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Search Results: 1 - 10 of 18852 matches for " Miguel Maia "
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On the arithmetic product of combinatorial species
Manuel Maia,Miguel Mendez
Mathematics , 2005,
Abstract: We introduce two new binary operations with combinatorial species; the arithmetic product and the modified arithmetic product. The arithmetic product gives combinatorial meaning to the product of Dirichlet series and to the Lambert series in the context of species. It allows us to introduce the notion of multiplicative species, a lifting to the combinatorial level of the classical notion of multiplicative arithmetic function. Interesting combinatorial constructions are introduced; cloned assemblies of structures, hyper-cloned trees, enriched rectangles, etc. Recent research of Cameron, Gewurz and Merola, about the product action in the context of oligomorphic groups, motivated the introduction of the modified arithmetic product. By using the modified arithmetic product we obtain new enumerative results. We also generalize and simplify some recent results of Canfield, and Pittel, related to the enumerations of tuples of partitions with restricted meet.
International Conference on Structural Engineering Dynamics 2013
Nuno M. M. Maia,Miguel M. Neves
Shock and Vibration , 2014, DOI: 10.1155/2014/645026
Abstract:
Caracteriza??o do Espectro Polínico dos Méis do Alentejo (Portugal)
Maia,Miguel; Russo-Almeida,Paulo A.; Pereira,José O.;
Silva Lusitana , 2005,
Abstract: the pollen spectra of 36 samples of honey produced in the alentejo region (portugal) were analysed during the year 2000. these samples were treated through acetolysis and at least 1200 pollen grains were counted per sample. 27 botanical families and 36 pollinic types were identified. lavandula stoechas and echium plantagineum were the principle nectariferous species in the pollen spectra. of the 36 samples analysed, 39% were unifloral of lavander honey, 33% of viper's bugloss honey and 28% of multifloral honey.
Associa o entre a classifica o CEAP e altera es no Eco-doppler venoso dos membros inferiores Association between the CEAP classification and Duplex-scan findings
Miguel Maia,Joana Ferreira,Sandrina Braga,Jo?o Vasconcelos
Angiologia e Cirurgia Vascular , 2010,
Abstract: Objectivos: Correlacionar as manifesta es clínicas da classifica o CEAP com as altera es no Eco-Doppler venoso dos membros inferiores. Material e métodos: Foram avaliados 806 membros (403 doentes consecutivos), submetidos a Eco-Doppler venoso dos membros inferiores no decurso da investiga o de insuficiência venosa crónica. Resultados: Média de idades de 46,8 anos, 360 mulheres e 43 homens. Constatou-se uma diferen a entre o número de doentes sintomáticos conforme o género, 62,5% mulheres versus 44,2% homens (p<0,001). Doentes com idade =60 anos também foram mais frequentemente classificados como sintomáticos (p<0,001). A atribui o de uma classe C sintomática correlacionou-se com insuficiência da veia grande safena e de perfurantes mediais da perna (p<0,001). Membros classificados como assintomáticos, C1a e C2a, apresentaram insuficiência de perfurantes mediais da perna em apenas 36,4%, enquanto que a mesma foi identificada em 64,9% nos membros C0s, C1s e C2s, em 76% dos membros C3s e C4s e em 100% dos membros C5s e C6s (p<0,001). Os membros classificados como C3s apresentaram insuficiência venosa profunda em 20,5% dos casos, contrastando com apenas 5,2% nos restantes membros (p<0.001;OR:4,686). Conclus es: Os doentes classificados como sintomáticos foram mais frequentemente mulheres com idade =60 anos. A presen a de insuficiência da veia grande safena e de perfurantes mediais da perna correlacionou-se com a presen a de sintomas. Verificou-se uma associa o entre insuficiência de perfurantes mediais da perna e gravidade das manifesta es clínicas da classifica o CEAP. A presen a de insuficiência venosa profunda foi mais frequente em membros classificados como C3s. Objective: The aim of our study was to correlate the clinical manifestations of the CEAP classification with insufficiency at lower extremity venous ultrasound examination. Methods: Eight hundred and six extremities (corresponding to 403 consecutive patients) were evaluated by vascular ultrasonography during the investigation of chronic venous insufficiency. Results: Mean age of 46,8 years-old, 360 women and 43 men. There was a statistically significant difference between symptomatic patients according to gender, 62,5% women versus 44,2% men (p <0,001). Patients with =60 years-old were also more frequently classified as symptomatic (p <0,001) A symptomatic C class was more often attributed to limbs with great saphenous vein and medial leg perforators insufficiency. The extremities classified as asymptomatic, C1a and 2a, presented medial leg perforators insufficiency in only 36,4%, opposin
