INTRODUCCION HIDRAULICA FLUVIAL ARTURO ROCHA PDF

arturo rocha pdf. Quote. Postby Just» Tue Aug 28, am. Looking for introduccion hidraulica fluvial arturo rocha pdf. Will be grateful for any help! Top. [3] Arturo Rocha Felices, 1ra. Edición, Noviembre “Introducción a la Hidráulica Fluvial”. [4] Arturo Rocha Felices, (). “Hidráulica de Tuberías y. Departamento Académico de Hidráulica · Universidad Nacional Arturo Rocha – Felices · Universidad Nacional Introducción a la Hidráulica Fluvial. Edited by.

Author: Gardarg Zurg
Country: Sweden
Language: English (Spanish)
Genre: History
Published (Last): 26 June 2007
Pages: 206
PDF File Size: 19.73 Mb
ePub File Size: 7.3 Mb
ISBN: 878-5-27996-730-9
Downloads: 59049
Price: Free* [*Free Regsitration Required]
Uploader: Ner

Hindbrain GLP-1 receptor mediation of cisplatin-induced anorexia and nausea. As the hindbrain glucagon-like peptide-1 GLP-1 system contributes to energy balance and mediates aversive and stressful stimuli, here we examine the hypothesis that hindbrain GLP-1 signaling mediates aspects of chemotherapy-induced nausea and reductions in feeding behavior in rats. Specificallyhindbrain GLP-1 receptor GLP-1R blockade, via 4th intracerebroventricular ICV exendin- injections, attenuates the anorexia, body weight reduction, and pica nausea-induced ingestion of kaolin clay elicited by cisplatin chemotherapy during the delayed phase 48 h of chemotherapy-induced nausea.

Additionally, the present data provide evidence that the central GLPproducing preproglucagon neurons in the nucleus tractus solitarius NTS of the caudal brainstem are activated by cisplatin during the delayed phase of chemotherapy-induced nausea, as cisplatin led to a significant increase in c-Fos immunoreactivity in NTS GLPimmunoreactive neurons.

These data support a growing body of literature suggesting that the central GLP-1 system may be a potential pharmaceutical target for adjunct anti-emetics used to treat the delayed-phase of nausea and emesis, anorexia, fluval body weight loss that accompany chemotherapy treatments.

Introduvcion abnormalities of mid and hindbrain: A study of With the advent of neuroimaging modalities specificallymagnetic resonance imaging MRIrecognition of developmental defects of posterior fossa has greatly improved. Is to delineate the clinical, cytogenetics and radiological features of patients with mid- hindbrain anomalies.

introduccion hidraulica fluvial arturo rocha pdf

Directory of Open Access Journals Sweden. Full Text Available Determining the function of regulatory elements is fundamental for our understanding of development, disease and evolution.

However, the sequence features that mediate these functions are often unclear and the prediction of tissue- specific expression patterns from sequence alone is non-trivial. Furthermore, mutagenesis of the sites abolishes activity or generates ectopic expression, demonstrating their requirement for segmentally restricted enhancer activity in the hindbrain. We hidraklica and use our syntax to predict over 3, hindbrain enhancers across the human genome.

Introducción a la Hidráulica Fluvial – ARTURO ROCHA FELICES

These sequences tend to be located near developmental transcription factors and are enriched in known hindbrain activating elements, demonstrating the predictive power of this simple model. Our findings support the theory that hundreds of CNEs, and perhaps thousands of regions across the human genome, function to coordinate gene expression in the developing hindbrain. We speculate that deeply conserved sequences of this kind contributed to the co-option of new genes into the hindbrain gene regulatory network during early vertebrate evolution by linking patterns of hox expression to downstream genes involved in segmentation and patterning, and evolutionarily newer instances may have continued to eocha to lineage- specific elaboration of the hindbrain.

