McGill University Thèses et mémoires par auteur commençant par W

Somatic tissue is the site of growth and differentiation, and the behaviour of its chromosomes bears directly on the problem of the genetic control of development. Constancy or variability of chromosome number can suggest the importance of whole chromosome complements to developmental stages of the cell and organism. In a diploid organism, polyploidy and haploidy are interesting deviations, but do not present such radical theoretical implications as would a widespread ocourrence of aneuploidy if established.  Lire la suite

Cleft palate is a common congenital anomaly, and it is dealt with by a variety of scientific groups. The medical profession is concerned about cleft palate because it is of sufficiently frequent occurrence to distress many people. Knowledge of the mechanisms and materials involved in palate development might be useful in designing preventive measures for prenatal care. The cleft palate condition is of interest to embryologists because it so often turns up in the list of defects caused by various teratogenic agents, and a better understanding of this defect would help in assessing the specific defects of a teratogenic substance.  Lire la suite

Through the topic of cooperative and collaborative learning, the need for refinement of definitions and expanded methodologies is identified. Past research narrowly focused on only one or two variables of interest, often ignored contextual variables, and has been limited by the use of forced-choice survey data. Research that adopts a social-learning or social-constructivist theoretical framework can help to overcome some of these limitations by considering the context of the learning environment and taking into account individual differences. Some research has moved in this direction, although more is needed that integrates such theories into both research questions and methodology. The current …  Lire la suite

L'enseignement et l'apprentissage par la démarche de l'investigation est une approche socio-constructivist qui est au cœur de la réforme scolaire. Dans les salles de classe où l'apprentissage est basé sur la démarche de l'investigation, les élèves et les enseignants ont des rôles plus variés comparativement aux rôles traditionnels : l'enseignant peut prendre le rôle de l'apprenant tandis que l'élève peut prendre le rôle de l'interrogateur, un rôle qui est habituellement réservé à l'enseignant. Même si la réforme scolaire est basée sur la démarche par l'investigation, la diversification des rôles, ou les différents rôles que l'élève et l'enseignant adoptent lors de …  Lire la suite

Objectifs: Cette revue de la littérature (SR) visait à présenter l’état actuel de la recherche sur l’existence d’un lien entre la discrimination raciale et les problèmes de santé mentale au sein de la population noire nord-américaine, afin d’identifier les lacunes à combler dans la littérature.Méthodes: Une recherche d’études empiriques de 1990 à nos jours a été effectuée via la base de données Web of Science, en suivant la liste de contrôle PRISMA (Preferred Reporting Items For Systematic Reviews and Meta-Analyses).Résultats: La recherche initiale a permis de recenser 898 articles, dont 25 ont été inclus dans la présente revue. Les résultats …  Lire la suite

The problem was to explain effects of mountain terrain, the Canadian Cordillera, on distributions of precipitation and temperature. Techniques from several fields of meteorology were blended with modern data processing in an attempt to overcome the sparseness and non-representativeness of weather observations. Atmospheric characteristics over British Columbia were found to be sharply differentiated by the direction of the flow at the 700 millibar level. Linearized two-dimensional mountain airflow theory was combined with relevant atmospheric characteristics to derive simple models of precipitation distributions over mountain ranges. These models were used to supplement observations to obtain improved charts of precipitation over the …  Lire la suite

The measurement of particle size 1s important industrially. Among other applications may be mentioned its use in the grinding of ores and in the manufacture of Pulp and Paper. Investigations have been in progress for some time in the Physical Chemistry department of McG111 University, their object being the measurement of particle size by a light absorption method. Recently a new apparatus and technique were proposed: this investigation deals, in the first place, with an examina tion of the scope and sensitivity of this new apparatus and with the relation of its results to those of a previous apparatus. [...]  Lire la suite

Adsorption and desorption isotherms for water on standard cellulose were measured at two different temperatures, the heats of adsorption and desorption calculated and found tobe in qualitative agreement with previously measured heats of wetting as determined in an adiabatic calorimeter.It was definitely proved that the hysteresis which occurs in the adsorption and desorption of water by cellulose is not affected by the pressureof residual permanent gases. The apparent density of water adsorbed on standard cellulose at various concentrations was determined with ahigher degree of accuracy than had been previously obtained, by employing a modification of the apparatus used by other …  Lire la suite

