Showing papers by "University of New Mexico published in 1992"

Powerlessness, Empowerment, and Health: Implications for Health Promotion Programs

Abstract: Purpose and Scope. This article reviews the health and social science research relevant to both the role of powerlessness as a risk factor for disease, and the role of empowerment as a health-enhancing strategy. The research literature surveyed includes studies that address these key concepts from the fields of social epidemiology, occupational health, stress research, social psychology, community psychology, social support and networks, community competence and community organizing. Definitions are provided to operationalize these sometimes loosely-applied terms. Important Findings. Powerlessness, or lack of control over destiny, emerges as a broad-based risk factor for disease. Empowerment, though more difficult to evaluate, can also be demonstrated as an important promoter of health. Major Conclusions. Given the importance and currency of these concepts of powerlessness and empowerment, a model of empowerment education is proposed for health-promotion practitioners. Measurement of empowerment ...

Geographic variation in the treatment of localized breast cancer.

Abstract: Background. Breast-conserving surgery followed by radiation therapy is as effective as modified radical mastectomy in treating women with localized breast cancer, as demonstrated by clinical trials reported during the 1980s. The extent to which breast-conserving surgery has been adopted in various regions of the United States is not known. Methods. We assessed variations in the use of breast-conserving surgery from 1983 to 1986 in 18,399 non-Hispanic white, 324 Hispanic, and 1174 black women with breast cancer in nine areas of the United States, using data from the Surveillance, Epidemiology, and End Results Program of the National Cancer Institute. Results. The proportion of white women with localized breast cancer who underwent breast-conserving surgery ranged from 9.2 percent (Iowa) to 32.1 percent (Seattle) in 1983–1984 and from 19.6 percent (Iowa) to 41.5 percent (Seattle) in 1985–1986. Between 1983 and 1986, the use of breast-conserving surgery increased in each area, but the relative ranki...

Cognitive Therapy and Pharmacotherapy for Depression: Singly and in Combination

Abstract: • Cognitive therapy and imipramine hydrochloride tricyclic pharmacotherapy, each singly and in combination, were compared in the treatment of nonpsychotic, nonbipolar depressed outpatients. One hundred seven patients were randomly assigned to 12 weeks of active treatment; 64 patients completed the full course of treatment. Rates of attrition were high but not differential. Cognitive therapy and pharmacotherapy did not differ in terms of symptomatic response, either in the primary analyses or in secondary analyses restricted to more severely depressed outpatients. Initial severity did predict response within pharmacotherapy alone, but not within cognitive therapy. Combining cognitive therapy with pharmacotherapy did not markedly improve response over that observed for either modality alone, although such nonsignificant differences as were evident did favor the combined treatment. Two patients died as a consequence of suicide attempts, both of which involved study medication.

Differential relapse following cognitive therapy and pharmacotherapy for depression.

Abstract: • Patients successfully treated during a 3-month period with either imipramine hydrochloride pharmacotherapy, cognitive therapy, or combined cognitive-pharmacotherapy were monitored during a 2-year posttreatment follow-up period. Half of the patients treated with pharmacotherapy alone continued to receive study medications for the first year of the follow-up. All other patients discontinued treatment at the end of the acute treatment phase. Patients treated with cognitive therapy (either alone or in combination with medication) evidenced less than half the rate of relapse shown by patients in the medication—on continuation condition, and their rate did not differ from that of patients provided with continuation medication. It appears that providing cognitive therapy during acute treatment prevents relapse. Whether this preventive effect extends to recurrence remains to be determined.

Animal movements and population dynamics in heterogeneous landscapes

Abstract: Organisms respond to environmental heterogeneity at different scales and in different ways. These differences are consequences of how the movement characteristics of animals—their movement rates, directionality, turning frequencies, and turning angles—interact with patch and boundary features in landscape mosaics. The interactions of movement patterns with landscape features in turn produce spatial patterns in individual space-use, population dynamics and dispersion, gene flow, and the redistribution of nutrients and other materials. We describe several theoretical approaches for modeling the diffusion, foraging behavior, and population dynamics of animals in heterogeneous landscapes, including: (1) scaling relationships derived from percolation theory and fractal geometry, (2) extensions of traditional patch-based metapopulation models, and (3) individual-based, spatially explicit models governed by local rules. We conclude by emphasizing the need to couple theoretical models with empirical studies and the usefulness of ‘microlandscape’ investigations.

