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Stepped-up development of accelerator mass spectrometry method for the detection of ^(60)Fe with the HI-13 tandem accelerator

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Nuclear Science and Techniques 2024年第4期35卷 136-143页

作者： Yang Zhang Sheng-Quan Yan Ming He Qing-Zhang Zhao Wen-Hui Zhang Chao-Xin Kan jian-Ming Zhou Kang-Ning Li Xiao-Fei wang jian-Cheng liu Zhao-Hua Peng Zhuo Liang Ai-Ling Li jian Zheng Qi-Wen Fan Yun-Ju Li you-Bao wang Zhi-Hong Li Yang-ping Shen Ding Nan Wei Nan Yu-Qiang Zhang Jia-Ying-Hao Li Jun-Wen Tian jiang-Lin Hou Chang-Xin Guo Zhi-Cheng Zhang Ming-Hao Zhu Yu-Wen Chen Yu-Chen jiang Tao Tian Jin-Long Ma Yi-Hui liu Jing-Yu Dong Run-Long liu Mei-Yue-Nan Ma Yong-Shou Chen Wei-ping liu Bing Guo China Institute of Atomic Energy P.O.Box 275(10)Beijing 102413China College of Science Southern University of Science and TechnologyShenzhen 518055China School of Physics Xi’an Jiaotong UniversityXi’an 710049China

The Moon provides a unique environment for investigating nearby astrophysical events such as *** samples retain valuable information from these events,via detectable long-lived“fingerprint”radionuclides such as^(60)*** this work,we stepped up the development of an accelerator mass spectrometry(AMS)method for detecting^(60)Fe using the HI-13tandem accelerator at the China Institute of Atomic Energy(CIAE).Since interferences could not be sufficiently removed solely with the existing magnetic systems of the tandem accelerator and the following Q3D magnetic spectrograph,a Wien filter with a maximum voltage of±60 kV and a maximum magnetic field of 0.3 T was installed after the accelerator magnetic systems to lower the detection background for the low abundance nuclide^(60)Fe.A 1μm thick Si_(3)N_(4) foil was installed in front of the Q3D as an energy *** particle detection,a multi-anode gas ionization chamber was mounted at the center of the focal plane of the ***,an^(60)Fe sample with an abundance of 1.125×10^(-10)was used to test the new AMS *** results indicate that^(60)Fe can be clearly distinguished from the isobar^(60)*** sensitivity was assessed to be better than 4.3×10^(-14)based on blank sample measurements lasting 5.8 h,and the sensitivity could,in principle,be expected to be approximately 2.5×10^(-15)when the data were accumulated for 100 h,which is feasible for future lunar sample measurements because the main contaminants were sufficiently separated.

关键词： Accelerator mass spectrometry Wien filter Isobar separation Supernovae Chang'e-5 lunar samples

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Diagnosis,treatment and prevention of severe acute respiratory syndrome coronavirus 2 infection in children:experts'consensus statement updatedforthe Omicron variant

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World Journal of Pediatrics 2024年第3期20卷 272-286页

