Search results for "rites"

Molecular response of the sponge Suberites domuncula to bacterial infection

2001

The aim of this study was the documentation of the molecular immune response of Suberites domuncula upon bacterial infection. Additionally, the bacteria that are naturally present in the sponge after prolonged aquarium maintenance were characterized. After 6 months of maintenance of S. domuncula in seawater aquaria, only one bacterial 16S rDNA sequence could be recovered, which belongs to the genus Pseudomonas. Concomitantly, morphologically uniform bacteria were found encapsulated in bacteriocytes. These findings indicate that certain bacteria, possibly of the genus Pseudomonas, are able to persist for long periods in host bacteriocytes. Subsequent to performing a previously established in…

Debitoru parādu vadība

2015

Bakalaura darba mērķis: analīzes pamatā, noteikt debitoru parādu stāvokli, rast efektivitāi debitoru parādu vadīšanā, kas veicinātu uzņēmuma SIA „RHS” finansiālā stāvokļa uzlabošanu kopumā (uz SIA „RHS” piemērā). Pētījuma odjekts: Uzņēmums SIA „RHS”. Pētījuma priekšmets: Uzņēmuma debitoru parādi 2013. gadā, to attīstības tendences salīdzināšana ar 2012. gada rādītājiem. Bakalaura darbs sastāv no 3. nodaļām. 1. nodaļā ir izpētīta un savākta teorētiskā bāze par debitoru parādu vadību, uzskaites un novērtēšanas metodēm. 2. un 3. nodaļā ir veikts uzņēmuma debitoru parādu novērtējums. Novērtējuma veikšanai tiek izmantota uzņēmuma dokumentācija: par 2012. – 2013.gadu. Atslēgvārdi: debitoru parādi…

Apical dendritic spines and axonic terminals in the bipyramidal neurons of the dorsomedial cortex of lizards (Lacerta).

1984

Gold-toned bipyramidal neurons of the dorsomedial cortex of Lacerta have been studied using light and electron microscopy. The spines have been classified as stubby, mushroom-shaped or thin. Thin and mushroom-shaped spines are only found on proximal and intermediate dendritic segments, whereas stubby spines are found on distal dendritic segments. A Timm's method modification for electron microscopy (sulphide-osmium procedure) has been used. Timm-positive axonal endings usually synapse on thin and mushroom-shaped spines, whereas Timm-negative axonal endings usually synapse on stubby spines. Timm-positive afferents and their post-synaptic spines on bipyramidal neurons of Lacerta's dorsomedial…

Dorsal root ganglia neurite outgrowth measured as a function of changes in microelectrode array resistance

2017

Current research in prosthetic device design aims to mimic natural movements using a feedback system that connects to the patient's own nerves to control the device. The first step in using neurons to control motion is to make and maintain contact between neurons and the feedback sensors. Therefore, the goal of this project was to determine if changes in electrode resistance could be detected when a neuron extended a neurite to contact a sensor. Dorsal root ganglia (DRG) were harvested from chick embryos and cultured on a collagen-coated carbon nanotube microelectrode array for two days. The DRG were seeded along one side of the array so the processes extended across the array, contacting a…

Activation of gp 130 by IL-6/soluble IL-6 receptor induces neuronal differentiation

1998

Interleukin-6 (IL-6) on target cells binds to the specific IL-6 receptor (IL-6R) and subsequently induces homodimerization of the signal-transducing protein gp130. Cells which express gp130 but no IL-6R and which therefore do not respond to IL-6 can be stimulated by the complex of IL-6 and soluble IL-6R (slL-6R). Here we show that on rat pheochromocytoma cells (PC12), the combination of IL-6 and slL-6R but not IL-6 alone induces expression of c-fos, GAP-43 and neuron-specific enolase followed by neuron-specific differentiation and formation of a neuronal network. The differentiation was dose-and time-dependent and followed the same kinetics as nerve-growth factor (NGF)-induced differentiati…

Experimental sulphide inhibition calibration method in nitrification processes: A case-study.

2020

[EN] Sulphide is one of the inhibitors in the nitrification process in WWTP in regions with sulphate rich soils. As little information is currently available on sulphide nitrification inhibition, the aim of this study was to develop a method based on a modification of the Successive Additions Method to calibrate the effect of sulphide on the activity of ammonia-oxidising bacteria (AOB) and nitrite-oxidising bacteria (NOB). The developed method was then applied to activated sludge samples from two WWTPs with different influent sulphide concentrations. In both cases, sulphide had a greater inhibitory effect on NOB than AOB activity. The sulphide inhibition was found to be lower in the activat…

Novel mechanism for the radiation-induced bystander effect: nitric oxide and ethylene determine the response in sponge cells.

2006

Until now the bystander effect had only been described in vertebrates. In the present study the existence of this effect has been demonstrated for the phylogenetically oldest metazoan phylum, the Porifera. We used the demosponge Suberites domuncula for the experiments in the two-chamber-system. The lower dish contained irradiated "donor" cells (single cells) and the upper dish the primmorphs ("recipient" primmorphs). The "donor" cells were treated with UV-B light (40 mJ/cm2) and 100 microM hydrogen peroxide (H2O2), factors that exist also in the natural marine aquatic environment of sponges; these factors caused a high level of DNA strand breaks followed by a reduced viability of the cells.…

2001

Background Ethylene is a widely distributed alkene product which is formed enzymatically (e.g., in plants) or by photochemical reactions (e.g., in the upper oceanic layers from dissolved organic carbon). This gaseous compound was recently found to induce in cells from the marine sponge Suberites domuncula, an increase in intracellular Ca2+ level ([Ca2+]i) and an upregulation of the expression of two genes, the potential ethylene-responsive gene, SDERR, and a Ca2+/calmodulin-dependent protein kinase.

Travestirsi per Dioniso

2020

Starting from the definition of “performativity” and “gender parody” developed by Judith Butler, this paper aims to investigate the performative functions of male cross-dressing within the dynamics of social categorization in classical Athens. For this purpose I have adopted an eclectic hermeneutic toolbox, borrowing elements from Harvey Sacks’ Membership Categorization Analysis to René Girard’s scapegoat theory. Through the philological analysis of some literary representations of transvestism, such as Pentheus’ cross-dressing in Euripides’ "Bacchae", and the anthropological interpretation of the mythical-ritual complex relating to the effeminacy of Dionysus, my work focuses on the polyval…

L'armement et l'image du guerrier dans les sociétés anciennes

2011

Quatorze contributions, du néolithique ancien à la fin de l'âge du fer, évoquent les scènes de combat du Levant espagnol ou le contenu des riches tombes aristocratiques de la Tène relatifs à la guerre.