Single-particle aerosol mass spectrometry for the detection and identification of chemical warfare agent simulants

Single-particle aerosol mass spectrometry (SPAMS) was used for the real-time detection of liquid nerve agent simulants. A total of 1000 dual-polarity time-of-flight mass spectra were obtained for micrometer-sized single particles each of dimethyl methyl phosphonate, diethyl ethyl phosphonate, diethyl phosphoramidate, and diethyl phthalate using laser fluences between 0.58 and 7.83 nJ/microm2, and mass spectral variation with laser fluence was studied. The mass spectra obtained allowed identification of single particles of the chemical warfare agent (CWA) simulants at each laser fluence used although lower laser fluences allowed more facile identification. SPAMS is presented as a promising real-time detection system for the presence of CWAs.     

MRI-based quantification of ophthalmic changes in healthy volunteers during acute 15° head-down tilt as an analogue to microgravity

Spaceflight is known to cause ophthalmic changes in a condition known as spaceflight-associated neuro-ocular syndrome (SANS). It is hypothesized that SANS is caused by cephalad fluid shifts and potentially mild elevation of intracranial pressure (ICP) in microgravity. Head-down tilt (HDT) studies are a ground-based spaceflight analogue to create cephalad fluid shifts. Here, we developed non-invasive magnetic resonance imaging (MRI)-based techniques to quantify ophthalmic structural changes under acute 15° HDT. We specifically quantified: (i) change in optic nerve sheath (ONS) and optic nerve (ON) cross-sectional area, (ii) change in ON deviation, an indicator of ON tortuosity, (iii) change in vitreous chamber depth, and (iv) an estimated ONS Young''s modulus. Under acute HDT, ONS cross-sectional area increased by 4.04 mm² (95% CI 2.88–5.21 mm², p < 0. 000), while ON cross-sectional area remained nearly unchanged (95% CI −0.12 to 0.43 mm², p = 0.271). ON deviation increased under HDT by 0.20 mm (95% CI 0.08–0.33 mm, p = 0.002). Vitreous chamber depth decreased under HDT by −0.11 mm (95% CI −0.21 to −0.03 mm, p = 0.009). ONS Young''s modulus was estimated to be 85.0 kPa. We observed a significant effect of sex and BMI on ONS parameters, of interest since they are known risk factors for idiopathic intracranial hypertension. The tools developed herein will be useful for future analyses of ON changes in various conditions.     

Social connectedness and mothering: Effects of maternal employment and maternal absence.

We conducted two separate studies to test N. Chodorow's (1978) theory concerning the relationship between mothering and social connectedness, that is, a sense of self in relation to others. In two correlational studies, we examined the effects of maternal employment and maternal absence (because of death or divorce) on young adults' social connectedness, as measured by the Interpersonal Orientation (IO) Scale (W. C. Swap and J. Z. Rubin; see record 1983-22471-001). Although differences in maternal employment were not related to IO, maternal absence was related to IO. Daughters whose mothers had been absent since the daughters' early childhood rated themselves lowest on IO; this was especially true of daughters who did not report having a mother substitute. This finding provides support for Chodorow's theory because it documents a predicted sex difference, a predicted effect of "mothering" versus "fathering," and a predicted difference between early (i.e., preoedipal) and later absence. Future empirical work on moderators of child-rearing experience is warranted. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of number signals on reading and recall.

Examined the influence of number signals (i.e., numbers or number words preceding important textual information) on text recall. 120 undergraduates read and recalled 2 texts containing 10 target sentences each. Reading times were recorded for each target sentence. For half of the Ss, the target sentences were preceded by numbers indicating their organization; for the other half, the target sentences were not signaled. Half of the Ss completed a free-recall task, while the remainder completed a cued-recall task. Results indicate that Ss read target sentences more slowly if they were signaled than if they were unsignaled. Ss' recalls of target information followed the text organization more closely if the sentences were signaled. Signaling aided free recall of target sentences, but had no effect on cued recall. Results demonstrate that number signals directed attention to the sentences they marked, led to better encoding of the organization of target information, and influenced the process of recalling the target information. (33 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dietary restraint: A theoretical and empirical review.

