Toxicity of Al to Desulfovibrio desulfuricans.

The toxicity of Al to Desulfovibrio desulfuricans G20 was assessed over a period of 8 weeks in a modified lactate C medium buffered at four initial pHs (5.0, 6.5, 7.2, and 8.3) and treated with five levels of added Al (0, 0.01, 0.1, 1.0, and 10 mM). At pH 5, cell population densities decreased significantly and any effect of Al was negligible compared to that of the pH. At pHs 6.5 and 7.2, the cell population densities increased by 30-fold during the first few days and then remained stable for soluble-Al concentrations of <5 x 10(-5) M. In treatments having total-Al concentrations of > or =1 mM, soluble-Al concentrations exceeded 5 x 10(-5) M and limited cell population growth substantially and proportionally. At pH 8.3, soluble-Al concentrations were below the 5 x 10(-5) M toxicity threshold and cell population density increases of 20- to 40-fold were observed. An apparent cell population response to added Al at pH 8.3 was attributed to the presence of large, spirilloidal bacteria (accounting for as much as 80% of the cells at the 10 mM added Al level). Calculations of soluble-Al speciation for the pH 6.5 and 7.2 treatments that showed Al toxicity suggested the possible presence of the Al(13)O(4)(OH)(24)(H(2)O)(12)(7+) "tridecamer" cation and an inverse correlation of the tridecamer concentration and the cell population density. Analysis by (27)Al nuclear magnetic resonance spectroscopy, however, yielded no evidence of this species in freshly prepared samples or those taken 800 days after inoculation. Exclusion of the tridecamer species from the aqueous speciation calculations at pHs 6.5 and 7.2 yielded inverse correlations of the neutral Al(OH)(3) and anionic Al(OH)(4)(-) monomeric species with cell population density, suggesting that one or both of these ions bear primary responsibility for the toxicity observed.

Elder-caregiver care negotiations as dances of dependency.

Well-developed metaphors function as heuristic devices for the communication of scientific ideas. When applied to common, typical situations, metaphorical conceptualization enables a richer and deeper understanding. In this article, the routinized and taken-for-granted situation of elder-caregiver care negotiations is examined through the use of a dance metaphor, the dance of dependency. Metaphorical models of theory are intended to be elaborated and developed in ways that good poetic metaphors are not. Therefore, we systematically describe the general aspects of the dance (rules, facilitators, performances, aesthetics) and relate the specific elements of a dance to the dance of dependency. The picture that emerges is one of elder-caregiver care negotiations as performances, with elders as agents who actively and creatively engage caregivers in their dances of dependency. Participants in these dances sustain a complex organization of behavior to meet the situational demands and maintain themselves as fully integrated participants, based on standards set forth by the jointly negotiated working consensus of the dyad. The resulting description extends what is currently understood about everyday care negotiations, allowing an appreciation of the processes and dynamics by which care negotiations and elder-caregiver relational cultures in multiple contexts unfold, change, and are challenged.

Patients' explanatory models for heart failure and COPD exacerbations.

Although there is extensive information on the disease aspect of heart failure (HF) and chronic obstructive pulmonary disease (COPD), the illness aspect of these diseases has received limited attention. This limitation in our knowledge is of concern because these diseases are increasing in incidence and prevalence and contributing to the premature morbidity and mortality of thousands of persons. This naturalistic inquiry study was undertaken to describe the explanatory models (EMs) of persons hospitalized for HF (n = 30) or COPD (n = 30) exacerbations. In semistructured interviews, participants offered descriptions of the etiology, cause, and effects of their disease exacerbations and identified interventions that they believed would have helped prevent their hospitalizations or helped them to live better at home. The findings provide a basis for understanding the EMs of persons with HF or COPD as an initial step in making health care more relevant.

Protective care-receiving: the active role of care-recipients.

