scholarly journals Accumulation and Release of Mercury in the Lichen Evernia prunastri (L.) Ach

Biology ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1198
Author(s):  
Andrea Vannini ◽  
Muhammad Bilal Jamal ◽  
Margherita Gramigni ◽  
Riccardo Fedeli ◽  
Stefania Ancora ◽  
...  
Keyword(s):  
Botanical Garden ◽  
Exposure Concentration ◽  
Model Species ◽  
Evernia Prunastri ◽  
Pollution Episode ◽  
The University ◽  
Over Time

This study investigated the dynamics of the accumulation and release of Hg2+ in lichens, using Evernia prunastri (L.) Ach. as a model species. Thalli were incubated with solutions containing 1, 10, and 100 µM Hg2+ and then exposed for 1, 2, 3, 6, 12, 18, and 24 months at the Botanical Garden of the University of Siena (a location free from local Hg sources). Lichen samples accumulated Hg proportionally to the exposure concentration, and after the exposure, reductions over time were evident, already starting from 1–2 months. After 24 months, samples released 72–74 (healthy thalli) to 94% (unhealthy thalli) of the accumulated Hg, but control values of untreated samples were never reached. Depending on the Hg content after the exposure, stable decreased concentrations were reached after 6–24 months. The results of this study highlight the ability of the lichen E. prunastri to reflect rapidly increasing environmental Hg concentrations, as well as to indicate an ameliorated situation (e.g., the closure of an Hg source). However, we have found evidence that an acute pollution episode can influence the content of Hg in lichens for several years.

scholarly journals Accumulation and Phytotoxicity of Two Commercial Biocides in the Lichen Evernia prunastri and the Moss Brachythecium sp.

Stresses ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 69-77
Author(s):  
Andrea Vannini ◽  
Giulia Canali ◽  
Sergio Enrico Favero-Longo ◽  
Stefano Loppi
Keyword(s):  
Benzalkonium Chloride ◽  
Photosynthetic Apparatus ◽  
Model Species ◽  
Evernia Prunastri ◽  
Active Compounds ◽  
Severe Impairment ◽  
Over Time

This study investigated the accumulation and phytotoxicity of two commercial biocides widely used for the removal of biological colonization from monuments, namely Biotin T® (3%) and Preventol RI80® (2%), on lichen and moss model species, specifically, Evernia prunastri and Brachythecium sp. The active compounds, benzalkonium chloride (BAC) for Preventol RI80 and isothiazolinone (OIT) for Biotin T, were accumulated in similar amounts in both species without significant changes for up to 21 days. Both compounds caused a severe impairment of the photosynthetic apparatus of these species, without any recovery over time, although Biotin T showed a faster and stronger action, and the moss was more sensitive than the lichen. By shedding light on the accumulation of BAC and OIT in lichens and mosses and quantifying their effectiveness to photosynthetically devitalize these organisms, the obtained results are a useful comparison for the implementation of green alternative products for the control of biodeteriogens.

Comparison of the trace element content in transplants of the lichen Evernia prunastri and in bulk atmospheric deposition: a case study from a low polluted environment (C Italy)

Biologia ◽  
2015 ◽  
Vol 70 (4) ◽  
Author(s):  
Stefano Loppi ◽  
Luca Paoli
Keyword(s):  
Trace Element Content ◽  
Botanical Garden ◽  
Bulk Deposition ◽  
Remote Site ◽  
Evernia Prunastri ◽  
Icp Ms ◽  
Bulk Atmospheric Deposition ◽  
The One ◽  
The University

AbstractThis study investigated whether lichen samples transplanted and retrieved monthly for six months reflect bulk deposition under conditions of relatively low air pollution. The study investigated also whether samples exposed for six months provide data consistent with the one-month transplants. The lichen Evernia prunastri was collected from a remote site and exposed at a study site (the Botanical Garden of the University of Siena, Italy), along with an atmospheric bulk deposition collector. Lichens and bulk deposition were analysed by ICP-MS for the content of Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Sb, Ti and Zn. The results showed significant correlations between lichen content and bulk deposition for Al, As, Cu, Fe, Hg, Sb and Ti, suggesting that in one month the equilibrium is reached for these elements between the lichen and the atmosphere. The above elements (but Sb) in lichen and bulk deposition are related to soil-particulates, while traffic is the source for Sb deposition. In addition, samples exposed for 6 months showed results consistent with the one-month transplants for As, Cu and Hg, suggesting that for these elements in the study site the equilibrium is maintained also for longer periods.

