10 research outputs found
Cooking in chemistry: Motivation for teaching chemistry
No full textMichael Marschal, Chemie des Kochens: Motivation für den Chemieunterricht.Durch fehlenden Praxisbezug fehlt den Schülern oft jede Möglichkeit, sich mit der Naturwissenschaft Chemie identifizieren zu können. Diese Arbeit verknüpft Chemie mit einem Prozess, der für alle Menschen fast alltäglich ist, dem Kochen. Im ersten Teil beleuchtet der Autor den Begriff ?Lebensmittel? und die Zusammensetzung unserer Nahrungsmittel. Dabei wird auf alle Nährstoffe und die für den Verlauf der Arbeit wichtigsten Ergänzungsstoffe einzeln eingegangen. Der zweite Teil behandelt die chemischen Veränderungen verschiedener Nahrungsmittel bei alltäglichen Vorgängen der Lebensmittelzubereitung. Garverfahren wie das Blanchieren, Kochen, Braten und Backen werden erklärt und ihre Auswirkungen auf das Gargut analysiert. Am Ende jedes Kapitels findet man zahlreiche Schüler- und Lehrerexperimente, die schnell und einfach durchführbar sind und keine kostspieligen chemischen Apparaturen benötigen. Alle Experimente liegen protokolliert vor, inklusive Fotodokumentation und abschließender Bewertung durch den Autor. Unter dem Kapitel Mineralstoffe findet man außerdem eine Untersuchung 14 verschiedener Salzproben mittels ICP. Der letzte Teil handelt von der didaktischen Umsetzung des Themas im Chemieunterricht. Hier wird die Verbindung mit dem Lehrplan, den Basiskonzepten und den Bildungsbereichen besprochen, und es werden Anknüpfungspunkte für fächerübergreifenden Unterricht vorgeschlagen.Michael Marshal, cooking in chemistry: motivation for teaching chemistry.Due to lack of practical experience in chemistry, students often miss the chance to identify with the science chemistry. This diploma thesis illustrates the chemical processes of cooking, practiced regularly by everybody, from the scientific point of view. In the first part, the author defines the term "foodstuff" and clarifies the chemical composition of food. Hereby all nutrients and the most important supplements are discussed seperately. The second part of the thesis concentrates explicitely on the chemical reactions happening to different food during the process of cooking. Cooking methods such as blanching, boiling, frying and baking are analyzed in detail and the effects they have on the food. At the end of each chapter you can find numerous experiments for students and teachers, which are fast and simple to perform and do not require expensive chemical equipment. All of the mentioned experiments are individually protocolled, documented with photos and evaluated by the author. The chapter minerals contains in particular an in-depth study of 14 different salt samples,detected with ICP. The last part offers ideas to integrate the topic in chemistry at school. Here you can find the connection to the curriculum, to the basic concepts of education and possibilities for interdisciplinary teaching.vorgelegt von Michael MarschalAbweichender Titel laut Übersetzung der Verfasserin/des VerfassersGraz, Univ., Dipl.-Arb., 2012Zsfassung in dt. und engl. Sprach
Cooking in chemistry: Motivation for teaching chemistry
No full textMichael Marschal, Chemie des Kochens: Motivation für den Chemieunterricht.Durch fehlenden Praxisbezug fehlt den Schülern oft jede Möglichkeit, sich mit der Naturwissenschaft Chemie identifizieren zu können. Diese Arbeit verknüpft Chemie mit einem Prozess, der für alle Menschen fast alltäglich ist, dem Kochen. Im ersten Teil beleuchtet der Autor den Begriff ?Lebensmittel? und die Zusammensetzung unserer Nahrungsmittel. Dabei wird auf alle Nährstoffe und die für den Verlauf der Arbeit wichtigsten Ergänzungsstoffe einzeln eingegangen. Der zweite Teil behandelt die chemischen Veränderungen verschiedener Nahrungsmittel bei alltäglichen Vorgängen der Lebensmittelzubereitung. Garverfahren wie das Blanchieren, Kochen, Braten und Backen werden erklärt und ihre Auswirkungen auf das Gargut analysiert. Am Ende jedes Kapitels findet man zahlreiche Schüler- und Lehrerexperimente, die schnell und einfach durchführbar sind und keine kostspieligen chemischen Apparaturen benötigen. Alle Experimente liegen protokolliert vor, inklusive Fotodokumentation und abschließender Bewertung durch den Autor. Unter dem Kapitel Mineralstoffe findet man außerdem eine Untersuchung 14 verschiedener Salzproben mittels ICP. Der letzte Teil handelt von der didaktischen Umsetzung des Themas im Chemieunterricht. Hier wird die Verbindung mit dem Lehrplan, den Basiskonzepten und den Bildungsbereichen besprochen, und es werden Anknüpfungspunkte für fächerübergreifenden Unterricht vorgeschlagen.Michael Marshal, cooking in chemistry: motivation for teaching chemistry.Due to lack of practical experience in chemistry, students often miss the chance to identify with the science chemistry. This diploma thesis illustrates the chemical processes of cooking, practiced regularly by everybody, from the scientific point of view. In the first part, the author defines the term "foodstuff" and clarifies the chemical composition of food. Hereby all nutrients and the most important supplements are discussed seperately. The second part of the thesis concentrates explicitely on the chemical reactions happening to different food during the process of cooking. Cooking methods such as blanching, boiling, frying and baking are analyzed in detail and the effects they have on the food. At the end of each chapter you can find numerous experiments for students and teachers, which are fast and simple to perform and do not require expensive chemical equipment. All of the mentioned experiments are individually protocolled, documented with photos and evaluated by the author. The chapter minerals contains in particular an in-depth study of 14 different salt samples,detected with ICP. The last part offers ideas to integrate the topic in chemistry at school. Here you can find the connection to the curriculum, to the basic concepts of education and possibilities for interdisciplinary teaching.vorgelegt von Michael MarschalAbweichender Titel laut Übersetzung der Verfasserin/des VerfassersGraz, Univ., Dipl.-Arb., 2012Zsfassung in dt. und engl. Sprach
