On two- and three-body descriptions of hybrid mesons

Hybrid mesons are exotic mesons in which the color field is not in its ground state. Their understanding deserves interest from a theoretical point of view, because it is intimately related to nonperturbative aspects of QCD. In this work, we analyze and compare two different descriptions of hybrid mesons, namely a two-body $q\bar q$ system with an excited string, or a three-body $q\bar q g$ system. In particular, we show that the constituent gluon approach is equivalent to an effective excited string in the heavy hybrid sector. Instead of a numerical resolution, we use the auxiliary field technique. It allows to find simplified analytical mass spectra and wave functions, and still leads to reliable qualitative predictions. We also investigate the light hybrid sector, and found a mass for the lightest hybrid meson which is in satisfactory agreement with lattice QCD and other effective models.Comment: 2 figure

Prevalencia da defiCiência de C2 do complemento em doadores de sangue e em pacientes com lupus eritematoso sistemico

BV UNIFESP: Teses e dissertaçõe

Epigallocatechin- 3-gallate improves plantaris muscle recovery after disuse in aged rats

Aging exacerbates muscle loss and slows the recovery of muscle mass and function after disuse. In this study we investigated the potential that epigallocatechin gallate (EGCg), an abundant catechin in green tea, would reduce signaling for apoptosis and promote skeletal muscle recovery in the fast plantaris muscle and the slow soleus muscle after hindlimb unloading (HLS) in senescent animals. Fischer 344 × Brown Norway inbred rats (age 34 mo.) received either EGCg (50 mg/kg body weight), or water daily by gavage. One group of animals received HLS for 14 days and a second group of rats received 14 days of HLS, then the HLS was removed and they recovered from this forced disuse for 2 weeks. Animals that received EGCg over the HLS followed by 14 days of recovery, had a 14% greater plantaris muscle weight (p \u3c0.05) as compared to the animals treated with the vehicle over this same period. Plantaris fiber area was greater after recovery in EGCg (2715.2 ± 113.8 μm2) vs. vehicle treated animals (1953.0 ± 41.9 μm2). In addition, activation of myogenic progenitor cells was improved with EGCg over vehicle treatment (7.5% vs. 6.2%) in the recovery animals. Compared to vehicle treatment, the apoptotic index was lower (0.24% vs. 0.52%), and the abundance of pro-apoptotic proteins Bax (−22%), and FADD (−77%) were lower in EGCg treated plantaris muscles after recovery. While EGCg did not prevent unloading-induced atrophy, it improved muscle recovery after the atrophic stimulus in fast plantaris muscles. However, this effect was muscle specific because EGCg had no major impact in reversing HLS-induced atrophy in the slow soleus muscle of old rats

‘You need that loving tender care’ : maternity care experiences and expectations of ethnic minority women born in the United Kingdom

Objective To explore the maternity care experiences and expectations of United Kingdom (UK)-born ethnic minority women. Methods Qualitative in-depth interviews with 34 UK-born mothers of Black Caribbean, Black African, Indian, Pakistani, Bangladeshi and Irish descent, recruited mainly from nine National Health Service (NHS) maternity units in England. Results Overall, women felt that their ethnic background did not matter at all with respect to the care they received. UK-born women's familiarity with the system and the absence of language barriers were felt to be influential in getting treated the same as White women. Women stressed the need for professionals to be ‘sensitive’ and ‘delicate’ in their interactions and wanted ‘continuity of care’. In general, they were positive about the adequacy of the information given during their antenatal appointments, but some women found it difficult to get access to antenatal classes. Women valued good communication and consistent information, with their views acknowledged and their questions answered consistently. They also expressed the need for better physical environments in maternity units. Conclusions Our findings contribute to the growing evidence about the need to improve maternity and postnatal care, and to develop more sensitive and women-centred care for all women irrespective of ethnic background