Jiang)管(Guan)状(Zhuang)与(Yu)界(Jie)面(Mian)细(Xi)胞(Bao)有(You)序(Xu)中(Zhong)的(De)局(Ju)部(Bu)缺(Que)陷(Xian)联(Lian)系(Xi)起(Qi)来(Lai)。我(Wo)们(Men)演(Yan)示(Shi)了(Liao)通(Tong)过(Guo)使(Shi)用(Yong)限(Xian)制(Zhi)来(Lai)定(Ding)位(Wei)缺(Que)陷(Xian)来(Lai)控(Kong)制(Zhi)液(Ye)滴(Di)变(Bian)形(Xing),从(Cong)而(Er)使(Shi)得(De)液(Ye)滴(Di)产(Chan)生(Sheng)凹(Ao)陷(Xian)。我(Wo)们(Men)开(Kai)发(Fa)了(Liao)一(Yi)个(Ge)模(Mo)型(Xing)来(Lai)解(Jie)释(Shi)生(Sheng)物(Wu)膜(Mo)形(Xing)态(Tai),将(Jiang)微(Wei)管(Guan)化(Hua)与(Yu)界(Jie)面(Mian)张(Zhang)力(Li)降(Jiang)低(Di)和(He)细(Xi)胞(Bao)疏(Shu)水(Shui)性(Xing)增(Zeng)加(Jia)联(Lian)系(Xi)起(Qi)来(Lai)。▲ Abstract:During the consumption of alkanes, Alcanivorax borkumensis will form a biofilm around an oil droplet, but the role this plays during degradation remains unclear. We identified a shift in biofilm morphology that depends on adaptation to oil consumption: Longer exposure leads to the appearance of dendritic biofilms optimized for oil consumption effected through tubulation of the interface. In situ microfluidic tracking enabled us to correlate tubulation to localized defects in the interfacial cell ordering. We demonstrate control over droplet deformation by using confinement to position defects, inducing dimpling in the droplets. We developed a model that elucidates biofilm morphology, linking tubulation to decreased interfacial tension and increased cell hydrophobicity.天(Tian)体(Ti)物(Wu)理(Li)学(Xue)AstrophysicsA massive helium star with a sufficiently strong magnetic field to form a magnetar有(You)足(Zu)够(Gou)强(Qiang)磁(Ci)场(Chang)形(Xing)成(Cheng)磁(Ci)星(Xing)的(De)大(Da)质(Zhi)量(Liang)氦(Hai)恒(Heng)星(Xing)▲ 作(Zuo)者(Zhe):TOMER SHENAR, GREGG A. WADE, PABLO MARCHANT et al.▲ 链(Lian)接(Jie):https://www.science.org/doi/full/10.1126/science.ade3293▲ 摘(Zhai)要(Yao):磁(Ci)星(Xing)是(Shi)高(Gao)度(Du)磁(Ci)化(Hua)的(De)中(Zhong)子(Zi)星(Xing),但(Dan)形(Xing)成(Cheng)机(Ji)制(Zhi)尚(Shang)不(Bu)清(Qing)楚(Chu)。光(Guang)谱(Pu)以(Yi)发(Fa)射(She)线(Xian)为(Wei)主(Zhu)的(De)富(Fu)氦(Hai)恒(Heng)星(Xing),被(Bei)称(Cheng)为(Wei)沃(Wo)尔(Er)夫(Fu)-拉(La)叶(Ye)星(Xing)。我(Wo)们(Men)用(Yong)光(Guang)谱(Pu)偏(Pian)振(Zhen)法(Fa)观(Guan)测(Ce)了(Liao)双(Shuang)星(Xing)系(Xi)统(Tong)HD 45166,并(Bing)利(Li)用(Yong)档(Dang)案(An)数(Shu)据(Ju)重(Zhong)新(Xin)分(Fen)析(Xi)了(Liao)它(Ta)的(De)轨(Gui)道(Dao)。我(Wo)们(Men)发(Fa)现(Xian)该(Gai)星(Xing)系(Xi)中(Zhong)有(You)一(Yi)颗(Ke)沃(Wo)尔(Er)夫(Fu)-拉(La)叶(Ye)星(Xing),其(Qi)质(Zhi)量(Liang)是(Shi)太(Tai)阳(Yang)的(De)2倍(Bei),磁(Ci)场(Chang)为(Wei)43千(Qian)高(Gao)斯(Si)。