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Search Results: 1 - 10 of 205196 matches for " Ir? P;Azevedo "
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Características produtivas e qualitativas de ramas e raízes de batata-doce
Andrade Júnior, Valter C de;Viana, Daniel José S;Pinto, Nísia AVD;Ribeiro, Karina G;Pereira, Rosana Cristina;Neiva, IrP;Azevedo, Alcinei M;Andrade, Paulo César de R;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000400004
Abstract: sweet potato is a versatile vegetable which can be used both as human and animal food. the relatively easy and inexpensive cultivation of this vegetable associated with the crop adaptability to several conditions of soil and climate enable the production of sweet potato by family farmers. the objective of this research was to evaluate production of fresh and dry mass of vines for animal nutrition and productivity and storage quality of roots for human food of sweet potato clones. the experimental design was randomized blocks, containing twelve clones and four replications. sweet potato clones from ufvjm germplasm bank were tested along with the control cultivars brazlandia rosada and brazlandia roxa, harvested six months after planting date. we evaluated the productivity of fresh and dry matter of vines and yield and quality of roots. the best clone was bd-45 with a high yield of fresh mass, dry matter and total and commercial roots, with values of 19.7; 3.3; 32.9 and 29.5 t ha-1, respectively. most genotypes presented roots near the ideal format for the market and good resistance to soil insects, with values near to grade 2.0. significant differences were observed among genotypes for the content of starch, total and reducing sugars. the genotypes showed similar chemical composition, except for the ash content. clones bd-67 and bd-56 showed higher levels of ash than cambraia, and similar to other clones.
Ecosystem Services in Differently Used Agroecosystems along a Climatic Gradient in Slovakia  [PDF]
Jarmila Makovníková, Boris Pálka, Milo? ?iráň, Beáta Hou?ková, Radoslava Kanianska, Miriam Kizeková
Open Journal of Ecology (OJE) , 2018, DOI: 10.4236/oje.2018.812037
For analysis and evaluation of potential of agroecosystem (arable land and grassland) services (provisioning, regulating and cultural) in Slovakia we have created a mapping unit combining these input layers: slope topography, soil texture and landuse in four climatic regions. Evaluated potential of agroecosystem services was categorised into five categories (very low, low, medium, high and very high). Our results show that climate has the most significant impact on agroecosystem services. Warm, dry lowland region has a higher potential of provisioning services, regulation of water regime, filtration of pollutants and control of soil erosion in comparison to moderately warm and cold regions. In moderate cold region, more than 90% of the total area of arable land has low potential of water regime regulation and cleaning potential (immobilization of risk elements). In the moderate warm climatic region, there is a high share of categories of low and moderate potential of provisioning services and low and moderate potential of water regime regulation. Majority of the total area of warm climatic region belongs to the categories of moderate to high potential of provisioning services and high potential of regulation of water regime. In this climatic zone low potential categories of risk elements immobilization are present in more than 65% of the arable land total area. On the other hand, in very warm climatic zone, more than 89% of the total area of arable land belongs to the category with a very high cleaning (buffering) potential. Potential of natural conditions for recreation is higher only in moderate cold and moderate warm climatic zones with a higher proportion of area of grassland agroecosystems and protected areas NATURA 2000. Moreover, the methodology developed in this paper is replicable and could be applied by planners in the case that they are proficient in geographical information systems.
Continuous Symmetric Perturbations of Planar Power Law Forces
C. Azevedo,P. Ontaneda
Mathematics , 2003,
Abstract: We show the existence of periodic solutions for continuous symmetric perturbations of certain planar power law problems.
On the Existence of Periodic Orbits for the Fixed Homogeneous Circle Problem
C. Azevedo,P. Ontaneda
Mathematics , 2005,
Abstract: We prove the existence of some types of periodic orbits for a particle moving in Euclidean three-space under the influence of the gravitational force induced by a fixed homogeneous circle. These types include periodic orbits very far and very near the homogeneous circle, as well as eight and spiral periodic orbits.
