691 research outputs found

    Algebraic Geometry Realization of Quantum Hall Soliton

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    Using Iqbal-Netzike-Vafa dictionary giving the correspondence between the H2_{2} homology of del Pezzo surfaces and p-branes, we develop a new way to approach system of brane bounds in M-theory on S1\mathbb{S}^{1}. We first review the structure of ten dimensional quantum Hall soliton (QHS) from the view of M-theory on S1\mathbb{S}^{1}. Then, we show how the D0 dissolution in D2-brane is realized in M-theory language and derive the p-brane constraint eqs used to define appropriately QHS. Finally, we build an algebraic geometry realization of the QHS in type IIA superstring and show how to get its type IIB dual. Others aspects are also discussed. Keywords: Branes Physics, Algebraic Geometry, Homology of Curves in Del Pezzo surfaces, Quantum Hall Solitons.Comment: 19 pages, 12 figure

    Comparing Strategies to Prevent Stroke and Ischemic Heart Disease in the Tunisian Population: Markov Modeling Approach Using a Comprehensive Sensitivity Analysis Algorithm.

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    Background. Mathematical models offer the potential to analyze and compare the effectiveness of very different interventions to prevent future cardiovascular disease. We developed a comprehensive Markov model to assess the impact of three interventions to reduce ischemic heart diseases (IHD) and stroke deaths: (i) improved medical treatments in acute phase, (ii) secondary prevention by increasing the uptake of statins, (iii) primary prevention using health promotion to reduce dietary salt consumption. Methods. We developed and validated a Markov model for the Tunisian population aged 35–94 years old over a 20-year time horizon. We compared the impact of specific treatments for stroke, lifestyle, and primary prevention on both IHD and stroke deaths. We then undertook extensive sensitivity analyses using both a probabilistic multivariate approach and simple linear regression (metamodeling). Results. The model forecast a dramatic mortality rise, with 111,134 IHD and stroke deaths (95% CI 106567 to 115048) predicted in 2025 in Tunisia. The salt reduction offered the potentially most powerful preventive intervention that might reduce IHD and stroke deaths by 27% (−30240 [−30580 to −29900]) compared with 1% for medical strategies and 3% for secondary prevention. The metamodeling highlighted that the initial development of a minor stroke substantially increased the subsequent probability of a fatal stroke or IHD death. Conclusions. The primary prevention of cardiovascular disease via a reduction in dietary salt consumption appeared much more effective than secondary or tertiary prevention approaches. Our simple but comprehensive model offers a potentially attractive methodological approach that might now be extended and replicated in other contexts and populations

    Penerapan Model Pembelajaran Make a Match Pada Mata Pelajaran Pkn Untuk Meningkatkan Aktivitas Belajar Siswa

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    This study , entitled " Application of Learning Model Make A Match At PKN Subject To Enhance Student Learning Activities , with the formulation of the problem , " Is Learning Model through Make A Match on Civics Lesson can enhance students' learning activities . The purpose of this study to increase the activity , creativity and understanding of student learning through the application of learning models Make A Match on subjects Civics students . This classroom action research generally aims to motivate students in the learning process to improve student learning activities with the Application Model. Action research results after taking action on cycles I and II was found to increase students' learning motivation activity . It can be seen from the results of the action research cycle I and II on the observation of students' learning activities , which in the first cycle of learning activities of students who have an average of 66 % grade and the second cycle increased to 81 % . The success improving student learning activities through Learning Model Make A Match is expected to provide an alternative to improve the ability of students in the learning process , especially Civics

    Microwave treatment modify antigenicity properties of bovine milk proteins

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    This work is aimed to assess the effect of a microwave heating on cow’s milk protein antigenicity. The heating protocol is established on the power/time relationship. A first share of milk samples were treated at 300 and 400 watts for 10, 15 and 20 min. The second share of milk and whey samples weretreated at 500, 600 and 700 watts for 10 min. The antigenicity of proteins is evaluated by a study of milk sample reactivity towards the IgG anti--Lg (obtained from immunized rabbits) using ELISA method. Microwave treatment of whole milk cause significant decrease of whey proteins concentration thansamples of fresh whey treated. Electrophoresis analysis reveals that whole milk treated by microwave induces more changes in whey proteins composition. Microwave heating of entire cow’s milk seems to diminish its whey proteins reactivity towards the specific antibodies (IgG)

    Effect of a hyper-protein diet on Wistar rats development and intestinal function