The occurrence of partial sterility in Triticum-Agropyron amphiploids has proved to be a major hindrance to the breeding ot hardy perennial wheat and hardy, large-seeded, soil-binding forage crops in Canada and the United States. Following the first successful cross between Triticum and Agropyron credited by Armstrong (1936) to Tzitzin in 1930, extensive hybridization programs to achieve the aforementioned objectives were undertaken in these two countries and in the U.S.S.R. Approximately thirty species of Agropyron were used in crossing with the wheats and in a summary of these, eight were listed by Smith (1942) as having been successfully hybridized. [...]  Lire la suite

Heaman, Elsbeth Anne (Supervisor1)  Lire la suite

Between the mid-eighteenth and the mid-nineteenth centuries, the Crown coordinated a revolution in land usage in the Kawartha Lakes, as elsewhere in the colony, through 'civilization' and land redistribution. Attempts to change native society and build settler communities did not quite unfold the way the government intended. 'Civilization' helped the Mississauga farm and taught skills that eased interaction with colonial society, but they continued to produce much of their food by traditional means. Speculation isolated settlers and made land acquisition more difficult, though some speculators provided essential services. Most immigrants bought land privately and many were not able to establish …  Lire la suite

[...] Expressions are now available for the overall rate of polymerization and the average degree of polymerization which can be compared directly with experimental data. However, these are not sufficient to determine unambiguously the individual rate constants of the different elementary steps, having only two equations and at least three unknowns. Other expressions are required which combine these same unknowns with directly measurable quantities. One of these is the distribution function of the polymer formed after different lengths of time under various experimental conditions. Attempts have been made in this direction by Ginell and Simfca (10) and Eyring et al …  Lire la suite

Black Figure Floral Ware is an understudied style of pottery which was produced in Boiotia and the nearby regions of Euboia and Phokis during the fifth and fourth centuries B.C.E. Floral Style vases are painted with compositions formed predominantly of palmettes and lotuses rendered in black gloss without the incised details which are typically associated with Black Figure pottery. The corpus of Boiotian Floral Ware is divided into two sub-styles: the Northern Style and the Southern Style. The Northern Style is thought to have been produced in the area North and West of the Kopais while the Southern Style was …  Lire la suite

In view of a revival of interest in nuclear physics at McGill and in anticipation of the building of a cyclotron, a program of construction of auxiliary apparatus was started in 1936, in which the writer took part. Delays in the progress of the cyclotron scheme led to the suggestion that some project be undertaken using naturally radioactive sources. The appearance of the work of Bohr on the nature of nuclear reactions indicated that the scattering of alpha particles by the light nuclei might be expected to provide more immediate information concerning nuclear structure than had hitherto been supposed. These …  Lire la suite

Un jour, à sept heures du matin, Dumas se rendlt chez le baron Taylor, commissaire royal près du Theåtre-Français. 1l portait avec lui un drame hlstorique qu'il venait d'écrire, intitulé "Christine". Dumas, à cette époque était encore inconnu des cercles littéraires, mais, malgré son obscurité, le baron Taylor avait consenti à écouter la lecture de son oeuvre. [...]  Lire la suite

Hum, A. (Supervisor)  Lire la suite

The purpose of this study was to examine the links between child maltreatment and animal abuse, how these two forms of maltreatment often occur simultaneously within a family and how the existence of one maltreatment type should alert professionals to the potential for other types of harm. File reviews were completed at both Family and Children's Services of Renfrew County (FCS) and the Ontario Society for the Prevention of Cruelty to Animals (OSPCA), Renfrew County Branch. Data were collected on relevant variables, including maltreatment type, removal and return of children/animals, legal involvement and risk ratings. A total of 188 common …  Lire la suite

The present study examines the use of formal and informal supervision as it relates to determining burnout in child welfare social workers. This was measured by using the Maslach Burnout Inventory (MBI). Respondents were social workers in a small child protection agency. Using descriptive data and frequencies, results were used to focus directions for further research. The results indicate that only the length of formal supervision is significant in reducing emotional exhaustion in social workers (p < .05). Higher education levels were also seen as a protective factor against depersonalization (n = 16).  Lire la suite

