Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 85
Filtrar
Mais filtros

Base de dados
País/Região como assunto
Tipo de documento
Intervalo de ano de publicação
1.
Osteoporos Int ; 27(10): 3121-5, 2016 10.
Artigo em Inglês | MEDLINE | ID: mdl-27129455

RESUMO

UNLABELLED: Mutations of the CYP24A1 gene can result in hypercalcemia, hyerpercalciuria, and nephrolithiasis, but disease severity is variable. Clinical and biochemical phenotypes were correlated with gene sequence information in a family with two CYP24A1 mutations. A gene dose effect was apparent with monoallelic mutations demonstrating milder disease manifestations than biallelic mutations. INTRODUCTION: The objective was to examine the spectrum of clinical and biochemical phenotypes in a family with monoallelic and biallelic mutations of CYP24A1 after identification of the proband with two mutations of the CYP24A1 gene: (A) p.R396W and (B) E143del-Het. METHODS: Clinical and biochemical phenotypes were correlated with CYP24A1 sequence information in the proband and four siblings, a daughter, and two nieces of the proband. The subjects' medical histories were evaluated, and measurement of serum minerals, vitamin D metabolites, PTH, bone turnover markers, and urinary calcium and sequencing of the CYP24A1 gene were performed. RESULTS: The proband had nephrolithiasis, osteopenia, hypercalcemia, hypercalciuria, elevated serum 1,25(OH)2D, undetectable 24,25(OH)2D, and inappropriately low PTH concentrations. Two subjects with biallelic (A/B) mutations had nephrolithiasis, marked hypercalciuria (583 ± 127 mg/24 h, mean ± SD), compared with five subjects with monoallelic mutations (A or B) with a urine calcium of 265 ± 85 mg/24 h. Two subjects with monoallelic mutations had nephrolithiasis and one had non-PTH dependent hypercalcemia. Five subjects had high 1,25(OH)2D measurements, including three with monoallelic mutations. The 25OHD/24,25(OH)2D ratio, in subjects with biallelic mutations was 291 versus 19.8 in the subjects with monoallelic mutations. CONCLUSIONS: In this family, adults with CYP24A1 mutations a gene dose effect is apparent: subjects with biallelic, compound heterozygous mutations (A/B) have a more severe clinical and biochemical phenotype, whereas, subjects with monoallelic mutations demonstrate milder disease manifestations which are not easily characterized through biochemical assessment.


Assuntos
Dosagem de Genes , Fenótipo , Vitamina D3 24-Hidroxilase/genética , Adulto , Idoso , Alelos , Doenças Ósseas Metabólicas/genética , Cálcio/urina , Saúde da Família , Feminino , Humanos , Hipercalcemia/genética , Hipercalciúria/genética , Masculino , Pessoa de Meia-Idade , Mutação , Nefrolitíase/genética , Linhagem , Vitamina D/sangue
2.
Osteoporos Int ; 26(5): 1655-60, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-25572049

RESUMO

UNLABELLED: Substantial variability exists in the serum 25(OH)D increase observed in response to vitamin D supplementation. Measurement of circulating cholecalciferol and 24,25(OH)2D, as indicators of vitamin D absorption and degradation, respectively, account for approximately half of the variation in serum 25(OH)D observed following supplementation. INTRODUCTION: Vitamin D supplementation produces a variable response in serum 25(OH)D. This variability likely reflects, in part, differences in vitamin D absorption and/or degradation. Despite this variation in response, virtually all expert recommendations endorse a fixed vitamin D supplementation dose, an approach also used in most prospective studies. Such utilization of a single vitamin D dose does not assure attaining any pre-specified target 25(OH)D level, thereby compromising clinical care and prospective supplementation trials. This study begins addressing this weakness by exploring the feasibility of vitamin D metabolite measurements to predict serum 25(OH)D level attained following supplementation. METHODS: Ninety-one community-dwelling postmenopausal women with baseline 25(OH)D of 10-30 ng/mL received oral vitamin D3, 2300 or 2500 IU, daily for 4-6 months. Serum 25(OH)D, cholecalciferol (D3), and 24,25(OH)2D were measured before and at the end of supplementation to determine if metabolite concentrations allow prediction of the 25(OH)D level attained. RESULTS: From baseline and follow-up data, we derived a multiple linear regression model predicting posttreatment 25(OH)D as follows: final 25(OH)D = 8.3 + (1.05*initial 25(OH)D) - (7.7*initial 24,25(OH)2D) + (0.53*final D3) + (4.2*final 24,25(OH)2D). This model has an adjusted R(2) = 0.55, thus accounting for approximately half of the observed variance in the final 25(OH)D level. CONCLUSIONS: The contributions of circulating cholecalciferol and 24,25(OH)2D to this predictive model can be considered as indicators of intestinal absorption and clearance, respectively. This paradigm requires further study; it may allow efficient "treat-to-25(OH)D-target" strategies useful in optimizing prospective studies and clinical practice.


