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https://www.readbyqxmd.com/read/29776055/optimal-methylation-noise-for-best-chemotactic-performance-of-e-coli
#1
Subrata Dev, Sakuntala Chatterjee
In response to a concentration gradient of chemoattractant, E. coli bacterium modulates the rotational bias of flagellar motors which control its run-and-tumble motion, to migrate towards regions of high chemoattractant concentration. Presence of stochastic noise in the biochemical pathway of the cell has important consequences on the switching mechanism of motor bias, which in turn affects the runs and tumbles of the cell in a significant way. We model the intracellular reaction network in terms of coupled time evolution of three stochastic variables-kinase activity, methylation level, and CheY-P protein level-and study the effect of methylation noise on the chemotactic performance of the cell...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776039/autoresonant-excitation-of-bose-einstein-condensates
#2
S V Batalov, A G Shagalov, L Friedland
Controlling the state of a Bose-Einstein condensate driven by a chirped frequency perturbation in a one-dimensional anharmonic trapping potential is discussed. By identifying four characteristic time scales in this chirped-driven problem, three dimensionless parameters P_{1,2,3} are defined describing the driving strength, the anharmonicity of the trapping potential, and the strength of the particles interaction, respectively. As the driving frequency passes the linear resonance in the problem, and depending on the location in the P_{1,2,3} parameter space, the system may exhibit two very different evolutions, i...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775634/the-direction-of-protein-evolution-is-destined-by-the-stability
#3
Natsuko Ota, Ryo Kurahashi, Satoshi Sano, Kazufumi Takano
Protein evolution is potentially governed by protein stability. Here, we investigated the relationship between protein evolution and stability through the random mutational drift of a thermophilic bacterial protein, an esterase of Alicyclobacillus acidocaldarius (Aac-Est), at high and low temperatures. In the first random mutation of Aac-Est, few proteins exhibit increased activity at 65°C, indicating that the wild-type (WT) Aac-Est is located on the peak of a mountain in a fitness landscape for activity at high temperature...
May 15, 2018: Biochimie
https://www.readbyqxmd.com/read/29772452/epidemiological-aspects-of-drowning-and-non-fatal-drowning-in-the-waters-of-amsterdam
#4
G Reijnen, M van de Westeringh, M C Buster, P J E Vos, U L J Reijnders
We examined who, when, and where people non-fatally drowned of drowned in Amsterdam between January 2011 and December 2015 so that in the future more targeted and effective measures can be taken to prevent drowning. Data on non fatal drownings (N = 515, fire department database) were combined with the forensic medicine data on drowning fatalities (N=88). Who drowns in Amsterdam? The majority of those who drowned were men (82%). A high percentage of the people who drowned were under the influence of alcohol or drugs (up to 55%)...
May 8, 2018: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/29768453/spatiotemporal-characteristics-of-elderly-population-s-traffic-accidents-in-seoul-using-space-time-cube-and-space-time-kernel-density-estimation
#5
Youngok Kang, Nahye Cho, Serin Son
The purpose of this study is to analyze how the spatiotemporal characteristics of traffic accidents involving the elderly population in Seoul are changing by time period. We applied kernel density estimation and hotspot analyses to analyze the spatial characteristics of elderly people's traffic accidents, and the space-time cube, emerging hotspot, and space-time kernel density estimation analyses to analyze the spatiotemporal characteristics. In addition, we analyzed elderly people's traffic accidents by dividing cases into those in which the drivers were elderly people and those in which elderly people were victims of traffic accidents, and used the traffic accidents data in Seoul for 2013 for analysis...
2018: PloS One
https://www.readbyqxmd.com/read/29768095/test-retest-reliability-of-kinetic-variables-measured-on-campus-board-in-sport-climbers
#6
Edgardo Alvares de Campos Abreu, Sílvia Ribeiro Santos Araújo, Gustavo Henrique da Cunha Peixoto Cançado, André Gustavo Pereira de Andrade, Mauro Heleno Chagas, Hans-Joachim Karl Menzel
Sport climbers frequently use campus board (CB) to improve their upper limb strength under similar conditions of high-difficulty sport climbing routes. The objective of this study was to assess the test-retest reliability of peak force and impulse measured using a CB instrumented with two load cells on starting holds. The same evaluator examined 22 climbers on two days with 48 h between the assessments. The participants performed five concentric lunges (CL) and five lunges with stretch-shortening cycle with 1 min intervals between repetitions and 10 min between exercises...
