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Infertilidad y endometriosis
Duly Torres-Cepeda,Oneida Delgado-Delgado,María Colmenares-Vega,Doris Sounghi-Sinhi
Revista de Obstetricia y Ginecología de Venezuela , 2007,
Discretization and Interaction of Fields via the Classical Kaluza-Klein Theory  [PDF]
Doris LaChance, Claude Gauthier
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.412199

We show how the metric of a five-dimensional hyperspace-time can be used to model the quantum nature of electromagnetic interactions. The space-time neighborhood of the point where such an interaction takes place bends according to the curl and the derivative of the local electromagnetic four-potential, both calculated in the direction of the latter. In this geometric setting, the presence of a non-gravitational field is needed to induce the discretization of any gravitational field. We also exploit two variants of the classical Kaluza-Klein five-dimensional theory to obtain coupled generalizations of Einsteins and Maxwells equations. The first variant involves an unspecified scalar field that may be related to the inflaton. The equations of the second variant show a direct interdependency of gravitation and electromagnetism that would emerge or be activated through the production of electromagnetic waves.

Online Advertising and Customer Satisfaction of E-Tailing Firms in Nigeria  [PDF]
N. Gladson Nwokah, Doris Ngirika
Intelligent Information Management (IIM) , 2018, DOI: 10.4236/iim.2018.101002
Abstract: This study examined the Impact of Online Advertising on Customers Satisfaction of E-tailing Firms in Nigeria. A survey research design was adopted. The source of data used in this study was mainly primary data from the issuance of questionnaire and secondary data from the review of relevant literature bothering on both variables which formed the basis for the argument. Out of a total of three hundred and eighty four (384) copies of questionnaire distributed, two hundred and eighty five (285) copies was used for analysis and analyzed using Spearman’s Rank Order Correlation Coefficient with the help of Statistical Package for Social Sciences (SPSS). The findings of the study reveal amongst others that there is a positive and strong relationship between online advertising and customers’ satisfaction; and online advertising significantly affects customer satisfaction. The study concludes that online advertising influenced satisfaction of the customers to a strong extent. However, online advertising is a key determinant of customer satisfaction as it is considered as a point of interaction between customers and the company from which they buy their products. A heuristic model was proposed to show our contribution to knowledge that the relationship between e-mail marketing and measures of customer satisfaction is very strong and is moderate on all other tested hypotheses. And the study recommends that advertising managers of e-tailing firms must develop and formulate e-mail marketing programs that will satisfy the needs of consumers and advert should be placed on stations and places where consumers can easily identify with them and make a purchase. Suggestions for further studies were outlined.
Similar rates of protein adaptation in Drosophila miranda and D. melanogaster, two species with different current effective population sizes
Doris Bachtrog
BMC Evolutionary Biology , 2008, DOI: 10.1186/1471-2148-8-334
Abstract: Here I study patterns of polymorphism and divergence at 91 X-linked loci in D. miranda, a species with a roughly 5-fold smaller effective population size than D. melanogaster. Surprisingly, I find a similar fraction of amino-acid mutations being driven to fixation by positive selection in D. miranda and D. melanogaster. Genes with higher rates of amino-acid evolution show lower levels of neutral diversity, a pattern predicted by recurrent adaptive protein evolution. I fit a hitchhiking model to patterns of polymorphism in D. miranda and D. melanogaster and estimate an order of magnitude higher selection coefficients for beneficial mutations in D. miranda.This analysis suggests that effective population size may not be a major determinant in rates of protein adaptation. Instead, adaptation may not be mutation-limited, or the distribution of fitness effects for beneficial mutations might differ vastly between different species or populations. Alternative explanation such as biases in estimating the fraction of beneficial mutations or slightly deleterious mutation models are also discussed.Researchers have made considerable progress in recent years to quantify rates of adaptive evolution in the genome using population variability data [1-6]. Many studies aimed at detecting adaptive evolution have applied the McDonald-Kreitman (MK) test [7] or modifications of it, which contrasts the number of polymorphisms within a species to the number of substitutions between species at two classes of sites, a putatively neutral and a putatively selected class. In protein-coding sequences these classes are usually synonymous and replacement sites [7].Several members in the Drosophila melanogaster species group show high rates of adaptive amino-acid evolution. Using the MK test and its extensions, about half (and up to 95%) of all amino-acid mutations fixed between species are inferred to be driven by positive selection [1-4]. Some uncertainty in estimates of α, the fraction of amino-
Skp2 and Skp2B team up against Rb and p53
Doris Germain
Cell Division , 2011, DOI: 10.1186/1747-1028-6-1
