Distribution of Allatostatin C-like Immunoreactivity in the Central Nervous System of the Copepod Crustacean \u3cem\u3eCalanus finmarchicus\u3c/em\u3e

The C-type allatostatins (C-ASTs) are a family of highly pleiotropic arthropod neuropeptides. In crustaceans, transcriptomic/mass spectral studies have identified C-ASTs in the nervous systems of many species; the cellular distributions of these peptides remain unknown. Here, the distribution of C-AST was mapped in the nervous system of the copepod Calanus finmarchicus, the major contributor to the North Atlantic’s zooplanktonic biomass; C-AST-immunopositive neurons were identified in the protocerebrum, in several peripheral ganglia associated with feeding appendages, and in the ganglia controlling the swimming legs, with immunopositive axons present throughout the ventral nerve cord. In addition, axons innervating the dorsal longitudinal and ventral longitudinal muscles of the body wall of the metasome were labeled by the C-AST antibody. While the distribution of C-AST-like immunoreactivity was similar between sexes, several differences were noted, i.e., two pair of somata located at the deutocerebral/tritocerebral border in males and immunopositive fibers that surround the genital opening in females. To place the C-AST-like labeling into context with those of several previously mapped peptides, i.e., A-type allatostatin (A-AST) and tachykinin-related peptide (TRP), we conducted double-labeling studies; the C-AST-like immunopositive neurons appear distinct from those expressing either A-AST or TRP (and through extrapolation, pigment dispersing hormone). Collectively, our data represent the first mapping of C-AST in crustacean neural tissue, show that sex-specific differences in the distribution of C-AST exist in the C. finmarchicus CNS, and suggest that the peptide may be involved in the modulation of both feeding and postural control/locomotion

A novel method for estimating myocardial strain: assessment of deformation tracking against reference magnetic resonance methods in healthy volunteers

We developed a novel method for tracking myocardial deformation using cardiac magnetic resonance (CMR) cine imaging. We hypothesised that circumferential strain using deformation-tracking has comparable diagnostic performance to a validated method (Displacement Encoding with Stimulated Echoes- DENSE) and potentially diagnostically superior to an established cine-strain method (feature-tracking). 81 healthy adults (44.6 ± 17.7 years old, 47% male), without any history of cardiovascular disease, underwent CMR at 1.5T including cine, DENSE, and late gadolinium enhancement in subjects >45 years. Acquisitions were divided into 6 segments, and global and segmental peak circumferential strain were derived and analysed by age and sex. Peak circumferential strain differed between the 3 groups (DENSE: -19.4 ± 4.8 %; deformation-tracking: -16.8 ± 2.4 %; feature-tracking: -28.7 ± 4.8%) (ANOVA with Tukey post-hoc, F-value 279.93, p<0.01). DENSE and deformation-tracking had better reproducibility than feature-tracking. Intra-class correlation co-efficient was >0.90. Larger magnitudes of strain were detected in women using deformation-tracking and DENSE, but not feature-tracking. Compared with a reference method (DENSE), deformation-tracking using cine imaging has similar diagnostic performance for circumferential strain assessment in healthy individuals. Deformation-tracking could potentially obviate the need for bespoke strain sequences, reducing scanning time and is more reproducible than feature-tracking

The effecta of 5-bromodeoxyyuridine and 5-fluorodeoxyuridine on differentiation and metamorphosis in xenopus laevis tadpoles

A Dissertation Submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg for the Degree of Master of Science March 1982The effects of '5-FUdR and 5-BUdR on differentiation and metamorphosis in Xenopus lacyis tadpoles were studied. In particular, a detailed study was made of the effects of 5-fUdR on cellular patterning and tissue differentiation during hind’imb development. Xenopus ,laevis tadpoles grown in solutions of 5-FUdR and 5-BUdR demonstrated hindlimb deformities* which were analysed by staining for cartilage visibility. Furthermore a comparison of the uptake of exogenous radioactive thymidine in the presence and absence of 5-FUdR by ^ejropus 1aevis tadpoles showed that 5-FUdR depressed exogenous thymidine uptahe, A buoyant density gradient analysis of G-BUdR-substituted DHA was undertaken using the analytical ultraccntrifuge. The resulting ultraviolet absorption photographs showed bands heavy and noria&l DMA, A aodel is proposed to explain the patterning of the Xenopus 1aevis hindlinb in the presence or absence of 5-FUdR

Helicobacter pylori infection is associated with an increased rate of diabetes.

ObjectiveChronic infections could be contributing to the socioeconomic gradient in chronic diseases. Although chronic infections have been associated with increased levels of inflammatory cytokines and cardiovascular disease, there is limited evidence on how infections affect risk of diabetes.Research design and methodsWe examined the association between serological evidence of chronic viral and bacterial infections and incident diabetes in a prospective cohort of Latino elderly. We analyzed data on 782 individuals aged >60 years and diabetes-free in 1998-1999, whose blood was tested for antibodies to herpes simplex virus 1, varicella virus, cytomegalovirus, Helicobacter pylori, and Toxoplasma gondii and who were followed until June 2008. We used Cox proportional hazards regression to estimate the relative incidence rate of diabetes by serostatus, with adjustment for age, sex, education, cardiovascular disease, smoking, and cholesterol levels.ResultsIndividuals seropositive for herpes simplex virus 1, varicella virus, cytomegalovirus, and T. gondii did not show an increased rate of diabetes, whereas those who were seropositive for H. pylori at enrollment were 2.7 times more likely at any given time to develop diabetes than seronegative individuals (hazard ratio 2.69 [95% CI 1.10-6.60]). Controlling for insulin resistance, C-reactive protein and interleukin-6 did not attenuate the effect of H. pylori infection.ConclusionsWe demonstrated for the first time that H. pylori infection leads to an increased rate of incident diabetes in a prospective cohort study. Our findings implicate a potential role for antibiotic and gastrointestinal treatment in preventing diabetes

Language, learning and electronic communications media

Guest editorial - article outline 1. Why is language significant? 2. Research settings 2.1. School age students: (i) text-based conferencing (ii) multimodal writing 2.2. University students: (i) text-based conferencing (ii) web-based literacy support 2.3. Informal adult learning: web-based reading 3. Methodologies for exploring language and learnin

Synthesis and assembly of gold and iron oxide particles within an emulsion droplet; facile production of Core@Shell particles

Here we report a method for synthesising and assembling nanomaterials at the liquid-liquid interface of an emulsion droplet, resulting in a simple strategy for producing hollow Au shells, or Fe3O4@Au core@shell particles. Mercaptododecanoic acid stabilised Au nanoparticles were added to the aqueous continuous phase, in order to stabilise hexane emulsion droplets formed within a microfluidic chip. The diameters of Au Pickering emulsions could be controlled by varying the flowrates, this produce hollowparticles. The addition of a second nanoparticle, Fe3O4 (average diameter of 12 nm), into the organic phase produced core@shell particles. The diameter of the resultant material was determined by the concentration of the Fe3O4. This report is the first to demonstrate Pickering emulsions within a microfluidics chip for the production of Fe3O4@Au particles, and it is believed that this could be a versatile platform for the large scale production of core@shell particles

Lengthened Predelivery Stay and Antepartum Complications in Women with Depressive Symptoms During Pregnancy

Background: It is crucial to understand the timing and mechanisms behind depression's effect on peripartum stay because attempts to intervene will vary based on the time period involved. We designed this study to compare predelivery and postdelivery length of stay in women with and without elevated depressive symptoms during pregnancy. Methods: This study involved secondary data analysis of a larger study exploring antepartum depression. Each subject completed the Center for Epidemiological Studies Depression Scale (CES-D) during pregnancy at a mean of 25.8 weeks' gestation. We used time-stamped data to compare total peripartum, predelivery, and postdelivery lengths of stay in women with and without elevated depressive symptoms during pregnancy. In addition, we used a Cox proportional hazards regression model to evaluate potential mechanisms for depression's effect on length of stay. Results: The study sample included 802 pregnant women. Overall, 18% of study subjects scored >=16 on the CES-D. Bivariate analyses demonstrated a significant association between elevated depressive symptoms and longer predelivery stays (time from admission to delivery). Interaction analyses demonstrated a significant interaction effect between depressive symptoms and parity, such that depressive symptoms were significantly associated with predelivery length of stay in multiparas but not so in primiparous subjects. In a multivariate model of multiparous subjects, depression's effect on length of stay was partially influenced by sociodemographic confounders but remained significant until antepartum complications were added to the model. Conclusions: Depressive symptoms during pregnancy are significantly associated with a subsequent increase in predelivery length of stay, and this association is mediated in part by antepartum complications, even after controlling for sociodemographic factors. These longer hospital stays can present significant burdens to the patient, her family, and the healthcare system. Future studies should evaluate whether interventions for depression during pregnancy can impact this relationship among depressive symptoms during pregnancy, antepartum complications, and extensive predelivery hospitalizations.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90486/1/jwh-2E2010-2E2380.pd