In this study, a coating from electrospun silk fibroin was performed with the aim to modify the surface of breast implants. We evaluated the effect of fibroin on polymeric matrices of poly (ethylene ...oxide) (PEO) to enhance cell viability, adhesion, and proliferation of HaCaT human keratinocytes to enhance the healing process on breast prosthesis implantation. We electrospun six blends of fibroin and PEO at different concentrations. These scaffolds were characterized by scanning electron microscopy, contact angle measurements, ATR-FTIR spectroscopy, and X-ray diffraction. We obtained diverse network conformations at different combinations to examine the regulation of cell adhesion and proliferation by modifying the microstructure of the matrix to be applied as a potential scaffold for coating breast implants. The key contribution of this work is the solution it provides to enhance the healing process on prosthesis implantation considering that the use of these PEO⁻fibroin scaffolds reduced (p < 0.05) the amount of pyknotic nuclei. Therefore, viability of HaCaT human keratinocytes on PEO⁻fibroin matrices was significantly improved (p < 0.001). These findings provide a rational strategy to coat breast implants improving biocompatibility.
Most of the indicators for STEM programs in higher education such as the number of programs and students enrolled depend on what is considered as a STEM program. Currently, each country develops its ...own STEM indicators, without establishing comparable criteria across countries for the selection of the programs considered STEM, which make it difficult for a correct comparison between countries. Despite this, the OECD publishes comparative reports on the state of STEM higher education among its member countries. The OECD develops these reports with data provided by each country; that is, each country decides the mechanisms to produce the data. This paper proposes a selection criterion of STEM programs to generate internationally comparable data. This work obtains the selection criterion through a conceptual and contextual socio-historical review of the STEM movement. This work conducts an exploratory case study in Mexico from 2011 to 2017 to show the discrepancy in STEM higher education indicators when using different selection criteria. The results show that 60% of the programs classified as STEM, do not meet the classification criteria established. Also, that 60 % of misclassified programs have a higher curricular content of administrative or social subjects, but in their name includes words that refer to STEM fields. The authors call these programs as Management-STEM (MSTEM).
The 30th Annual Meeting of the Division of Particles and Fields (DPyC) of the Mexican Physical Society was held at Edificio Carolino, Benemérita Universidad Autónoma de Puebla, Mexico, on 23-25 May ...2016. 125 participants and 83 presentations (20 posters and 63 talks including 47 contributed, 15 invited and a closing round table discussion) of high scientific quality certify the success of this meeting and witness the good health of the DPyC. Excited and encouraged by this fact, we decided to coordinate the edition of a proceedings volume commemorating and celebrating this anniversary, including the communications corresponding to this meeting as well as those of the recent XV Mexican Workshop on Particles and Fields, held at Playa Mazatlán Beach Hotel, Mazatlán, Mexico on 2-6 November 2015, where 46 works were discussed. All presenters of these meetings were invited to contribute and the majority of them accepted -in spite of many other pressing simultaneous commitments. Additionally, we decided to invite researchers who were not able to attend these conferences, despite they used to be very involved in the activities of our community. With these invitations we also tried to reduce the inequality between male and female contributors and to enable researchers from the most isolated places in Mexico to participate, as well. Given the commemorative nature of this volume, we wished to have some historical perspec-tives on speci_c aspects of our community which were not addressed in previous texts on the birth of the DPyC 1, 2, 3, 4. We acknowledged our colleagues preparing essays on the creation of research networks and their interactions with DPyC, on the development of accelerator physics in Mexico and on the experimental and theoretical-research summers on high-energy physics, giving our best undergrads the support to spend a summer in a world-leading institution making their _rst steps in research. The scienti_c program of the 2015Workshop and 2016 Meeting covered a wide range of topics, including physics beyond the Standard Model (theory and experimental searches, astroparticles, cosmology, dark matter and dark energy, strings and QFT fundamentals), hadronic matter (per-turbative QCD, jets and di_ractive physics, hadronic structure, soft QCD, spectroscopy, heavy ion collisions and soft physics at hadron colliders and lattice simulations), avor physics (quark masses and mixing, electroweak symmetry breaking, heavy quark physics, neutrino physics, CP violation, CKM and rare decays) and science and technology of accelerators and high perfor-mance computing. These are all reected in this volume celebrating our 30th anniversary and wishing for the best to the DPyC and to its members in the future.
B Physics at the DO experiment Cruz Burelo, Eduard de la
AIP conference proceedings,
11/2008, Letnik:
1077, Številka:
1
Journal Article
Recenzirano
At the beginning of RunII of the Tevatron and after more than 30 years of the discovery of the b quark at Fermilab, the lack of statistics had restricted our knowledge on b-baryons to the observation ...of the lightest b-baryon, the {lambda}{sub b}, and to its lifetime measured in decays which did not allow a fully reconstruction of this particle. I present results of the search for b-baryons in the DO experiment. As part of this program, a precise measurement of the {lambda}{sub b} lifetime was performed, and the discovery of the {xi}{sub b}{sup -} resulted from an analysis of 1.3 fb{sup -1} of data collected with the D0 detector during 2002-2006.
B Physics @ the DO experiment De La Cruz Burelo, Eduard
Advanced Summer School in Physics 2008 (AIP Conference Proceedings Volume 1077),
07/2008, Letnik:
1077
Journal Article
Measuring the mass of particles whose decay products cannot be detected poses a significant challenge due to the complexity of reconstructing these decays and measuring various parameters. However, ...studying processes involving undetectable particles is crucial as it enables us to delve deeper into familiar decays involving energy loss, such as Standard Model processes involving neutrinos. Additionally, it provides an opportunity to test models associated with physics beyond the Standard Model that can be generated in leptonic colliders. In this study, the mass of the tau lepton was determined by comparing three different methods for decays with semi-invisible final states. Specifically, the measurement focused on the decay τ − → π −ντ (signal). Among the three methods employed, the most accurate result was obtained using the Mmin method, yielding a tau lepton mass value of Mτ = 1777.06 ± 0.44 MeV. The measurement utilized official Monte Carlo data provided by the Belle II collaboration, specifically from the MC13a campaign conducted until 2020, with an integrated luminosity of 100fb−1 .
We present the latest results from the DØ experiment on the properties of excited and heavy b-hadrons. DØ collaboration has measured the Ab lifetime in semileptonic decays as well as in a fully ...reconstructed decay channel. In addition, the first direct observation of the Ξb− baryon is reported.
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