16 results on '"Arencibia R"'
Search Results
2. Evaluation of Bacteriological Quality in Artisanal Juices Issued at Carabobo University. Faculty of Health Sciences. Bable Core
- Author
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Noja Izzeddin, Barreto G Martha, Arencibia R Angely, and Luis Medina
- Subjects
Medical education ,Engineering ,Core (game theory) ,business.industry ,media_common.quotation_subject ,Geography, Planning and Development ,University faculty ,Quality (business) ,Management, Monitoring, Policy and Law ,business ,media_common - Published
- 2020
- Full Text
- View/download PDF
3. Processing and analysis of freeform implants obtained by additive manufacturing from MRI data
- Author
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Piratelli-Filho, A, primary, Arencibia, R V, additional, and Silva-Junior, J F, additional
- Published
- 2021
- Full Text
- View/download PDF
4. Mnb/Dyrk1A is transiently expressed and asymmetrically segregated in neural progenitor cells at the transition to neurogenic divisions
- Author
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Hammerle, B., Vera-Samper, E., Speicher, S., Arencibia, R., Martinez, S., and Tejedor, F.J.
- Subjects
Developmental genetics -- Research ,Protein kinases -- Genetic aspects ,Neurogenetics -- Research ,Genetic regulation -- Research ,Biological sciences - Abstract
The Minibrain (Mnb) gene encodes a new family of protein kinases that is evolutionarily conserved from insects to humans. In Drosophila, Mnb is involved in postembryonic neurogenesis. In humans, MNB has been mapped within the Down's Syndrome (DS) critical region of chromosome 21 and is overexpressed in DS embryonic brain. In order to study a possible role of Mnb on the neurogenesis of vertebrate brain, we have cloned the chick Mnb orthologue and studied the spatiotemporal expression of Mnb in proliferative regions of the nervous system. In early embryos, Mnb is expressed before the onset of neurogenesis in the three general locations where neuronal precursors are originated: neuroepithelia of the neural tube, neural crest, and cranial placodes. Mnb is transiently expressed during a single cell cycle of neuroepithelial progenitor (NEP) cells. Mnb expression precedes and widely overlaps with the expression of Tis21, an antiproliferative gene that has been reported to be expressed in the onset of neurogenic divisions of NEP cells. Mnb transcription begins in mitosis, continues during [G.sub.1], and stops before S-phase. Very interestingly, we have found that Mnb mRNA is asymmetrically localized during the mitosis of these cells and inherited by one of the sibling cells after division. We propose that Mnb defines a transition step between proliferating and neurogenic divisions of NEP cells. Key Words: Minibrain; Mnb; Dyrk1A; brain development; proliferation; neurogenesis; progenitor cells; asymmetric division.
- Published
- 2002
5. Roughness analysis of electrochemically textured surfaces: effects on friction and wear of lubricated contacts
- Author
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Rodrigues, T A, primary, Arencibia, R V, additional, Costa, H L, additional, and da Silva, W M, additional
- Published
- 2020
- Full Text
- View/download PDF
6. Determination of the uncertainty of microhardness in the evaluation of hardfacing obtained by welding
- Author
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Cruz-Crespo, A, primary, Leal, J E S, additional, Piratelli-Filho, A, additional, Mendez, T O, additional, and Arencibia, R V, additional
- Published
- 2015
- Full Text
- View/download PDF
7. Mnb/Dyrk1A is transiently expressed and asymmetrically segregated in neural progenitor cells at the transition to neurogenic divisions
- Author
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European Commission, Fundación la Caixa, Fundación Séneca, Fundación Mapfre, Hämmerle, Barbara, Vera-Samper, Eva, Speicher, Stephan, Arencibia, R., Martínez, Salvador, Tejedor, Francisco J., European Commission, Fundación la Caixa, Fundación Séneca, Fundación Mapfre, Hämmerle, Barbara, Vera-Samper, Eva, Speicher, Stephan, Arencibia, R., Martínez, Salvador, and Tejedor, Francisco J.
