Now showing items 368-387 of 14421

• #### Ammonia Emissions in the United States, European Union, and China Derived by High-Resolution Inversion of Ammonium Wet Deposition Data: Interpretation with a New Agricultural Emissions Inventory (MASAGE_NH3) ﻿

(Wiley-Blackwell, 2014)
We use the adjoint of a global 3-D chemical transport model (GEOS-Chem) to optimize ammonia $(NH_3)$ emissions in the U.S., European Union, and China by inversion of 2005–2008 network data for $NH^+_4$ wet deposition ...

(2010)
• #### The Amorphous-Crystal Interface in Silicon: a Tight-Binding Simulation ﻿

(The American Physical Society, 1998)
The structural features of the interface between the cystalline and amorphous phases of Si solid are studied in simulations based on a combination of empirical interatomic potentials and a nonorthogonal tight-binding model. ...
• #### Amphiphilic Molecules and Liquid Crystals ﻿

(EDP Sciences, 1979)
A brief description of the essential features of amphiphillic molecules will be presented. This will be followed by a discussion of specific physical phenomena and their relation to a number of contemporary research areas. ...
• #### Amplification on Undirected Population Structures: Comets Beat Stars ﻿

(Springer Nature, 2017)
The fixation probability is the probability that a new mutant introduced in a homogeneous population eventually takes over the entire population. The fixation probability is a fundamental quantity of natural selection, and ...
• #### Amplifying the response of soft actuators by harnessing snap-through instabilities ﻿

(Proceedings of the National Academy of Sciences, 2015)
Although instabilities have traditionally been avoided as they often represent mechanical failure, here we embrace them to amplify the response of fluidic soft actuators. Besides presenting a robust strategy to trigger ...
• #### Amplitude and Decay Rate Analysis of Low Level Exponentially Decaying Radio-Frequency Signals ﻿

(American Institute of Physics, 1965)
A method is described which allows routine measurements of the relative amplitudes and absolute decay rates of low level exponentially decaying radio-frequency signals to be made to within an accuracy of 1%. The signals ...
• #### Amygdala Response to Facial Expressions Reflects Emotional Learning ﻿

(Society for Neuroscience, 2006)
The functional role of the human amygdala in the evaluation of emotional facial expressions is unclear. Previous animal and human research shows that the amygdala participates in processing positive and negative reinforcement ...
• #### Anaemia, prenatal iron use, and risk of adverse pregnancy outcomes: systematic review and meta-analysis ﻿

(BMJ Publishing Group Ltd., 2013)
Objectives: To summarise evidence on the associations of maternal anaemia and prenatal iron use with maternal haematological and adverse pregnancy outcomes; and to evaluate potential exposure-response relations of dose of ...
• #### Anaerobic Methane Oxidation in Metalliferous Hydrothermal Sediments: Influence on Carbon Flux and Decoupling from Sulfate Reduction ﻿

(Wiley-Blackwell, 2012)
The anaerobic oxidation of methane (AOM) is a globally significant sink that regulates methane flux from sediments into the oceans and atmosphere. Here we examine mesophilic to thermophilic AOM in hydrothermal sediments ...
• #### Anaerobic Oxidation of Short-Chain Alkanes in Hydrothermal Sediments: Potential Influences on Sulfur Cycling and Microbial Diversity ﻿

(Frontiers Research Foundation, 2013)
Short-chain alkanes play a substantial role in carbon and sulfur cycling at hydrocarbon-rich environments globally, yet few studies have examined the metabolism of ethane $(C_2)$, propane $(C_3)$, and butane $(C_4)$ ...
• #### Analog Modeling of Worm-Like Chain Molecules Using Macroscopic Beads-on-a-String ﻿

(Royal Society of Chemistry (RSC), 2012)
This paper describes an empirical model of polymer dynamics, based on the agitation of millimeter-sized polymeric beads. Although the interactions between the particles in the macroscopic model, and those between the ...
• #### Analyses Do Not Support CYP17 Genotype-Estradiol Associations--In Response ﻿

(American Association for Cancer Research, 2008)
In Response: Vitzthum and Thornburg’s comments seem to reflect a basic misunderstanding of our paper and its results. As noted in the title of the article, we document an association between CYP17 genotypes and salivary ...
• #### Analysing human neural stem cell ontogeny by consecutive isolation of Notch active neural progenitors ﻿

(Nature Pub. Group, 2015)
Decoding heterogeneity of pluripotent stem cell (PSC)-derived neural progeny is fundamental for revealing the origin of diverse progenitors, for defining their lineages, and for identifying fate determinants driving ...
• #### Analysis and interpretation of serial position data ﻿

(Informa UK Limited, 2010)
The representation of serial position in sequences is an important topic in a variety of cognitive areas including the domains of language, memory, and motor control. In the neuropsychological literature, serial position ...
• #### Analysis and Synthesis in Olfaction ﻿

(American Chemical Society, 2014)
Natural environments contain numerous volatile compounds emanating from a large number of sources, and the survival of many animals depends on their ability to segregate odors of interest within complex odorous scenes. In ...
• #### Analysis of 14 BAC Sequences from the Aedes Aegypti Genome: A Benchmark for Genome Annotation and Assembly ﻿

(BioMed Central, 2007)
In order to provide a set of manually curated and annotated sequences from the Aedes aegypti genome, mapped BAC clones encompassing 1.57 Mb were sequenced, assembled and manually annotated using computational gene-finding, ...
• #### Analysis of a Mouse Skin Model of Tuberous Sclerosis Complex ﻿

(Public Library of Science, 2016)
Tuberous Sclerosis Complex (TSC) is an autosomal dominant tumor suppressor gene syndrome in which patients develop several types of tumors, including facial angiofibroma, subungual fibroma, Shagreen patch, angiomyolipomas, ...
• #### Analysis of Abrupt Transitions in Ecological Systems ﻿

(Ecological Society of America, 2011)
The occurrence and causes of abrupt transitions, thresholds, or regime shifts between ecosystem states are of great concern and the likelihood of such transitions is increasing for many ecological systems. General understanding ...
• #### Analysis of Atmospheric Energy Transport in ERA40 and Implications for Simple Models of the Mean Tropical Circulation ﻿

(American Meterological Society, 2008)
An analysis of atmospheric energy transport in 22 years (1980-2001) of the 40-yr ECMWF Re-Analysis (ERA-40) is presented. In the analyzed budgets, there is a large cancellation between divergences of dry static and latent ...