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Search Results: 1 - 10 of 14445 matches for " Andrea Saba "
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Dependencies and Simultaneity in Membrane Systems
G. Michele Pinna,Andrea Saba
Electronic Proceedings in Theoretical Computer Science , 2009, DOI: 10.4204/eptcs.11.10
Abstract: Membrane system computations proceed in a synchronous fashion: at each step all the applicable rules are actually applied. Hence each step depends on the previous one. This coarse view can be refined by looking at the dependencies among rule occurrences, by recording, for an object, which was the a rule that produced it and subsequently (in a later step), which was the a rule that consumed it. In this paper we propose a way to look also at the other main ingredient in membrane system computations, namely the simultaneity in the rule applications. This is achieved using zero-safe nets that allows to synchronize transitions, i.e., rule occurrences. Zero-safe nets can be unfolded into occurrence nets in a classical way, and to this unfolding an event structure can be associated. The capability of capturing simultaneity of zero-safe nets is transferred on the level of event structure by adding a way to express which events occur simultaneously.
Listeria monocytogenes meningoencephalitis: molecular methods for diagnosis and for monitoring the response to chemotherapy
Andrea Piana,Riccardo Are,Marcella Orrù,Franca Saba
Italian Journal of Public Health , 2005, DOI: 10.2427/5994
Abstract: Background. Listeria monocytogenes is one of the most important human foodborne pathogens; it may be responsible for several disorders, like meningoencephalitis. Listerial isolation in cerebrospinal fluid (CSF) is often difficult using microbiologic traditional assays. The aim of this study is to evaluate the reliability of molecular techniques as an alternative tool in order to identify Listeria monocytogenes meningitis and in particular, to evaluate a real-time PCR and a conventional PCR for the target hlyA gene. Methods. In 2000-2004, 145 patients, without T-cell immunodeficiency, affected by meningoencephalitis of unknown origin were admitted to the Infectious Diseases Institute of Sassari, Italy; a lumbar puncture was performed at the time of hospital admission. Two different PCR techniques, i.e. RT-PCR and a conventional PCR, were performed in order to detect CNS listerial infection, in conjunction with traditional microbiologic assays. Results. We identified fourteen patients affected by listerial meningitis using RT-PCR and conventional PCR. All but one of the CSF cultures were negative for L. monocytogenes. Molecular techniques were performed on the CSF samples collected during follow-up revealing that signal intensity decreased by 40%, 80% and 100% at day 15, 30 and 55 respectively, from the start of antibiotic treatment. Conclusions. Considering the seriousness of CNS involvement caused by L. monocytogenes infection, prompt diagnosis is necessary in order to rapidly start specific treatment. Conventional PCR and RT-PCR are rapid assays for L. monocytogenes diagnosis and they might be useful for monitoring the efficacy of antibiotic therapy
Flood Hazard Mapping of Lower Indus Basin Using Multi-Criteria Analysis  [PDF]
Saba Zehra, Sheeba Afsar
Journal of Geoscience and Environment Protection (GEP) , 2016, DOI: 10.4236/gep.2016.44008
Abstract: Flooding has been one of the recurring occurred natural disasters that induce detrimental impacts on humans, property and environment. Frequent floods is a severe issue and a complex natural phenomenon in Pakistan with respect to population affected, environmental degradations, and socio-economic and property damages. The Super Flood, which hit Sindh in 2010, has turned out to be a wakeup call and has underlined the overwhelming challenge of natural calamities, as 2010 flood and the preceding flood in 2011 caused a huge loss to life, property and land use. These floods resulted in disruption of power, telecommunication, and water utilities in many districts of Pakistan, including 22 districts of Sindh. These floods call for risk assessment and hazard mapping of Lower Indus Basin flowing in the Sindh Province as such areas were also inundated in 2010 flood, which were not flooded in the past in this manner. This primary focus of this paper is the use of Multi-criteria Evaluation (MCE) methods in integration with the Geographical Information System (GIS) for the analysis of areas prone to flood. This research demonstrated how GIS tools can be used to produce map of flood vulnerable areas using MCE techniques. Slope, Aspect, Curvature, Soil, and Distance from Drainage, Land use, Precipitation, Flow Direction, and Flow Accumulation are taken as the causative factors for flooding in Lower Indus Basin. Analytical Hierarchy Process-AHP was used for the calculation of weights of all these factors. Finally, a flood hazard Map of Lower Indus Basin was generated which delineates the flood prone areas in the Sindh province along Indus River Basin that could be inundated by potential flooding in future. It is aimed that flood hazard mapping and risk assessment using open source geographic information system can serve as a handy tool for the development of land-use strategies so as to decrease the impact from flooding.
Determination Cadmium and Lead Pollution Resources of Ardabil Plain Underground Waters  [PDF]
Saba Hajjabbari, Ebrahim Fataei
Open Journal of Ecology (OJE) , 2016, DOI: 10.4236/oje.2016.69053
Abstract: Underground water is among the most important sources of drinking water. The aim of this study was to determine the concentrations of heavy metals (cadmium, lead) in providing plain of Ardabil in 2015. This study was cross-sectional, drinking water samples from 100 wells were prepared according to standard procedures. The dimensions of 350 × 350 meter grid station via a station in the network were determined by atomic absorption spectrometry AAS analysis of samples. The data obtained were analyzed using SPSS software. The average concentrations of lead, cadmium in groundwater wells in the area were also studied. The mean concentrations measured in the majority of groundwater wells in the plain of Ardabil lower than the allowed amount were designated according to a national standard.
Chaos Behavior and Estimation of the Unknown Parameters of Stochastic Lattice Gas for Prey-Predator Model with Pair-Approximation  [PDF]
Saba Mohammed Alwan
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.715148
Abstract: In this paper, the problem of chaos, stability and estimation of unknown parameters of the stochastic lattice gas for prey-predator model with pair-approximation is studied. The result shows that this dynamical system exhibits an oscillatory behavior of the population densities of prey and predator. Using Liapunov stability technique, the estimators of the unknown probabilities are derived, and also the updating rules for stability around its steady states are derived. Furthermore the feedback control law has been as non-linear functions of the population densities. Numerical simulation study is presented graphically.
Peripartum Hysterectomy in Misan Province during 2014-2016  [PDF]
Saba J. Al Heshemi
Open Journal of Obstetrics and Gynecology (OJOG) , 2017, DOI: 10.4236/ojog.2017.72028
Abstract: Background: Peripartum hysterectomy is the procedure of removing the uterus after vaginal delivery or cesarean birth; it remains a life-saving procedure in cases of severe uterine hemorrhage. Objective: To know the incidence of peripartum hysterectomy in Misan province, what is the main cause of this procedure, and if there is any change in the incidence of this procedure during a 3 year study period. Method: A descriptive cross sectional study was done in Misan province for all cases of peripartum hysterectomy during the period from 2014-2016. All information regarding present pregnancy, previous obstetric history, the cause of peripartum hysterectomy, any complications & infant outcome, were taken from the case sheet & from the patients themselves. 50 patients were enrolled in this study, and only 30 patients needed peripartum hysterectomy and 20 patients’ uterus were saved by repair surgery. Results: During the study period of 3 years, there was 72,720 deliveries, and during that time 30 peripartum hysterectomies were carried out of the 50 cases studied, which gave an incidence of 0.4/1000 deliveries. The patients were diagnosed as: rupture uterus in 30 (60%) cases, adherent placenta in 14 (28%) & 6 (12%) cases had atonic uterus. The major postoperative complication was anemia which complicated 23 (46%) cases, & then bladder injury 5 (10%). Admission to ICU was needed for 24 (48%) cases. There were 32 (64%) cases needed ≥4 units of blood transfusion. There were 38 (76%) cases stayed in hospital for ≥4 days. The most common cause for peripartum hysterectomy was for adherent placenta (28%) & rupture uterus (20%). Conclusion: The incidence of peripartum hysterectomy was 0.4/1000 (0.04%) deliveries. The most common reason behind peripartum hysterectomy was for adherent placenta and next was for uterine rupture. The rate of this procedure was not changed during the study period.
Students’ and Instructors’ Perceptions of Turnitin: A Plagiarism Deterrent?  [PDF]
Najwa Saba Ayon
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.813141
Abstract: Academicians consider plagiarism a major threat to academia. To combat that threat, a lot of universities, including the researcher’s university, have been using Turnitin. It is believed that this software is likely to deter students’ plagiarism. The aim of this study is, therefore, to investigate1) the impact of Turnitin on students’ plagiarism from the perspectives of both students and instructors in a private Lebanese English-speaking university and 2) the reasons that push students to plagiarize. A concurrent mixed-methods design is employed, and different data collection methods are used. The data are analyzed quantitatively and qualitatively. Findings reveal that although a lot of the participants perceive Turnitin as a good deterrent to plagiarism, it did not completely inhibit it. The findings also reveal that not all instructors were committed enough to use Turnitin in their courses. Some of the reasons for plagiarism that the participants named are lack of citation skills, laziness, and indifference among students to abide by ethical writing norms.Besides reinforcing the use of Turnitin among all instructors, the researcher recommends that students’ writing and citation skills be improved and that students be helped to become more ethical writers.
