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https://www.readbyqxmd.com/read/29785967/eighty-routes-to-a-ribonucleotide-world-dispersion-and-stringency-in-the-decisive-selection
#1
Michael Yarus
We examine the initial emergence of genetics; that is, of an inherited chemical capability. The crucial actors are ribonucleotides, occasionally meeting in a prebiotic landscape. Previous work identified six influential variables during such random ribonucleotide pooling. Geochemical pools can be in periodic danger (e.g., from tides) or constant danger (e.g., from unfavorable weather). Such pools receive Gaussian nucleotide amounts sporadically, at random times, or get varying substrates simultaneously. Pools use cross-templated RNA synthesis (5'-5' product from 5'-3' template) or para-templated (5'-5' product from 5'-5' template) synthesis...
May 21, 2018: RNA
https://www.readbyqxmd.com/read/29785891/performance-and-carcass-characteristics-of-steers-fed-with-two-levels-of-metabolizable-energy-intake-during-summer-and-winter-season
#2
R A Arias, J P Keim, M Gandarillas, A Velásquez, C Alvarado-Gilis, T L Mader
Climate change is producing an increase on extreme weather events around the world such as flooding, drought and extreme ambient temperatures impacting animal production and animal welfare. At present, there is a lack of studies addressing the effects of climatic conditions associated with energy intake in finishing cattle in South American feed yards. Therefore, two experiments were conducted to assess the effects of environmental variables and level of metabolizable energy intake above maintenance requirements (MEI) on performance and carcass quality of steers...
May 22, 2018: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/29783709/sensitivity-analysis-of-weather-variables-on-offsite-consequence-analysis-tools-in-south-korea-and-the-united-states
#3
Min-Uk Kim, Kyong Whan Moon, Jong-Ryeul Sohn, Sang-Hoon Byeon
We studied sensitive weather variables for consequence analysis, in the case of chemical leaks on the user side of offsite consequence analysis (OCA) tools. We used OCA tools Korea Offsite Risk Assessment (KORA) and Areal Location of Hazardous Atmospheres (ALOHA) in South Korea and the United States, respectively. The chemicals used for this analysis were 28% ammonia (NH₃), 35% hydrogen chloride (HCl), 50% hydrofluoric acid (HF), and 69% nitric acid (HNO₃). The accident scenarios were based on leakage accidents in storage tanks...
May 18, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29783231/allergenic-weed-pollen-forecast-under-the-mathematical-modeling-method-implementation-in-ukraine
#4
Irina I Motruk, Michael Yu Antomonov, Victoria V Rodinkova, Olena E Aleksandrova, Oleh V Yermishev
OBJECTIVE: Introduction: Allergies are the most common reason of the chronic diseases in developed countries and represent an important medical, social and economic issue, the relevance of which is growing both in these countries and in Ukraine. The most famous of these allergens group is the pollen of ambrosia and pollen of poaceae, which are ubiquitously distributed in the subtropical and temperate climate. The aim: The objective of our study was to develop the mathematical models, which will be able to indicate the probability of the pollen circulation, and thus these models can simplify the forecast of symptoms risk and improve the prophylaxis of pollinosis...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29782888/pm-2-5-and-ozone-indicators-of-air-quality-and-acute-deaths-in-california-2004-2007
#5
Cheng You, Dennis K J Lin, S Stanley Young
Since the London Great Smog of 1952 was estimated to have killed over 4000 people, scientists have studied the relationship between air quality and acute mortality. Currently, the association between air quality and acute deaths is usually taken as evidence for causality. As air quality has markedly improved since 1952, do contemporary datasets support this view? We use a large dataset, eight air basins in California for the years 2004-2007, to examine the possible association of ozone and PM2.5 with acute deaths after statistically removing seasonal and weather effects...