作者： Rong-Meng jiang Zheng-De Xie Yi jiang Xiao-Xia Lu Run-Ming Jin Yue-Jie Zheng Yun-Xiao Shang Bao-ping Xu Zhi-Sheng liu Gen Lu Ji-Kui Deng Guang-Hua liu Xiao-Chuan wang jian-She wang Lu-Zhao Feng Wei liu Yi Zheng Sai-Nan Shu Min Lu Wan-Jun Luo Miao liu Yu-Xia Cui Le-ping Ye A-Dong Shen gang liu Li-Wei Gao Li-Juan Xiong Yan Bai Li-Kai Lin Zhuang Wei Feng-Xia Xue Tian-you wang Dong-Chi Zhao jian-Bo Shao Daniel Kwok-keung Ng Gary Wing-kin Wong Zheng-Yan Zhao Xing-wang Li Yong-Hong Yang Kun-Ling Shen Diagnosis and Treatment Center of Infectious Diseases Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China Beijing Key Laboratory of Pediatric Respiratory Infection Diseases Key Laboratory of Major Diseases in ChildrenMinistry of EducationNational Clinical Research Center for Respiratory DiseasesResearch Unit of Critical Infection in ChildrenChinese Academy of Medical Sciences2019RU016Laboratory of Infection and VirologyBeijing Pediatric Research InstituteBeijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing 100045China Department of Pediatrics Renmin Hospital of Wuhan UniversityWuhan 430060China Department of Respiratory Wuhan Children's HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430016China Department of Pediatrics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Respiratory Shenzhen Children's HospitalShenzhen 518038China Department of Pediatric Respiratory Shengjing Hospital Affiliated to China Medical UniversityShenyang 110004China Department of Respiratory Beijing Children's HospitalCapital Medical UniversityNational Clinical Research Center for Respiratory DiseasesNational Center for Children's HealthBeijing 100045China Department of Neurology Wuhan Children's HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430016China Department of Respiratory Guangzhou Women and Children's Medical CenterGuangzhou 510623China Department of Infectious Diseases Shenzhen Children's HospitalShenzhen 518038China Department of Pediatrics Fujian Branch of Shanghai Children's Medical CenterFujian Children's HospitalFuzhou350005China Department of Clinical Immunology and Allergy Children's Hospital of Fudan UniversityNational Center for Children's HealthShanghai 201102China Department of Infectious Diseases Children's Hospital of Fudan UniversityNational Center for Children's Health.Shanghai

It has been more than 3 years since the novel coronavirus(SARS-CoV-2)pandemic raged *** coronavirus disease 2019(COVID-19)has greatly influenced human *** to data from the World Health Organization(WHO),there were ove... 详细信息

关键词： prevention infection statement

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Stratigraphic framework and sedimentary evolution during the Cryogenian-Ediacaran transition in northeastern Sichuan Basin,South China

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Petroleum Science 2024年第2期21卷 823-835页

作者： Yi Zhang Hong-Wei Kuang Yong-Qing liu Qiang Shi Dong-Ge wang Ke-Ning Qi Yu-Chong wang Da-Wei Qiao Xiao-Shuai Chen Li-Zhi Wu Meng Tian Long Chen Yi Wei Liao-Yuan Song jian Li Zi-gang Wu Yun-Qian liu Xuan-Chun liu An-Qing Chen Zhi-Wei Liao Institute of Geology Chinese Academy of Geological SciencesBeijing100037China State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing400044China No.205 Geological Team Chongqing Bureau of Geology and Minerals ExplorationChongqing401121China Chongqing Institute of Geological Survey Chongqing401122China Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Chengdu University of TechnologyChengdu610059SichuanChina

The northeastern Sichuan area in the northern Yangtze margin has unique Ediacaran geological records,especially the Doushantuo Formation(DST),and become a hot research area in recent ***,the Cryogenian-Ediacaran(C-E)boundary has not been precisely identified,which restricts the in-depth study of geological information during this crucial transitional period and is unfavorable for a systematic and complete understanding of the Yangtze Block and even the global paleogeographic *** study conducted stratigraphy,sedimentology,and chronostratigraphy to establish the stratigraphic framework and sedimentary evolution of the C-E transition strata in northeastern *** results showed that the Ediacaran sediments,without the cap dolomite,unconformably overlaid the Cryogenian sediments in the studied *** Member II of the DST,characterized by 50-160 m of red-green sandstone(approximately equivalent to the original Chengkou“Guanyinya Formation”),directly overlaid the Cryogenian sediments and displayed a 623±2.3 Ma maximum depositional age from the detrital zircon U-Pb *** stratigraphic correlations indicate that the C-E transition strata in northeastern Sichuan had a consistent lithological association and sedimentary sequence characteristics but differed from the Three ***,the upper Nantuo massive glacial diamictites transition to the icebergs rafted lonestone-bearing mudstones at the top,then change upward to DST barrier coast *** proposed DST of the northeastern Sichuan Basin was divided into three lithostratigraphic members without the regional Member I cap dolomite:(i)Member II purple-red,gray-green sandstone strata,(ii)MemberⅢblack mudstone strata,and(iii)Member IV P-Mn bearing *** the C-E transition,the study area experienced(i)the global deglaciation stage in the terminal Marinoan glaciation and(ii)the filling-leveling up stage with clastic rocks in the early ***,the early Ediacaran