- Abstract
The Minibrain (Mnb) gene encodes a new family of protein kinases that is evolutionarily conserved from insects to humans. In Drosophila, Mnb is involved in postembryonic neurogenesis. In humans, MNB has been mapped within the Down's Syndrome (DS) critical region of chromosome 21 and is overexpressed in DS embryonic brain. In order to study a possible role of Mnb on the neurogenesis of vertebrate brain, we have cloned the chick Mnb orthologue and studied the spatiotemporal expression of Mnb in proliferative regions of the nervous system. In early embryos, Mnb is expressed before the onset of neurogenesis in the three general locations where neuronal precursors are originated: neuroepithelia of the neural tube, neural crest, and cranial placodes. Mnb is transiently expressed during a single cell cycle of neuroepithelial progenitor (NEP) cells. Mnb expression precedes and widely overlaps with the expression of Tis21, an antiproliferative gene that has been reported to be expressed in the onset of neurogenic divisions of NEP cells. Mnb transcription begins in mitosis, continues during G1, and stops before S-phase. Very interestingly, we have found that Mnb mRNA is asymmetrically localized during the mitosis of these cells and inherited by one of the sibling cells after division. We propose that Mnb defines a transition step between proliferating and neurogenic divisions of NEP cells.
- Published
- 2002
8. Indicadores de estrés oxidativo y efecto del tratamiento antioxidante en pacientes con enfermedad de Parkinson primaria
- Author
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Gómez Aa, Arencibia R, García Jc, Castellano O, Céspedes Em, Broche F, and González-Fraguela Me
- Subjects
medicine.medical_specialty ,Pathology ,Antioxidant ,Vitamin C ,biology ,business.industry ,medicine.medical_treatment ,Dopaminergic ,General Medicine ,Metabolism ,Disease ,medicine.disease_cause ,Endocrinology ,Phospholipase A2 ,Catalase ,Internal medicine ,medicine ,biology.protein ,Neurology (clinical) ,business ,Oxidative stress - Abstract
INTRODUCTION AND OBJECTIVE Parkinson's disease (PD) is characterized by a progressive, slow loss of dopaminergic neurones in the substance nigra. Although the cause of this neurone loss is unknown, at the present time many papers suggest oxidative stress (OS), secondary to dopaminergic metabolism, as an aetiopathogenic factor of PD. Therefore study of the part played by OS in this would permit the use of antioxidants (AO) as another possibility for treatment of the disease. It would also be a major step forward in the search for possible biological markers. MATERIAL AND METHODS A study using spectrophotometric techniques was made of the serum levels of four biochemical indicators: catalase (CAT), malonyl aldehyde (MDA), phospholipase A2 (PLA2) and Vitamin C (VITC) in controls and in patients with PD. We found the average value for each of the variables studied in controls and in patients, taking AO treatment into account. RESULTS The effect of clinical variables on serum levels of CAT, MDA, PLA2 and VITC was analyzed. It was seen that only the clinical state of Hoen and Yahr was related to the biochemical indicators. The CAT activity and VITC concentration showed statistically significant differences between patients (independently of their AO treatment) and controls. The CAT activity was significantly less in those treated with AO. The patients with PD did not all have the same degree of OS. The effect of AO treatment on plasma markers showed changes only in one subgroup of Parkinson patients. CONCLUSIONS Our study suggests that AO treatment in this condition should be tailored to the individual patient according to the degree of OS present.
- Published
- 1998
- Full Text
- View/download PDF
9. DUODÉCIMO GRADO EN LA UNIVERSIDAD DE LA HABANA: ¿PALIATIVO, O ESTRATEGIA DEFINITIVA?
- Author
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FUNDORA-ARENCIBIA, R. and CALDERÓN-ARIOSA, R. M.
