We study charmonium correlators in pseudoscalar and vector channels at finite temperature using lattice QCD simulation in the quenched approximation. Anisotropic lattices are used in order to have sufficient numbers of degrees of freedom in the Euclidean temporal direction. We focus on the low energy structure of the spectral function, corresponding to the ground state in the hadron phase, by applying the smearing technique to enhance the contribution to the correlator from this region. We employ two analysis procedures: the maximum entropy method (MEM) for the extraction of the spectral function without assuming a specific form, to estimate the shape of the spectral function, and the standard χ 2 fit analysis using typical forms in accordance with the result of MEM, for a more quantitative evaluation. To verify the applicability of the procedures, we first analyze the smeared correlators as well as the point correlators at zero temperature. We find that by shortening the t-interval used for the analysis (a situation inevitable at T > 0) the reliability of MEM for point correlators is lost, while it subsists for smeared correlators. Then the smeared correlators at T ≃ 0.9Tc and 1.1Tc are analyzed. At T ≃ 0.9Tc, the spectral function exhibits a strong peak, well approximated by a delta function corresponding to the ground state with almost the same mass as at T = 0. At T ≃ 1.1Tc, we find that the strong peak structure still persists at almost the same place as below Tc, but with a finite width of a few hundred MeV. This result indicates that the correlators possess a nontrivial structure even in the deconfined phase.
The incidence of ovarian atypical endometriosis and its association with malignant epithelial tumours in a consecutive series of cases during the period 1987 to 1995 were studied. Atypical glandular changes were observed in four (1.7%) of 255 ovarian endometriosis cases and one patient with ovarian atypical endometriosis developed subsequent endometrioid carcinoma in the abdominal wall. Fifty-four (24.1%) of the 224 ovarian cancers were associated with ovarian endometriosis; 21 with typical and 33 with atypical endometriosis. Clear cell carcinomas and endometrioid carcinomas were most frequently associated with endometriosis, with 54% (27 of 50 cases) and 41.9% (13 of 31), respectively. Atypical endometriosis was found in 18 clear cell carcinomas, in seven endometrioid carcinomas, in four serous carcinomas, in three mucinous borderline tumours, and in one serous borderline tumour. In 13 cases, the atypical endometriosis was in contiguity with malignant epithelial tumours. We consider that atypical endometriosis possesses a precancerous potential or is most frequently associated with clear cell and endometrioid carcinomas. Close screening of cellular atypia or hyperplasia in ovarian endometriosis and careful long-term follow-up of patients with atypical endometriosis is required.
Clinicopathologic, immunohistochemical, ultrastructural, and flow cytometric analyses were performed on vulvar angiomyofibroblastomas in six women (ages 32 to 46 years; average age, 41.3 years). The tumors were all well circumscribed, and measured 2 to 9 cm in greatest dimension. Five tumors were clinically diagnosed as Bartholin's gland cysts. At histologic analysis, the tumors were characterized by alternating hypercellular and hypocellular edematous areas with abundant blood vessels. The hypercellular areas showed a perivascular proliferation of spindle-shaped and round cells, which often formed small nests or epithelioid arrangements, and a short fascicular pattern of spindle cells. The proliferating vessels were thin-walled and capillary-sized. Cellular atypia and mitotic figures were absent. TwoThe term "angiomyofibroblastoma of the vulva" was coined by Fletcher et al 1 in 1992. This rare neoplasm is a d i s t i n c t i v e c l i n i c o p a t h o l o g i c entity. The well-circumscribed tumor generally arises in the superficial soft tissues of the vulva and is often clinically diagnosed as a Bartholin's gland cyst. The tumor is often misdiagnosed at pathologic analysis as aggressive angiomyxoma. The tumor does not recur after excision. To our knowledge, 43 vulval angiomyofibroblastomas have been reported in the English language literature.1-6 Recently these tumors were described in the vaginal and inguinal areas, and even the scrotum.2-6 We report our findings in six vulval angiomyofibroblastomas examined with immunohistochemical, ultrastructural, and flow cytometric analyses and discuss their histogenesis. MATERIALS AND METHODSSix case reports of vulval angiomyofibroblastoma treated between 1982 and 1996 were retrieved from the surgical pathology files at Jikei University Medical Center and the consultation files of one of the authors (M.F.). All tissue specimens were obtained by excision. The excised tumors were fixed in buffered formalin solution and embedded in paraffin. Sections were routinely stained with hematoxylin-eosin, and some also were stained with periodic acid-Schiff, Alcian blue, and Masson trichrome stains.Immunohistochemical studies were performed on formalin-fixed, paraffin-embedded tissues using the avidin-biotin peroxidase complex (ABC) method (ABC kit, Vector Laboratories, Burlingame, Calif) and the peroxidase-antiperoxidase technique. Primary antibodies against the following antigens were used: vimentin (monoclonal, diluted 1:40; Amersham, Little Chalfont, England), desmin (polyclonal, 1:50;
A case of uterine carcinosarcoma with extensive neuroectodermal differentiation occurring in a 54-year-old woman is described. Microscopically, the endometrial tumour was predominantly composed of a sheet-like proliferation of small- and medium-sized cells. These cells were characterized by fibrillary cytoplasmic processes, rosette-like formations, perivascular palisading patterns, and immunoreactivity for glial fibrillary acidic protein, synaptophysin, leu 7 and neuron-specific enolase. In limited areas, features of conventional carcinosarcoma, including squamous cell carcinoma, leiomyosarcoma and islands of the above mentioned small- to medium-sized cells that were intermingled, were observed. The tumour was aneuploid by flow cytometry. The patient is alive with tumour for three months. It is suggested that at least some cases of uterine primitive neuroectodermal tumour may be explained by one-sided neuroectodermal development within a carcinosarcoma.
We study the charmonium properties at finite temperature using quenched lattice QCD simulations. Although a simple potential model analysis indicates no bound state at $T>1.05T_c$, our analyses of the spatial correlation between quark and anti-quark and the spectral function indicate that a bound-state-like structure may survive even above $T_c$.Comment: 4 pages, 3 figures, Talk presented at the PANIC02 conference, Sept. 30 - Oct. 4, 2002, Osaka, Japa
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.