Assuntos
Conservadores da Densidade Óssea/uso terapêutico , Colecalciferol/uso terapêutico , Suplementos Nutricionais , Osteoporose Pós-Menopausa/tratamento farmacológico , 24,25-Di-Hidroxivitamina D 3/sangue , Idoso , Monitoramento de Medicamentos/métodos , Feminino , Seguimentos , Humanos , Pessoa de Meia-Idade , Osteoporose Pós-Menopausa/sangue , Vitamina D/análogos & derivados , Vitamina D/sangue
3.
Theor Appl Genet ; 128(6): 1117-36, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25835560

RESUMO

KEY MESSAGE: This paper describes methods for unlocking genetic treasure from wild perennial Glycine species of Australia for soybean improvement. The genetic resources of the ca. 26 species of the genus Glycine subgenus Glycine have not been exploited to broaden the genetic base of soybean (Glycine max; 2n = 40). The objectives of this study were to develop methods for producing F1, amphidiploid, BC1, BC2, BC3, and fertile soybean plants from crosses of soybean and the genus Glycine subgenus Glycine species, in order to utilize the subgenus Glycine germplasm in soybean breeding. Soybean cultivars were hybridized with six accessions of 78-chromosome G. tomentella as well as one accession each of 40-chromosome G. tomentella, G. argyrea and G. latifolia. They were chosen because they exhibit resistance to soybean rust. We were successful in producing fertile soybean from soybean cv. 'Dwight' and 78-chromosome G. tomentella accession PI 441001, while other hybrids were discontinued either at F1 or amphidiploid stage. The F1 seeds aborted prior to reaching maturity, so developing seeds from 19 to 21 day old pods were cultured aseptically in various media formulations. Seed maturation and multiple embryo generation media were developed. F1 plants with shoots and roots (2n = 59) were transplanted to pots in greenhouse. Amphidiploid (2n = 118) plants were backcrossed to 'Dwight'. BC1 (2n = 79) plants were propagated through in vitro and 43 mature BC2F1 seeds were harvested. Fifteen surviving BC2F1 plants were morphologically distinct, sterile, and had chromosome numbers ranging 2n = 56-59. Chromosome numbers of the BC3F1 plants ranged 2n = 40-49. Derived fertile soybeans were first planted in the field in 2008 and are being evaluated for yield, resistance to pathogens and pests and tolerance to salt through material transfer agreement.


Assuntos
Cruzamento , Quimera/genética , Glycine max/genética , Hibridização Genética , Austrália , Cromossomos de Plantas , Pool Gênico
4.
Hum Reprod ; 29(12): 2764-72, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25336708

