Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 45
Filtrar
1.
Nat Chem Biol ; 16(11): 1255-1260, 2020 11.
Artigo em Inglês | MEDLINE | ID: mdl-32719558

RESUMO

The direct C-H carboxylation of aromatic compounds is an attractive route to the corresponding carboxylic acids, but remains challenging under mild conditions. It has been proposed that the first step in anaerobic microbial degradation of recalcitrant aromatic compounds is a UbiD-mediated carboxylation. In this study, we use the UbiD enzyme ferulic acid decarboxylase (Fdc) in combination with a carboxylic acid reductase to create aromatic degradation-inspired cascade reactions, leading to efficient functionalization of styrene through CO2 fixation. We reveal that rational structure-guided laboratory evolution can expand the substrate scope of Fdc, resulting in activity on a range of mono- and bicyclic aromatic compounds through a single mutation. Selected variants demonstrated 150-fold improvement in the conversion of coumarillic acid to benzofuran + CO2 and unlocked reactivity towards naphthoic acid. Our data demonstrate that UbiD-mediated C-H activation is a versatile tool for the transformation of aryl/alkene compounds and CO2 into commodity chemicals.


Assuntos
Dióxido de Carbono/química , Carboxiliases/metabolismo , Hidrocarbonetos Aromáticos/metabolismo , Oxirredutases/metabolismo , Sequência de Aminoácidos , Benzofuranos/química , Biocatálise , Biodegradação Ambiental , Carboxiliases/genética , Ácidos Carboxílicos/química , Descarboxilação , Avaliação Pré-Clínica de Medicamentos , Ativação Enzimática , Biblioteca Genômica , Hidrocarbonetos Aromáticos/química , Modelos Moleculares , Estrutura Molecular , Mutação , Naftalenos/química , Oxirredutases/genética , Relação Estrutura-Atividade , Estireno/química
2.
Prenat Diagn ; 41(13): 1624-1633, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34671992

RESUMO

BACKGROUND/OBJECTIVE: Neural tube defects (NTDs) affect approximately 300,000 pregnancies worldwide each year. Many of these pregnancies are lost to miscarriage or termination of pregnancy. Here, we have analysed the trends of termination of pregnancy for NTDs from the national data for England and Wales. METHODS: Data for all terminations for residents in England and Wales for the period of 2007-2017 were obtained through Health and Social Act 4 (HSA4) submitted to the Department of Health. Using the ICD-10 codes, terminations for NTDs were selected for analysis. The statistical test Chi-squared was performed using SPSS-v25, where appropriate. RESULTS: In the 11-year period, there were 28,866 terminations under Ground E; of which 4425 (15.33%) had a diagnosis of NTD. The number of NTD cases increased over the time period from 308 in 2007 to 517 in 2017 (67.9%). Significant results were also seen when analysing the relationship between ethnicity, gestation and terminations where an NTD was diagnosed. CONCLUSION: With the availability of routine prenatal ultrasound, the termination for NTDs is on the rise in England and Wales, in spite of the health advice of periconceptional folic acid. This study demonstrates the need for implementation of further programmes to increase public health awareness of folic supplementation and government initiation of fortification to reduce NTDs.


Assuntos
Aborto Induzido/estatística & dados numéricos , Defeitos do Tubo Neural/cirurgia , Aborto Induzido/métodos , Adulto , Inglaterra/epidemiologia , Feminino , Humanos , Defeitos do Tubo Neural/epidemiologia , Gravidez , Prevalência , Estudos Prospectivos , País de Gales/epidemiologia
3.
Pediatr Diabetes ; 19(1): 106-113, 2018 02.
Artigo em Inglês | MEDLINE | ID: mdl-28419661

