The material strategy of fire-resistant tree barks

<p>The finer fraction of the particulate matter (PM) is the most harmful health wise, as it has more capacity to reach deeper parts of the respiratory system. Among other constituents, PM also contains iron oxides, allowing for the use of magnetic methods in its investigation as proxies for the whole of PM. Those methods present advantages in comparison to traditional ones, being quick, cost effective and sensible to investigate iron oxides among PM.&#160;</p><p>To better understand the risks related to PM exposition in the domestic context, the assessment of magnetic parameters may be used in outdoor and indoor environments, giving us information on the concentration of iron oxides (and consequently, PM) and its dispersion from one environment to the other.&#160;</p><p>We developed a citizen sciences experiment in the city of Toulouse, France. Tree barks were used as bio-collectors. Garlands composed of tree bark pieces were distributed to the population in May-2019, and placed in both indoors and outdoors of flats and homes to capture PM. They were retrieved after one year. Measurement of magnetic susceptibility, ARM, SIRM, S -ratio and estimation of superparamagnetic concentration were performed. A total of 86 bio-collectors kits were successfully analyzed. The preliminary results indicate a higher concentration of iron oxides outdoors, with a mean difference between outdoor and indoor measurements of 6.58x10<sup>-9</sup>m<sup>3</sup>/kg and 1.38x10<sup>-5</sup>Am<sup>2</sup>/kg in susceptibility and SIRM respectively. The concentration of the SP fraction also follows this trend of higher outdoor values. The magnetic mineralogy is mostly dominated by low coercivity magnetite-like carriers.</p><div> <div> <div>&#160;</div> </div> <div> <div>&#160;</div> </div> </div>

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Evaluación del Daño y Restauración de los Árboles Después de un Huracán

EDIS ◽

10.32473/edis-ep305-2006 ◽

2006 ◽

Vol 2006 (18) ◽

Author(s):

Edward F. Gilman ◽

Mary L. Duryea ◽

Eliana Kampf ◽

Traci Jo Partin ◽

Astrid Delgado ◽

...

Keyword(s):

Management Practices ◽

Urban Forest ◽

Spanish Language ◽

Usda Forest Service ◽

Language Version ◽

Full Color ◽

Pine Trees ◽

Resistant Tree ◽

Recovery Program ◽

Effective Design

ENH-1037, a 16-page full-color fact sheet by Edward F. Gilman, Mary L. Duryea, Eliana Kampf, Traci Jo Partin, Astrid Delgado, and Carol Lehtola is the Spanish language version of ENH-1036, "Assessing Damage and Restoring Trees after a Hurricane", funded by the Florida Division of Forestry and the USDA Forest Service, Southern Region as part of the Urban Forest Hurricane Recovery Program. Includes sections with guidelines for chainsaw safety, how to hire tree care professionals, how to tell which damaged trees can recover and which should be removed, how to restore trees to health after a hurricane by pruning -- both immediately after the storm and after few years' growth, specialized information for dealing with palm and pine trees, how to prevent damage by using effective design and management practices, and lists of decay resistant and wind resistant tree species for Florida. Published by the UF Department of Environmental Horticulture, July 2006.

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Assessment of heavy metal content in tree barks: Picea abies, Pinus sylvestris, and Pinus nigra (RETRACTED)

BioResources ◽

10.15376/biores.16.3.5047-5057 ◽

2021 ◽

Vol 16 (3) ◽

pp. 5047-5057

Author(s):

Corneliu Tanase ◽

Adrian Nisca ◽

Argeime Lopez

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Picea Abies ◽

Pinus Sylvestris ◽

Metal Content ◽

Biological Activities ◽

Pinus Nigra ◽

Heavy Metal Content ◽

Potential Health ◽

Tree Barks

Extracts obtained from the bark of woody plants are used for their high content in polyphenolic compounds with various biological activities. Thus, it is important to evaluate the heavy metals in various tree barks, as these pollutants may end up in the final product, affecting its properties and having potential health implications. This study assessed the heavy metal content in the barks of spruce (Picea abies) and pine (Pinus sylvestris and Pinus nigra) collected from different areas in Romania. After collecting the vegetal material from different sites, the bark samples were appropriately processed and analyzed via inductively coupled plasma optical emission spectroscopy (ICP-OES). The results showed that 6 out of 8 tested samples exceeded the normal values of selenium (Se). Arsenic (As) and cadmium (Cd) were not detected in any sample, while other metals (chromium (Cr); lead (Pb); nickel (Ni)) were detected in variable amounts. Moreover, relatively high levels of heavy metals were recorded in a spruce bark sample collected from the seemingly most unpolluted site. Although further studies are needed to determine the effects of these heavy metals on extraction yields and their transfer into the final extracts, their presence might indicate a potential problem.

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Diversity and Species Composition of Subaerial Algal Communities in Forested Areas of Meghalaya, India

International Journal of Biodiversity ◽

10.1155/2014/456202 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 8

Author(s):

Diana Kharkongor ◽

Papiya Ramanujam

Keyword(s):

Relative Humidity ◽

Species Composition ◽

Algal Species ◽

Sacred Grove ◽

Algal Communities ◽

Tree Barks ◽

Significant Difference ◽

Forested Areas ◽

Mixed Plantation ◽

Disturbed Forest

The study deals with a comparative study on diversity and species composition of subaerial algal communities from tree barks of closed undisturbed sacred grove, mixed plantation, and open disturbed forest. A total of 85 taxa had been recorded, 30 cyanobacteria and 55 algal species belonging to six classes of algae. Sacred grove harboured the highest subaerial algal diversity compared to those of plantation and open disturbed forest. There was a strong significant difference in species composition among the three different sampling areas. High number of diatoms with 14 species was recorded in sacred grove. Cyanobacteria with 22 species were the frequent group in disturbed forest whereas Trentepohliales dominated in plantation. Canonical correspondence analysis confirmed that high photon irradiance favored the growth of cyanobacteria in disturbed forest. The abundance of Trentepohliales members correlated to high rainfall and photon irradiance. High diversity and presence of many diatom species in undisturbed Mawphlang sacred grove were associated with low photon irradiance and high relative humidity and could also be due to a presence of suitable substrata formed by the growth of mosses. Sunlight, relative humidity, and rainfall were the important factors which played a major role in determining the diversity and distribution of subaerial algal communities.

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