- Abstract
Desde el curso 2009-2010 se aplica una experiencia con los estudiantes de onceno grado interesados en cursar carreras de Matemática, Física, Química y Ciencias Biológicas, como parte de los esfuerzos que se realizan para elevar el nivel de entrada exigido por la enseñanza superior y mejorar los índices de acceso y permanencia en estas carreras. Estos estudiantes son seleccionados de acuerdo a los resultados obtenidos en los llamados "exámenes de requisitos adicionales" establecidos por cada facultad universitaria, para cursar el duodécimo grado en la universidad bajo la dirección de profesores universitarios. En este artículo se explican algunas de las acciones realizadas en la enseñanza de la Física con estos estudiantes en el caso de la Universidad de La Habana, dirigidas a garantizar una asimilación más eficiente de los conceptos, leyes y teorías de la asignatura, una mayor independencia en su actuación, un desarrollo superior de sus habilidades prácticas e intelectuales y la elevación de su interés por la Física. Since the academic year 2009-2010, a new plan has been applied to 11th grade students who are interested in pursuing higher level education in Mathematics, Physics, Chemistry and Biological Sciences, as an effort to increase the knowledge demanded by the university level, and to improve the indices of access and permanence in the careers mentioned above. Based on their performance in the "additional requisites" exams established by the higher education institutions, these students are selected to take the 12th grade at the universities, under the guidance of university staff. In this paper we explain some of the actions taken on these students at the University of Havana in order to improve their learning of the concepts, laws and theories of Physics, to increase their independence, to develop their practical and intellectual abilities, and to raise their interest in Physics. [ABSTRACT FROM AUTHOR]
- Published
- 2013
10. [Indicators of oxidative stress and the effect of antioxidant treatment in patients with primary Parkinson disease]
- Author
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Me, González-Fraguela, Em, Céspedes, Arencibia R, Broche F, Aa, Gómez, Orlando J. Castellano Benítez, and Jc, García
- Subjects
Monoamine Oxidase Inhibitors ,Parkinson Disease ,Ascorbic Acid ,Catalase ,Antioxidants ,Phospholipases A ,Oxidative Stress ,Phospholipases A2 ,Spectrophotometry ,Malondialdehyde ,Disease Progression ,Humans ,Vitamin E ,Reactive Oxygen Species ,Biomarkers - Abstract
Parkinson's disease (PD) is characterized by a progressive, slow loss of dopaminergic neurones in the substance nigra. Although the cause of this neurone loss is unknown, at the present time many papers suggest oxidative stress (OS), secondary to dopaminergic metabolism, as an aetiopathogenic factor of PD. Therefore study of the part played by OS in this would permit the use of antioxidants (AO) as another possibility for treatment of the disease. It would also be a major step forward in the search for possible biological markers.A study using spectrophotometric techniques was made of the serum levels of four biochemical indicators: catalase (CAT), malonyl aldehyde (MDA), phospholipase A2 (PLA2) and Vitamin C (VITC) in controls and in patients with PD. We found the average value for each of the variables studied in controls and in patients, taking AO treatment into account.The effect of clinical variables on serum levels of CAT, MDA, PLA2 and VITC was analyzed. It was seen that only the clinical state of Hoen and Yahr was related to the biochemical indicators. The CAT activity and VITC concentration showed statistically significant differences between patients (independently of their AO treatment) and controls. The CAT activity was significantly less in those treated with AO. The patients with PD did not all have the same degree of OS. The effect of AO treatment on plasma markers showed changes only in one subgroup of Parkinson patients.Our study suggests that AO treatment in this condition should be tailored to the individual patient according to the degree of OS present.
11. Produccion de Biomasa de Scenedesmus Obliquus en diferentes medios de cultivo.
- Author
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Martínez, V., Pellón, A., Pérez, E., Correa, O., Escobedo, R., Madruga, Y., Oña, A., and Arencibia, R.
- Subjects
- *
PLANT nutrients , *BIOMASS , *SCENEDESMUS obliquus , *CHLOROPHYLL , *HYDROGEN-ion concentration , *ALGAE - Abstract
The nutrients are fundamental factors that affect the yield of the microalgal cultures, of there the importance of carry out studies to laboratory scale with species of commercial and scientific interest. To such an effect was investigated the biomass production of Scenedesmus obliquus. in different cultures. Two reactors type columns of 2 L of capacity were used using culture Extract of soil, and culture Synthetic Sewer, respectively, the inoculum of culture was added at (1 %) in the logaritmic phase of the growth. To keep homogeneous and agitated the system was supplied air to reason 100 L/h that was measured with the flow regulator and they were placed in a local whose temperature mean was 29,7 °C. The reactors worked in discontinuous way (batch). they stayed with a regime of dark/light of 8/16 hours during 16 days. To follow the behavior of the culture, the optic Density, the chlorophyll a, the volatile suspended solids, the pH and the production of biomass in the system was determined. The speed of specific growth μ was calculated = 0,16 d-1 for the culture in the Extract of soil and μ = 0,33 d-1 for the synthetic Sewer culture. The time of duplication was of 4,33 d'-1 for the culture AES and 2,10 d-1 for the Synthetic Sewer culture. A better behavior of the algae investigated was observed in the Synthetic Sewer culture. [ABSTRACT FROM AUTHOR]
