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Search Results: 1 - 10 of 402073 matches for " M. Joyce "
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Primordial Magnetic Fields, Right Electrons, and the Abelian Anomaly
M. Joyce,M. Shaposhnikov
Physics , 1997, DOI: 10.1103/PhysRevLett.79.1193
Abstract: In the standard model there are charges with abelian anomaly only (e.g. right-handed electron number) which are effectively conserved in the early universe until some time shortly before the electroweak scale. A state at finite chemical potential of such a charge, possibly arising due to asymmetries produced at the GUT scale, is unstable to the generation of hypercharge magnetic field. Quite large magnetic fields ($\sim 10^{22}$ gauss at $T\sim 100$ GeV with typical inhomogeneity scale $ \sim \frac{ 10^6}{T}$) can be generated. These fields may be of cosmological interest, potentially acting as seeds for amplification to larger scale magnetic fields through non-linear mechanisms. Previously derived bounds on exotic $B-L$ violating operators may also be evaded.
Historic aspects of human susceptibility to leprosy and the risk of conjugal transmission
Joyce, M Patricia;
Memórias do Instituto Oswaldo Cruz , 2012, DOI: 10.1590/S0074-02762012000900004
Abstract: estimates of genetic susceptibility to leprosy were made in the past from observational reports in familial settings using descriptive epidemiologic data. risk of conjugal transmission of leprosy (from one spouse to another) has been estimated between 1-10% and is thought to occur in 3-5% of spouses exposed to untreated lepromatous disease in the partner. risk of secondary transmission is presumed higher in other family members than for the conjugal partner. this belief has become dogma to many leprologists who may no longer know the basis for this estimation. this article reviews the historic epidemiologic descriptions of risk for leprosy transmission in married couples compared to other family members. although uncommon, conjugal leprosy occurs and at higher rates in populations with traditional familial intermarriage and consanguinity.
Joyce M.Laurens
Dimensi : Journal of Architecture and Built Environment , 2006,
Abstract: The increase of crime statistics in urban residential area, and the fact that there is no particular guidance for Indonesian architects which explicitly refers to crime prevention, leads the Housing Development Research Centre, Department of Housing and Regional Infrastructure, to promote a research, which aims to set out guidance dealing with principles of crime prevention in urban housing. In reference to the situational approach, or more specifically as "crime prevention through environmental design", this research studies the relationship between building typo-morphology and environmental behaviour. The case study, -urban residential areas with high, medium dan low crime statistics-, shows that environment can be manipulated to reduce opportunities for commiting crime. Abstract in Bahasa Indonesia : Meningkatnya tindak kriminal di kawasan perumahan kota, serta belum adanya panduan bagi perancang di Indonesia yang mengacu pada usaha mencegah terjadinya tindak kriminal, mendasari penelitian yang diprakarsai oleh Pusat Penelitian Pengembangan Pemukiman, Departemen Permukiman dan Prasarana Wilayah. Penelitian ini dibuat untuk menyusun panduan desain dengan prinsip pencegahan tindak kriminal di pemukiman kota. Dengan mengacu pada pendekatan situasional, atau secara spesifik dikenal sebagai "pencegahan tindak kriminal melalui perancangan lingkungan" (Crime Prevention Through Environmental Design-CPTED), penelitian ini mempelajari hubungan antara tipologi bangunan dan morfologi kawasan dengan perilaku lingkungan. Dari obyek studi, -kawasan dengan tingkat kriminalitas tinggi, sedang dan rendah-, terlihat bahwa lingkungan dapat berperan dalam mengurangi peluang terjadinya tindak kriminal. Kata kunci: perilaku lingkungan, kriminalitas, perancangan pemukiman kota