Noninvasive glucose monitoring in diabetic patients: a preliminary evaluation.

Abstract: Noninvasive monitoring of blood/tissue glucose concentrations has been successfully accomplished in individual diabetic subjects by using near-infrared (NIR) spectroscopy coupled with chemometric methods. Three different spectrometer configurations were tested: a) a Fourier-transform infrared spectrometer with an indium antimonide detector; b) a grating monochromator equipped with a silicon (Si) array detector, without fiber optics; and c) a grating monochromator equipped with an Si detector, with fiber-optic sampling. NIR spectra were obtained from diabetic subjects by transmission through the finger during a meal-tolerance test. The maximum range of observed plasma glucose concentrations obtained from the blood samples was 2.5-27 mmol/L. The NIR spectra were processed by using the chemometric multivariate calibration methods of partial least squares and principal component regression. The best calibration yielded a cross-validated average absolute error in glucose concentration of 1.1 mmol/L. This predictive ability suggests that noninvasive glucose determinations by NIR/chemometrics is a viable analytical method.

Sociosexuality and Romantic Partner Choice

Abstract: In three studies, we explored how individual differences in sociosexual orientation systematically relate to the types of attributes people prefer in romantic partners. In Investigation 1, individuals rated the importance of 15 partner attributes. Two factors emerged: personal/parenting qualities and attractiveness/social visibility. Individuals who possessed a restricted sociosexual orientation rated attributes that loaded highly on the former factor as being more important than those that loaded highly on the second one, whereas the reverse was true for unrestricted individuals. In Investigation 2, individuals evaluated two prospective romantic partners, one who was described as highly attractive and socially visible but less desirable in terms of personal/parenting qualities and one who had the opposite set of attributes. Unrestricted individuals tended to select the former partner, whereas restricted individuals chose the latter one. Investigation 3 examined the attributes actually possessed by their romantic partners. Unrestricted individuals were dating partners who were more socially visible and attractive, whereas restricted individuals were dating partners who were more responsible, faithful/loyal, and affectionate. Results are discussed in terms of an evolutionary model that links sociosexuality to mate selection.

Tyrosine phosphorylation of vav proto-oncogene product containing SH2 domain and transcription factor motifs.

Abstract: Activation of receptor-linked and cytoplasmic protein tyrosine kinases is crucial in the control of normal and abnormal cell growth and differentiation. Some substrates of protein tyrosine kinases such as phospholipase C gamma and ras GTPase-activating protein (GAP) contain sequences homologous to the src protein domains SH2 and SH3 (refs 3-9). The proto-oncogene vav is expressed in haematopoietic cells and its product Vav contains sequence motifs commonly found in transcription factors, such as helix-loop-helix, leucine-zipper and zinc-finger motifs and nuclear localization signals, as well as a single SH2 and two SH3 domains. Here we show that stimulation of T-cell antigen receptor on normal human peripheral blood lymphocytes or on human leukaemic T cells, and the crosslinking of IgE receptors on rat basophilic leukaemia cells, both promote the phosphorylation of tyrosine residues in Vav. Moreover, activation of the receptor for epidermal growth factor leads to marked tyrosine phosphorylation of Vav in cells transiently expressing vav, and Vav associates with the receptor through its SH2 domain. We propose that vav encodes a new class of substrates whose tyrosine phosphorylation may provide a mechanism for direct signal transduction linking receptors at the cell surface to transcriptional control.

Resonantly enhanced refractive index without absorption via atomic coherence

Abstract: An enhancement of the index of refraction accompanied by vanishing absorption is shown to be possible in an ensemble of phase-coherent atoms (``phaseonium''). A survey of various possible schemes in which coherence is established by certain coherent or incoherent methods is given, and the main results are compared and contrasted. In particular, the influence of processes such as Doppler broadening that degrade coherence is discussed.

The evolutionary psychology of men's coercive sexuality

Abstract: Psychological adaptation underlies all human behavior. Thus, sexual coercion by men could either arise from a rape-specific psychological adaptation or it could be a side-effect of a more general psychological adaptation not directly related to rape. Determining the specific environmental cues that men's brains have been designed by selection to process may help us decide which these rival explanations is correct. We examine six testable predictions against existing data: (1) Both coercive and noncoercive will be associated with high levels of sexual arousal and performance in men. (2) Achieving physical control of a sexually unwilling woman will be sexually arousing to men. (3) Young men will be more sexually coercive than older men. (4) Men of low socioeconomic status will likewise be more sexually coercive. (5) A man's motivation to use sexual coercion will be influenced by its effects on social image. (6) Even in long-term relationships men will be motivated to use coercion when their mates show a lack of interest in resistance to sex because these are interpreted as signs of sexual infidelity. Current data support all six predictions and are hence consistent with the rape-specific hypothesis, but this does not eliminate the side-effect hypothesis, which is likewise compatible with the findings, as well as with the further evidence that forced matings increased the fitness of ancestral males during human evolution. We suggest some research that may help decide between the two hypotheses.