Examines 2 basic hypotheses concerning dietary restraint. One hypothesis focuses on disinhibition or loss of control among dieters, and the other focuses on the relations between obesity and restraint. It is concluded that the disinhibition hypothesis, which proposes that dieters overeat after disruptions in self-control, has been supported. Both perceptions of having overeaten and dysphoric mood precipitate high consumption among restrained eaters. Research is needed to establish the processes underlying these effects. It is also concluded that the obesity and restraint hypothesis, which proposes that differences in level of restraint underlie differences between obese and normal weight people's eating patterns, has not been supported. Although obese people have higher average restraint scores than normal weight people do, they do not show the disinhibited eating patterns that characterize normal weight, restrained eaters. Studies of the restraint scale have indicated that the high scores found among obese people may be due to psychometric problems in the scale. Overall, it is concluded that although the hypotheses concerning restraint and the recent extension of them into a boundary model of food regulation do not seem useful in understanding obesity, they appear to be relevant to understanding binge eating and related disorders such as bulimia. (77 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Perceptions of counselor supervision: An examination of Stoltenberg's model from the perspectives of supervisor and supervisee.

We used Stoltenberg's (1981) developmental model of counselor supervision in an examination of relational consequences of supervisors' and supervisees' disagreements about a supervisee's counseling sophistication. We also sought support for Stoltenberg's proposed optimal supervision environments. Eighty-seven supervisors and 77 supervisees from 31 randomly selected university counseling and clinical psychology programs around the United States categorized supervisees as belonging to one of four developmental levels. They also provided demographic information, estimated supervisory behavior frequencies, and made satisfaction and impact ratings. Results indicated that (a) supervisors perceived themselves as varying their behavior with supervisees of different developmental levels in a manner that accorded with Stoltenberg's model, (b) supervisees did not perceive the differences reported in supervisors' behaviors, and (c) supervisees reported significantly less satisfaction and impact when they were in mismatched pairs with supervisors, although supervisors did not. In subsequent analyses, we found that supervisees preferred supervision that was characterized by a collegial relation with a focus on trainee personal development and self-understanding. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reasons for conversion to Islam among women in the United States.

Nine reported reasons for converting to Islam were quantitatively assessed regarding prevalence and importance among 304 women in the United States. The appeal of Muslim moral values and dissatisfaction with one’s former faith were primary reasons, followed closely by enhanced sense of identity and alignment with cultural views (regarding ethnic diversity and gender roles). Active (theological and personal) reasons for conversion were more important and prevalent than passive (social) reasons. Qualitative analyses of additional write-in responses suggested four other reasons for conversion, including the appeal of Muslim tenets and an increased sense of significance/meaning. Findings are discussed in terms of implications for future research. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Semantic contextual cuing and visual attention.

Since M. M. Chun and Y. Jiang's (1998) original study, a large body of research based on the contextual cuing paradigm has shown that the visuocognitive system is capable of capturing certain regularities in the environment in an implicit way. The present study investigated whether regularities based on the semantic category membership of the context can be learned implicitly and whether that learning depends on attention. The contextual cuing paradigm was used with lexical displays in which the semantic category of the contextual words either did or did not predict the target location. Experiments 1 and 2 revealed that implicit contextual cuing effects can be extended to semantic category regularities. Experiments 3 and 4 indicated an implicit contextual cuing effect when the predictive context appeared in an attended color but not when the predictive context appeared in an ignored color. However, when the previously ignored context suddenly became attended, it immediately facilitated performance. In contrast, when the previously attended context suddenly became ignored, no benefit was observed. Results suggest that the expression of implicit semantic knowledge depends on attention but that latent learning can nevertheless take place outside the attentional field. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Requirements-oriented methodology for evaluating ontologies

Many applications benefit from the use of a suitable ontology but it can be difficult to determine which ontology is best suited to a particular application. Although ontology evaluation techniques are improving as more measures and methodologies are proposed, the literature contains few specific examples of cohesive evaluation activity that links ontologies, applications and their requirements, and measures and methodologies. In this paper, we present ROMEO, a requirements-oriented methodology for evaluating ontologies, and apply it to the task of evaluating the suitability of some general ontologies (variants of sub-domains of the Wikipedia category structure) for supporting browsing in Wikipedia. The ROMEO methodology identifies requirements that an ontology must satisfy, and maps these requirements to evaluation measures. We validate part of this mapping with a task-based evaluation method involving users, and report on our findings from this user study.