关键词： Marinoan glaciation Doushantuo formation Cap dolomite Deglacial and coastal deposits Detrital zircon U-Pb dating

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Risk Factors and Predictive Nomogram for Survival in Elderly Patients with Brain Glioma

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当代医学科学（英文） 2024年第4期44卷 759-770页

作者： Zhi-cheng FAN Wen-jian ZHAO Yang JIAO Shao-chun GUO Yun-peng KOU Min CHAO Na wang Chen-chen ZHOU Yuan wang Jing-hui liu Yu-long ZHAI Pei-gang JI Chao FAN Liang wang Department of Neurosurgery Tangdu HospitalFourth Military Medical UniversityXi'an 710038China Department of Neurosurgery Tangdu HospitalFourth Military Medical UniversityXi'an 710038China Department of Neurosurgery Shannxi University of Chinese MedineXianyang 712046China Department of Neurosurgery Tangdu HospitalFourth Military Medical UniversityXi'an 710038China Department of Neurosurgery Xi'an Medical UniversityXi'an 710021China

Objective:To determine the factors that contribute to the survival of elderly individuals diagnosed with brain glioma and develop a prognostic ***:Data from elderly individuals(age ≥65 years)histologically diagnosed with brain glioma were sourced from the Surveillance,Epidemiology,and End Results(SEER)*** dataset was randomly divided into a training cohort and an internal validation cohort at a 6:4 ***,data obtained from Tangdu Hospital constituted an external validation cohort for the *** identification of independent prognostic factors was achieved through the least absolute shrinkage and selection operator(LASSO)and multivariate Cox regression analysis,enabling the construction of a *** performance was evaluated using C-index,ROC curves,calibration plot and decision curve analysis(DCA).Results:A cohort of 20 483 elderly glioma patients was selected from the SEER *** prognostic factors(age,marital status,histological type,stage,and treatment)were found to significantly impact overall survival(OS)and cancer-specific survival(CSS),with tumor location emerging as a sixth variable independently linked to ***,nomogram models were developed to predict the probabilities of survival at 6,12,and 24 *** assessment findings from the validation queue indicate a that the model exhibited strong ***:Our nomograms serve as valuable prognostic tools for assessing the survival probability of elderly glioma *** can potentially assist in risk stratification and clinical decision-making.

关键词： Surveillance, Epidemiology, and End Results (SEER) elderly brain glioma nomogram prediction model prognosis

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Mental health and insomnia problems in healthcare workers after the COVID-19 pandemic:A multicenter cross-sectional study

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World Journal of Psychiatry 2024年第5期14卷 704-714页

作者： Wei Ding Min-Zhong wang Xian-Wei Zeng Zhen-Hua liu Yao Meng Hui-Ting Hu Yuan Zhang Yu-Guang Guan Fan-gang Meng jian-Guo Zhang Shu wang Department of Public Health Liaocheng People’s HospitalLiaocheng 252000Shandong ProvinceChina Department of Neurology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina Department of Neurosurgery Qilu Hospital of Shandong UniversityJinan 250012Shandong ProvinceChina Sleep Medicine Center Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250021Shandong ProvinceChina Department of Neurology The First Affiliated Hospital of Shandong First Medical UniversityJinan 250014Shandong ProvinceChina Department of Neurology Heze Mudan People’s HospitalHeze 274000Shandong ProvinceChina Neonatal Center Beijing Children's HospitalCapital Medical UniversityNational Center for Children's HealthBeijing 100045China Department of Neurosurgery SanBo Brain HospitalCapital Medical UniversityBeijing 100093China Department of Neurosurgery Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China