A New Biological Strategy for Drug Delivery: Eucaryotic Cell-Derived Nanovesicles  [PDF]
Irène Tatischeff, Annette Alfsen
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2011, DOI: 10.4236/jbnb.2011.225060
Abstract: An efficient drug delivery is the prerequisite of the successful chemotherapeutic treatments of many human diseases. Despite a great number of approaches, the improvement of drug cell internalization remains an actual research challenge. We propose a new biological delivery system based on the extracellular vesicles released by a non-pathological eukaryotic microorganism, Dictyostelium discoideum. After a summary of the main characteristics of these extracellular vesicles, including of their lipid bilayer that appears as a good candidate for initiating membrane fusion, followed by delivery of their encapsulated drug, the capacity of these vesicles to convey drugs into human cells was demonstrated in vitro on two tumor cell lines, resistant leukaemia K562r and cervix carcinoma HeLa cells. A comparison with other extracellular vesicles, like exosomes or bacteria-derived particles, stresses the unique properties of Dictyostelium extracellular nanovesicles for drug delivery.
The Lipid Bilayer of Biological Vesicles: A Liquid-Crystalline Material as Nanovehicles of Information  [PDF]
Annette Alfsen, Irène Tatischeff
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2014, DOI: 10.4236/jbnb.2014.52013

The biological intracellular vesicles, formed from the cell membrane or from different cell organelles, play a main role in the intracellular transport, transfer and exchange of molecules and information. Extracellular vesicles are also detected in organisms belonging to any of the three main branches of evolution, Archaea, Bacteria and Eukarya. There is an increasing consensus that these vesicles are important mediators of intercellular communication. All the intracellular and extracellular vesicles present a characteristic lipid composition and organization that governs their formation, targeting and function. This paper gives an overview of the lipid chemical and physical structure, strongly related to their biological function. The properties and role of the different types of lipids from membranes and vesicles are described. Then, their physical structure is shown as self-associated in a bilayer and organized as a lyotropic liquid crystal. The present paper underlies the structural similarity between these biological vesicles and a new synthetic material, theliquid crystalline fullerodendrimers” obtained from the biological model. It is composed of a basket of carbon associated with a liquid crystalline material and has been shown to exhibit highly efficient properties of information transfer. Our observation stresses the essential role of the liquid crystalline structure of lipids in their function as biological nanovehicles of information. The comparison with the synthetic material contributes to a better understanding of the role of lipids for cell communication in living organisms.

Refractive error blindness in Yenagoa, Bayelsa state, Nigeria: a hospital based study
IR Azonobi
Benin Journal of Postgraduate Medicine , 2010,
Abstract: Background: Despite the priority attention giving to refractive error in vision 2020 programme, blindness due to uncorrected refractive error is relatively unexplored. The aim of this study is to determine the prevalence and causes of refractive error blindness in Yenagoa. Method: All consecutive patients presenting to our eye clinic that were diagnosed to have refractive error over a one year period was studied. They underwent a full ocular examination including anterior and posterior segment examination, objective and subjective refraction. Objective refraction was done using a Carl Zeiss 599R autorefractometer. Information obtained included their age, sex, occupation, presenting visual acuity, history of couching and that of cataract surgery without an implant. Statistical analysis was done manually using a scientific calculator. Results: 1168 patients was seen during the study period and 135 persons had refractive error. Of the number with refractive error, 63 were males while 72 were females (M:F=1:1.4). Their age ranged from 6 to 83 years with a mean of 35.7 years (SD±4.102). The prevalence of refractive error blindness was 0.68 %. High myopia accounted for 75% of the blindness while high hyperopia and aphakia accounted for 12.5% each respectively. The prevalence of low vision due to refractive error was 2.5%. Myopia was responsible for half of the cases of low vision while hyperopia and astigmatism accounted for 30% and 16% respectively. Aphakia was responsible for 3.3% of low vision seen. Conclusion: Uncorrected refractive error is potentially blinding with a prevalence of 0.68% in this population, myopia being responsible for majority of cases. Health education is needed to create awareness on the availability of refractive error services in this population in order to stem the tide of needless blindness.