RESUMO

BACKGROUND: To compare the impact of cognitive behavioural therapy (CBT) with non-directive supportive counselling (NDC) on glycaemic control and psychological well-being in adolescents with type 1 diabetes mellitus (T1DM). MATERIALS AND METHODS: Participants aged 11 to 16 years with T1DM (duration ≥1 year) from 4 UK-based paediatric diabetes centres were randomised to receive either 6 weekly sessions of 1-to-1 CBT (n = 43) or NDC (n = 42), with 2 further sessions at 6 and 12 months. Follow-up continued for 12 months postintervention. Outcome measures included glycated haemoglobin A1c (HbA1c) and psychological scores. RESULTS: The HbA1c levels were available in 33 patients in each group for analysis. Between group difference of the overall changes in HbA1c across the study period was statically significant (P = .018). Geometric mean (range) HbA1c in the NDC group deteriorated from 68 (46-113) to 78 (48-128) mmol/mol (ie, 8.4 [6.4-12.5]% to 9.3 [6.5-13.9]%; P = .001), but was maintained in the CBT group from 72 (46-129) to 73 (51-128) mmol/mol (P = .51) (ie, 8.7 [6.4-14]% to 8.9 [6.8-13.9]%). More patients who have undergone CBT showed an improved or maintained HbA1c levels at 24 months (62.5% vs 35.5%, P = .032). Patients offered CBT with depressive scores in the lowest tertile (least depressive symptoms) showed improvement in HbA1c over time from 70 (46-102) to 67 (57-87) mmol/mol (P = .041) (ie, 8.6 [6.4-11.5]% to 8.3 [7.4-10.1]%), but not in the NDC group. The CBT showed borderline improvements in Children's Health Locus of Control (internal) scores over time compared with NDC (P = .05). The self-efficacy score showed significant improvement in both CBT (P < .001) and NDC (P = .03) groups over time. CONCLUSIONS: CBT demonstrated better maintenance of glycaemic control compared with NDC.


Assuntos
Terapia Cognitivo-Comportamental , Diabetes Mellitus Tipo 1/terapia , Adolescente , Diabetes Mellitus Tipo 1/sangue , Diabetes Mellitus Tipo 1/psicologia , Feminino , Humanos , Masculino
4.
Palliat Med ; 29(6): 518-28, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25680378

RESUMO

BACKGROUND: There has been significant attention paid in recent years to the economic costs of health service provision for people with palliative care needs. However, little is known about the costs incurred by family caregivers who typically provide the bulk of care for people at the end of life. AIM: To explore the nature and range of financial costs incurred by family caregiving within a palliative care context. DESIGN: In-depth qualitative interviews were conducted with 30 family/whanau caregivers who were currently caring for someone with a life-limiting illness or had done so within the preceding year. Narrative analysis was used to identify impacts and costs at the personal, interpersonal, sociocultural and structural levels. SETTING: Auckland, New Zealand. FINDINGS: Costs of caregiving were significant and, for participants, resulted in debt or even bankruptcy. A range of direct (transport, food and medication) and indirect costs (related to employment, cultural needs and own health) were reported. A multi-level qualitative analysis revealed how costs operated at a number of levels (personal, interpersonal, sociocultural and structural). The palliative care context increased costs, as meeting needs were prioritised over cost. In addition, support from statutory service providers to access sources of financial support was limited. CONCLUSION: Families incur significant financial costs when caring for someone at the end of life. Research is now needed to quantify the financial contribution of family and whanau caregiving within a palliative care context, particularly given attempts in many countries to shift more palliative care provision into community settings.


Assuntos
Cuidadores/economia , Efeitos Psicossociais da Doença , Cuidados Paliativos/economia , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Nova Zelândia , Pesquisa Qualitativa , Inquéritos e Questionários , Assistência Terminal/economia , Adulto Jovem
5.
Med Eng Phys ; 120: 104045, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37838399