BACKGROUND Healthcare workers(HCWs)are at increased risk of contracting coronavirus disease 2019(COVID-19)as well as worsening mental health problems and *** problems can persist for a long period,even after the ***,less is known about this *** To analyze mental health,insomnia problems,and their influencing factors in HCWs after the COVID-19 *** This multicenter cross-sectional,hospital-based study was conducted from June 1,2023 to June 30,2023,which was a half-year after the end of the COVID-19 ***-stratified population-based cluster sampling was applied at the provincial level for Chinese *** such as anxiety,depression,and insomnia were evaluated by the Generalized Anxiety Disorder-7,Patient Health Questionnaire-9,and Insomnia Severity *** influencing the symptoms were identified by multivariable logistic *** A total of 2000 participants were invited,for a response rate of 70.6%.A total of 1412 HCWs[618(43.8%)doctors,583(41.3%)nurses and 211(14.9%)nonfrontline],254(18.0%),231(16.4%),and 289(20.5%)had symptoms of anxiety,depression,and insomnia,respectively;severe symptoms were found in 58(4.1%),49(3.5%),and 111(7.9%)of the ***,female sex,and hospitalization for COVID-19 were risk factors for anxiety,depression,and insomnia symptoms;moreover,death from family or friends was a risk factor for insomnia *** the COVID-19 outbreak,most[1086(76.9%)]of the participating HCWs received psychological interventions,while nearly all[994(70.4%)]of them had received public psychological *** 102(7.2%)of the HCWs received individual counseling from *** Although the mental health and sleep problems of HCWs were relieved after the COVID-19 pandemic,they still faced challenges and greater risks than did the general *** risk factors would help in providing targeted *** addition,although a major proportion of

关键词： COVID-19 Mental health Psychological symptoms Insomnia Sleep disorders Cross-sectional study Epidemiological study

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Comparative analysis of two digestive tract reconstruction methods in total laparoscopic radical total gastrectomy

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World Journal of Gastrointestinal Surgery 2024年第4期16卷 1109-1120页

作者： Tian-Xiang Dong Dong wang Qun Zhao Zhi-Dong Zhang Xue-Feng Zhao Bi-Bo Tan Yu liu Qing-Wei liu Pei-gang Yang ping-An Ding Tao Zheng Yong Li Zi-Jing liu Third Department of Surgery of the Fourth Hospital of Hebei Medical University Hebei Key Laboratory of Precision Diagnosis and Comprehensive Treatment of Gastric CancerShijiazhuang 050011Hebei ProvinceChina

BACKGROUND The incidence of gastric cancer has significantly increased in recent *** resection is the main treatment,but the method of digestive tract reconstruction after gastric cancer surgery remains *** the current study,we sought to explore a reasonable method of digestive tract reconstruction and improve the quality of life and nutritional status of patients after *** this end,we statistically analyzed the clinical results of patients with gastric cancer who underwent jejunal interposition double-tract reconstruction(DTR)and esophageal jejunum Roux-en-Y reconstruction(RY).AIM To explore the application effect of DTR in total laparoscopic radical total gastrectomy(TLTG)and evaluate its safety and *** We collected the relevant data of 77 patients who underwent TLTG at the Fourth Hospital of Hebei Medical University from October 2021 to January *** them,35 cases were treated with DTR,and the remaining 42 cases were treated with traditional *** 1:1 propensity score matching,the cases were grouped into 31 cases per group,with evenly distributed *** clinical characteristics and short-and long-term clinical outcomes of the two groups were statistically *** The two groups showed no significant differences in basic data,intraoperative blood loss,number of lymph node dissections,first defecation time after operation,postoperative hospital stay,postoperative complications,and laboratory examination results on the 1st,3rd,and 5th days after *** operation time of the DTR group was longer than that of the RY group[(307.58±65.14)min vs(272.45±62.09)min,P=0.016],but the first intake of liquid food in the DTR group was shorter than that in the RY group[(4.45±1.18)d vs(6.0±5.18)d,P=0.028].The incidence of reflux heartburn(Visick grade)and postoperative gallbladder disease in the DTR group was lower than that in the RY group(P=0.033 and P=0.038).Although there was no significant difference in bod

