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Moncton, Canada

The Université de Moncton is a French language university located in Edmundston, Moncton and Shippagan, New Brunswick, Canada serving the Acadian community of Atlantic Canada. It is the only francophone university in New Brunswick and is one of only two such universities in the Maritimes, the other being the Université Sainte-Anne in Pointe-de-l'Église, Nova Scotia, Canada. It is also the largest French language university in Canada that is outside of Québec. Wikipedia.

Obesity is a major health problem, contributing to the development of various diseases with aging. In humans, obesity has been associated with reduced testosterone production and subfertility. Adipose tissue is an important source of hormones having influences on both metabolism and reproduction. Among them, the production and secretion of adiponectin is inversely correlated to the severity of obesity. The purpose of this review of literature is to present the current state of knowledge on adiponectin research to determine whether this hormone affects reproduction in men. Surprisingly, evidences show negative influences of adiponectin on GnRH secretion from the hypothalamus, LH and FSH secretion from the pituitary and testosterone at the testicular level. Thus far, the involvement of adiponectin in the influence of metabolism on reproduction in men is limited. However, adiponectin and its receptors are expressed by different cell types of the male gonad, including Leydig cells, spermatozoa, and epididymis. In addition, actions of adiponectin at the testicular level have been shown to promote spermatogenesis and sperm maturation. Therefore, autocrine/paracrine actions of adiponectin in the testis may contribute to support male reproductive function. © Springer Science+Business Media New York 2013. Source

Hamam H.,University of Moncton
Optics Letters

A steganographic method offering a high hiding capacity is presented in which the techniques of digital holography are used to distribute information from a small secret image across the larger pixel field of a cover image. An iterative algorithm is used to design a phase-only or complex hologram from a padded version of the secret image, quantizing this data according to the carrier data bits that are available within the intended cover image. By introducing the hologram data only into low-order bits of larger amplitude cover pixels, the change in the cover image remains imperceptible to the casual observer, with a peak signal-to-noise ratio of >40 dB. © 2010 Optical Society of America. Source

Villard M.-A.,University of Moncton | Hache S.,University of Alberta
Biological Conservation

Many authors have concluded that habitat loss has a greater influence on biodiversity than habitat fragmentation . per se. Yet, several animal species have been shown to be reluctant to move across inhospitable landscape matrices, a phenomenon that would be expected to exacerbate fragmentation effects. In this study, we tested the ability of a forest songbird (Ovenbird, . Seiurus aurocapilla) to move across two contrasting landscapes whose matrix (intensively managed forest) would be expected to be relatively permeable compared to agricultural or urban matrices. We hypothesized that males would be less likely to return to their territory in a landscape dominated by forest generally unsuitable for breeding (spruce plantations) than in another dominated by potential breeding habitat (deciduous forest). The probability of resighting translocated males (. n=. 48) on their territory was significantly lower in the plantation landscape and this relationship was consistent over two successive years. Neither translocation time nor body mass, time of capture, or structural size were significant predictors of probability of resighting. Although this species is sufficiently vagile to return quickly to its territory (e.g. one male returning in less than 2. h), these results indicate that even a forested matrix may impose a resistance to the movements of a forest bird species when its structure or composition differs from that of breeding habitat. Matrix resistance to movements potentially restricts the ability of individuals to detect and colonize suitable habitat fragments. Less vagile species would be even more affected and, therefore, we submit that a more inclusive perspective on effects of landscape change is warranted. © 2012 Elsevier Ltd. Source

Forshaw J.R.,University of Manchester | Sandapen R.,University of Moncton
Physical Review Letters

We show that anti-de Sitter/quantum chromodynamics generates predictions for the rate of diffractive ρ-meson electroproduction that are in agreement with data collected at the Hadron Electron Ring Accelerator electron-proton collider. © 2012 American Physical Society. Source

Bourgoin L.-H.,University of Moncton | Tremblay L.,University of Moncton
Geochimica et Cosmochimica Acta

Amino acids and the bacterial biomarkers muramic acid and d-amino acids were quantified in the ultrafiltered dissolved, particulate and sedimentary organic matter (UDOM, POM and SOM) of the St. Lawrence system (Canada). The main objectives were to better describe the fate of terrigenous and marine organic matter (OM) in coastal zones and to quantify the bacterial contributions to OM composition and diagenesis. Regardless of their origin, the carbon (C) content of the particles substantially decreased with depth, especially near the water-sediment interface. Major diagenetic transformations of organic nitrogen (N) were revealed and important differences were observed between terrigenous and marine OM. Amino acid contents of particles decreased by 66-93% with depth and accounted for 12-30% of the particulate C losses in marine locations. These percentages were respectively 18-56% and 7-11% in the Saguenay Fjord where terrigenous input is important. A preferential removal of particulate N and amino acids with depth or during transport was measured, but only in marine locations and for N-rich particles. This leads to very low amino acid yields in deep marine POM. However, these yields then increased to a level up to three times higher after deposition on sediments, where SOM showed lower C:N ratios than deep POM. The associated increase of bacterial biomarker yields suggests an active in situ resynthesis of amino acids by benthic bacteria. The N content of the substrate most likely determines whether a preferential degradation or an enrichment of N and amino acid are observed. For N-poor OM, such as terrigenous or deep marine POM, the incorporation of exogenous N by attached bacteria can be measured, while the organic N is preferentially used or degraded in N-rich OM. Compared to the POM from the same water samples, the extracted UDOM was poor in N and amino acids and appeared to be mostly made of altered plant and bacterial fragments. Signs of in situ marine production of UDOM were observed in the most marine location. The POM entering the St. Lawrence Upper Estuary and the Saguenay Fjord appeared made of relatively fresh vascular plant OM mixed with highly altered bacterial debris from soils. In contrast, the POM samples from the more marine sites appeared mostly made of fresh planktonic and bacterial OM, although they were rapidly degraded during sinking. Based on biomarker yields, bacterial OM represented on average ∼20% of bulk C and approximately 40-70% of bulk N in POM and SOM, with the exception of deep marine POM exhibiting approximately two times lower bacterial contributions. © 2010 Elsevier Ltd. Source

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