16th and 17th Workshops of the International Association of Vegetation Science Working Group for the European Vegetation Survey (Rome, Italy, 22-26 March 2007; Brno, Czech Republic, 1-5 May 2008)

2008 ◽  
pp. 131-133
Author(s):  
T. M. Lysenko ◽  
Yu. A. Semenishchenkov
Keyword(s):  
Czech Republic ◽  
Working Group ◽  
International Association ◽  
Botanical Garden ◽  
European Countries ◽  
Vegetation Survey ◽  
Vegetation Science ◽  
The University ◽  
Science Working

22-26 March 2007 in Rome (Italy), in the Botanical garden of the University «La Sapienza» hosted the 16th meeting of the Working group «Review of the Vegetation of Europe» of the International Association of Vegetation Science (IAVS). These meetings are held every spring in one of the European countries and dedicated to various topics.

Correlating entrance data and first year academic performance of students enrolled in the Integrated Master in Mechanical Engineering at the University of Porto

2021 ◽  
pp. 030641902110156
Author(s):  
TMGP Duarte ◽  
AM Lopes ◽  
LFM da Silva
Keyword(s):  
Academic Performance ◽  
Secondary School ◽  
Undergraduate Students ◽  
Mechanical Engineering ◽  
Institutional Factors ◽  
First Year ◽  
Female Type ◽  
The University ◽  
First Year University ◽  
Over Time

Understanding how the academic performance of first year undergraduate students is influenced by home, personal and institutional factors is fundamental to delineate policies able to mitigate failure. This paper investigates possible correlations between the academic performance of students at the end of high school with their achievements at the end of first year university. Data for students in the Integrated Master in Mechanical Engineering (MIEM) program within the Faculty of Engineering at the University of Porto are analysed for the period 2016/2017 to 2019/2020. The students’ performance is measured by two metrics and the students are structured as a whole and by groups, according to their gender (Male/Female), type of secondary school (Public/Private), living place (Away/Home) and the rank of MIEM in their application list of options (Option 1/Option 2–6). The information is organized statistically and possible correlations between the data are investigated. The analysis reveals limited correlation between the two metrics, meaning that all students may exhibit good or poor results at the end of first year in MIEM, independent of their status at entrance. An unanticipated pattern is exhibited for the group Option 2–6, since it shows that, despite entering into MIEM without top application marks, the students in this group can perform as well as the others. This behavior is consistent over time.

Canada’s changing innovation landscape

2021 ◽  
Author(s):  
Md. Razib Alam ◽  
Bonwoo Koo ◽  
Brian Paul Cozzarin
Keyword(s):  
The United States ◽  
Destination Country ◽  
Firm Level ◽  
Individual Level ◽  
Patent Classification ◽  
The Usa ◽  
The Government ◽  
The Individual ◽  
The University ◽  
Over Time

Abstract Our objective is to study Canada’s patenting activity over time in aggregate terms by destination country, by assignee and destination country, and by diversification by country of destination. We collect bibliographic patent data from the Canadian Intellectual Property Office and the United States Patent and Trademark Office. We identify 19,957 matched Canada–US patents, 34,032 Canada-only patents, and 43,656 US-only patents from 1980 to 2014. Telecommunications dominates in terms of International Patent Classification technologies for US-only and Canada–US patents. At the firm level, the greatest number of matched Canada–US patents were granted in the field of telecommunications, at the university level in pharmaceuticals, at the government level in control and instrumentation technology, and at the individual level in civil engineering. We use entropy to quantify technological diversification and find that diversification indices decline over time for Canada and the USA; however, all US indices decline at a faster rate.

scholarly journals The History of the Language and the History of the Nation

2020 ◽  
Vol 16 (2 (22)) ◽  
pp. 106-118
Author(s):  
Gabriella Macciocca
Keyword(s):  
Political Thought ◽  
Italian Literature ◽  
The Political ◽  
Italian Language ◽  
Deep Knowledge ◽  
Linguistic History ◽  
History Of ◽  
The University ◽  
Over Time

The history of the language represents a moment of deep knowledge in the development of the political thought of the Nation. With regard to the Italian language, we must recognize observations and summaries of linguistic history produced ever since the origins of the language itself. A short number of examples, coming from the history of the Italian language, and from the history of Italian literature, will be considered. We will consider in which way the language has been taught over time and the University statement.

scholarly journals Survival probabilities of first and second clutches of blackbird (Turdus merula) in an urban environment

