Needle in a haystack catalysis

A new configuration of catalyst loading in the Temporal Analysis of Products (TAP) reactor is presented. It is a single Pt particle packed in a bed with approximately 100,000 inert quartz particles. In TAP studies, the single particle configuration was proven to be sensitive enough to monitor and compare kinetic characteristics of the same catalyst particle at both high vacuum and atmospheric pressures. Catalytic CO oxidation reaction over platinum was used to illustrate these new possibilities. In the TAP single particle experiments under high vacuum conditions, a single particle provides high conversion (up to a total conversion of 95%) despite the catalyst particle occupies less than 0.1% of the total reactor volume. This phenomenon was proven in a variety of pulse response experiments. A mathematical probabilistic theory of this counterintuitive phenomenon will be published in the next paper. Also, an interesting similarity was found from both TAP vacuum and atmospheric pressure data, i.e. both sets of data are characterized by a “turning point” at the same temperature of 170 °C indicating a transition from an O₂ dominated regime to a CO dominated regime. This observation of pressure independent characteristic of the Pt particle creates a new possibility for bridging across the pressure gap.     

Assessing disharmony and disaffection in intimate relationships: Revision of the Marital Satisfaction Inventory factor scales.

Previous research has identified 2 broad components of distress in intimate relationships: overt conflict, or disharmony, and emotional distance, or disaffection. Using confirmatory factor analysis, the authors derived 2 broadband scales of disharmony and disaffection from the Marital Satisfaction Inventory-Revised (D. K. Snyder, 1997), building upon previous measures of these constructs (D. K. Snyder & Regts, 1982) derived from the original instrument. The new scales demonstrated high internal consistency and test-retest reliability, as well as discriminative validity and convergent validity with independent criteria of relationship functioning. Distinct distributions of these scales in community and clinical samples suggested their complementary role in research on intimate relationships and assessment of couples in treatment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Questioning additional claims about the false memory syndrome epidemic.

In this comment on the article by K. S. Pope (see record 83-37387), the authors agree about the need to evaluate the empirical evidence regarding the alleged epidemic of false memories and accusations of abuse. The authors also express an additional concern that the data presented to support claims of false memory syndrome proponents are frequently extreme misapplications of published research. Examples of such misrepresentations are presented and discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effects of child sexual abuse: Comment on Rind, Tromovitch, and Bauserman (1998).

Comments on the article by B. Rind, P. Tromovitch, and R. Bauserman (see record 1998-04232-002) which examined the long-term effects of childhood sexual abuse (CSA) by meta-analyzing studies of college students. The authors reported that effects "were neither pervasive nor typically intense" and that "men reacted much less negatively than women" (p. 22) and recommended value-neutral reconceptualization of the CSA construct. The current analysis revealed numerous problems in that study that minimized CSA-adjustment relations, included use of a healthy sample, an inclusive definition of CSA, failure to correct for statistical attenuation, and misreporting of original data. Rind et al.'s study's main conclusions were not supported by the original data. As such, attempts to use their study to argue that an individual has not been harmed by sexual abuse constitute a serious misapplication of its findings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

"Remembering" words not presented in lists: relevance to the current recovered/false memory controversy

H.L. Roediger and K.B. McDermott (1995) found that when participants studied a list of words with a common but not presented associate, participants frequently falsely reported remembering the never presented associated word as part of the list. Roediger and McDermott suggest that this finding is generalizable to the current controversy surrounding contested memories of child abuse. The present authors urge caution in making such a generalization, arguing that there are critical differences between Roediger and McDermott's findings and contested memories of abuse.     