RESUMO

STUDY QUESTION: Are there abnormalities in gonadotrophin secretion, adrenal steroidogenesis and/or testicular steroidogenesis in brothers of women with polycystic ovary syndrome (PCOS)? SUMMARY ANSWER: Brothers of women with PCOS have increased gonadotrophin responses to gonadotrophin releasing hormone (GnRH) agonist stimulation and alterations in adrenal and gonadal steroidogenesis. WHAT IS KNOWN ALREADY: PCOS is a complex genetic disease. Male as well as female first-degree relatives have reproductive features of the syndrome. We previously reported that brothers of affected women have elevated circulating dehydroepiandrosterone sulfate levels. STUDY DESIGN, SIZE, DURATION: This was a case-control study performed in 29 non-Hispanic white brothers of 22 women with PCOS and 18 control men. PARTICIPANTS/MATERIALS, SETTING, METHODS: PCOS brothers and control men were of comparable age, weight and ethnicity. Adrenocorticotrophic hormone (ACTH) and GnRH agonist stimulation tests were performed. Gonadotrophin responses to GnRH agonist as well as changes in precursor-product steroid pairs (delta, Δ) across steroidogenic pathways in response to ACTH and GnRH agonist were examined. MAIN RESULTS AND THE ROLE OF CHANCE: Basal total (T) levels did not differ, but dehydroepiandrosterone (DHEA) levels (0.13 ± 0.08 brothers versus 0.22 ± 0.09 controls, nmol/l, P = 0.03) were lower in brothers compared with control men. ACTH-stimulated Δ17-hydroxypregnenolone (17Preg)/Δ17-hydroxyprogesterone (17Prog) (7.8 ± 24.2 brothers versus 18.9 ± 21.3 controls, P = 0.04) and ΔDHEA/Δandrostenedione (AD) (0.10 ± 0.05 brothers versus 0.14 ± 0.08 controls, P = 0.04) were lower in brothers than in the controls. GnRH agonist-stimulated Δ17Prog/ΔAD (0.28 ± 8.47 brothers versus 4.79 ± 10.28 controls, P = 0.003) was decreased and luteinizing hormone (38.6 ± 20.6 brothers versus 26.0 ± 9.8 controls, IU/l, P = 0.02), follicle-stimulating hormone (10.2 ± 7.5 brothers versus 4.8 ± 4.1 controls, IU/l P = 0.002), AD (1.7 ± 1.4 brothers versus 0.9 ± 1.5 controls, nmol/l, P = 0.02) and ΔAD/ΔT (0.16 ± 0.14 brothers versus 0.08 ± 0.12 controls, P = 0.005) responses were increased in brothers compared with controls. LIMITATIONS, REASONS FOR CAUTION: The modest sample size may have limited our ability to observe other possible differences in steroidogenesis between PCOS brothers and control men. WIDER IMPLICATIONS OF THE FINDINGS: Decreased ACTH-stimulated Δ17Preg/Δ17Prog and ΔDHEA/ΔAD responses suggested increased adrenal 3ß-hydroxysteroid dehydrogenase activity in the brothers. Decreased Δ17Prog/ΔAD and increased ΔAD/ΔT responses to GnRH agonist stimulation suggested increased gonadal 17,20-lyase and decreased gonadal 17ß-hydroxysteroid dehydrogenase activity in the brothers. Increased LH and FSH responses to GnRH agonist stimulation suggested neuroendocrine alterations in the regulation of gonadotrophin secretion similar to those in their proband sisters. These changes in PCOS brothers may reflect the impact of PCOS susceptibility genes and/or programming effects of the intrauterine environment. STUDY FUNDING/COMPETING INTERESTS: This research was supported by P50 HD044405 (A.D.), K12 HD055884 (L.C.T.), U54 HD034449 (A.D., R.S.L.) from the National Institute of Child Health and Development. Some hormone assays were performed at the University of Virginia Center for Research in Reproduction Ligand Assay and Analysis Core that is supported by U54 HD28934 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development. Partial support for some of the clinical studies was provided by UL1 RR025741 and UL1 TR000150 (Northwestern University Clinical and Translational Sciences Institute) from the National Center for Research Resources, National Institutes of Health, which is now the National Center for Advancing Translational Sciences. The authors have no conflict of interest to declare.


Assuntos
Gonadotropinas/sangue , Síndrome do Ovário Policístico , Esteroides/sangue , 17-alfa-Hidroxipregnenolona/sangue , 17-alfa-Hidroxiprogesterona/sangue , Adolescente , Adulto , Androstenodiona/sangue , Estudos de Casos e Controles , Cortodoxona/sangue , Sulfato de Desidroepiandrosterona/sangue , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Irmãos
5.
Appl Radiat Isot ; 212: 111445, 2024 Jul 14.
Artigo em Inglês | MEDLINE | ID: mdl-39013329

RESUMO

For the first time, charge distribution studies have been carried out in the epi-cadmium neutron induced fission of 235U by measuring the fractional cumulative yields (FCY) and independent yields (IY) of various fission products. An off-line γ-ray spectrometric technique was used for the measurements. The average energy of the epi-cadmium neutron spectrum is 1.9 MeV. From the FCY values, the isobaric width parameter (σZ), most probable charge (ZP) and the charge polarization (ΔΖEXPT) as a function of fragment mass were obtained. Similarly, from the IY values, isotopic width parameter (σA), the most probable mass (AP) and the elemental yields (YZ) of Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce and Pr were determined by using a non-linear fit. From the YZ values, the proton even-odd effect (δp) was obtained for the first time. The present data in the 235U(n, f) reaction were compared with the similar data in the 235U(nth, f) and 238U(n, f) reactions as well as of other actinides to examine the role of excitation energy and pairing effect.

6.
Appl Radiat Isot ; 211: 111414, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-38925035

RESUMO

Measurement of independent isomeric yield ratios (IR) of 128,130,132Sb, 131,133Te, 132.134,136I, 135Xe and 138Cs have been carried out for the first time in the epi-cadmium neutron induced fission of 239Pu by using an off-line gamma-ray spectrometric technique. The average neutron energy () of the epi-cadmium reactor neutron spectrum is 1.9 MeV. From the IR values, root mean square fragment angular momenta (JRMS) were deduced by using spin dependent statistical model analysis. Effect of nuclear structure on JRMS values was examined. The present data in the epi-cadmium neutron induced fission of 239Pu were compared with the similar data in the thermal neutron induced fission of 239Pu to examine the role of excitation energy on JRMS values.

