检索结果-南通市图书馆

Tuning MXenes Towards Their Use in Photocatalytic Water Splitting

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第6期7卷 321-331页

作者： Diego Ontiveros sergi Vela Francesc Viñes Carmen Sousa Departament de Ciència de Materials i Química Física&Institut de Química Teòrica i Computacional(IQTCUB) Universitat de Barcelonac/Martíi Franquès 1-1108028 BarcelonaSpain

Finding appropriate photocatalysts for solar-driven water(H_(2)O)splitting to generate hydrogen(H_(2))fuel is a challenging task,particularly when guided by conventional trial-and-error experimental ***,density functional theory(DFT)is used to explore the MXenes photocatalytic properties,an emerging family of two-dimensional(2D)transition metal carbides and nitrides with chemical formula M_(n+1)X_(n)T_(x),known to be semiconductors when having T_(x)*** than 4,000 MXene structures have been screened,considering different compositional(M,X,T_(x),and n)and structural(stacking and termination position)factors,to find suitable MXenes with a bandgap in the visible region and band edges that align with the water-splitting half-reaction *** from bandgap analysis show how,in general,MXenes with n=1 and transition metals from group III present the most cases with bandgap and promising sizes,with C-MXenes being superior to *** band alignment calculations of candidate systems with a bandgap larger than 1.23 eV,the minimum required for a water-splitting process,Sc_(2)CT_(2),Y_(2)CT_(2)(T_(x)=Cl,Br,S,and Se)and Y_(2)CI_(2)are highlighted as adequate photocatalysts.

关键词： Density Functional Theory MXenes Photocatalysis Water Splitting

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

决不能忽视猪流行性感冒

国外畜牧学（猪与禽） 2006年第2期26卷 46-47页

作者：张亚洲宁国 sergi bruguera David LLopart Pere Riera

猪流行性感冒一直是猪呼吸道疾病复合症(porcine respiratory disease complex)的重要组成部分,但由于流感病毒具有遗传多样性,所以必须精心选用合适的免疫接种方案。

关键词：猪流行性感冒呼吸道疾病遗传多样性组成部分流感病毒免疫接种

在线全文

学校读者我要写书评

暂无评论

接种猪流感疫苗前要检查猪群的流感状态

国外畜牧学（猪与禽） 2006年第3期26卷 51-52页

作者： sergi bruguera David LLopart Pere Riera 胡宇（译）覃矜（校） Hipra保健公司养猪技术服务队不详

在尚未对猪群及其周围环境中猪流感病毒的血清型调查清楚前,不要轻易决定免疫接种方案。

关键词：流感疫苗猪群状态检查种猪猪流感病毒周围环境免疫接种血清型

Sperm function, mitochondrial activity and in vivo fertility are associated to their mitochondrial DNA content in pigs

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2024年第4期15卷 1550-1558页

作者： Marc Llavanera Yentel Mateo‑Otero Estel Vinolas‑Vergés sergi Bonet Marc Yeste Unit of Cell Biology Department of BiologyFaculty of SciencesUniversity of GironaGirona ES‑17003Spain Biotechnology of Animal and Human Reproduction(TechnoSperm) Institute of Food and Agricultural TechnologyUniversity of GironaGirona ES‑17003Spain Catalan Institution for Research and Advanced Studies(ICREA) Barcelona ES‑08010Spain

Background Despite their low abundance in sperm, mitochondria have diverse functions in this cell type, includ-ing energy production, signalling and calcium regulation. In humans, sperm mitochondrial DNA content(mtDNAc) has been reported to be negatively linked to sperm function and fertility. Yet, the association between mtDNAc and sperm function in livestock remains unexplored. For this reason, this study aimed to shed some light on the link between mtDNAc and sperm function and fertilising potential in pigs. A qPCR method for mtDNAc quantification was optimised for pig sperm, and the association of this parameter with sperm motility, kinematics, mitochondrial activity, and fertility was subsequently *** First, the q PCR method was found to be sensitive and efficient for mtDNAc quantification in pig sperm. By using this technique, mtDNAc was observed to be associated to sperm motility, mitochondrial activity and in vivo, but not in vitro, fertility outcomes. Specifically, sperm with low mtDNAc were seen to exhibit greater motility but decreased mitochondrial activity and intracellular reactive oxygen species. Interestingly, samples with lower mtD-NAc showed higher conception and farrowing rates, but similar in vitro fertilisation rates and embryo development, when compared to those with greater *** These findings enrich our comprehension of the association of mtDNAc with sperm biology, and lay the foundation for future research into employing this parameter as a molecular predictor for sperm function and fer-tility in livestock.