May 18, 2018: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29782305/tatami-mats-a-source-of-pitted-keratolysis-in-a-martial-arts-athlete
#6
Anamaria Balić, Zrinka Bukvić Mokos, Branka Marinović, Daniela Ledić Drvar
Dear Editor, Pitted keratolysis (PK), also known as keratosis plantaris sulcatum, is a non-inflammatory, bacterial, superficial cutaneous infection, characterized by many discrete superficial crateriform ''pits'' and erosions in the thickly keratinized skin of the weight-bearing regions of the soles of the feet (1). The disease often goes unnoticed by the patient, but when it is noticed it is because of the unbearable malodor and hyperhidrosis of the feet, which are socially unacceptable and cause great anxiety to many of the patients...
April 2018: Acta Dermatovenerologica Croatica: ADC
https://www.readbyqxmd.com/read/29782015/experimental-procedure-for-laboratory-studies-of-in-situ-burning-flammability-and-burning-efficiency-of-crude-oil
#7
Laurens van Gelderen, Grunde Jomaas
A new method for the simultaneous study of the flammability and burning efficiency of fresh and weathered crude oil through two experimental laboratory setups is presented. The experiments are easily repeatable compared to operational scale experiments (pool diameter ≥2 m), while still featuring quite realistic in situ burning conditions of crude oil on water. Experimental conditions include a flowing water sub-layer that cools the oil slick and an external heat flux (up to 50 kW/m2 ) that simulates the higher heat feedback to the fuel surface in operational scale crude oil pool fires...
May 1, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29780445/a-comparison-of-simulated-and-field-derived-leaf-area-index-lai-and-canopy-height-values-from-four-forest-complexes-in-the-southeastern-usa
#8
John S Iiames, Ellen Cooter, Donna Schwede, Jimmy Williams
Vegetative leaf area is a critical input to models that simulate human and ecosystem exposure to atmospheric pollutants. Leaf area index (LAI) can be measured in the field or numerically simulated, but all contain some inherent uncertainty that is passed to the exposure assessments that use them. LAI estimates for minimally managed or natural forest stands can be particularly difficult to develop as a result of interspecies competition, age and spatial distribution. Satellite-based LAI estimates hold promise for retrospective analyses, but we must continue to rely on numerical models for alternative management analysis...
2018: Forests
https://www.readbyqxmd.com/read/29780442/an-extended-eddy-diffusivity-mass-flux-scheme-for-unified-representation-of-subgrid-scale-turbulence-and-convection
#9
Zhihong Tan, Colleen M Kaul, Kyle G Pressel, Yair Cohen, Tapio Schneider, João Teixeira
Large-scale weather forecasting and climate models are beginning to reach horizontal resolutions of kilometers, at which common assumptions made in existing parameterization schemes of subgrid-scale turbulence and convection-such as that they adjust instantaneously to changes in resolved-scale dynamics-cease to be justifiable. Additionally, the common practice of representing boundary-layer turbulence, shallow convection, and deep convection by discontinuously different parameterizations schemes, each with its own set of parameters, has contributed to the proliferation of adjustable parameters in large-scale models...
March 2018: Journal of Advances in Modeling Earth Systems
https://www.readbyqxmd.com/read/29780287/forward-modeling-of-coronal-mass-ejection-flux-ropes-in-the-inner-heliosphere-with-3dcore
#10
C Möstl, T Amerstorfer, E Palmerio, A Isavnin, C J Farrugia, C Lowder, R M Winslow, J M Donnerer, E K J Kilpua, P D Boakes
Forecasting the geomagnetic effects of solar storms, known as coronal mass ejections (CMEs), is currently severely limited by our inability to predict the magnetic field configuration in the CME magnetic core and by observational effects of a single spacecraft trajectory through its 3-D structure. CME magnetic flux ropes can lead to continuous forcing of the energy input to the Earth's magnetosphere by strong and steady southward-pointing magnetic fields. Here we demonstrate in a proof-of-concept way a new approach to predict the southward field B z in a CME flux rope...
