We use an exhaustive generation with isomorph-rejection to classify three types of structured digraphs. The first type is the class of regular digraphs where each vertex has the same number of out-neighbors and inneighbors. The second type is the class of normally regular digraphs introduced by Jørgensen. In these digraphs, the number of common out-neighbors (or inneighbors) of vertices x and y...

Schiller-Duval body is a distinctive pathological structure seen in the endodermal sinus pattern of yolk sac tumor. This manuscript provides a concise review about this structure and the scientists behind it. *Corresponding author: Dr. Khalid Al Aboud, King Faisal Hospital, Makah, Saudi Arabia, P.O Box 5440, Makah 21955, Saudi Arabia, E-mail: [email protected] Received January 25, 2014; Accept...

We consider directed strongly regular graphs de2ned in 1988 by Duval. All such graphs with n vertices, n6 20, having a vertex-transitive automorphism group, are determined with the aid of a computer. As a consequence, we prove the existence of directed strongly regular graphs for three feasible parameter sets listed by Duval. For one parameter set a computer-free proof of the nonexistence is pr...

ERIK Duval, full professor at the Computer Science Department of KU Leuven, passed away on 12 March, 2016, after a two-year illness with cancer, T-ALL Leukaemia. He was 50. During these two years, he was still supervising his team and as always sharing his great thoughts with all of us. He was optimistic, as always, and we were all optimistic for him. It was only in the last few weeks that unex...

Recent interest in the “memory effect” prompted us to revisit relation of gravitational waves oscillators. 50 years ago Niederer (1973) found that an isotropic harmonic oscillator with a constant frequency can be mapped onto free particle. Later Takagi (1990) has shown “time-dependent scaling” extends versus particle correspondence time-dependent when scale factor satisfies Sturm–Liouville equa...

The purpose of this study was to compare the results of fruit and vegetable intake data from the 2009, 2011, 2013 Duval County Youth Risk Surveys (YRBS) by health zone. The survey instrument (questionnaire) is administered using a cluster sample design in all ninth grade classes in public schools (except charter schools) every two (odd) years. The surveys are anonymous and there is parental not...

8. Pawlotsky JM, Belec L, Gresenguet G, Deforges L, Bouvier M, Duval J, et al. High prevalence of hepatitis B, C and E markers in young sexually active adults from the Central African Republic. J Med Virol. 1995;46:269–72. 9. Guthmann JP, Klovstad H, Boccia D, Hamid N, Pinoges L, Nizou J, et al. A large outbreak of hepatitis E among displaced population in Darfur, Sudan, 2004: The role of water...

Yvette Duval’s publications offer diverse and contrasting aspects about the dynamism of late-antique North Africa. I have underlined extent to which they were able exert a considerable influence in recent historiography. The ideas defended her various articles books cannot leave anyone indifferent. Discussing them, drawing up critical assessment, seeing them questioned, does not mean doing an i...

1. Zhou J, Ditangco R. Predict immune reconstitution syndrome [letter]. Clin Infect Dis 2006; 43:147–8 (in this issue). 2. Robertson J, Meier M, Wall J, et al. Immune reconstitution syndrome in HIV: validating a case definition and identifying clinical predictors in persons initiating antiretroviral therapy. Clin Infect Dis 2006; 42:1639–46. 3. Zhou J, Kumarasamy N, Ditangco R, et al. The TREAT...