7.
Appl Radiat Isot ; 208: 111304, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38522264

RESUMO

The independent isomeric yield ratios (IR) of 128,130,132Sb, 131,133Te, 132,134,136I, 135Xe and 138Cs have been measured in the epi-cadmium neutron induced fission of 233U by using an off-line gamma-ray spectrometric technique. The average neutron energy of the epi-cadmium reactor neutron spectrum is 1.9 MeV. The root mean square fragment angular momenta (JRMS) were deduced from the IR values by using spin dependent statistical model analysis. The IR and JRMS values of considered fission products in the epi-cadmium neutron induced fission of 233U were compared with the literature data in the thermal neutron induced fission of 233U to examine the influence of excitation energy on nuclear structure effect.

8.
Appl Radiat Isot ; 209: 111312, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38603865

RESUMO

Studies on charge distribution have been carried out in the epi-cadmium neutron induced fission of 238Pu for the first time. Experimentally fractional cumulative yields (FCY) and independent yields (IY) of various fission products have been measured by using an off-line γ-ray spectrometric technique. From the FCY values, the charge distribution parameters such as the isobaric width parameter (σZ), most probable charge (ZP) and the charge polarization (ΔΖEXPT) as a function of fragment mass were obtained. On the other hand, from the measured IY values, isotopic width parameter (σA), the most probable mass (AP) and the elemental yields (YZ) of Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce and Pr were determined by using a non-linear fit. From the YZ values, the proton even-odd effect (δp) was obtained for the first time. The isobaric and isotopic charge distribution parameters in the 238Pu(nf, f) reaction were compared with the similar data in the thermal neutron induced fission of 238Pu and other actinides to examine the role of excitation energy.

9.
Med J Armed Forces India ; 68(4): 360-5, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-24532905

RESUMO

BACKGROUND: Data show that naval personnel have a high incidence of stress related disorders. A high prevalence of occupational stress was seen in a previous survey carried out on Indian Naval personnel. However, the role of social support in reducing occupational stress was not studied. To study occupational stress in Indian Naval personnel and to study the effect of social support on occupational stress. METHODS: 5077 naval personnel were surveyed using study questionnaires which included Occupational Stress Inventory, Multidimensional Scale of Perceived Social Support, and the General Health Questionnaire (GHQ)-12 item version as a measure of psychological health. The data was statistically analysed using chi square test and other non-parametric tests. RESULTS: High occupational stress was seen in personnel serving afloat (66.47%) as compared to those serving ashore (51.55%) and on submarines (53.72%). Among personnel serving afloat, occupational stress was highest among Junior Sailors as compared to Senior Sailors and Officers. Occupational stress was linked to poor psychological health as measured by the GHQ and younger age. Perceived social support was effective in reducing occupational stress in Officers and Senior Sailors but not in Junior Sailors where paradoxically it seemed to lead to greater occupational stress. CONCLUSIONS: High occupational stress was seen in more than half the service personnel studied. Occupational stress is mitigated by social support in Officers and Senior Sailors but not in Junior Sailors.

10.
Eur Respir J ; 37(2): 238-43, 2011 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-20595151

RESUMO

Low blood vitamin D levels have been postulated to be a risk factor for worse lung function, based largely on cross-sectional data. We sought to use longitudinal data to test the hypothesis that baseline plasma 25-hydroxyvitamin D (25(OH)D) is lower in subjects with more rapid lung function decline, compared to those with slow lung function decline. We conducted a nested, matched case-control study in the Lung Health Study 3 cohort. Cases and controls were continuous smokers with rapid and slow lung function decline, respectively, over ~6 yrs of follow-up. We compared baseline 25(OH)D levels between cases and controls, matching date of phlebotomy and clinical centre. Among 196 subjects, despite rapid and slow decliners experiencing strikingly and significantly different rates of decline of forced expiratory volume in 1 s (-152 versus -0.3 mL·yr⁻¹; p < 0.001), there was no significant difference in baseline 25(OH)D levels (25.0 versus 25.9 ng·mL⁻¹; p = 0.54). There was a high prevalence of vitamin D insufficiency (35%) and deficiency (31%); only 4% had a normal 25(OH)D level in the winter. Although vitamin D insufficiency and deficiency are common among continuous smokers with established mild-to-moderate chronic obstructive pulmonary disease, baseline 25(OH)D levels are not predictive of subsequent lung function decline.