March 2018: Space Weather: the International Journal of Research & Applications
https://www.readbyqxmd.com/read/29780034/improving-predictive-asthma-algorithms-with-modelled-environment-data-for-scotland-an-observational-cohort-study-protocol
#11
Ireneous N Soyiri, Aziz Sheikh, Stefan Reis, Kimberly Kavanagh, Massimo Vieno, Tom Clemens, Edward J Carnell, Jiafeng Pan, Abby King, Rachel C Beck, Hester J T Ward, Chris Dibben, Chris Robertson, Colin R Simpson
INTRODUCTION: Asthma has a considerable, but potentially, avoidable burden on many populations globally. Scotland has some of the poorest health outcomes from asthma. Although ambient pollution, weather changes and sociodemographic factors have been associated with asthma attacks, it remains unclear whether modelled environment data and geospatial information can improve population-based asthma predictive algorithms. We aim to create the afferent loop of a national learning health system for asthma in Scotland...
May 20, 2018: BMJ Open
https://www.readbyqxmd.com/read/29779154/the-effect-of-meteorological-conditions-and-air-pollution-on-the-occurrence-of-type-a-and-b-acute-aortic-dissections
#12
Nan Xie, Liqun Zou, Lei Ye
To explore the association of weather conditions and air pollutants with incidence risk of acute aortic dissection (AAD), we included patients who consecutively admitted to the emergency units of our hospital for AAD between Dec. 1, 2013, and Apr. 30, 2017. Their medical records were reviewed. The meteorological data (daily precipitation, minimal and maximal temperatures, mean atmospheric pressure, relative humidity) and air pollutants values [air daily index (AQI), aerodynamic diameter of 2.5 mm or less (PM2...
May 19, 2018: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29778242/cardiovascular-responses-to-isometric-handgrip-exercise-in-young-patients-with-recurrent-vasovagal-syncope
#13
Juan Idiaquez, Juan Francisco Idiaquez, Rodrigo Iturriaga
OBJECTIVE: Arterial blood pressure (BP) increased in healthy humans in response to isometric handgrip (IHG), but the pattern of the relative contribution of cardiac output (CO) and total peripheral resistance (TPR) changes to the pressor response is different among individuals. We investigated weather patients with recurrent vasovagal syncope (VVS) have a similar pattern of individual CO, TPR and pressor responses to IHG, as healthy subjects. METHODS: 32 patients (27...
July 2018: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/29777583/predicting-phototoxicity-of-alkylated-pahs-pahs-mixtures-and-water-accommodated-fractions-of-neat-and-weathered-petroleum-with-the-phototoxic-target-lipid-model
#14
Solmaz Marzooghi, Bryson E Finch, William A Stubblefield, Dominic M Di Toro
The toxicity of petroleum can increase considerably when exposed to solar radiation. It occurs when certain components in the mixture, including polycyclic aromatic hydrocarbons (PAHs), absorb light in ultraviolet and visible portions of the solar radiation spectrum. A phototoxic target lipid model (PTLM), previously developed to predict phototoxicity of single PAHs, is validated for four species: Americamysis bahia, Rhepoxynius abronius, Daphnia magna, and Pimephales promelas exposed to 12 compounds that are components of petroleum, including alkylated PAHs and dibenzothiophene...
May 19, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29776524/analysis-of-hourly-crash-likelihood-using-unbalanced-panel-data-mixed-logit-model-and-real-time-driving-environmental-big-data
#15
Feng Chen, Suren Chen, Xiaoxiang Ma
INTRODUCTION: Driving environment, including road surface conditions and traffic states, often changes over time and influences crash probability considerably. It becomes stretched for traditional crash frequency models developed in large temporal scales to capture the time-varying characteristics of these factors, which may cause substantial loss of critical driving environmental information on crash prediction. METHOD: Crash prediction models with refined temporal data (hourly records) are developed to characterize the time-varying nature of these contributing factors...
