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The positive semidefinite zero forcing number Z + (G) of a graph G was introduced in [4]. We establish 1 a variety of properties of Z + (G): Any vertex of G can be in a minimum positive semidefinite zero forcing set (this 2 is not true for standard zero forcing). The graph parameters tw(G) (tree-width), Z + (G), and Z(G) (standard zero 3 forcing number) all(More)
Between 1968 and 1974, azathioprine has been used in a controlled prospective trial to treat patients with symptomatic but precirrhotic primary cirrhosis. Forty-five patients were admitted, of whom 22 were given azathioprine in a dose of 2 mg per kg of body weight. During the 1st year, serum aspartate transaminase levels showed a significant change in favor(More)
BACKGROUND The factors influencing the acquisition and prevalence of Helicobacter pylori infection remain incompletely understood. In Russia, the demographic and socioeconomic factors are relatively similar, allowing investigation of risk factors that might not be identifiable in a more diverse population. MATERIALS AND METHODS Sero-prevalence of H.(More)
An abnormal lipoprotein, containing a high proportion of unesterified cholesterol and phospholipid, has previously been described as occurring in the serum of patients with obstructive jaundice, and has been called lipoprotein X. Using an immunoelectrophoretic method for the detection of lipoprotein X in serum, the sera of 97 patients with liver disease(More)
Selective outcome reporting is a form of bias resulting from discrepancies between outcomes presented in a trial's registration and the published report. We investigate this selective bias in obesity clinical trials. A PubMed search was conducted to identify randomized controlled trials (RCTs) published in four obesity journals from 2013 to 2015. Primary,(More)
The positive semidefinite zero forcing number Z + (G) of a graph G was introduced in [4]. We establish 1 a variety of properties of Z + (G): Any vertex of G can be in a minimum positive semidefinite zero forcing set (this 2 is not true for standard zero forcing). The graph parameters tw(G) (tree-width), Z + (G), and Z(G) (standard zero 3 forcing number) all(More)
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