383 research outputs found
An Investigation of Aural Space inside Mousa Broch by Observation and Analysis of Sound and Light
No full textThis project emphasises the unique character and construction of Mousa broch, questions the model of Mousa broch as a roofed home (an interpretation adopted by Historic Scotland in 2002) and considers the way in which sound and light informs our understanding of the spaces contained within its structure. Underpinning the approach to data collection was the architectural concept of aural space. The author attempts to convey an impression of aural space inside Mousa broch by the creation of an audio-visual record supported by acoustic analysis, archaeological discussion, and an architectural breakdown of the spaces within the broch structure. Audio recordings, sound samples, photographs and movies were made on Mousa island and inside Mousa broch during the period of the Summer solstice of 2009
Author Correction: the Influence of Nano Filter Elements on Pressure Drop and Pollutant Elimination Efficiency in Town Border Stations
No full textThe original version of this Article contained an error in the order of the author names, which was incorrectly given as Hamed Ebadiyan, Saeed Zeinali Heris, Seyed Borhan Mousavi, Shamin Hosseini Nami ; Mousa Mohammadpourfard. Consequently, in the Author Contributions section, “H.E. Investigation. S.Z.H. Supervision, Conceptualization, Methodology, Validation. S.B.M. Formal analysis, Writing original draft. S.H.N. Formal analysis, Writing original draft. M.M. Validation.” now reads: “S.Z.H. Supervision, Conceptualization, Methodology, Validation. H.E. Investigation. S.B.M. Formal analysis, Writing original draft. S.H.N. Formal analysis, Writing original draft. M.M. Validation.” The original Article has been corrected. © 2023, The Author(s)
Evaluation of plant-mediated Silver nanoparticles synthesis and its application in postharvest Physiology of cut Flowers
No full textSYNTHESIS OF C-GLYCOSYL AMINO ACIDS AS STABLE BUILDING BLOCKS FOR MODIFIED GLYCOPEPTIDE SYNTHESIS
No full textIn this thesis, we have studied and synthesized new class of C-glycosly amino acids whose structure features a
hetrocycle ring holding the carbohydrate and the amino acid fragments. Pyridine and tetrazole rings were used as
hetrocycle linkers in this project. This class of C-glycosyl amino acids is of interest as new chealtors and as building
building blocks for cotranslational glycopeptides synthesis. In the first part, C-Glycosylmethyl pyridylalanines were
synthesized via thermally induced Hantzsch-type cyclocondensation using an aldehyde-ketoester-enamino ester system.
To one of these reagents was attached a C-glycosyl residue, while to another was bound an amino acid fragment. In a
one-pot optimized methodology, the dihydropyridine was not isolated while its purification was carried out by removal
of unreacted material and side products using polymer-supported scavengers. Then the dihydropyridine (mixture of
diastereoisomers) was oxidized by a polymer-bound oxidant to give the target pyridine bearing the two bioactive
residues. In this way, a range of eight compounds (58-68% yield) was prepared in which the elements of diversity were
(i) the gluco and galacto configurations of the pyranose ring, (ii) the α- and β-configurations at the anomeric center, and
(iii) the positions of the carbohydrate and amino acid sectors in the pyridine ring. The orthogonal functional group
protection in these amino acids allowed their easy incorporation into oligopeptides via sequential amino and carboxylic
group coupling.
In the second part, tetrazole moiety was constructed via Huisgen 1,3-dipolar cycloaddition between nitriles and organic
azides. Two sets of compounds have been prepared, one being constituted of C-galactosyl and C-ribosyl O-tetrazolyl
serines, while the other contains S-tetrazolyl cysteine derivatives. In both cases, the synthetic scheme involved a twostep
route: the first one being the thermal cycloaddition of a sugar azide with p-toluensulfonyl cyanide (TsCN) to give a
1-substituted 5-sulfonyl tetrazole and the second the replacement of the tosyl group with a serine or cysteine residue.
For the high efficiency and operational simplicity, the azide-TsCN cycloaddition appears to be a true click process.
