Assessment of DNA Integrity From Trap-Captured Boll Weevil (Coleoptera: Curculionidae) for Use in a New PCR-Based Diagnostic Tool

The boll weevil, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae), is a major pest of commercial cotton (Gossypium hirsutum) in the southern United States and throughout Central and South America. Efforts are underway to develop a PCR-based diagnostic tool that can be used to rapidly and accurately differentiate boll weevils from other weevil species that are commonly captured in pheromone traps. However, the quantity and integrity of weevil DNA must be sufficient for a successful PCR assay. Currently, active eradication programs service traps weekly, but post-eradication programs service traps at 2- or 3-wk intervals. Consequently, captured weevils may be dead, dismembered, and exposed to environmental conditions for prolonged periods which may adversely affect the quantity and quality of weevil DNA. We documented DNA quantity and integrity in boll weevils and weevil body parts aged in traps over a 3-wk period under field conditions. The quantity of DNA extracted from whole weevils, heads, abdomens, and legs generally remained sufficient (> 1 ng/μl) for successful PCR amplification throughout the 21-d period. The integrity (fragment length) of extracted DNA declined over time but generally was sufficient (> 700 bp) for successful amplification. PCR amplification of three marker genes validated that the quality and integrity of DNA extracted from dead weevils and individual weevil body parts aged in traps up to 21 d remained at sufficient levels for the PCR-based assay. However, our data also suggested that rain events may accelerate degradation of weevil DNA.

Palliative care patients' perceptions of the work involved in understanding and managing the network of care provision surrounding them

OBJECTIVE

To explore the work carried out for cancer palliative care patients in understanding and dealing with the often large network of care provision surrounding them.

METHOD

Qualitative thematic analysis of interviews with 24 patients (aged 48-85 years) with 15 different types/sites of cancer and palliative care needs.

RESULTS

The main theme of 'patient work-their strategies and project management' is presented. Subthemes included: being organised and keeping records; planning ahead and coordinating care; information gathering; understanding the hierarchy and knowing who the key people are; strategies to remember names and roles; understanding and 'working the system'. Insights are given into the work carried out on patients' behalf by family, although it was unclear who would do this work if no family was available. Some of the challenges faced by patients and families are identified. These included limited information; uncertainty when care is transferred between different teams or locations; deciding who to contact and how; and negotiating through gatekeepers.

CONCLUSIONS

The number and variety of people contributing to the care of a cancer palliative care patient can be difficult for patients and family to comprehend. Work is required by patients or family on their behalf to achieve the level of understanding required to become accomplished at navigating the system and project managing their care organisation, and is probably influenced by role expectations and previous experience. Much of this additional, often hidden, workload for patients and family could probably be reduced with clear, timely information provision by health professionals.

Comparisons of boll weevil (Coleoptera: Curculionidae) pheromone traps with and without kill strips

Boll weevil, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae), eradication programs typically equip pheromone traps with an insecticide-impregnated kill strip. These strips are intended to kill captured insects, thereby simplifying trap servicing and reducing the loss of weevils from predation and escape. However, the effectiveness of kill strips has not been extensively evaluated. We examined the influences of kill strips on weevil captures, trap servicing, and the incidences of weevil predation and trap obstruction (e.g., by spider webs). Evaluations were conducted weekly during three different production periods (pre- to early-, late-, and postseason) of cotton, Gossypium hirsutum L., to represent different environmental conditions and weevil population levels. Within each period, mean weekly captures of weevils in traps with and without kill strips were statistically similar. On average, traps with kill strips took 9 s longer to service than traps without kill strips, but statistical differences were only detected during the late-season period. Overall, the mean weekly proportion of traps with evidence of weevil predation or trap obstruction was significantly lower for traps with kill strips (0.25) than for traps without kill strips (0.37). However, this reduction in the frequency of weevil predation or trap obstruction was too small to produce a corresponding increase in the numbers of weevils captured. In light of these findings, the use of kill strips is likely unnecessary in eradication programs, but may be a consideration in situations when the numbers of deployed traps are reduced and chronic problems with weevil predation or trap obstruction exist.

The use of reflection in a palliative care programme: a quantitative study of the development of reflective skills over an academic year

The use of reflection in a palliative care programme: a quantitative study of the development of reflective skills over an academic year Reflection has gained a reputation for encouraging the integration between theory and practice within professional education. However, this reputation is based on an evidence base that mostly consists of theoretical debate. The aim of this study was to test our experience that the ability to reflect is developmental and that some reflective skills are harder to achieve than others. The research was undertaken by assessing the degree to which registered nurses achieved reflective criteria within assignments submitted for a variety of palliative care undergraduate modules. A total of 160 assignments were analysed using a marking grid constructed from a literature review and the results were compared between students and across academic terms. The results suggest that students are able to describe their practice but find it harder to analyse knowledge, the context of care and to action plan. Nevertheless, reflective abilities developed over time with significant developments made between each term. However, the development of skills indicative of critical reflection was less evident and confined to the ability to raise implications for future learning. The lack of multivariate analysis limits the study. However, the findings build on previous research and prompt questions for future work, particularly with respect to the process of reflection and how this can be supported in order to encourage the development of critical reflective skills.

