Search results for "DAS"
showing 10 items of 4164 documents
Experimental Sentinel-2 LAI estimation using parametric, non-parametric and physical retrieval methods – A comparison
2015
Abstract Given the forthcoming availability of Sentinel-2 (S2) images, this paper provides a systematic comparison of retrieval accuracy and processing speed of a multitude of parametric, non-parametric and physically-based retrieval methods using simulated S2 data. An experimental field dataset (SPARC), collected at the agricultural site of Barrax (Spain), was used to evaluate different retrieval methods on their ability to estimate leaf area index (LAI). With regard to parametric methods, all possible band combinations for several two-band and three-band index formulations and a linear regression fitting function have been evaluated. From a set of over ten thousand indices evaluated, the …
On the moments of Cochran's Q statistic under the null hypothesis, with application to the meta-analysis of risk difference.
2011
W. G. Cochran's Q statistic was introduced in 1937 to test for equality of means under heteroscedasticity. Today, the use of Q is widespread in tests for homogeneity of effects in meta-analysis, but often these effects (such as risk differences and odds ratios) are not normally distributed. It is common to assume that Q follows a chi-square distribution, but it has long been known that this asymptotic distribution for Q is not accurate for moderate sample sizes. In this paper, the effect and weight for an individual study may depend on two parameters: the effect and a nuisance parameter. We present expansions for the first two moments of Q without any normality assumptions. Our expansions w…
Identification of a novel compound heterozygote SCO2 mutation in cytochrome c oxidase deficient fatal infantile cardioencephalomyopathy
2006
UNLABELLED Fatal infantile cardioencephalomyopathy (OMIM No. 604377) is a disorder of the mitochondrial respiratory chain and is characterised by neonatal progressive muscular hypotonia and cardiomyopathy because of severe Cytochrome c oxidase deficiency. Here we report a novel mutation in the Cytochrome c oxidase assembly gene SCO2 in an infant with fatal infantile cardioencephalomyopathy despite normal initial metabolic screening. CONCLUSION In newborns with unexplained muscular hypotonia and cardiomyopathy genetic testing of mitochondrial respiratory chain disorders might be helpful to establish a final diagnosis and guide treatment decisions.
Peroxisomal changes during hiberation of jerboa (Jaculus orientalis)
1998
As a member of the order of Rodentia, jerboa (Jaculus orientalis) is a natural deep hibernator and lives in subdesert highland in many parts of the world, including Morocco. Its small size (adult body weight ∼100 g), availability in the wild, tolerance to laboratory conditions, and some unique peroxisomal properties make it a suitable research subject for exploring peroxisome biogenesis under prehibernating and hibernating states. During 3 w, animals referred to as the prehibernator group were exposed to cold temperature (5 to 7°C) with food ad libitum. Part of the prehibernator group entered deep hibernation 24 to 48 h after starvation. Animals were sacrificed 4 and 6 d after starting hibe…
Peroxisome proliferator-activated receptors as regulators of lipid metabolism; tissue differential expression in adipose tissues during cold acclimat…
2004
Brown (BAT) and white (WAT) adipose tissues play a key role in the body energy balance orchestrated by the central nervous system. Hibernators have developed a seasonal obesity to respond to inhospitable environment. Jerboa is one of the deep hibernator originated from sub-desert highlands. Thus, this animal represents an excellent model to study cold adaptation mechanism. We report that the adipogenic factor PPARgamma exhibits a differential expression between BAT and WAT at mRNA level. A specific induction was only seen in WAT of pre-hibernating jerboa. Interestingly, PPAR beta/delta is specifically induced in BAT and brain of pre-hibernating jerboa, highlighting for the first time the po…
Positive affectivity and health
2011
RESUMEN Clásicamente se ha relacionado la afectividad positiva con la salud, y se intuye que hay una conexión directa entre ambas. De hecho, se cree que el desarrollo de sentimientos y emociones positivas ejerce un papel preventivo respecto a la enfermedad; o lo que es lo mismo, actúa como factor protector de la salud. En este texto se pretende explorar la relación entre ambos conceptos a través de diversos postulados teóricos de la Psicología de las emociones. Como resultados principales destaca la confirmación de la hipótesis que apunta a una íntima relación entre estos dos aspectos. Muchos autores consideran que en la actitud o forma de reaccionar ante los estímulos que nos rodean, está …
Krūts audzēju infiltrējošo B šūnu producēto antivielu profilēšana
2015
Pētījumi liecina, ka B šūnas var gan veicināt, gan kavēt vēža veidošanos. Audzējā infiltrēto B šūnu (TIB) daudzums korelē ar slimības gaitu un prognozi, bet mehānismi, kā TIB ietekmē pret-vēža imūno atbildi, joprojām ir neskaidri. Šī darba mērķis ir noskaidrot kādas IgG un IgA klases antivielas B šūnas producē vēža mikrovidē, un vai visas šīs antivielas ir sastopamas arī pacientu plazmā. Ar rekombinanto antigēnu mikročipu palīdzību tika analizēts antivielu repertuārs no krūts vēža un audzējam blakus esošiem krūts audiem iegūto B šūnu kultūru supernatantos un plazmā. Tika atrasti 34 un 31 antigēns pret kuriem veidojas IgG un IgA klases antivielas vēža pacientēm; antigēnu repertuārs bija līdz…
Autophagy, cathepsin L transport, and acidification in cultured rat fibroblasts.
1992
The mechanisms of enzyme delivery to and acidification of early autophagic vacuoles in cultured fibroblasts were elucidated by cryoimmunoelectron microscopic methods. The cation-independent mannose-6-phosphate receptor (MPR) was used as a marker of the pre-lysosomal compartment, and cathepsin L and an acidotropic amine (3-(2,4-dinitroanilino)-3'-amino-N-methyl-dipropylamine (DAMP), a cytochemical probe for low-pH organelles) as markers of both pre-lysosomal and lysosomal compartments. In addition, cationized ferritin was used as an endocytic marker. In ultrastructural double labeling experiments, the bulk of all the antigens was found in vesicles containing tightly packed membrane material…
Uptake of endocytic markers by rice cells: variations related to the growth phase.
2001
Endocytosis is now considered a basic cellular process common to plant cells. Although both non-specific and receptor-mediated endocytosis appear to take place in plant cells, the physiological role of the latter remains unclear. We have investigated the endocytic process in rice cell suspensions using two biotinylated proteins, peroxidase and bovine serum albumin (bHRP and bBSA), as markers. First, we show that markers are internalized by rice cells and appear in intracellular membranes. The uptake of the two markers is temperature dependent, saturable with time and markers dose and it is competed by free biotin. Thus, it shows the properties of a receptor-mediated process. We also show th…
Fuentes agrarias pre catastrales valencianas. Su utilidad geográfica
1998
Valencia agrarian precatastral sources. Its geographical utility. The socalled Llibres de Values de la Peyta and Cap-patrons are the oldest agrarian census in Valencia. As a geographic source, they give information about the properties, their division into plots, and about the types of lands and crops. They also make possible an approximate cartographic representation of all this.