Search results for "rites"

Metazoan Circadian Rhythm: Toward an Understanding of a Light-Based Zeitgeber in Sponges

2013

In all eukaryotes, the 24-h periodicity in the environment contributed to the evolution of the molecular circadian clock. We studied some elements of a postulated circadian clock circuit in the lowest metazoans, the siliceous sponges. First, we identified in the demosponge Suberites domuncula the enzyme luciferase that generates photons. Then (most likely), the photons generated by luciferase are transmitted via the biosilica glass skeleton of the sponges and are finally harvested by cryptochrome in the same individual; hence, cryptochrome is acting as a photosensor. This information-transduction system, generation of light (luciferase), photon transmission (through the siliceous spicules),…

The role of the effect of manufacturing tolerances on a tubular linear ferrite motor

2015

Electric machines are often designed without considering workmanship and materials tolerances. Their manufacturing process involves a series of steps, starting with raw materials and ending with the machine assembly. In each of these steps occur deviations due, for instance, to mistakes in positioning tools or to the tolerances in the electrical and magnetic characteristics of the materials. These deviations may cause unwanted parasitic effects such as torque ripple, losses or acoustic noise. Such effects have to be considered especially in machines used in industrial drives for high performance applications. Moreover the tolerances in the magnetic materials have a considerable effect on th…

Ethylene modulates gene expression in cells of the marine sponge Suberites domuncula and reduces the degree of apoptosis.

1999

Sponges (phylum Porifera) live in an aqueous milieu that contains dissolved organic carbon. This is degraded photochemically by ultraviolet radiation to alkenes, particularly to ethylene. This study demonstrates that sponge cells (here the demosponge Suberites domuncula has been used), which have assembled to primmorphs, react to 5 microM ethylene with a significant up-regulation of intracellular Ca(2+) concentration and with a reduction of starvation-induced apoptosis. In primmorphs from S. domuncula the expression of two genes is up-regulated after exposure to ethylene. The cDNA of the first gene (SDERR) isolated from S. domuncula encodes a potential ethylene-responsive protein, termed ER…

Nerve growth factor and epidermal growth factor stimulate clusterin gene expression in PC12 cells

1999

Clusterin (apolipoprotein J) is an extracellular glycoprotein that might exert functions in development, cell death and lipid transport. Clusterin gene expression is elevated at sites of tissue remodelling, such as differentiation and apoptosis; however, the signals responsible for this regulation have not been identified. We use here the clusterin gene as a model system to examine expression in PC12 cells under the control of differentiation and proliferation signals produced by nerve growth factor (NGF) and by epidermal growth factor (EGF) respectively. NGF induced clusterin mRNA, which preceded neurite outgrowth typical of neuronal differentiation. EGF also activated the clusterin mRNA, …

EVOLUTION OF THE INNATE AND ADAPTIVE IMMUNE SYSTEMS

1999

Porifera (sponge) form the lowest metazoan phylum and share a common ancestor with other metazoan phyla. In the present study, it is reported that sponges possess molecules that are similar in structure to those molecules involved in the immune system in mammals. Experiments with the marine sponges Geodia cydonium and Suberites domuncula have been performed on tissue (auto- and allografting) as well as on a cellular level. The studies revealed that sponges are provided with elements of the mammalian innate immune system, such as molecules containing scavenger receptor cysteine-rich domains. Furthermore, macrophage-derived cytokine-like molecules have been identified that are up-regulated du…

Brites, Joana Rita da Costa. O capital da arquitectura. Estado Novo. Arquitectos e Caixa Geral de Depósitos (1929-1970)

2015

THE ARCHETYPE OF PARADISE: DYING IN HOLIDAYS DOES NOT SOUND COOL

2014

Holidays play a vital role in the configuration of our life. Our most profound expectances are posed to this magic moment. However, under some contexts, what starts as a dream ends in a nightmare. It is unfortunate this is the case of victims of Villa Gesell’s tragedy, resulted when a ray impacted directly to a beach. Nobody is immune of tragedy, even at holidays. This essay review explores not only the anthropological roots of risk and paradise, but also the journalist discourse to cover the event. Far from the general opinion, disasters affect tourism, we strongly believe it strengths its attractiveness.

Eiropas Savienības izvirzīto ilgtspējas mērķu sasniegšana Latvijas kontekstā.

2020

Pasaulē strauji palielinās resursu patēriņš un pieprasījums pēc tiem, kā rezultātā rodas arī liels atkritumu apjoms, kas būtiski ietekmē ne tikai vidi un klimatu, bet arī iedzīvotājus. Šo iemeslu dēļ Eiropas Savienība ir izstrādājusi ilgtspējas mērķus, kas jāsasniedz līdz 2030.gadam. Bakalaura darba mērķis ir izpētīt Latvijas virzību šo mērķu sasniegšanā. Lai izpētītu šo virzību, darba ietvaros tiek pētīti Latvijas iedzīvotāju sadzīves atkritumu šķirošanas paradumi un dažādi faktori, kas motivētu iedzīvotājus šķirot ikdienā vēl apzinīgāk. Pētījuma gaitā tika secināts, ka Latvijas iedzīvotāji ikdienā labprāt šķiro atkritumus, bet ne vienmēr ir pieejami nepieciešamie konteineri. Kaut arī Latv…

Industriālās simbiozes vadīšana starp mašīnbūves un metālapstrādes nozaru uzņēmumiem.

2017

Maģistra darba tēma ir “Industriālās simbiozes vadīšana starp mašīnbūves un metālapstrādes uzņēmumiem”. Darba mērķi ir iepazīties ar aprites ekonomikas jēdzienu, pasaules praksi industriālās simbiozes parku izveidē, darbībā un vadībā, izstrādāt teorētiskus industriālās simbiozes parka darbības un vadības modeļus uz metālapstrādes un mašīnbūves nozaru uzņēmumu bāzes, kas sekmētu efektīvāku industriālo atkritumu apsaimniekošanu, ražošanas izejvielu iegādi, attīstītu tīklveida sadarbību starp uzņēmumiem un spētu radīt papildus konkurētspējas priekšrocības.

Dalīšanās ekonomika Latvijā.

2018

Mūsdienu sabiedrības neatņemamu sastāvdaļa ir jaunākas tehnoloģijas, bez kurām ikdienu ir grūti iztēloties. Tā pat tiek runāts par piesārņojuma samazināšanas nepieciešamību. Šīm minētājām problēmām ir viens kopsaucējs- aprites ekonomika. Arvien vairāk cilvēku vēlas paši būt sava laika noteicēji, šādu risinājumu sniedz pašnodarbinātība, ko piedāvā dalīšanās ekonomika. Šī pētījuma mērķis ir noskaidrot Latvijas iedzīvotājiem pieejamās informācijas apjomu un kvalitāti, kā arī apkopot Latvijas iedzīvotājiem pieejamos dalīšanās ekonomikas uzņēmumus. Pētījuma rezultātā, darba autore secina, ka aptuveni 63% Latvijas iedzīvotāju vismaz daļēji zina, kas ir dalīšanās ekonomika, no kuriem vairāk kā 90%…