RESUMO

Cardiovascular disease is widespread in girls and women living with Turner syndrome (TS). Despite this prevalence, cardiovascular risk evaluation using the current guidelines has seen life-threatening aortic events occurring at dimensions classified within the normal threshold. In this study, we characterized the three-dimensional aortic geometries of Turner syndrome children and their age-matched healthy counterparts to evaluate various morphological parameters. Turner syndrome girls had overall greater values in ten out of fifteen parameters examined (p > 0.05), when compared to healthy children: the aortic arch height and width; the ascending aorta, aortic arch (2 locations), and descending aorta diameters; the ratio of the ascending to descending aorta diameter; average curvature; average torsion; and average curvature-torsion score. Additionally, significant associations were found in the TS group: body surface area and both arch height (p = 0.03) and arch height to width ratio (p = 0.05), and aortic arch diameter and both body surface area (p = 0.04) and weight (p = 0.04). The new information resulting from this small cohort study contributes to an improved understanding of the morphological parameters affecting the hemodynamic environment in TS, and the clinical assessment of the increased cardiovascular risk in this population.


Assuntos
Síndrome de Turner , Criança , Humanos , Feminino , Síndrome de Turner/complicações , Estudos de Coortes , Imageamento por Ressonância Magnética , Aorta , Aorta Torácica
6.
Front Sociol ; 8: 1139258, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37274606

RESUMO

This review summarizes the economic impacts of the pandemic on ethnic minorities, focusing on the city of Manchester. It utilizes multiple reporting sources to explore various dimensions of the economic shock in the UK, linking this to studies of pre-COVID-19 economic and ethnic composition in Manchester and in the combined authority area of Greater Manchester. We then make inferences about the pandemic's short-term impact specific to the city region. Greater Manchester has seen some of the highest rates of COVID-19 and as a result faced particularly stringent "lockdown" regulations. Manchester is the sixth most deprived Local Authority in England, according to 2019 English Indices of Multiple Deprivation. As a consequence, many neighborhoods in the city were always going to be less resilient to the economic shock caused by the pandemic compared with other, less-deprived, areas. Particular challenges for Manchester include the high rates of poor health, low-paid work, low qualifications, poor housing conditions and overcrowding. Ethnic minority groups also faced disparities long before the onset of the pandemic. Within the UK, ethnic minorities were found to be most disadvantaged in terms of employment and housing-particularly in large urban areas containing traditional settlement areas for ethnic minorities. Further, all Black, Asian, and Minority ethnic (BAME) groups in Greater Manchester were less likely to be employed pre-pandemic compared with White people. For example, people of Pakistani and Bangladeshi ethnic backgrounds, especially women, have the lowest levels of employment in Greater Manchester. Finally, unprecedented cuts to public spending as a result of austerity have also disproportionately affected women of an ethnic minority background alongside disabled people, the young and those with no or low-level qualifications. This environment has created and sustained a multiplicative disadvantage for Manchester's ethnic minority residents through the course of the COVID-19 pandemic.

7.
Clin Cancer Res ; 29(13): 2513-2524, 2023 07 05.
Artigo em Inglês | MEDLINE | ID: mdl-36790412

RESUMO

PURPOSE: This study characterizes intratumoral macrophage populations within baseline melanoma biopsies from patients with advanced melanoma who received either anti-PD-1 monotherapy or a combination with anti-CTLA-4. Particularly, FcγRIIIa (CD16)-expressing macrophage densities were investigated for associations with response and progression-free survival. EXPERIMENTAL DESIGN: Patients with advanced melanoma who received either anti-PD-1 monotherapy or combination anti-PD-1 and anti-CTLA-4 were retrospectively identified. Macrophage populations were analyzed within baseline melanoma biopsies via multiplex IHC in relation to treatment outcomes. RESULTS: Patients who responded to combination immune checkpoint inhibitor contained higher CD16+ macrophage densities than those who did not respond (196 vs. 7 cells/mm2; P = 0.0041). There was no diffidence in CD16+ macrophage densities in the PD-1 monotherapy-treated patients based on response (118 vs. 89 cells/mm2; P = 0.29). A significantly longer 3-year progression-free survival was observed in combination-treated patients with high intratumoral densities of CD16+ macrophages compared with those with low densities (87% vs. 42%, P = 0.0056, n = 40). No association was observed in anti-PD-1 monotherapy-treated patients (50% vs. 47%, P = 0.4636, n = 50). Melanoma biopsies with high densities of CD16+ macrophages contained upregulated gene expression of critical T-cell recruiting chemokines (CXCL9, CXCL10, and CXCL11). CONCLUSIONS: Our data demonstrate that tumor microenvironments enriched with CD16+ macrophages are favorable for response to combination anti-PD-1 and anti-CTLA-4 therapy but not anti-PD-1 monotherapy. These data provides a potential biomarker of response for combination immunotherapies in patients with metastatic melanoma. See related commentary by Smithy and Luke, p. 2345.


