Search for Dark Photon Dark Matter in the Mass Range 74-110 µeV with a Cryogenic Millimeter-Wave Receiver.

We search for the dark photon dark matter (DPDM) using a cryogenic millimeter-wave receiver. DPDM has a kinetic coupling with electromagnetic fields with a coupling constant of χ and is converted into ordinary photons at the surface of a metal plate. We search for signal of this conversion in the frequency range 18-26.5 GHz, which corresponds to the mass range 74-110 µeV/c^{2}. We observed no significant signal excess, allowing us to set an upper bound of χ<(0.3-2.0)×10^{-10} at 95% confidence level. This is the most stringent constraint to date and tighter than cosmological constraints. Improvements from previous studies are obtained by employing a cryogenic optical path and a fast spectrometer.

Recomendación para disminuir el riesgo de colapso súbito e inesperado posnatal / Guidance to reduce the risk of Sudden and Unexpected Postnatal Collapse

El contacto piel a piel al nacer (COPAP) entre madres y recién nacidos a término sanos es fundamental en los estándares de la Iniciativa Hospital Amigo de la Madre y el Niño de Unicef. El COPAP inmediatamente después del nacimiento favorece la estabilidad cardiorrespiratoria, la prevalencia y duración de la lactancia materna y el vínculo madre-hijo, y disminuye el estrés materno. Existe preocupación por los casos de colapso súbito inesperado posnatal durante el COPAP con el bebé en decúbito prono sobre el torso desnudo materno. Si bien es infrecuente, evoluciona en el 50 % de los casos como evento grave de aparente amenaza a la vida y la otra mitad fallece (muerte súbita e inesperada neonatal temprana). Durante el COPAP y, al menos, las primeras 2 horas después del parto, el personal de Sala de Partos y recuperación debe observar y evaluar cualquier parámetro que implique una descompensación del bebé.

Early skin-to-skin contact (SSC) between mothers and healthy term newborns is a key part of the Unicef Baby Friendly Initiative Standards. SSC immediately after birth provides cardio-respiratory stability, improves prevalence and duration of breastfeeding, improves maternal-infant bonding and decreases maternal stress. There is a concern about cases of sudden unexpected postnatal collapse during a period of SSC with the infant prone on the mother ́s chest. Said collapse includes both severe apparent life-threatening event and sudden unexpected early neonatal death in the first week of life. Even if considered rare, consequences are serious with death in half of the cases and remaining disability in majority of the cases reported. For these reasons during SSC and for at least the first 2 hours after delivery, health care personnel in the delivery and recovery room should observe and assess for any sign of decompensation in the infant

Distribution of the carbohydrate antigens, DU-PAN-2 and CA19-9, in tumors of the lung.

AIMS AND BACKGROUND: The carbohydrate chains of malignant cells appear to be related to oncofetal differentiation. The serum levels of CA19-9 have been reported to be evaluated in some patients with lung carcinomas, however, the distribution of carbohydrate antigens were not precisely described. We have investigated in this study the distribution of DU-PAN-2 and CA19-9 antigens in lung tumors. METHODS: Ninety five specimens of lung tumors were selected from surgical specimens. The expression of DU-PAN-2 and CA19-9 were studied by immunohystochemical techniques. The relationship between the expression of these antigens and the classification or the differentiation degree of the tumors were examined. RESULTS: DU-PAN-2 or CA19-9 antigens were detected in 41 (54%) and 45 (59%) cases of the 76 malignant epithelial tumors investigated. These antigens were detected in all types of malignant epithelial tumors, including squamous cell carcinomas, where they were mainly localized to the entire cell surface of malignant cells. In adenocarcinomas, large cell carcinomas and small cell carcinomas, however, these antigens were commonly detected both on the cell membrane and in the cytoplasm. There was positive correlation between the degree of differentiation and DU-PAN-2, but not CA19-9 expression. Among the non-epithelial tumors investigated, those antigens were detected in pulmonary blastomas but not in mesotheliomas. CONCLUSIONS: Immunohistochemical studies for DU-PAN-2 and CA19-9 are useful for defining characteristics of the lung tumors. DU-PAN-2 could be a marker for differentiating between malignant epithelial tumors and mesotheliomas.