COL4A2 enhances thyroid cancer cell proliferation through the AKT pathway

Objectives:Thyroid cancer(THCA)is the most common malignant tumor in endocrine system and the incidence has been increasing worldwide.And the number of patients dying from THCA has also gradually risen because the incidence continues to increase,so the mechanisms related to effective targets is necessary to improve the survival.This study was to preliminarily investigate the effects of the COL4A2 gene on the regulation of thyroid cancer(THCA)cell proliferation and the associated pathways.Methods:Bioinformatics analysis revealed that COL4A2 was closely associated with cancer development.COL4A2 expression in THCA tissues was analyzed using immunohistochemistry,and survival information was determined via Kaplan-Meier curves.The expression of COL4A2 and AKT pathway-related genes were analyzed using qPCR and western blot analyses.Colony formation as well as CCK-8 assays exhibited the cell proliferation level and cell activity,respectively.Downstream of COL4A2 was identified by Gene set enrichment analysis(GSEA).The effects of the COL4A2 and AKT pathways on THCA tumor growth in vivo were determined using a mouse model.Results:Bioinformatics analysis exhibited that COL4A2 plays a significant role in cancer and that the AKT pathway is downstream of COL4A2.THCA patients with high COL4A2 expression had shorter recurrence-free survival.Upregulation of COL4A2 gene expression in 2 THCA cell lines promoted tumor cell growth and activity.The use of AKT pathway blockers also restrained the growth and activity of the 2 THCA cell lines.The use of AKT pathway blockers reduced tumor volume and mass and prolonged mouse survival.Conclusions:COL4A2 can promote the growth as well as development of THCA through the AKT pathway and COL4A2 could be used as a target for THCA.

制造发展的三个范式:制造发展规律的研究

基于对人类社会发展历史和科学技术发展内在规律的认识,本文详细分析了制造发展的三个范式,论证了原子及近原子尺度制造是制造范式III的核心使能技术。文章回顾了国内外各机构对原子级制造研发规划现状,指出我国目前处于原子级制造技术发展的重要战略机遇期,并从设计、材料、加工和检测等角度分析了原子级制造的技术体系内涵;梳理了原子级表面制造、原子级结构制造、原子级测量与表征等领域的研究进展,呈现了当前具有原子级制造能力的部分代表性技术,包括原子级切削、原子级抛光、电化学加工、等离子体原子级加工技术、原子精准操控以及原子分辨测量与表征技术,并对原子级制造战略规划提出发展建议。

当归多糖促进骨髓移植重建受体小鼠造血功能

目的探讨当归多糖(ASP)调控骨髓基质细胞(BMSCs)促进供体骨髓移植(BMT)重建受体小鼠造血功能的机制。方法分离纯化8~10周龄雄性C57BL/6J小鼠骨髓单个核细胞(BMMNCs),移植给同龄同种雌性受体小鼠,第9天取受体鼠BMMNCs,再次移植给雌性受体小鼠。移植受体鼠分为对照组:假照射;辐射组:8.0 Gy X射线全身一次性照射;骨髓移植组:照射同辐射组,经尾静脉移植雄性供体BMMNCs(5×10^(6)个细胞);骨髓移植ASP组:同骨髓移植组,从移植的第1天起连续腹腔注射ASP[100 mg/(kg·d)×9]。模型构建期间记录小鼠体重与生存变化,模型构建结束后采集受体小鼠BMMNCs检测Y染色体性别决定区(SRY)基因,测定外周血血常规指标,计算股骨BMMNCs数,观察骨髓组织病理学;分离培养受体鼠BMSCs,观察细胞贴壁生长,5-乙炔基-2’-脱氧尿苷(EdU)法检测BMSCs增殖;分析细胞内活性氧(ROS)水平、超氧化物歧化酶(SOD)活性及丙二醛(MDA)含量;检测BMSCs培养上清液中粒细胞-巨噬细胞集落刺激因子(GM-CSF)、干细胞因子(SCF)和胰岛素样生长因子1(IGF-1)水平,检测BMMNCs与各组BMSCs共培养48 h,形成造血祖细胞混合集落(CFU-Mix)数量;Real-time PCR分析受体BMMNCs的Notch信号通路相关基因(Notch1、Jagged1、Hes1)表达。结果单纯辐射组小鼠全部死亡,骨髓移植ASP组受体鼠体重下降不明显;在受体雌鼠BMMNCs中检测到SRY基因;骨髓移植ASP组受体鼠外周血血常规和BMMNCs总数下降幅度不显著,骨髓组织病理学损伤减轻;ASP能促进BMSCs增殖,降低BMSCs中ROS、MDA含量,提高SOD活性;促进BMSCs分泌SCF、GM-CSF及IGF-1,提高BMMNCs与受体BMSCs共培养后的CFU-Mix产率;提高受体小鼠BMMNCs中Notch1、Jagged1、Hes1 mRNA表达。结论ASP促进受体小鼠造血功能重建机制与减轻造血微环境氧化应激损伤,提高BMSCs分泌造血生长因子,调控Notch信号通路有关。