Accuracy of Prenatal Diagnosis in Elective Termination of Pregnancy: 385 Cases from 2000 to 2007
Fabiana Ramos,Sofia Maia,Miguel Branco,Joana Raposo
ISRN Obstetrics and Gynecology , 2011, DOI: 10.5402/2011/458120
Abstract:
Isolated Bulbar Conjunctival Kaposi’s Sarcoma as a Primary Presentation of AIDS: A Case Report
Sofia Maia,Miguel Gomes,Luís Oliveira,Paulo Torres
Case Reports in Ophthalmological Medicine , 2013, DOI: 10.1155/2013/469195
Abstract: Kaposi’s sarcoma (KS) is a malignant vascular tumor, caused by the human herpesvirus 8. It is one of the commonest tumors in human immunodeficiency virus (HIV) patients and not uncommonly the first manifestation of acquired immunodeficiency syndrome (AIDS). Case. We present a case of an isolated bulbar conjunctival KS on a 43-year-old HIV positive male, with no other lesions. Excision and cryotherapy were performed, and the patient remains free of lesions to date. Conclusion. Isolated bulbar conjunctival KP is an unusual site for its initial presentation and must be kept in mind in HIV positive patients. 1. Introduction Ocular manifestations of acquired immunodeficiency syndrome (AIDS) are varied, affecting almost all structures of the eye. The posterior segment is mainly affected; however, less frequently ocular adnexa, anterior segment, orbit, and neuroophthalmic lesions can also occur. Human immunodeficiency virus- (HIV-) associated disease occurs in 50–90% of patients in the course of their illness [1]. Kaposi’s sarcoma (KS) is the most common lesion of the anterior segment in these patients [2]. It is an AIDS defining illness and affects about 30% of the patients with HIV [2]. It may indicate worsening of the underlying disorder appearing in patients with CD4 count <500?cels/μ [1]. KS is a malignant neoplasm of the vascular endothelium that can affect the eyelids, the lacrimal sac or gland, the orbit, and bulbar or palpebral conjunctiva. Isolated KS of the conjunctiva was first reported in 1967 [3]. If it affects the conjunctiva, it appears as a bright red fleshy to violaceous nodular mass, commonly seen in the fornix [2, 4]. We report a clinical case of a patient with an isolated conjunctival KS and its treatment. 2. Case Report A 43-year-old HIV positive male since August 2010 presented with a three-month history (since December 2010) of a growing mass in the bulbar conjunctiva of the right eye. The patient had previously undergone right eye cataract extraction with insertion of intraocular lens in 1992 in another medical institution. On ophthalmic examination, the best corrected visual acuity was 20/25 on his right eye. The biomicroscopy revealed two reddish nodular lesions localized in the superior and inferior nasal bulbar conjunctiva, loosely connected to the underlying tissue (Figure 1). Fundoscopy was normal. The left eye showed no abnormalities. Screening and confirmatory tests were positive for HIV with CD4+ lymphocyte cell count of 154?cells/mm3. Figure 1: Preoperative biomicroscopy. An excisional biopsy and cryotherapy on the
High-Efficiency Stem Cell Fusion-Mediated Assay Reveals Sall4 as an Enhancer of Reprogramming
Connie C. Wong, Alexandre Gaspar-Maia, Miguel Ramalho-Santos, Renee A. Reijo Pera
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0001955
Abstract: Several methods allow reprogramming of differentiated somatic cells to embryonic stem cell-like cells. However, the process of reprogramming remains inefficient and the underlying molecular mechanisms are poorly understood. Here, we report the optimization of somatic cell fusion with embryonic stem cells in order to provide an efficient, quantitative assay to screen for factors that facilitate reprogramming. Following optimization, we achieved a reprogramming efficiency 15–590 fold higher than previous protocols. This allowed observation of cellular events during the reprogramming process. Moreover, we demonstrate that overexpression of the Spalt transcription factor, Sall4, which was previously identified as a regulator of embryonic stem cell pluripotency and early mouse development, can enhance reprogramming. The reprogramming activity of Sall4 is independent of an N-terminal domain implicated in recruiting the nucleosome remodeling and deacetylase corepressor complex, a global transcriptional repressor. These results indicate that improvements in reprogramming assays, including fusion assays, may allow the systematic identification and molecular characterization of enhancers of somatic cell reprogramming.
