Clave para la determinación de exuvias pupales de los quironómidos (Diptera: Chironomidae) de ríos altoandinos tropicales

The Chironomidae is a cosmopolitan family of Nematoceran flies with more than 20 000 species described. However the diversity of genera and species of the family in the Andean region beyond the 2 000m.a.s.l are scarcely known. We conducted faunal surveys and biomonitoring research in different streams of Colombia, Ecuador and Peru from May 2005 to October 2011. Based on specimens collections, and a taxonomic key was developed to identify pupae and pupal exuviae of 46 genera of midges (Diptera, Chironomidae) collected from streams at high altitude areas on the Andean tropical mountains. We included illustrations and brief taxonomic descriptions for all genera, of which several ones have not yet been formally described; in this latter case we used the nomenclature of Roback & Coffman (1983). For two genera, Cricotopus and Genus 1, keys to the most common morphospecies were provided. Results showed that in this area the chironomid assemblages are dominated by the members of the subfamily Orthocladiinae (22 genera) followed by the Chironominae (13). Six genera of Tanypodinae were identified, while only three and two genera were present from subfamilies Podonominae and Diamesinae. This key may be very useful for both studies about drift in streams, and for biomonitoring purposes.

La biota de los ríos : los microorganismos autótrofos

Capítol 12 del llibre 'Conceptos y técnicas en ecología fluvial' que es refereix als microorganismes autòtrofes dels sistemes fluvials

Uso de ríos artificiales en ecología fluvial

Capítol 21 del llibre 'Conceptos y técnicas en ecología fluvial' que es refereix a la utilització dels rius artificials en ecologia fluvial

Presentación: importancia de los ríos

Capítol 1 del llibre 'Conceptos y técnicas en ecología fluvial' que es refereix a la importància dels rius per ser els que connecten les conques terrestres amb l'atmosfera i amb el mar; els que transporten a més a més d'aigua, sals, sediments i organismes i on es produeixen complexes reaccions químiques i biològiques, que són en part responsables, de les característiques químiques de l'aigua que es troba als llacs i als oceans

La biota de los ríos: los microorganismos heterotróficos

Capítol 11 del llibre 'Conceptos y técnicas en ecología fluvial' que es refereix als microorganismes heterotròfics dels sistemes fluvials

Gammal julpsalm från 15de århundradet: Det är en ros utsprungen

Soitinnus: lauluääni, piano.

Automatització d'un procés de fabricació de peces plàstiques

RESUM L'automatització s'utilitza des de fa molts anys, tot i que va començar a agafar la definició que coneixem actualment al voltant dels anys seixanta i setanta, moment en què es comencen a comercialitzar els primers PLC. A partir d'aquí, el seu creixement ha estat exponencial. En aquest sentit, la tecnologia ha anat avançant i ha augmentat els components que la forma, per això a hores d'ara encara no sabem fins on podrà arribar i què aconseguirà. Per a la indústria tot això ha significat l'automatització de processos que fins ara utilitzaven molt mà d'obra, reduint-la dràsticament. Una de les indústries que més s'ha beneficiat de tots aquests avenços ha estat la de l'automoció, concretament les seves grans línies de producció, automatitzades a uns nivells que fins fa poc temps eren impensables. Aquest projecte forma part d'aquesta indústria, no directament per a la construcció de l'automòbil, sinó indirectament, ja que l'empresa per a la qual s'ha fet l'automatització fabrica peces plàstiques per a automòbils. Concretament, unes peces amb uns injerts metàl•lics conductors que es munten a tots els vehicles i s'utilitzen per accionar els neteja vidres dels cotxes. Aquest fet implica que la fabricació i el disseny de la peça sigui curosament vigilat i controlat per al client final, amb uns controls de qualitat extremadament exigents. El funcionament del procés de fabricació es fa a partir d'unes peces de plàstic produïdes per una injectora que es fan passar per unes estacions automatitzades, cada una de les quals fa una acció concreta per aconseguir el muntatge final.

En ros mer skön

Soitinnus: sekakuoro.

Do blood components affect the production of reactive oxygen species (ROS) by equine synovial cells in vitro?

