Search results for "MSE"
showing 10 items of 130 documents
Carriage of potentially fish-pathogenic bacteria in Sparus aurata cultured in Mediterranean fish farms.
2003
A bacteriological survey of gilthead sea bream Sparus aurata from different fish farms and culture systems on the Spanish Mediterranean coast was conducted. Three different studies were performed. Study A included hatchery-reared larvae; Study B, periodic examination of randomly sampled growing fish; and Study C, growing fish sampled only during mortality/morbidity events. In Studies B and C, sea cages, earth ponds and indoor tanks were surveyed, and in both cases diseased (showing clinical signs) and non-diseased fish were included. In Study A, a shift from Vibrio spp. (30 d after hatching) to oxidative species (60 d after hatching) was detected, and no mortality events were registered. Th…
Numerical Taxonomy of Vibrionaceae Isolated from Cultured Amberjack ( Seriola dumerili ) and Surrounding Water
2003
A numerical taxonomic study was performed on 148 isolates of Gram-negative, heterotrophic, facultative anaerobic bacteria isolated from amberjack (Seriola dumerili) and its surrounding culture water. The study included 30 type and reference strains belonging to genera Vibrio, Listonella, and Photobacterium. The strains were characterized by 109 morphological, biochemical, physiological, and nutritional tests. Cluster analysis of similarity matrices obtained with S(SM) and S(J) coefficients was carried out. UPGMA (unweighted pair group mathematical average) analysis defined 11 phena at S(SM) values > or = 86%. Nine phena were identified as Vibrio alginolyticus, V. fischeri, V. harveyi, V. ca…
Akumulētā oglekļa daudzums Rīgas pilsētas mežaparku augsnēs.
2015
Bakalaura darba ietvaros veiktajā pētījumā astoņos Rīgas pilsētas mežaparku (Mežaparks, Anniņmuižas mežaparks, Bolderājas mežaparks, Juglas mežaparks, Biķernieku mežaparks, Šmerļa mežaparks, Bābelītes mežaparks un Ulbrokas mežaparks) augsnēs noteikts kopējais ogleklis. Pētījumā aprēķināts kopējais akumulētais oglekļa daudzums augsnes O/A horizontā un augsnes virsējā EB horizontā. Iegūtie dati attēloti kartoshēmās. Pētījumā secināts, ka mežaparkos 1577 ha lielā platībā, augsnes nedzīvajā zemsegā, A horizontā un minerālā EB horizonta pirmajos 10 cm ir akumulēts 118,7 tūkstoši tonnu kopējā oglekļa ar vidējo kopējā oglekļa saturu 62 t C ha-1. Visvairāk kopējais ogleklis – 26,1 tūkstoši tonnu, i…
Priežu lāna zemsedzes veģetācijas uzskaites metodes analīze ilgtermiņa ekoloģisko pētījumu parauglaukumā
2020
Maģistra darba pētījumā ir apkopoti un izanalizēti dati par zemsedzes veģetācijas sugu uzskaiti vecā priežu audzē pie Mazsalacas. Uzskaiti 1994, 1996 un 2006. gadā veica Latvijas Universitātes Bioloģijas institūts. Galvenais darba mērķis ir noskaidrot, vai šāda zemsedzes veģetācijas sugu uzskaite ir izmantojama meža ekosistēmas ilgtermiņa pētījumos. Darbā izveidojot sugu sastopamības grafisko attēlojumu, kā arī sugu skaita un projektīvā seguma izmaiņu novērtējumu, var skaidri novērot visu šo parametru mainību no 1994. gada līdz 2006. gadam.
Evidence that water transmits the disease caused by the fish pathogen Photobacterium damselae subsp. damselae
2000
The transmission through water of the disease caused by the fish pathogen, Photobacterium damselae subsp. damselae, as well as the role of the skin mucus in the initial steps of the infection, have been studied. All tested strains resisted the bactericidal activity of the mucus and showed an ability to adhere to it, but only those virulent by the intraperitoneal route were infective through water. Moribund fishes showed the typical signs of the disease: haemorrhaged areas on the body surface and ulcerative lesions with mucus degradation. These results suggest that the pathogen can be transmitted to fish through water and use the skin as a portal of entry.
Crystalline wax coverage of the imaginal cuticle inCalopteryx splendens(Odonata: Calopterygidae)
2009
Abstract In this study we use high resolution SEM to describe the diversity of wax crystals and their distribution on different morphological structures in male individuals of Calopteryx splendens. The entire cuticle surface of this damselfly, with the exception of ommatidia and ocelli, is covered with crystalline wax in dimensions from submicron to micron range. It is shown that shape - rod-like, plate like, filamentous, etc. -, size, and density of crystals vary on different surfaces and in individuals of different ages. Additionally, we demonstrate different types of damage to the crystalline wax layer: scratches, compressions, wear, and contamination. The primary function of the wax cry…
Interspecific territoriality in Calopteryx damselflies: the role of secondary sexual characters
2006
Interspecific territoriality is usually interpreted to result from interspecific interference competition, although it may also originate from mistaken species recognition. In the latter case, it may be based on similarity of secondary sexual characters. In the damselfly Calopteryx splendens, males have pigmented wing spots as a sexual character, and males with the largest spots resemble males of another species, Calopteryx virgo. Probably because of this resemblance, C. virgo males are more aggressive towards large- than small-spotted C. splendens males. We examined whether wing spot size of C. splendens males affects territorial interactions between the species. In a removal experiment, t…
La cultura ci salverà? Processi di touristification a base culturale nel centro storico di Palermo
2023
Negli ultimi tre decenni la cultura ha avuto un ruolo chiave nella costruzione delle politiche urbane, divenendo uno strumento decisivo nella definizione delle strategie di sviluppo economico e nell’accesso alla competizione globale che caratterizzano l’attuale regime di neoliberismo urbano (Miles e Paddison 2005). Anche nel sud Europa la cosiddetta rigenerazione a base culturale ha rappresentato e continua ancora oggi a rappresentare una vera e propria ortodossia urbana, che trova nel turismo tanto una ragione di esistenza quanto un campo di attuazione. In particolare, negli ultimi anni i centri storici di molte città sudeuropee sono stati oggetto di trasformazioni profonde in cui pratiche…
Learning Bag of Spatio-Temporal Features for Human Interaction Recognition
2019
Bag of Visual Words Model (BoVW) has achieved impressive performance on human activity recognition. However, it is extremely difficult to capture high-level semantic meanings behind video features with this method as the spatiotemporal distribution of visual words is ignored, preventing localization of the interactions within a video. In this paper, we propose a supervised learning framework that automatically recognizes high-level human interaction based on a bag of spatiotemporal visual features. At first, a representative baseline keyframe that captures the major body parts of the interacting persons is selected and the bounding boxes containing persons are extracted to parse the poses o…
Managing biotic interactions for ecological intensification of agroecosystems.
2014
9 pages; International audience; Agriculture faces the challenge of increasing food production while simultaneously reducing the use of inputs and delivering other ecosystem services. Ecological intensification of agriculture is a paradigm shift, which has recently been proposed to meet such challenges through the manipulation of biotic interactions. While this approach opens up new possibilities, there are many constraints related to the complexity of agroecosystems that make it difficult to implement. Future advances, which are essential to guide agricultural policy, require an eco-evolutionary framework to ensure that ecological intensification is beneficial in the long term.