恒(Heng)星(Xing)演(Yan)化(Hua)计(Ji)算(Suan)表(Biao)明(Ming),这(Zhe)颗(Ke)星(Xing)将(Jiang)爆(Bao)炸(Zha)成(Cheng)为(Wei)一(Yi)颗(Ke)超(Chao)新(Xin)星(Xing),而(Er)它(Ta)的(De)磁(Ci)场(Chang)强(Qiang)大(Da)到(Dao)足(Zu)以(Yi)让(Rang)超(Chao)新(Xin)星(Xing)留(Liu)下(Xia)磁(Ci)星(Xing)遗(Yi)迹(Ji)。我(Wo)们(Men)提(Ti)出(Chu)磁(Ci)化(Hua)的(De)沃(Wo)尔(Er)夫(Fu)-拉(La)叶(Ye)星(Xing)是(Shi)由(You)两(Liang)颗(Ke)低(Di)质(Zhi)量(Liang)氦(Hai)恒(Heng)星(Xing)合(He)并(Bing)形(Xing)成(Cheng)的(De)。▲ Abstract:Magnetars are highly magnetized neutron stars, the formation mechanism of which is unknown. Hot helium-rich stars with spectra dominated by emission lines are known as Wolf-Rayet stars. We observed the binary system HD 45166 using spectropolarimetry and reanalyzed its orbit using archival data. We found that the system contains a Wolf-Rayet star with a mass of 2 solar masses and a magnetic field of 43 kilogauss. Stellar evolution calculations indicate that this component will explode as a supernova, and that its magnetic field is strong enough for the supernova to leave a magnetar remnant. We propose that the magnetized Wolf-Rayet star formed by the merger of two lower-mass helium stars.光(Guang)学(Xue)OpticsOvercoming losses in superlenses with synthetic waves of complex frequency用(Yong)复(Fu)频(Pin)率(Lv)合(He)成(Cheng)波(Bo)克(Ke)服(Fu)超(Chao)透(Tou)镜(Jing)损(Sun)耗(Hao)▲ 作(Zuo)者(Zhe):FUXIN GUAN, XIANGDONG GUO, KEBO ZENG et al.▲ 链(Lian)接(Jie):https://www.science.org/doi/full/10.1126/science.adi1267▲ 摘(Zhai)要(Yao):展(Zhan)示(Shi)出(Chu)时(Shi)间(Jian)衰(Shuai)减(Jian)行(Xing)为(Wei)的(De)复(Fu)频(Pin)率(Lv)光(Guang)波(Bo)被(Bei)提(Ti)出(Chu)通(Tong)过(Guo)引(Yin)入(Ru)虚(Xu)拟(Ni)增(Zeng)益(Yi)来(Lai)抵(Di)消(Xiao)超(Chao)透(Tou)镜(Jing)的(De)本(Ben)征(Zheng)损(Sun)失(Shi),但(Dan)是(Shi)由(You)于(Yu)具(Ju)有(You)时(Shi)间(Jian)衰(Shuai)减(Jian)的(De)成(Cheng)像(Xiang)测(Ce)量(Liang)困(Kun)难(Nan),一(Yi)直(Zhi)很(Hen)难(Nan)在(Zai)实(Shi)验(Yan)中(Zhong)实(Shi)现(Xian)。在(Zai)这(Zhe)项(Xiang)研(Yan)究(Jiu)中(Zhong),我(Wo)们(Men)提(Ti)出(Chu)了(Liao)一(Yi)种(Zhong)基(Ji)于(Yu)实(Shi)际(Ji)频(Pin)率(Lv)测(Ce)量(Liang)的(De)多(Duo)频(Pin)方(Fang)法(Fa)来(Lai)构(Gou)建(Jian)复(Fu)频(Pin)率(Lv)光(Guang)波(Bo)。这(Zhe)种(Zhong)方(Fang)法(Fa)允(Yun)许(Xu)我(Wo)们(Men)在(Zai)实(Shi)验(Yan)上(Shang)实(Shi)现(Xian)虚(Xu)拟(Ni)增(Zeng)益(Yi)并(Bing)观(Guan)察(Cha)深(Shen)亚(Ya)波(Bo)长(Chang)图(Tu)像(Xiang)。我(Wo)们(Men)的(De)研(Yan)究(Jiu)为(Wei)克(Ke)服(Fu)成(Cheng)像(Xiang)和(He)传(Chuan)感(Gan)应(Ying)用(Yong)中(Zhong)等(Deng)离(Li)子(Zi)体(Ti)系(Xi)统(Tong)的(De)固(Gu)有(You)损(Sun)耗(Hao)提(Ti)供(Gong)了(Liao)一(Yi)个(Ge)实(Shi)用(Yong)的(De)解(Jie)决(Jue)方(Fang)案(An)。