June 2018: Journal of Safety Research
https://www.readbyqxmd.com/read/29775841/cesium-desorption-behavior-of-weathered-biotite-in-fukushima-considering-the-actual-radioactive-contamination-level-of-soils
#16
Hiroki Mukai, Kenji Tamura, Ryosuke Kikuchi, Yoshio Takahashi, Tsuyoshi Yaita, Toshihiro Kogure
For the better understanding of radioactive contamination in Fukushima Prefecture at present and in future, Cs desorption experiments have been conducted mainly using weathered biotite (WB) collected from Fukushima Prefecture and considering the actual contamination level (∼10-10  wt%) of radiocesium in Fukushima Prefecture. In the experiments, 137 Cs sorbed to WB by immersing in 137 Cs solution for one day was mostly desorbed by solutions of 1 M NaNO3 , 1 M LiNO3 , 10-1  M HCl, and 10-1  M HNO3 , although it was barely desorbed by 1 M KNO3 , 1 M CsNO3 , 1 M NH4 NO3 , and natural seawater...
May 15, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29773769/weathering-us-cuba-political-storms-jos%C3%A3-rubiera-phd-cuba-s-chief-weather-forecaster
#17
Gail Reed
Full disclosure: chief weather forecaster is not his official title, but rather one affectionally conferred on Dr Rubiera by the Cuban people, who look to him not only in times of peril, but also to learn about the science of meteorology. Anyone who has taken a taxi in Cuba during hurricane season (June 1 to November 30), and bothered to ask the driver, will receive a clear explanation about how hurricanes are formed, what the Saffir-Simpson scale is all about, and how the season is shaping up-all courtesy of Dr Rubiera's talent for communication during nightly weather forecasts and special broadcasts...
April 2018: MEDICC Review
https://www.readbyqxmd.com/read/29772512/distribution-and-speciation-of-mercury-affected-by-humic-acid-in-mariculture-sites-at-the-pearl-river-estuary
#18
Lingyun Ding, Kaiyun Zhao, Lijuan Zhang, Peng Liang, Shengchun Wu, Ming Hung Wong, Huchun Tao
At the Pearl River Estuary of southern China, mercury and its environmental problems have long been a great concern. This study investigated the distribution and speciation of mercury compounds that are significantly influenced by the increasing content of humic acid (HA, a model natural organic matter) in this region. The inorganic mercury and methyl mercury, being adsorbed and converted at different HA levels, were studied in sediments and surface water at both mariculture and their reference sites. In mariculture sediments with higher HA content (up to 4...
May 14, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29770946/using-google-earth-to-assess-shade-for-sun-protection-in-urban-recreation-spaces-methods-and-results
#19
R Gage, N Wilson, L Signal, M Barr, C Mackay, A Reeder, G Thomson
Shade in public spaces can lower the risk of and sun burning and skin cancer. However, existing methods of auditing shade require travel between sites, and sunny weather conditions. This study aimed to evaluate the feasibility of free computer software-Google Earth-for assessing shade in urban open spaces. A shade projection method was developed that uses Google Earth street view and aerial images to estimate shade at solar noon on the summer solstice, irrespective of the date of image capture. Three researchers used the method to separately estimate shade cover over pre-defined activity areas in a sample of 45 New Zealand urban open spaces, including 24 playgrounds, 12 beaches and 9 outdoor pools...
May 16, 2018: Journal of Community Health
https://www.readbyqxmd.com/read/29769655/influences-of-sedimentary-environments-and-volcanic-sources-on-diagenetic-alteration-of-volcanic-tuffs-in-south-china
#20
Nina Gong, Hanlie Hong, Warren D Huff, Qian Fang, Christopher J Bae, Chaowen Wang, Ke Yin, Shuling Chen
Permian-Triassic (P-Tr) altered volcanic ashes (tuffs) are widely distributed within the P-Tr boundary successions in South China. Volcanic altered ashes from terrestrial section-Chahe (CH) and marine section-Shangsi (SS) are selected to further understand the influence of sedimentary environments and volcanic sources on diagenetic alterarion on volcanic tuffs. The zircon 206 Pb/238 U ages of the corresponding beds between two sections are almost synchronous. Sedimentary environment of the altered tuffs was characterized by a low pH and did not experience a hydrothermal process...
May 16, 2018: Scientific Reports
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