Clarifying and Extending the Construct of Adult Resilience.

In this article the author responds to comments made in this issue (see records 2005-03019-010; 2005-03019-011; 2005-03019-012; 2005-03019-013; and 2005-03019-014) responding to his original article entitled Loss, trauma, and human resilience: Have we underestimated the human capacity to thrive after extremely aversive events? (see record 2004-10043-003). The author notes that in his original article he focused on three crucial points: Resilience among adults represents a distinct and empirically separable outcome trajectory from that normally associated with recovery from trauma; resilience is more prevalent than generally accepted in either the lay or professional literature; and there are multiple and sometimes unexpected factors that inform adult resilience. Owing to the brevity of the article, the author could only touch briefly on many of the more nuanced and complex issues suggested by the resilience construct; this left plenty of room for critique. Fortunately, the comments are generous and insightful and for the most part compatible with the driving goal of the article. As might be expected, of course, there were statements peppered throughout the comments that the author deemed worthy of rebuttal or correction. He considers four points that seemed to beg most urgently for response. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A new purification technique for single-walled carbon nanotubes by interaction with alkali and oxygen

In this work we present a purification technique for oxygen removal from carbon nanotubes (CNTs) at relatively low temperature monitored by X-ray Photoelectron Spectroscopy and electrical characterization (change in resistance). We dope the sample with alkali metal (Na, K and Cs), which successively bind with the residual impurities of oxygen. The removal of the so formed oxides occur by heating the sample at relatively low temperatures (500-600 degrees C) without collateral damage to CNTs mat. In particular we investigate the in situ intercalation of alkali in SWNT followed by oxygen adsorption monitored by DC resistance measurements and X-ray photo-spectroscopy (XPS), demonstrating that the alkali intercalation in the samples trigger the oxygen adsorption. A subsequent sample heating at 500 degrees C removes both oxygen and alkali. Furthermore, the amount of the oxygen removal depends upon the deposited alkali species: in effect only with Na and K we obtain a complete oxygen removal, while other alkalis probably do not intercalate properly inside the nanotube walls. We hypothesize that the atomic radius of alkali can affect the intercalation properties of them inside the CNT structure.     

Human brain cholecystokinin: release of cholecystokinin-like immunoreactivity (CCK-LI) from isolated cortical nerve endings and its modulation through GABA(B) receptors

The release of cholecystokinin-like immunoreactivity (CCK-LI) in human brain was investigated using synaptosomes prepared from neocortical specimens removed during neurosurgery. CCK-LI basal release from superfused synaptosomes was increased 3 to 4-fold during depolarization with 15 mM KCI. The K(+)-evoked overflow of CCK-LI was strictly Ca(++)-dependent. The gamma-aminobutyric acidB (GABA(B)) receptor agonist (-)baclofen (0.3-100 microM) inhibited CCK-LI overflow in a concentration-dependent manner (EC50 = 2.20 microM; maximal effect: 45%). The novel GABA(B) receptor ligand CGP 47656 mimicked (-)baclofen (EC50 = 2.45 microM; maximal effect: 50%), whereas the GABA(A) agonist muscimol was ineffective up to 100 microM. The inhibitory effect of 10 microM (-)baclofen on the CCK-LI overflow was concentration-dependently prevented by two selective GABA(B) receptor antagonists, CGP 35348 (IC50 = 13.91 microM) and CGP 52432 (IC50 = 0.08 microM). The effect of 10 microM CGP 47656 was abolished by 1 microM CGP 52432. In experiments on [3H]GABA release, CGP 47656 behaved as an antagonist at the GABA(B) autoreceptors: added at 10 microM, it prevented the inhibitory effect of 10 microM (-)baclofen on the K+ (15 mM)-evoked release of [3H]GABA from human synaptosomes. We conclude that 1) the release of CCK-LI evoked from human brain tissue appears of neuronal origin; 2) the CCK-releasing terminal possess inhibitory presynaptic GABA(B) receptors; 3) these receptors differ pharmacologically from human neocortex GABA(B) autoreceptors, which are CGP 35348-insensitive (Fassio et al., 1994) but can be blocked by CGP 47656; 4) because cholecystokinin has been implicated in anxiety, the GABA(B) receptors here characterized may represent targets for novel anxiolytic agents.     

