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DIALNET OAI Articles (538,592 recursos)
Dialnet (Difusión de Alertas en la Red) es una plataforma de recursos y servicios documentales, cuyo objetivo fundamental se centra en mejorar la visibilidad y el acceso a la literatura científica hispana a través de Internet.

Ciencias biológicas

Mostrando recursos 1 - 20 de 20,690

1. Archipiélagos macaronésicos (XIII) - Barone Tosco, Rubén; Rodríguez Navarro, María Leticia; Scholz, Stephan

2. Nuevas especies de invertebrados terrrestres de la Macaronesia - Oromí Masoliver, Pedro; López, Heriberto

3. Revalorización de los paisajes costeros europeos a través de los senderos litorales - Cano Delgado, José Juan

4. Donación al Museo de Ciencias Naturales de Tenerife - Ortega, Gloria; Bacallado Aránega, Juan José

5. Escrito en la arena: tubos y diques sedimentarios en paleodepósitos costeros de El Médano (Granadilla de Abona, Tenerife) - Coello, J. J.

6. La lapa majorera en Canarias: distribución y problemática - Núñez Fraga, Jorge; Brito Castro, María del Carmen; Docoito, José R.; Riera, Rodrigo; Monterroso Hoyos, Oscar

7. El medio subterráneo en la Macaronesia - Bacallado Aránega, Juan José; Oromí Masoliver, Pedro

8. Lanzarote: vida entre las lavas ahogadas del volcán - Martínez, Alejandro

9. Las trágicas crónicas de la lisa gigante de Cabo Verde - Mateo Miras, José Antonio

10. Memoria de actividades - Vera Hernández, Alejandro de; Medina Cabrera, María de los Angeles

11. Los aromas de Ceuta: dos mares, dos continentes - Bacallado Aránega, Juan José; Ocaña Vicente, Oscar; Moro Abad, Leopoldo; Navarrete, José; Ortea Rato, Jesús Ángel; Pérez Ruzafa, Angel

12. Conversación con Cristina González González - Barone Tosco, Rubén; Bacallado Aránega, Juan José

13. Tie2:: a journey from normal angiogenesis to cancer and beyond - Gomez Manzano, Candelaria
The tyrosine kinase receptor Tie2 was initially identified as a specific vascular growth factor that governed several properties of endothelial cells under both physiological and pathological conditions. It was subsequently found that angiopoietins, the natural ligands of Tie2, modulate Tie2-dependent signaling, which in turn regulates the survival and apoptosis of endothelial cells, controls vascular permeability, and regulates the capillary sprouting that occurs during normal angiogenesis such as through development and ovarian remodeling. Tie2 also seems to play a crucial role in several vascular abnormalities, such as familial venous malformations. Beyond its critical role in angiogenesis, Tie2 also appears to maintain...

14. Neuroectodermal ovarian tumors:: A Brief Overview - Morovic, Anamarija; Damjanov, Ivan
Primary neuroectodermal tumors of the ovary are rare monophasic teratomas composed exclusively or almost exclusively of neuroectodemal tissue. Approximately 60 neuroectodermal tumors of the ovary have been reported in the literature. These tumors were classified as ependymoma, astrocytoma, glioblastoma multiforme, ependymoblastoma or as primitive neuroepithelial tumors such as medullo-blastoma, medulloepithelioma and neuroblastoma. Most tumors were diagnosed in the third and fourth decades of life, but occasionally they were first discovered in children, adolescents or older women. Microscopically, they are identical to equivalent neuroectodermal tumors of the central nervous system. The review of the litarature shows that most patients with clinical...

15. Lamin A/C, laminopathies and premature ageing - Zhou, Zhongjun; Liu, Baohua
Lamin A/C belongs to type V intermediate filaments and constitutes the nuclear lamina and nuclear matrix, where a variety of nuclear activities occur. Lamin A/C protein is firstly synthesized as a precursor and is further proteolytically processed by the zinc metallo-proteinase Ste24 (Zmpste24). Lamin A/C mutations cause a series of human diseases, collectively called laminopathies, the most severe of which is Hutchinson Gilford progeria syndrome (HGPS) and restrictive dermopathy (RD) which arises due to an unsuccessful maturation of prelamin A. Although the exact underlying molecular mechanisms are still poorly understood, genomic instability, defective nuclear mechanics and mechanotransduction, have been hypothesized...