Assuntos
Pulmão/fisiopatologia , Vitamina D/análogos & derivados , Estudos de Casos e Controles , Feminino , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Prevalência , Doença Pulmonar Obstrutiva Crônica/sangue , Doença Pulmonar Obstrutiva Crônica/epidemiologia , Testes de Função Respiratória , Fumar/epidemiologia , Vitamina D/sangue , Deficiência de Vitamina D/sangue
11.
Osteoporos Int ; 19(10): 1465-71, 2008 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-18338096

RESUMO

UNLABELLED: In men, measurement of serum testosterone and estradiol levels with immunoassays correlated with mass spectroscopic measurements, and correlations of sex steroids with volumetric bone mineral density were similar. INTRODUCTION: While immunoassays have been used extensively for measurement of serum testosterone (T) and estradiol (E(2)) levels, there is concern about their specificity, particularly at low E(2) levels as present in men. METHODS: We compared T and E(2) measured by mass spectroscopy to levels measured by immunoassay in men (n = 313, age 22 to 91 years) and related these to volumetric bone mineral density (vBMD) at various skeletal sites. RESULTS: Serum T and non-SHBG bound (or bioavailable) T levels by immunoassay correlated well with the corresponding mass spectroscopy measurements (R = 0.90 and 0.95, respectively, P < 0.001); the correlations for serum E(2) measured using the two techniques were less robust (R = 0.63 for total E(2) and 0.84 for bioavailable E(2), P < 0.001). Overall relationships between serum bioavailable T and E(2) levels with vBMD at various skeletal sites were similar for the immunoassay and mass spectroscopic measures. CONCLUSIONS: Although E(2) levels with immunoassay correlate less well with the mass spectroscopic measurements than do the T measurements in men, our findings indicate that the fundamental relationships observed previously between vBMD and the sex steroids by immunoassay are also present with the mass spectroscopic measurements.


Assuntos
Densidade Óssea/fisiologia , Estradiol/sangue , Testosterona/sangue , Adulto , Idoso , Envelhecimento/sangue , Envelhecimento/fisiologia , Colo do Fêmur/fisiologia , Humanos , Masculino , Espectrometria de Massas/métodos , Pessoa de Meia-Idade , Radioimunoensaio/métodos , Rádio (Anatomia)/fisiologia , Reprodutibilidade dos Testes , Tíbia/fisiologia
12.
Int J Tuberc Lung Dis ; 22(7): 807-812, 2018 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-29914607

RESUMO

SETTING: Despite overwhelming evidence for the association between tuberculosis (TB) and tobacco use, it remains neglected in the context of policy, planning and practice. There is limited evidence about the extent of integration of TB and tobacco control programmes in South-East Asia Region (SEAR) countries. OBJECTIVE: To assess the level of TB-tobacco integration in 11 SEAR countries. DESIGN: Cross-sectional study using a structured questionnaire addressed to TB and tobacco focal points at the World Health Organization Country Offices. RESULTS: Apart from India, no country in the SEAR has a formal coordination mechanism for national TB and tobacco control programmes or a system of referral for tobacco users among TB patients for treatment of tobacco dependence. There is no joint planning, joint training or joint supervision and monitoring in any country. CONCLUSION: There is poor integration between TB and tobacco control programmes in most SEAR countries. This assessment fed into the development of a regional framework for TB-tobacco integration, which outlines three strategies: 1) integrated patient-centred care and prevention; 2) joint TB tobacco actions covering policy development, planning, training and monitoring; and 3) research and innovation. Every country in the region should adopt the TB-tobacco integration framework to improve programme performance.


Assuntos
Política de Saúde , Tabagismo/prevenção & controle , Uso de Tabaco/prevenção & controle , Tuberculose/prevenção & controle , Sudeste Asiático , Estudos Transversais , Humanos , Assistência Centrada no Paciente/organização & administração , Desenvolvimento de Programas , Inquéritos e Questionários
13.
J Hazard Mater ; 145(1-2): 221-6, 2007 Jun 25.
Artigo em Inglês | MEDLINE | ID: mdl-17140730

RESUMO

Zinc is used in various metallurgical, chemical and textile industries. In textile industries, waste effluent containing zinc is generated during the manufacture of rayon yarn. Due to the strict environmental regulations and the presence of toxic metallic and other constituents, the discharge of effluents in sewage is restricted. In view of above a process has been developed for the recovery of zinc from rayon waste effluent following solvent extraction technique using thiophosphinic extractants Cyanex 272 and 302. Before recycling of zinc sulphate solution in spinning bath, solution must be free from calcium, which is deleterious to the process as gypsum precipitates and forms scale. The extractant Cyanex 302 has been found selective for the recovery of 99.99% of zinc in the form of [R(2)Zn](org) from the effluent above equilibrium pH 3.4 maintaining the O/A ratio of 1/30 leaving all the calcium in the raffinate. The zinc from the loaded Cyanex 302 can be stripped with 10% sulphuric acid at even O/A ratio of 10. The stripped solution thus obtained could be recycled in the spinning bath of the rayon plant and raffinate could be disposed safely without affecting environment.


