Phenotype change in hyperlipoproteinemias

The spontaneous and the induced change of phenotype makes the correct interpretation of disturbance of fat metabolism on the base of phenotypization by Fredrickson more difficult. This is underlined by the present international practice to divide disturbances of fat metabolism for the time by increased lipids into hypercholesterinaemiae, hypertriglyceridaemiae and hypertriglyceride-hypercholesterinaemiae. The common trend, however, aims at characterization of disturbances of fat metabolism by changes of apoproteins.     

Cross-correlations between volume change and price change

In finance, one usually deals not with prices but with growth rates R, defined as the difference in logarithm between two consecutive prices. Here we consider not the trading volume, but rather the volume growth rate $\tilde{R}$, the difference in logarithm between two consecutive values of trading volume. To this end, we use several methods to analyze the properties of volume changes |$\tilde{R}$|, and their relationship to price changes |R|. We analyze 14,981 daily recordings of the Standard and Poor''s (S & P) 500 Index over the 59-year period 1950–2009, and find power-law cross-correlations between |R| and |$\tilde{R}$| by using detrended cross-correlation analysis (DCCA). We introduce a joint stochastic process that models these cross-correlations. Motivated by the relationship between |R| and |$\tilde{R}$|, we estimate the tail exponent $\tilde{\alpha }$ of the probability density function P(|$\tilde{R}$|) ∼ |$\tilde{R}$|^{−1−$\tilde{\alpha }$} for both the S & P 500 Index as well as the collection of 1819 constituents of the New York Stock Exchange Composite Index on 17 July 2009. As a new method to estimate $\tilde{\alpha }$, we calculate the time intervals τ_q between events where $\tilde{R}$ > q. We demonstrate that $\tilde{\tau }$_q, the average of τ_q, obeys $\tilde{\tau }$_q ∼ q^{$\tilde{\alpha }$}. We find $\tilde{\alpha }$ ≈ 3. Furthermore, by aggregating all τ_q values of 28 global financial indices, we also observe an approximate inverse cubic law.     

Behavioral change in preventive medicine

We designed and evaluated a program to teach internal medicine residents behavioral counseling skills for multiple risk factor modification. Integrating physician-patient communication, negotiation skills, and the transtheoretical model of behavior change, we used small group discussion and standardized patients. The 18 participating residents increased their ability to modify patient behavior during videotaped interviews, mean pretest/posttest score: 33.1/40.1 (Student’s pairedt test, p<.0001). Physician self-efficacy in screening for risk factors and effecting behavioral change in patients was increased (p<.0001), as were positive attitudes toward psychosocial factors (p<.003). Our teaching effectively increased the residents’ self-efficacy and performance of behavioral counseling.     

Expert credibility in climate change

Although preliminary estimates from published literature and expert surveys suggest striking agreement among climate scientists on the tenets of anthropogenic climate change (ACC), the American public expresses substantial doubt about both the anthropogenic cause and the level of scientific agreement underpinning ACC. A broad analysis of the climate scientist community itself, the distribution of credibility of dissenting researchers relative to agreeing researchers, and the level of agreement among top climate experts has not been conducted and would inform future ACC discussions. Here, we use an extensive dataset of 1,372 climate researchers and their publication and citation data to show that (i) 97–98% of the climate researchers most actively publishing in the field surveyed here support the tenets of ACC outlined by the Intergovernmental Panel on Climate Change, and (ii) the relative climate expertise and scientific prominence of the researchers unconvinced of ACC are substantially below that of the convinced researchers.     

Epigenetic change in pituitary tumorigenesis

Throughout the genome CpG dinucleotides are found at one-fifth of their expected frequency and their rarity is further marked by the fact that 70% are methylated. In contrast, CpG islands (CGI), found associated with the promoters of many genes, have maintained their expected frequency of this dinucleotide, and remain unmethylated. Inappropriate methylation of CGIs is associated with histone deacetylation and gene silencing, while methylation of CpGs outside of CGIs is associated with significantly higher mutation rates. Methylation of CGIs is a frequent event in numerous tumour types including those that arise within the pituitary gland. Several studies now show highly frequent methylation of the p16 gene that is significantly associated with loss of cognate protein and that appears to be an early change in pituitary tumorigenesis. Collectively, studies show that somatotrophinomas are an infrequent target for p16 CGI methylation. However, in this pituitary tumour subtype, loss of pRb is associated with either CGI methylation or micro-deletion within the protein-pocket binding domain. As in other tumour types loss of p16 or RB1 appear to be mutually exclusive events in non-functional adenomas and somatotrophinomas respectively. Investigation of the Death Associated Protein Kinase gene shows that loss of its protein (DAPK), a pro-apoptotic molecule, in pituitary tumours is also associated with either methylation or deletion within its associated CGI. In the case of DAPK, however, these changes segregate with invasive pituitary tumours irrespective of tumour subtype. Methylation represents a positive signal that can be detected with exquisite sensitivity; in addition, this change targets multiple genes that show tumour type specificity. Taken together, the detection of DNA methylation changes, using either a panel of predefined marker-islands, or CGI arrays, provides the opportunity to generate "methylation profiles". This new knowledge will increase our understanding of tumour biology and could ultimately aid medical management in these different tumour types, including those of pituitary origin.     