- Published
- 2005
12. A bibliometric study of international scientific productivity in giardiasis covering the period 1971-2010.
- Author
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Escobedo AA, Arencibia R, Vega RL, Rodríguez-Morales AJ, Almirall P, and Alfonso M
- Subjects
- Adolescent, Adult, Aged, Aged, 80 and over, Animals, Child, Child, Preschool, Giardiasis diagnosis, Giardiasis drug therapy, Global Health, Humans, Infant, Middle Aged, Young Adult, Bibliometrics, Biomedical Research statistics & numerical data, Giardiasis epidemiology, Giardiasis prevention & control
- Abstract
Introduction: Despite years of relative neglect, interest in Giardia infection seems to be recently growing, perhaps in part due to its inclusion into the World Health Organization's Neglected Diseases Initiative since 2004. The purpose of this study was to provide an overview of Giardia and giardiasis research over time, as represented by the quantity of published papers., Methodology: Data for this study were collected from the electronic PubMed/Medline database of National Library of Medicine's (NLM), due to it is easily accessibility and wide use. It was accessed online between April and December 2011. Data for the period 1971-2010 were obtained and information was downloaded using the EndNote program developed by Thomson Reuters., Results: During the study period, a total of 6,964 references (articles, reviews, editorials, letter to the editor, etc.) covering different aspects of Giardia and giardiasis were located in the PubMed database after applying the search strategy reported above. Most papers were original articles and published in English., Conclusions: In this first effort to explore the development and research productivity on giardiasis over time (no previously published bibliometric studies on giardiasis exist), two interesting characteristics of the Giardia and giardiasis literature were discovered: the concentration of papers over journals disseminating the research results, and that research in this field is growing and will likely continue to grow in the coming years.
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- 2015
- Full Text
- View/download PDF
13. [Hyperbaric oxygen in vertebro-basilar ischemia].
- Author
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Martínez-Arencibia RL, Enríquez S, and Brito L
- Subjects
- Arterial Occlusive Diseases complications, Brain Ischemia etiology, Humans, Basilar Artery, Brain Ischemia therapy, Hyperbaric Oxygenation methods, Vertebral Artery
- Published
- 1998
14. [Indicators of oxidative stress in aging rat brain. The effect of nerve growth factor].
- Author
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Rodríguez-Capote K, Céspedes E, Arencibia R, and González-Hoyuela M
- Subjects
- Animals, Antioxidants therapeutic use, Brain drug effects, Brain-Derived Neurotrophic Factor pharmacology, Catalase metabolism, Glutathione metabolism, Male, Nerve Growth Factors pharmacology, Peroxidase metabolism, Phospholipases A metabolism, Phospholipases A2, Rats, Rats, Sprague-Dawley, Superoxide Dismutase metabolism, Aging physiology, Brain enzymology, Brain-Derived Neurotrophic Factor physiology, Nerve Growth Factors physiology, Oxidative Stress physiology
- Abstract
Introduction and Objective: Increased oxidative stress during ageing and the neurodegenerative disorders associated with this has been described. The central nervous system is particularly vulnerable to oxidative damage because of its high energy requirements, high oxygen consumption, high tissue concentration of iron and relatively low levels of some antioxidant systems. Treatment with neurotrophic factors may reverse neurone deterioration and stimulate cholinergic activity in aged rats. It may have a similar neuroprotector effect against damage due to ischaemic reperfusion, hypoglycaemia, inflammation and other pathological conditions involving oxidative stress. In this study we determined some indicators of oxidative stress in rat brains during ageing and evaluated this in response to a plan of treatment with murine nerve growth factor (FCN) for 38 days., Material and Methods: Biochemical techniques were used for determination of oxidative stress indicators., Results and Conclusions: We found that with age there was a significant increase in phospholipase A2 and superoxide dysmutase activity and concentration of hipoperoxidases, whilst the concentration of reduced glutathion fell. Catalase activity increased in the hippocampal and striate regions and decreased in the cortex and septal area. There was less oxidative stress in rats treated with FCN. In view of our results, we conclude that the level of oxidative stress increases with ageing, with significant differences between areas of the brain. The region most vulnerable to damage from species reactive to oxygen was the hippocampus, and the protective effect of FCN may be related to potentiation of antioxidant defenses.