Monocular blindness in Bayelsa state of Nigeria
IR Azonobi
Pan African Medical Journal , 2010,
Abstract: Background: Monocular blindness has not received much attention in developing countries despite its numerous disadvantages. A monocularly blind person is at high risk of being bilaterally blind. The objective of this study was to determine the causes of monocular blindness in the study population and to suggest strategies for prevention. Methods: A prospective study was conducted among new consecutive patients that presented to our clinic over a period of one year and those with visual acuity (VA) less than 3/60 in the worse eye after optical correction or with pin hole as necessary were studied. Visual acuity was determined using a snellen acuity chart, followed by a full ocular examination including anterior and posterior segment examination. Objective refraction was carried out followed by a subjective refraction. Other information obtained from the patients included their age, sex and occupation. All collected data was documented in a questionnaire designed for this study. Data were recorded and analysed using a scientific calculator. Results: Over a one year period, 149 patients presented with monocular blindness. There were 92 males and 57 females (Male to female ratio of 1.6).Their ages ranged from 3 to 84 years (mean age of 44.4 years). The majority of the patients were public servants and students constituting 28.8% and 20.1 % or patients respectively. The two leading causes of monocular blindness were cataract and uveitis constituting 41.5% and 12.7% of monocular blindness respectively. Other causes in decreasing order includes glaucoma(10.7%), cornea diseases(8.7%), trauma(8.0%), phtisis bulbi (5.4%), aphakia (4.0%), maculopathy (3.4%), optic atrophy (2.7%), ophthalmitis (1.3%), retinitis pigmentosa and retinal detachment (each 0.7%). The majority of the blindness (96.4 %) was avoidable. Conclusion: Cataract was the leading cause of monocular blindness. Uveitis was found to be an important cause of monocular blindness in this population. While efforts need to be made to increase the uptake of cataract surgery in this population, the aetiology and risk factors of uveitis need to be explored. Overall, more emphasis should be placed on health education as the majority of monocular blindness in this population is avoidable.
Ar iv Belgeleri I nda Kuba'da Ermeni Zulmü: 1905-1920 (Persecution of Armenians in the Light of Kuba Document Library: 1905-1920)
Be?ir Mustafayev
Karadeniz Ara?t?rmalar? , 2010,
Abstract: XIX. and the end of the XX century, especially in North Azerbaijan, Armenia and Eastern Anatolia, the territory of today's Turks suffered a genocide and atrocities are being semesters. Unfortunately, today in Europe and the former Soviet historiography on these atrocities and genocide has ever considered. Born in Kuba, one of the first Armenian persecution (Guba-Quba) in 1905 were made in the province. The border to Russian, this region was of strategic importance to the holding position. In this study, located in the north of Azerbaijan in Turkey against the Kuba Region will focus on the atrocities. During these years, this land of the Armenians and their supporters in their activities based on archival documents will consider weighted. All the activities of the Armenian Dashnak power mainly in Russian, indicating the support of outside forces has a large number of archival documents. Azerbaijan of the National State Archives (ARDA-ARMDA-ARDTA), Azerbaijan Political Parties and Movements assembly Library (ARSP HA), Russian Federation State Historical Library (RFDTA), Literature and arts Library, National publications, the Academy of Sciences Institute of History Library , History Faculty Library, Kuba City Library Fond Jewish institutions in areas such as the vast majority of documents in Russian, Armenian gangs only within the borders of Ottoman Anatolia to Turkey, but also in the Kuba region in the Azeri atrocities in Turkey they are applied.
The Role of Azerbaijan Oil in Armenian Activities in the First Republic Era (1918-1920)
Be?ir Mustafayev
Igdir University Journal of Social Sciences , 2012,
Abstract: Today, energy constitutes the backbone of economy, and as for oil, it constitutes the backbone of the energy as well. Oil, which shows its effect all the time for human life and for international affairs in an unquestionable way, has become the most suitable substance that can be turned into power and money interms of political and military aims. The struggles for oil, clearly reveals the truth of this assertion. So, the Armenian settlement policy, carried out deliberately by the Russians with the support of foreign powers from the very outset of 1918, has resulted in the occupation of Azerbaijan territory which occured rather as a consequence of oil-centered political and economic accounts. In this article, it is discussed the division of Azerbaijan territory and its subsequent occupation on account of struggle for oil primarily by Russia and other imperialist quarters and their support to Armenians for this cause in the era of first established Muslim-Turkish Azerbaijan Republic.
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