Gestación gemelar con feto acárdico: Presentación de un caso

Normal 0 21 false false false ES X-NONE X-NONE Introducción: la secuencia de perfusión arterial reversa (secuencia TRAP) o transfusión feto-fetal; se encuentra entre las numerosas peculiaridades de la gestación monocoriónica (univitelina) gemelar. En ella, el gemelo afectado es perfundido de forma reversa mediante anastomosis arterio-arterial y veno-venosa por el otro gemelo; resultando un feto acardio y otro normal, con consecuencias hemodinámicas en este último, debidas a la misma. Objetivo: caso de embarazo gemelar monocigótico con feto acardio-acéfalo diagnosticado por ultrasonido preparto; dada su baja frecuencia. Presentación del caso: gestante de 17 años de edad, primigrávida, con embarazo gemelar de 36.3 semanas, diagnosticado por Ultrasonido (US); con 4 controles prenatales. La misma consultó en trabajo de parto. Se le realizó un US evolutivo que encontró un feto vivo, en presentación cefálica, acompañado de una masa amorfa, que se concluyó como feto malformado en un embarazo gemelar. Se remitió la gestante al Hospital Nacional Regional de Escuintla (HNRE); donde se le practicó una cesárea; se obtuvo un recién nacido femenino de 2.37 kilogramos y una masa deforme (feto malformado). La placenta resultó ser monocoriónica, univitelina, con perfusión sanguínea feto-fetal (de normal a malformado); lo cual permitió la supervivencia del feto amorfo hasta entonces, seguido de muerte fetal intraparto. El gemelo malformado se envió al servicio de anatomía patológica para su estudio; cuyos resultados se presentan en este trabajo. Se revisa la bibliografía hasta el 2013. Conclusiones: el feto acardio-acéfalo por transfusión feto-fetal inversa es poco frecuente en nuestro país, debido al temprano y avanzado control prenatal. El diagnóstico prenatal temprano es un método valioso para evitar el desenlace fatal e incremento de la mortalidad infantil. Palabras clave: Feto acardio-acéfalo, mielocéfato, embarazo gemelar. Acardius, gestación múltiple, síndrome de transfusión feto-fetal. <!--[endif] --

The VOrtex Ring Transit EXperiment (VORTEX) GAS project

Get Away Special (GAS) payload G-093, also called VORTEX (VOrtex Ring Transit EXperiment), is an investigation of the propagation of a vortex ring through a liquid-gas interface in microgravity. This process results in the formation of one or more liquid droplets similar to earth based liquid atomization systems. In the absence of gravity, surface tension effects dominate the drop formation process. The Shuttle's microgravity environment allows the study of the same fluid atomization processes as using a larger drop size than is possible on Earth. This enables detailed experimental studies of the complex flow processes encountered in liquid atomization systems. With VORTEX, deformations in both the vortex ring and the fluid surface will be measured closely for the first time in a parameters range that accurately resembles liquid atomization. The experimental apparatus will record images of the interactions for analysis after the payload has been returned to earth. The current design of the VORTEX payload consists of a fluid test cell with a vortex ring generator, digital imaging system, laser illumination system, computer based controller, batteries for payload power, and an array of housekeeping and payload monitoring sensors. It is a self-contained experiment and will be flown on board the Space Shuttle in a 5 cubic feet GAS canister. The VORTEX Project is entirely run by students at the University of Michigan but is overseen by a faculty advisor acting as the payload customer and the contact person with NASA. This paper summarizes both the technical and programmatic aspects of the VORTEX Project

Anomaly in the dielectric response at the charge orbital ordering transition of crystalline Pr0.67Ca0.33MnO3

The complex impedance of a Pr0.67Ca0.33MnO3 crystal has been measured. The frequency dependence is studied for a wide range of temperatures (50K-403K) and is found to be characteristic of relaxation process with a single Debye time relaxation constant, which is interpreted as a dielectric constant of the material. A strong peak is observed in this dielectric constant (up to two millions) at the charge ordering transition suggesting an interpretation in terms of ordering of electric dipoles at TCO or in term of phase separation. Comparison with Pr0.63Ca0.37MnO3 - in which the phase separation is much smaller and the peak in the dielectric constant is absent - suggests an interpretation in term of phase separation between insulating and metallic states.Comment: pdf fil

Disruption of Yarrowia lipolytica TPS1 Gene Encoding Trehalose-6-P Synthase Does Not Affect Growth in Glucose but Impairs Growth at High Temperature

We have cloned the Yarrowia lipolytica TPS1 gene encoding trehalose-6-P synthase by complementation of the lack of growth in glucose of a Saccharomyces cerevisiae tps1 mutant. Disruption of YlTPS1 could only be achieved with a cassette placed in the 3′half of its coding region due to the overlap of its sequence with the promoter of the essential gene YlTFC1. The Yltps1 mutant grew in glucose although the Y. lipolytica hexokinase is extremely sensitive to inhibition by trehalose-6-P. The presence of a glucokinase, insensitive to trehalose-6-P, that constitutes about 80% of the glucose phosphorylating capacity during growth in glucose may account for the growth phenotype. Trehalose content was below 1 nmol/mg dry weight in Y. lipolytica, but it increased in strains expressing YlTPS1 under the control of the YlTEF1promoter or with a disruption of YALI0D15598 encoding a putative trehalase. mRNA levels of YlTPS1 were low and did not respond to thermal stresses, but that of YlTPS2 (YALI0D14476) and YlTPS3 (YALI0E31086) increased 4 and 6 times, repectively, by heat treatment. Disruption of YlTPS1 drastically slowed growth at 35°C. Homozygous Yltps1 diploids showed a decreased sporulation frequency that was ascribed to the low level of YALI0D20966 mRNA an homolog of the S. cerevisiae MCK1 which encodes a protein kinase that activates early meiotic gene expression

intellectual capital in crisis time: the case of Russia&quot;

The data pick up information about intellectual capital investments in Russian companies between 2004 and 2014

Leadership and human capital in small business

It is a database of a survey in 2018 in the forest industry of Misiones in Argentine