The Effects of Evolutionary Adaptations on Spreading Processes in Complex Networks

A common theme among the proposed models for network epidemics is the assumption that the propagating object, i.e., a virus or a piece of information, is transferred across the nodes without going through any modification or evolution. However, in real-life spreading processes, pathogens often evolve in response to changing environments and medical interventions and information is often modified by individuals before being forwarded. In this paper, we investigate the evolution of spreading processes on complex networks with the aim of i) revealing the role of evolution on the threshold, probability, and final size of epidemics; and ii) exploring the interplay between the structural properties of the network and the dynamics of evolution. In particular, we develop a mathematical theory that accurately predicts the epidemic threshold and the expected epidemic size as functions of the characteristics of the spreading process, the evolutionary dynamics of the pathogen, and the structure of the underlying contact network. In addition to the mathematical theory, we perform extensive simulations on random and real-world contact networks to verify our theory and reveal the significant shortcomings of the classical mathematical models that do not capture evolution. Our results reveal that the classical, single-type bond-percolation models may accurately predict the threshold and final size of epidemics, but their predictions on the probability of emergence are inaccurate on both random and real-world networks. This inaccuracy sheds the light on a fundamental disconnect between the classical bond-percolation models and real-life spreading processes that entail evolution. Finally, we consider the case when co-infection is possible and show that co-infection could lead the order of phase transition to change from second-order to first-order.Comment: Submitte

Relevance of Serum Levels of Interleukin-6 and Syndecan-1 in Patients with Hepatocellular Carcinoma

Syndecan-1 is a trans-membrane heparan sulfate proteoglycan that localizes in epithelial cells and has been shown to be present in normal hepatocytes. It is thought to be involved in processes such as cell growth, differentiation and adhesion. However, the clinical data regarding syndecan-1 in patients with hepatocellular carcinoma (HCC) are scarce and controversial. Therefore, we need to evaluate the effects of HCC on the serum levels of syndecan-1. Thus, 40 patients with HCC and 31 patients with liver cirrhosis were physically examined. Blood samples were taken for measurements of routine markers (sGPT, sGOT, bilirubin, albumin, and α-fetoprotein), as well as serum levels of interleukin (IL)-6 and syndecan-1. Patients with liver cirrhosis showed significant increase in serum IL-6 as compared with HCC patients and the control subjects. Serum level of syndecan-1 was significantly increased in HCC patients as compared with the cirrhotic and control groups. In addition, significant positive correlations between syndecan-1 and serum levels of ALT, AST in HCC patients were found. Moreover, syndecan-1 increased significantly with increasing stage of Barcelona-Clinic Liver Cancer Group diagnostic and treatment strategy. In conclusion, the development of HCC is accompanied by a significant elevation in serum syndecan-1 levels. The increase in serum syndecan-1 may be linked with progression of HCC

Oral direct-acting antivirals and the incidence or recurrence of hepatocellular carcinoma:a systematic review and meta-analysis

Background: The influence of direct-acting antiviral (DAA) therapy for chronic hepatitis C virus on the risk of hepatocellular carcinoma (HCC) is conflicting.  Methods: We conducted a systematic review and meta-analysis to determine the incidence or recurrence of HCC associated with oral DAA therapy. We searched PubMed, Scopus, Embase from inception to August 2017 to identify observational studies reporting on HCC among patients treated with DAAs. Two independent reviewers extracted data and assessed the risk of bias. Data were pooled by random-effects model. The primary outcome was the proportion of participants with incidence or recurrence of HCC (PROSPERO number CRD42017057040).  Results: After reviewing 2080 citations, we included 8 controlled studies and 36 uncontrolled studies. The pooled proportion for incident HCC was 1.5 % (95% CI 1.0% to 2.1%; I2=90.1%; n= 542/39 145) from 18 uncontrolled studies and 3.3% (95% CI 1.2% to 9%; I2 =96%; n=109/6909) from 5 controlled studies, respectively. The pooled proportion for recurrent HCC was 16.7% (95% CI 10.2% to 26%; I2=84.8%; n=136/867) from 12 uncontrolled studies and 20.1% (95% CI 5.5% to 52.1%; I2=87.5%; n=36/225) from 3 controlled studies, respectively. There was no statistically significant effect on the risk of recurrent HCC (OR 0.50, 95%CI 0.16 to 1.59; I2 =73.4%) in a meta-analysis of three studies.  Conclusions: Our findings show low proportion of incident HCC, but high proportion of recurrent HCC on treatment with DAAs. Continued active surveillance for HCC after treatment with DAAs remains prudent

Characterization of CTX-M ESBLs in Enterobacter cloacae, Escherichia coli and Klebsiella pneumoniae clinical isolates from Cairo, Egypt

