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https://www.readbyqxmd.com/read/28527334/photo-protective-mechanisms-in-reed-canary-grass-to-alleviate-photo-inhibition-of-psii-on-the-qinghai-tibet-plateau
#1
Chao Zhang, Da-Wei Zhang, Yan-Ni Sun, Muhammad Arfan, Da-Xu Li, Jia-Jun Yan, Ming-Hong You, Shi-Qie Bai, Hong-Hui Lin
Due to its characteristic of high biomass yield potential, there is considerable interest in cultivating Phalaris arundinacea L. cv. 'chuancaoyin No.3' (reed canary grass) on the Qinghai-Tibet Plateau where there is an abundance of alpine steppe meadow and a potential large market for animal husbandry. In this study, we 1) investigate whether reed canary grass exhibits superior productive capacity to Elymus nutans 'Aba' (E. nutans), ordinary common pasture, during the long warm days of summer at high-altitude; and 2) compare the cold tolerance between reed canary grass and E...
May 4, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28526872/seasonal-soil-microbial-responses-are-limited-to-changes-in-functionality-at-two-alpine-forest-sites-differing-in-altitude-and-vegetation
#2
José A Siles, Rosa Margesin
The study of soil microbial responses to environmental changes is useful to improve simulation models and mitigation strategies for climate change. We here investigated two Alpine forest sites (deciduous forest vs. coniferous forest) situated at different altitudes (altitudinal effect) in spring and autumn (seasonal effect) regarding: (i) bacterial and fungal abundances (qPCR); (ii) diversity and structure of bacterial and fungal communities (amplicon sequencing); and (iii) diversity and composition of microbial functional gene community (Geochip 5...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522921/thin-air-resulting-in-high-pressure-mountain-sickness-and-hypoxia-induced-pulmonary-hypertension
#3
REVIEW
Jan Grimminger, Manuel Richter, Khodr Tello, Natascha Sommer, Henning Gall, Hossein Ardeschir Ghofrani
With rising altitude the partial pressure of oxygen falls. This phenomenon leads to hypobaric hypoxia at high altitude. Since more than 140 million people permanently live at heights above 2500 m and more than 35 million travel to these heights each year, understanding the mechanisms resulting in acute or chronic maladaptation of the human body to these circumstances is crucial. This review summarizes current knowledge of the body's acute response to these circumstances, possible complications and their treatment, and health care issues resulting from long-term exposure to high altitude...
2017: Canadian Respiratory Journal: Journal of the Canadian Thoracic Society
https://www.readbyqxmd.com/read/28522767/individual-hemoglobin-mass-response-to-normobaric-and-hypobaric-live-high-train-low-a-one-year-crossover-study
#4
Anna Hauser, Severin Troesch, Jonas J Saugy, Laurent Schmitt, Roberto Cejuela-Anta, Raphael Faiss, Thomas Steiner, Neil Robinson, Grégoire P Millet, Jon Peter Wehrlin
PURPOSE: To compare individual hemoglobin mass (Hbmass) changes following a live high-train low (LHTL) altitude training camp under either normobaric hypoxia (NH) or hypobaric hypoxia (HH) conditions in endurance athletes. METHODS: In a crossover design with a one-year washout, 15 male triathletes randomly performed two 18-d LHTL training camps in either HH or NH. All athletes slept at 2250 m and trained at altitudes < 1200 m. Hbmass was measured in duplicate with the optimized carbon monoxide rebreathing method before (pre-) and immediately after (post-) each 18 d training camp...
May 18, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28518046/epidemiologic-survey-of-japanese-encephalitis-virus-infection-tibet-china-2015
#5
Hui Zhang, Mujeeb Ur Rehman, Kun Li, Houqiang Luo, Yanfang Lan, Fazul Nabi, Lihong Zhang, Muhammad Kashif Iqbal, Suolangsi Zhu, Muhammad Tariq Javed, Yangzom Chamba, Jia Kui Li
We investigated Japanese encephalitis virus (JEV) prevalence in high-altitude regions of Tibet, China, by using standard assays to test mosquitoes, pigs, and humans. Results confirmed that JEV has spread to these areas. Disease prevention and control strategies should be used along with surveillance to limit spread of JEV in high-altitude regions of Tibet.