Historical and contemporary conceptualizations of caregiving have not addressed the active role of care recipients within caregiver-care-recipient relationships. Using an interpretive synthesis method, the authors developed the concept of protective care-receiving from three qualitative studies of different groups of care receivers (older adults with chronic illnesses, persons with AIDS, and persons in treatment for active cancer). This paper describes the focus of care recipients' protective care-receiving efforts, the goals they hoped to achieve, and the strategies they used to assist themselves in attaining their goals. Examples of their efforts and strategies are illustrated with quotations from the data. These findings extend what is known about care recipients' selfcare activities. Moreover, the findings reveal a new dimension in the role of care recipients--protective care given by care recipients to their professional care providers, family and friend caregivers, and other care recipients. The concept of protective care-receiving advances our understanding of caregiving relationships and presents researchers with the opportunity to investigate the complex encounter between caregiver and care recipient. Recognizing and facilitating care recipients' protective care-receiving is an ethical imperative for a 'caring' profession such as nursing.

ACTION: application and extension of the GENESIS community analysis model.

GENESIS (General Ethnographic and Nursing Evaluation Studies In the State) is a tested and proven community analysis strategy that integrates ethnographic and epidemiologic data to arrive at a comprehensive, holistic description of the health of a community and its residents. Communities analyzed in most project GENESIS studies have been rural or semirural. ACTION (Assessing Communities Together in the Identification Of Needs) is an extension of the GENESIS community analysis model that was developed to meet the unique needs of community-level research and analysis in an urban, multicultural setting. Significant differences in the context in which the ACTION projects took place necessitated extensions in specific components of the GENESIS model. Application of the GENESIS model by the ACTION team is described. Based on the experiences with ACTION, recommendations are offered for future urban, multicultural community analysis projects.

Toward a cross-cultural perspective of family caregiving.

This article is part of a symposium that explores the issues involved in developing cross-culturally equivalent conceptualizations and measures for studying family caregiving. The examples used are from the instrument development phase of an ongoing program of research designed to generate and test a theory that explains the quality of family caregiving for frail elders at home. This article provides the background for the symposium by introducing the symposium's unifying theme: cross-cultural equivalence. The process described is based on the experiences of the cross-cultural research team and Berry's model for developing cross-culturally equivalent research.

Toward a cross-cultural understanding of family caregiving burden.

This article is part of a symposium describing the development of cross-culturally relevant instruments to measure familism, caregiver burden, and quality of elder caregiving among Anglo- and Mexican American caregivers. This article explores issues involved in measuring caregiving burden. Caregiving burden is thought to adversely affect family caregiving, but the influence of culture on perceptions of burden has not been explored. Because no research focuses on caregiving burden among Mexican American caregivers, the first step involved reviewing the literature for cultural factors influencing caregiving and using the expertise of the cross-cultural team to identify and compare the meaning of caregiving burden in both groups. Next, two instrumentation studies were done to analyze the items on Poulshock and Deimling's Burden Instrument for comparable meaning and internal consistency within and between groups. The third step involved assessing the validity of Poulshock and Deimling's conceptualization of burden cross-culturally.

The relevance of familism in cross-cultural studies of family caregiving.

Although familism has been studied in both Mexican American and Anglo families, there is controversy about whether familism in both groups is the same. Research has shown great within-group variability, and in addition, the kinship structure in the two groups is fundamentally different. This article explores the cross-cultural issues in conceptualizing familism and its relevance to caregiving among Anglo and Mexican American caregivers. Based on data obtained in an ongoing research program, the process of arriving at similarities and differences in the expression of familism is discussed using Berry's criteria for achieving cultural equivalence.

Uncovering the cultural context for quality of family caregiving for elders.