Assuntos
Melanoma , Segunda Neoplasia Primária , Humanos , Estudos Retrospectivos , Receptor de Morte Celular Programada 1/imunologia , Melanoma/patologia , Antígeno CTLA-4/imunologia , Resultado do Tratamento , Macrófagos/metabolismo , Microambiente Tumoral
8.
JACS Au ; 2(10): 2251-2258, 2022 Oct 24.
Artigo em Inglês | MEDLINE | ID: mdl-36311836

RESUMO

Amino-polyols represent attractive chemical building blocks but can be challenging to synthesize because of the high density of asymmetric functionalities and the need for extensive protecting-group strategies. Here we present a three-component strategy for the stereoselective enzymatic synthesis of amino-diols and amino-polyols using a diverse set of prochiral aldehydes, hydroxy ketones, and amines as starting materials. We were able to combine biocatalytic aldol reactions, using variants of d-fructose-6-phosphate aldolase (FSA), with reductive aminations catalyzed by IRED-259, identified from a metagenomic library. A two-step process, without the need for intermediate isolation, was developed to avoid cross-reactivity of the carbonyl components. Stereoselective formation of the 2R,3R,4R enantiomers of amino-polyols was observed and confirmed by X-ray crystallography.

9.
Clin Cancer Res ; 28(21): 4677-4688, 2022 11 01.
Artigo em Inglês | MEDLINE | ID: mdl-36044477

RESUMO

PURPOSE: The tumor immune microenvironment impacts the biological behavior of the tumor, but its effect on clinical outcomes in head and neck cutaneous squamous cell carcinomas (HNcSCC) is largely unknown. EXPERIMENTAL DESIGN: We compared the immune milieu of high-risk HNcSCC that never progressed to metastasis with those that metastasized using multiparameter imaging mass cytometry. The cohort included both immunosuppressed patients (IS) and patients with an absence of clinical immune-suppression (ACIS). Spatial analyses were used to identify cellular interactions that were associated with tumor behavior. RESULTS: Nonprogressing primary HNcSCC were characterized by higher CD8+ and CD4+ T-cell responses, including numerically increased regulatory T cells. In contrast, primary lesions from HNcSCC patients who progressed were largely devoid of T cells with lower numbers of innate immune cells and increased expression of checkpoint receptors and in the metastatic lesions were characterized by an accumulation of B cells. Spatial analysis reveals multiple cellular interactions associated with nonprogressing primary tumors that were distinct in primary tumors of disease-progressing patients. Cellular regional analysis of the tumor microenvironment also shows squamous cell-enriched tumor regions associated with primary nonprogressing tumors. CONCLUSIONS: Effective responses from both CD8+ and CD4+ T cells in the tumor microenvironment are essential for immune control of primary HNcSCC. Our findings indicate that the early events that shape the immune responses in primary tumors dictate progression and disease outcomes in HNcSCC.