2022—2023年《保健医学研究与实践》外审退稿护理论文特征分析

目的探讨2022—2023年《保健医学研究与实践》外审退稿护理论文特征,以期为临床护理人员科研工作提供参考,提高护理类论文质量和稿件录用率。方法本研究选取2022—2023年本刊外审退稿护理论文130篇为研究对象。收集各论文的基本情况,包括第一作者单位所在地区、单位性质[医疗卫生机构(级别、是否为高校附属医院)还是高等学校]、是否有基金项目、第一作者学历、第一作者职称、论文类型、论文合作人数、详细退稿意见。结果第一作者单位所在省份以河南居首,占52.31%。第一作者单位性质以医疗机构为主,占99.23%。基金项目方面以没有基金项目为主,占80.00%。其中,一级医院占1.55%(2/129),二级医院占11.63%(15/129),三级医院占86.82%(112/129);高校附属医院占27.13%(35/129),非附属医院占72.87%(94/129)。第一作者学历以本科为主,占94.61%。第一作者职称以中级为主,占58.46%。论文类型以论著为主,占96.92%。外审退稿论文的退稿原因中占比前3位的依次是缺乏创新性,观察指标选择不恰当或不完整,研究组(干预组均统一命名为研究组)干预方法与对照组雷同或混淆,分别占98.46%、92.31%、84.62%。124篇论著的干预措施主要是针对性护理、预见性护理、集束化护理、延续性护理、人性化护理、多学科协作护理模式、循证护理等,分别占11.29%、6.45%、5.64%、6.44%、4.83%、4.83%、4.03%。120篇论文退稿原因均有观察指标选择不恰当或不完整。归纳具体的退稿原因包括:观察指标和干预措施相互隔离,测评的指标不是干预的内容(92.50%);测评指标意义不大(21.67%);测评指标没有主次(99.17%);测评指标与干预措施因果关系存疑(49.17%);测评指标可行性不强(31.67%);测评指标选择过于简单(19.17%)。结论临床护士的科研素养还有很大的提升空间。尤其需对他们进行选题、观察指标选择、干预方案书写方面的培训。

