RESUMEN
BACKGROUND: At least two rounds of the Global Youth Tobacco Survey (GYTS) have been completed in most of the countries in the World Health Organization South‑East Asia region. Comparing findings from these two rounds provides trend data on smokeless tobacco (SLT) use for the first time. METHODS: This study uses GYTS data from Bangladesh, Bhutan, India, Indonesia, Maldives, Myanmar, Nepal, Sri Lanka, Thailand, and Timor‑Leste during 2006–2013. GYTS is a nationally representative survey of 13–15‑year‑old students using a consistent and standard protocol. Current SLT use is defined as using any kind of SLT products, such as chewing betel quid or nonbetel quid or snuffing any other products orally or through the nasal route, during the 30 days preceding the survey. Prevalence and 95% confidence intervals were computed using SAS/SUDAAN software. RESULTS: According to most recent GYTS data available in each country, the prevalence of current use of SLT among youth varied from 5.7% in Thailand to 23.2% in Bhutan; among boys, from 7.1% in Bangladesh to 27.2% in Bhutan; and among girls, from 3.7% in Bangladesh to 19.8% in Bhutan. Prevalence of SLT was reported significantly higher among boys than girls in Bhutan (boys 27.2%; girls 19.8%), India (boys 11.1%; girls 6.0%), Maldives (boys 9.2%; girls 2.9%), Myanmar (boys 15.2%; girls 4.0%), and Sri Lanka (boys 13.0%; girls 4.1%). Prevalence of current SLT use increased in Bhutan from 9.4% in 2009 to 23.2% in 2013, and in Nepal from 6.1% in 2007 to 16.2% in 2011. CONCLUSION: The findings call for countries to implement corrective measures through strengthened policy and enforcement.
Asunto(s)
Adolescente , Asia , Femenino , Humanos , Masculino , Tabaco sin Humo/etiología , Tabaco sin Humo/estadística & datos numéricos , Organización Mundial de la SaludRESUMEN
Fast atom bombardment mass spectrometry (FAB MS) enables the rapid, accurate and sensitive determination of the molecular masses of glycosylphosphatidylinositol(GPI)-derived oligosaccharides, from which the composition in terms of monosaccharide residues and non-carbohydrate substituents can be determined. Interpretation of fragment ions in collisional activation mass spectra further enables the determination of residue sequence, the positions of branch points, and the location of non-carbohydrate substituents. We have applied these techniques to the characterization of phosphoinositol oligosaccharides from Leptomonas samueli, Endotrypanum schaudinni and Leishmania adleri. The mass spectral data permit the postulation of candidate structures for the oligosaccharides, which provide a set of constraints that can assist the interpretation of results from other techniques such as NMR
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Fosfatidilinositoles/química , Glucolípidos/química , Oligosacáridos/química , Espectrometría de Masa Bombardeada por Átomos Veloces , Trypanosomatina/química , Secuencia de Carbohidratos , Datos de Secuencia MolecularRESUMEN
Glycoinositolphospholipids (GIPLs) were extracted from the trypanosomatid Leishmania adleri by hot phenol extraction and the carbohydrate moieties isolated after base cleavage. Purification of the crude oligosaccharides by high performance anion exchange (HPAE) chromatography yielded four fractions whose structures were determined by a combination of methylation analysis, fast atom bombardment (FAB) mass spectrometry and two-dimensional nuclear magnetic resonance (NMR) spectroscopy
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Animales , Glicoesfingolípidos/química , Oligosacáridos/química , Espectrometría de Masa Bombardeada por Átomos Veloces , Trypanosomatina/química , Secuencia de Carbohidratos , Glicoesfingolípidos/aislamiento & purificación , Datos de Secuencia Molecular , Oligosacáridos/aislamiento & purificación , Espectroscopía de Resonancia MagnéticaRESUMEN
Nuclear magnetic resonance (NMR) spectroscopy provides an extremely powerful technique to determine the structure of oligosaccharides, particularly when used in conjuction with other physical techniques such as methylation analysis and fast atom bombardment mass spectroscopy (FAB-MS). This brief review describes the application of NMR to the determination of the structure of an oligosaccharide isolated from the glycophosphosphingolipid (GPS) from the monogenetic trypanosomatid Leptomonas samueli. Where ambiguities arise in the NMR interpretation, the use of other data will be discussed
Asunto(s)
Animales , Glicoesfingolípidos/química , Oligosacáridos/química , Espectroscopía de Resonancia Magnética , Trypanosomatina/química , Secuencia de Carbohidratos , Glicoesfingolípidos/aislamiento & purificación , Fosfatos de Inositol/análisis , Datos de Secuencia Molecular , Oligosacáridos/aislamiento & purificación , Espectrometría de Masa Bombardeada por Átomos VelocesRESUMEN
This brief contains information on the explicit and implicit population policies of the Government. The purpose of the brief is to enable the reader to analyze the current policy situation on the basis of the latest available information about the population issues of greatest concern