Expression of protease-activated receptors in arthritic synovial tissues

Clinical and experimental evidence suggests that synovial thrombin formation in arthritic joints is prominent and deleterious, leading to exacerbation of rheumatoid arthritis (RA). In this context, cellular effects of thrombin mediated by the protease-activated receptors (PARs) in arthritic joints may be of paramount significance. Four PARs have now been identified. PAR1, PAR3, and PAR4 can all be activated by thrombin whereas PAR2 is activated by trypsin and few other proteases.We first explored PARs expression in RA synovial tissues. Synovial membranes from 11 RA patients were analyzed for PARs expression by RT-PCR and by immunohistology. PAR4 was found in all the biopsies, whereas the expression of PAR1, PAR 2 and PAR3 was more restricted (8/11, 5/11 and 3/11 respectively). In the arthritic synovial membrane of murine antigen-induced arthritis (AIA) we found coexpression of the four different PARs. Next, we explored the functional importance of PAR1 during AIA in vivo using PAR-1 deficient mice. The phenotype of PAR1-deficient mice (n = 22), based on the analysis of arthritis severity (as measured by 99 m tecnetium uptake, histological scoring and intra-articular fibrin measurements) was similar to that of wild-type mice (n = 24). In addition, the in vivo production of antibodies against mBSA was also similar. By contrast, the mBSA-induced in vitro lymph node cell proliferation was significantly decreased in PAR1-deficient mice as compared with controls. Accordingly, mBSA-induced production of interferon-γ by lymph node cells in culture was significantly decreased in PAR1-deficient mice as compared with controls, whereas opposite results were observed for production of IL-10

Knowledge and experience of medical students with male urethral catheterization

Background: Urethral catheterization is a commonly performed procedure. Therefore medical students should receive adequate training in this technique to avoid devastating consequences of performing it poorly. This study was aimed at finding out the knowledge and experience of final year medical students with the technique of male urethral catheterization.Methods: Well-structured questionnaire was administered to each of the final year medical students of Ladoke Akintola University of Technology (LAUTECH) one week to their final examinations.Results: All the 215 students received the questionnaire one week before their final examinations with 128 (60%) completing it. The male to female ratio was 1:1 with a mean age of 28 years. One hundred and twenty-five (98.4%) of the students had been throught male urethral catheterization. Thirty-five (27.6%) of the students have never performed male urethral catheterization. One hundred and fifteen students (90.6%) agreed that urethral catheterization is a sterile procedure. Sixty-nine (54.3%) students said xylocaine jelly should be used as lubricant.. Ninety four (74%) students said that they will inflate the balloon of the catheter when the Y junction gets to the tip of the penis. Forty-nine (38.6%) students said they are very confident about male urethral catheterization, 61 (48.0%) said reasonably confident while 5 (3.9%) are not confident at all.Conclusions: Urethral catheterization is a common procedure. Students should receive adequate instruction in this technique to avoid devastating consequences of performing it poorly

Parity‑related Changes in Body Weight May Influence the Zinc and Copper Status of Urban Pregnant Women: A Report from South Eastern Nigeria

Background: Micronutrient replacement is done indiscriminately, without recourse to peculiar socioeconomic and sociodemographic variables. Particularly, the relationship between parity, body weight, and some micronutrients has received minimal attention in Nigeria.Aim: To determine the relationship between parity, body weight, and some micronutrients during pregnancy.Subjects and Methods: This is a cross‑sectional study involving 130 pregnant women and 30 nonpregnant control. They were recruited from two health care facilities in Nigeria and grouped into nulliparous and multiparous. After a 24‑h dietary recall, the weight (W) and height (H) were measured. The body mass index (BMI) (W in kg/H in m2) was calculated. Serum copper and zinc were estimated using flame atomic absorption spectrophotometer.Results: Multiparous nonpregnant subjects parity=3.0 (0.58) had higher weight (P=0.037) and BMI (P=0.035) than their nulliparous counterparts (parity=0). In addition, there were no significant difference in Cu and zinc levels between the two groups (P=0.243 and 0.402, respectively). Expectedly, weight and BMI increased as pregnancy progressed. There was no significant difference in Cu levels between the three trimesters in the nulliparous pregnant and multiparous pregnant subjects. In the pregnant nulliparous subjects, the Zn levels of the 2nd and 3rd trimesters were significantly lower than that of the nonpregnant nulliparous subjects (P<0.001 and 0.039, respectively). However, in multiparous pregnant subjects, only the 3rd trimester Zn level was significantly lower than that of the nonpregnant controls (P=0.017). Conclusion: Pregnancy weight gain is more pronounced in multiparous than nulliparous women. This parity‑related pattern only affects the serum zinc levels, a situation that should be taken into consideration when formulating policies for nutritional replacement.  Keywords: Africa, body mass index, copper, parity, pregnancy, zin

Occult alpha globin gene mutations are the commonest causes of red cell microcytosis unexplained by phenotypic testing

HAA: Haematology Society of Australia and New Zealand, The Australian & New Zealand Society of Blood Transfusion and The Australasian Society of Thrombosis and HaemostasisAIM: Hypochromic microcytic anaemia is the hallmark phenotype of thalassaemia. Current phenotypic tests do not provide a diagnosis in a small proportion of patients with red cell microcytosis. We investigated the genetic basis of microcytosis in a cohort of such subjects. METHOD: We identified from a large cohort of 1684 unselected requests for thalassaemia testing 25 Chinese subjects who had unexplained microcytosis after phenotypic haemoglobin studies. Extensive genotypic analysis of the α and β globin gene cluster was performed in 20 of these subjects who had adequate DNA. Techniques employed included gap-polymerase chain reaction, amplification-refractory mutation system, Sanger sequencing and multiplex ligation-dependent …postprin

Dendritic Spine Shape Analysis: A Clustering Perspective

Functional properties of neurons are strongly coupled with their morphology. Changes in neuronal activity alter morphological characteristics of dendritic spines. First step towards understanding the structure-function relationship is to group spines into main spine classes reported in the literature. Shape analysis of dendritic spines can help neuroscientists understand the underlying relationships. Due to unavailability of reliable automated tools, this analysis is currently performed manually which is a time-intensive and subjective task. Several studies on spine shape classification have been reported in the literature, however, there is an on-going debate on whether distinct spine shape classes exist or whether spines should be modeled through a continuum of shape variations. Another challenge is the subjectivity and bias that is introduced due to the supervised nature of classification approaches. In this paper, we aim to address these issues by presenting a clustering perspective. In this context, clustering may serve both confirmation of known patterns and discovery of new ones. We perform cluster analysis on two-photon microscopic images of spines using morphological, shape, and appearance based features and gain insights into the spine shape analysis problem. We use histogram of oriented gradients (HOG), disjunctive normal shape models (DNSM), morphological features, and intensity profile based features for cluster analysis. We use x-means to perform cluster analysis that selects the number of clusters automatically using the Bayesian information criterion (BIC). For all features, this analysis produces 4 clusters and we observe the formation of at least one cluster consisting of spines which are difficult to be assigned to a known class. This observation supports the argument of intermediate shape types.Comment: Accepted for BioImageComputing workshop at ECCV 201

Validation of finite-element models of persistent-current effects in Nb3Sn accelerator magnets

Persistent magnetization currents are induced in superconducting filaments during the current ramping in magnets. The resulting perturbation to the design magnetic field leads to field quality degradation, particularly at low field, where the effect is stronger relative to the main field. The effects observed in NbTi accelerator magnets were reproduced well with the critical-state model. However, this approach becomes less accurate for the calculation of the persistent-current effects observed in Nb Sn accelerator magnets. Here, a finite-element method based on the measured strand magnetization is validated using three state-of-the-art Nb Sn accelerator magnets featuring different subelement diameters, conductor critical currents, magnet designs, and test temperatures. The temperature dependence of the persistent-current effects is reproduced. Based on the validated model, the impact of conductor design on the persistent-current effects is discussed. The strengths, limitations, and possible improvements of the approach are also discussed. 3

What People Believe about How Memory Works: A Representative Survey of the U.S. Population

Incorrect beliefs about the properties of memory have broad implications: The media conflate normal forgetting and inadvertent memory distortion with intentional deceit, juries issue verdicts based on flawed intuitions about the accuracy and confidence of testimony, and students misunderstand the role of memory in learning. We conducted a large representative telephone survey of the U.S. population to assess common beliefs about the properties of memory. Substantial numbers of respondents agreed with propositions that conflict with expert consensus: Amnesia results in the inability to remember one's own identity (83% of respondents agreed), unexpected objects generally grab attention (78%), memory works like a video camera (63%), memory can be enhanced through hypnosis (55%), memory is permanent (48%), and the testimony of a single confident eyewitness should be enough to convict a criminal defendant (37%). This discrepancy between popular belief and scientific consensus has implications from the classroom to the courtroom