scholarly journals Czy w dzisiejszych czasach proste obserwacje mogą jeszcze znacząco zmieniać postrzeganie podstawowych zjawisk? Przypadek cieczy eutektycznych

2021 ◽  
pp. 47-54
Author(s):  
Danuta Raj
Keyword(s):  
Living Cells ◽  
Medical Sciences ◽  
Melting Points ◽  
Animal Tissues ◽  
Lipid Layer ◽  
Practical Observation ◽  
Pure Alcohol ◽  
Long Time ◽  
Made In

Can Simple Observations Today Still Significantly Change the Perception of Basic Phenomena? The Case of Eutectic Solvents The article presents a case study in which a simple, practical observation significantly changed the perception of basic phenomena regarding the mechanism of cell functioning, and thus was able to change the existing theory. This observation drew attention to the fact that the extract obtained from the dry plant substance with the use of pure alcohol, after distilling off the solvent, does not give a dry concentrated extract, and the viscous residue cannot be dried by distillation. This is a phenomenon that practically every phytochemist has encountered since the inception of this field of knowledge. It turned out that the explanation for the described phenomenon is the presence of eutectic solvents. Eutectic solvents are formed by mixing specific solid components, which liquefy without the addition of solvents, thanks to a significant lowering of the melting point of the mixture compared to the melting points of the starting materials. Although more than a hundred years have passed since the description of the above phenomenon, in the field of natural sciences, eutectic solvents have been treated as a curiosity for a long time, while in medical sciences – and more specifically in pharmacy – they were considered an inconvenience causing pharmaceutical incompatibilities. In fact, they are essential for the functioning of cells, enabling plants to develop frost resistance, being responsible for the ability to cryopreserve animal tissues, or allowing the dissolution of substances which are otherwise insoluble inside the cell in either the lipid layer or the aqueous part of the cell juice. The described discovery, made in 2011, allowed for a leap improvement in the understanding of the functioning of living cells.

Genetic factors in the conservation of seagrasses

1999 ◽  
Vol 5 (4) ◽  
pp. 269 ◽  
Author(s):  
Michelle Waycott
Keyword(s):  
Genetic Diversity ◽  
Population Genetic ◽  
Genetic Factors ◽  
Molecular Genetic ◽  
Seagrass Species ◽  
Evolutionary Origins ◽  
Long Time ◽  
Considerable Insight ◽  
Made In

Increasingly our awareness of seagrass conservation issues requires an understanding of population dynamics and knowledge of the ability of different species to recover from disturbance. Seagrass populations may recover vegetatively or through the establishment of sexually derived seedlings. Some understanding of the processes of population formation and maintenance can be obtained through population genetic surveys. With the advent of molecular genetic markers even genetically depauperate populations can be studied. Patterns of genetic variation can vary over the range of seagrass populations and with the type of marker used. A case study is presented which demonstrates the importance of surveying a significant range of species to better understand the patterns of genetic diversity present. Seagrass phylogeny needs to be improved before reliable taxonomic interpretations can be made in many seagrass groups. Uncommon or rare seagrass species require special attention to ascertain their evolutionary origins and the nature of their extant distributions. Studies of genetic factors may enhance our understanding of how seagrass populations survive over both short and long time scales and can provide considerable insight to the seagrass conservation strategist.

Chinese Culture Teaching For English Majors—A Case Study of Sun Tzu Culture

2017 ◽  
Vol 7 (3) ◽  
pp. 209
Author(s):  
Qianqian Wei
Keyword(s):  
Chinese Culture ◽  
Sun Tzu ◽  
English Majors ◽  
Culture Teaching ◽  
Teachers And Students ◽  
Long Time ◽  
Chinese And English ◽  
English Culture ◽  
Made In

It is universally admitted that English majors should learn about English culture and the teaching of Chinese culture has been neglected for a long time. The consequence is serious—as Chinese and English majors, most students cannot fluently express their own culture in English. Taking an essential part of Chinese culture—Sun Tzu culture as an example, the paper makes a research on the problem and suggests that joined efforts should be made in five aspects: the syllabus, the examination, the teaching, teachers and students.

scholarly journals Analysis of Dangerous Sea States in the Northwestern Mediterranean Area

2021 ◽  
Vol 9 (4) ◽  
pp. 422
Author(s):  
Alessio Innocenti ◽  
Miguel Onorato ◽  
Carlo Brandini
Keyword(s):  
Extreme Events ◽  
Mediterranean Area ◽  
Rayleigh Distribution ◽  
Surface Elevation ◽  
Wave Steepness ◽  
Sea Waves ◽  
Operational Forecasts ◽  
Long Time ◽  
Simulated Field