This article is part of a symposium exploring issues in developing cross-culturally equivalent conceptualizations and measures for a study of elder family caregiving. This article describes the development of an instrument to measure quality of elder family caregiving among Anglo and Mexican American caregivers. Following a review of typical approaches for evaluating quality of caregiving, a cross-cultural standard for excellence in elder caregiving is described. An instrument consistent with the United Nations Universal Declaration of Human Rights, the QUALCARE Scale, is identified as an appropriate cross-cultural instrument for assessing the quality of elder family caregiving. Refinement of the QUALCARE Scale using Berry's model for cross-cultural research, which necessitated identification of appropriate cross-cultural indicators of quality, is described. Examples of this process of indicator clarification are given for several basic human rights, based on the cross-cultural research team members' experiences with Anglo and Mexican American caregivers.

Elder care recipients' care-seeking process.

The care-seeking process used by elders residing in a continuing-care retirement community to elicit care from caregivers and engage caregivers in care interactions is described. Generated from 8 months of ethnographic field research that incorporated semistructured interviewing, participant observation, and focus group interviewing data collection strategies with 47 elders, the care-seeking process emerged as the sequential phases and stages that evolved over time in elders' interactions with their formal and informal caregivers. The findings extend what is currently known about the active and thoughtful role elders assume in their care interactions. An understanding of the ways elders elicit care and engage caregivers may assist nurses to maximize their care interactions with elders.

Effects of the situational context and interactional process on the quality of family caregiving.

A staged theoretical model designed to explain the quality of elder caring by family members was tested. The model posits how the situational context, interactional process, and caregiving burden perceived by the caregiver affect the quality of elder caring. The purpose was to determine the amount of variance explained by the interactional process beyond that explained by the situational context and caregiving burden. Data were collected from 209 elder-caregiver dyads using interviews, observations, and caregiver self-reports. The strongest predictors of caregiving burden were the caregiver's stressful negative life events (situational context) and discrepancy between past and present image of elder (interactional process). The strongest predictors of quality of elder caring were the caregiver's perception of subjective burden and a monitoring role definition on the part of the caregiver (interactional process).

Monsanto's computer animal proposal system (CAPS).

Regulations and standards must include the minimum requirements with respect to veterinary care, sanitation, handling, feeding, and housing. Part 1 of the Animal Welfare Act regulations was amended to update, clarify, and expand the list of definitions of terms and standards. Section 9 CFR, Part 1, contains definitions and deals with animal welfare, animal housing, dealers, exhibitors, research facilities, and humane animal handling. The subjects in 9 CFR, Part 2, pertain to licensing, registration, identification of animals, records, institutional animal care and use committees, and adequate veterinary care. Animal welfare, humane animal handling, pets, transportation, and reporting and recordkeeping requirements are the subjects listed in 9 CFR, Part 3.

Issues for consideration when choosing a qualitative data management system.

A primary issue in conducting qualitative research is the time required for data analysis. Qualitative research can be costly, since data analysis is generally labour intensive and our time factors into money. There is, unfortunately, no magic formula for hastening the conceptual tasks associated with qualitative analysis, yet effective qualitative data management systems (QDMS) expedite the mechanical tasks, those tasks associated with storing and retrieving qualitative data. Rapid and smooth data management increases the time one can allot to data analysis. Although computer QDMS are increasingly recommended for their time-saving potential in relation to data management, some significant issues associated with the adoption of a computer versus a manual QDMS have not yet been fully explored. The purpose of this paper is to present major issues researchers should consider in choosing a computer or a manual QDMS. These issues include availability and accessibility, comfort, appropriateness, efficiency, thoroughness and contextualization.

Immunization mall programs.

This descriptive survey provided the Health Department and its CHNs with data heretofore unexamined. The survey provided a beginning analysis and description of three major areas which assisted the County Health Department in establishing vital base line information regarding: (a) where people usually went for immunizations, (b) how they heard about the mall program, and (c) whether they would return to future mall programs. Recommendations from the survey demonstrate the need for the county health department and CHNs to increase the number and length of programs and to meet client demand. The survey has implications for all public health departments and CHNs as they examine the most cost effective strategies to promote and provide immunizations for vaccine preventable disease to clients of all ages.