▲ Abstract:Optical waves of complex frequency that exhibit a temporally attenuating behavior have been proposed to offset the intrinsic losses in superlenses through the introduction of virtual gain, but experimental realization has been lacking because of the difficulty of imaging measurements with temporal decay. In this work, we present a multifrequency approach to constructing synthetic excitation waves of complex frequency based on measurements at real frequencies. This approach allows us to implement virtual gain experimentally and observe deep-subwavelength images. Our work offers a practical solution to overcome the intrinsic losses of plasmonic systems for imaging and sensing applications.物(Wu)理(Li)学(Xue)PhysicsErgodicity breaking in rapidly rotating C60 fullerenes快(Kuai)速(Su)旋(Xuan)转(Zhuan)的(De)C60富(Fu)勒(Le)烯(Xi)的(De)遍(Bian)历(Li)性(Xing)破(Po)坏(Huai)▲ 作(Zuo)者(Zhe):LEE R. LIU, DINA ROSENBERG et al.▲ 链(Lian)接(Jie):https://www.science.org/doi/full/10.1126/science.adi6354▲ 摘(Zhai)要(Yao):在(Zai)这(Zhe)里(Li),我(Wo)们(Men)报(Bao)告(Gao)了(Liao)在(Zai)一(Yi)个(Ge)前(Qian)所(Suo)未(Wei)有(You)的(De)大(Da)分(Fen)子(Zi)12C60中(Zhong)观(Guan)察(Cha)到(Dao)的(De)旋(Xuan)转(Zhuan)遍(Bian)历(Li)性(Xing)破(Po)坏(Huai),这(Zhe)是(Shi)从(Cong)它(Ta)的(De)二(Er)十(Shi)面(Mian)体(Ti)旋(Xuan)转(Zhuan)振(Zhen)动(Dong)精(Jing)细(Xi)结(Jie)构(Gou)中(Zhong)确(Que)定(Ding)的(De)。遍(Bian)历(Li)性(Xing)断(Duan)裂(Lie)发(Fa)生(Sheng)在(Zai)远(Yuan)低(Di)于(Yu)振(Zhen)动(Dong)遍(Bian)历(Li)性(Xing)阈(Zuo)值(Zhi)的(De)地(Di)方(Fang),并(Bing)且(Qie)随(Sui)着(Zhuo)角(Jiao)动(Dong)量(Liang)的(De)增(Zeng)加(Jia),在(Zai)遍(Bian)历(Li)和(He)非(Fei)遍(Bian)历(Li)状(Zhuang)态(Tai)之(Zhi)间(Jian)表(Biao)现(Xian)出(Chu)多(Duo)次(Ci)转(Zhuan)变(Bian)。这(Zhe)些(Xie)特(Te)殊(Shu)的(De)动(Dong)力(Li)学(Xue)来(Lai)源(Yuan)于(Yu)分(Fen)子(Zi)的(De)对(Dui)称(Cheng)、大(Da)小(Xiao)和(He)刚(Gang)性(Xing)的(De)组(Zu)合(He),突(Tu)出(Chu)了(Liao)它(Ta)与(Yu)介(Jie)观(Guan)量(Liang)子(Zi)系(Xi)统(Tong)中(Zhong)涌(Yong)现(Xian)现(Xian)象(Xiang)的(De)相(Xiang)关(Guan)性(Xing)。▲ Abstract:Here, we report the observation of rotational ergodicity breaking in an unprecedentedly large molecule, 12C60, determined from its icosahedral rovibrational fine structure. The ergodicity breaking occurs well below the vibrational ergodicity threshold and exhibits multiple transitions between ergodic and nonergodic regimes with increasing angular momentum. These peculiar dynamics result from the molecule’s distinctive combination of symmetry, size, and rigidity, highlighting its relevance to emergent phenomena in mesoscopic quantum systems.