Motivation to change in adolescents with bulimia nervosa mediates clinical change after treatment

Several studies have related motivation to change and treatment response in adult patients with bulimia nervosa but there are no longitudinal studies analysing this relationship in adolescents. The objective was to determine whether motivation to change is related to clinical improvement after treatment in adolescent patients with bulimia nervosa. The Bulimia Nervosa Stages of Change Questionnaire, the Eating Disorders Inventory (EDI‐2) and the Beck Depression Inventory (BDI) were administered at the beginning of treatment to 40 adolescent patients with bulimia nervosa (DSM‐IV) (mean age = 16.2 years). Thirty‐one patients were re‐assessed after 6 months of treatment. The majority of clinical and psychological variables improved significantly at the second evaluation. There were significant correlations between initial motivation to change and improvement in number of binges and the EDI‐2 scales of Bulimia and Interoceptive Awareness. In the stepwise multiple linear regression analysis, which included initial motivation to change and other potential confounding variables such as age, BDI, duration of disorder and body mass index, only motivation to change was selected as a predictor of improvement in number of binges (standardized β coefficient = 0.45; p = 0.012) and of decrease on the Bulimia scale (standardized β coefficient = 0.43; p = 0.029). Regarding improvement in Interoceptive Awareness, only the BDI score was selected as an independent predictor (β coefficient = 0.58; p = 0.002). In conclusion, in adolescent patients receiving treatment for bulimia nervosa, improvement in bulimic symptomatology seems to be especially related to initial motivation to change. Copyright © 2010 John Wiley & Sons, Ltd and Eating Disorders Association.     

Weight change is associated with change in arterial stiffness among healthy young adults

Risk factors for arterial stiffness progression have not been well characterized. We examined the relationship between arterial stiffness progression and body weight and weight gain in a group of healthy young adults. Aortic pulse-wave velocity was assessed at 2 time points approximately 2 years apart in 152 white and black adults aged 20 to 40 years, and was standardized by the time between visits to obtain annualized pulse-wave velocity changes. Blacks had 15.5 cm/s per year larger annual pulse-wave velocity increases compared with whites (P=0.02), even after multivariable adjustment for weight and blood pressure changes. Larger annual pulse-wave velocity increases were also associated with larger baseline body weight (P=0.02), waist girth (P=0.003), and body mass index (P<0.001), and greater annual weight gain (P=0.02), after adjustment for baseline pulse-wave velocity. After multivariable adjustment that included blood pressure changes, larger baseline waist girth (P=0.009), baseline body mass index (P=0.001), body mass index increase (P=0.037), and weight gain (P=0.017) remained significantly associated with larger annual pulse-wave velocity progression. Weight change showed a direct relationship with pulse-wave velocity change; mean annual pulse-wave velocity changes were -29.9 cm/s per year (regression) for those with >or=4.5 kg annual weight loss and 18.2 cm/s per year (progression) for those with >or=4.5 kg annual weight gain. These data show strong associations between weight gain and arterial stiffness progression, as well as between weight loss and arterial stiffness regression. These data greatly underscore the vascular benefit of weight loss. Successful weight loss programs in young adults, particularly blacks, are needed.     

Concordance of proxy-perceived change and measured change in multiple domains of function in older persons

OBJECTIVES: To compare proxy perceptions about change over 6 months in physical, instrumental, affective, and cognitive functioning of older persons with computed change in patient self-report and performance and patient's own perceptions about change. DESIGN: Prospective study. SETTING: Recovery from hip fracture that occurred in community-dwelling persons in Baltimore, Maryland, in 1990-91. The recovery from the sixth to the 12th month postfracture was observed. PARTICIPANTS: One hundred forty-one hip fracture patients aged 65 and older and a self-designated proxy for each. MEASUREMENTS: For specific tasks of physical and instrumental functioning, proxy perception of change over the previous 6 months asked in the 12th month postfracture was compared with change in criterion measures (subject self-report and observed performance) from the sixth to the 12th month postfracture. For global change over the previous 6 months in each area of functioning, proxy perception was compared with the subject's own perception in the 12th month postfracture. RESULTS: Agreement between proxy perceptions of change and change in criterion measures was poor. There was a general pattern for proxies to overstate improvement and understate deterioration in comparison with change observed in criterion measures for specific tasks of physical and instrumental functioning. Proxies' global perceptions reported subjects improving less and deteriorating more than patients' own perceptions. CONCLUSION: Proxy perceptions about task-specific and global changes in subjects' functional health over a short period of time are systematically different from patient report and observed performance.     

Applying behavior change models to understand spiritual mechanisms underlying change in substance abuse treatment

Despite increasing attention directed to conceptual and methodological issues surrounding spirituality and despite the centrality of "spiritual transformation" in the recovery literature, there is little systematic evidence to support the role of spiritual change as a necessary condition for substance abuse behavior change. As an explicit conceptualization of mechanisms underlying behavior change is fundamental to effective interventions, this article: 1) briefly reviews relevant behavior change theories to identify key variables underlying change; 2) presents an integrative conceptual framework articulating linkages between program components, behavior change processes, spiritual change mechanisms and substance abuse outcomes; and 3) presents a discussion of how the mechanisms identified in our model can be seen in commonly used substance abuse interventions. Overall, we argue that spiritual transformation at an individual level takes place in a social context involving peer influence, role modeling, and social reinforcement.