The vertebrate Hox gene regulatory network for hindbrain segmentation: Coupling of a Hox gene regulatory network to hindbrain segmentation is an ancient introduccino originating at the base of fulvial. Hindbrain development is orchestrated by a vertebrate gene regulatory network that generates segmental patterning along the anterior-posterior axis via Hox genes.

Here, we review analyses of vertebrate and invertebrate chordate models that inform upon the evolutionary origin and diversification of this network. Evidence from the sea lamprey reveals that the hindbrain regulatory network generates rhombomeric compartments with segmental Hox fluvil and an underlying Hox code.

We infer that this basal feature was present in ancestral vertebrates and, as an evolutionarily constrained developmental state, introducicon fundamentally important for patterning of the vertebrate hindbrain across diverse lineages.

Despite the common ground plan, vertebrates exhibit neuroanatomical diversity in lineage- specific patterns, with different vertebrates revealing variations of Hox expression in the hindbrain that could underlie this diversification. Invertebrate chordates lack hindbrain segmentation but exhibit some conserved aspects of this network, intoduccion retinoic acid signaling playing a role in establishing nested domains of Hox expression.

We recently showed that the heterochronic transplantation of parvalbumin PV or somatostatin SST interneurons from the medial ganglionic eminence MGE reactivates ocular dominance plasticity ODP fluvila the postnatal mouse visual cortex. Might other types of interneurons similarly induce cortical plasticity? Here, we establish that caudal ganglionic eminence CGE-derived interneurons, when transplanted into the visual cortex of artiro mice, migrate extensively in the host brain and acquire laminar distribution, marker expression, electrophysiological properties, and visual response properties like those of host CGE interneurons.

Although transplants from the anatomical CGE do induce ODP, we found that this plasticity reactivation is mediated by a small fraction of MGE-derived cells contained in the transplant.

  EL CONFORMISTA - ALBERTO MORAVIA PDF

These findings demonstrate that transplanted CGE cells can successfully engraft into the postnatal flkvial brain and confirm the unique role of MGE lineage neurons in the induction of ODP.

Caudal fourth ventricular administration of the AMPK activator 5-aminoimidazolecarboxamide-riboside regulates glucose and counterregulatory arthro profiles, dorsal vagal complex metabolosensory neuron function, and hypothalamic Fos expression.

This study investigated the hypothesis that estrogen controls hindbrain AMP-activated protein kinase AMPK activity and regulation of blood glucose, counterregulatory hormone secretion, and hypothalamic nerve cell transcriptional status.

Dorsal vagal complex A2 noradrenergic neurons were laser microdissected from estradiol benzoate E – or oil O -implanted ovariectomized female rats after caudal fourth ventricular CV4 delivery of the AMPK activator 5-aminoimidazolecarboxamide-riboside AICARfor Western blot analysis. CV4 AICAR also resulted in site- specific modifications in Fos immunolabeling of hypothalamic metabolic structures, including the paraventricular, ventromedial, and arcuate nuclei.

The current studies demonstrate that estrogen regulates AMPK activation in caudal hindbrain A2 noradrenergic neurons during pharmacological replication of energy shortage in this area of the brain, and that this sensor is involved in neural regulation of glucostasis, in part, through control of corticosterone secretion.

The results also imply that estrogen promotes glucose and lactate uptake by these cells under those conditions. Evidence for correlation between hindbrain AMPK and hypothalamic nerve cell genomic activation provides novel proof for functional connectivity between this hindbrain sensor and higher order metabolic brain loci while demonstrating a modulatory role for estrogen in this interaction.

Hindbrain medulla catecholamine cell group involvement in lactate-sensitive hypoglycemia-associated patterns of hypothalamic norepinephrine and epinephrine activity.

Cell-type compartmentation of glucose metabolism in the brain involves trafficking of the oxidizable glycolytic end product, l-lactate, by astrocytes to fuel neuronal mitochondrial aerobic respiration. Lactate availability within the hindbrain medulla is a monitored function that regulates systemic glucostasis as insulin-induced hypoglycemia IIH is exacerbated by lactate repletion of that brain region.