Efficacy and safety of dry powder fluticasone propionate in children with persistent asthma

BACKGROUND

Flovent Diskus is a powder formulation of the inhaled corticosteroid fluticasone propionate (FP) delivered via a breath-actuated, multidose inhaler.

OBJECTIVE

To determine the efficacy and safety of dry powder FP administered once or twice daily (200 microg per day) to children with persistent asthma.

METHODS

Twelve-week, randomized, double-blind, placebo-controlled, multicenter trial with a 52-week, open-label extension. Children aged 4 to 11 were required to have pulmonary function 50% to 85% of predicted values. The population was stratified for baseline therapy (inhaled corticosteroid/cromolyn or bronchodilators only). After a 2-week placebo run-in, 242 patients received dry powder FP 200 microg each morning, dry powder FP 100 microg BID, or placebo for 12 weeks; 192 were rerandomized to the QD or BID regimen for an additional 52 weeks of open-label treatment. Primary endpoints were mean changes in FEV1 and morning PEF recorded at clinic visits.

RESULTS

Both dry powder FP regimens significantly improved FEV1, evening PEF, and asthma symptoms at the double-blind phase endpoint (P < or = .017 compared with placebo). The BID regimen also significantly improved morning PEF and nighttime awakenings due to asthma (P < or = .005). Among patients previously treated with inhaled corticosteroids/cromolyn, improvements observed with the QD and BID regimens were similar. Patients switched from BID to open-label QD treatment showed additional improvements at week 52 generally comparable to patients who received the BID regimen during both phases. Fluticasone propionate was well tolerated for up to 64 weeks with few reports of drug-related adverse events or morning plasma cortisol abnormalities.

CONCLUSIONS

Once daily dosing of dry powder FP 200 microg is an effective and convenient alternative for children whose asthma is controlled with a more frequent dosing regimen of inhaled corticosteroids.

Comparison of once- and twice-daily dosing of fluticasone propionate 200 micrograms per day administered by diskus device in patients with asthma treated with or without inhaled corticosteroids

BACKGROUND

There are limited published data regarding the efficacy of once- versus twice-daily administration of flutica-sone propionate.

OBJECTIVE

Our purpose was to evaluate the effectiveness of fluticasone propionate powder 200 microg/d administered as a once- or twice-daily dosage regimen in patients who were currently being treated with bronchodilators only (BD patients) and in patients who required inhaled corticosteroids for maintenance treatment of asthma (ICS patients).

METHODS

Five hundred seventy patients were randomly assigned to receive one of the following inhaled treatments through the Diskus device (Glaxo Wellcome, Research Triangle Park, NC) for 12 weeks: fluticasone propionate 100 microg twice daily (FP100BID) or 200 microg once daily (FP200QD) or placebo.

RESULTS

BD patients treated with FP100BID, FP200QD, and placebo had mean increases in FEV(1) from baseline to end point of 0. 49 L, 0.37 L, and 0.21 L, respectively (P <.001, FP100BID vs placebo; P =.05, FP200QD vs placebo). ICS patients treated with FP100BID and FP200QD had mean increases in FEV(1) of 0.27 L and 0.11 L, respectively, compared with a decrease in FEV(1) of -0.08 L with placebo (P <.001, FP100BID vs placebo; P =.023, FP200QD vs placebo). BD patients treated with FP100BID and FP200QD had mean increases in morning peak expiratory flow from baseline to end point of 31 L/min and 27 L/min, respectively, compared with a 1 L/min increase in patients treated with placebo. ICS patients treated with FP100BID had a mean increase in morning peak expiratory flow (from baseline to end point) of 18 L/min compared with mean decreases of -3 L/min and -12 L/min in the FP200QD and placebo groups, respectively. More patients were withdrawn from placebo (26% and 48%, in BD and ICS patients, respectively) than from fluticasone propionate (7%-9% [BID-QD] and 18%-32% [BID-QD], in BD and ICS patients, respectively) because of failure to meet predetermined asthma stability criteria.

CONCLUSION

The efficacies of FP100BID and FP200QD were comparable with regard to improvement in pulmonary function and asthma stability in BD patients. In ICS patients, asthma control was maintained with FP200QD, whereas FP100BID provided greater improvements in pulmonary function and asthma stability.