Assuntos
Cálcio/isolamento & purificação , Celulose , Resíduos Industriais/análise , Compostos Organotiofosforados/química , Ácidos Fosfínicos/química , Têxteis , Poluentes Químicos da Água/isolamento & purificação , Zinco/isolamento & purificação , Concentração de Íons de Hidrogênio
15.
Neurogastroenterol Motil ; 28(7): 1114-9, 2016 07.
Artigo em Inglês | MEDLINE | ID: mdl-26914765

RESUMO

BACKGROUND: Gastrointestinal (GI) and non-GI disorders are associated with altered intestinal permeability, which can be measured in vivo by urinary excretion after oral lactulose and mannitol ingestion. Inadvertent dietary consumption of (12) Carbon ((12) C, regular) mannitol in food or from other sources may interfere with the test's interpretation. (13) Carbon ((13) C) constitutes 1% of carbon in nature and (13) C mannitol is a stable isotope. Our aim was to determine the performance of (13) C mannitol for measurement of intestinal permeability. METHODS: Ten healthy volunteers underwent intestinal permeability assay using coadministered (12) C mannitol, (13) C mannitol and lactulose, followed by timed urine collections. Urinary sugar concentrations were measured using tandem high performance liquid chromatography-mass spectrometry. KEY RESULTS: We found that (13) C mannitol can be distinguishable from (12) C mannitol on tandem mass spectrometry. In addition, (13) C mannitol had ~20-fold lower baseline contamination compared to (12) C mannitol. We describe here the (13) C mannitol assay method for the measurement of intestinal permeability. CONCLUSIONS & INFERENCES: In conclusion, (13) C mannitol is superior to (12) C mannitol for measurement of intestinal permeability. It avoids issues with baseline contamination and erratic excretions during the testing period.


Assuntos
Isótopos de Carbono/metabolismo , Isótopos de Carbono/urina , Absorção Intestinal/fisiologia , Manitol/metabolismo , Manitol/urina , Biomarcadores/metabolismo , Biomarcadores/urina , Isótopos de Carbono/administração & dosagem , Humanos , Absorção Intestinal/efeitos dos fármacos , Mucosa Intestinal/efeitos dos fármacos , Mucosa Intestinal/metabolismo , Masculino , Manitol/administração & dosagem , Pessoa de Meia-Idade , Permeabilidade/efeitos dos fármacos , Espectrometria de Massas em Tandem/métodos
16.
Biochim Biophys Acta ; 1201(3): 437-41, 1994 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-7803474

RESUMO

The physical and chemical interaction of nitric oxide (NO) with stable nitroxides have been studied in both aqueous and membrane environments. The ESR spectrum of 3-carbamoyl-2,2,5,5-tetramethyl-3-pyrroline-1- yloxy (CTPO) was observed to broaden upon exposure to NO. This effect can be explained by invoking Heisenberg spin exchange as has been previously reported for molecular oxygen. No loss of total spin was observed negating the possibility of a chemical reaction between NO and CTPO. The extent of signal broadening was proportional to the concentration of NO and can thus be used to monitor NO concentration. We have used this method to observe the partitioning of NO into model membranes. We also report the use of multiquantum ESR to detect directly the effects of NO on the membrane bound spin label 12-doxylstearic acid. This methodology may prove useful for detecting NO in both aqueous and lipid environments and for examining the physical properties of NO within biological membranes.


Assuntos
Óxido Nítrico/química , Óxidos N-Cíclicos , Espectroscopia de Ressonância de Spin Eletrônica , Lipossomos/química , Óxido Nítrico/análise
17.
Genetics ; 107(1): 141-63, 1984 May.
Artigo em Inglês | MEDLINE | ID: mdl-17246212

RESUMO

Twelve primary trisomics of Oryza sativa L. were isolated from the progenies of spontaneous triploids and were transferred by backcrossing to the genetic background of IR36, a widely grown high yielding rice variety. Eleven trisomics can be identified morphologically from one another and from diploids. However, triplo 11 is difficult to distinguish from diploid sibs.-The extra chromosome of each trisomic was identified cytologically at pachytene stage of meiosis, and the chromosomes were numbered according to their length at this stage. The major distinguishing features of each pachytene chromosome were redescribed.-The female transmission rates varied from 15.5% for triplo 1, the longest chromosome, to 43.9% for triplo 12, the shortest chromosome. Seven of the 12 primary trisomics transmitted the extra chromosome through the male. The low level of chromosomal imbalance tolerated by rice and other evidence are interpreted to indicate that this species is a basic diploid.-Genetic segregation for 22 marker genes in the trisomic progenies was studied. Of a possible 264 combinations, involving 22 genes and 12 trisomics, 120 were examined. Marker genes for each of the 12 chromosomes were identified. The results helped establish associations between linkage groups and cytologically identifiable chromosomes of rice for the first time. Relationships between various systems of numbering chromosomes, trisomics, linkage groups and marker genes are described, and a revised linkage map of rice is presented.

