Browsing by Subject "treatment"
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Item Diagnostic relapse in Borderline Personality Disorder: risk and protective factors(Texas A&M University, 2004-11-15) Quigley, Brian DavidBorderline Personality Disorder (BPD) is one of the more common personality disorder diagnoses observed in psychiatric inpatients and outpatients. Previous studies have found that individuals with BPD may be expected to experience difficulties throughout their lifetimes and they may repeatedly return for psychological treatment. Whereas previous studies have attempted to identify various factors related to relapse in other chronically recurring disorders such as depression, schizophrenia, and substance abuse, studies examining factors associated with relapse in BPD, and personality disorders in general, are absent from the scientific literature. This exploratory study examined whether specific risk and protective factors (dynamic and/or static) identified from the general relapse literature were associated with diagnostic relapse in BPD. Results revealed that variables related to an increased likelihood for BPD relapse included: substance abuse or Major Depressive Disorder, higher Neuroticism, and lower Conscientiousness. In addition, having a steady work or school status after remission was found to protect against a BPD relapse in the presence of various risk factors. Although this study has several limitations, these results provide some of the first insights to the processes of relapse and continued remission in BPD patients. Continued research efforts in this area can help to identify individuals who are at a greater risk for BPD relapse and potentially to design effective relapse-prevention strategies for the treatment of BPD.Item The effect of nutrient limitations on the production of extracellular polymeric substances by drinking-water bacteria(2013-05) Evans, Ashley Nichole; Kirisits, Mary JoBiological filtration (biofiltration) of drinking-water is gaining popularity due the potential for biodegradation of an array of contaminants not removed by traditional drinking-water processes. However, previous research has suggested that biomass growth on biofilter media may lead to increased headloss, and thus, greater energy and water requirements for backwashing. Research has suggested that the main cause of headloss might be due to extracellular polymeric substances (EPS) rather than the bacterial cells themselves. As EPS production has been shown to increase under nitrogen- and phosphorus-limited or -depleted conditions, the goal of this research was to add to the body of knowledge regarding biofiltration by studying the relationship between EPS production and nutrient limitations in drinking-water. Batch experiments with a synthetic groundwater were run with a mixed community of drinking-water bacteria under nutrient-balanced (a molar carbon to nitrogen to phosphorus ratio [C:N:P] of 100:10:1), nutrient-limited (e.g., C:N:P of 100:10:0.1), and nutrient-depleted conditions (C:N:P of 100:0:1 or 100:10:0). After 5 days, growth was measured as the optical density at 600 nanometers (OD600), and the concentrations of free and bound carbohydrates and proteins, the main components of EPS, were measured. In batch experiments with 2.0 and 0.2 g/L as carbon (mixture of acetic acid, mannitol and sucrose) increases in EPS production per OD600 and decreases in growth were noted under nutrient-depleted conditions. When the same experiments were conducted with a pure culture of Bacillus cereus, bound polysaccharides normalized to OD600 increased under nitrogen- and phosphorus-depleted conditions. Since previous research suggested that Bradyrhizobium would be an important player in EPS production in drinking-water biofilters, similar batch experiments were conducted with Bradyrhizobium. However, due to experimental challenges with Bradyrhizobium japonicum USDA 110, differences in EPS production under nutrient limitations could not be reliably assessed. Additional work is required with Bradyrhizobium. Recommendations for future work include the replication of these batch conditions in steady-state chemostats containing biofilm attachment media and in bench-scale columns. Additionally, future work should include experiments at carbon concentrations as low as 2 mg/L to match typical carbon concentrations in drinking-water biofilters.Item Studies on the molecular epidemiology, pathogenesis, diagnosis and treatment of avian mycobacteriosis(2009-05-15) Saggese, Miguel DanielWe investigated the molecular epidemiology, differential susceptibility to infection and disease, pathogenesis, diagnosis and treatment of avian mycobacteriosis in captive ringneck doves (Streptopelia risoria) and in the endangered white-winged duck (Cairina scutulata), both naturally infected with Mycobacterium a. avium. Our studies in doves demonstrated lower susceptibility to infection and less severity of lesions in the white color morph compared with the non-white. Genetic mechanisms of immunity to mycobacteriosis may be contributing or determining these differences. Given that the genes that code for white coloration are sex linked in birds, it is very likely that the gene or genes modulating this different immune response to M. a. avium infection in these doves could be associated to these loci or at least located in the same sexual (Z) chromosome, as the association with white color suggest. In the same birds, spleen biopsies followed by liver biopsies had the greatest potential for the diagnosis of mycobacteriosis by the demonstration of acid-fast organisms. Additional culturing of spleen or liver biopsies significantly increased the diagnosis of mycobacteriosis. The use of polymerase chain reaction (PCR) was the less sensitive techniques. Uneven distribution and low number of organisms in the liver, spleen and bone marrow may have contributed with the low diagnostic value of PCR. In a second group of sixteen doves with mycobacteriosis from the same flock, the combination of azithromycine, ethambutol and rifampin for 180 days was well tolerated but failed to cure them. Furthermore, this study demonstrated the inefficacy of liver biopsy to evaluate treatment as well the presence of antibiotic resistance in two isolates. These results highlight that erradication of mycobacteriosis in birds is not easy to achieve. Together with the possible emergence of antibiotic resistance in potentially zoonotic mycobacteria our results suggest that the treatment of mycobacteriosis in birds should not be recommended. Finally, the last study shows that white-winged ducks are highly susceptible to at least two sequevars of M. a. avium and that mycobacteriosis is a major threat to the ex situ conservation program. The minimal heterozygosis previously shown in these ducks could be contributing to this apparently ineffective immune response.