人参皂苷Rg1减轻热应激致小鼠睾丸损伤的机制研究

目的探讨人参皂苷Rg1减轻热应激致小鼠睾丸损伤的机制。方法20只6~8周龄雄性C57BL/6J小鼠按随机数字表法分为4组,每组5只。对照组(Control组)和热应激组(HS组)小鼠腹腔注射0.9%生理盐水[10 mL/(kg·d)×14 d],热应激+人参皂苷Rg1组(HS+Rg1组)和人参皂苷Rg1组(Rg1组)小鼠腹腔注射人参皂苷Rg1[20 mg/(kg·d)×14 d]。HS组与HS+Rg1组小鼠在给药第7天时,将麻醉后小鼠下腹部置于43℃水浴中单次热应激30 min。小鼠精母细胞GC-2spd(ts)分为4组:对照组(Control组)细胞常规培养48 h;热应激组(HS组)细胞常规培养36 h,置于43℃水浴中单次热应激30 min,继续培养12 h;热应激+Rg1组(HS+Rg1组)在细胞培养体系中加入Rg1(终浓度50μmol/L),热应激处理同HS组;Rg1组不给予热应激处理,其余同HS+Rg1组。建模完成后1 d采集眼球血,ELISA法检测血清睾酮水平;摘取睾丸观察形态并称量,计算睾丸指数,HE染色观察睾丸组织病理学形态;制备睾丸组织匀浆检测过氧化氢酶(CAT)、丙二醛(MDA)、超氧化物歧化酶(SOD)水平;取附睾精子,计算机辅助精子分析(CASA)系统分析小鼠精子浓度和活力;TUNEL染色检测GC-2spd(ts)细胞凋亡情况;Western blot检测GC-2spd(ts)细胞Nrf2、Keap1、HO-1、Bax、Bcl-2和Caspase3蛋白表达量;RT-qPCR检测GC-2spd(ts)细胞Nrf2蛋白靶基因GCLC、GCLM和NQO1相对表达量。结果Rg1可阻止热应激所致睾丸质量和睾丸指数下降,减轻睾丸组织结构损伤,阻止精子浓度和活力下降,拮抗热应激所致睾丸间质细胞数量减少和血清睾酮水平下降,降低睾丸组织中MDA累积,提高抗氧化酶CAT和SOD的活性。Rg1还可减轻GC-2spd(ts)细胞凋亡,下调Bax、Caspase3和Keap1蛋白表达,增强Bcl-2、Nrf2和HO-1蛋白表达量,增强Nrf2蛋白靶基因GCLC、GCLM和NQO1相对表达量。结论Rg1对正常小鼠睾丸结构和功能影响不显著,但可有效提高小鼠睾丸抗热应激损伤能力,其机制可能与Rg1激活Nrf2信号通路,提高抗氧化酶活性,减少生精细胞凋亡有关。

乙炔选择加氢反应中碳化钯的动态精细调控: 气氛和氧化锌助剂的作用

碳化钯通常被认为是乙炔选择加氢反应中原位生成的活性相,其生成有助于抑制次表面非选择性的氢化钯物种,从而实现高选择性乙炔加氢制乙烯的目标.次表面上碳化钯和氢化钯物种之间的竞争很大程度上决定了乙炔加氢反应的选择性.然而,由于实际反应环境的复杂性,反应环境下的两种物种之间的动态转化过程和竞争关系尚不清晰.特别是,反应环境(比如氢气组分)对碳化钯物种的调控机制仍不明确,也使得对碳化钯活性物种的精准调控变得困难.此外,氧化锌助剂作为乙炔选择加氢反应中最常用的助剂之一,存在典型的金属-氧化物界面相互作用,也会对渗碳过程产生重要影响.因此,从动态视角理解碳化钯物种的原位形成过程,对于精准设计和合成高性能乙炔选择加氢钯基催化剂具有重要的科学意义.近年来,先进原位表征光谱技术的不断发展使得从原子、分子层面理解原位过程机制成为可能.本文旨在通过先进的原位表征技术揭示乙炔选择加氢反应中碳化钯物种的动态生成过程,并进一步探究气氛环境、温度、助催化剂等参数对碳化钯物种的动态调控机制,从而为高性能乙炔选择加氢催化剂的精准设计和合成提供有力支撑.原位研究结果表明,在氢气升温还原条件下,空气焙烧后新鲜催化剂中氧化钯相首先转变为氢化钯相;随着还原温度升高,氢化钯相的含氢量逐渐降低.当切换至乙炔选择加氢反应原料气时,氢化钯相迅速分解为金属钯,并随着恒温碳化时间的延长,烃类裂解产生的碳原子逐渐渗入钯的体相,最终形成稳定的碳化钯活性相.通过移除乙炔加氢反应原料气氛中的氢气,考察了反应气中的氢气组分对碳化钯形成的调控机制.实验发现,在仅有乙炔和乙烯存在时,碳化过程仍能发生;而引入少量氢气(体积分数2.2%)后,碳化程度显著增强,C/Pd原子比从0.136提升至0.154.相变机理研究表明,氢气的引入促进了氢化钯物种的形成,并通过晶格扩张作用促进渗碳过程.此外,还研究了氧化锌助剂对原位渗碳过程的影响,揭示了氧化锌助剂对碳化钯的抑制作用.结合原位CO吸附漫反射红外光谱、准原位X射线光电子能谱分析发现,低温氢气还原下Pd-ZnO界面作用促进了微量表面PdZn合金的生成,从而抑制了碳的渗入.这种现象在不含氢气的碳化气氛中尤为显著,碳含量降低一个数量级(C/Pd原子比仅为0.019).在此基础上,通过调节反应条件,实现了对碳化钯物种碳含量的精准调控,并与反应活性关联,揭示了碳化钯含量与乙炔选择加氢反应活性之间的线性关系.电子结构表征和同位素实验进一步表明,Pd-C的电子相互作用促进了向Pd中心原子的电子转移,从而提高了氢气的活化解离能力和乙炔加氢反应活性.综上,本工作原位解析了碳化钯的动态形成过程,阐明了氢气辅助插碳和ZnO抑制插碳的微观机制,实现了碳化钯活性物种的精准调控,揭示了碳化程度与反应活性的线性关系,为高性能乙炔选择加氢催化剂设计提供了参考.