West of Everything: The Inner Life of Westerns

Abstract: A leading figure in the debate over the literary canon, Jane Tompkins was one of the first to point to the ongoing relevance of popular women's fiction in the 19th century, long overlooked or scorned by literary critics. Now, in West of Everything, Tompkins shows how popular novels and films of the American west have shaped the emotional lives of people in our time. Into this world full of violence and manly courage, the world of John Wayne and Louis L'Amour, Tompkins takes her readers, letting them feel what the hero feels, endure what he endures. Writing with sympathy, insight, and respect, she probes the main elements of the Western--its preoccupation with death, its barren landscapes, galloping horses, hard-bitten men and marginalized women--revealing the view of reality and code of behavior these features contain. She considers the Western hero's attraction to pain, his fear of women and language, his desire to dominate the environment--and to merge with it. In fact, Tompkins argues, for better or worse Westerns have taught us all--men especially--how to behave. It was as a reaction against popular women's novels and women's invasion of the public sphere that Westerns originated, Tompkins maintains. With Westerns, men were reclaiming cultural territory, countering the inwardness, spirituality, and domesticity of the sentimental writers, with a rough and tumble, secular, man-centered world. Tompkins brings these insights to bear in considering film classics such as Red River and Lonely Are the Brave, and novels such as Louis L'Amour's Last of the Breed and Owen Wister's The Virginian. In one of the most moving chapters (chosen for Best American Essays of 1991), Ttompkins shows how the life of Buffalo Bill Cody, killer of Native Americans and charismatic star of the Wild West show, evokes the contradictory feelings which the Western typically elicits--horror and fascination with violence, but also love and respect for the romantic ideal of the cowboy. Whether interpreting a photograph of John Wayne of meditating on the slaughter of cattle, Jane Tompkins writes with humor, compassion, and a provocative intellect. Her book will appeak to many Americans who read or watch Westerns, and to all those interested in a serious approach to popular culture.

Using Montane Mammals to Model Extinctions Due to Global Change

Abstract: We use data on the species-area relationship and the nested subset structure of the boreal mammal faunas inhabiting isolated mountaintops in the Great Basin to develop a simple quantitative model that predicts the number and identity of species that would go extinct under an assumed scenario of changing climate and vegetation. Global warming of 3°C is predicted to cause the loss of 9–62% of the species inhabiting each mountain range and the extinction of three of fourteen species throughout the region. These results suggest (1) that it is possible to make highly plausible predictions about the susceptibility of species to extinction without detailed information about their population biology, and (2) that global and regional environmental changes seriously threaten the survival of species that are restricted in distribution to both natural “habitat islands” and biological reserves. Usando datos acerca de la relacion especie-area y la estructura en subgrupos anidados que caracteriza a la fauna de mamiferos boreales que habitan los picos montanosos aislados en “Great Basin,” desarrollamos un modelo quantitativo que predice el numero e identidad de las especies que se extinguirian bajo un supuesto escenario de cambios en clima y vegetacion. Se predice que un calentamiento global de 3°C causaria la perdida de un 9–62% de las especies que habitan cada cadena montanosa y la extincion de tres de las 14 especies a traves de la region. Estos resultados sugieren que: (1) es posible hacer predicciones con un alto grado de seguridad acerca de la suceptibilidad de las especies a la extincion, sin contar con una detallada informacion acerca de sus biologias poblacionales, y (2) que cambios ambientales tanto globales como regionales, amenazan seriamente la supervivencia de las especies, cuya distribucion se encuentra restringida tanto a “habitat insulares” de caracter natural como a reservas biologicas.