LCA of strippable coatings and of steam vacuum technology used for nuclear plants decontamination

The application of strippable coatings is an innovative technology for decontamination of nuclear plants and for any decontamination project aiming at removing surface contamination. An adhesive plastic coating is applied on the contaminated surface. The strippable coating is allowed to cure for up to 24 h, after which it can be easily peeled. The coating traps the contaminants in the polymer matrix. Strippable coatings are non-toxic and do not contain volatile compounds or heavy metals. Since the coating constitutes a solid waste, disposal is easier than treating contaminated liquid wastes, produced by the baseline technology: steam vacuum cleaning, based upon superheated pressurized water in order to remove contaminants from floors and walls. A life cycle assessment (LCA) has been carried out with the purpose of comparing the strippable coating with the steam vacuum technology. The functional unit of the study is represented by a surface of 1 m² to be decontaminated. The results of LCA achieved using Sima Pro 5.0^® software confirm the good environmental performances of strippable coatings. Taking into account both LCA and environmental costs for liquid wastes, the advantages of strippable coatings will be more and more evident.     

Trait self-enhancement as a buffer against potentially traumatic events: A prospective study.

Longitudinal research has associated the disposition toward self-enhancing biases with better adjustment following potentially traumatic events (PTEs). However, self-enhancement was always measured in these studies after the PTE, thus confounding it with exposure. This study used a prospective design that tracked PTEs in college students over a 4-year period using an online checklist (n = 69). Most participants experienced at least 1 PTE, and the mean number of PTEs was 4.40. Trait self-enhancement, measured at the beginning of the study and prior to the PTEs, was associated with reduced distress in both the first and fourth year of college. Participants with greater exposure to PTEs had greater distress in their fourth year; however, individuals high in self-enhancement were relatively unaffected by PTE exposure. High self-enhancement participants were also rated as better copers in anonymous ratings obtained from participants' close friends. Overall, these results offer the first prospective evidence demonstrating that self-enhancement serves as a buffer against the potentially harmful effects of trauma. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

What we don't expect when expecting: Evidence for heterogeneity in subjective well-being in response to parenthood.

A recent article in New York Magazine echoed what psychological studies of parenthood have consistently demonstrated since the 1970s: “Most people assume that having children will make them happier. Yet a wide variety of academic research shows that parents are not happier than their childless peers, and in many cases are less so” (Senior, 2010). There is consistent evidence that, as opposed to other life events that cause transient disruptions in life satisfaction, becoming a parent appears to cause harm to individual subjective well-being (Twenge, Campbell, & Foster, 2003), and that this harm is sustained over time (Clark, Diener, Georgellis, & Lucas, 2008). The current investigation was predicated on the concern that these findings may be the result of the methodology used to examine them. As the experience of parenthood does not represent a unified phenomenon, we employed a methodological approach that allows for the exploration of heterogeneity as well as its predictors. By modeling heterogeneous trajectories within a prospective design from 4 years prior to 4 years after the birth of a parent's first child, we find that the majority of individuals (84.2%) demonstrate no long-term effects on life satisfaction in response to childbirth. Only a small percentage demonstrate the sustained declines (7.2%), and a significant cohort, previously unobserved in the literature, demonstrate dramatic and sustained improvements in response to parenthood (4.3%), providing compelling evidence for heterogeneity in life satisfaction among parents. Key demographic covariates that distinguish between trajectories of response are also explored. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Retrospective memory bias for the frequency of potentially traumatic events: A prospective study.

We conducted a prospective study that tracked the frequency of potentially traumatic events (PTEs) and nontraumatic events among college students over a 4-year period using a weekly web-based survey. At the study's completion, participants attempted to recall the number of events they had endorsed on the web surveys. Although participants underrecalled the frequency of all types of life events, recollection was more accurate for PTEs than for non-PTEs. Recalled-frequency of PTEs was associated positively with distress at recall and inversely with trait self-enhancement. These effects were qualified by a distress × self-enhancement interaction. High distress at recall was associated with a greater recalled-frequency of PTEs, but only for people low in trait self-enhancement. (PsycINFO Database Record (c) 2011 APA, all rights reserved)