Techniques for Fabricating Nanoscale Catalytic Circuits

This paper describes the development of a new technique, atomic beam deposition (ABD), for the fabrication of catalysts with different active sites capable of catalyzing different chemical reactions. Using ABD, submonolayer amounts of Te and Cu atoms were deposited on vanadyl pyrophosphate (VPO) catalyst particles, and precise non-steady-state kinetic characterization was performed using the temporal analysis of products (TAP) reactor immediately following deposition. Results from TAP Knudsen pulse response experiments determine if small changes in the metal surface composition would produce detectable changes in catalytic properties. Partial oxidation of 1-butene to furan was used as the test reaction. Furthermore, this paper also demonstrates the sensitivity of the TAP reactor by measuring oxygen uptake on a single 350 μm diameter polycrystalline Pt particle packed in a bed with 100,000 inert quartz particles of similar dimensions. The Pt experiments demonstrate the precise manipulation of surface oxygen content.     

A general formula for reactant conversion over a single catalyst particle in TAP pulse experiments

We obtain a general formula for reactant conversion in diffusion-reaction TAP systems over single non-porous catalyst particles as a product of two terms: α=P_H×K.The first term, P_H, is a purely geometric factor dependent only on the shape of the reactor and the shape and position of the catalyst particle, interpreted as the probability that an individual molecule of reactant will hit the catalyst before leaving the reactor. The second term, K=kτ_H/(1+kτ_H), is a geometrical/chemical term involving the kinetic constant k and a transport characteristic (residence time in the catalyst zone, τ_H). Both P_H and τ_H can be effectively calculated for any given reactor-particle configuration. Our formula greatly extends the validity of a formula given in Shekhtman et al. [1999. Thin-zone TAP-reactor—theory and application. Chem. Eng. Sci. 54, 4371-4378] for thin-zone TAP-systems. It is derived by a probabilistic analysis of the residence time of individual molecular trajectories in chemically active regions. Our results are based on the theory previously developed in our paper [Feres, R., Yablonsky, G.S., Mueller, A., Baernstein, A., Zheng, X., Gleaves, J., 2009. Probabilistic analysis of transport-reaction processes over catalytic particles: theory and experimental testing. Chem. Eng. Sci. 64, 568-581].     

Corroborating premorbid dissociative symptomatology in dissociative identity disorder.

Clinicians are often cautious about making the diagnosis of Dissociative Identity Disorder (DID). The existence of corroborating evidence that symptoms of DID existed prior to assessment may address concerns about the genuineness of individual cases. The authors report the results of a survey of clinicians to determine the frequency of corroboration that clients' DID symptoms existed prior to being diagnosed or prior to therapy. On the basis of 446 cases of DID, clinicians reported some form of corroboration (e.g., reports from family, medical records) in 73% of cases for symptoms prior to diagnosis and in 67% of cases for symptoms prior to therapy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Confirmatory factor analysis of a multidimensional model of bulimia nervosa.

In a recent investigation of the psychopathology of bulimia nervosa by D. L. Tobin et al (1991), a multidimensional model for bulimia nervosa was presented, based on the results of an exploratory factor analysis. In the present investigation, these results and the multidimensional model were tested by means of confirmatory factor analysis with 100 women diagnosed as having bulimia nervosa. The results not only support the multidimensional model with the higher order dimensions Affective and Personality Disorder, Bulimic Behaviors, and Restricting Behaviors, but also demonstrate the importance of body dissatisfaction as a significant, and possibly independent, component of bulimia nervosa. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Recent reformulations of Freud's development and abandonment of his seduction theory: Historical/scientific clarification or a continued assault on truth?

It is well known that, as part of Freud's early work with "hysteria," he reported making discoveries of sexual abuse that he interpreted first as genuine but subsequently as fantasy. Several writers now argue that Freud never made such discoveries; rather that he lied about them, only inferred abuse from his patients' symptoms, or suggested false memories to his clients. The present authors evaluate Freud's original work and these recent claims and conclude that (a) they are not new and are similar to the original reaction that Freud received; (b) the assertion that Freud did not make discoveries of abuse is unwarranted; and (c) these recent writers frequently have supported their positions by misrepresenting what Freud actually wrote, ignoring evidence that contradicted their position, failing to consider obvious and more plausible explanations for Freud's behavior, and going beyond the available data and stating with certainty what cannot be determined. (PsycINFO Database Record (c) 2010 APA, all rights reserved)