Oximeter for reliable clinical determination of blood oxygen saturation in a fetus

Abstract: With the crude instrumentation now in use to continuously monitor the status of the fetus at delivery, the obstetrician and labor room staff not only over-recognize the possibility of fetal distress with the resultant rise in operative deliveries, but at times do not identify fetal distress which may result in preventable fetal neurological harm. The invention, which addresses these two basic problems, comprises a method and apparatus for non-invasive determination of blood oxygen saturation in the fetus. The apparatus includes a multiple frequency light source which is coupled to an optical fiber. The output of the fiber is used to illuminate blood containing tissue of the fetus. In the preferred embodiment, the reflected light is transmitted back to the apparatus where the light intensities are simultaneously detected at multiple frequencies. The resulting spectrum is then analyzed for determination of oxygen saturation. The analysis method uses multivariate calibration techniques that compensate for nonlinear spectral response, model interfering spectral responses and detect outlier data with high sensitivity.

Trade-Offs between female food acquisition and child care among hiwi and ache foragers.

Abstract: Even though female food acquisition is an area of considerable interest in hunter-gatherer research, the ecological determinants of women’s economic decisions in these populations are still poorly understood. The literature on female foraging behavior indicates that there is considerable variation within and across foraging societies in the amount of time that women spend foraging and in the amount and types of food that they acquire. It is possible that this heterogeneity reflects variation in the trade-offs between time spent in food acquisition and child care activities that women face in different groups of hunter-gatherers. In this paper we discuss the fitness trade-offs between food acquisition and child care that Hiwi and Ache women foragers might face. Multiple regression analyses show that in both populations the daily food acquisition of a woman’s spouse is negatively related to female foraging effort. In addition, nursing mothers spend less time foraging and acquire less food than do nonnursing women. As the number of dependents that a woman has increases, however, women also increase foraging time and the amount of food they acquire. Some interesting exceptions to these general trends are as follows: (a) differences in foraging effort between nursing and nonnursing women are less pronounced when fruits and roots are in season than in other seasons of the year; (b) foraging return rates decrease for Ache women as their numbers of dependents increase; and (c) among Ache women, the positive effect of number of dependents on foraging behavior is less pronounced when fruits are in season than at other times of the year. Lastly, in the Hiwi sample we found that postreproductive women work considerably harder than women of reproductive age in the root season but not in other seasons of the year. We discuss how ecological variation in constraints, the number of health insults to children that Hiwi and Ache mothers can avoid, and the fitness benefits they can gain from spending time in food acquisition and child care might account for differences and similarities in the foraging behaviors of subgroups of Hiwi and Ache mothers across different seasons of the year. Valid tests of the explanations we propose will require considerable effort to measure the relationship between maternal food acquisition, child care, and adverse health outcomes in offspring.

Functional morphology of the endomysium in series fibered muscles

Abstract: Many skeletal muscles, including the feline biceps femoris, are composed of short, tapered myofibers arranged in an overlapping longitudinal series. The endomysium of such muscles transfers tension between overlapping myofibers, and is thus an elastic element in series with them. The endomysium of the cat biceps femoris contains curvilinear collagen fibrils in an approximately isotropic (random) array. The collagen fibrils undergo only a modest reorientation as the myofibers shorten or lengthen within the physiological range. A geometrical model predicts no change in the thickness of the endomysium on changing muscle fiber length and quantifies the expected collagen fibril reorientation in the endomysium as a function of muscle extension. It is also demonstrated that a high proportion of the collagen fibrils will be curvilinear at all sarcomere lengths. The organization of endomysial collagen is appropriate for the transfer of loads between myofibers by means of shear.

Breast Cancer In Men: Risk Factors with Hormonal Implications

Abstract: Cases included in a population-based case-control study of breast cancer in men were recruited from 10 geographic areas of the United States from 1983 to 1986. Controls, matched to cases on age and geographic area, were selected by random digit dialing for men under age 65 years and from Health Care Financing Administration files for older men. Results are based on responses from 227 cases and 300 controls to questions asked in a standardized personal interview. An increased risk of breast cancer was most strongly associated with undescended testes and was also related to orchiectomy, orchitis, testicular injury, late puberty, and infertility; and a decreasing trend in risk was observed with an increasing number of children. Relative risk estimates were also elevated in relation to a history of high blood cholesterol, rapid weight gain, benign breast conditions, and possibly obesity. These findings suggest that breast cancer in men develops in response to androgen deficiency associated with testicular dysfunction and under conditions associated with excess estrogen. Risk was also found to be elevated in men with a history of amphetamine use, diabetes, and cigar smoking and reduced in men with prior head trauma.