16. Embryonic stem cells markers are present within rabbit atherosclerotic plaques - Zulli, Anthony
Recent evidence suggests that smooth muscle cells within atherosclerotic plaques originate from vascular progenitor cells. We have previously shown that smooth muscle cells and macrophages present within rabbit atherosclerotic plaques are positive for factors of the renin angiotensin and nitric oxide systems as well as the hematopoietic stem-cell marker CD34 and the pan-leukocyte marker CD45. To explore the idea that these cells are of primitive types, immunohistochemistry was used to identify pluripotent embryonic stem cells (ESC) markers (Oct-4, SSEA1,3,4, TRA1-60, 81) in these plaques and to compare these to intimal thickening. Objective: To immunolocalise ESC markers in rabbit aortic intimal...

17. Diabetic nephropathy, inflammation, hyaluronan and interstitial fibrosis - Phillips, Aled O.
Hyaluronan (HA) is a ubiquitous connective tissue glycosaminoglycan component of most extracellular matrices and alterations in its synthesis have been suggested to be involved in the glomerular changes of diabetic nephropathy. Similarly it has been suggested that macrophages are involved in the initiation of diabetic glomerular injury. Much less is known regarding the role of the prognostic value of changes in interstitial HA and interstitial inflammatory infiltrate. The aim of this study was to examine the potential association of inflammatory infiltrate, deposition of the matrix component hyaluronan and inter-alpha inhibitor (which is involved in HA assembly) and clinical outcome in...

18. Cisplatin treatment of NIH/3T3 cultures induces a form of autophagic death in polyploid cells - Sciola, Luigi
The effects induced by different concentrations (50, 75, 100 µM) of the cytostatic drug cisplatin (cDDP) in NIH/3T3 cells were analyzed. Sub-confluent cultures of this mouse fibroblast line, obtained after serum deprivation, showed the presence of aneuploid/polyploid cells with ploidy values ranging from 4c to 24c. DNA content cytofluorometry demonstrated that 50 and 75 µM cDDP induced a cytostatic effect; 100 µM concentration showed lower antiproliferative action. All treatments caused a partial cell detachment and apoptosis, the incidence of which appeared to be cDDP concentration-dependent. Ultrastructural and fluorescence microscopy integrated analyses of the still adherent cells demonstrated the presence of...

19. Receptor activator of nuclear factor-?B ligand (RANKL) as a novel prognostic marker in prostate carcinoma - Esbrit Arguelles, P.
Combined immunodetection of parathyroid hormone-related protein (PTHrP) and receptor activator of NF-?B ligand (RANKL) has shown to successfully distinguish poorly- and well-differentiated prostate carcinoma (PCa). In the present study, we aimed to assess whether immunohistochemical evaluation of these factors, and also osteoprotegerin (OPG) and Ki67, in radical prostatectomy specimens can predict biochemical recurrence. Fifty nine PCa cases undergoing radical prostatectomy between 1995 and 1998, without history of neoadjuvant hormonal therapy, were studied. Preoperative serum prostate-specific antigen (PSA), Gleason-sum score, pathologic stage, perineural invasion, seminal vesicle involvement, and positive surgical margins were assessed in these patients. Biochemical recurrence, defined by PSA...

20. Endoglin (CD105) immuno-expression in human foetal and neonatal lungs - Barresi, Valeria
Endoglin is a 180 KDa glycoprotein mainly expressed on endothelial cells of newly formed vessels. Its expression is increased by the hypoxia inducible factor 1 (HIF-1), a potent stimulator of VEGF expression. The relative hypoxic environment in which foetal lung develops favours HIF-1 dependent gene expression, including the endoglin and VEGF ones. Herein, we analysed endoglin immunoexpression in the human neonatal and foetal lung throughout gestation. Lungs from 18 foetuses (9-41 weeks), 7 preterm and 2 term infants were submitted to the immunohistochemical study. A slight immunostaining was found in some mesenchymal aggregates in the lungs of foetuses at the...

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