An exploration of anticipatory grief: the lived experience of people during their spouses' terminal illness and in bereavement

Anticipatory grief has been the subject of much debate since Lindemann first coined the term to describe premature mourning. Much of the research in this area takes a positivist approach focusing on the effect of anticipatory grief on bereavement. In contrast, this study, explores anticipatory grief through a Heideggerian phenomenological approach to elicit the experience of anticipatory grief. Unstructured interviews were conducted with four participants. The resulting data were interpreted using hermeneutics and evaluated using the criteria identified by Madison. The themes arising from this interpretation identify the change the participants experienced. Although these findings are limited to four participants, they are offered to raise awareness of the impact of multiple role loss and the impact of diagnosis on supporting partners. The findings also raise ways in which nurses might support people experiencing loss.

An analytical study of the changing health of a hospice population 1978-89

This study explores the changing characteristics of patients admitted to Sir Michael Sobell House, Oxford, between 1978-89. These dates represent the period between the first available records and the first computerized records. Analysis is between these dates and has been undertaken to enable future comparison between the early life of the unit with more recent developments. Using secondary sources the following areas were compared statistically: information related to general characteristics such as sex and age; information related to referral such as the number of referrals; diagnosis on referral and reasons for referral; information related to problems presented and place of death. Significant findings included an increase in referrals and patient survival; an increase in patients dying at home; a decrease in symptoms presented on referral and fewer referrals for terminal care; and an increase in referral for rehabilitation, assessment and support. Reasons for these changes are suggested.

Establishing a bereavement service

Susan Duke looks at research into the effects of bereavement and examines the interventions necessary for establishing the most helpful support service. Current research is limited, she says, and suggests that bereavement programmes should see research as an important component of their function. With the right preparation, existing staff can provide support without the need for bereavement specialists.

Physical properties of two new crown and bridge veneering resins

The degree of conversion and physical properties of two contemporary resin veneers based on light-cured microfilled composite formulations and employing proprietary curing systems were evaluated. Visio-gem (V) and Dentacolor (D) were polymerized using the appropriate curing systems. Polymer structure and degree of conversion were determined by Fourier transform infra-red (FTIR) techniques. Physical properties, including depth of cure, compressive and diametral tensile strengths, hardness, thermal expansion and colour stability were determined by standard test modalities. Both materials appear to have the properties of typical microfilled resins including low compressive yield strengths and high thermal expansion coefficients. The curing system for V produced an increased depth of cure compared to conventional light curing techniques and the D system, but no clinically significant increase in the physical properties.

Response of broiler chickens to dietary supplementation with roxarsone and bacitracin methylene disalicylate in diets containing narasin

Six trials were conducted at different locations to examine the response of broiler chickens to roxarsone and bacitracin in the form of bacitracin methylene disalicylate (BMD) in the presence of the anticoccidal narasin. All diets contained narasin (80 mg/kg) and were fortified with a factorial arrangement of roxarsone (0 to 50 mg/kg) and BMD (0 or 55 mg/kg). Broilers were grown to market weights with narasin and roxarsone removed from the diets for the final 5 days. Addition of both roxarsone and BMD resulted in significant (P less than .05) improvements in body weight and feed utilization. Response to roxarsone for feed utilization was influenced to some extent by the presence or absence of BMD. Although the response to roxarsone was always positive, the degree of response was lessened by the presence of BMD. This resulted in a significant (P less than .10) interaction between roxarsone and BMD for feed utilization but not for body weight.

Immunotoxic effects of diethylstilbestrol on host resistance: comparison with cyclophosphamide

To evaluate the usefulness of host resistance assays for measurement of immunotoxicologic effects of chemicals, the immunosuppressive effects of exposure to diethylstilbestrol (DES) were compared with the effects of treatment with the known immunosuppressive drug cyclophosphamide (CPS). A panel of six host resistance models was evaluated, including infection with the bacterium Listeria monocytogenes, herpes simplex virus type 2 (HSV-2), and encephalomyocarditis virus (EMC), the yeast Cryptococcus neoformans, the parasite Naegleria fowleri, and transplantation of the B16F10 melanoma tumor. The results demonstrate a general correlation between the effects of CPS and DES on host resistance. Acute treatment with CPS (200 mg/kg) markedly depressed resistance to the microbial infections with L. monocytogenes and HSV, and exposure to DES usually also decreased resistance in a dose dependent manner. Moreover, CPS had no marked effect on resistance to N. fowleri and EMC virus, and exposure to DES also had a neglible or slight effect. There were, however, two model systems in which the effects of CPS and DES diverged. Whereas treatment with DES produced no significant effect on resistance to C. neoformans, acute treatment with CPS prior to the fungal infection produced a marked increase in resistance. Also, while treatment with CPS markedly increased B16F10 lung metastases, treatment with DES significantly decreased the incidence and number of lung metastases. The data support the general validity of host resistance assays, particularly with models of short disease course, for measuring immunosuppression. However, the results also emphasize the complexity of interpreting effects of environmental chemicals on host resistance, because of the interplay of such factors as relative times of exposure to the chemical in relation to pathogenesis of infection, the length of the disease course, the nature of the operative host defense mechanisms, and the compensatory recovery of these mechanisms.