A2 noradrenergic neurons are a plausible source of lactoprivic input to the neural gluco-regulatory circuit as caudal fourth ventricular CV4 lactate infusion normalizes IIH-associated activation, e. Here, we investigated the hypothesis that A2 neurons are unique among medullary catecholamine cells in directly screening lactate-derived energy.

Adult male rats were injected with insulin or vehicle following fluviql of continuous l-lactate infusion into the CV4. Results show that AMPK is expressed in each cell group, but only a subset, e. The present evidence for discriminative reactivity of AMPK-expressing medullary catecholamine neurons to the screened energy substrate lactate implies that that lactoprivation is selectively signaled to the hypothalamus by A2 noradrenergic and C1 adrenergic cells.

Published by Elsevier Ltd. Caudal ropivacaine in infants. Ropivacaine is a new long-acting amino-amide local anesthetic. However, there are no data on its use in infants.

In the current study, the authors investigated the pharmacokinetics of caudal ropivacaine in 30 infants younger than 12 months Neurogenin3 restricts serotonergic neuron differentiation to the hindbrain.

caudal hindbrain specification: Topics by

The development of the nervous system is critically dependent on the production of functionally diverse neuronal cell types at their correct locations.

In the embryonic neural tube, dorsoventral signaling has emerged as a fundamental mechanism for generating neuronal diversity. In contrast, far less is known about how different neuronal cell types are organized along the rostrocaudal axis. In the developing mouse and chick neural tube, hindbrain serotonergic neurons and spinal glutamatergic V3 interneurons are produced from ventral p3 progenitors, which possess a common transcriptional identity but are confined to distinct anterior-posterior territories.

In this study, we show that the expression of the transcription factor Neurogenin3 Neurog3 in the spinal cord fluvil the correct specification of p3-derived neurons. Gain- and loss-of-function manipulations in the chick and mouse embryo show that Neurog3 switches ventral progenitors from a serotonergic to V3 differentiation program by repressing Ascl1 in spinal p3 progenitors through a mechanism dependent artiro Hes proteins.

In this way, Neurog3 establishes the posterior boundary of the serotonergic system by actively suppressing serotonergic specification in the spinal cord. These results explain how equivalent p3 progenitors within the hindbrain and the spinal cord produce functionally distinct neuron cell types. During neurogenesis, neural patterning is a critical step during which neural progenitor cells differentiate into neurons with distinct functions.

However, the molecular determinants that regulate neural patterning remain poorly understood. Here we optimized the “dual SMAD inhibition” method to specifically promote differentiation of human pluripotent stem cells hPSCs into forebrain and hindbrain neural progenitor cells along the rostral- caudal axis.

We report that neural patterning determination occurs at the very early stage in this differentiation. Undifferentiated hPSCs expressed basal levels of the transcription factor orthodenticle homeobox 2 OTX2 that dominantly drove hidraulia into the “default” introducciion fate at the beginning of differentiation. Our findings have uncovered a mutual antagonism between NANOG and OTX2 underlying cell fate decisions during neural patterning, critical for the regulation of early neural development in humans.

Retinoic acid is a potential dorsalising signal in the late embryonic chick hindbrain. Full Text Available Abstract Background Human retinoic acid teratogenesis results in malformations of dorsally derived hindbrain structures such as the cerebellum, noradrenergic hindbrain neurons and the precerebellar system.

  CARA MEMBACA FOTO RONTGEN PDF

These structures originate from the rhombic lip and adjacent dorsal precursor pools that border the fourth ventricle roofplate. While retinoic acid synthesis is known to occur in the meninges that blanket the hindbrainthe particular sensitivity of only dorsal structures to disruptions in retinoid signalling is puzzling.

