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Oganesian, Arutun; Bueno, Elena Villamañán; Yan, Qiong; Spee, Christine; Black, J. E.; Rao, Narsing A.; Lopez, Pedro F.

doi:10.1023/a:1026402031902

Cited by 29 publications

(27 citation statements)

References 58 publications

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“…The breakdown of the blood-retina barrier in fragment transplants thus seems to permit dendritic cells from the host choroid to invade the graft. The delayed healing of RPE defects associated with these grafts as compared with normal RPE healing [66]indicates that the fragmented donor tissue affects the host RPE, either directly or through a response from the host immune system. The RPE defects in full-thickness grafts on the other hand healed well, and the remaining small breaks were never associated with any increase in MHC-expressing cells.…”

Section: Discussionmentioning

confidence: 99%

Full-Thickness Retinal Transplants: A Review

Ghosh

Ehinger²

2000

Ophthalmologica

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Embryonic full-thickness rabbit neuroretinal sheets were transplanted to the subretinal space of adult hosts. This was accomplished by using a new transplantation technique involving vitrectomy and retinotomy. The grafts were followed from 10 to 306 days after surgery and were then examined by different histological techniques. In the light microscope, the transplants were seen to develop the normal retinal lamination and fusion with the host retina, especially after long survival times. Ultrastructurally, normal photoreceptor outer segments, well integrated with the host retinal pigment epithelium, were found. Growth cones were present in the zone of fusion between graft and host retina. Immunohistochemical labeling revealed many of the normal retinal components not previously found in retinal transplants, and graft-host connections between neurons in the rod pathway were seen. The morphology of vibratome-sectioned neuroretinal sheets as well as adult full-thickness grafts was also examined. These transplantation types showed less of the normal morphology compared with embryonic full-thickness grafts. The immunogenicity of embryonic full-thickness and fragmented grafts was compared using major histocompatibility complex immunolabeling. Fragmented grafts elicited a response from the host immune system similar to a chronic transplant rejection. This reaction was absent in the full-thickness grafts which is in accordance with their good long-term survival.

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Section: Discussionmentioning

confidence: 99%

Full-Thickness Retinal Transplants: A Review

Ghosh

Ehinger²

2000

Ophthalmologica

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“…12 , obtained [18]. The continuum dependence is weak, we use standard value s 0 = 1.5GeV 2 -thick line ).…”

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confidence: 99%

Calculation of the pentaquark width using QCD sum rules

Oganesian

2006

Jetp Lett.

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The pentaquark width is calculated in QCD sum rules. Result for Γ Θ show, that Γ Θ can vary in the region less than 1M eV . The main conclusion is, that if pentaquark is genuine states then sum rules really predict the narrow width of pentaquark θ + , and the suppression of the width is both parametrical and numerical.PACS: 12.39 Dc, 12.38 In this paper we will discuss the the narrow exotic baryon resonance Θ + with quark content Θ + = uudds and mass 1.54 GeV. This resonance had been discovered by two groups [1,2]. Later, the existence of this resonance was confirmed by many other groups, although some searches for it were unsuccessful. Moreover, last year some groups, which have seen pentaquark, in the new experiments with higher statistics. reported null result for pentaquark signal (CLAS experiments on hydrogen and deuterium [3], BELLE [4]) but at the same time DIANA [5], and also LEPS, SVD-2 confirm their results with higher statistic(see [6] for the review).So the status of Θ + , predicted in 1997 by D.Diakonov, V.Petrov and M.Polyakov [7] in the Chiral Soliton Model, till now is doubtful. (Some theoretical reviews are given in [8,9]).One of the most interesting features of Θ + is its very narrow width. Experimentally, only an upper limit was found, the stringer bound was presented in [2]: Γ < 9MeV . The phase analysis of KN scattering results in the even stronger limit on Γ [10], Γ < 1MeV . A close to the latter limitation was found in [11] from the analysis of Kd → ppK reaction and in [12] from K + Xe collisions data [2]. Also [4] from the negative result of the experiment give the upper limit for pentaquark width less than 640KeVSuch extremely narrow width of Θ + (less than 1MeV ) seems to be very interesting theoretical problem. In the paper [13], [14] it was shown, that if pentaquark is genuine 1

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“…Uma abordagem para o estudo dos pentaquarks consiste em usar métodos nãoperturbativos da cromodinâmica quântica (QCD), onde destacamos o uso das Regras de Soma da QCD (QCDSR). Vários grupos têm usado as QCDSR para o estudo da Θ + (1540) [12,13,14,15,16,17], Ξ −− (1862) [18] e Θ 0 C (3099) [19]. Nosso grupo desenvolveu trabalhos para dois desses pentaquarks, a Θ + (1540) [17] e o Ξ −− (1862) [18], usando dois tipos de corrente para os pentaquarks, motivadas na proposta de JW.…”

Section: Capítulo 1 Introduçãounclassified

“…Usando as QCDSR, Oganesian [15] sugeriu uma explicação qualitativa para a largura da Θ + . Ele partiu de observações simples a respeito das simetrias das correntes que descrevem os hádrons no decaimento, e as propriedades do diagrama básico do decaimento no lado teórico da regra de soma.…”

Section: Capítulo 1 Introduçãounclassified

“…Ele partiu de observações simples a respeito das simetrias das correntes que descrevem os hádrons no decaimento, e as propriedades do diagrama básico do decaimento no lado teórico da regra de soma. As análises apresentadas em [15] são apenas qualitativas, mas chega-seà conclusão de que a largura de decaimento seria proporcional a α 2 s qq 2 , devido a necessidade de troca de gluons para se obter estados finais singletos de cor, a partir de um pentaquark que tem uma estrutura de cor não trivial.…”

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Abstract: Hydraulic debridement of the RPE in vivo is a useful investigational model that provides important insight into the pathogenesis of outer retinal disorders and their treatment with such techniques as submacular surgery or RPE transplantation.

Cited by 29 publications

References 58 publications

Full-Thickness Retinal Transplants: A Review

Full-Thickness Retinal Transplants: A Review

Calculation of the pentaquark width using QCD sum rules

"Constantes de acoplamento a partir das regras de soma da QCD"

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