关键词： Gastric cancer Jejunal interposition double-tract reconstruction Roux-en-Y reconstruction Laparoscope

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Direct measurement of the break-out ^(19)F(p,γ)^(20)Ne reaction in the China Jinping underground laboratory(CJPL)

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Nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji Chen Hao Zhang Li‑Yong Zhang jian‑Jun He Richard James deBoer Michael Wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue Li jian‑Guo wang Long Zhang Fu‑Qiang Cao Zhi‑Cheng Zhang Xin‑Zhi jiang Luo‑Huan wang Zi‑Ming Li Lu‑Yang Song Liang‑Ting Sun Qi Wu Jia‑Qing Li Bao‑Qun Cui Li‑Hua Chen Rui‑gang Ma Er‑Tao Li gang Lian Yao‑De Sheng Zhi‑Hong Li Bing Guo Wei‑ping liu Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of Physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of Physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beams Michigan State UniversityEast LansingMI 48824USA Institute of Nuclear and Particle Physics and Department of Physics and Astronomy Ohio UniversityAthensOH 45701USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China China Institute of Atomic Energy Beijing 102413China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mathematics and Physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(19)F(p,γ)^(20) Ne reaction with respect to the competing ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the China Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass *** key resonance was observed at 225.2 keV for the first *** a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear ^(19)F(p,γ)^(20) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the ^(19)F(p,γ)^(20) Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate China Jinping underground laboratory(CJPL) JUNA

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Microwave electrometry with Rydberg atoms in a vapor cell using microwave amplitude modulation

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Chinese Physics B 2024年第5期33卷 65-74页

作者：郝建海贾凤东崔越王昱寒周飞刘修彬张剑谢锋白金海尤建琦王宇钟志萍 School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China Science and Technology on Metrology and Calibration Laboratory Changcheng Institute of Metrology & MeasurementAviation Industry Corporation of ChinaBeijing 100095China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We have theoretically and experimentally studied the dispersive signal of the Rydberg atomic electromagneticallyinduced transparency(EIT)Autler–Townes(AT)splitting spectra obtained using amplitude modulation of the microwave(MW)electric *** addition to the two zero-crossing points interval△f_(zeros),the dispersion signal has two positive maxima with an interval defined as the shoulder interval△f_(sho),which is theoretically expected to be used to measure a much weaker MW electric *** relationship of the MW field strength E_(MW)and△f_(sho)is experimentally studied at the MW frequencies of 31.6 GHz and 9.2 GHz *** results show that△f_(sho)can be used to characterize the much weaker E_(MW)than that of△f_(zeros)and the traditional EIT–AT splitting interval△f_(m);the minimum E_(MW)measured by△f_(sho)is about 30 times smaller than that by△f_(m).As an example,the minimum E_(MW)at 9.2 GHz that can be characterized by△f_(sho)is 0.056 mV/cm,which is the minimum value characterized by the frequency interval using a vapor cell without adding any auxiliary *** proposed method can improve the weak limit and sensitivity of E_(MW)measured by the spectral frequency interval,which is important in the direct measurement of weak E_(MW).

关键词： quantum sensor Rydberg atoms electromagnetically induced transparency amplitude modulation

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Cadherin-18 loss in prospermatogonia and spermatogonial stem cells enhances cell adhesion through a compensatory mechanism

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Zoological Research 2024年第5期45卷 1048-1060页