Lloyd, F. (Supervisors)  Lire la suite

Winkler, C. (Supervisor)  Lire la suite

The following study is an attempt to ascertain the most adequate way to understand the relationship in modernity between religion and technology. This relationship is first analyzed by looking at a common way in which technology has been categorized and discussed as representing the religion of modernity. The first chapter critically evaluates several popular and scholarly works which contain arguments for understanding that the modern world participates in some kind of 'religion of technology.' The inadequacies of these arguments are shown to arise from the problematic ways in which they invoke the meanings of both religion and technology. The suggestive …  Lire la suite

With the recent major earthquakes experienced around the world and the adverse impacts on population, infrastructure and economy, various countries are increasingly concerned with improving their preparedness and resilience to the threat of seismic hazards. To this end, the utilization of high-performance protective systems, such as dampers and seismic isolation, is becoming a common practice for the seismic design of new buildings as well as the seismic retrofit of existing ones. Such devices have the potential to achieve a building response modification during an earthquake and protect its structural and non-structural content. This behaviour is particularly important for high-importance buildings, …  Lire la suite

Cette dissertation présente une approche basée sur le lieu pour l'étude des mondes sociaux des Tuniit (paléo-inuits) à Amittuq (le nord du bassin de Foxe), NU. Le problème central est l'identification et l'explication de la manière dont des communautés relationnelles, socialement diversifiées, ont été créées et redéfinies de manière répétée à travers des activités de création de lieu de différentes durées, échelles et intensités. À Amittuq, des lieux d'établissement persistants étaient intégraux à ces processus. Ce sont des lieux qui ont été occupés de manière répétée par les peuples Tuniit (env. 4500 – 600 BP) et qui perdurent comme sites …  Lire la suite

As the world transitions to a carbon neutral society to fight climate change ammonia looks to be a promising alternative to carbon-based fuel sources and for hydrogen storage. Since 1914 ammonia has been synthesized at the industrial scale by the Haber-Bosch process which produces 2 tons of carbon dioxide per ton of ammonia. With the discovery that water electrolysis can be used to produce green hydrogen, only the invention of a small-scale energy efficient ammonia synthesis process is needed to produce decentralized green ammonia. Non-thermal plasma catalytic synthesis of ammonia is theorized to have half the energy requirement when fully …  Lire la suite

The notion, which has persisted over many years, of Mary Shelley as the conservative daughter of a radical, proto-feminist mother can be traced to the views of Edward Trelawney, a contemporary and fair-weather friend of Shelley. This study, by exploring female identity, largely in terms of modern feminist psychoanalytic theory, in several of Shelley's lesser-known novels, attempts to contribute to the efforts of those who have challenged such notions and who have strived to render a more accurate portrait of Mary Shelley. Anne Mellor's discussion of female identity in Shelley's sentimental novels, Mathilda, Lodore and Falkner, (in her book Mary …  Lire la suite

Le syndrome du long QT est un trouble cardiaque associé à des arythmies ventriculaires qui peuvent conduire à des syncopes et à la mort subite. Les mutations conduisant à la perte de function de la gene de human ether-a-go-go related gene (hERG/KCNH2) cause le syndrome long QT de type 2 (LQT2). Le plus souvent, cette perte de fonction est une conséquence du trafic défectueux des mutants de hERG à la surface de la cellule, que font retenus et dégradé dans le réticulum endoplasmique. Cette étude a commencé par un criblage protéomique à la recherche des protéines que interagissent avec hERG …  Lire la suite

Chez l'homme, la famille d'enzymes histone déacétylase (HDAC) compte 18 membres. Ces protéines peuvent être répartis en quatre classes; dont la classe IIa est composée d'HDAC4, 5, 7 et 9. Les membres de cette classe agissent comme corépresseur de la transcription et interviennent dans une grande variété de processus physiologiques et pathologiques. En réponse à une gamme copieuse de signaux extracellulaire, les HDAC de la classe IIa sont phosphorylées sur trois ou quatre résidus sérine conservés. Cet événement crée des sites de liaison spécifiques pour les protéines 14-3-3, qui agissent comme chaperon et induisent l'exportation nucléaire des HDAC. De ce …  Lire la suite

One of the many border apparatuses that migrants and refugees face include the myriad ‘cooperative’ measures between European states and perceived ‘transit’ and/or ‘origin’ states- a form of externalized borderwork- that seeks to regulate the flows of migrants perceived to be heading toward Europe. Externalizing these borders has relied on a variety of policy instruments whereby the mainstreaming of migration priorities with development activities abroad is emerging as a central European policy priority. This thesis explores this trend empirically through a focused case study of the EU Emergency Trust Fund for Africa (EUTF-A) instrument to deconstruct (1) how we should …  Lire la suite