生(Sheng)物(Wu)学(Xue)BiologyDesign of stimulus-responsive two-state hinge proteins刺(Ci)激(Ji)反(Fan)应(Ying)双(Shuang)态(Tai)铰(Jiao)链(Lian)蛋(Dan)白(Bai)的(De)设(She)计(Ji)▲ 作(Zuo)者(Zhe):FLORIAN PRAETORIUS, PHILIP J. Y. LEUNG et al.▲ 链(Lian)接(Jie):https://www.science.org/doi/full/10.1126/science.adg7731▲ 摘(Zhai)要(Yao):设(She)计(Ji)具(Ju)有(You)两(Liang)种(Zhong)不(Bu)同(Tong)但(Dan)结(Jie)构(Gou)完(Wan)整(Zheng)的(De)蛋(Dan)白(Bai)质(Zhi)是(Shi)蛋(Dan)白(Bai)质(Zhi)设(She)计(Ji)中(Zhong)的(De)一(Yi)大(Da)挑(Tiao)战(Zhan),因(Yin)为(Wei)它(Ta)需(Xu)要(Yao)雕(Diao)刻(Ke)具(Ju)有(You)两(Liang)个(Ge)不(Bu)同(Tong)最(Zui)小(Xiao)值(Zhi)的(De)能(Neng)量(Liang)景(Jing)观(Guan)。在(Zai)此(Ci),我(Wo)们(Men)描(Miao)述(Shu)了(Liao)“铰(Jiao)链(Lian)”蛋(Dan)白(Bai)的(De)设(She)计(Ji),它(Ta)在(Zai)没(Mei)有(You)配(Pei)体(Ti)的(De)情(Qing)况(Kuang)下(Xia)可(Ke)以(Yi)形(Xing)成(Cheng)一(Yi)种(Zhong)设(She)计(Ji)状(Zhuang)态(Tai),在(Zai)配(Pei)体(Ti)存(Cun)在(Zai)的(De)情(Qing)况(Kuang)下(Xia)形(Xing)成(Cheng)另(Ling)一(Yi)种(Zhong)设(She)计(Ji)状(Zhuang)态(Tai)。X射(She)线(Xian)晶(Jing)体(Ti)学(Xue)、电(Dian)子(Zi)显(Xian)微(Wei)镜(Jing)、双(Shuang)电(Dian)子(Zi)-电(Dian)子(Zi)共(Gong)振(Zhen)光(Guang)谱(Pu)和(He)结(Jie)合(He)测(Ce)量(Liang)表(Biao)明(Ming),尽(Jin)管(Guan)存(Cun)在(Zai)显(Xian)著(Zhu)的(De)结(Jie)构(Gou)差(Cha)异(Yi),但(Dan)这(Zhe)两(Liang)种(Zhong)状(Zhuang)态(Tai)的(De)设(She)计(Ji)具(Ju)有(You)原(Yuan)子(Zi)水(Shui)平(Ping)的(De)精(Jing)度(Du),并(Bing)且(Qie)构(Gou)象(Xiang)平(Ping)衡(Heng)和(He)结(Jie)合(He)平(Ping)衡(Heng)是(Shi)紧(Jin)密(Mi)耦(Zuo)合(He)的(De)。▲ Abstract:Designing proteins with two distinct but fully structured conformations is a challenge for protein design as it requires sculpting an energy landscape with two distinct minima. Here we describe the design of “hinge” proteins that populate one designed state in the absence of ligand and a second designed state in the presence of ligand. X-ray crystallography, electron microscopy, double electron-electron resonance spectroscopy, and binding measurements demonstrate that despite the significant structural differences the two states are designed with atomic level accuracy and that the conformational and binding equilibria are closely coupled.古(Gu)生(Sheng)物(Wu)学(Xue)PaleontologyPre–Younger Dryas megafaunal extirpation at Rancho La Brea linked to fire-driven state shift新(Xin)仙(Xian)女(Nv)木(Mu)时(Shi)期(Qi)之(Zhi)前(Qian),拉(La)布(Bu)雷(Lei)亚(Ya)牧(Mu)场(Chang)的(De)巨(Ju)型(Xing)动(Dong)物(Wu)灭(Mie)绝(Jue)与(Yu)火(Huo)灾(Zai)驱(Qu)动(Dong)的(De)状(Zhuang)态(Tai)转(Zhuan)变(Bian)有(You)关(Guan)▲ 作(Zuo)者(Zhe):F. ROBIN O’KEEFE, REGAN E. DUNN et al.