Assuntos
Carcinoma de Células Escamosas , Neoplasias de Cabeça e Pescoço , Neoplasias Cutâneas , Humanos , Carcinoma de Células Escamosas/patologia , Neoplasias Cutâneas/patologia , Carcinoma de Células Escamosas de Cabeça e Pescoço , Microambiente Tumoral , Análise Espacial
10.
JCI Insight ; 7(21)2022 11 08.
Artigo em Inglês | MEDLINE | ID: mdl-36173679

RESUMO

Immune-related adverse events represent a major hurdle to the success of immunotherapy. The immunological mechanisms underlying their development and relation to antitumor responses are poorly understood. By examining both systemic and tissue-specific immune changes induced by combination anti-CTLA-4 and anti-PD-1 immunotherapy, we found distinct repertoire changes in patients who developed moderate-severe colitis, irrespective of their antitumor response to therapy. The proportion of circulating monocytes were significantly increased at baseline in patients who subsequently developed colitis compared with patients who did not develop colitis, and biopsies from patients with colitis showed monocytic infiltration of both endoscopically and histopathologically normal and inflamed regions of colon. The magnitude of systemic expansion of T cells following commencement of immunotherapy was also greater in patients who developed colitis. Importantly, we show expansion of specific T cell subsets within inflamed regions of the colon, including tissue-resident memory CD8+ T cells and Th1 CD4+ T cells in patients who developed colitis. Our data also suggest that CD8+ T cell expansion was locally induced, while Th1 cell expansion was systemic. Together, our data show that exaggerated innate and T cell responses to combination immunotherapy synergize to propel colitis in susceptible patients.


Assuntos
Colite , Receptor de Morte Celular Programada 1 , Humanos , Linfócitos T CD8-Positivos , Imunoterapia/efeitos adversos , Colite/induzido quimicamente , Colite/terapia , Fatores Imunológicos , Imunidade Inata
11.
Front Cardiovasc Med ; 8: 670841, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34141729

RESUMO

Congenital abnormalities in girls and women with Turner syndrome (TS), alongside an underlying predisposition to obesity and hypertension, contribute to an increased risk of cardiovascular disease and ultimately reduced life expectancy. We observe that children with TS present a greater variance in aortic arch morphology than their healthy counterparts, and hypothesize that their hemodynamics is also different. In this study, computational fluid dynamic (CFD) simulations were performed for four TS girls, and three age-matched healthy girls, using patient-specific inlet boundary conditions, obtained from phase-contrast MRI data. The visualization of multidirectional blood flow revealed an increase in vortical flow in the arch, supra-aortic vessels, and descending aorta, and a correlation between the presence of aortic abnormalities and disturbed flow. Compared to the relatively homogeneous pattern of time-averaged wall shear stress (TAWSS) on the healthy aortae, a highly heterogeneous distribution with elevated TAWSS values was observed in the TS geometries. Visualization of further shear stress parameters, such as oscillatory shear index (OSI), normalized relative residence time (RRTn), and transverse WSS (transWSS), revealed dissimilar heterogeneity in the oscillatory and multidirectional nature of the aortic flow. Taking into account the young age of our TS cohort (average age 13 ± 2 years) and their obesity level (75% were obese or overweight), which is believed to accelerate the initiation and progression of endothelial dysfunction, these findings may be an indication of atherosclerotic disease manifesting earlier in life in TS patients. Age, obesity and aortic morphology may, therefore, play a key role in assessing cardiovascular risk in TS children.

12.
Clin Med (Lond) ; 21(4): e384-e391, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-34103378

RESUMO

BACKGROUND: The COVID-19 pandemic has strained healthcare systems and how best to address post-COVID health needs is uncertain. Here we describe the post-COVID symptoms of 675 patients followed up using a virtual review pathway, stratified by severity of acute COVID infection. METHODS: COVID-19 survivors completed an online/telephone questionnaire of symptoms after 12+ weeks and a chest X-ray. Dependent on findings at virtual review, patients were provided information leaflets, attended for investigations and/or were reviewed face-to-face. Outcomes were compared between patients following high-risk and low-risk admissions for COVID pneumonia, and community referrals. RESULTS: Patients reviewed after hospitalisation for COVID pneumonia had a median of two ongoing physical health symptoms post-COVID. The most common was fatigue (50.3% of high-risk patients). Symptom burden did not vary significantly by severity of hospitalised COVID pneumonia but was highest in community referrals. Symptoms suggestive of depression, anxiety and post-traumatic stress disorder were common (depression occurred in 24.9% of high-risk patients). Asynchronous virtual review facilitated triage of patients at highest need of face-to-face review. CONCLUSION: Many patients continue to have a significant burden of post-COVID symptoms irrespective of severity of initial pneumonia. How best to assess and manage long COVID will be of major importance over the next few years.


