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Anisotropic stellar structure equations for magnetized strange stars

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Research in Astronomy and Astrophysics 2015年第7期15卷 975-985页

作者： Daryel Manreza Paret j.rge Ernesto Horvath Aurora Pérez mart'nez Departamento de F'sica General Facultad de F'sica Universidad de la Habana Instituto de Astronomia Geofisica e Ciencias Atmosfericas USP Instituto de Cibernética Matemática y Física (ICIMAF)

The fact that a fermion system in an external magnetic field breaks the spherical symmetry suggests that its intrinsic geometry is axisymmetric rather than spherical. In this work we analyze the impact of anisotropic pressures, due to the presence of a magnetic field, in the structure equations of a magnetized quark *** assume a cylindrical metric and an anisotropic energy momentum tensor for the source. We found that there is a maximum magnetic field that a strange star can sustain, closely related to the violation of the virial relations.

关键词： magnetic fields -- stars: neutron -- equation of state

Characterization and QTL identification in eggplant introgression lines under two N fertilization levels

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Horticultural Plant j.urnal 2023年第5期9卷 971-985页

作者： Elena Rosa-martínez Gloria Villanueva Ahmet Sahin Pietro Gramazio María Dolores García-martínez María Dolores Raig on Santiago Vilanova j.ime Prohens Mariola Plazas Instituto de Conservacion y Mej.ra de la Agrodiversidad Valenciana Universitat Politecnica de ValenciaCamino de Vera 1446022 ValenciaSpain Instituto de Biología Molecular y Celular de Plantas Consejo Superior de Investigaciones Científicas-Universitat Politecnica de ValenciaCamino de Vera 1446022 ValenciaSpain

Lowering nitrogen inputs is a maj.r goal for sustainable *** the present study,a set of 10 Solanum melongena introgression lines(ILs)developed using Solanum incanum as the exotic donor parent were grown under two nitrogen fertilization doses supplied with the irrigation system:1)8.25 mmol·L-1NH4NO3,corresponding to the high nitrogen treatment(HN),and 2)no external nitrogen supply,corresponding to the low nitrogen treatment(LN).Twenty traits,including plant growth and yield parameters,fruit size and morphology,nitrogen and carbon content in leaf and fruit,and phenolics content in fruit,were *** aim was to select of potential materials for eggplant breeding under low N inputs,as well as to identify and locate putative QTLs associated with the traits *** significant differences were observed between the soil characteristics of the HN and LN treatments,except for nitrogen and iron content,which was slightly lower in the HN,probably as a consequence of higher nutrient removal from soil by plants in the latter *** of variance showed that lowering nitrogen inputs did not significantly affect the final yield,fruit morphology,size and phenolics *** agronomic traits were highly and positively correlated with each other under both treatments,as well as total phenolics with chlorogenic acid *** assessment of the differences between each IL and the recipient parent resulted in the identification of 36 QTLs associated with most of the traits—12 were specific to the HN,17 specific to the LN,and 7 were stable across *** introgressed fragment of *** generally had a negative effect on the trait,except for QTLs for fruit dry matter,for fruit length on chromosome 10 under the HN,and for fruit pedicel length on chromosome 9 under the *** increase over AN-S-26 of the allele of *** for the QTLs detected ranged between-73.98% and 26.03% in HN and-73.67%and 34.43% in *** findings provide useful tools fo

关键词： Solanum melongena Solanum incanum Wild relatives N fertilization Abiotic stress QTL

Importance of BRCA mutation for the current treatment of pancreatic cancer beyond maintenance

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World j.urnal of Gastroenterology 2021年第39期27卷 6515-6521页

作者： j.aquina martínez-Galán Isabel Rodriguez Octavio Caba Department of Medical Oncology Virgen de las Nieves University HospitalGranada 18014Spain Institute of Biopathology and Regenerative Medicine(IBIMER) University of GranadaGranada 18016Spain

In this editorial,we comment on pancreatic cancer(PC),one of the most aggressive and lethal *** minimal improvements in survival rates have been achieved over recent *** chemotherapeutic regimens have little impact,and surgical resection remains the only reliable curative *** address current treatment options for these patients,focusing on the usefulness of breast cancer(BRCA)gene mutation as a prognostic biomarker and predictor of response to *** survival outcomes have been reported in patients with PC and mutant BRCA gene treated with first-line platinum-based ***,it appears appropriate to include BRCA gene status among clinical criteria used to select the chemotherapy *** addition,maintenance treatment with poly(ADP-ribose)polymerase inhibitors has been found to improve progression-free survival in patients with PC and mutated BRCA whose disease does not progress after first-line platinum-based *** combination has therefore been proposed as the optimal treatment regimen for these patients.