June 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28516029/the-power-of-vertical-geolocation-of-atmospheric-profiles-from-gnss-radio-occultation
#6
Barbara Scherllin-Pirscher, Andrea K Steiner, Gottfried Kirchengast, Marc Schwärz, Stephen S Leroy
High-resolution measurements from Global Navigation Satellite System (GNSS) radio occultation (RO) provide atmospheric profiles with independent information on altitude and pressure. This unique property is of crucial advantage when analyzing atmospheric characteristics that require joint knowledge of altitude and pressure or other thermodynamic atmospheric variables. Here we introduce and demonstrate the utility of this independent information from RO and discuss the computation, uncertainty, and use of RO atmospheric profiles on isohypsic coordinates-mean sea level altitude and geopotential height-as well as on thermodynamic coordinates (pressure and potential temperature)...
February 16, 2017: Journal of Geophysical Research. Atmospheres: JGR
https://www.readbyqxmd.com/read/28514266/pulmonary-vascular-function-and-aerobic-exercise-capacityat-moderate-altitude
#7
Vitalie Faoro, Gael Deboeck, Marco Vicenzi, Anne-Fleur Gaston, Bamodi Simaga, Grégory Doucende, Ilona Hapkova, Emma Roca, Enric Subirats, Fabienne Durand, Robert Naeije
PURPOSE: There has been suggestion that a greater "pulmonary vascular reserve" defined by a low pulmonary vascular resistance (PVR) and a high lung diffusing capacity (DL) allows for a superior aerobic exercise capacity. How pulmonary vascular reserve might affect exercise capacity at moderate altitude is not known. METHODS: Thirty-eight healthy subjects underwent an exercise stress echocardiography of the pulmonary circulation, combined with measurements of DL for nitric oxide (NO) and carbon monoxide (CO) and a cardio-pulmonary exercise test at sea level and at the altitude of 2250m...
May 17, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28512324/global-gene-expression-analysis-provides-insight-into-local-adaptation-to-geothermal-streams-in-tadpoles-of-the-andean-toad-rhinella-spinulosa
#8
Luis Pastenes, Camilo Valdivieso, Alex Di Genova, Dante Travisany, Andrew Hart, Martín Montecino, Ariel Orellana, Mauricio Gonzalez, Rodrigo A Gutiérrez, Miguel L Allende, Alejandro Maass, Marco A Méndez
The anuran Rhinella spinulosa is distributed along the Andes Range at altitudes that undergo wide daily and seasonal variation in temperature. One of the populations inhabits geothermal streams, a stable environment that influences life history traits such as the timing of metamorphosis. To investigate whether this population has undergone local adaptation to this unique habitat, we carried out transcriptome analyses in animals from two localities in two developmental stages (prometamorphic and metamorphic) and exposed them to two temperatures (20 and 25 °C)...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28509579/findings-of-cognitive-impairment-at-high-altitude-relationships-to-acetazolamide-use-and-acute-mountain-sickness
#9
Lara Phillips, Buddha Basnyat, Yuchiao Chang, Erik R Swenson, N Stuart Harris
Phillips, Lara, Buddha Basnyat, Yuchiao Chang, Erik R. Swenson, and N. Stuart Harris. Findings of cognitive impairment at high altitude: relationships to acetazolamide use and acute mountain sickness. High Alt Med Biol. 00:000-000, 2017.-Objective: Acute mountain sickness (AMS) is defined by patient-reported symptoms using the Lake Louise Score (LLS), which provides limited insight into any possible underlying central nervous system (CNS) dysfunction. Some evidence suggests AMS might coexist with altered neural functioning...
May 16, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/28507362/visual-outcome-of-retinal-vein-occlusion-in-patients-residing-at-high-altitude
#10
Ahsan Mukhtar, Muhammad Saim Khan, Asad Habib, Mazhar Ishaq, Omer Farooq
OBJECTIVE: To study visual outcome in patients of high altitude retinopathy presenting with retinal venous occlusion. METHODS: The randomised clinical trial study was conducted at the Armed Forces Institute of Ophthalmology, Rawalpindi, Pakistan, from January 2013 to December 2015, and comprised eyes of lowlanders. Patients staying at high altitude (>8,000 feet above sea level) as part of their service duty and presented with retinal venous occlusive disease were included...
May 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28506793/frequency-and-risk-factors-analysis-of-escherichia-coli-o157-h7-in-bali-cattle
#11
I Wayan Suardana, Dyah Ayu Widiasih, Widagdo Sri Nugroho, Michael Haryadi Wibowo, I Nyoman Suyasa
Cattle are known as the main reservoir of zoonotic agents verocytotoxin-producing Escherichia coli. These bacteria are usually isolated from calves with diarrhea and/or mucus and blood. Tolerance of these agents to the environmental conditions will strengthen of their transmission among livestock. A total of 238 cattle fecal samples from four sub-districts in Badung, Bali were used in this study. Epidemiological data observed include cattle age, sex, cattle rearing system, the source of drinking water, weather, altitude, and type of cage floor, the cleanliness of cage floor, the slope of cage floor, and the level of cattle cleanliness...
May 12, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28506292/normobaric-hypoxia-overnight-impairs-cognitive-reaction-time
#12
Stephan Pramsohler, Stefan Wimmer, Martin Kopp, Hannes Gatterer, Martin Faulhaber, Martin Burtscher, Nikolaus Cristoph Netzer
BACKGROUND: Impaired reaction time in patients suffering from hypoxia during sleep, caused by sleep breathing disorders, is a well-described phenomenon. High altitude sleep is known to induce periodic breathing with central apneas and oxygen desaturations, even in perfectly healthy subjects. However, deficits in reaction time in mountaineers or workers after just some nights of hypoxia exposure are not sufficiently explored. Therefore, we aimed to investigate the impact of sleep in a normobaric hypoxic environment on reaction time divided by its cognitive and motoric components...
May 15, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/28504494/staphylococcus-aureus-nasal-carriage-and-its-antibiotic-resistance-profiles-in-children-in-high-altitude-areas-of-southwestern-china
#13
Zongrong Gong, Min Shu, Qing Xia, Shan Tan, Wei Zhou, Yu Zhu, Chaomin Wan
BACKGROUND/AIM: To describe the epidemiological profile of nasal carriage of Staphylococcus aureus (S. aureus) strains, its antibiotic resistance and mecA and Panton Valentine leukocidin (PVL) genes presence, in school children residing in high altitude areas of Southwestern China. METHODS: The cross sectional study screened nasal swabs taken from students for S.aureus. PCR was performed to identify mecA and PVL genes. RESULTS: Of the total 314 children 5...
June 1, 2017: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/28501324/using-a-new-plateau-hyperbaric-chamber-to-alleviate-high-altitude-hypoxia-rabbit-and-human-studies
#14
Liang Sun, Meng-Jiang Ding, Tian-Cai Cai, Hao-Jun Fan, Hong-Mei Gao, Jian-Peng Zhang
OBJECTIVES: To validate the effects of the new plateau hyperbaric chamber on alleviating high altitude hypoxia on Mount Kun Lun. METHODS: A prospective, controlled study of rabbits and adult volunteers was conducted at altitudes of 355, 2880 and 4532m. We obtained arterial blood samples from rabbits and volunteers before and after hyperbaric treatment. The respiratory rate, heart rate, and blood pressure (BP) of adult volunteers were monitored during hyperbaric treatment...
April 19, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28500767/metformin-for-high-altitude-performance
#15
Martin Burtscher
Metformin has been introduced for treatment of type 2 diabetes but may also have ergogenic properties at high altitude by improving muscle glycogen repletion. However, very little information is available on potential risks associated with the (mis)use of metformin by healthy people. This article is protected by copyright. All rights reserved.
May 13, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28500722/uv-resistant-actinobacteria-from-high-altitude-andean-lakes-isolation-characterization-and-antagonistic-activities
#16
María Cecilia Rasuk, Gabriela Mónica Ferrer, Daniel Kurth, Luciano Raúl Portero, María Eugenia Farías, Virginia Helena Albarracín
Polyextremophiles are present in a wide variety of extreme environments in which they must overcome various hostile conditions simultaneously such as high UVB radiation, extreme pHs and temperatures, elevated salt and heavy-metal concentration, low-oxygen pressure and scarce nutrients. High-altitude Andean lakes (HAALs; between 2000 and 4000 m) are one example of these kinds of ecosystems suffering from the highest total solar and UVB radiation on Earth where an abundant and diverse polyextremophilic microbiota was reported...
May 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28500377/reliability-of-echocardiographic-speckle-tracking-derived-bi-atrial-strain-assessment-under-different-hemodynamic-conditions
#17
Mahdi Sareban, Tabea Perz, Franziska Macholz, Bernhard Reich, Peter Schmidt, Sebastian Fried, Heimo Mairbäurl, Marc M Berger, Josef Niebauer
The aim of this study was to assess intra- and inter-observer variability of left (LA) and right atrial (RA) strain indices obtained by two-dimensional speckle-tracking echocardiography (2D-STE) in a healthy group of individuals at low-altitude and after rapid ascent to high-altitude in order to provoke altered systemic and pulmonary hemodynamics otherwise seen in various cardiac diseases. Twenty healthy subjects underwent transthoracic echocardiography during a baseline examination at low-altitude (424 m) as well as 7, 20 and 44 h after arrival at high-altitude (4559 m)...
May 12, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28498991/population-differentiation-in-common-walnut-juglans-regia-l-across-major-parts-of-its-native-range-insights-from-molecular-and-morphometric-data
#18
Wladimir Roor, Heino Konrad, Davletbek Mamadjanov, Thomas Geburek
Juglans regia is an economically highly important species for fruit and wood production in the warm temperate and subtropical zones of the Northern Hemisphere. Besides the natural influence of climatic and geomorphological barriers, its genetic structure has been strongly modified by humans and the population history is still unclear. For this reason, we investigated mainly natural walnut populations across the Eurasian continent on a molecular (44 populations, 581 trees) and morphometric level (23 populations, 1391 ripe nuts)...
June 1, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28498961/range-wide-snow-leopard-phylogeography-supports-three-subspecies
#19
Jan E Janecka, Jan E Janecka, Zhang Yu-Guang, Li Di-Qiang, Bariushaa Munkhtsog, Munkhtsog Bayaraa, Naranbaatar Galsandorj, Tshewang R Wangchuk, Dibesh Karmacharya, Thomas McCarthy, Juan Li, Lu Zhi, Kubanychbek Zhumabai Uulu, Ajay Gaur, Satish Kumar, B Kesav Kumar, Shafqat Hussain, Ghulam Muhammad, Matthew Jevit, Charlotte Hacker, Pamela Burger, Claudia Wultsch, Mary J Janecka, Kristofer Helgen, William J Murphy, Rodney Jackson
The snow leopard, Panthera uncia, is an elusive high-altitude specialist that inhabits vast, inaccessible habitat across Asia. We conducted the first range-wide genetic assessment of snow leopards based on noninvasive scat surveys. Thirty-three microsatellites were genotyped and a total of 683-bp of mitochondrial DNA sequenced in 70 individuals. Snow leopards exhibited low genetic diversity at microsatellites (AN = 5.8, HO = 0.433, HE = 0.568), virtually no mtDNA variation, and underwent a bottleneck in the Holocene (~8,000 years ago) coinciding with increased temperatures, precipitation, and upward treeline shift in the Tibetan Plateau...
May 4, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/28496210/the-caterpillar-fungus-ophiocordyceps-sinensis-genome-provides-insights-into-highland-adaptation-of-fungal-pathogenicity
#20
En-Hua Xia, Da-Rong Yang, Jian-Jun Jiang, Qun-Jie Zhang, Yuan Liu, Yun-Long Liu, Yun Zhang, Hai-Bin Zhang, Cong Shi, Yan Tong, Changhoon Kim, Hua Chen, Yan-Qiong Peng, Yue Yu, Wei Zhang, Evan E Eichler, Li-Zhi Gao
To understand the potential genetic basis of highland adaptation of fungal pathogenicity, we present here the ~116 Mb de novo assembled high-quality genome of Ophiocordyceps sinensis endemic to the Qinghai-Tibetan Plateau. Compared with other plain-dwelling fungi, we find about 3.4-fold inflation of the O. sinensis genome due to a rapid amplification of long terminal repeat retrotransposons that occurred ~38 million years ago in concert with the uplift of the plateau. We also observe massive removal of thousands of genes related to the transport process and energy metabolism...
May 11, 2017: Scientific Reports
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