Assuntos
COVID-19 , COVID-19/complicações , Seguimentos , Humanos , Pandemias , SARS-CoV-2 , Síndrome de COVID-19 Pós-Aguda
13.
Soc Sci Med ; 68(4): 664-71, 2009 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-19110361

RESUMO

A sense of belonging or attachment to place is believed to help maintain a sense of identity and well-being, and to facilitate successful adjustments in old age. Older people in particular have been shown to draw meaning and security from the places in which they live. Qualitative data from multiple conversational interviews held over the period of a year with each of 83 community-dwelling older people in Auckland within the context of a study conducted from 2006 to 2008 are interpreted to explore how older people relate to their social and physical environments, with a specific focus on attachment to place and the meaning of home. The concept of 'social space' is proposed, to capture the elastic physical, imaginative, emotional and symbolic experiences of and connections to people and place across time and in scope. Talking with older people themselves gave a rich account of attachment to place, social spaces, and well-being. Our participants had strong attachments to their homes and neighbourhoods, extensive participation in 'beyond spaces', and shrinking social worlds. They did not, however necessarily view changes as negative; instead there was a delicate negotiation of positive and negative aspects, and complex engagement with 'social space' as a profoundly meaningful construct.


Assuntos
Idoso/fisiologia , Características de Residência , Apoio Social , Adaptação Psicológica , Idoso de 80 Anos ou mais , Feminino , Humanos , Entrevistas como Assunto , Masculino , Nova Zelândia , Ensaios Clínicos Controlados Aleatórios como Assunto
14.
Clin Cancer Res ; 25(11): 3247-3258, 2019 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-30777877

RESUMO

PURPOSE: Immunotherapies targeting costimulating and coinhibitory checkpoint receptors beyond PD-1 and CTLA-4 have entered clinical trials. Little is known about the relative abundance, coexpression, and immune cells enriched for each specific drug target, limiting understanding of the biological basis of potential treatment outcomes and development of predictive biomarkers for personalized immunotherapy. We sought to assess the abundance of checkpoint receptors during melanoma disease progression and identify immune cells enriched for them.Experimental Design: Multiplex immunofluorescence staining for immune checkpoint receptors (ICOS, GITR, OX40, PD-1, TIM-3, VISTA) was performed on 96 melanoma biopsies from 41 treatment-naïve patients, including patient-matched primary tumors, nodal metastases, and distant metastases. Mass cytometry was conducted on tumor dissociates from 18 treatment-naïve melanoma metastases to explore immune subsets enriched for checkpoint receptors. RESULTS: A small subset of tumor-infiltrating leukocytes expressed checkpoint receptors at any stage of melanoma disease. GITR and OX40 were the least abundant checkpoint receptors, with <1% of intratumoral T cells expressing either marker. ICOS, PD-1, TIM-3, and VISTA were most abundant, with TIM-3 and VISTA mostly expressed on non-T cells, and TIM-3 enriched on dendritic cells. Tumor-resident T cells (CD69+/CD103+/CD8+) were enriched for TIGIT (>70%) and other coinhibitory but not costimulatory receptors. The proportion of GITR+ T cells decreased from primary melanoma (>5%) to lymph node (<1%, P = 0.04) and distant metastases (<1%, P = 0.0005). CONCLUSIONS: This study provides the first comprehensive assessment of immune checkpoint receptor expression in any cancer and provides important data for rational selection of targets for trials and predictive biomarker development.