Solution of the Sylvester matrix equation AXBT + CXDT = E

Abstract: A software package has been developed to solve efficiently the Sylvester-type matrix equation AXBT + CXDT = E. A transformation method is used which employs the QZ algorithm to structure the equation in such a way that it can be solved columnwise by a back substitution technique. The algorithm is an extension of the Bartels-Stewart method and the Hessenberg-Schur method. The numerical performance of the algorithms and software is demonstrated by application to near-singular systems.

Long-term follow-up of behavioral self-control training

Abstract: Four samples of problem drinkers treated by behavioral self-control training were evaluated at 3.5, 5, 7 and 8 years following treatment, respectively. Of 140 cases, 99 (71%) were accounted for: 23 abstinent, 14 with controlled and asymptomatic drinking, 22 improved but still impaired, 35 unremitted and 5 deceased. Abstinent versus controlled-drinking outcomes were most strongly differentiated by pretreatment severity of alcohol problems and dependence and by the patients' pretreatment self-assessment and goals. Percentages of abstainers and of relapsed cases increased at long-term follow-ups. A reasonably constant percentage of known outcomes (14%) were clearly controlled and asymptomatic drinkers in each of the follow-up samples. Most of the long-term controlled drinkers had established this pattern within the first year following treatment. However, periods of controlled drinking during the first year did not reliably predict maintenance of this pattern. Successful asymptomatic drinkers were discriminable from other outcomes based on pretreatment characteristics.

Models of character displacement and the theoretical robustness of taxon cycles.

Abstract: The appropriateness of the techniques used in modeling character displacement has been the focus of vigorous debate. In this paper, the three competing methods (the coevolutionarily stable community (CSC), the evolutionarily stable strategy (ESS), and quantitative genetic recursion (QGR)) are compared in models using a common ecological setting. Specific predictions of the CSC model have been used to understand features of character displacement among Cnemidophorous lizards on islands off Mexico, Anolis lizards in the Lesser Antilles and Galapagos finches. Nonetheless, the validity of the approach has been repeatedly questioned. Conceptually the three formalisms vary in the degree to which within species variability is allowed in the models. The predictions of the CSC are found not to be robust to even small violation of its fundamental assumption of absolute species monomorphy. We show by simulation and analytical observations that the CSC is not valid under frequency dependent selection, and that the ESS is the limiting case of QGR as intraspecific phenotypic variation goes to zero. Thus the ESS and the QGR models agree closely when the between-phenotype component (BPC) of the niche width is small. However, as the BPC increases, quantitative discrepancies between ESS and QGR predictions increase, although model behavior remains qualitatively similar. A fourth approach, termed "Quantitative Genetic Optimization" (QGO) analysis, is suggested, combining advantages of both the ESS and QGR. Although all approaches support the possibility of taxon cycles, the cycle patterns predicted are qualitatively different and strongly model dependent.

Matrix correlation analysis in anthropology and genetics

Abstract: The comparative analysis of the population variation patterns exhibited by different types of information has long been a genuine anthropological/genetic preoccupation. One of the generic problems attracting repeated attention is the connection between genetic and cultural consequences of population isolation; we expect both patterns and amounts of variation to reflect the same history of group fission and fusion, but what do we see in practice? Numerous techniques have been employed in such work, all based on comparison of different matrices of pairwise distanceslaffinities. A basic difficulty with all of these methods is that the N(N – 1) pairwise elements of an (N × N) matrix cannot be mutually independent. Recently, a versatile test of matrix correlation that allows for this fact, originally developed by Mantel but since extensively modified and extended, has gained popularity in anthropology, as well as geography, ecology, sociology, psychometrics, population biology, and systematics. We present here a general framework for many of these efforts, based on the Mantel test, and then illustrate its use with four examples from our own work and that of our colleagues: (a) genetic affinity and migrational separation in the Bainwa, (b) clinal versus cluster variation in the Yanomama, (c) genetic, linguistic, and geographic affinities among the Chibcha-speaking tribes, and (d) migration and genetic affinity in the Gainj and Kalam. The technique is nonparametric and so general that it is useful for many different types of pattern comparison, even when the connections between different types of information are poorly understood. Greater analytic potential is generally realized when there are definite theoretical connections between the patterns being compared. With theoretical care and a bit of imagination, one can combine the advantages of parametric assumptions with the robustness of nonparametric analysis. Novel analyses and anthropological opportunities are emerging continuously. © 1992 Wiley-Liss, Inc.