May 16, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29764690/inter-ray-variation-in-metatarsal-strength-properties-in-humans-and-african-apes-implications-for-inferring-bipedal-biomechanics-in-the-olduvai-hominid-8-foot
#7
Biren A Patel, Tea Jashashvili, Stephanie H Bui, Kristian J Carlson, Nicole L Griffin, Ian J Wallace, Caley M Orr, Randall L Susman
When measured as a ratio of mean midshaft diameter to bone length, the OH 8 fossil hominin foot exhibits a metatarsal (Mt) robusticity pattern of 1 > 5 > 3 > 4 > 2, which differs from the widely perceived "common" modern human pattern (1 > 5 > 4 > 3 > 2); African apes generally exhibit a third pattern (1 > 2 > 3 > 4 > 5). Largely because of the relative ranking of Mt2 and Mt5, OH 8 metatarsals structurally resemble the pattern exhibited by bipedal humans more than the pattern of quadrupedal and climbing African apes...
May 12, 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29761099/mechanically-robust-and-thermally-stable-colorful-superamphiphobic-coatings
#8
Ning Tian, Penglin Zhang, Junping Zhang
Colorful super anti-wetting coatings are receiving growing attention, but are challenging to invent. Here, we report a general method for preparing mechanically robust and thermally stable colorful superamphiphobic coatings. A composite of palygorskite (PAL) nanorods and iron oxide red (IOR) was prepared by solid-state grinding or hydrothermal reaction, which was then modified by hydrolytic condensation of silanes to form a suspension. Superamphiphobic coatings were prepared by spray-coating the suspension onto substrates...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29760657/purkinje-cell-signaling-deficits-in-animal-models-of-ataxia
#9
REVIEW
Eriola Hoxha, Ilaria Balbo, Maria Concetta Miniaci, Filippo Tempia
Purkinje cell (PC) dysfunction or degeneration is the most frequent finding in animal models with ataxic symptoms. Mutations affecting intrinsic membrane properties can lead to ataxia by altering the firing rate of PCs or their firing pattern. However, the relationship between specific firing alterations and motor symptoms is not yet clear, and in some cases PC dysfunction precedes the onset of ataxic signs. Moreover, a great variety of ionic and synaptic mechanisms can affect PC signaling, resulting in different features of motor dysfunction...
2018: Frontiers in Synaptic Neuroscience
https://www.readbyqxmd.com/read/29759936/in-vitro-antioxidant-antilipoxygenase-and-antimicrobial-activities-of-extracts-from-seven-climbing-plants-belonging-to-the-bignoniaceae
#10
Carola Analía Torres, Cristina Marisel Pérez Zamora, María Beatriz Nuñez, Ana María Gonzalez
OBJECTIVES: This study aimed to evaluate the in vitro antioxidant capacity, to determine the anti-inflammatory effect due to lipoxygenase inhibition and to test the antimicrobial activity of ethanolic extracts from leaves of seven climbing species belonging to the Bignoniaceae family. These species are Adenocalymma marginatum (Cham.) DC., Amphilophium vauthieri DC., Cuspidaria convoluta (Vell.) A. H. Gentry, Dolichandra dentata (K. Schum.) L. G. Lohmann, Fridericia caudigera (S. Moore) L...