2010 ◽  
Vol 62 (2) ◽  
pp. 489-493 ◽  
Author(s):  
Kornelia Kurucz ◽  
Helena Kallenberger ◽  
Csilla Szigeti ◽  
J.J. Purger
Keyword(s):  
Urban Environment ◽  
Small Mammals ◽  
Breeding Success ◽  
Survival Probability ◽  
Botanical Garden ◽  
Hedera Helix ◽  
Artificial Nests ◽  
The Difference ◽  
The University ◽  
Predation Rates

The breeding success of blackbirds was investigated in April and June 2008 and 2009 in the Botanical Garden of the University of Pecs, with a total of 50 artificial nests at each of the four sessions (with 1 quail egg and 1 plasticine egg placed in every nest). In all four study periods of the two years, 2 nests (4%) were destroyed by predators. Six nests (12%, of the nests) were not discovered in either of the cases. The survival probability of artificial nests was greater in April than in June (both years), but the difference was significant only in 2008. Nests placed into a curtain of ivy (Hedera helix) on a wall were located higher up than those in bushes, yet their predation rates were quite similar. The predation values of quail vs. plasticine eggs did not differ in 2008. In the year 2009, however, significantly more quail eggs were discovered (mostly removed), than plasticine eggs. Marks that were left on plasticine eggs originated mostly from small mammals and small-bodied birds, but the disappearance of a large number of quail and plasticine eggs was probably caused by larger birds, primarily jays.

scholarly journals Poisonous and Narcotic Flora in the Gaza Strip-Palestine / A Review

2019 ◽  
pp. 1-12
Author(s):  
Akram Atalla ◽  
Ayman Dardona
Keyword(s):  
Herbal Medicine ◽  
Medicinal Plants ◽  
National Parks ◽  
Gaza Strip ◽  
Botanical Garden ◽  
Poisonous Plants ◽  
The Public ◽  
Current Article ◽  
The Gaza Strip ◽  
The University

There are numerous known medicinal plants in the Gaza strip flora, some of them are used in the traditional medicine but despite extensive studies of plants either wild or cultivated in Palestine, only a few articles are reported with the phytochemistry of these plants especially the poisonous flora. The current article presents the most common and important poisoning plants in the Gaza strip flora which are therefore important for the public to know and for research and awareness. This review is considered the first study that working in some details with the poisonous plants in the Gaza strip flora in terms of botany, phytochemistry and herbal medicine. These plants are distributed in several habitats in the Gaza strip, including Wadi Gaza, coastal areas, dunes, roadsides, national parks and the botanical garden in the University of Palestine.

scholarly journals En aksjonsforskningsstudie av samarbeid i grensesoner – betydningen av deltakernes forventninger

2020 ◽  
pp. 573-597
Author(s):  
Elisabeth Stenshorne ◽  
Janne Madsen
Keyword(s):  
Action Learning ◽  
Development Project ◽  
Learning Study ◽  
School Practices ◽  
Resource Teachers ◽  
Professional Boundaries ◽  
School Based ◽  
Cultural Historical Activity ◽  
The University ◽  
Over Time

Based on a specific, school-based development project this article reflects on the participants’ experiences of the process. Experiences are discussed with particular emphasis on expectations from three school leaders, teachers, resource teachers and the university mentors. These participants all joined with different experiences and possibilities. In this case, the mentors from the university are also the researchers. The participants worked across their professional boundaries. Cultural historical activity theory is the framework for gathering and analyzing data and for the collaboration between the participants. Narratives in this action learning study show how expectations support practitioners` involvement and motivation for improvement, which in turn contributes to changing the school practices. Furthermore, when different actors cross boundaries and meet over time in a third space, the dialogue is challenged and refined, and creativity and knowledge trigger new insights and understanding.

Djalkiri

2021 ◽  
Keyword(s):  
20Th Century ◽  
Early 20Th Century ◽  
Philosophical Foundations ◽  
Collaborative Community ◽  
Arnhem Land ◽  
New Type ◽  
The University ◽  
The Relationship ◽  
Over Time

Djalkiri are “footprints" – ancestral imprints on the landscape that provide the Yolŋu people of eastern Arnhem Land with their philosophical foundations. This book describes how Yolŋu artists and communities keep these foundations strong, and how they have worked with museums to develop a collaborative, community-led approach to the collection and display of their artwork. It includes contributions from Yolŋu elders and artists as well as Indigenous and non-Indigenous historians and curators. Together they explore how the relationship between communities and museums has changed over time. From the early 20th century, anthropologists and other collectors acquired artworks and objects and took photographs in Arnhem Land that became part of collections at the University of Sydney. Later generations of Yolŋu have sought out these materials and, with museum curators, proposed a new type of relationship, based on a deeper respect for Yolŋu intellectual frameworks and a commitment to their central role in curation. This book tells some of their stories.

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