适用于降解样本的201个遗传标记检测体系的构建和验证

近年来,法医实践中复杂案件数量逐渐增多,需要联合使用短串联重复序列(short tandem repeat,STR)、单核苷酸多态性(single nucleotide polymorphisms,SNP)、插入缺失多态性(insertion/deletion polymorphism,InDel)、微单倍型(microhaplotype,MH)等不同类型的遗传标记,为案件提供更多的参考信息。本研究筛选了24个常染色体STR(autosomes STR,A-STR)、24个Y染色体STR(Y-STR)、110个A-SNP、24个Y-SNP、9个A-InDel、1个Y-InDel、8个MH和Amelogenin共201个遗传标记,建立二代测序检测体系HID_AM Panel v1.0。根据DNA分析方法科学工作组(Scientific Working Group on DNA Analysis Methods,SWGDAM)的验证指南,对该体系的重复性、准确性、灵敏度、对降解样本的适用性、物种特异性、抗抑制性等指标进行评估。本体系分型结果与基于毛细管电泳方法检测的48个STR和Amelogenin结果完全一致,与ForenSeq™ DNA Signature Prep Kit重合的79个SNP分型结果完全一致;当DNA加入量不低于200 pg时可获得全部等位基因分型结果;当检测降解指数大于15.87的模拟降解样本时,检出成功率明显高于GlobalFilerTM PCR扩增试剂盒;当体系内血红素浓度不高于40μmol/L、靛蓝浓度不高于2 mmol/L、或腐殖酸浓度不高于15 ng/μL时,扩增无明显抑制;鸭、鼠、牛、兔、鸡的DNA特异性扩增较少;常规样本中STR检出率达99.74%,SNP、InDel、MH全部检出。综上所述,本研究建立的检测体系具有较高的准确性、灵敏度、物种特异性和抗抑制性,适用于降解样本的个体识别。

Transcriptome-based analysis of key signaling pathways affecting the formation of primordial germ cell in chickens