关键词： Fertility Mitochondria Motility mtDNA copy number qPCR Sperm

Chromatin condensation but not DNA integrity of pig sperm is greater in the sperm-rich fraction

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2024年第1期15卷 171-181页

作者： Estel Viñolas-Vergés Jordi Ribas-Maynou Isabel Barranco Camila Peres Rubio sergi Bonet Jordi Roca Marc Yeste Unit of Cell Biology Department of BiologyFaculty of SciencesUniversity of GironaGironaSpain Biotechnology of Animal and Human Reproduction(TechnoSperm) Institute of Food and Agricultural TechnologyUniversity of GironaGironaSpain Department of Medicine and Animal Surgery Faculty of Veterinary ScienceUniversity of MurciaMurciaSpain Catalan Institution for Research and Advanced Studies(ICREA) S08010 BarcelonaSpain

Background Protamination and condensation of sperm chromatin as well as DNA integrity play an essential role during fertilization and embryo *** some mammals,like pigs,ejaculates are emitted in three separate fractions:pre-sperm,sperm-rich(SRF)and post sperm-rich(PSRF).These fractions are known to vary in volume,sperm concentration and quality,as well as in the origin and composition of seminal plasma(SP),with differences being also observed within the SRF ***,whether disparities in the DNA integrity and chromatin condensation and pro-tamination of their sperm exist has not been *** This study determined chromatin protamination(Chromomycin A3 test,CMA_(3)),condensation(Dibromobi-mane test,DBB),and DNA integrity(Comet assay)in the pig sperm contained in the first 10 m L of the SRF(SRF-P1),the remaining portion of the sperm-rich fraction(SRF-P2),and the post sperm-rich fraction(PSRF).While chromatin protamination was found to be similar between the different ejaculate fractions(P>0.05),chromatin condensation was seen to be greater in SRF-P1 and SRF-P2 than in the PSRF(P=0.018 and P=0.004,respectively).Regarding DNA integrity,no differences between fractions were observed(P>0.05).As the SRF-P1 has the highest sperm concentra-tion and ejaculate fractions are known to differ in antioxidant composition,the oxidative stress index(OSi)in SP,calcu-lated as total oxidant activity divided by total antioxidant capacity,was tested and confirmed to be higher in the SRF-P1 than in SRF-P2 and PSRF(0.42±0.06 vs.0.23±0.09 and 0.08±0.00,respectively;P<0.01);this index,in addition,was observed to be correlated to the sperm concentration of each fraction(Rs=0.973;P<0.001).Conclusion While sperm DNA integrity was not found to differ between ejaculate fractions,SRF-P1 and SRF-P2 were observed to exhibit greater chromatin condensation than the *** could be related to the OSi of each fraction.

关键词： Chromatin Condensation DNA integrity Ejaculate fractions Pig Protamination Sperm

Amyloid-beta pathology-induced nanoscale synaptic disruption:the case of the GABA_B-GIRK assembly

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1409-1410页

作者： Rafael Lujan Alejandro Martín-Belmonte sergi Ferré Francisco Ciruela Synaptic Structure Laboratory Instituto de Biomedicina de la UCLM(IB-UCLM)Departamento de Ciencias MédicasInstituto de Investigación en Salud de Castilla-La Mancha(IDISCAM)Facultad de MedicinaUniversidad Castilla-La ManchaCampus BiosanitarioC/AlmansaAlbaceteSpain Integrative Neurobiology Section National Institute on Drug AbuseIntramural Research ProgramNational Institutes of HealthBaltimoreMDUSA Pharmacology Unit Department of Pathology and Experimental TherapeuticsSchool of Medicine and Health SciencesInstitute of NeurosciencesUniversity of BarcelonaNeuropharmacology&Pain GroupNeuroscience ProgramBellvitge Institute for Biomedical ResearchL’Hospitalet de LlobregatSpain