Motivation of the sales representatives of ABET Holding company
No full textkatedra: KMG; rozsah: 82This master thesis aims to find the level of satisfaction among the sales representatives of ABET Holding more precisely the sales team of Atlantis Marschal company, which is a subsidiary firm in the holding. The author made an overview of the most used and known motivation theories and described the basics of each to better understand what drives individuals. Hezberg`s theory was chosen as the one with appropriate structure. The workload of the sales representatives had to be known and described before data collection od primary data and its analysing. The motivation and hygiene factors from the Herzberg`s Dual theory structured primary data collection and further data processing. Author tried to show the weak or less strong factors in motivating the sales representatives.Tato diplomová práce je zaměřena na zjištění míry spokojenosti obchodních zástupců ABET Holding, respektive obchodního týmu společnosti Atlantis Marschal, a.s. což je dceřiná firma holdingu. Autor sestavil přehled nejpoužívanějších a nejznámějších motivačních teorií a popsal jejich podstatu. Napomáhá to lépe pochopit tomu co může motivovat jednotlivce. Hezbergova teorie byla vybrána z důvodu vhodné struktury. Bylo důležité poznat a popsat náplň práce obchodních zástupců předtím, než došlo ke sběru primárních dat a jejich analyzování. Motivační a hygienické faktory Herzbergovy Duální teorie vytvořily strukturu pro sběr primárních dat a dále pro jejich zpracování. Autor se snažil poukázat na slabiny, nebo méně silné faktory, které motivují obchodní zástupce
Spineless and overlooked: DNA metabarcoding of autonomous reef monitoring structures reveals intra‐ and interspecific genetic diversity in Mediterranean invertebrates
No full textInternational audienceThe ability to gather genetic information using DNA metabarcoding of bulk samples obtained directly from the environment is crucial to determine biodiversity baselines and understand population dynamics in the marine realm. While DNA metabarcoding is effective in evaluating biodiversity at community level, genetic patterns within species are often concealed in metabarcoding studies and overlooked for marine invertebrates. In the present study, we implement recently developed bioinformatics tools to investigate intraspecific genetic variability for invertebrate taxa in the Mediterranean Sea. Using metabarcoding samples from Autonomous Reef Monitoring Structures (ARMS) deployed in three locations, we present haplotypes and diversity estimates for 145 unique species. While overall genetic diversity was low, we identified several species with high diversity records and potential cryptic lineages. Further, we emphasize the spatial scale of genetic variability, which was observed from locations to individual sampling units (ARMS). We carried out a population genetic analysis of several important yet understudied species, which highlights the current knowledge gap concerning intraspecific genetic patterns for the target taxa in the Mediterranean basin. Our approach considerably enhances biodiversity monitoring of charismatic and understudied Mediterranean species, which can be incorporated into ARMS surveys
The buds of Oscarella lobularis (Porifera): a new convenient model for sponge cell and developmental biology
No full textAbstract The comparative study of the four non-bilaterian phyla (Cnidaria, Placozoa, Ctenophora, Porifera) should provide insights into the origin of bilaterian traits. Except for Cnidaria, present knowledge on the cell biology and development of these animals is so far limited. Non-bilaterian models are needed to get further into cell architecture and molecular mechanisms. Given the developmental, histological, ecological and genomic differences between the four sponge classes, we develop a new sponge model: the buds of the Oscarella lobularis (class Homoscleromorpha). This experimental model supplements the two other most famous sponge models Amphimedon queenslandica and Ephydatia muelleri , both belonging to the class Demospongiae. Budding is a natural and spontaneous asexual reproduction mean, but budding can be triggered in vitro ensuring availability of biological material all year long. We provide a full description of buds, from their formation to their development into juveniles. Their transparency enables fluorescent and live imaging, and their abundance allows for experimental replicates. Moreover, regeneration and cell reaggregation capabilities provide interesting experimental morphogenetic contexts. The numerous techniques now mastered on these buds make it a new suitable sponge model. Summary statement Studying sponge biology is needed to understand the evolution of metazoans. We developed a new model suitable for experimental biology that allows to study morphogenetic processes with modern tools
In Situ Hybridization Techniques in the Homoscleromorph Sponge Oscarella lobularis
No full textInternational audienc