Dans le but de favoriser une compréhension plus profonde des possibilités pédagogiques liées à l'utilisation d'histoires vécues pour aborder des sujets « délicats » lors de l'enseignement d'une langue seconde, l'auteure a effectué une étude exploratoire basée sur une réflexion personnelle, décrivant son processus de raisonnement et sa démarche pour trouver du matériel potentiel pour l'enseignement de l'ALS dans la banque de données et les archives du projet Histoires de vie Montréal. Les directives pratiques et pédagogiques suggérées dans la présente thèse pourraient aider les enseignants d'ALS à éviter certaines difficultés et certains dangers pouvant surgir au moment d'aborder des …  Lire la suite

This study investigated the effects of a perceptual motor activities programme in a gymnasium on the visual perception of Grade One pupils. The sample was 199 subjects from eight classes in four schools. Experimental and control classes were randomly selected. Treatment and control lessons were taught by the physical educator in each school from detailed lesson plans. The classes met for twenty minute lessons three times each week for eight weeks. Test-retest data was obtained from each group through the use of the Marianne Frostig Developmental Test of Visual Perception. The data was categorized by sex, treatment, and subtest variables. …  Lire la suite

Social species, including humans, are highly motivated to form social bonds that are fundamental to their survival, cooperation, and reproduction. Communication governs the formation and maintenance of social relationships through the dynamic exchange between individuals sending and receiving communication signals. The ability to properly interpret such communication signals depends not only on the content and context of a signal, but also on individual experience. Social interactions throughout life appear to significantly shape perception, however, experience-dependent changes in perception remain poorly understood. The work presented in this thesis investigates the impact of experience, both during development and in adulthood, on auditory …  Lire la suite

A laboratory threshing unit was constructed utilising a standard tangential feed ("conventional") combine cylinder, concave, beater and transition grate. This unit was used to study the phenomenon of corn cob break-up and its effect on the performance of the threshing unit. It was found that the degree of corn cob break-up was affected by cylinder peripheral speed, cylinder-concave clearance and hybrid cultivar. Within the hybrid cultivars used, increased cob break-up was associated with decreased shelling efficiency and concave separation efficiency. The possibility of reducing kernel damage and increasing concave separation efficiency by changing some of the concave design parameters was …  Lire la suite

This thesis discusses some of the Operations Research efforts in the health care field, the theory and implementation of simulation techniques, and a deatiled model of the Biochemistry Laboratory of teh Royal Victoria Hospital, Montreal. Particular attention is given to an arriva; generation technique in which the arrival rate varies and the arrivals themselves are batched. Validation and expermiental runs are discussed, the latter with an orientation towards the impact of the implications on Management. Numerous computer generated plots are included in the appendices. The model is sufficiently general to be applied to other hospital laboratories.  Lire la suite

A dinuclear copper(II) complex has been investigated for promoting the transesterification of a phosphate diester, 2-hydroxypropyl-p-nitrophenyl phosphate (HPNP), that is a model for RNA. Rate enhancements of over 10$ sp5$ have been obtained at neutral pH over the background hydroxide rate. For this study the dinucleating ligand 2,6-bis ((bis(benzimidazolymethyl)amino)methyl) -p-cresol was prepared and the reactivity of the copper(II) complex for cleaving 2-hydroxypropyl-4-nitrophenyl phosphate was determined. The two metals were shown to be acting cooperatively by comparing the reactivity of the dinuclear complex to that of a mononuclear complex, copper(II) 2-(bi(benzimidazolymethyl)amino)methyl-4,6-dimethylphenol. A mechanism involving double Lewis acid activation of HPNP is …  Lire la suite

This project focused on the influence of perinatal anoxia and adolescent stress onthe adult locomotor response of rats to psychostimulants. Epidemiological evidencesuggests that obstetric complications can increase the risk for mental disorders includingschizophrenia and that early onset schizophrenia may be precipitated by stress duringadolescence. Taken together we hypothesized that these insults during two crucialperiods of brain maturation may manifest developmental alterations in dopamine (DA)function evident only at adulthood. Thus, I investigated the influence of perinatal anoxiaand chronic unpredictable adolescent stress (CUAS) on the adult locomotor response toamphetamine (AMPH) and cocaine (COC). In Study 1 I found that perinatal anoxia alonedid …  Lire la suite