Bone morphogenetic protein 4(BMP4)can induce the formation of chicken primordial germ cells(PGCs)in vitro;however,its regulatory mechanism in poultry remains unknown.This study aimed to use RNA-seq to analyze PGCs in chicken embryos and iPGCs induced by BMP4 in vitro,clarify the internal regulatory factors of PGCs,analyze the mechanism of the formation of PGCs,and lay a theoretical foundation for the further optimization of PGCs induction systems.Embryonic stem cells(ESCs),PGCs and iPGCs induced by BMP4 in vitro were collected.The transcriptional maps of the three cell types were studied using RNA-seq.The results showed 6,142 genes differentially expressed between PGCs and iPGCs,of which 2,728 were upregulated in iPGCs and 3,414 were downregulated in iPGCs.Compared to that in ESCs,BMP4 was significantly upregulated in PGCs and iPGCs.KEGG results showed that both the TGF-βand Wnt signaling pathways were activated during the formation of PGCs in vitro and in vivo,and the activation was more significant during iPGCs induced by BMP4.The expression of Nodal,an inhibitory factor of TGF-βsignaling,was significantly decreased in PGCs and iPGCs,but was not expressed in iPGCs,which further supports our conclusion.Additionally,the Lysosome and PI3K-AKT signaling pathways were significantly enriched in PGCs and iPGCs,respectively.Further,transmission electron microscopy(TEM)results showed that the number of autolysosomes was significantly higher after the addition of BMP4,which is consistent with the KEGG results.Furthermore,the number of PGCs was significantly reduced after ATG14 was interfered in vivo and in vitro.In conclusion,this study screened out the key signaling pathways during the formation of PGCs,aiming to provide help for enriching the mechanism network regulating PGCs formation in chicken and laying a theoretical foundation for further improving the efficiency of inducing PGCs in vitro.

Effect of chemical regulators on the recovery of leaf physiology,dry matter accumulation and translocation,and yield-related characteristics in winter wheat following dry-hot wind

Dry-hot wind stress causes losses in wheat productivity in major growing regions worldwide,especially winter wheat in the Huang-Huai-Hai Plain of China,and both the occurrence and severity of such events are likely to increase with global climate change.To investigate the recovery of physiological functions and yield formation using a new noncommercial chemical regulator(NCR)following dry-hot wind stress,we conducted a three-year field experiment(2018-2021)with sprayed treatments of tap water(control),monopotassium phosphate(CKP),NCR at both the jointing and flowering stages(CFS),and NCR only at the jointing stage(FSJ)or flowering stage(FSF).The leaf physiology,biomass accumulation and translocation,grain-filling process,and yield components in winter wheat were assessed.Among the single spraying treatments,the FSJ treatment was beneficial for the accumulation of dry matter before anthesis,as well as larger increases in the maximum grain-filling rate and mean grain-filling rate.The FSF treatment performed better in maintaining a high relative chlorophyll content as indicated by the SPAD value,and a low rate of excised leaf water loss in flag leaves,promoting dry matter accumulation and the contribution to grain after anthesis,prolonging the duration of grain filling,and causing the period until the maximum grain-filling rate reached earlier.The CFS treatment was better than any other treatments in relieving the effects of dry-hot wind.The exogenous NCR treatments significantly increased grain yields by 12.45-18.20% in 2018-2019,8.89-13.82% in 2019-2020,and 8.10-9.00% in 2020-2021.The conventional measure of the CKP treatment only increased grain yield by 6.69% in 2020-2021.The CFS treatment had the greatest mitigating effect on yield loss under dry-hot wind stress,followed by the FSF and FSJ treatments,and the CKP treatment only had a minimal effect.In summary,the CFS treatment could be used as the main chemical control measure for wheat stress resistance and yield stability in areas with a high incidence of dry-hot wind.This treatment can effectively regulate green retention and the water status of leaves,promote dry matter accumulation and efficient translocation,improve the grain-filling process,and ultimately reduce yield losses.