Joyce M. Laurens
Dimensi : Journal of Architecture and Built Environment , 2003,
Abstract: Architectural forms are created by human minds. Because of this they are tied tightly to the perceptual experience and concept of designer. Designers are creating images and models for thought and communication, through which the intentions of a design idea may be captured and transmitted, so that the concepts can be understood, and perceived as reality. In a creative design process, a wide range of media are applied. It plays an important role, not only in conveying architectural messages and but also in operating as a catalyst to explore design ideas. This paper discusses the role of design media on the reception and conception of the architectural message. Abstract in Bahasa Indonesia : Bentuk arsitektur diciptakan oleh pikiran manusia. Oleh karena itu bentuk-bentuk arsitektur sangat terkait pada pengalaman dan konsep perseptual perancangnya. Perancang menciptakan imaji-imaji dan model bagi pemikiran dan komunikasi sedemikian rupa agar gagasan desainnya dapat ditangkap dan dipancarkan, sehingga pada akhirnya konsep arsitek bisa dimengerti dan diterima sebagai realitas. Dalam proses desain kreatif, beragam jenis media desain dapat digunakan. Media ini memainkan peran penting bukan hanya sebagai pengantar informasi atau pesan arsitektural saja, akan tetapi juga berperan sebagai katalisator dalam menggali dan mengembangkan gagasan desain. Tulisan ini akan menelaah peran media desain tersebut terhadap penerimaan dan konsepsi pesan arsitektural. Kata kunci: desain arsitektur, imaji-persepsi, komunikasi
C. Trompetter, Agriculture, proto-industry and mennonite entrepreneurship. A history of the textile industries in Twente 1600-1815
Joyce M. Mastboom
BMGN : Low Countries Historical Review , 1999,
Baryogenesis from `electrogenesis' in a scalar field dominated epoch
M. Joyce,T. Prokopec
Physics , 2000, DOI: 10.1088/1126-6708/2000/10/030
Abstract: Scalar fields can play a dominant role in the dynamics of the Universe until shortly before nucleosynthesis. Examples are provided by domination by a kinetic mode of a scalar field, which may be both the inflaton and the late time `quintessence', and also by more conventional models of reheating. The resultant modification to the pre-nucleosynthesis expansion rate can allow solely an asymmetry in right handed electrons to produce a net baryon asymmetry when reprocessed by the anomalous B+L violating processes of the standard model. The production of such a source asymmetry - what we term `electrogenesis' - requires no additional B or L violation beyond that in the standard model. We consider a specific model for its generation, by a simple perturbative out of equilibrium decay of Higgs like scalar fields with CP-violating Yukawa couplings to the standard model leptons. We show that, because of the much enhanced expansion rate, such a mechanism can easily produce an adequate asymmetry from scalars with masses as low as 1 TeV. Kinetic mode domination is strongly favoured because it evades large entropy release which dilutes the asymmetry. We also discuss briefly the effect of the abelian hypercharge anomaly.
Investigating the Consistency of Stellar Evolution Models with Globular Cluster Observations via the Red Giant Branch Bump
M. Joyce,B. Chaboyer
Physics , 2015, DOI: 10.1088/0004-637X/814/2/142
Abstract: Synthetic RGBB magnitudes are generated with the most recent theoretical stellar evolution models computed with the Dartmouth Stellar Evolution Program (DSEP) code. They are compared to the observational work of Nataf et al., who present RGBB magnitudes for 72 globular clusters. A DSEP model using a chemical composition with enhanced $\alpha$ capture [$\alpha$/Fe] $ =+0.4$ and an age of 13 Gyr shows agreement with observations over metallicities ranging from [Fe/H] = $0$ to [Fe/H] $\approx-1.5$, with discrepancy emerging at lower metallicities.