We therefore looked for evidence within the neural tube for more spatiotemporally specific signalling pathways using an in situ hybridisation screen of known retinoic acid pathway transcripts. Results We find that there are highly restricted domains of retinoic acid synthesis and breakdown within specific hindbrain nuclei as well as the ventricular layer and roofplate. Intriguingly, transcripts of cellular retinoic acid binding protein 1 are always found at the interface between dividing and post-mitotic cells.

By contrast to earlier stages of development, domains of synthesis and breakdown in post-mitotic neurons are co-localised. At the rhombic lip, expression of the fluvil for retinoic acid synthesising and catabolising eocha is spatially highly organised with respect to the Cath1-positive precursors of migratory precerebellar neurons. Conclusion The late developing hindbrain shows patterns of retinoic acid synthesis and use that are distinct from the well characterised phase of rostrocaudal patterning.

Selected post-mitotic populations, such as the locus coeruleus, appear to both make and break down retinoic acid suggesting that a requirement for an autocrine, or at least a highly localised paracrine signalling network, might explain its acute sensitivity to retinoic acid disruption.

At the rhombic lip, retinoic acid is likely to act as a dorsalising factor in parallel with other roofplate signalling pathways.

Five cases of caudal regression with rpcha aberrant abdominal umbilical artery: Further support for a caudal regression-sirenomelia spectrum. Sirenomelia and caudal regression have sparked centuries of interest and recent debate regarding their classification and pathogenetic relationship. Specific anomalies are common to both hidralica, but aside from fusion of the lower extremities, an aberrant abdominal umbilical artery “persistent vitelline artery” has been invoked as the chief anatomic finding that distinguishes sirenomelia from caudal regression.

This observation is important from a pathogenetic viewpoint, in that diversion of blood away from the caudal portion of the embryo through the abdominal umbilical artery “vascular steal” has been proposed as the primary mechanism leading to sirenomelia.

In contrast, caudal regression is hypothesized to arise from primary deficiency of caudal mesoderm. We present five cases of caudal regression that exhibit an aberrant abdominal umbilical artery similar to that typically associated with sirenomelia. Review of the literature identified four similar cases.

Collectively, the series lends support for a caudal regression-sirenomelia spectrum with a common pathogenetic basis and suggests that abnormal umbilical arterial anatomy may be the consequence, rather than the cause, of deficient caudal mesoderm. Update on neuroimaging phenotypes intrpduccion mid- hindbrain malformations.

Neuroimaging techniques including structural magnetic resonance imaging MRI and functional positron emission tomography PET are useful in categorizing various midbrain- hindbrain MHB malformations, both in allowing diagnosis and in helping to understand the developmental processes that were disturbed.

Brain imaging phenotypes of numerous malformations are characteristic features that help in guiding the genetic testing in case of direct neuroimaging-genotype correlation or, at least, to differentiate among MHB malformations entities.

The fluviall review aims to provide the reader with an update of the use of neuroimaging applications in the fine analysis of MHB malformations, using a comprehensive, recently proposed developmental and genetic classification. We have performed an extensive systematic review of the literature, from the embryology main steps of MHB development through the malformations entities, with regard to their molecular and genetic basis, conventional MRI features, and other neuroimaging characteristics.

We discuss disorders in which imaging features are distinctive and how these features reflect the structural and functional impairment of the brain. Recognition of specific MRI phenotypes, including introdduccion imaging features, is useful to recognize the MHB malformation entities, to suggest genetic investigations, and, eventually, to monitor the disease outcome after supportive therapies.

The caudal septum replacement graft. To describe a technique for reconstructing the lost tip support in cases involving caudal septal and premaxillary deficiencies. The study included patients with aesthetic and functional nasal problems resulting from the loss of caudal septal and premaxillary support. An external rhinoplasty approach was performed to reconstruct the lost support using a cartilaginous caudal septum replacement graft and premaxillary augmentation with Mersilene mesh.

A caudal septum replacement graft was combined with premaxillary augmentation in 93 patients The mean follow-up period was 3 years range, years.