The Influence of Survival Context and Psychological Markers on Recall.

Introduction: Research shows that stimuli rated for their relevance to a survival scenario have a higher recall probability when compared to other deep encoding conditions. This phenomenon, known as survival memory advantage, is a robust finding that has been demonstrated by various experimental manipulations. The current study aimed to examine associations between participants' psychological markers (perceived stress, anxiety, coping, cognitive control, and flexibility) and their memory performance in survival and other encoding conditions (fight, flight, and pleasantness).

Voltammetric and impedimetric DNA detection at single-use graphite electrodes modified with gold nanorods.

In this study, single-use pencil graphite electrodes (PGEs) were modified by gold nanorods (AuNRs) and then single stranded oligonucleotide probe molecules (ssODNs) were immobilized onto the surface of AuNRs modified PGE. The electrochemical characterizations using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques were firstly performed to present the successfull modification of AuNR onto PGE surface. Under the optimum experimental conditions based on enhanced sensor response, single stranded thiol linked DNA probe ssODNs was immobilized onto AuNR modified PGE and accordingly, a sequence-selective DNA hybridization related to Hepatitis B virus (HBV) DNA was performed at the surface of AuNR modified electrodes.

Chemical guiding of magnetic nanoparticles in dispersed media containing poly-(methylmethacrylate-co-vinylpyrrolidone).

The differential reactivity of methylmethacrylate (MMA) and vinylpyrrolidone (VP) in free radical copolymerization, with stirring in methanol, renders an emulsified two phase system. The dispersed and continuous liquid phases contain copolymers rich in MMA and VP, respectively. When Fe(3)O(4) magnetic nanoparticles (mNPs) stabilized with tetramethylammonium hydroxide are added to this emulsion, the mNPs are located in the continuous phase.

Synthesis and characterization of nanomagnetite particles and their polymer coated forms.

Superparamagnetic nanoparticles were prepared by coprecipitation of ferrous (Fe(2+)) and ferric (Fe(3+)) aqueous solution by a base. Nanomagnetite particles were coated with poly(St/PEG-EEM/DMAPM) and poly(St/PEG-MA/DMAPM) layer by emulsifier-free emulsion polymerization. Chemical structure of nanoparticles was characterized by both FTIR and (1)H NMR.

Stepwise formation approach to improve ellipsometric biosensor response.

In this article we report a technique for improved response of ellipsometric sensors by means of self-assembling molecules and gold nanoparticles (AuNPs). First, we have examined the effects of dipping time and solution concentration on formation of 3-aminopropyltriethoxysilane molecules on glass surfaces. All of the surfaces were characterized by atomic force microscopy, imaging ellipsometry, and contact angle goniometer.