Abstract: The retinoblastoma (Rb) and the p53 pathways are two major mechanisms of tumor suppression. Disruption of these pathways is observed in most cancers. This review focuses on the description of two mechanisms by which both Rb and p53 pathways are disrupted simultaneously. First, the loss of the well known p16INK4a/p19ARF locus and second, the less well known amplification of the Skp2/Skp2B locus.The remarkable genetic organization of some loci suggests that evolution has selected mechanisms to maximize their biological impact. One example of such clever organization is the p16Ink4a/p19Arf locus. By using two distinct promoters, this locus allows the expression of two different proteins using overlapping genetic material (reviewed in [1]; the p16 protein, a cyclin-dependent kinase (cdk) inhibitor and ARF, an indirect regulator of the tumor suppressor gene p53.The cyclin dependent kinases (cdk) are a family of protein serine/threonine kinases, which control cell cycle progression through association with their regulatory subunits, known as cyclins. Cyclins are classified into a large number of subtypes including the D, E, A and B-type cyclins. Humans encode three D-type cyclins, cyclin D1, cyclin D2 and cyclin D3. D-type cyclins associate with cdk4 and 6 to promote the phosphorylation of the Retinoblastoma (Rb) protein (for review, [2]). Rb forms a complex with the E2F family of transcription factors and this represses their activity. Hyperphosphorylation of Rb results in the release of E2F, which then activates transcription of genes required for DNA replication and entry into S phase [3]. One of the early targets of E2F mediated transcription is cyclin E that, together with cdk2, acts to maintain Rb phosphorylation.Cyclin-cdk complexes are themselves regulated by two families of cdk inhibitors including p27 of the p21 family, which inhibits cyclin E-cdk2 complexes [4], and p16 of the INK4 family, which inhibits cyclin D-cdk4/6 complexes [5]. Functional disruption of t
Caracteriza??o morfológica das sementes e plantulas de seis espécies invasoras do gênero Solanum L
Groth, Doris;
Acta Botanica Brasilica , 1989, DOI: 10.1590/S0102-33061989000100002
Abstract: morphological caracterization of the seeds and seedlings of six weed especies of the genus solanum l. the seeds of the genus solanum are very similar, however, the association of their external characteristics with the anatomical features, such as hilum shape, the texture and the type of the seed coat sculptures, as well as the curved (circulated or coiled) shape of the embryo, are parameters of great importance in the taxonomical identification at the species level. it is are presented the morphological descriptions of the genus solanum and a more detailed description of each studied species in terms of seed and seedling structures, including illustrations and taxonomical keys for the identification of solanum aculeatissimum jacq., s. americanum mill., s. ciliatum lam., s. sisymbriifolium lam., s. sordidum sendt. e s. viarum dunal. there are also indications of the common names, the type of reproduction and dispersion, the crops in which the species is considered as a weed and the agricultural seeds in which it is found as a weed seed.
Exploring Academic Writing and Voice in ESL Writing
íkala, Revista de Lenguaje y Cultura , 2009,
Abstract: this literature review explores two basic questions: first, why have english as a second language (esl)/english as a foreign language (efl) academic writing courses not been able to signi?cantly help esl/efl students meet the academic writing demands of their university courses? second, how can esl/efl writing instructors better help these students succeed in their undergraduate courses? to respond to these questions, the author reviews how notions of academic writing, text, and voice have changed over time, and how these changes have in?uenced (esl) and (efl) writing approaches and methodologies. the author also presents some of the critiques that scholars have posed regarding each of these notions, approaches and methodologies, and draws some conclusions based on these critiques.
A subjetividade hoje: os paradoxos da servid?o voluntária
Rinaldi, Doris;
ágora: Estudos em Teoria Psicanalítica , 2001, DOI: 10.1590/S1516-14982001000100001
Abstract: according to the "voluntary servitude" concept, elaborated by etienne de la boétie in the 16th century, this paper intends to examine subjectivity nowadays. the "voluntary servitude" concept, and the paradoxes it implies, has turned out to be quite productive and up to date in order to think of the live movement of both subject alienation and separation, particularly in the brazilian society which has just turned five hundred years old.
Cultivos Tropicales , 2010,
Abstract: sugarcane production in cuba has undergone considerable damages from the financial and climatologic point of view; thus, it is necessary to establish sustainable production systems promoting to increase agricultural yields and protect the environment. among these practices, the use of bio-fertilizers constitutes an alternative to improve current productions with the lowest environmental damage. in our country, the application of plant growth promoting bacteria (pgpb) to sugarcane has been studied since 1990′s; however, it has not been potentially used as a nutritional alternative of crop culture. this work was aimed to emphasize the significance of including pgpb as a bio-fertilizer to a sustainable sugarcane production, besides showing the most significant results and performing a prospect analysis of its use in sugarcane production.
Developing Academic Literacy and Voice: Challenges Faced by A Mature esl Student and Her Instructors
Profile Issues in Teachers` Professional Development , 2010,
Abstract: drawing on critical, socio-cultural and sociolinguistic theories of writing, text and voice, this ethnographic study examines the challenges that a mature esl student and her instructors in a university course on spanish language media face as they co-construct a common understanding of academic literacy and voice in an undergraduate general studies program offered by a university in western massachusetts. intertextual analysis of the data suggests that traditional product-based approaches to helping students develop academic literacy might not be very effective. however, to be able to take a different approach, such as the one suggested by genre scholars, both faculty teaching content subjects and writing tutors would need appropriate training.
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