Strange nonchaotic attractors (SNA) arise in quasiperiodically driven systems in the neighborhood of a saddle node bifurcation whereby a strange attractor is replaced by a periodic (torus) attractor. This transition is accompanied by Type-I intermittency. The largest nontrivial Lyapunov exponent Λ is a good order–parameter for this route from chaos to SNA to periodic motion: the signature is di...

OBJECTIVE This report describes the outcomes of a social networking approach (SNA) in a heterosexually transmitted syphilis epidemic by street nurses in British Columbia, Canada. METHODS Street nurses used SNA interviewing cues, environmental observation, peer outreach, serial interviewing, conducted blood tests, and offered treatment on the street. Rates of cases of syphilis identified by ou...

PURPOSE Social network analysis (SNA) provides a way of quantitatively analyzing relationships among people or other information-processing agents. Using 2 practices as illustrations, we describe how SNA can be used to characterize and compare communication patterns in primary care practices. METHODS Based on data from ethnographic field notes, we constructed matrices identifying how practice...

The production of goods and services by households can be split into production intended to be sold or exchanged (market production) and that to be consumed by the household itself or given free of charge to another party (non-market production). The former is within the ambit of the System of National Accounts (SNA)3 economic production boundary (para. 6.18 (a)) and called ‘SNA market producti...

Studying networked learning (NL) by applying social network analysis (SNA), has gained popularity in recent years. However, it appears that in the context of networked learning the choice of SNA indices is very often dictated by using easily achievable SNA tools. Most studies in this field only involve a single group of students and utilize simple indices, such as density and Freeman's degree c...

single-minded (sim) is a master regulatory gene that directs differentiation in the central nervous system during Drosophila embryogenesis. Recent identification of the mesectoderm enhancer (MSE) of sim has led to the hypothesis that two Snail (Sna)-binding sites in the MSE may repress sim expression in the presumptive mesoderm. We provide evidence here that three Sna-binding sites proximal to ...

BACKGROUND Heart failure with preserved left ventricular ejection fraction (HFPEF) affects about half of all patients diagnosed with heart failure. The pathophysiological aspect of this complex disease state has been extensively explored, yet it is still not fully understood. Since the sympathetic nervous system is related to the development of systolic HF, we hypothesized that an increased sym...

Excess dietary salt intake contributes to or exacerbates some forms of hypertension by increasing sympathetic nerve activity (SNA) and arterial blood pressure (ABP) through angiotensin II (Ang II) type 1 receptor activation in the rostral ventrolateral medulla (RVLM). Despite this interaction among dietary salt, Ang II, and the RVLM, no studies have directly examined whether dietary salt by its...

Social network analysis (SNA) has much to offer sociology. However, there is little consideration of SNA in contemporary sociological theory (CST) although SNA developed in parallel with the consolidation of CST in the 1960s and 1970s. SNA championed its distinctiveness as ‘structural analysis’. Nearly all current CST presents ‘structure versus agency’ as the crucial binary to differentiate mai...

Sympathetic nervous system activity is increased in several cardiovascular diseases, including hypertension and heart failure (HF).1 Indeed, one classification of the severity of HF is based on the direct relationship between the plasma concentration of the sympathetic neurotransmitter, norepinephrine, and impaired cardiac function.1 Although the role of increased sympathetic nerve activity (SN...