Assuntos
Antineoplásicos Imunológicos/farmacologia , Biomarcadores Tumorais , Imunomodulação , Melanoma/metabolismo , Antineoplásicos Imunológicos/uso terapêutico , Biópsia , Humanos , Imuno-Histoquímica , Imunomodulação/efeitos dos fármacos , Imunofenotipagem , Leucócitos/efeitos dos fármacos , Leucócitos/imunologia , Leucócitos/metabolismo , Estudos Longitudinais , Melanoma/diagnóstico , Melanoma/tratamento farmacológico , Linfócitos T/efeitos dos fármacos , Linfócitos T/imunologia , Linfócitos T/metabolismo
15.
ChemCatChem ; 10(17): 3736-3745, 2018 Sep 07.
Artigo em Inglês | MEDLINE | ID: mdl-30333895

RESUMO

Fungal ferulic acid decarboxylases (FDCs) belong to the UbiD-family of enzymes and catalyse the reversible (de)carboxylation of cinnamic acid derivatives through the use of a prenylated flavin cofactor. The latter is synthesised by the flavin prenyltransferase UbiX. Herein, we demonstrate the applicability of FDC/UbiX expressing cells for both isolated enzyme and whole-cell biocatalysis. FDCs exhibit high activity with total turnover numbers (TTN) of up to 55000 and turnover frequency (TOF) of up to 370 min-1. Co-solvent compatibility studies revealed FDC's tolerance to some organic solvents up 20 % v/v. Using the in-vitro (de)carboxylase activity of holo-FDC as well as whole-cell biocatalysts, we performed a substrate profiling study of three FDCs, providing insights into structural determinants of activity. FDCs display broad substrate tolerance towards a wide range of acrylic acid derivatives bearing (hetero)cyclic or olefinic substituents at C3 affording conversions of up to >99 %. The synthetic utility of FDCs was demonstrated by a preparative-scale decarboxylation.

16.
Environ Health Perspect ; 115(5): 787-91, 2007 May.
Artigo em Inglês | MEDLINE | ID: mdl-17520069

RESUMO

CONTEXT: There is little evidence linking adverse reproductive effects to exposure to specific pesticides during pregnancy. CASE PRESENTATION: In February 2005, three infants with congenital anomalies were identified in Collier County, Florida, who were born within 8 weeks of one another and whose mothers worked for the same tomato grower. The mothers worked on the grower's Florida farms in 2004 before transferring to its North Carolina farms. All three worked during the period of organogenesis in fields recently treated with several pesticides. The Florida and North Carolina farms were inspected by regulatory agencies, and in each state a large number of violations were identified and record fines were levied. DISCUSSION: Despite the suggestive evidence, a causal link could not be established between pesticide exposures and the birth defects in the three infants. Nonetheless, the prenatal pesticide exposures experienced by the mothers of the three infants is cause for concern. Farmworkers need greater protections against pesticides. These include increased efforts to publicize and comply with both the U.S. Environmental Protections Agency's Worker Protection Standard and pesticide label requirements, enhanced procedures to ensure pesticide applicator competency, and recommendations to growers to adopt work practices to reduce pesticide exposures. RELEVANCE TO PROFESSIONAL PRACTICE: The findings from this report reinforce the need to reduce pesticide exposures among farmworkers. In addition, they support the need for epidemiologic studies to examine the role of pesticide exposure in the etiology of congenital anomalies.


Assuntos
Agricultura/legislação & jurisprudência , Anormalidades Congênitas/etiologia , Exposição Ocupacional/efeitos adversos , Praguicidas/toxicidade , Agricultura/métodos , Análise por Conglomerados , Feminino , Florida , Humanos , Recém-Nascido , Masculino , North Carolina
17.
J Med Chem ; 49(23): 6660-71, 2006 Nov 16.
Artigo em Inglês | MEDLINE | ID: mdl-17154497

RESUMO

A multivariate analysis of drugs on the Swedish market was the basis for the selection of a small, physicochemically diverse set of 24 drug compounds. Factors such as structural diversity, commercial availability, price, and a suitable analytical technique for quantification were considered in the selection. Lipophilicity, pKa, solubility, and permeability across human Caco-2 cell monolayers were measured for the compiled data set. The results show that, by use of a physicochemically diverse data set, experimental responses over a wide range were obtained. The paper also shows how experimental difficulties due to the diversity of the data set can be overcome. We anticipate that this data set can serve as a benchmark set for validation of new experimental techniques or in silico models. It can also be used as a diverse starting data set for the development of new computational models.