The Buds of Oscarella lobularis (Porifera, Homoscleromorpha): A New Convenient Model for Sponge Cell and Evolutionary Developmental Biology
No full textInternational audienceThe comparative study of the four non‐bilaterian phyla (Cnidaria, Placozoa, Ctenophora, and Porifera) provides insights into the origin of bilaterian traits. To complete our knowledge of the cell biology and development of these animals, additional non‐bilaterian models are needed. Given the developmental, histological, ecological, and genomic differences between the four sponge classes (Demospongiae, Calcarea, Homoscleromorpha, and Hexactinellida), we have been developing the Oscarella lobularis (Porifera, class Homoscleromorpha) model over the past 15 years. Here, we report a new step forward by inducing, producing, and maintaining in vitro thousands of clonal buds that now make possible various downstream applications. This study provides a full description of bud morphology, physiology, cells and tissues, from their formation to their development into juveniles, using adapted cell staining protocols. In addition, we show that buds have outstanding capabilities of regeneration after being injured and of re‐epithelization after complete cell dissociation. Altogether, Oscarella buds constitute a relevant all‐in‐one sponge model to access a large set of biological processes, including somatic morphogenesis, epithelial morphogenesis, cell fate, body axes formation, nutrition, contraction, ciliary beating, and respiration
Separating faces in ARMS metabarcoding improves marine biodiversity monitoring: a comparison across protocols, experimental designs, and photographic surveys
No full textMonitoring marine biodiversity requires approaches that capture its full complexity through space and time. DNA metabarcoding coupled with Autonomous Reef Monitoring Structures (ARMS) is increasingly used for this purpose, yet most applications still pool all sessile fractions and rarely benchmark molecular ouputs against photographic observations. Here, we combined photographic analysis with cytochrome c oxidase I (COI) metabarcoding across ten north-western Mediterranean sites to test, compare, and refine ARMS-based monitoring protocols. We first optimized laboratory procedures (DNA extraction and polymerase choice) and applied the control-driven, replicate-aware VTAM pipeline to minimize false positives and ensure full traceability. We then conducted the first face-by-face comparison of α- and β-diversity between imaging and eDNA in which each individual ARMS face was metabarcoded separately rather than pooled. Metabarcoding detected ∼15× higher site-level richness and revealed stronger correlations with geographic distance and environmental gradients, whereas photography provided complementary information on macro-taxa and surface cover. For metabarcoding, processing each face separately yielded much higher richness and markedly stronger β-diversity–distance correlations than with the NOAA pooling protocol, demonstrating that pooling inflates sampling variance resulting in a loss of the ecological signal. Grouping faces into five structural categories offered a more operational alternative while further increasing α-diversity and strengthening β-diversity correlations. Overall, our results show that retaining ARMS microhabitat structure is critical for maximizing metabarcoding performance. Using five structural sessile fractions per ARMS combined with a control-driven bioinformatic workflow provides a reproducible, scalable framework for long-term eDNA monitoring and early detection of biodiversity change
Investigating Performer Uniqueness: The Case of Jascha Heifetz
No full textThis thesis is based on the conviction that the greatest musical performers of history can and should be granted the same level of academic scrutiny and study as is so often received by the greatest composers. Composers had the early advantage of producing durable manuscripts, while performers prior to the age of recording were unable to leave more than impressions in the minds of those who heard them. With the recent successes of numerous investigations into performance and recordings, including the CHARM and CMPCP projects, such studies are becoming ever more viable and significant.
The thesis focuses on the violinist Jascha Heifetz (1901-1987) and primarily his performances of the Bach solo violin works (BWV 1001-1006). While there have been studies of individual pieces, of particular performers, and of multiple recordings of the same piece, a study focussing on specific repertoire played by a specific performer is something that has been somewhat overlooked in the literature. The thesis draws on numerous methods to distil what is distinctive and unique about Heifetz. This includes an examination of what and how the performer played, why the performer played that way, and how that way of playing compares to other performers. The study concludes with a discussion of Heifetz’s unique performer profile in the context of violin performance history.
Focussing on one of the most famous and successful performing musicians of the twentieth century along with some of the most frequently played pieces, this case study will suggest research methods and approaches transferable to related studies. The thesis draws on original interviews with former Heifetz students, friends, and colleagues, and on over thirteen months of archival research in the Jascha Heifetz Collection held by the Library of Congress. This array of previously untapped material aided the analytical and empirical investigations into Heifetz’s uniqueness