关键词： Pancreatic cancer Treatment BRCA Mutation Poly(ADP-ribose)polymerase inhibitor Maintenance

Maximum mass of magnetic white dwarfs

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Research in Astronomy and Astrophysics 2015年第10期15卷 1735-1741页

作者： Daryel Manreza Paret j.rge Ernesto Horvath Aurora Pérez martínez Departamento de Fisica General Facultad de FísicaUniversidad de la Habana Instituto de Astronomia Geofisica e Ciencias Atmosfericas USP Instituto de Cibernética Matemática y Física(ICIMAF)

We revisit the problem of the maximum masses of magnetized white dwarfs （WDs）. The impact of a strong magnetic field on the structure equations is addressed. The pressures become anisotropic due to the presence of the magnetic field and split into parallel and perpendicular components. We first construct stable solutions of the Tolman-Oppenheimer-Volkoff equations for parallel pressures and find that physical solutions vanish for the perpendicular pressure whenB ≥ 10^13 G. This fact estab- lishes an upper bound for a magnetic field and the stability of the configurations in the （quasi） spherical approximation. Our findings also indicate that it is not possible to obtain stable magnetized WDs with super-Chandrasekhar masses because the val- ues of the magnetic field needed for them are higher than this bound. To proceed into the anisotropic regime, we can apply results for structure equations appropriate for a cylindrical metric with anisotropic pressures that were derived in our previous work. From the solutions of the structure equations in cylindrical symmetry we have con- firmed the same bound for B- 10^13 G, since beyond this value no physical solutions are possible. Our tentative conclusion is that massive WDs with masses well beyond the Chandrasekhar limit do not constitute stable solutions and should not exist.

关键词： magnetic fields -- white dwarfs -- equation of state

CXC family of chemokines as prognostic or predictive biomarkers and possible drug targets in colorectal cancer

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World j.urnal of Gastroenterology 2018年第42期24卷 4738-4749页

作者： Sara Cabrero-de las Heras Eva martínez-Balibrea Program Against Cancer Therapeutic Resistance Catalan Institute of OncologyGermans Trias i Pujol health research institute Program of Predictive and Personalized Cancer Medicine Germans Trias i Pujol health research institute

Colorectal cancer(CRC) is the third most common cancer in men and the second most common cancer in women,worldwide. In the early stages of the disease, biomarkers predicting early relapse would improve survival *** metastatic patients, the use of predictive biomarkers could potentially result in more personalized treatments and better outcomes. The CXC family of chemokines(CXCL1 to 17) are small(8 to 10 kDa) secreted proteins that attract neutrophils and lymphocytes. These chemokines signal through chemokine receptors(CXCR) 1 to *** studies have reported that these chemokines and receptors have a role in either the promotion or inhibition of cancer, depending on their capacity to suppress or stimulate the action of the immune system, *** general terms, activation of the CXCR1/CXCR2 pathway or the CXCR4/CXCR7 pathway is associated with tumor aggressiveness and poor prognosis; therefore,the specific inhibition of these receptors is a possible therapeutic strategy. On the other hand, the lesser known CXCR3 and CXCR5 axes are generally considered to be tumor suppressor signaling pathways, and their stimulation has been suggested as a way to fight *** pathways have been studied in tumor tissues(using immunohistochemistry or measuring mRNA levels)or serum [using enzyme-linked immuno sorbent assay(ELISA) or multiplexing techniques], among other sample types. Common variants in genes encoding for the CXC chemokines have also been investigated as possible biomarkers of the disease. This review summarizes themost recent findings on the role of CXC chemokines and their receptors in CRC and discusses their possible value as prognostic or predictive biomarkers as well as the possibility of targeting them as a therapeutic strategy.

关键词： Biomarkers Treatment Chemotherapy Oxaliplatin Irinotecan Immunotherapy Colorectal cancer CXC chemokines Immune system Bevacizumab

A Secure Elliptic Curve-Based RFID Protocol

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j.urnal of Computer Science & Technology 2009年第2期24卷 309-318页

作者： Santi martínez Magda Valls Concepció Roig j.sep M. Miret Francesc Giné Computer Science Department Universitat de Lleida Mathematics Department Universitat de Lleida

Nowadays, the use of Radio Frequency Identification （RFID） systems in industry and stores has increased Nevertheless, some of these systems present privacy problems that may discourage potential users. Hence, high confidence and efficient privacy protocols are urgently needed. Previous studies in the literature proposed schemes that are proven to be secure, but they have scalability problems. A feasible and scalable protocol to guarantee privacy is presented in this paper. The proposed protocol uses elliptic curve cryptography combined with a zero knowledge-based authentication scheme. An analysis to prove the system secure, and even forward secure is also provided.

