Search results for "Laboratory"
showing 10 items of 923 documents
Der Fr�hnachweis des Herzinfarktes durch Bestimmung der Wasserstoffionenkonzentration im Herzmuskel mit Indicatorpapier
1965
Es wird eine einfache Methode zum Fruhnachweis des Herzinfarktes beschrieben. Durch Messung der Wasserstoffionenkonzentration an Kryostatschnitten vom Herzen mit pH-Indicatorpapier wird ein bei Ratten und Katzen erzeugter Ischamiebezirk bereits 5 min nach Unterbindung einer Coronararterie im Herzmuskel nachweisbar. Die in der Literatur beschriebene Anderung der Wasserstoffionenkonzentration in einer Nekrose wird fur den Herzinfarkt bestatigt und dient zu seinem Nachweis bis zum Auftreten von lichtmikroskopisch erkennbaren Nekrosezeichen.
Reduction of scouring downstream of a rigid bed by means of a vegetated carpet: experimental investigation in a laboratory flume
2016
Vegetation is a critical component of aquatic ecosystems and exerts an important role in river morphodynamics. This paper describes the results of laboratory study carried out to investigate the role of vegetation on flow field and erosion process developing in non-equilibrium situations. Particular attention is paid to scour evolving downstream of a rigid bed and to the effect of a vegetated carpet used as a protective measure against scouring. The reported experimental study shows that the introduction of the vegetated carpet results in a more favourable configuration than in its absence determining reduced values of flow velocity, turbulence intensity and bed shear stress, and modifying …
Microhabitat selection and audible sexual signalling in the wolf spider Hygrolycosa rubrofasciata (Araneae, Lycosidae)
2000
We studied the microhabitat selection and male sexual signalling behaviour in the wolf spider Hygrolycosa rubrofasciata (Ohlert). Males strike dry leaves with their abdomen, producing an audible sexual drumming signal, and females use this signal to choose mating partners. In the field we followed male drum- ming rate and microhabitat selection using both the mark-recapture method and direct observations. In the laboratory we conducted an experiment on male micro- habitat and drumming substrate selection. We found that in the field males were not distributed randomly among the habitat; fewer males were found in areas that had high sedge cover, low elevation, and low dry leaf cover. In the l…
Plasma Insulin Levels and Hypoglycemia Affect Subcutaneous Interstitial Glucose Concentration
2018
[EN] Background: Continuous glucose monitoring (CGM) accuracy during hypoglycemia is suboptimal. This might be partly explained by insulin or hypoglycemia-induced changes in the plasma interstitial subcutaneous (SC) fluid glucose gradient. The aim of the present study was to assess the role of plasma insulin (PI) and hypoglycemia itself in the plasma and interstitial SC fluid glucose concentration in patients with type 1 diabetes mellitus. Methods: Eleven subjects with type 1 diabetes (age 36.59.1 years, HbA(1c) 7.90.4% [62.8 +/- 2.02mmol/mol]; mean +/- standard deviation) were evaluated under hyperinsulinemic euglycemia and hypoglycemia. Each subject underwent two randomized crossover clam…
Costruzione e validazione del questionario DIDLab “La didattica Laboratoriale: apprendimenti e stili di conduzione con l’approccio IBSE”
2021
Il presente lavoro espone gli esiti della costruzione e validazione del questiona-rio “La didattica Laboratoriale: apprendimenti e stili di conduzione con l’ap-proccio IBSE” finalizzato a misurare il grado di conoscenza dell’approccio In-quiry-Based Science Education e lo stile di conduzione nella didattica labora-toriale, che ha visto coinvolti 523 corsisti del corso di specializzazione per le attività di sostegno didattico dell’Università degli Studi di Palermo; il test di misurazione costruito è composto da 42 item suddiviso in cinque macro-aree su scala Likert a 5 punti. Dall’analisi quantitativa condotta è emerso che il questionario ha buona con-cordanza, pensato per indagare sulle con…
Inquiry based Laboratory. Una ricerca con i futuri docenti di sostegno.
2021
La formazione degli insegnanti in laboratorio è particolarmente rilevante perché consente di a t t i v a r e p r o c e s s i d i i n s e g n a m e n t o / apprendimento in cui gli alunni diventano protagonisti dei propri percorsi. Il laboratorio rappresenta la modalità trasversale che caratterizza la didattica e la formazione dei futuri docenti. Attraverso la didattica laboratoriale gli studenti hanno la possibilità di confrontarsi, di mettere in atto le abilità critiche, logiche e creative per esplorare la realtà circostante. Ciò si coniuga perfettamente con le possibilità che garantisce un laboratorio scientifico Inquiry-Based Learning centrato sul processo di investigazione. Nel presente…
Monitoring pH and ORP in a SHARON reactor
2011
This paper analyses the valuable information provided by the on-line measurements of pH and oxidation reduction potential (ORP) in a continuous single high ammonia removal over nitrite (SHARON) reactor. A laboratory-scale SHARON reactor equipped with pH, ORP, electric conductivity and dissolved oxygen (DO) probes has been operated for more than one year. Nitrogen removal over nitrite has been achieved by adding methanol at the beginning of anoxic stages. Time evolution of pH and ORP along each cycle allows identifying the decrease in nitritation rate when ammonia is consumed during the aerobic phase and the end of the denitrification process during the anoxic phase. Therefore, monitoring pH…
Technical and health governance aspects of the External Quality Assessment Scheme for the SARS-CoV-2 molecular tests: institutional experience perfor…
2022
Abstract Objectives Since December 2019, the worldwide public health has been threatened by a severe acute respiratory syndrome caused by Coronavirus-2. From the beginning, a turning point has been the identification of new cases of infection, in order to minimize the virus spreading among the population. For this reason, it was necessary introducing a panel of tests able to identify positive cases, which became crucial for all countries. Methods As a Regional Reference Centre, the CRQ Laboratory (Regional Laboratory for the Quality Control) developed and conducted an External Quality Assessment (EQA) panel of assay, so as to evaluate the quality of real-time reverse transcription polymeras…
Oxygen consumption of F0 and F1 larval and juvenile European seabass Dicentrarchus labrax in resonse to ocean acidification and warming
2022
Ongoing climate change is leading to warmer and more acidic oceans. The future distribution of fish within the oceans depends on their capacity to adapt to these new environments. Only few studies have examined the effects of ocean acidification (OA) and warming (OW) on the metabolism of long-lived fish over successive generations. We therefore aimed to investigate the effect of OA on larval and juvenile growth and metabolism on two successive generations of European sea bass (Dicentrarchus labrax L.) as well as the effect of OAW on larval and juvenile growth and metabolism of the second generation. European sea bass is a large economically important fish species with a long generation time…
ESBL-producing Klebsiella pneumoniae in a University hospital: Molecular features, diffusion of epidemic clones and evaluation of cross-transmission.
2021
The worldwide spread of Klebsiella pneumoniae producing extended-spectrum β-lactamase (ESBL-Kp) is a significant threat. Specifically, various pandemic clones of ESBL-Kp are involved in hospital outbreaks and caused serious infections. In that context, we assessed the phenotypic and molecular features of a collection of ESBL-Kp isolates in a French university hospital and evaluated the occurrence of potential cross-transmissions. Over a 2-year period (2017–2018), 204 non-duplicate isolates of ESBL-Kp were isolated from clinical (n = 118, 57.8%) or screening (n = 86, 42.2%) sample cultures. These isolates were predominantly resistant to cotrimoxazole (88.8%) and ofloxacin (82.8%) but remaine…