作者： Xiao-Xiao Li Dan-Chen Zhang Yan wang jian Wen Xing-Ju wang Yu-Lu Cao Ru jiang Jia-Rui Li Yi-Nuo Li He-He liu Wen-Hai Xie Zheng-Feng Xu ping Hu Kang Zou Germline Stem Cells and Microenvironment Lab College of Animal Science and TechnologyNanjing Agricultural UniversityNanjingJiangsu 210095China Stem Cell Research and Translation Center Nanjing Agricultural UniversityNanjingJiangsu 210095China School of Life Sciences and Medicine Shandong University of TechnologyZiboShandong 255000China Department of Prenatal Diagnosis Women’s Hospital of Nanjing Medical UniversityNanjing Maternity and Child Health Care HospitalNanjingJiangsu 210004China

Extracellular membrane proteins are crucial for mediating cell attachment,recognition,and signal transduction in the testicular microenvironment,particularly germline stem *** 18(CDH18),a type II classical cadherin,is primarily expressed in the nervous and reproductive ***,we investigated the expression of CDH18 in neonatal porcine prospermatogonia(ProSGs)and murine spermatogonial stem cells(SSCs).Disruption of CDH18 expression did not adversely affect cell morphology,proliferation,self-renewal,or differentiation in cultured porcine ProSGs,but enhanced cell adhesion and prolonged cell *** analysis indicated that the down-regulation of CDH18 in ProSGs significantly up-regulated genes and signaling pathways associated with cell *** further elucidate the function of CDH18 in germ cells,Cdh18 knockout mice were generated,which exhibited normal testicular morphology,histology,and *** analysis showed increased expression of genes associated with adhesion,consistent with the observations in porcine *** interaction of CDH18 withβ-catenin and JAK2 in both porcine ProSGs and murine SSCs suggested an inhibitory effect on the canonical Wnt and JAK-STAT signaling pathways during CDH18 ***,these findings highlight the crucial role of CDH18 in regulating cell adhesion in porcine ProSGs and mouse *** this regulatory mechanism provides significant insights into the testicular niche.

关键词： Extracellular signal Fertility Quiescency Wnt signaling pathway

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Identification of the cytochrome P450s responsible for the biosynthesis of two types of aporphine alkaloids and their de novo biosynthesis in yeast

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Journal of Integrative Plant Biology 2024年第8期66卷 1703-1717页

作者： Qishuang Li Xiang Jiao Xinyi Li Wenlong Shi Ying Ma Xiangmei Tan Jingyi Gan Jimei liu jian Yang jian wang Baolong Jin Tong Chen ping Su Yujun Zhao Yifeng Zhang Jinfu Tang Guanghong Cui Yun Chen Juan Guo Luqi Huang School of Traditional Chinese Pharmacy China Pharmaceutical UniversityNanjing 211198China State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs National Resource Center for Chinese Materia MedicaChina Academy of Chinese Medical SciencesBeijing 100700China Department of Life Sciences Chalmers University of TechnologyGothenburg SE-41296Sweden State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaThe Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China

Aporphine alkaloids have diverse pharmacological activities;however,our understanding of their biosynthesis is relatively *** studies have classified aporphine alkaloids into two categories based on the configuration and number of substituents of the D-ring and have proposed preliminary biosynthetic pathways for each *** this study,we identified two specific cytochrome P450 enzymes(CYP80G6 and CYP80Q5)with distinct activities toward(S)-configured and(R)-configured substrates from the herbaceous perennial vine Stephania tetrandra,shedding light on the biosynthetic mechanisms and stereochemical features of these two aporphine alkaloid ***,we characterized two CYP719C enzymes(CYP719C3 and CYP719C4)that catalyzed the formation of the methylenedioxy bridge,an essential pharmacophoric group,on the A-and D-rings,respectively,of aporphine *** the functional characterization of these crucial cytochrome P450 enzymes,we reconstructed the biosynthetic pathways for the two types of aporphine alkaloids in budding yeast(Saccharomyces cerevisiae)for the de novo production of compounds such as(R)-glaziovine,(S)-glaziovine,and *** study provides key insight into the biosynthesis of aporphine alkaloids and lays a foundation for producing these valuable compounds through synthetic biology.

关键词： aporphine alkaloids biosynthesis CYP719C CYP80 engineered yeast

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