18.
Int J Tuberc Lung Dis ; 9(1): 61-8, 2005 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-15675552

RESUMO

SETTING: Governmental health facilities in six districts of India. OBJECTIVE: To estimate the prevalence of cough and to compare the detection of smear-positive tuberculosis (TB) among out-patients with cough of > or =2 or > or =3 weeks. DESIGN: Trained health workers questioned each out-patient for presence of cough. Those with cough > or =2 weeks underwent sputum microscopy. RESULTS: Of 55561 out-patients interviewed, 2210 (4%) had cough > or =2 weeks, of whom 267 had sputum-positive TB, compared to 182/1370 with cough > or =3 weeks. The 31% who did not spontaneously complain of cough were less likely to be sputum-positive than those who did (45/680 [7%] vs. 222/1530 [15%], P < 0.001), but they accounted for 45/267 smear-positive cases. Using cough > or =2 weeks as the screening criterion, the estimated number of smears performed per day at each primary and secondary health care facility was respectively 8 and 19, compared to 5 and 12 using cough > or =3 weeks. CONCLUSION: The detection of smear-positive TB cases can be substantially improved by actively eliciting history of cough from all out-patients, and by changing the screening criterion for performing sputum microscopy among out-patients from cough > or =3 weeks to > or =2 weeks. Before implementing this change nationally, its programmatic feasibility should be assessed.


Assuntos
Tosse/etiologia , Programas de Rastreamento , Tuberculose Pulmonar/complicações , Tuberculose Pulmonar/diagnóstico , Adolescente , Adulto , Idoso , Diagnóstico Diferencial , Feminino , Inquéritos Epidemiológicos , Humanos , Índia , Masculino , Pessoa de Meia-Idade , Pacientes Ambulatoriais , Sensibilidade e Especificidade , Escarro/microbiologia , Fatores de Tempo
19.
Indian J Cancer ; 52(4): 685-8, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26960519

RESUMO

BACKGROUND: National Tobacco Control Programme was launched in India in year 2007-08. It was realized that community health workers can play an important role of agents for positive change to bring down the tobacco morbidity and mortality in the country. Keeping this in view, a health worker guide was developed by the Government of India, Ministry of Health and Family Welfare (GOI) in collaboration with The Union South-East Asia (The Union) in the year 2010. The guide provides the information needed by the most basic level of health workers to effectively address the problem of tobacco use in the community. A modular training was conducted in two jurisdictions in India (namely, Chandigarh and Hamirpur (Himachal Pradesh)) to assess the usefulness of the guide as training material for community health workers in undertaking tobacco control activities at community and village levels. MATERIALS AND METHODS: A total of 271 participants were trained, which included 133 from Chandigarh and 138 from Hamirpur. The pre and post-training assessment of knowledge of health worker was done. RESULTS: There was marked increase in post-test scores as compared to the pretest scores. The health workers scoring more than 60% increased from 40% in the pretest to over 80% in the post-test. Only three workers had a post-test score of less than 30% against 54 workers in the pretest. CONCLUSION: The understanding on tobacco control had increased significantly after the training in each group. It is strongly recommended that such training should be replicated to all community health workers across all the states in India.


Assuntos
Agentes Comunitários de Saúde/educação , Abandono do Hábito de Fumar/métodos , Uso de Tabaco/prevenção & controle , Agentes Comunitários de Saúde/normas , Feminino , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Índia , Masculino
20.
Public Health Action ; 5(1): 6-16, 2015 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-26400596

RESUMO

In 2009, the International Union Against Tuberculosis and Lung Disease (The Union) and Médecins Sans Frontières (MSF) jointly developed a new paradigm for operational research (OR) capacity building and started a new process of appointing and supporting OR fellows in the field. This case study describes 1) the appointment of two OR fellows in The Union South-East Asia Office (USEA), New Delhi, India; 2) how this led to the development of an OR unit in that organisation; 3) achievements over the 5-year period from June 2009 to June 2014; and 4) challenges and lessons learnt. In June 2009, the first OR fellow in India was appointed on a full-time basis and the second was appointed in February 2012-both had limited previous experience in OR. From 2009 to 2014, annual research output and capacity building initiatives rose exponentially, and included 1) facilitation at 61 OR training courses/modules; 2) publication of 96 papers, several of which had a lasting impact on national policy and practice; 3) providing technical assistance in promoting OR; 4) building the capacity of medical college professionals in data management; 5) support to programme staff for disseminating their research findings; 6) reviewing 28 scientific papers for national or international peer-reviewed journals; and 7) developing 45 scientific abstracts for presentation at national and international conferences. The reasons for this success are highlighted along with ongoing challenges. This experience from India provides good evidence for promoting similar models elsewhere.