Blood-derived products are commonly administered to horses and humans to treat many musculoskeletal diseases, due to their potential antioxidant and anti-inflammatory effects. Nevertheless, antioxidant effects have never been shown upon horse synovial fluid cells in vitro. If proved, this could give a new perspective to justify the clinical application of blood-derived products. The aim of the present study was to investigate the antioxidant effects of two blood-derived products - plasma (unconditioned blood product - UBP) and a commercial blood preparation (conditioned blood product - CBP)¹ - upon stimulated equine synovial fluid cells. Healthy tarsocrural joints (60) were tapped to obtain synovial fluid cells; these cells were pooled, processed, stimulated with lipopolysaccharide (LPS) or phorbol 12-myristate 13-acetate (PMA), and evaluated by flow cytometry for the production of reactive oxygen species (ROS). Upon addition of any blood-derived product here used - UBP and CBP - there was a significant decrease in the oxidative burst of synovial fluid cells (P<0.05). There was no difference between UBP and CBP effects. In conclusion, treatment of stimulated equine synovial cells with either UBP or CBP efficiently restored their redox equilibrium.

Modulation of ROS production in human leukocytes by ganglioside micelles

Recent studies have reported that exogenous gangliosides, the sialic acid-containing glycosphingolipids, are able to modulate many cellular functions. We examined the effect of micelles of mono- and trisialoganglioside GM1 and GT1b on the production of reactive oxygen species by stimulated human polymorphonuclear neutrophils using different spectroscopic methods. The results indicated that exogenous gangliosides did not influence extracellular superoxide anion (O2.-) generation by polymorphonuclear neutrophils activated by receptor-dependent formyl-methionyl-leucyl-phenylalanine. However, when neutrophils were stimulated by receptor-bypassing phorbol 12-myristate 13-acetate (PMA), gangliosides above their critical micellar concentrations prolonged the lag time preceding the production in a concentration-dependent way, without affecting total extracellular O2.- generation detected by superoxide dismutase-inhibitable cytochrome c reduction. The effect of ganglioside GT1b (100 µM) on the increase in lag time was shown to be significant by means of both superoxide dismutase-inhibitable cytochrome c reduction assay and electron paramagnetic resonance spectroscopy (P < 0.0001 and P < 0.005, respectively). The observed phenomena can be attributed to the ability of ganglioside micelles attached to the cell surface to slow down PMA uptake, thus increasing the diffusion barrier and consequently delaying membrane events responsible for PMA-stimulated O2.- production.

Berberine induces apoptosis via ROS generation in PANC-1 and MIA-PaCa2 pancreatic cell lines

Pancreatic cancer is the fourth leading cause of cancer death. Gemcitabine is widely used as a chemotherapeutic agent for the treatment of pancreatic cancer, but the prognosis is still poor. Berberine, an isoquinoline alkaloid extracted from a variety of natural herbs, possesses a variety of pharmacological properties including anticancer effects. In this study, we investigated the anticancer effects of berberine and compared its use with that of gemcitabine in the pancreatic cancer cell lines PANC-1 and MIA-PaCa2. Berberine inhibited cell growth in a dose-dependent manner by inducing cell cycle arrest and apoptosis. After berberine treatment, the G1 phase of PANC-1 cells increased by 10% compared to control cells, and the G1 phase of MIA-PaCa2 cells was increased by 2%. Whereas gemcitabine exerts antiproliferation effects through S-phase arrest, our results showed that berberine inhibited proliferation by inducing G1-phase arrest. Berberine-induced apoptosis of PANC-1 and MIA-PaCa2 cells increased by 7 and 2% compared to control cells, respectively. Notably, berberine had a greater apoptotic effect in PANC-1 cells than gemcitabine. Upon treatment of PANC-1 and MIA-PaCa2 with berberine at a half-maximal inhibitory concentration (IC50), apoptosis was induced by a mechanism that involved the production of reactive oxygen species (ROS) rather than caspase 3/7 activation. Our findings showed that berberine had anti-cancer effects and may be an effective drug for pancreatic cancer chemotherapy.

Aislamiento e identificación de Ichthyophonus hoferi en peces de importancia comercial del noreste de México

Tesis (Maestría en Ciencias con Especialidad en Parasitología) UANL

Análisis y modelación de un sistema de espera José Guadalupe Ríos Alejandro

Tesis (Maestría en Ciencias de la Administración, con especialidad en Investigación de Operaciones) U.A.N.L.

Análisis taxonómico y zoogeográfico de los peces de la zona norte y centro del estado de Veracruz, México [por] Hortencia Obregón Barboza

Tesis (Maestría en Ciencias con Especialidad en Ecología Acuática y Pesca) U.A.N.L.