Associa??o entre a classifica??o CEAP e altera??es no Eco-doppler venoso dos membros inferiores
Maia,Miguel; Ferreira,Joana; Braga,Sandrina; Vasconcelos,Jo?o; Brand?o,Pedro; Canedo,Alexandra; Vaz,Guedes;
Angiologia e Cirurgia Vascular , 2010,
Abstract: objective: the aim of our study was to correlate the clinical manifestations of the ceap classification with insufficiency at lower extremity venous ultrasound examination. methods: eight hundred and six extremities (corresponding to 403 consecutive patients) were evaluated by vascular ultrasonography during the investigation of chronic venous insufficiency. results: mean age of 46,8 years-old, 360 women and 43 men. there was a statistically significant difference between symptomatic patients according to gender, 62,5% women versus 44,2% men (p <0,001). patients with =60 years-old were also more frequently classified as symptomatic (p <0,001) a symptomatic c class was more often attributed to limbs with great saphenous vein and medial leg perforators insufficiency. the extremities classified as asymptomatic, c1a and 2a, presented medial leg perforators insufficiency in only 36,4%, opposing to 64,9% of insufficiency in limbs classified as c0s, c1s and c2s, 76% in limbs graded c3s and c4s and to 100% of the limbs classified as c5s and c6s (p <0,001). in 20,5% of the extremities graded as c3s there was deep venous insufficiency on ultrasound, whereas in the other extremities only 5,2% had deep venous insufficiency. (p <0.001;or:4,686). conclusions: symptomatic patients were more frequently women with =60 years-old. great saphenous vein and medial leg perforators insufficiency correlated with the presence of symptoms. there was a significant association between medial leg perforators insufficiency and the severity of the clinical manifestations of ceap classification. deep venous insufficiency was more frequent in extremities classified as c3s.
Triterpenos da resina de Protium heptaphyllum March (B0urseraceae): caracteriza??o em misturas binárias
Maia, Robinson Magalh?es;Barbosa, Pedro Rocha;Cruz, Frederico Guaré;Roque, Nídia Franca;Fascio, Miguel;
Química Nova , 2000, DOI: 10.1590/S0100-40422000000500010
Abstract: eight triterpenes, maniladiol, breine, ursa-9(11):12-dien-3b-ol, oleana-9(11):12-dien-3b-ol, 3a-hydroxy-tirucalla-8,24-dien-21-oic acid, 3a-hydroxy-tirucalla-7,24-dien-21-oic, a and b amyrines were isolated as binary mixtures obtained from the chloroform extract of the oil-resin of protium heptaphyllum march. the identification of the compounds was based mainly in 13c nmr data and mass spectra. the diene and the tetracyclic acid triterpenes were not reported before in the literature as constituents of the studied resin.
Desfecho da gravidez nas jovens adolescentes
Metello, José;Torgal, Mariana;Viana, Rui;Martins, Luísa;Maia, Miguel;Casal, Estér;Hermida, Manuel;
Revista Brasileira de Ginecologia e Obstetrícia , 2008, DOI: 10.1590/S0100-72032008001200006
Abstract: purpose: to compare delivery and pregnancy follow-up among adolescent and non-adolescent pregnant women whose delivery occurred in a tertiary hospital from regi?o de lisboa (portugal). methods: retrospective study with 10,656 deliveries. pregnancy follow-up, delivery type, need of episiotomy and severe lacerations, apgar index at the fifth minute and the delivery weight have been evaluated. the pregnant women were divided into two groups, over and under 20 years old. the group with women under 20 was further subdivided in pregnant women under or over 16. the χ2 test has been used for statistical analysis. results: adolescents presented worse follow-up: first appointment after 12 weeks (46.4 versus 26.3%) and less than four appointments (8.1 versus 3.1%), less dystocia (21.5 versus 35.1%), less caesarian sections (10.6 versus 20.7%), and lower need for inducing labor (16.5 versus 26.5%). there was no significant difference concerning gestational age at delivery and ratio of low weight newborns. among adolescents, the ones under 16 had more low weight newborns (12 versus 7.4%) and more deliveries between 34 and 37 weeks (10.8 versus 4.2%). conclusions: in a hospital attending adolescents with social and psychological support, the fact of them having had a worse follow-up in the pre-natal phase, their performance has not been worse. nevertheless, special attention might be given to pregnant women under 16.
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