- Published
- 1998
15. [Indicators of oxidative stress and the effect of antioxidant treatment in patients with primary Parkinson disease].
- Author
-
González-Fraguela ME, Céspedes EM, Arencibia R, Broche F, Gómez AA, Castellano O, and García JC
- Subjects
- Ascorbic Acid blood, Biomarkers, Catalase blood, Disease Progression, Humans, Malondialdehyde blood, Parkinson Disease enzymology, Phospholipases A blood, Phospholipases A metabolism, Phospholipases A2, Reactive Oxygen Species metabolism, Spectrophotometry methods, Antioxidants pharmacology, Antioxidants therapeutic use, Ascorbic Acid pharmacology, Ascorbic Acid therapeutic use, Monoamine Oxidase Inhibitors pharmacology, Monoamine Oxidase Inhibitors therapeutic use, Oxidative Stress drug effects, Parkinson Disease drug therapy, Vitamin E pharmacology, Vitamin E therapeutic use
- Abstract
Introduction and Objective: Parkinson's disease (PD) is characterized by a progressive, slow loss of dopaminergic neurones in the substance nigra. Although the cause of this neurone loss is unknown, at the present time many papers suggest oxidative stress (OS), secondary to dopaminergic metabolism, as an aetiopathogenic factor of PD. Therefore study of the part played by OS in this would permit the use of antioxidants (AO) as another possibility for treatment of the disease. It would also be a major step forward in the search for possible biological markers., Material and Methods: A study using spectrophotometric techniques was made of the serum levels of four biochemical indicators: catalase (CAT), malonyl aldehyde (MDA), phospholipase A2 (PLA2) and Vitamin C (VITC) in controls and in patients with PD. We found the average value for each of the variables studied in controls and in patients, taking AO treatment into account., Results: The effect of clinical variables on serum levels of CAT, MDA, PLA2 and VITC was analyzed. It was seen that only the clinical state of Hoen and Yahr was related to the biochemical indicators. The CAT activity and VITC concentration showed statistically significant differences between patients (independently of their AO treatment) and controls. The CAT activity was significantly less in those treated with AO. The patients with PD did not all have the same degree of OS. The effect of AO treatment on plasma markers showed changes only in one subgroup of Parkinson patients., Conclusions: Our study suggests that AO treatment in this condition should be tailored to the individual patient according to the degree of OS present.
- Published
- 1998
16. [Urodynamics of the lower urinary tract in patients with prostatic adenoma and cancer before and after transurethral surgery].
- Author
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Caravia Pubillones I, Bardo Toscano M, Alonso Rodríguez L, Reyes Arencibia R, and Cruz Reyes R
- Subjects
- Humans, Male, Manometry instrumentation, Manometry methods, Prostatic Hyperplasia surgery, Prostatic Neoplasms surgery, Urodynamics, Prostatectomy, Prostatic Hyperplasia physiopathology, Prostatic Neoplasms physiopathology, Urinary Tract physiopathology
- Abstract
Combined urodynamic investigation, including uroflowmetry, cystomanometry and intraurethral pressure profile (IPP) assessment, was carried out in 25 patients with prostatic adenomas and carcinomas, selected to undergo transurethral electroresection (TUR). The same combined investigation was repeated 2 months after TUR in 14 of 25 patients. The study of lower urinary urodynamics made use of Diza-2100 (Denmark) measuring system, recording maximum and mean volumetric urinary flow rate, volume and duration of micturition. The quantity of residual urine was also determined; the bladder was filled with CO2 at the rate of 50 ml/min for retrograde cystomanometry. In IPP assessment, the rate of catheter removal from the bladder was 1 mm/sec, and the rate of gas perfusion was 10 ml/min. Post-TUR follow-up revealed an increase of volumetric micturition rate to normal values, a drop in maximum intravesical pressure, and a reduction of functional length of the urethra and its prostatic segment, demonstrating that TUR is a very effective method of treatment for prostatic adenomas and carcinomas, involving little injury, and that the examined parameters of lower urinary urodynamics are objective indicators of treatment efficiency.
- Published
- 1989
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