Menaquinone (Vitamin K2) Enhancement of Staphylococcus aureus Biofilm Formation  [PDF]
Derek T. Kirby, Joyce M. Savage, Balbina J. Plotkin
Journal of Biosciences and Medicines (JBM) , 2014, DOI: 10.4236/jbm.2014.21004

During infection, Staphylococcus aureus is exposed to exogenous menaquinone which is essential for the human blood clotting cascade. The effect of exogenous menaquinone on S. aureus phenotypic expression is not known. To test whether menaquinone affects expression of virulence-associated phenotypes, methicillin-sensitive (MSSA) and -resistant (MRSA) S. aureus strains (n = 8) were grown in the presence of menaquinone (0.001 - 12 μg/ml). Capsule production, biofilm formation (plastic and fibronectin-coated microtiter plates) and carotenoid levels were determined spectrophotometrically after growth in Mueller Hinton broth (MH; 24-hr, 37°C). All experiments were, at minimum, done in triplicate and repeated twice. Menaquinone at physiologic levels (0.01 μg/ml MH) significantly increased (p < 0.05) biofilm formation on plastic in a manner that was bacterial population size dependent. In addition, menaquinone (0.05 - 4 μg/ml) significantly increased (p < 0.05) biofilm formation on

PTEN deficiency: a role in mammary carcinogenesis
Teresa Petrocelli, Joyce M Slingerland
Breast Cancer Research , 2001, DOI: 10.1186/bcr322
Abstract: Cancer is a multi-step process involving the mutation of genes regulating cell proliferation, differentiation, and survival, leading to escape from normal tissue boundaries and sustained angiogenesis [2]. Given the plethora of genetic alterations observed in primary breast cancers, it has been difficult to establish which are involved in initiation, progression and metastasis. Despite often significant difficulties in the interpretation of their relevance to human disease, mouse models have provided experimental tools to investigate genetic pathways altered in breast cancer. Furthermore, the interbreeding of different TG or gene-deficient mouse models can reveal the potential for cooperation between different signaling pathways.Mammary tumors induced following mouse mammary tumor virus (MMTV) infection have revealed oncogenes involved in murine mammary tumorigenesis. Random insertion of proviral MMTV DNA into mouse mammary epithelial cells results in insertional mutagenesis and oncogenic activation of various genes, including those of the Wnt, Fgf, and notch families, and eIF-3p48. The first proto-oncogene to be cloned from MMTV-induced mammary cancers was Wnt-1 [3], a member of a family of secreted cysteine-rich glycoproteins, which controls cell fate/patterning through stabilization of β-catenin and activation of the downstream transcription factor T cell factor (TCF/LEF). MMTV-Wnt-1 TG mice develop mammary tumors histopathologically similar to human breast cancers. These mice develop extensive mammary hyperplasia, and tumors progress to adenocarcinomas in a temporally predictable manner [4]. Although overexpression of Wnt-1 has not been observed in human breast cancers, several downstream components of the Wnt signaling pathway are deregulated in human cancers, including adenomatous polyposis coli, β-catenin, c-Myc, and cyclin D1 [5]. Moreover, overexpression of a stable transcriptionally active β-catenin in a mouse mammary model induced multiple aggressive mamma
Oral health behavior patterns among Tanzanian university students: a repeat cross-sectional survey
Anne ?str?m, Joyce Masalu
BMC Oral Health , 2001, DOI: 10.1186/1472-6831-1-2
Abstract: The population targeted was students attending the Muhimbili University College of Health Sciences (MUCHS) at the University of Dar es Salaam (UDSM), Dar es Salaam, Tanzania. Cross-sectional surveys were conducted and a total of 635 and 981 students, respectively, completed questionnaires in 1999 and 2001.Cross-tabulation analyses revealed that in 1999, the rates of abstinence from tobacco use, and of soft drink consumption, regular dental checkups, and intake of chocolate/candy were 84%, 51%, 48%, and 12%, respectively, among students of urban origin and 83%, 29%, 37%, and 5% among their rural counterparts. The corresponding rates in 2001 were 87%, 56%, 50%, and 9% among urban students and 84%, 44%, 38%, and 4% among rural ones. Multiple logistic regression analyses controlling for sex, age, place of origin, educational level, year of survey, and their interaction terms revealed a significant increase in the rate of soft drink consumption, implementation of oral hygiene measures, and abstinence from tobacco use between 1999 and 2001. Social inequalities observed in 1999, with urban students being more likely than their rural counterparts to take soft drinks and go for regular dental checkups, had leveled off by 2001.This study provides initial evidence of oral health behavioral trends, that may be utilized in the planning of preventive programs among university students in Tanzania.In socioeconomically developing countries, the change from a traditional lifestyle to a Western lifestyle has, among other things, led to an increase in sugar consumption from food and beverages, and in the form of chocolate/candy [1]. Higher caries prevalence is anticipated following increased consumption of sugar especially since for the majority, fluoridated toothpaste is not easily available. In Tanzania, liberalization of trade links with industrialized countries has brought about imports of greater quantities of sugar; also, commercialized sugar products have increasingly gained so
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