Textured Perovskite/Silicon Tandem Solar Cells Achieving Over 30% Efficiency Promoted by 4-Fluorobenzylamine Hydroiodide

Monolithic textured perovskite/silicon tandem solar cells(TSCs)are expected to achieve maximum light capture at the lowest cost,potentially exhibiting the best power conversion efficiency.However,it is challenging to fabricate high-quality perovskite films and preferred crystal orientation on commercially textured silicon substrates with micrometersize pyramids.Here,we introduced a bulky organic molecule(4-fluorobenzylamine hydroiodide(F-PMAI))as a perovskite additive.It is found that F-PMAI can retard the crystallization process of perovskite film through hydrogen bond interaction between F^(−)and FA^(+)and reduce(111)facet surface energy due to enhanced adsorption energy of F-PMAI on the(111)facet.Besides,the bulky molecular is extruded to the bottom and top of perovskite film after crystal growth,which can passivate interface defects through strong interaction between F-PMA+and undercoordinated Pb^(2+)/I^(−).As a result,the additive facilitates the formation of large perovskite grains and(111)preferred orientation with a reduced trap-state density,thereby promoting charge carrier transportation,and enhancing device performance and stability.The perovskite/silicon TSCs achieved a champion efficiency of 30.05%based on a silicon thin film tunneling junction.In addition,the devices exhibit excellent longterm thermal and light stability without encapsulation.This work provides an effective strategy for achieving efficient and stable TSCs.

The Bright Single Pulse Emission from PSR B1133+16

We have conducted a comprehensive investigation into the bright single pulse emission from PSR B1133+16using the Giant Metrewave Radio Telescope.High time resolution data(61μs)were obtained at a center frequency of 322 MHz with a bandwidth of 32 MHz over a continuous observation period of 7.45 hr.A total of 1082 bright pulses were sporadically detected with peak flux densities ranging from 10 to 23 times stronger than the average pulse profile.However,no giant pulse-like emission with a relative pulse energy larger than 10 and extremely short duration was detected,indicating that these bright pulses cannot be categorized as giant pulse emission.The majority of these bright pulses are concentrated in pulse phases at both the leading and trailing windows of the average pulse profile,with an occurrence ratio of approximately 2.74.The pulse energy distribution for all individual pulses can be described by a combination of two Gaussian components and a cutoff power-law with an index of α=-3.2.An updated nulling fraction of 15.35%±0.45% was determined from the energy distribution.The emission of individual pulses follows a log-normal distribution in peak flux density ratio.It is imperative that regular phase drifting in bright pulse sequence is identified in both the leading and trailing components for the first time.Possible physical mechanisms are discussed in detail to provide insights into these observations.

长江口及其毗邻海域真菌群落时空特征

为了解长江口及其毗邻海域水体真菌群落的时空分布特征,通过真菌ITS rDNA绝对定量和其扩增子高通量测序,系统调查了2022年春季、夏季和秋季海域表层水和底层水中真菌丰度和群落结构差异。结果显示,相较于春季[表层:(1.38×10^(8)±3.02×10^(7))copies/L;底层:(1.71×10^(8)±3.78×10^(7))copies/L]和夏季[表层:(1.14×10^(8)±3.64×10^(7))copies/L;底层:(1.11×10^(8)±2.55×10^(7))copies/L],水体真菌丰度在秋季[表层:(3.02×10^(8)±6.09×10^(7))copies/L;底层:(2.56×10^(8)±3.61×10^(7))copies/L]显著增加;表层与底层水体间真菌丰度差异不显著,但表现出离岸衰减的分布格局。群落结构分析表明,海水真菌主要为子囊菌门(Ascomycota)的粪壳菌纲(Sordariomycetes),其相对丰度在秋季呈现明显升高。多样性结果显示,海水真菌群落存在明显的季节性差异;表层与底层海水真菌群落多样性呈现不一致,底层海水中真菌群落季节性更为明显。冗余分析(redundancy analysis,RDA)分析表明,该海域真菌群落变化主要受溶解氧和温度影响。上述研究结果阐明了长江口及其毗邻海域真菌丰度及群落多样性存在明显的时空分布差异,为今后进一步深入解析河口生态系统真菌的生态功能提供依据。

Publisher Correction to:Strongly Coupled 2D Transition Metal Chalcogenide‑MXene‑Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage

Due to the technical fault,a wrong version of the paper was uploaded.The content of the article was not affected,but the layout of the article was affected.The original article has been corrected.