En 2009, L'Union Internationale contre la Tuberculose et les Maladies respiratoires (L'Union) et Médecins Sans Frontières (MSF) ont élaboré conjointement un nouveau paradigme de renforcement des capacités en recherche opérationnelle et démarré un nouveau processus de recrutement et de soutien de chercheurs en recherche opérationnelle sur le terrain. Cette étude de cas décrit 1) le recrutement de deux chercheurs en recherche opérationnelle dans le bureau de l'Union du Sud-est asiatique (USEA), à New Delhi, Inde ; 2) comment ceci a abouti à l'élaboration d'une unité de recherche opérationnelle dans cette organisation ; 3) les accomplissements sur une période de cinq ans de juin 2009 à juin 2014 ; et 4) les défis et les leçons apprises. En juin 2009, le premier chercheur en recherche opérationnelle (OR) en Inde a été recruté à temps plein et le deuxième a été recruté en février 2012­les deux chercheurs avaient une expérience préalable limitée en OR. De 2009 à 2014, les résultats annuels de la recherche et les initiatives de renforcement des capacités se sont accrues de façon exponentielle et ont inclus : 1) la facilitation de 61 cours/modules de formation à la OR ; 2) la publication de 96 articles, dont plusieurs ont eu un impact durable sur la politique et les pratiques nationales ; 3) la fourniture d'assistance technique à la promotion de l'OR ; 4) un renforcement des capacités des professionnels du collège médical dans la gestion des données ; 5) un soutien au personnel du programme dans la diffusion des résultats de leur recherche ; 6) une revue de 28 articles scientifiques pour les journaux nationaux or internationaux revus par leurs pairs ; et 7) l'élaboration de 45 résumés scientifiques destinés à être présentés lors de conférences nationales et internationales. Les raisons de ce succès sont mises en lumière en même temps que les défis persistants. Cette expérience émanant d'Inde offre des données suffisantes pour promouvoir des modèles similaires ailleurs.


En el 2009, la Unión Internacional contra la Tuberculosis y las Enfermedades Respiratorias (La Unión) y Médicos Sin Fronteras establecieron de manera conjunta un nuevo paradigma de fortalecimiento de la capacidad de practicar la investigación operativa (OR) y pusieron en marcha nuevos mecanismos de nombramiento de los becarios de OR y de respaldo a esta actividad en el terreno. En el presente estudio de casos se describen los siguientes aspectos: 1) el nombramiento de dos becarios de OR en la oficina de La Unión para la Región del Sudeste Asiático de Nueva Delhi en India; 2) la manera como este nombramiento condujo a la creación de una unidad de OR en esta organización; 3) los logros alcanzados durante un período de 5 años entre junio de 2009 y junio del 2014; y 4) las dificultades y las enseñanzas extraídas. En junio del 2009 se nombró el primer becario con dedicación exclusiva a la OR en la India y el segundo nombramiento tuvo lugar en febrero del 2012; ambos investigadores contaban con poca experiencia en esta esfera. Del 2009 al 2014, la producción científica anual y las iniciativas de fortalecimiento de la capacidad investigativa aumentaron de manera exponencial; se pusieron en marcha las siguientes actividades: 1) la facilitación en 61 cursos o módulos de capacitación en OR; 2) la publicación de 96 artículos científicos, algunos de los cuales tuvieron una repercusión duradera en las políticas y las prácticas a escala nacional; 3) la prestación de asistencia técnica encaminada a fomentar la OR; 4) el reforzamiento de la capacidad de gestión de los datos, dirigido a los profesionales de la facultad de medicina; 5) el respaldo a la difusión de los resultados de las investigaciones del personal del programa; 6) la evaluación de 28 artículos científicos para revistas con comité de lectura nacionales e internacionales; y 7) la elaboración de 45 resúmenes científicos que se presentaron en conferencias nacionales e internacionales. En el presente artículo se destacan las razones del éxito de esta iniciativa y las dificultades actuales del proyecto. Esta experiencia en la India aporta datos convincentes en favor de la promoción de modelos similares en otros entornos.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA