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Search Results: 1 - 10 of 362 matches for " Leonidas Zografos "
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Choroidal metastases in testicular choriocarcinoma, successful treatment with chemo- and radiotherapy: a case report
Ivo Guber, Leonidas Zografos, Ann Schalenbourg
BMC Urology , 2011, DOI: 10.1186/1471-2490-11-24
Abstract: A 26-year-old Caucasian man, suffering from testicular choriocarcinoma with pulmonary, cerebral, renal, hepatic and osseous metastases, underwent left radical orchiectomy. While being treated with chemotherapy, he presented with loss of vision in the left eye. Ophthalmoscopy revealed bilateral non-pigmented, hemorrhagic choroidal tumours, compatible with secondary lesions. Continued chemotherapy and stereotactic radiotherapy of the skull and spine lead to full remission with excellent vision, after more than 4 years of follow up.Testicular choriocarcinoma is an exceptional cause of choroidal metastasis, potentially asymptomatic and with specific clinical features. Radiotherapy can complement radical orchiectomy and chemotherapy, to achieve full remission and maintain good vision.Intraocular metastases are present in up to 10% of patients with systemic malignancies [1]. With tumour cells spreading hematogenously, the posterior choroid is frequently involved because of its rich vasculature [2]. In females, the most common primary site is the breast, whereas, in males, it is the lung.Choriocarcinoma is a highly malignant metastatic tumour, derived from undifferentiated placental trophoblasts ('gestational choriocarcinoma') or from non-placental totipotent cells, present in the testis, the ovary or the pineal gland ('non gestational choriocarcinoma'). It is characterized by the large amounts of chorionic gonadotropin produced.Choriocarcinoma is a rare cause of choroidal metastasis. Only 18 male patients have been reported on, and most of them had a poor prognosis [2-4]. We present a man who developed bilateral choroidal metastases from a testicular choriocarcinoma under chemotherapy. The ocular tumours regressed following irradiation. Four years later, he is in remission and has excellent vision.A 26-year-old man was referred to the Jules-Gonin Eye Hospital with loss of vision and a non-pigmented tumour in his left eye. In the previous two weeks, he had been diagnosed w
A clinical study of annular cyclitis
Marilita Michael Moschos, Yan Guex-Crosier, Ioannis Margetis, Leonidas Zografos
Clinical Ophthalmology , 2009, DOI: http://dx.doi.org/10.2147/OPTH.S4915
Abstract: clinical study of annular cyclitis Original Research (4510) Total Article Views Authors: Marilita Michael Moschos, Yan Guex-Crosier, Ioannis Margetis, Leonidas Zografos Published Date February 2009 Volume 2009:3 Pages 215 - 217 DOI: http://dx.doi.org/10.2147/OPTH.S4915 Marilita Michael Moschos1, Yan Guex-Crosier2, Ioannis Margetis1, Leonidas Zografos2 1Department of Ophthalmology, University of Athens, Greece; 2Jules Gonin Eye Hospital, University of Lausanne, Switzerland Purpose: To investigate six cases of annular cyclitis. Methods: All patients with impairment of visual acuity underwent complete ophthalmologic examination, color fundus photography, laboratory tests and fluorescein angiography. Indocyanine green (ICG) angiography and B-scan ultrasonography were also performed in three cases in order to diagnose the disease. Results: All patients presented a unilateral or bilateral granulomatous uveitis, associated with inflammatory annular cyclitis. They had a shallow anterior chamber, a mildly elevated intraocular pressure (under 25 mm Hg) and an annular serous retinal detachment. A resolution was observed after specific therapy associated with systemic prednisolone therapy and antiglaucomatous drops. Conclusion: This is the first description of an observational study of six patients with inflammatory annular cyclitis.
A clinical study of annular cyclitis
Marilita Michael Moschos,Yan Guex-Crosier,Ioannis Margetis,Leonidas Zografos
Clinical Ophthalmology , 2009,
Abstract: Marilita Michael Moschos1, Yan Guex-Crosier2, Ioannis Margetis1, Leonidas Zografos21Department of Ophthalmology, University of Athens, Greece; 2Jules Gonin Eye Hospital, University of Lausanne, SwitzerlandPurpose: To investigate six cases of annular cyclitis.Methods: All patients with impairment of visual acuity underwent complete ophthalmologic examination, color fundus photography, laboratory tests and fluorescein angiography. Indocyanine green (ICG) angiography and B-scan ultrasonography were also performed in three cases in order to diagnose the disease.Results: All patients presented a unilateral or bilateral granulomatous uveitis, associated with inflammatory annular cyclitis. They had a shallow anterior chamber, a mildly elevated intraocular pressure (under 25 mm Hg) and an annular serous retinal detachment. A resolution was observed after specific therapy associated with systemic prednisolone therapy and antiglaucomatous drops.Conclusion: This is the first description of an observational study of six patients with inflammatory annular cyclitis.Keywords: cyclitis, uveitis, malignant glaucoma
The Distribution of the Stress Protein HSP70 in the Cerebellum of Patients with Schizophrenia  [PDF]
Makris Leonidas
Neuroscience & Medicine (NM) , 2012, DOI: 10.4236/nm.2012.34045
Abstract: Data accumulated from neuro-imaging, clinical and morphological studies suggest that the cerebellum is involved in cognitive functions and thus may be important in the etiopathogenesis of schizophrenia, since patients show cognitive abnormalities. In the present study, we have attempted to localize cellular metabolic dysfunctions applying the immunohistochemical and Western blot method to demonstrate the expression of the stress protein HSP70, which is a marker of cellular metabolic dysfunction in the brain. We studied the post mortem brains’ cerebellum of 12 normal controls and 10 schizophrenics. We have used the polyclonal antibody rabbit anti-HSP70 on paraffin sections as well as on nitrocellulose membranes. Bound antibody was detected using the indirect method of streptavidin-peroxidase-DAB. The results in the cerebellum of controls showed intense HSP70 immunoreaction in the synaptic glomeruli of the granular cell layer, in the cytoplasm and dendrites of Purkinje cells. In the same areas of the cerebellum of schizophrenics the HSP70 immunoreactivity was minimal. These results suggest that the reduced levels of HSP70 in the cerebellum are likely to contribute synergistically to the cognitive dysfunction in schizophrenia. This may suggest abnormality of protective neural mechanisms in such pathological conditions.