狐肉骨粉安全性能评价

试验使用狐屠体生产肉骨粉,旨在研究狐屠体制作肉骨粉的可行性,评价狐肉骨粉安全性。试验分别从我国13个狐主要养殖区中随机选取处于取皮期、体重15 kg左右健康蓝狐3只(共39只)。狐屠体(含内脏和趾爪),经过绞碎、高压水解、脱脂、烘干、粉碎等程序制作成肉骨粉,分别测定常规营养成分、重金属、兽药残留以及犬瘟热病毒,进行安全性评价。结果表明,肉骨粉中的粗蛋白含量在55%~67%之间,符合《饲料用骨粉及肉骨粉》一级指标中粗蛋白的要求。铅、砷、汞、镉、铬重金属元素含量符合国标对肉骨粉卫生安全标准的要求。磺胺二甲嘧啶、磺胺甲恶唑、磺胺间甲氧嘧啶、磺胺嘧啶、青霉素、土霉素和庆大霉素符合食品中对兽药最大残留限量的标准要求。研究表明,狐肉骨粉的营养价值丰富,卫生和安全指标满足蛋白质饲料原料标准。

The Influence of Different Solar System Planetary Ephemerides on Pulsar Timing

Pulsar timing offers a comprehensive avenue for exploring diverse topics in physics and astrophysics.Highprecision solar system planetary ephemeris is crucial for pulsar timing as it provides the positions and velocities of solar system planets including the Earth.However,it is inevitable that inherent inconsistencies exist in these ephemerides.Differences between various ephemerides can significantly impact pulsar timing and parameter estimations.Currently,pulsar timing highly depends on the JPL DE ephemeris,for instance,the Pulsar Timing Array data analysis predominantly utilizes DE436.In this study,we examine inconsistencies across various ephemeris series,including JPL DE,EPM,and INPOP.Notably,discrepancies emerge particularly between the current ephemeris DE436 and the earliest released ephemeris DE200,as well as the most recent ephemerides,e.g.,DE440,INPOP21A,and EPM2021.Further detailed analysis of the effects of ephemeris on geometric correction procedures for the conversion of measured topocentric times of arrival is presented in this study.Our researches reveal that variations in the Roemer delays across different ephemerides lead to distinct differences.The timing residuals and the fact that these discrepancies can be readily incorporated into the subsequent pulsar parameters,leading to inconsistent fitting estimates,suggest that the influence of errors in the ephemeris on the timing process might currently be underappreciated.

Recent advances in energy storage mechanism of aqueous zinc-ion batteries

Aqueous rechargeable zinc-ion batteries(ZIBs)have recently attracted increasing research interest due to their unparalleled safety,fantastic cost competitiveness and promising capacity advantages compared with the commercial lithium ion batteries.However,the disputed energy storage mechanism has been a confusing issue restraining the development of ZIBs.Although a lot of efforts have been dedicated to the exploration in battery chemistry,a comprehensive review that focuses on summarizing the energy storage mechanisms of ZIBs is needed.Herein,the energy storage mechanisms of aqueous rechargeable ZIBs are systematically reviewed in detail and summarized as four types,which are traditional Zn^(2+)insertion chemistry,dual ions co-insertion,chemical conversion reaction and coordination reaction of Zn^(2+)with organic cathodes.Furthermore,the promising exploration directions and rational prospects are also proposed in this review.