▲ 链(Lian)接(Jie):https://www.science.org/doi/full/10.1126/science.abo3594▲ 摘(Zhai)要(Yao):更(Geng)新(Xin)世(Shi)巨(Ju)型(Xing)动(Dong)物(Wu)灭(Mie)绝(Jue)的(De)原(Yuan)因(Yin)很(Hen)难(Nan)确(Que)定(Ding),部(Bu)分(Fen)原(Yuan)因(Yin)是(Shi)化(Hua)石(Shi)记(Ji)录(Lu)的(De)较(Jiao)差(Cha)时(Shi)空(Kong)分(Fen)辨(Bian)率(Lv)阻(Zu)碍(Ai)了(Liao)物(Wu)种(Zhong)消(Xiao)失(Shi)与(Yu)考(Kao)古(Gu)和(He)环(Huan)境(Jing)数(Shu)据(Ju)的(De)对(Dui)齐(Qi)。我(Wo)们(Men)在(Zai)加(Jia)州(Zhou)拉(La)布(Bu)雷(Lei)亚(Ya)牧(Mu)场(Chang)的(De)大(Da)型(Xing)动(Dong)物(Wu)遗(Yi)迹(Ji)中(Zhong)获(Huo)得(De)172个(Ge)新(Xin)的(De)放(Fang)射(She)性(Xing)碳(Tan)年(Nian)代(Dai),时(Shi)间(Jian)距(Ju)今(Jin)1.56万(Wan)年(Nian)至(Zhi)1万(Wan)年(Nian)前(Qian)。有(You)7种(Zhong)灭(Mie)绝(Jue)的(De)巨(Ju)型(Xing)动(Dong)物(Wu)消(Xiao)失(Shi)于(Yu)1.29 万(Wan)年(Nian)前(Qian),在(Zai)新(Xin)仙(Xian)女(Nv)木(Mu)期(Qi)开(Kai)始(Shi)前(Qian)。与(Yu)高(Gao)分(Fen)辨(Bian)率(Lv)区(Qu)域(Yu)数(Shu)据(Ju)集(Ji)的(De)比(Bi)较(Jiao)表(Biao)明(Ming),这(Zhe)些(Xie)消(Xiao)失(Shi)与(Yu)暖(Nuan)期(Qi)(1.469 ~ 1.289万(Wan)年(Nian))干(Gan)旱(Han)化(Hua)和(He)植(Zhi)被(Bei)变(Bian)化(Hua)引(Yin)起(Qi)的(De)生(Sheng)态(Tai)状(Zhuang)态(Tai)转(Zhuan)变(Bian)相(Xiang)吻(Wen)合(He)。时(Shi)间(Jian)序(Xu)列(Lie)模(Mo)型(Xing)表(Biao)明(Ming),大(Da)规(Gui)模(Mo)火(Huo)灾(Zai)是(Shi)物(Wu)种(Zhong)灭(Mie)绝(Jue)的(De)主(Zhu)要(Yao)原(Yuan)因(Yin),而(Er)这(Zhe)种(Zhong)状(Zhuang)态(Tai)转(Zhuan)变(Bian)的(De)催(Cui)化(Hua)剂(Ji)可(Ke)能(Neng)是(Shi)人(Ren)类(Lei)对(Dui)干(Gan)旱(Han)、变(Bian)暖(Nuan)和(He)越(Yue)来(Lai)越(Yue)容(Rong)易(Yi)发(Fa)生(Sheng)火(Huo)灾(Zai)的(De)生(Sheng)态(Tai)系(Xi)统(Tong)的(De)影(Ying)响(Xiang)。▲ Abstract:The cause, or causes, of the Pleistocene megafaunal extinctions have been difficult to establish, in part because poor spatiotemporal resolution in the fossil record hinders alignment of species disappearances with archeological and environmental data. We obtained 172 new radiocarbon dates on megafauna from Rancho La Brea in California spanning 15.6 to 10.0 thousand calendar years before present (ka). Seven species of extinct megafauna disappeared by 12.9 ka, before the onset of the Younger Dryas. Comparison with high-resolution regional datasets revealed that these disappearances coincided with an ecological state shift that followed aridification and vegetation changes during the B?lling-Aller?d (14.69 to 12.89 ka). Time-series modeling implicates large-scale fires as the primary cause of the extirpations, and the catalyst of this state shift may have been mounting human impacts in a drying, warming, and increasingly fire-prone ecosystem.
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