Extreme sea waves, although rare, can be notably dangerous when associated with energetic sea states and can generate risks for the navigation. In the last few years, they have been the object of extensive research from the scientific community that helped with understanding the main physical aspects; however, the estimate of extreme waves probability in operational forecasts is still debated. In this study, we analyzed a number of sea-states that occurred in a precise area of the Mediterranean sea, near the location of a reported accident, with the objective of relating the probability of extreme events with different sea state conditions. For this purpose, we performed phase-resolving simulations of wave spectra obtained from a WaveWatch III hindcast, using a Higher Order Spectral Method. We produced statistics of the sea-surface elevation field, calculating crest distributions and the probability of extreme events from the analysis of a long time-series of the surface elevation. We found a good matching between the distributions of the numerically simulated field and theory, namely Tayfun second- and third- order ones, in contrast with a significant underestimate given by the Rayleigh distribution. We then related spectral quantities like angular spreading and wave steepness to the probability of occurrence of extreme events finding an enhanced probability for high mean steepness seas and narrow spectra, in accordance with literature results, finding also that the case study of the reported accident was not amongst the most dangerous. Finally, we related the skewness and kurtosis of the surface elevation to the wave steepness to explain the discrepancy between theoretical and numerical distributions.

scholarly journals Non-destructive handheld XRF study of archaeological composite silver objects—the case study of the late Roman Seuso Treasure

2021 ◽  
Vol 13 (5) ◽  
Author(s):  
Viktória Mozgai ◽  
Bernadett Bajnóczi ◽  
Zoltán May ◽  
Zsolt Mráv
Keyword(s):  
Fluorescence Analysis ◽  
The Body ◽  
High Quality ◽  
X Ray ◽  
Composite Objects ◽  
Mechanical Attachment ◽  
Non Destructive ◽  
Made In ◽  
Late Roman

AbstractThis study details the non-destructive chemical analysis of composite silver objects (ewers, situlas, amphora and casket) from one of the most significant late Roman finds, the Seuso Treasure. The Seuso Treasure consists of fourteen large silver vessels that were made in the fourth–early fifth centuries AD and used for dining during festive banquets and for washing and beautification. The measurements were systematically performed along a pre-designed grid at several points using handheld X-ray fluorescence analysis. The results demonstrate that all the objects were made from high-quality silver (above 90 wt% Ag), with the exception of the base of the Geometric Ewer B. Copper was added intentionally to improve the mechanical properties of soft silver. The gold and lead content of the objects shows constant values (less than 1 wt% Au and Pb). The chemical composition as well as the Bi/Pb ratio suggests that the parts of the composite objects were manufactured from different silver ingots. The ewers were constructed in two ways: (i) the base and the body were made separately, or (ii) the ewer was raised from a single silver sheet. The composite objects were assembled using three methods: (i) mechanical attachment; (ii) low-temperature, lead-tin soft solders; or (iii) high-temperature, copper-silver hard solders. Additionally, two types of gilding were revealed by the XRF analysis, one with remnants of mercury, i.e. fire-gilding, and another type without remnants of mercury, presumably diffusion bonding.

scholarly journals Influence of the variability of the odour emission rate on its impact range: a case study of the selected industrial source

2019 ◽  
Vol 100 ◽  
pp. 00070 ◽  
Author(s):  
Elżbieta Romanik ◽  
Yaroslav Bezyk ◽  
Marcin Pawnuk ◽  
Urszula Miller ◽  
Agnieszka Grzelka
Keyword(s):  
Emission Rate ◽  
Dispersion Model ◽  
Grid Size ◽  
Model Calculations ◽  
Gas Treatment ◽  
Industrial Source ◽  
Odour Concentration ◽  
Made In ◽  
Dynamic Olfactometry

Odour concentration measurements in a chosen industrial source were made in this study using the method of dynamic olfactometry. The two different scenarios considered the variation of the odour emission rate as input for the dispersion model were compared for the period 2017 (before installation of the equipment for gas treatment) and 2018 (after implementation of purifying technologies). In this paper the odour impact range was determined by applying model calculations conducted in the Polish reference dispersion model – OPERAT FB software for the grid size 2 x 2 km. The conducted research shows a significant improvement in the odour impact range of chosen industrial source in year 2018 compared to 2017.

Introducing Problem-based Learning to Special Needs Dentistry—A Case Study

2002 ◽  
Vol os9 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Raman Bedi ◽  
Jackie A Champion ◽  
Roger Davies
Keyword(s):  
Special Needs ◽  
Problem Based Learning ◽  
Chi Square ◽  
Training And Education ◽  
Mixed Response ◽  
Conventional Teaching ◽  
The Subject ◽  
Better Than ◽  
Made In

Introduction In order to promote training and education in special-needs dentistry an attempt was made to introduce problem-based learning (PBL) as a method of postgraduate dental education. The aim of this paper was to review the principles of PBL and report on a case study using this methodology. Method The case study was of a PBL session, on the subject of ‘problems of obtaining appropriate dental care for people with epilepsy’, undertaken at a national conference. Delegates were asked to complete a pre- and post-session questionnaire on PBL and their attitudes to the session. Results The session received a mixed response. Only 33 (35%) thought the session was valuable and only 20 (31%) thought it was better than conventional teaching methods and yet over half (55%) said they would like to attend more PBL in special-needs dentistry. Professionals complementary to dentistry were more likely to find the PBL session of value and to prefer the method to a more conventional format than dentists were (chi-square=5.5, df=1, p<0.05 and chi-square=5.9, df=1, p<0.05 respectively). Conclusion Valuable feedback was received from delegates. This will enable improvements to be made in future courses so that the effectiveness of PBL can be optimised.