<p>Abstract</p> <p>Background</p> <p>A high rate of resistance to 3^rdgeneration cephalosporins among Enterobacteriaceae isolates from Egypt has been previously reported. This study aims to characterize the resistance mechanism (s) to extended spectrum cephalosporins among resistant clinical isolates at a medical institute in Cairo, Egypt.</p> <p>Methods</p> <p>Nonconsecutive <it>Klebsiella pneumoniae </it>(Kp), <it>Enterobacter cloacae </it>(ENT) and <it>Escherichia coli </it>(EC) isolates were obtained from the clinical laboratory at the medical institute. Antibiotic susceptibility was tested by CLSI disk diffusion and ESBL confirmatory tests. MICs were determined using broth microdilution. Isoelectric focusing (IEF) was used to determine the pI values, inhibitor profiles, and cefotaxime (CTX) hydrolysis by the β-lactamases. PCR and sequencing were performed using <it>bla</it>_CTX-Mand IS<it>Ecp1</it>-specific primers, with DNA obtained from the clinical isolates. Conjugation experiments were done to determine the mobility of <it>bla</it>_CTX-M.</p> <p>Results</p> <p>All five clinical isolates were resistant to CTX, and were positive for ESBL screening. IEF revealed multiple β-lactamases produced by each isolate, including a β-lactamase with a pI of 8.0 in Kp and ENT and a β-lactamase with a pI of 9.0 in EC. Both β-lactamases were inhibited by clavulanic acid and hydrolyzed CTX. PCR and sequence analysis identified <it>bla</it>_CTX-M-14in Kp and ENT and a <it>bla</it>_CTX-M-15in EC. Both <it>bla</it>_CTX-M-14and <it>bla</it>_CTX-M-15were preceded by IS<it>Ecp1 </it>elements as revealed by partial sequence analysis of the upstream region of the <it>bla</it>_CTX-Mgenes. <it>bla</it>_CTX-M-15 was transferable but not <it>bla</it>_CTX-M-14.</p> <p>Conclusion</p> <p>This is the first report of CTX-M-14 in Kp and ENT isolates from Egypt, the Middle East and North Africa.</p

A Universe of Mirrors: The Mirror Metaphor in Ibn ʿArabī’s Thought in Relation to Ontology, Knowledge, and Perfection

The mirror metaphor is ubiquitous in sufi texts. It operates uniquely in Ibn ʿArabī’s thought and writings as a representation of his conception of the cosmos. Being, knowledge, and perfection are among the seminal themes of al-Shaykh al-Akbar’s thought, and the mirror metaphor is employed in revealing their reality in his writings. As opposed to Unity of Being, a term that Ibn ʿArabī does not employ, the mirror embodies the pillars of Ibn ʿArabī’s conception of Being through representing the quintessential huwa lā huwa, the configuration of oneness and manyness, and most importantly, the definition of the relation between God and the world. The mirror operates as the connective thread underlying Ibn ʿArabī’s thought. Through his concepts of the image and the ‘law of correspondence’, the role of the mirror as the configuration possibilizing knowledge, love, and perfection becomes manifest. The rather ordinary metaphor reveals the foundations of al-Shaykh al-Akbar’s thought, from rendering existence possible to accomplishing the ultimately epistemic purpose of creation

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An interview with Dr. Mohamed Selim, Journalism and Mass Communication professor at AUC, about the role Media played in the revolution

Conversion experiences of three white American Muslim males: The impact of centering and decentering forces

This phenomenological study describes the subjective experiences of three white American males‘ conversion to Islam. The study explored the experiences prior to and following the participants‘ conversion, as well as looked specifically at how their whiteness and masculinity influenced their life decisions. The focus of the study was primarily on how family, school, friends, and culture impacted their sense of identity which included their social placement, personal motivations, and spiritual development. Using a theoretical framework grounded in a blend of Postcolonialism, Feminist Theory, and Islamic epistemology, a unique culturally responsive research methodology was formulated in an effort to uphold a reciprocal and balanced approach which honored the voices of the researcher and the researched in a complementary manner. The findings reveal that these participants experienced marginalization due to non-white aligned or non-masculine aligned characteristics prior to their conversion to Islam. Findings also reveal how the individual characteristics of the participants were moved out of a position of marginalization within the American Muslim community causing a sense of social comfort. The experiences lay the foundations for a grounded theory of conversion of white American males to Islam. In addition, participants revealed a religio-masculine tension related to previous faith systems where acceptance of core beliefs on faith alone caused what was referred to as an 'intellectual break‘. This intellectual break seemed to be resolved since participants expressed a rational or logical connection with Islam. Finally, these participants shared what it is like to be a Muslim within the context of a post-9/11 America which privileges whiteness, masculinity, and secularism