3D planar patch extraction from stereo using probabilistic region growing
Vasileios Zografos
Computer Science , 2014,
Abstract: This article presents a novel 3D planar patch extraction method using a probabilistic region growing algorithm. Our method works by simultaneously initiating multiple planar patches from seed points, the latter determined by an intensity-based 2D segmentation algorithm in the stereo-pair images. The patches are grown incrementally and in parallel as 3D scene points are considered for membership, using a probabilistic distance likelihood measure. In addition, we have incorporated prior information based on the noise model in the 2D images and the scene configuration but also include the intensity information resulting from the initial segmentation. This method works well across many different data-sets, involving real and synthetic examples of both regularly and non-regularly sampled data, and is fast enough that may be used for robot navigation tasks of path detection and obstacle avoidance.
DRAMATIC CHANGES IN THE CONTINUOUSLY EVOLVING TOURIST DESTINATIONS: THE CASE OF PARALIA IN PIERIA
George Zografos,Alex Deffner
Tourismos : an International Multidisciplinary Journal of Tourism , 2009,
Abstract: This paper examines the evolution of ‘Paralia’ as a key mass tourism destination in northern Greece. The paper analyses the changes which are brought to a destination as a result of its main markets’ current socio-economic situation. Thus, it draws conclusions about the vulnerability of destinations, and how trends in key markets can move destinations to the various stages of the so-called Destination’s Life Cycle. The primary data are derived from a questionnaire survey addressed to citizens. The results of the survey seem to verify previous analyses about the area. Local people tend to compromise with the current situation. At the end, courses of action are suggested which could help the destination to move away from insecurity and stagnation. Proposals based on the outline of the destination’s strengths and weaknesses, opportunities and threats include the organisation of special events throughout the year and incentives for the attraction of residents from neighbouring urban centres.
Affine Invariant, Model-Based Object Recognition Using Robust Metrics and Bayesian Statistics
Vasileios Zografos,Bernard Buxton
Computer Science , 2010, DOI: 10.1007/11559573_51
Abstract: We revisit the problem of model-based object recognition for intensity images and attempt to address some of the shortcomings of existing Bayesian methods, such as unsuitable priors and the treatment of residuals with a non-robust error norm. We do so by using a refor- mulation of the Huber metric and carefully chosen prior distributions. Our proposed method is invariant to 2-dimensional affine transforma- tions and, because it is relatively easy to train and use, it is suited for general object matching problems.
Surfactant Adsorbed at the Oil-Water Interface and Its Elimination  [PDF]
Linfeng Yang, Leonidas Perez Estrada
Journal of Geoscience and Environment Protection (GEP) , 2015, DOI: 10.4236/gep.2015.32007
Abstract:

Surfactants are widely used in the petroleum industry as one kind of Enhanced Oil Recovery methods (EOR). The oil sands mines in Northern Alberta are the largest one in the world. Due to using sodium hydroxide in bitumen extraction process, there are a lot of surfactant molecules in the tailing water. The surfactants from oil sands industry have brought a potential threat to the environment and human health. Depending on the performance of surfactant at the interface, this work focuses on removing these harmful surfactants from the tailing water and not bringing other possible hazardous substances. Moreover, a mathematical model is built to calculate the removal efficiency of the surfactant. The time required for removing the surfactant is determined experimentally. In conclusion, most of surfactant molecules are adsorbed at the oil/water interface. The fraction of the surfactant staying at the oil/water interface is high. Most of the surfactants in tailing water can be eliminated. The time of surfactant migration can be used for setting up the update time of the oil film in the automatic instrument, which can be designed in the future.

Diamela Eltit: El ensayo como estrategia narrativa
Morales,Leonidas;
Atenea (Concepción) , 2004, DOI: 10.4067/S0718-04622004049000008
Abstract: the central hypothesis of this critical text is that eltit?s novels are permeated by a strategy: that of the essay, as understood in the etymological sense of the word, as an "attempt" or "experiment". nothing is definitive in these novels, neither the subject nor the discourse: the subject is always a figure in movement, in transit and the discourse constructs and reconstructs itself right before the reader?s eyes. without a doubt this is a "post-vanguard" strategy or, also, "post-modern", whose meaning the critical text tries to situate in the context of the contemporary chilean novel. even when the experimental strategy runs through all of eltit?s narrative order, the quotes privilege the novel por la patria.
Money and War Murray Rothbard’s A History of Money and Banking in the United States
Leonidas Zelmanovitz
Libertarian Papers , 2010,
Abstract: This paper is a presentation and an interpretation of Murray Rothbard’s views on the relation between the fiscal necessities brought by war and interventionism in Money and Banking as read from his book A History of Money and Banking in the United States.
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