The "Right to Die": A Case Study in American Lawmaking*

1996 ◽  
Vol 3 (1) ◽  
pp. 49-74
Author(s):  
Alan Meisel
Keyword(s):  
Legal System ◽  
Right To Die ◽  
Judicial Process ◽  
Clinical Issue ◽  
The Press ◽  
American Law ◽  
American Legal System ◽  
The Right ◽  
Made In

AbstractIn the 20 years that have passed since the Karen Quinlan case exposed a simmering clinical issue to the light of day — more precisely, to the press and to judicial process — a consensus has developed in American law about how end-of-life decisionmaking should occur. To be sure, there are dissenting voices from this consensus, but they are often (though not always) about minor issues. By illustrating how this consensus has evolved, this paper explores how law is made in the American legal system and the roles that different legal and extra-legal institutions play in lawmaking.

Case Study Comparison: Limitations in Telehealth Relating to Poverty and Family Support

2021 ◽  
Vol 42 (02) ◽  
pp. 158-164
Author(s):  
Lindsey E. Jorgensen ◽  
Rachel E. Barrett
Keyword(s):  
Family Support ◽  
Pediatric Patients ◽  
Internet Access ◽  
Smart Devices ◽  
Internet Connection ◽  
The Third ◽  
Global Pandemic ◽  
Internet Connections ◽  
Made In

AbstractTelehealth appointments have grown in popularity due to the COVID-19 global pandemic. Three cases presented in this article show several different perspectives where telehealth was utilized. For the first patient, appointments were successfully completed via telehealth; however, the patient's family opted to continue with an unsecure internet connection at a local laundromat. For the second patient, a stable internet connection could not be obtained in his home, thus making telehealth appointments unavailable. The caregiver of this patient ended up driving to the clinic to have adjustments made in person. For the third patient, telehealth appointments were unavailable due to unstable internet connections as well as difficulty setting up video interpreting services. These cases highlight the idea that telehealth can be incredibly beneficial, when used correctly. For some, the option to attend appointments virtually gives them access to specialists that otherwise may not be available. For other patients, aspects such as access to smart devices and steady internet access must be considered to ensure a successful connection. The hope is that this article sheds light on some of the potential setbacks that can come from the use of telehealth appointments in a practice and provides discussion regarding for whom telehealth may be appropriate, even in pediatric patients. After reading this article, readers should be able to discuss ways in which there could be solutions for these barriers that may prevent some patients from utilizing these types of virtual appointments.

Translation policy

2021 ◽  
Vol 7 (3) ◽  
pp. 339-369
Author(s):  
Alireza Jazini
Keyword(s):  
End Users ◽  
Reception Theory ◽  
Audience Reception ◽  
Policy Network ◽  
Top Down ◽  
Bottom Up ◽  
Policy Model ◽  
Subsequent Research ◽  
Made In

Abstract The translation policy model by González Núñez (2013, 475) comprises three elements, namely “translation management”, “translation practices”, and “translation beliefs”. While the first two elements of this model are straightforward and easy to study in top-down approaches, translation beliefs can relate both to policymakers and policy receivers. However, the distinction has not been clearly made in this model and the element of translation beliefs has been chiefly treated in the literature as though it comes from the top levels of policymaking, hence overlooking the bottom-up aspects of it (see González Núñez 2014, 2016; Li et al. 2017). In order to improve this model, the present paper draws on the audience reception theory (Hall 1973), and shows that the current translation policy model requires a fourth element that I would call ‘translation reception’. The paper draws on the findings of a reception-oriented case study on translation policies in provincial broadcasting in Iran. This study argues that a more inclusive model of translation policy should not only include the authority-level elements of translation management, translation practices, and translation beliefs, but also the element of translation reception on the part of policy receivers. This way, I hope, the end users’ involvement in and contribution to the translation policy network will not be overlooked in subsequent research.

Productivity analysis of education and research fields in universities of medical sciences: a case study of Iran

2021 ◽  
Vol 34 (2) ◽  
pp. 266
Author(s):  
Bahram Nabilou ◽  
Hassan Khorsandi ◽  
Ali Reza Chavshin ◽  
Aram Feizi ◽  
Hasan Yusefzadeh
Keyword(s):  
Productivity Analysis ◽  
Medical Sciences ◽  
Research Fields
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