课程体系知识图谱的构建与应用实践

课程体系整体设计和优化是提升人才培养质量的基础。知识图谱创新了知识表示和管理方式,在智能搜索与问答等领域已广泛应用,但在教育教学领域的应用还较少。基于知识图谱和自然语言处理技术,梳理课程教学计划的主要组成要素,从人才培养方案和课程教学计划中抽取课程实体、属性和关系等信息,设计了课程体系本体模型,实现了人工智能专业课程体系知识图谱的构建。依托知识图谱可视化技术,分析了课程间支撑关系和课程之间内容的重复情况,为课程体系优化设计提供了依据。

Changes in the Proportion of Precipitation Occurring as Rain in Northern Canada during Spring–Summer from 1979–2015

Changes in the form of precipitation have a considerable impact on the Arctic cryosphere and ecological system by influencing the energy balance and surface runoff. In this study, station observations and ERA-Interim data were used to analyze changes in the rainfall to precipitation ratio（RPR） in northern Canada during the spring–summer season（March–July）from 1979–2015. Our results indicate that ERA-Interim describes the spring–summer variations and trends in temperature and the RPR well. Both the spring–summer mean temperature [0.4℃–1℃（10 yr）^（-1）] and the RPR [2%–6%（10 yr）^（-1）] increased significantly in the Canadian Arctic Archipelago from 1979–2015. Moreover, we suggest that, aside from the contribution of climate warming, the North Atlantic Oscillation is probably another key factor influencing temporal and spatial differences in the RPR over northern Canada.

Gold-leaching performance and mechanism of sodium dicyanamide

In this work,sodium dicyanamide(SD)was used as a leaching reagent for gold recovery,and the effects of the SD dosage and solution pH on the gold-leaching performance were investigated.A gold recovery of 34.8%was obtained when SD was used as the sole leaching reagent at a dosage of 15 kg/t.In the presence of a certain amount of potassium ferrocyanide(PF)in the SD solution,the gold recovery was found to increase from 34.8%to 57.08%.Using the quartz crystal microbalance with dissipation(QCM-D)technique,the leaching kinetics of SD with and without PF were studied.The QCM-D results indicate that the gold-leaching rate increased from 4.03 to 39.99 ng·cm^(–2)·min^(–1) when the SD concentration was increased from 0 to 0.17 mol/L,and increased from 39.99 to 272.62 ng·cm^(–2)·min^(–1) when 0.1 mol/L of PF was used in combination with SD.The pregnant solution in the leaching tests was characterized by X-ray photoelectron spectroscopy and electrospray mass spectrometry,which indicated that Au and(N(CN)2)–in the SD solution formed a series of metal complex ions,[AuNax(N(CN)2)x+2]–(x=1,2,3,or 4).

Fermented soy whey induced changes on intestinal microbiota and metabolic influence in mice

Soy whey(SW)is generated as process waste while preparing soy protein isolates(SPI),and causing severe environmental pollution.Therefore,its value-added utilization is of prime importance for transforming and upgrading traditional industry.This study aims to utilize SW as a substrate for the growth of probiotics and produce a SW based synbiotics.By a series of trials,the effect of the dietary supplementation with this fermented SW(FSW)was analyzed on ICR mice's body weight,metabolites,and intestinal microbiota in 4 weeks.The results showed that,when SW was concentrated 15 times,the count of viable Lactobacillus casei reached 3.4×10^(9) CFU/mL by liquid fermentation method,which was the highest viable cell count among all test strains.In this FSW,the protein,amino acid,total dietary fibre,soluble dietary fibre,and oligosaccharide were 2.10%,1.63%,0.52%,0.51% and 0.79%,respectively.Compared to two control group,the total yields of the short chain fatty acids(SCFAs)were significantly improved(75%-125% at average),while the SCFAs structure was also significantly changed(especially acetic acid and butyrate)in the faeces of mice fed FSW.Meanwhile,FSW dietary addition was associated with the diversity and richness of the intestinal microbiota.Obviously,with mice's body weight loss,Firmicutes/Bacteroides ratio reduced accordingly(<1.21),and the abundance of Akkermansia muciniphila was significantly increased(the maximum amount was about 0.013%).In summary,our results indicated that the dietary supplementation of FSW affected mice's intestinal microbiota and metabolism and improved their health profile.