Alzheimer's disease (AD) is characterized by an imbalance between excitatory and inhibitory brain networks,leading to aberrant homeostatic synaptic *** has progressively been recognized as syna ptopathy and syna ptic dysfunction has been identified as a key component of its pathogenesis (Schirinzi et al.,2020).Syna ptic dysfunction is believed to precede synapse loss,a primary biological correlate of cognitive decline in AD,inevita bly associated with neuronal death.

关键词： Alzheimer pathology

Matrix Algebras in Non-Hermitian Quantum Mechanics

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第7期56卷 96-98页

作者： Alessandro sergi School of Physics University of KwaZulu-NatalPietermaritzburg CampusPrivate Bag X01 Scottsville

In principle, non-Hermitian quantum equations of motion can be formulated using as a starting point either the Heisenberg＇s or the Schroedinger＇s picture of quantum dynamics. Here it is shown in both cases how to map the algebra of commutators, defining the time evolution in terms of a non-Hermitian Hamiltonian, onto a non-Hamiltonian algebra with a Hermitian Hamiltonian. The logic behind such a derivation is reversible, so that any Hermitian Hamiltonian can be used in the formulation of non-Hermitian dynamics through a suitable algebra of generalized （non-Hamiltonian） commutators. These results provide a general structure （a template） for non-Hermitian equations of motion to be used in the computer simulation of open quantum systems dynamics.

关键词： non-hermitian quantum mechanics non-Hamiltonian dynamics open quantum systems

Clues from a missense mutation of the adenosine A1 receptor gene associated with early-onset Parkinson’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第10期18卷 2204-2205页

作者： sergi Ferré Leonardo Pardo Francisco Ciruela Integrative Neurobiology Section National Institute on Drug AbuseIntramural Research ProgramNational Institutes of HealthBaltimoreMDUSA Laboratory of Computational Medicine Biostatistics UnitFaculty of MedicineUniversitat Autònoma BarcelonaBellaterraBarcelonaSpain Pharmacology Unit Department of Pathology and Experimental TherapeuticsSchool of Medicine and Health SciencesInstitute of NeurosciencesUniversity of Barcelona.Neuropharmacology&Pain GroupNeuroscience ProgramBellvitge Institute for Biomedical ResearchL’Hospitalet de LlobregatSpain

Parkinson’s disease (P D) is a com plex neu rodegenerative disorder for which ra re and common genetic variants contribute to disease risk,onset,and *** genetic contribution to PD can be classified mainly in,first,rare DNA variants that are highly penetrant and therefore causal,which are typically associated with monogenic PD;and second,more common risk polymorphic variants,which individually exert a small increase in the risk of the disease,which are usually identified in the most prevalent and apparently sporadic PD (Blauwendraat et al.,2020).

关键词： typically degenerative

A data-driven approach to π^0,η and η＇ single and double Dalitz decays

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第2期42卷 89-105页

作者： Rafel Escribano sergi Gonzàlez-Solís Crup de Fisica Tebrica Departament de Fisica Universitat Autbnoma de Barcelona E-08193 Bellaterra (Barcelona) Spain Institut de Fisica d'Altes Energies (IFAE) The Barcelona Institute of Science and Technology (BIST) Campus UAB E-08193 Bellaterra (Barcelona) Spain CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

The dilepton invariant mass spectra and integrated branching ratios of the single and double Dalitz decays P→l^＋l^-γ and P→l^＋l^-l^＋l^-（P=π^0,η,η＇;l=e or μ） are predicted by means of a data-driven approach based on the use of rational approximants applied to π^0,η and η＇ transition form factor experimental data in the space-like region.

关键词： electromagnetic processes and properties phenomenological models transition form factor