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An isopiestic experimental facility for the measurement of vapor pressures has been designed, fabricated, and commissioned. Using the vapor pressure data as a function of temperature, useful thermodynamic properties of alloys and compounds of interest can be derived. The isopiestic facility comprises a pair of furnaces, temperature controllers, thermocouple movement mechanism, user interface, and data collection. Four such experimental setups have been commissioned. This experimental facility is useful to determine the vapor pressures of a volatile component over the condensed phases as a function of temperature and composition. Using the vapor pressure data, the thermodynamic properties of various systems can be determined. The experimental setup was validated by a Pr-Cd isopiestic run, and the results are compared with the data reported in the literature.
RESUMEN
OBJECTIVE: Intussusception has been linked with rotavirus vaccine (RVV) as a rare adverse reaction. In view of limited background data on intussusception in India and in preparation for RVV introduction, a surveillance network was established to document the epidemiology of intussusception cases in Indian children. METHODS: Intussusception in children 2-23 months were documented at 19 nationally representative sentinel hospitals through a retrospective surveillance for 69 months (July 2010 to March 2016). For each case clinical, hospital course, treatment and outcome data were collected. RESULTS: Among the 1588 intussusception cases, 54.5% were from South India and 66.3% were boys. The median age was 8 months (IQR 6, 12) with 34.6% aged 2-6 months. Seasonal variation with higher cases were documented during March-June period. The most common symptoms and signs were vomiting (63.4%), bloody stool (49.1%), abdominal pain (46.9%) and excessive crying (42.8%). The classical triad (vomiting, abdominal pain, and blood in stools) was observed in 25.6% cases. 96.4% cases were diagnosed by ultrasound with ileocolic location as the commonest (85.3%). Management was done by reduction (50.8%) and surgery (41.1%) and only 1% of the patients' died. 91.1% cases met Brighton criteria level 1 and 3.3% Level 2. Between 2010 and 2015, the case load and case ratio increased across all regions. CONCLUSION: Intussusception cases have occurred in children across all parts of the country, with low case fatality in the settings studied. The progressive rise cases could indicate an increasing awareness and availability of diagnostic facilities.
Asunto(s)
Intususcepción , Vacunas contra Rotavirus , Niño , Preescolar , Humanos , India/epidemiología , Lactante , Intususcepción/epidemiología , Masculino , Estudios Retrospectivos , Vacunas contra Rotavirus/efectos adversos , Centros de Atención TerciariaRESUMEN
The presence of a CD133+/nestin+ population in brain tumors suggests that a normal neural stem cell may be the cell of origin for gliomas. We have identified human CD133-positive NSCs from adult glioma tissue and established them as long-term in vitro cultures human neuroglial culture (HNGC)-1. Replicative senescence in HNGC-1 led to a high level of genomic instability and emergence of a spontaneously immortalized clone that developed into cell line HNGC-2 with features of cancer stem cells (CSCs), which include the ability for self-renewal and the capacity to form CD133-positive neurospheres and develop intracranial tumors. The data from our study specify an important role of genomic instability in initiation of transformed state as well as its progression into highly tumorigenic CSCs. The activated forms of Notch and Hes isoforms were expressed in both non-neoplastic neural stem cells and brain tumor stem cells derived from it. Importantly, a significant overexpression of these molecules was found in the brain tumor stem cells. These findings suggest that this model comprised of HNGC-1 and HNGC-2 cells would be a useful system for studying pathways involved in self-renewal of stem cells and their transformation to cancer stem cells. Disclosure of potential conflicts of interest is found at the end of this article.