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    This study was designed to investigate the long-term effects of a high-protein diet on the functional and histological structure of the intestinal epithelium. Sixteen adult male Wistar rats (180 ± 2.27 g) were divided into two groups: 1) the control group, (n = 30) were fed a normal diet of 14% protein; 2) the P50- group (n = 30) were fed a 50% protein diet. The effects of a high-protein diet were studied over a periodof 2 months. Functional and morphological differences between the high-protein and control groups were compared. Internal organs (liver, stomach, lungs, heart, kidneys, spleen, intestine, skin, surrenalglands, white and brown adipose tissues) were removed from each sacrificed animal. The organs were weighed, and histological studies were performed on jejunal fragments. The weight of the P50 grouprats increased 79%, while the weight of the control-group increased 98% (p< 0.01 0.05). The weight of the white adipose tissue, the skeleton and the skin were significantly greater in control-group rats (p< 0.01). An important modification of the epithelial structure in the intestine was observed in rats of the P50 group. The average length of their villi was significantly reduced and there was a significantincrease in their IEL (p< 0.01). Our results indicate that ingestion of a protein-rich diet over a long period leads to modification of the histological structure of the intestinal epithelium, as indicated by;pronounced atrophy of mucosa; marked inflammatory infiltration of lymphocytes in the chorion; and many intra-epithelial lymphocytes

    Growth, acidification and proteolysis performance of two co-cultures (Lactobacillus plantarum-Bifidobacterium longum and Streptococcus thermophilus-Bifidobacterium longum)

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    In this study, the fermentation and proteolysis of two co-cultures were investigated. Two fermented cow skim-milk lactoferrin 1 (LF1) and lactoferrin 2 (LF2) were prepared. LF1 was inoculated with Bifidobacterium longum (Bf I) and Streptococcus thermophillus (St I) while LF2 was inoculated with Lactobacillus plantarum (Lb O) and B. longum (Bf I). Incubation was at 42&#176;C for 8 h. The enumeration revealed bacterial growth in all fermented milk. Maximum growth of (Lb O) and (Bf I) was observed when mixed together after 2 h of fermentation in comparison with Bf I and St I with values of 109 and 3.108 cfu/ml, respectively. The kinetics of acidification (pH and lactic acid production) gave significant values (p &lt; 0.01) for LF2 when compared to LF1 and sterile milk (LS). The proteolytic activity (functions &#945;-NH2 released in M/mg) and total proteins (in &#956;g/mg) gave significant values (p &lt; 0.05) for LF2 when compared to LF1. Two mixed cultures (Lb O- Bf I) and (St I-Bf I) showed proteolysis of &#223;-lactoglobulin (&#223;-Lg) and -lactalbumin (&#945;-la)

    Trends in Secondary Prevention of Coronary Heart Disease in Tunisia: Prevention of Recurrences of MI and Stroke

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    ObjectivesThe survival benefits achieved by prescription of antiplatelet agents, B-adrenoreceptor antagonists (beta-blockers), angiotensin II receptor blockers (ARB), and lipid lowering agents in patients surviving the myocardial infarction (MI) have been well documented in large clinical trial. Despite well-established benefits, these pharmacological agents continue to be underutilized. The main objective of this study was to evaluate the progress of cardiovascular secondary prevention practices in Tunisia.MethodsThe PREMISE (Prevention of Recurrence of Myocardial Infarction and Stroke) is a descriptive, cross-sectional study conducted in Tunisia in two phases (2002 and 2009). Seven hundred eighty two patients were recruited. The recruitment criteria were: previous MI, stable angina, unstable angina, percutaneous transluminal coronary angioplasty (PTCA), coronary artery bypass graft (CABG), stroke, transient ischemic attack (TIA) or carotid endarterectomy. This analysis is limited to coronary heart disease (CHD) patients. Five hundred hospital patients were interviewed and their medical records were reviewed: 250 in 2002 and 250 in 2009. Patients were included if they had confirmed diagnosis of MI, angina, CABG or PTCA, and if their first cardiovascular event had occurred more than one month but not later than 3 years ago. We compared the total of both patient groups, using the prevalence of Cardio-Vascular Risk Factors (CVRF) and the treatment prescribed at hospital discharge.ResultsThe proportion of patients with reported hypertension, diabetes, hypercholesterolemia and current smoker patients had decreased. Concerning pharmacological prescriptions, a significant increase was observed in prescribing statins (38.9% vs. 70.3%) and ACE inhibitors (49.3% vs. 69.9%), non pharmacological prescriptions as healthy diet or tobacco cessation had opposite trends. Adherence to treatment did not change substantially.ConclusionAlthough the use of cardioprotective drugs had increased in CHD patients, there are still gaps in secondary prevention in Tunisia. The recommended strategies of secondary prevention need to be applied more intensively in clinical practice
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