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https://www.readbyqxmd.com/read/27923130/plant-evo-devo-how-tip-growth-evolved
#1
Stefan A Rensing
Apical elongation of polarized plant cells (tip growth) occurs in root hairs of flowering plants and in rhizoids of bryophytes. A new report shows that the formation of these cells relies on genes already present in the first land plants.
December 5, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/27922985/video-analysis-of-anterior-cruciate-ligament-acl-injuries-a-systematic-review
#2
Victor R Carlson, Frances T Sheehan, Barry P Boden
BACKGROUND: As the most viable method for investigating in vivo anterior cruciate ligament (ACL) rupture, video analysis is critical for understanding ACL injury mechanisms and advancing preventative training programs. Despite the limited number of published studies involving video analysis, much has been gained through evaluating actual injury scenarios. METHODS: Studies meeting criteria for this systematic review were collected by performing a broad search of the ACL literature with use of variations and combinations of video recordings and ACL injuries...
November 29, 2016: JBJS Reviews
https://www.readbyqxmd.com/read/27922723/the-american-indian-and-alaska-native-dentist-workforce-in-the-united-states
#3
Elizabeth Mertz, Cynthia Wides, Paul Gates
OBJECTIVES: The purpose of this article is to describe the American Indian/Alaska Native (AI/AN) dentist workforce, the general practice patterns of these providers, and their contributions to oral health care for AI/AN and underserved patients. METHODS: A national sample survey of underrepresented minority dentists was conducted in 2012 and received a 34 percent response rate for self-reported AI/AN dentists. Data were weighted for selection and response bias to be nationally representative...
December 6, 2016: Journal of Public Health Dentistry
https://www.readbyqxmd.com/read/27922196/hiv-prevalence-and-phylogenetic-characteristics-among-entry-travelers-in-xishuangbanna-prefecture-yunnan-province-between-2003-and-2012
#4
Binghui Wang, Yaobo Liang, Yajuan Wang, Yue Feng, Yaping Li, Li Zhang, Qicai Xuan, Jing Miao, Weihong Qin, Xueshan Xia
Xishuangbanna is a popular tourist destination in southern Yunnan Province, bordering with Vietnam and Laos and Myanmar. There are more than 2 million cross-border travelers annually entering China at two land ports, Daluo and Mohan. To clarify the characteristics of HIV-1 prevalence among entry travelers, a retrospective epidemic investigation was conducted. Between 2003 and 2012, 196 among 91,432 entry travelers were detected to be HIV-1-positive, accounting for infection rate of 0.21%. Eighty-one gag-pol gene sequences were obtained for phylogenetic analyses and subsequent recombination analysis...
December 6, 2016: Journal of Medical Virology
https://www.readbyqxmd.com/read/27922014/large-differences-in-regional-precipitation-change-between-a-first-and-second-2%C3%A2-k-of-global-warming
#5
Peter Good, Ben B B Booth, Robin Chadwick, Ed Hawkins, Alexandra Jonko, Jason A Lowe
For adaptation and mitigation planning, stakeholders need reliable information about regional precipitation changes under different emissions scenarios and for different time periods. A significant amount of current planning effort assumes that each K of global warming produces roughly the same regional climate change. Here using 25 climate models, we compare precipitation responses with three 2 K intervals of global ensemble mean warming: a fast and a slower route to a first 2 K above pre-industrial levels, and the end-of-century difference between high-emission and mitigation scenarios...
December 6, 2016: Nature Communications
https://www.readbyqxmd.com/read/27922001/anthropogenic-impacts-on-mosquito-populations-in-north-america-over-the-past-century
#6
Ilia Rochlin, Ary Faraji, Dominick V Ninivaggi, Christopher M Barker, A Marm Kilpatrick
The recent emergence and spread of vector-borne viruses including Zika, chikungunya and dengue has raised concerns that climate change may cause mosquito vectors of these diseases to expand into more temperate regions. However, the long-term impact of other anthropogenic factors on mosquito abundance and distributions is less studied. Here, we show that anthropogenic chemical use (DDT; dichlorodiphenyltrichloroethane) and increasing urbanization were the strongest drivers of changes in mosquito populations over the last eight decades in areas on both coasts of North America...
December 6, 2016: Nature Communications
https://www.readbyqxmd.com/read/27921317/effects-of-economics-and-demographics-on-global-fisheries-sustainability
#7
Qi Ding, Yali Wang, Xinjun Chen, Yong Chen
A good understanding of social factors that lead to marine ecological change is important to develop sustainable global fisheries. In this study we analyzed how economic prosperity and population growth in 122 nations might ultimately affect the sustainability of their marine ecosystems during the period of 1970-2010 using a balanced panel model. We used marine Economic Exclusive Zone (EEZ) catch, mean trophic level of fishery landings (MTL), the primary production required to sustain marine catch expressed as percentage of local primary production (%PPR), and the loss in secondary production index (L index) to indicate ecological changes in marine ecosystems...
December 6, 2016: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/27920791/extending-a-single-residue-switch-for-abbreviating-catalysis-in-plant-ent-kaurene-synthases
#8
Meirong Jia, Reuben J Peters
Production of ent-kaurene as a precursor for important signaling molecules such as the gibberellins seems to have arisen early in plant evolution, with corresponding cyclase(s) present in all land plants (i.e., embryophyta). The relevant enzymes seem to represent fusion of the class II diterpene cyclase that produces the intermediate ent-copalyl diphosphate (ent-CPP) and the subsequently acting class I diterpene synthase that produces ent-kaurene, although the bifunctionality of the ancestral gene is only retained in certain early diverging plants, with gene duplication and sub-functionalization leading to distinct ent-CPP synthases and ent-kaurene synthases (KSs) generally observed...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27920382/adaptation-to-fragmentation-evolutionary-dynamics-driven-by-human-influences
#9
REVIEW
Pierre-Olivier Cheptou, Anna L Hargreaves, Dries Bonte, Hans Jacquemyn
Fragmentation-the process by which habitats are transformed into smaller patches isolated from each other-has been identified as a major threat for biodiversity. Fragmentation has well-established demographic and population genetic consequences, eroding genetic diversity and hindering gene flow among patches. However, fragmentation should also select on life history, both predictably through increased isolation, demographic stochasticity and edge effects, and more idiosyncratically via altered biotic interactions...
January 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/27919557/trend-shifts-in-satellite-derived-vegetation-growth-in-central-eurasia-1982-2013
#10
Hao-Jie Xu, Xin-Ping Wang, Tai-Bao Yang
Central Eurasian vegetation is critical for the regional ecological security and the global carbon cycle. However, climatic impacts on vegetation growth in Central Eurasia are uncertain. The reason for this uncertainty lies in the fact that the response of vegetation to climate change showed nonlinearity, seasonality and differences among plant functional types. Based on remotely sensed vegetation index and in-situ meteorological data for the years 1982-2013, in conjunction with the latest land cover type product, we analyzed how vegetation growth trend varied across different seasons and evaluated vegetation response to climate variables at regional, biome and pixel scales...
December 2, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27919541/pesticides-drive-risk-of-micropollutants-in-wastewater-impacted-streams-during-low-flow-conditions
#11
Nicole A Munz, Francis J Burdon, Dick de Zwart, Marion Junghans, Laura Melo, Marta Reyes, Urs Schönenberger, Heinz P Singer, Barbara Spycher, Juliane Hollender, Christian Stamm
Micropollutants enter surface waters through various pathways, of which wastewater treatment plants (WWTPs) are a major source. The large diversity of micropollutants and their many modes of toxic action pose a challenge for assessing environmental risks. In this study, we investigated the potential impact of WWTPs on receiving ecosystems by describing concentration patterns of micropollutants, predicting acute risks for aquatic organisms and validating these results with macroinvertebrate biomonitoring data...
November 3, 2016: Water Research
https://www.readbyqxmd.com/read/27919296/antimicrobial-resistance-in-salmonella-that-caused-foodborne-disease-outbreaks-united-states-2003-2012
#12
A C Brown, J E Grass, L C Richardson, A L Nisler, A S Bicknese, L H Gould
Although most non-typhoidal Salmonella illnesses are self-limiting, antimicrobial treatment is critical for invasive infections. To describe resistance in Salmonella that caused foodborne outbreaks in the United States, we linked outbreaks submitted to the Foodborne Disease Outbreak Surveillance System to isolate susceptibility data in the National Antimicrobial Resistance Monitoring System. Resistant outbreaks were defined as those linked to one or more isolates with resistance to at least one antimicrobial drug...
December 6, 2016: Epidemiology and Infection
https://www.readbyqxmd.com/read/27919075/land-use-intensification-causes-multitrophic-homogenization-of-grassland-communities
#13
Martin M Gossner, Thomas M Lewinsohn, Tiemo Kahl, Fabrice Grassein, Steffen Boch, Daniel Prati, Klaus Birkhofer, Swen C Renner, Johannes Sikorski, Tesfaye Wubet, Hartmut Arndt, Vanessa Baumgartner, Stefan Blaser, Nico Blüthgen, Carmen Börschig, Francois Buscot, Tim Diekötter, Leonardo Ré Jorge, Kirsten Jung, Alexander C Keyel, Alexandra-Maria Klein, Sandra Klemmer, Jochen Krauss, Markus Lange, Jörg Müller, Jörg Overmann, Esther Pašalić, Caterina Penone, David J Perović, Oliver Purschke, Peter Schall, Stephanie A Socher, Ilja Sonnemann, Marco Tschapka, Teja Tscharntke, Manfred Türke, Paul Christiaan Venter, Christiane N Weiner, Michael Werner, Volkmar Wolters, Susanne Wurst, Catrin Westphal, Markus Fischer, Wolfgang W Weisser, Eric Allan
Land-use intensification is a major driver of biodiversity loss. Alongside reductions in local species diversity, biotic homogenization at larger spatial scales is of great concern for conservation. Biotic homogenization means a decrease in β-diversity (the compositional dissimilarity between sites). Most studies have investigated losses in local (α)-diversity and neglected biodiversity loss at larger spatial scales. Studies addressing β-diversity have focused on single or a few organism groups (for example, ref...
November 30, 2016: Nature
https://www.readbyqxmd.com/read/27918941/emergence-of-plant-vascular-system-roles-of-hormonal-and-non-hormonal-regulatory-networks
#14
REVIEW
Hyunwoo Cho, Tuong Vi T Dang, Ildoo Hwang
The divergence of land plants followed by vascular plants has entirely changed the terrestrial ecology. The vascular system is a prerequisite for this evolutionary event, providing upright stature and communication for sink demand-source capacity and facilitating the development of plants and colonization over a wide range of environmental habitats. Various hormonal and non-hormonal regulatory networks have been identified and reviewed as key processes for vascular formation; however, how these factors have evolutionarily emerged and interconnected to trigger the emergence of the vascular system still remains elusive...
December 2, 2016: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/27918939/the-shady-side-of-leaf-development-the-role-of-the-revoluta-kanadi1-module-in-leaf-patterning-and-auxin-mediated-growth-promotion
#15
REVIEW
Paz Merelo, Esther Botterweg Paredes, Marcus G Heisler, Stephan Wenkel
Leaves are present in all land plants and are specialized organs for light harvesting. They arise at the flanks of the shoot apical meristem (SAM), and develop into lamina structures that exhibit adaxial/abaxial (upper/lower side of the leaf) polarity. At the molecular level, an intricate regulatory network determines ad-/abaxial polarity in Arabidopsis thaliana leaves, where the Class III Homeodomain Leucine Zipper (HD-ZIPIII) and KANADI (KAN) proteins are key mediators. The HD-ZIPIII REVOLUTA (REV) is expressed in the adaxial domain of lateral organs, whereas KAN1 is involved in abaxial differentiation...
December 2, 2016: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/27918704/comparison-of-3d-joint-angles-measured-with-the-kinect-2-0-skeletal-tracker-versus-a-marker-based-motion-capture-system
#16
Trent M Guess, Swithin Razu, Amirhossein Jahandar, Marjorie Skubic, Zhiyu Huo
The Microsoft Kinect is becoming a widely used tool for inexpensive, portable measurement of human motion with the potential to support clinical assessments of performance and function. In this study, the relative osteokinematic Cardan joint angles of the hip and knee were calculated using the Kinect 2.0 skeletal tracker. The pelvis segments of the default skeletal model were reoriented and three-dimensional joint angles were compared to a marker-based system during a drop vertical jump and a hip abduction motion...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27918689/vertical-jump-biomechanics-altered-with-virtual-overhead-goal
#17
Kevin R Ford, Anh-Dung Nguyen, Eric J Hegedus, Jeffrey B Taylor
Virtual environments with real-time feedback can simulate extrinsic goals that mimic real life conditions. The purpose was to compare jump performance and biomechanics with a physical overhead goal (POG) and with a virtual overhead goal (VOG). Fourteen female subjects participated (age: 18.8±1.1 years, height: 163.2±8.1 cm, weight 63.0±7.9 kg). Sagittal plane trunk, hip, and knee biomechanics were calculated during the landing and take-off phases of DVJ with different goal conditions. Repeated measures ANOVAs determined differences between goal conditions...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27918422/a-novel-method-for-vertical-acceleration-noise-suppression-of-a-thrust-vectored-vtol-uav
#18
Huanyu Li, Linfeng Wu, Yingjie Li, Chunwen Li, Hangyu Li
Acceleration is of great importance in motion control for unmanned aerial vehicles (UAVs), especially during the takeoff and landing stages. However, the measured acceleration is inevitably polluted by severe noise. Therefore, a proper noise suppression procedure is required. This paper presents a novel method to reduce the noise in the measured vertical acceleration for a thrust-vectored tail-sitter vertical takeoff and landing (VTOL) UAV. In the new procedure, a Kalman filter is first applied to estimate the UAV mass by using the information in the vertical thrust and measured acceleration...
December 2, 2016: Sensors
https://www.readbyqxmd.com/read/27918070/shrub-encroachment-is-linked-to-extirpation-of-an-apex-predator
#19
Christopher E Gordon, David J Eldridge, William J Ripple, Mathew S Crowther, Ben D Moore, Mike Letnic
The abundance of shrubs has increased throughout Earth's arid lands. This 'shrub encroachment' has been linked to livestock grazing, fire-suppression and elevated atmospheric CO2 concentrations facilitating shrub recruitment. Apex predators initiate trophic cascades which can influence the abundance of many species across multiple trophic levels within ecosystems. Extirpation of apex predators is linked inextricably to pastoralism, but has not been considered as a factor contributing to shrub encroachment. Here, we ask if trophic cascades triggered by the extirpation of Australia's largest terrestrial predator, the dingo (Canis dingo), could be a driver of shrub encroachment in the Strzelecki Desert, Australia...
December 5, 2016: Journal of Animal Ecology
https://www.readbyqxmd.com/read/27917987/the-future-of-pastoralism-an-introduction
#20
J Zinsstag, E Schelling, B Bonfoh, L Crump, S KrÄtli
Two-thirds of the agricultural land on planet Earth is grassland on which no other crops can be grown, either because of limited rainfall, high altitude or mountainous conditions. Most of these semi-arid and high-altitude pastoral ecosystems are used by livestock husbandry systems with various forms of mobility and are not in competition with crop production for human nutrition. By devoting an issue of its Scientific and Technical Review to pastoralism, the World Organisation for Animal Health (OIE) is encouraging debate on this important topic and helping to shape the future of pastoralists and their livestock...
November 2016: Revue Scientifique et Technique
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