关键词： elliptic curve cryptography forward security RFID zero knowledge

Effect of calcination temperature on structural properties and catalytic activity in oxidation reactions of LaNiO_3 perovskite prepared by Pechini method

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j.urnal of Rare Earths 2012年第3期30卷 210-216页

作者： K. Rida M.A. Pea E. Sastre A. martínez-Arias Laboratory for the Study of Interactions Between Materials and Their Environment University of Jijel Institute of Catalysis and Petroleum-Chemistry CSIC C/Marie Curie 2 Campus de Cantoblanco 28049 Madrid Spain

The study presented the preparation of the perovskite oxide LaNiO3 by the complex citrate method, paying particular attention to evolution of its formation from the amorphous precursor with varied calcination temperatures. The products obtained after heat treatment under air between 200 and 800 ℃ were characterized by X-ray diffraction （XRD）, thermogravimetric and differential thermal analysis （TG-DTA）, Fourier transform infrared spectroscopy （FTIR）, SBET measurements and X-ray photoelectron spectroscopy （XPS）. The results showed the formation of a single phase with perovskite structure from ca. 550 ℃. Tests on the two catalytic oxidation reactions of C3H6 and CO over the system calcined between mentioned temperatures were examined on the basis of characterization results and showed that optimum catalytic properties for such reactions were achieved for the perovskite calcined at 600 ℃. In turn, correlations between redox and catalytic properties were established on the basis of thermogravimetric temperature programmed reduction （TPR） analysis.

关键词： LaNiO3 perovskite Pechini SOFC C3H6 and CO combustion rare earths

Influence of steel j.cket thickness on the RC bridges' seismic vulnerability

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j.urnal of Traffic and Transportation Engineering(English Edition) 2019年第1期6卷 15-34页

作者： Bertha Olmos j.sé Manuel j.ra Gerardo Gómez Guillermo martínez Department of Civil Engineering Universidad Michoacana de San Nicolas de Hidalgo

The seismic demands of bridges subj.cted to strong earthquakes are mostly concentrated on piers. The main obj.ctive of this study is to assess the seismic vulnerability of retrofitted bridges with steel j.ckets. It analyzes the influence of the steel j.cket thickness on the seismic capacity and demand of bridges. The bridges in study have two simple supported spans with superstructure composed by AASHTO type girders and a substructure formed with one circular pier over a stiff foundation. They are located on the Pacific coast of Mexico that is a zone of high seismicity. The bridges seismic capacity are evaluated through nonlinear static analyses and the shear force and displacement demands were determined using capacity spectra with a group of 10 real accelerograms from a subduction source. The response spectra were scaled to several peak ground accelerations(PGA) with the aim to estimate four damage scenarios linked each one to a probability of exceedance in a specific period, for return periods in the range of 72-3500 years that represent service level and maximum considered earthquake. Results show that the confining effect provided by the steel j.ckets substantially improves the seismic performance of the bridges piers. The increase of j.cket thickness guides to important increments on columns base shear capacity, and the influence of the steel j.cket thickness depends on the limit state and bridge slenderness ratio.

关键词： Steel j.cket Piers’retrofit Subduction earthquakes RC piers’vulnerability

Toll-like receptor 4 and protease-activated receptor 2 in physiology and pathophysiology of the nervous system:more than j.st receptor cooperation?

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Neural Regeneration Research 2019年第7期14卷 1196-1201页

作者： Darius Widera Rocío martínez Aguilar Graeme S.Cottrell Stem Cell Biology and Regenerative Medicine Group School of PharmacyUniversity of ReadingWhiteknights campus Unidad de Inmunología IBIMERUniversidad de Granada Cellular and Molecular Neuroscience School of PharmacyUniversity of Reading

Toll-like receptor 4(TLR4) and protease-activated receptor 2(PAR2) play pivotal roles in the mammalian innate immune ***,in addition to their involvement in detection of invading pathogens,PAR2 and TLR4 modulate the levels of cell death-induced sterile inflammation by activating pro-or anti-inflammatory downstream signaling *** the central nervous system,there is emerging evidence that both receptors are involved in synaptic transmission and brain ***,due to their prominent role in mediating neuroinflammation,PAR2 and TLR4 are associated with development and progression of neurodegenerative disorders including but not limited to Alzheimer's disease,Parkinson's disease and multiple *** this article,we summarise the current knowledge on the cooperation between PAR2 and TLR4,discuss the potential cross-talk levels and highlight the impact of the cross-coupling on neuroinflammation.

关键词： signaling inflammation proteases myeloid of differentiation primary response gene 88 TIR-domain containing adaptor inducing interferon lipopolysaccharide TLR4 PAR2