Search results for "reserva"

Monitoring water quality and hydrological patterns of wetlands using recent techniques in remote sensing

2017

Los humedales aportan una gran cantidad de servicios ecosistémicos, incluyendo la regulación del ciclo hidrológico para el control de inundaciones y la sequía. También proporcionan suministro de agua, refugios de vida silvestre, y oportunidades de recreación, entre otros. A pesar de que estas áreas tienen un valor fundamental para el desarrollo sostenible, se ven totalmente afectadas por el crecimiento urbano, la extensión de tierras agrícolas y la contaminación derivada de todo ello. La calidad de las aguas y el estado ecológico de los ecosistemas acuáticos se pueden ver deteriorados por el proceso de eutrofización. Éste produce cambios físicos, químicos y biológicos en la masa de agua. Pa…

Programa Lluna: talleres de sexo y consumo más seguro en el medio penitenciario (1995-2001)

2002

En el trabajo se expone someramente un programa educativo para la prevención del VIH/Sida consistente en una oferta anual de talleres sobre sexo y consumo de drogas que ha ido evolucionando con buenos resultados y en donde, se basan distintos grupos de autoayuda según características de practica sexual parejas, hombres/mujeres solos. hetero/homosexuales). En este programa intervienen distintos colaboradores profesionales. voluntarios. y los mediadores surgidos y formados en el mismo medio penitenciario, estos últimos de probada eficacia. Los cambios de actitudes en las relaciones humanas y las medidas profilácticas básicas, son la base del mismo. Se exponen los contenidos de los talleres, t…

Why do results conflict regarding the prognostic value of the methylation status in colon cancers? The role of the preservation method.

2012

Abstract Background In colorectal carcinoma, extensive gene promoter hypermethylation is called the CpG island methylator phenotype (CIMP). Explaining why studies on CIMP and survival yield conflicting results is essential. Most experiments to measure DNA methylation rely on the sodium bisulfite conversion of unmethylated cytosines into uracils. No study has evaluated the performance of bisulfite conversion and methylation levels from matched cryo-preserved and Formalin-Fixed Paraffin Embedded (FFPE) samples using pyrosequencing. Methods Couples of matched cryo-preserved and FFPE samples from 40 colon adenocarcinomas were analyzed. Rates of bisulfite conversion and levels of methylation of …

Survey of Fertility Preservation Options Available to Patients With Cancer Around the Globe

2020

Purpose Oncofertility focuses on providing fertility and endocrine-sparing options to patients who undergo life-preserving but gonadotoxic cancer treatment. The resources needed to meet patient demand often are fragmented along disciplinary lines. We quantify assets and gaps in oncofertility care on a global scale. Methods Survey-based questionnaires were provided to 191 members of the Oncofertility Consortium Global Partners Network, a National Institutes of Health–funded organization. Responses were analyzed to measure trends and regional subtleties about patient oncofertility experiences and to analyze barriers to care at sites that provide oncofertility services. Results Sixty-three res…

Survey of third-party parenting options associated with fertility preservation available to patients with cancer around the globe

2018

Purpose In the accompanying article, “Survey of Fertility Preservation Options Available to Patients With Cancer Around the Globe,” we showed that specific fertility preservation services may not be offered at various sites around the world because of cultural and legal barriers. We assessed global and regional experiences as well as the legal status of third-party reproduction and adoption to serve as a comprehensive international data set and resource for groups that wish to begin oncofertility interventions. Methods We provide data on the legalities of third-party assisted reproductive technologies and other family-building options in the 28 oncofertility-practicing countries surveyed. R…

Cryopreservation of Escherichia coli K12TG1: Protection from the damaging effects of supercooling by freezing

2015

Injuries in living cells caused by water freezing during a freeze-thaw process have been extensively reported. In particular, intracellular water freezing has long been incriminated in cell death caused by a high cooling rate, but this supposition could not always be demonstrated. This work aims to discriminate the role of water freezing, dehydration and cold-induced injuries in cellular damage occuring during cryopreservation. For this purpose, Escherichia coli K12TG1 suspensions were maintained in a supercooled or frozen state at -20°C for times ranging from 10 min to 5 h. The supercooled state was maintained for a long period at -20°C by applying a non-injurious isostatic pressure (P<40 …

Present status of the application of cryopreserved hepatocytes in the evaluation of xenobiotics: consensus of an international expert panel.

1999

Successful cryopreservation of freshly isolated hepatocytes would significantly decrease the need for freshly-procured livers for the preparation of hepatocytes for experimentation. Hepatocytes can be prepared, cryopreserved, and used for experimentation as needed at different times after isolation. Cryopreservation is especially important for research with human hepatocytes because of the limited availability of fresh human livers. Based on the cumulative experience of this international expert panel, a consensus was reached on the various aspects of hepatocyte cryopreservation, including cryopreservation and thawingprocedures and applications of the cryopreserved hepatocytes. Key to succe…

Destruction of Kupffer’s cells increases total liver blood flow and decreases ischemia reperfusion injury in pigs

2000

Experimental Investigation on Water Loss and Stiffness of CBTM Using Different RA Sources

2021

Cold recycling of reclaimed asphalt (RA) is a promising technique to build or to maintain roads, combining performance and environmental advantages. Although this technique has been extensively used worldwide, there is no unique and internationally-shared method to characterize cold recycled mixtures. The previous work of the RILEM TC 237-SIB TG6 successfully attempted to characterize different RA sources with both traditional parameters (gradation, bitumen content and geometrical properties) and non-conventional properties (fragmentation and strength testing). The current RILEM TC 264-RAP TG1 mainly focuses on the influence of different RA sources on physical and mechanical characteristics…

Fluorescence, Browning Index, and Color in Infant Formulas during Storage

2005

Free and total fluorescent compounds, browning index, and color formation were measured in milk-based powdered infant formulas (IF) during 2 years of storage at 20 and 37 degrees C. The excitation spectra from 415 nm emission show three peaks (ex lambda1 = 270 nm, lambda2 = 325/315 nm, lambda3 = 350 nm) and from 347 nm excitation two emission peaks (415 and 520 nm), and no wavelength shifts were observed. Temperature and time of storage exert in general no significant effect on the development of fluorescence emission intensity and browning index. However, an important increase in pentodilysine was recorded-probably because of the iron and ascorbic acid contents of the samples-as well as in…