The purpose of this study was to examine the differences between international certification standards for ice hockey helmets. The American Society for Testing and Materials (ASTM), Canadian Standards Association (CSA) and International Organization Standards (ISO) protocols were compared. Only the impact testing methods at ambient temperatures were examined. Four helmet models, currently available to consumers, were used for testing. No significant differences (p $<$ 0.05) were found between the standards in a rank order comparison. Further analysis of differences, with peak linear accelerations separated by impact locations showed significant differences (p $<$ 0.05) between all standards, at five of the …  Lire la suite

A model is presented to describe pp and pp scattering in the c.m.s. energy range from 5 Gev to 1.8 Tev. Although some attention is paid to properties of the differential cross section, the primary focus is on parametrizing the forward amplitude in a manner consistent with experimental measurements of the total cross section, the rho parameter, and the forward slope. The model is a hybrid, employing Regge Theory for energy dependence, dipole form factors for momentum transfer distributions, and impact parameter eikonalization is used to unitarize the amplitude. The model is first motivated, then the results of fits to …  Lire la suite

A considerable amount of work has been carried out for many years by various investigators on the problem of the relationship of inflammatory lesions in the pelvic organs to coincident bacterial infections in the upper urinary tract. All the possible methods of spread have in turn been held responsible and even in the present day there is no unanimity of opinion. A physician may rightly speak in terms of blood spread, a gynecologist of lymphatic spread, a urologist of one or other or both. [...]  Lire la suite

This thesis is a discursive and historical analysis of the concept and usage of 'postfeminism' in contemporary feminist debates. The importance of the vocabulary used to frame these debates is demonstrated through a survey of popular feminist discourses in the 1920s, and the circulation of the term 'postfeminism' in 1980s and 1990s mainstream and feminist media, academic journals, and bestselling books. Foremost among these contexts are mainstream newspaper and magazine articles in which postfeminism is used as a descriptive term applied to trends in fashion, television and film. Through an investigation of the texts and contexts in which post feminism …  Lire la suite

This thesis is an investigation of the relationship between the mass media and urban space, which takes as its object of analysis the concentration of newspaper buildings on Park Row in New York in the second half of the nineteenth century. By analysing five major New York newspapers and the architecture which housed them, commonalities in form, style and structure are revealed which are based on notions of display, spectacle, advertisement, order, and sensationalism. As daily newspapers achieved greater status in nineteenth century cities, their buildings increasingly took on Italian Renaissance, French Second Empire and Gothic forms, and became among …  Lire la suite

The present trend in psychiatric clinics is for the patient to have his initial interview with the caseworker. The first interview or interviews which the patient has with the caseworker, before he is assigned to a psychiatrist in the clinic, is the process known as social intake. There is a considerable amount of literature available on this subject and several articles have been published in the last few years about psychiatric clinics by both psychiatrists and caseworkers. It is probable that gradually growing acceptance of psychiatry on the part of the public has increased the demand for treatment in psychiatric …  Lire la suite

Aerosol particles are ubiquitous in nature and are important regulators of the atmosphere and our climate. When predicting the heating of our atmosphere, aerosol remain one of the largest uncertainties. For atmospheric aerosol, many fundamental microphysical questions still remain which contribute to these uncertainties. To improve our understanding of atmospheric aerosol at a fundamental level, we employ experimental and modelling methods to investigate the microphysical properties of single aerosol particles.In the atmosphere, organic aerosol can exist in highly viscous and glassy states. In these phases, diffusion becomes limited. One consequence of this is that water uptake and loss in response …  Lire la suite

Negativism was studied in nine autistic, nine behavior disturbed, and nine normal children aged five to 12 years in three different stimulus conditions (verbal requests for verbal responses, verbal requests for nonverbal responses, and nonverbal requests for nonverbal responses). Each condition included two tasks which were requested 15 consecutive times. Subjects demonstrated they could perform the tasks before testing, and their responses were scored according to the similarity between the response and the request. Results demonstrated the autistic and behavior-disturbed subjects responded similarly except when requests required verbal responses, in which case the autistic group was much more negative. The …  Lire la suite