Search results for "laboratori"
showing 10 items of 390 documents
ÁCIDOS Y BASES
1994
Audiovisual didáctico que pretende subsanar la falta de práctica de los alumnos de Bachiller en nomenclatura y formulación.
Rīgas Tehniskās koledžas laboratoriju darba drošības pasākumu pilnveide
2022
Rīgas Tehniskās koledžas laboratoriju darba drošības pasākumu pilnveide. Darba autore: Zanda Beķe. Darba zinātniskais vadītājs: Dr.ķīm., docents Ingars Reinholds. Darbs izklāstīts uz 44 lpp, ietver 18 attēlus, 1 tabulu, 1 pielikumu, 23 informatīvos avotus. Pētījums sastāv no 3 daļām. Pirmajā daļā ir apkopota un analizēta literatūra par darba aizsardzības sistēmu Latvjā, darba vides iekšējo uzraudzību, kā arī par mācību laboratorijām Latvijā un pasaulē un metodēm darba vides uzlabošanai laboratorijās. Otrajā daļā ir aprakstītas pētījumā pielietotās metodes, bet trešajā daļā ir apkopotas laboratorijas darbinieku atbildes par darba vidi, individuālajiem un kolektīvajiem darba aizsardzības līdz…
Thermomineral waters of Greece: geochemical characterization
2020
Effects of the volatile organic compounds over the human pre-embryo development
2017
La contaminación ambiental produce una gran variedad de efectos negativos en la salud humana, dentro de los cuales se incluyen diferentes problemas reproductivos. En lo que respecta a la reproducción asistida existen aún muchos vacíos en cuanto a las interacciones que los compuestos puedan tener con diferentes tipos de células, gametos y embriones, los cuales son manipulados a diario través de diferentes técnicas dentro de los laboratorios de fecundación in vitro (FIV). Así mismo, la calidad del aire de estos laboratorios depende de las personas, actividades y elementos presentes dentro y fuera del laboratorio, por lo cual existe un riesgo constante de contaminación que puede ocasionar daño…
Laboratorijas trauku un iekārtu katalogi Latvijas Ķīmijas vēstures muzeja krājumā
2020
The library of the Latvian Chemistry History Museum contains catalogs of laboratory vessels and equipment from 16 different manufacturers, which were published in the period from 1900 to 1961. The article explores the manufacturers of laboratory vessels and equipment, as well as provides information on the history of product catalogs and scientific equipment catalogs.
Comparación de dos métodos de evaluación simplificada del riesgo químico por inhalación en un laboratorio universitario (COSHH Essentials y método ba…
2016
En conclusión, hemos comprobado que ambos métodos pueden ser un recurso sencillo para planificar la prevención en entornos laborales con riesgo químico. El método basado en el INRS contempla más determinantes del riesgo que el COSHH Essentials, pero las características dispares de ambos métodos deben determinar la mejor elección para cada situación; o incluso, como sugieren nuestros resultados, su utilización complementaria. Se debe añadir que, "es razonable iniciar el proceso de evaluación con un análisis cualitativo, a pesar de que, en muchas ocasiones no es posible alcanzar conclusiones sobre el riesgo y es necesario realizar una evaluación cuantitativa"; también sería recomendable, ante…
Quantification of cortical proprioceptive processing through a wireless and miniaturized EEG amplifier.
2022
Corticokinematic coherence (CKC) is computed between limb kinematics and cortical activity (e.g. MEG, EEG), and it can be used to detect, quantify and localize the cortical processing of proprioceptive afference arising from the body. EEG-based studies on CKC have been limited to lab environments due to bulky, non-portable instrumentations. We recently proposed a wireless and miniaturized EEG acquisition system aimed at enabling EEG studies outside the laboratory. The purpose of this work is to compare the EEG-based CKC values obtained with this device with a conventional wired-EEG acquisition system to validate its use in the quantification of cortical proprioceptive processing. Eleven hea…
Methodological Aspects of the Application of the Naka-Rushton Equation to Clinical Electroretinogram
1993
The nonlinear relation between stimulus intensity and response amplitude of the electroretinogram (ERG) scotopic b wave can be described by a curve based on the Naka-Rushton (NR) equation. Up to now, the NR equation has been used to assess the features of the normal and pathological ERG, but the best approach for a correct evaluation of the parameters is still debatable. The parameters are thought to be related to the different conditions of retinal activities. The method is well known in experimental laboratories but is quite unusual at the clinical level. In the present paper the derivative analysis of the NR function is proposed as an easier approach to understand the variations of the N…
Clinical Problem Solving and Using New Paths in the Laboratory: Learning from Case Studies.
2020
AbstractThree selected casuistic studies of individual patient problems from my long-standing professional experience are presented. I intend to highlight the potential contribution of case studies, including new approaches of laboratory investigation, for the advancement of pathophysiological knowledge and would encourage to “rehabilitate” the low academic profile generally attributed to “case reports.”
Data from: Parallel diversifications of Cremastosperma and Mosannona (Annonaceae), tropical rainforest trees tracking Neogene upheaval of South Ameri…
2017
Much of the immense present day biological diversity of Neotropical rainforests originated from the Miocene onwards, a period of geological and ecological upheaval in South America. We assess the impact of the Andean orogeny, drainage of lake Pebas, and closure of the Panama Isthmus on two clades of tropical trees (Cremastosperma, c. 31 spp.; and Mosannona, c. 14 spp.; both Annonaceae). Phylogenetic inference revealed similar patterns of geographically restricted clades and molecular dating showed diversifications in the different areas occurred in parallel, with timing consistent with Andean vicariance and Central American geodispersal. Ecological niche modelling approaches show phylogenet…