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Author: United States. Congress. House. Committee on Coinage, Weights, and Measures
Publisher:
ISBN:
Category : Bimetallism
Languages : en
Pages : 554
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Book Description
Author: United States. Congress. House. Committee on Coinage, Weights, and Measures
Publisher:
ISBN:
Category : Bimetallism
Languages : en
Pages : 554
Get Book Here
Book Description
Author: United States. Congress. House. Committee on coinage, weights & measures
Publisher:
ISBN:
Category :
Languages : en
Pages : 620
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Book Description
Author: United States Congress House Committee on Coinage, Weights, and Measures
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: United States. Congress. House. Committee on Coinage, Weights, and Measures
Publisher:
ISBN:
Category : Silver question
Languages : en
Pages : 172
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Book Description
Author: United States. Congress. House. Committee on coinage, weights & measures
Publisher:
ISBN:
Category :
Languages : en
Pages : 546
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Book Description
Author: Elmer Walter Pehrson
Publisher:
ISBN:
Category : Copper
Languages : en
Pages : 20
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Book Description
Author: Iqbal Ahmad
Publisher: Springer Science & Business Media
ISBN: 144197931X
Category : Technology & Engineering
Languages : en
Pages : 522
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Book Description
This book focuses on successful application of microbial biotechnology in areas such as medicine, agriculture, environment and human health.
Author: Jingfu Liu
Publisher: Springer
ISBN: 366246070X
Category : Science
Languages : en
Pages : 161
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Book Description
This comprehensive book covers the environmental issues concerning silver nanoparticles (AgNPs). Following an introduction to the history, properties and applications, the environmental concerns of AgNPs is discussed. In the second chapter, the separation, characterization and quantification of AgNPs in environment samples are described in detail. In the remaining parts of the book, the authors focus on the environmental processes and effects of AgNPs, with chapters on the pathway into environment, fate and transport, toxicological effects and mechanisms, as well as the environmental bioeffects and safety-assessment of AgNPs in the environment. This book is designed to describe current understanding of the environmental aspects of AgNPs. It provides a valuable resource to students and researchers in environmental science and technology, nanotechnology, toxicology, materials science and ecology; as well as to professionals involved in the production and consumption of AgNPs in various areas including catalysis, food products, textiles/fabrics, and medical products and devices. Jingfu Liu and Guibin Jiang are professors at State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences.
Author: Daniel Clyde Rearick
Publisher:
ISBN:
Category :
Languages : en
Pages : 308
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Book Description
The potential release of nanoparticles into aquatic environments is raising global concerns. As antimicrobials, silver nanoparticles (AgNPs) are among the most prominent form in use. Despite this, their fate, long-term toxicity, and ecological relevance have yet to be investigated largely under natural settings with seasonality and environmental complexity. To better understand the environmental significance, we released AgNPs into Lake 222 at the Experimental Lakes Area over two years. AgNPs remained suspended in the water column and were detected throughout the lake and in the lower food web. Total Ag concentrations ranged from below 0.07 to 18.9 ?g L-1 in lake water, and were highly dynamic seasonally both in the epilimnion and hypolimnion depending on the physical, chemical and biological conditions of the lake. Approximately 60% of the measured Ag mass in October was present in the sediment in 2014 and 50% in 2015 demonstrating relatively high sedimentation and removal from the water column. During winter months, Ag was largely absent in the water column under the ice. After ice melt and before summer stratification, Ag concentrations increased in the lake suggesting AgNPs may not be tightly bound to the sediment and are able re-enter the water column during spring mixing events. Despite temporal variation, total Ag was highly synchronous across spatial locations for both years, indicating rapid dispersal upon lake entry. When investigating AgNP sizes using spICPMS, size distributions were similar across spatial locations, with the 40-60 nm size class constituting approximately 60% of all particles iii identified. Large aggregates (>100 nm) and dissolved Ag were infrequently detected within the lake. Ag accumulated in the lower food web ranging from 0.27-16.82 ?g Ag mg C-1 in the bacterioplankton and 0.17-6.45 ?g Ag mg C-1 in algae (particulate fraction). Partial least squares models revealed the highest predictors of Ag accumulation were dissolved nutrients including DOC, TDN, TDP in bacterioplankton. Major predictors for particulate Ag included temperature, dissolved oxygen, and sampling date. The diversity of predictors among biological compartments emphasizes the importance of understanding the role of environmental complexity within the lower food web. Despite Ag accumulation we did not detect strong negative effects on the lake food web. An increase in particulate and bacterioplankton chlorophyll-a occurred after addition in contrast to reference lakes, which may indicate a hormetic response to low dose AgNP concentrations. Our findings provide the first whole-lake perspective regarding Ag fate and toxicity, suggesting small scale experiments may overestimate environmental responses. Keywords: Silver nanoparticles, ecotoxicity, whole-lake experiment, lower food web fate.
Author: Samir Kumar
Publisher: BoD – Books on Demand
ISBN: 1839686596
Category : Technology & Engineering
Languages : en
Pages : 268
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Book Description
This book describes the different methodologies for producing and synthesizing silver nanoparticles (AgNPs) of various shapes and sizes. It also provides an in-depth understanding of the new methods for characterizing and modifying the properties of AgNPs as well as their properties and applications in various fields. This book is a useful resource for a wide range of readers, including scientists, engineers, doctoral and postdoctoral fellows, and scientific professionals working in specialized fields such as medicine, nanotechnology, spectroscopy, analytical chemistry diagnostics, and plasmonics.