Finally, one of the amino acids prepared was incorporated into a tripeptid
The application of new environmentally friendly compounds on postharvest characteristics of cut carnation (Dianthus caryophyllus L.)
No full textApplication of Biogenic and Non-biogenic Synthesized Metal Nanoparticles on Longevity of Agricultural Crops
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بررسی وجود آلودگی مس در لایه سطحی خاک تاکستان های ملایر
No full textBackground and Aims: Soil contamination by copper (Cu) very often occurs in the soil surface layer of vineyard cultivations, due to the heavy use of copper fungicides in order to protect against fungal grape diseases. The objective of this study was therefore to evaluate copper concentration in the superficial layer of vineyard cultivation in Malayer, Iran, and also to prepare the pollution map of copper in this region.Materials and Methods: Twenty five surface soil samples (0-20 cm) of Malayer vineyard region were collected and consequently were subjected to Cu concentration assessment. Soil samples were air dried and sieved, and the categorized <0.149 mm fraction was used in subsequent digestion operation. The concentrations of Cu in extracted solutions were determined by Flame Atomic Absorption Spectrophotometry. The inverse distanceweighting (IDW) method was used to interpolate copper concentrations in the whole study area owing to the limited amount of data.Results: The low concentrations of copper in the range of 3.95 to 15.09 mg/kg with a mean value of 7.36 mg/kg were noticed in the studied vineyard soils. The total Cu concentrations were generally similar to those reported for natural soils.Conclusion: Observed low concentrations of copper in studied vineyard cultivations and indeed homogeneous distribution of copper in the soil, implies that the copper concentrations were controlled by geological processes. Heterogeneous distribution of Cu in the small part of southern region could be linked with anthropogenic impacts.زمينه و هدف: آلودگي فلزي خاک به ويژه توسط مس پديدهاي است که اغلب در لايه سطحي خاکهاي تاکستان به دليل استفاده مکرر از قارچ کش هاي مسي براي کنترل بيماريهاي انگور اتفاق ميافتد. هدف از اين پژوهش بررسي غلظت مس در خاک سطحي باغهاي انگور ملاير و تهيه نقشه آلودگی مس در منطقه مورد مطالعه بود.
مواد و روشها: براي ارزيابي وضعيت مس 25 نمونه خاک سطحی از لايه 0 تا 20 سانتيمتر تاكستانهاي ملاير برداشت شد. همه ﻧﻤﻮﻧﻪﻫﺎي ﺧﺎک در ﻫﻮاي آزاد ﺧﺸﮏ شده و پس از الک شدن، ذرات کمتر از 149/0 ميليمتر براي عمليات هضم استفاده شدند. غلظت مس در نمونههای خاک توسط دستگاه جذب اتمي به روش شعله تشخیص داده شد. روش وزندهي فاصله معکوس براي درونيابي غلظت مس در کل منطقه مورد مطالعه به دليل دادههاي محدود به کار برده شد.
يافتهها: غلظتهاي پاييني از مس در خاک تاکستان شناسايي شده است به گونهاي که دامنه غلظت مس در اين خاکها بين 95/3 تا 09/15 mg/ kg با ميانگين 36/7 بود. به طور کلي غلظت مس در خاک باغهاي انگور ملاير مشابه با غلظت گزارش شده براي خاکهاي طبيعي بود.
نتيجه گيري: مقادير پايين غلظت مس در خاک تاکستانها از یک طرف و از طرف دیگر نقشه کمابیش همگن پراکنش غلظت مس در آنها حاکی از آن است که غلظت مس در منطقه به دست فرآيندهاي زمين شناسي کنترل ميشود. توزيع ناهمگون غلظت مس در بخش کوچکی از جنوب منطقه نشان دهنده اثرات انساني است
Biomonitoring of airborne Cu, Pb, and Zn in an urban area employing a broad leaved and a conifer tree species
No full textRole of irrigation water, inorganic and organic fertilizers in soil and crop contamination by potentially hazardous elements in intensive farming systems: Case study from Moghan agro-industry, Iran
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