Assuntos
Desenho de Fármacos , Preparações Farmacêuticas/química , Células CACO-2 , Permeabilidade da Membrana Celular , Química Farmacêutica , Cromatografia Líquida/métodos , Humanos , Concentração de Íons de Hidrogênio , Íons , Estrutura Molecular , Análise Multivariada , Preparações Farmacêuticas/metabolismo , Farmacocinética , Solubilidade , Espectrofotometria Ultravioleta
18.
BMJ Support Palliat Care ; 6(4): 445-451, 2016 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27118370

RESUMO

BACKGROUND: The financial impact of family caregiving in a palliative care context has been identified as an issue which requires further research. However, little is known about how research should be conducted in this area. OBJECTIVE: The aim of this study was to explore the opinions of family caregivers in New Zealand regarding the need to conduct research relating to the financial costs of family caregiving and to explore their perspectives on acceptable and feasible methods of data collection. METHODS: A qualitative study design was adopted. Semistructured interviews were conducted with 30 family caregivers who were either currently caring for a person with palliative care needs or had done so in the past year. RESULTS: All participants felt that research relating to the costs of family caregiving within a palliative care context was important. There was little consensus regarding the most appropriate methods of data collection and administration. Online methods were preferred by many participants, although face-to-face methods were particularly favoured by Ma¯ori participants. Both questionnaires and cost diaries were felt to have strengths and weaknesses. CONCLUSIONS: Prospective longitudinal designs are likely to be most appropriate for future research, in order to capture variations in costs over time. The lack of consensus for a single preferred method makes it difficult to formulate specific recommendations regarding methods of data collection; providing participants with options for methods of completion may therefore be appropriate.


Assuntos
Cuidadores/economia , Efeitos Psicossociais da Doença , Cuidados Paliativos/economia , Pesquisa , Adulto , Idoso , Coleta de Dados , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Nova Zelândia , Pesquisa Qualitativa , Adulto Jovem
19.
J Am Geriatr Soc ; 53(2): 331-5, 2005 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-15673361

RESUMO

This article describes a longitudinal study developed to assess perceived usefulness of a mandatory geriatric clerkship from the perspective of junior students completing the newly initiated program in 1998-1999 and 1999-2000 and these same students as second- or third-year residents. End-of-clerkship student evaluations were compared with follow-up resident surveys of those same students to identify the utility of information provided and strengths and weaknesses of the initial course experience. Students participated in hospice, outpatient clinics, nursing homes, and transitional care venues during their clerkship experience at the Donald W. Reynolds Department of Geriatrics, College of Medicine, University of Arkansas for Medical Sciences. Two hundred eighty-five student evaluations were collected, and 143 resident surveys were returned. Quantitative and qualitative data from students and residents corroborated each other in identifying strengths and weaknesses of the clerkship. Hospice information was successfully incorporated into residency practice. In contrast, outpatient clinic, nursing home, and transitional care segments of the clerkship were perceived as inadequate. Survey responses validated faculty changes that were initiated in the following years. These changes use settings and patients that more accurately mirror those seen in typical resident encounters.


Assuntos
Estágio Clínico , Geriatria/educação , Satisfação Pessoal , Estudantes de Medicina/psicologia , Adulto , Feminino , Humanos , Internato e Residência , Estudos Longitudinais , Masculino , Avaliação de Programas e Projetos de Saúde , Fatores de Tempo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA