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Search Results: 1 - 10 of 713633 matches for " M.A "
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Measurement of Different Types of Potato Chips by Inductively Coupled Plasma-Optical Emission Spectrometer  [PDF]
AL-rajhi, M.A.
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.42007

Potato chips are considered as one of the most popular and preferable children’s foods in Saudi Arabia. The aim of this study was to examine the concentration of 12 chemical elements (i.e. Cd, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Zn, As, Se and Al) in different types of potato chips. Samples were analyzed using an Inductively Coupled Plasma-Optical Emission Spectrometer (ICP-OES). The average concentrations of analyzed elements in all potato chips were examined and compared with the recommendations of international organizations concerned with food safety. From the human health point of view, this investigation showed that there was no possible health risk to consumers due to the intake of potato chips.

Levels of C-reactive protein in serum samples from healthy children and adults in S?o Paulo, Brazil
Ribeiro, M.A.;
Brazilian Journal of Medical and Biological Research , 1997, DOI: 10.1590/S0100-879X1997000900002
Abstract: c-reactive protein (crp) was measured by elisa in the sera of 165 healthy blood donors and 125 normal children 1 to 14 years old. the serum levels of blood donors ranged from 0.05 to 57.6 mg/l with median and mean values of 1.8 mg/l and 4.86 mg/l, respectively. crp levels ranged from 0.02 to 14.4 mg/l in the children's sera, the median being 0.45 mg/l and the mean 1.65 mg/l. no individual lacking crp was detected. the high crp levels observed in the present study suggest that the population of the state of s?o paulo may usually be exposed to subacute infections and/or inflammation without presenting clinical symptoms
The extracellular matrix provides directional cues for neuronal migration during cerebellar development
Porcionatto, M.A.;
Brazilian Journal of Medical and Biological Research , 2006, DOI: 10.1590/S0100-879X2006000300001
Abstract: normal central nervous system development relies on accurate intrinsic cellular programs as well as on extrinsic informative cues provided by extracellular molecules. migration of neuronal progenitors from defined proliferative zones to their final location is a key event during embryonic and postnatal development. extracellular matrix components play important roles in these processes, and interactions between neurons and extracellular matrix are fundamental for the normal development of the central nervous system. guidance cues are provided by extracellular factors that orient neuronal migration. during cerebellar development, the extracellular matrix molecules laminin and fibronectin give support to neuronal precursor migration, while other molecules such as reelin, tenascin, and netrin orient their migration. reelin and tenascin are extracellular matrix components that attract or repel neuronal precursors and axons during development through interaction with membrane receptors, and netrin associates with laminin and heparan sulfate proteoglycans, and binds to the extracellular matrix receptor integrins present on the neuronal surface. altogether, the dynamic changes in the composition and distribution of extracellular matrix components provide external cues that direct neurons leaving their birthplaces to reach their correct final location. understanding the molecular mechanisms that orient neurons to reach precisely their final location during development is fundamental to understand how neuronal misplacement leads to neurological diseases and eventually to find ways to treat them.
Genetic alterations in head and neck squamous cell carcinomas
Nagai, M.A.;
Brazilian Journal of Medical and Biological Research , 1999, DOI: 10.1590/S0100-879X1999000700015
Abstract: the genetic alterations observed in head and neck cancer are mainly due to oncogene activation (gain of function mutations) and tumor suppressor gene inactivation (loss of function mutations), leading to deregulation of cell proliferation and death. these genetic alterations include gene amplification and overexpression of oncogenes such as myc, erbb-2, egfr and cyclind1 and mutations, deletions and hypermethylation leading to p16 and tp53 tumor suppressor gene inactivation. in addition, loss of heterozygosity in several chromosomal regions is frequently observed, suggesting that other tumor suppressor genes not yet identified could be involved in the tumorigenic process of head and neck cancers. the exact temporal sequence of the genetic alterations during head and neck squamous cell carcinoma (hnscc) development and progression has not yet been defined and their diagnostic or prognostic significance is controversial. advances in the understanding of the molecular basis of head and neck cancer should help in the identification of new markers that could be used for the diagnosis, prognosis and treatment of the disease.
El papel de la medicina forense en el contexto del trabajo humanitario
Cuadernos de Medicina Forense , 2010, DOI: 10.4321/S1135-76062010000100005
Abstract: today the forensic medicine has broader action fields including the humanitarian activities. the geneva conventions and additional protocols have clear rules about the management of dead bodies and the responsibility of many authorities or armed groups in conflict in order to identify those bodies and to deal with them in such manner that facilitate late recovery and to bring them back to their relatives. the international committee of the red cross has been the pioneer organization in those tasks, also united nations and interpol, among other public and private organizations and ngos, are applying protocols and guidelines to jobs in the humanitarian context and prevention of violations of the international humanitarian law. the use of forensic medicine around the world has been and will continue being an important component of humanitarian missions.
Temperature dependence of impurity levels in bulk semiconductors
Amato, M.A.;
Revista Brasileira de Ensino de Física , 2006, DOI: 10.1590/S0102-47442006000200010
Abstract: the temperature dependence of impurity levels in semiconductors is a very interesting problem in the domain of deep levels impurities. its evidence in experimental results is reported by many authors. however, the interpretation on theoretical basis requires sophisticated models. in this paper we propose a very simple model that allows to extract the relevant parameters from the experiment without needing heavy computation.
Propagation of the information in a one-way quantum computer
Avila, M.A.;
Revista mexicana de física E , 2007,
Abstract: both linear momentum and poynting vector associated with the propagation of information in a one-way quantum computer are studied. it is found that, within the so-called mean field theory (mft) approximation the total energy, the linear momentum and the poynting vector associated with the propagation of information are invariant under arbitrary rotations of logical qubits. this means that propagation of the quantum information stored in the entangled state does not depend on the choice of the quantum gates. due that the involved cluster of neighboring particles is large enough, last property satisfies the scalability test. as a consequence, quantum information in the one-way computer is read, written and processed independently of this choice, which suggests a simple hardware for it. when an external magnetic field is switched on, the invariance under arbitrary rotations of the logic qubits of these quantities is lost, that is, the field induces a preferential direction of propagation of the information which at the same time is optimized while more intense be the field.
Differential leaf gas exchange responses to salinity and drought in the mangrove tree Avicecennia germinans (Avicenniaceae)
Revista de Biología Tropical , 2006,
Abstract: leaf gas exchange was assessed in avicennia germinans l. grown under different nacl concentrations (0-40?), after salt-relief, and then during drought. stomatal conductance (gs) and net photosynthetic rate (pn) decreased with increasing nacl concentration, and intrinsic water use efficiency (pn / gs) increased. under desalinization pn / gs declined. thus, gs did not change in plants grown at low nacl concentration (10?), but increased up to 30-32% at higher nacl concentration (20 - 40?). however, pn was only slightly enhanced (10- 15%). under drought, pn decreased by as much as 46% in plants grown at low nacl concentration (10?) and by 22% at high nacl concentration (40?). thus, pn / gs decreased and water use efficiency was lower during drought compared to estimates prior to salt-relief. rev. biol. trop. 54(2): 371-375. epub 2006 jun 01.
Statistical Properties of the Periodogram for Stable Random Field
M.A. GhazalttXtXt
The Open Statistics & Probability Journal , 2009, DOI: 10.2174/1876527000901010011]
Abstract: Let X(t) (t ∈ Z) be a discrete stable random field. The problem of estimating the spectral density field based on X(t) is considered. Moments and the asymptotic moments of the spectral sample, the periodogram, based on X(t) are calculated.
The Challenges for Teacher Education in the Twenty-First Century
M.A. Ayeni
The Social Sciences , 2013,
Abstract: Any discussion on teacher education is as relevant as discussing human life. Education is undoubtedly life. And no educational system can grow above the quality of its teachers. Teachers, therefore, as educational engineers and directors are the soul of any educational system. Thus, the economic, political, social, technological and even the cultural survival of any nation depend on the spirit and the quality of its teachers. This is true, because there is no substitute for teachers that are committed to their job and dedicated to their nation and their pupils. In clear term, the future of any nation rests in the hands of its teachers, for the qualities they posses today will inevitably reflect in the citizens of tomorrow thereby enhancing a virile society not only for self-sufficiency but equally for self-dependency. This study discusses elaborately the challenges for teacher education in the 21st century by examining the concept of education which is the ‘key change’ agent, problems facing teacher education especially in Nigeria, conditions for admitting students into teacher education and the attendant problems, the programme of study, the recognized institutions for teacher education and professionalising teaching for quality education and the anticipated result of such endeavour.
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