May 3, 2018: Journal of Integrative Medicine
https://www.readbyqxmd.com/read/29755837/chagasic-cardiomyopathy-and-pompe-disease-case-report
#11
Rafael Ob de Morais, Ândrea V Chaves-Markman, Anna Pp Miranda, Ingrid G Amorim, Maria da Ga de M Cavalcanti, Manuel Markman, Brivaldo Markman-Filho
BACKGROUND: Pompe disease is a lysosomal storage disease with an autosomal recessive inheritance characterized by an insufficient activity of the acid alpha-glucosidase enzyme. The incidence varies from 1:40000 to 1:200000 live births and cardiac involvement in adults is rare. Chagas disease is an infection caused by the protozoan Trypanosoma cruzi, in which one-third of the cases progress to the chronic form, and may lead to cardiac involvement, usually from the fifth decade of life onwards...
2018: American Journal of Cardiovascular Disease
https://www.readbyqxmd.com/read/29754167/an-extract-of-synedrella-nodiflora-l-gaertn-exhibits-antidepressant-properties-through-monoaminergic-mechanisms
#12
Patrick Amoateng, Kennedy Kwami Edem Kukuia, Jeffrey Amoako Mensah, Dorcas Osei-Safo, Samuel Adjei, Audrey Akyea Eklemet, Emmanuel Atsu Vinyo, Thomas K Karikari
Synedrella nodiflora (SNE) has been used traditionally for many neurological conditions and some of these neuroactive effects have been scientifically substantiated. The usefulness of SNE in depression has however not been investigated despite the availability of data in other disease models indicating it may be useful. The present study therefore examined the effect of SNE in acute murine models of depression and the possible mechanisms mediating its activities in these models. Preliminary qualitative phytochemical and high performance liquid chromatography (HPLC) screening were conducted on SNE...
May 12, 2018: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29750315/mobilization-with-movement-and-kinesio-taping-in-knee-arthritis-evaluation-and-outcomes
#13
Hülya Altmış, Deran Oskay, Bülent Elbasan, İrem Düzgün, Zeynep Tuna
INTRODUCTION: The aim of this study was to investigate the acute effects of Mulligan mobilization with movement (MwM) and taping on function and pain intensity in patients with osteoarthritis (OA). MATERIALS AND METHODS: Female patients aged between 40 and 70 years with knee OA participated in the study. The patients were divided into three groups and each group received different interventions. Group 1 received MwM and taping according to Mulligan's concept. Group 2 received MwM and placebo taping with no recovery effect and group 3 received placebo taping...
May 10, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29747909/physical-activity-and-risk-of-preterm-birth-in-a-cohort-of-african-american-women
#14
Jennifer K Straughen, Shawnita Sealy-Jefferson, Michael Bazydlo, Laura Helmkamp, Dawn P Misra
BACKGROUND: Few studies have identified modifiable risk factors that are associated with the prevention of preterm delivery (PTD). This study examined the relationship between PTD and physical activity during pregnancy. METHODS: Data were obtained by medical record review and postpartum questionnaires from a cohort of African American women (N = 1,410) delivering singleton infants. Physical activity was self-reported and analyses compared any and none. Additional analyses classified leisure time physical activity (LTPA) and walking for a purpose as 0, 1 to 19, 20 to 39, and 40 min/d or more and stair climbing as 0, 1 to 5, 6 to 9, and 10 or more times per day...
May 7, 2018: Women's Health Issues: Official Publication of the Jacobs Institute of Women's Health
https://www.readbyqxmd.com/read/29747662/progressive-mobility-program-and-technology-to-increase-the-level-of-physical-activity-and-its-benefits-in-respiratory-muscular-system-and-functionality-of-icu-patients-study-protocol-for-a-randomized-controlled-trial
#15
Debora Stripari Schujmann, Adriana Claudia Lunardi, Carolina Fu
BACKGROUND: Enhanced mobility in the Intensive Care Unit (ICU) could minimize the negative effects of critical illness, such as declines in cognitive, muscular, respiratory, and functional capacity. We aim to compare the functional status at ICU discharge of patients who underwent a progressive mobilization protocol versus patients who received conventional physiotherapy. We also examine the level of physical activity in the ICU, the degree of pulmonary and muscle function, and the length of stay to analyze correlations between these variables...
May 10, 2018: Trials
https://www.readbyqxmd.com/read/29746878/effect-of-short-bouts-of-high-intensity-activity-on-glucose-among-adults-with-prediabetes-a-pilot-randomized-crossover-study
#16
Jennifer L Gay, David M Buchner, Melissa L Erickson, Adolphia Lauture
AIM: Few data exist on the effects of vigorous-intensity activity on blood glucose. The study aim was to determine the effects of 2-min and 4-min bouts of vigorous-intensity stair climbing on glucose levels. METHODS: Nine overweight/obese adults with prediabetes (40-64 years, HbA1C 5.7%-6.4%) participated in a randomized cross-over design with three conditions on consecutive days: control; 2-min bouts of stair climbing once per hour for 8 hours; and 4-min bouts of stair climbing once every 2 hours for 8 hours, with the two activity days randomized in order...
May 7, 2018: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/29746576/graph-drawing-using-tabu-search-coupled-with-path-relinking
#17
Fadi K Dib, Peter Rodgers
Graph drawing, or the automatic layout of graphs, is a challenging problem. There are several search based methods for graph drawing which are based on optimizing an objective function which is formed from a weighted sum of multiple criteria. In this paper, we propose a new neighbourhood search method which uses a tabu search coupled with path relinking to optimize such objective functions for general graph layouts with undirected straight lines. To our knowledge, before our work, neither of these methods have been previously used in general multi-criteria graph drawing...
2018: PloS One
https://www.readbyqxmd.com/read/29745345/protective-effect-of-kaempferol-on-the-transgenic-drosophila-model-of-alzheimer-s-disease
#18
Yasir Hasan Siddique, Tanveer Beg, Smita Jyoti, Falaq Naz, X Rahul, Fahad Ali, Syed Kashif Ali, Ahmed Mohamed Reyad
BACKGROUND: Alzheimer's disease (AD) is characterized by the accumulation and deposition of β-amyloid peptides leading to a progressive neuronal damage and cell loss. Besides several hypotheses for explaining the neurodegenerative mechanisms, oxidative stress has been considered to be one of them. Till date, there is no cure for AD, but the pathogenesis of the disease could be delayed by the use of natural antioxidants. In this context, we decided to study the effect of kaempferol against the transgenic Drosophila expressing human Aβ-42...
May 8, 2018: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/29744635/shell-colour-temperature-micro-habitat-structure-and-predator-pressure-affect-the-behaviour-of-cepaea-nemoralis
#19
Zuzanna M Rosin, Zbigniew Kwieciński, Andrzej Lesicki, Piotr Skórka, Jarosław Kobak, Anna Szymańska, Tomasz S Osiejuk, Tomasz Kałuski, Monika Jaskulska, Piotr Tryjanowski
Although shell colour polymorphism of the land snail Cepaea nemoralis is a well-known phenomenon, proximate and ultimate factors driving its evolution remain uncertain. Polymorphic species show variation in behavioural responses to selective forces. Therefore, we estimated effects of various environmental factors (temperature, humidity, food availability, (micro)habitat structure and predatory pressure) on behavioural response (frequency of locomotion, climbing and hiding) of C. nemoralis morphs, in experimental and natural conditions...
May 9, 2018: Die Naturwissenschaften
https://www.readbyqxmd.com/read/29741971/impact-of-sleeping-altitude-on-symptoms-of-acute-mountain-sickness-on-mt-fuji
#20
Masahiro Horiuchi, Tadashi Uno, Junko Endo, Yoko Handa, Tatsuya Hasegawa
Horiuchi, Masahiro, Tadashi Uno, Junko Endo, Yoko Handa, and Tatsuya Hasegawa. Impact of sleeping altitude on symptoms of acute mountain sickness on Mt. Fuji. High Alt Med Biol. 00:000-000, 2018. AIMS: We sought to investigate the factors influencing acute mountain sickness (AMS) on Mt. Fuji in Japan, in particular, to assess the effects of sleeping altitude, by means of a questionnaire survey. This study involved 1932 participants who climbed Mt. Fuji, and obtained information regarding sex, age, and whether participants stayed at the mountain lodges...
May 9, 2018: High Altitude Medicine & Biology
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