An Empirical Approach to Get the Vitality of a Genotype to Water Stress Tolerance in Yield and Yield Contributing Traits  [PDF]
Ijaz Rasool Noorka, Saba Tabasum
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.45123

Conventional methods of plant breeding and agronomic practices remained a successful tool to maintain the pace of food production for centuries but due to changing climatic conditions and the challenges of 21st century like population growth, pollution, declining biodiversity and food security have shaken the previous policies. This situation compelled the agriculturist towards the judicious management of natural resources to combat the poverty, disasters and increased food demands. The present study was initiated to check wheat varieties in two water provision conditions. The results revealed that environmental stresses played negative role by minimizing the yield and yield contributing traits. However the severity of water stress was depleted by some promising genotypes by showing minimum hazard effects and by having capability to contribute to conserving biodiversity, ensuring sustainability, combating food insecurity and increasing economic benefits. The minimum effect of moisture stress on grain yield was shown by genotypes C-518 (12.97%) while the genotype Shakar, Pari-73 and Uqab-2000 showed maximum decline percentage. The global warming and population explosion will further induce commodity shortage and law and order situation in the world. The prevailing International tension can be cooled down by the provision of marshal aids by the developed countries to the effected or threatened countries.

Range Management Affects Native Ungulate Populations in Península Valdés, a World Natural Heritage
Marcela J. Nabte, Andrea I. Marino, María Victoria Rodríguez, Adrián Monjeau, Sergio L. Saba
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0055655
Abstract: Sheep rearing is the main productive activity in Patagonian rangelands, where guanacos are the only native ungulate. Ranchers perceive a decrease in range carrying capacity as guanaco numbers increase, therefore guanaco conservation within private lands becomes a considerable challenge. This issue is particularly evident in the World Natural Heritage Península Valdés (PV), where there is a need to harmonize livestock production and biodiversity conservation. While sheep rearing prevails as the primary land use in the area, some ecotourism initiatives have been implemented to complement livestock production. In order to study how land use affected guanaco distribution, we characterized PV's ranches in terms of land subdivision, primary productivity, stocking-rate and management type, and assess how these variables affected guanaco encounter rates. Smaller ranches were composed of smaller paddocks (mean size 4.8 km2), which showed higher values of the remote-sensing derived Enhance Vegetation Index (EVI) (mean 0.14) and held higher sheep densities (mean 108.0 sheep/km2), while larger management units (mean size 23.8 km2), showed lower EVI values (mean 0.12) and lower stocking-rates (mean 36.7 sheep/km2). This pattern suggests that primary productivity has been a decisive factor to determine the minimal paddock size set by ranchers in PV, apparently precluding excessive land-subdivision in less productive areas. Guanaco encounter rate, expressed as number of guanacos per travelled kilometre, was inversely related to EVI and stocking-rate. However, land subdivision was the better predictor of guanaco encounter-rate within only sheep ranches, finding more guanacos per kilometre as paddock size increased. In contrast, in ranches where ecotourism was implemented as a complementary activity, guanaco encounter-rates were greater, regardless of paddock size. Our results suggest that the implementation of an additional activity by which landowners derive benefits from wildlife has prompted a beneficial outcome for guanacos, presumably through a decrease in harassment intensity. Finally, we propose possible mechanisms by which land subdivision may affect guanaco distribution and potential alternatives for the inclusion of wildlife conservation in a context of extensive livestock production.
Teoria feminista, agência e sujeito liberatório: algumas reflex?es sobre o revivalismo islamico no Egipto
Etnográfica , 2006,
Abstract: this article argues for uncoupling the notion of agency from that of resistance as a necessary step in thinking about forms of desire and politics that do not accord with norms of secular-liberal feminism. through an examination of the practices of women?s piety movement, part of the larger islamic revival in egypt, this article suggests that agency is better understood through the paradox of subjectivation: a process that not only secures the subjects subordination to relations of power but is also the means by which she becomes a self-conscious identity and agent. viewed in this way, agency is not simply a synonym for resistance to relations of domination, but a capacity for action that specific relations of subordination enable and create.
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