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https://www.readbyqxmd.com/read/29352676/cardiorespiratory-dynamics-of-rescuers-during-cardiopulmonary-resuscitation-in-a-hypoxic-environment
#1
Tomonobu Sato, Tomonori Takazawa, Masahiro Inoue, Yasunori Tada, Takashi Suto, Masaru Tobe, Shigeru Saito
OBJECTIVE: We had previously experienced a case involving prolonged cardiopulmonary resuscitation (CPR) on Mt. Fuji (3776 m), demanding strenuous work by the rescuers. The objective of this study was to compare the effect of compression-only and conventional CPR on oxygen saturation of rescuers in a hypoxemic environment. METHODS: Changes in percutaneous arterial oxygen saturation (SpO2) and heart rate during CPR action were measured in a hypobaric chamber with barometric pressure adjusted to be equivalent to 3700 m above sea level (630-640 hPa)...
January 8, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29346623/a-large-scale-field-study-of-bacterial-communities-in-cereal-aphid-populations-across-morocco
#2
Samir Fakhour, Jérôme Ambroise, François Renoz, Vincent Foray, Jean-Luc Gala, Thierry Hance
Insects are frequently associated with bacteria that can have significant ecological and evolutionary impacts on their hosts. To date, few studies have examined the influence of environmental factors to microbiome composition of aphids. The current work assessed the diversity of bacterial communities of five cereal aphid species (Sitobion avenae, Rhopalosiphum padi, R. maidis, Sipha maydis and Diuraphis noxia) collected across Morocco and covering a wide range of environmental conditions. We aimed to test whether symbiont combinations are host or environment specific...
January 16, 2018: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29346162/specificity-of-live-high-train-low-altitude-training-on-exercise-performance
#3
Jacob Bejder, Nikolai Baastrup Nordsborg
The novel hypothesis that "Live High-Train Low" (LHTL) does not improve sport-specific exercise performance (e.g., time trial) is discussed. Indeed, many studies demonstrate improved performance after LHTL but unfortunately control groups are often lacking, leaving open the possibility of training camp effects. Importantly, when control groups, blinding procedures and strict scientific evaluation criteria are applied, LHTL has no detectable effect on performance.
January 15, 2018: Exercise and Sport Sciences Reviews
https://www.readbyqxmd.com/read/29342280/epigenetic-differentiation-of-natural-populations-of-lilium-bosniacum-associated-with-contrasting-habitat-conditions
#4
V Zoldoš, I Biruš, E Muratovic, Z Šatovic, A Vojta, O Robin, F Pustahija, F Bogunic, V Vicic Bockor, S Siljak-Yakovlev
Epigenetic variation in natural populations with contrasting habitats might be an important element, in addition to the genetic variation, in plant adaptation to environmental stress. Here, we assessed genetic, epigenetic and cytogenetic structure of the three Lilium bosniacum populations growing on distinct habitats. One population was growing under habitual ecological conditions for this species and the other two were growing under stress associated with high altitude and serpentine soil. Amplified fragment length polymorphism (AFLP) and methylation-sensitive amplification polymorphism (MSAP) analyses revealed that the three populations did not differentiate genetically, but were clearly separated in the three distinct clusters according to DNA methylation profiles...
January 12, 2018: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29342191/changes-in-balance-and-joint-position-sense-during-a-12-day-high-altitude-trek-the-british-services-dhaulagiri-medical-research-expedition
#5
Sarah B Clarke, Kevin Deighton, Caroline Newman, Gareth Nicholson, Liam Gallagher, Christopher J Boos, Adrian Mellor, David R Woods, John P O'Hara
Postural control and joint position sense are essential for safely undertaking leisure and professional activities, particularly at high altitude. We tested whether exposure to a 12-day trek with a gradual ascent to high altitude impairs postural control and joint position sense. This was a repeated measures observational study of 12 military service personnel (28±4 years). Postural control (sway velocity measured by a portable force platform) during standing balance, a Sharpened Romberg Test and knee joint position sense were measured, in England (113m elevation) and at 3 research camps (3619m, 4600m and 5140m) on a 12-day high altitude trek in the Dhaulagiri region of Nepal...
2018: PloS One
https://www.readbyqxmd.com/read/29341860/risk-management-of-free-radicals-involved-in-air-travel-syndromes-by-antioxidants
#6
Jeum-Nam Kim, Byung-Mu Lee
Frequent air travelers and airplane pilots may develop various types of illnesses. The environmental risk factors associated with air travel syndromes (ATS) or air travel-related adverse health outcomes raised concerns and need to be assessed in the context of risk management and public health. Accordingly, the aim of the present review was to determine ATS, risk factors, and mechanisms underlying ATS using scientific data and information obtained from Medline, Toxline, and regulatory agencies. Additional information was also extracted from websites of organizations, such as the International Air Transport Association (IATA), International Association for Medical Assistance to Travelers (IAMAT), and International Civil Aviation Organization (ICAO)...
January 17, 2018: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29340578/clinical-recommendations-for-high-altitude-exposure-of-individuals-with-pre-existing-cardiovascular-conditions
#7
Gianfranco Parati, Piergiuseppe Agostoni, Buddha Basnyat, Grzegorz Bilo, Hermann Brugger, Antonio Coca, Luigi Festi, Guido Giardini, Alessandra Lironcurti, Andrew M Luks, Marco Maggiorini, Pietro A Modesti, Erik R Swenson, Bryan Williams, Peter Bärtsch, Camilla Torlasco
No abstract text is available yet for this article.
January 11, 2018: European Heart Journal
https://www.readbyqxmd.com/read/29338990/frequency-of-polycythemia-and-other-abnormalities-in-a-tibetan-herdsmen-population-residing-in-the-kham-area-of-sichuan-province-china
#8
Jian-Bo Zhang, Lin Wang, Jie Chen, Zhi-Ying Wang, Mei Cao, Shang-Mian Yie, Hua Yang, Xiao-Qin Yao, Yi Zeng, Yong-Chang Yang, Chun-Bao Xie, Tai-Qiang Zhao
INTRODUCTION: The Kham Tibetans are one of several Tibetan ethnic subgroups living in the Kham area of China. Because studies on the high-altitude adaptation of the Kham people are scant, the main aim of this study is to investigate whether the response to hypoxia, especially polycythemia status, in the Kham Tibetans is different from other Tibetan ethnic subgroups. METHODS: The primary investigation was conducted on 346 native Kham Tibetan adults (268 men and 78 women) from 3 herdsmen villages located in Hongyuan County situated at an altitude of greater than 3600 m...
January 12, 2018: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/29337873/two-novel-proline-containing-catechin-glucoside-from-water-soluble-extract-of-codonopsis-pilosula
#9
Fu-Ying Qin, Li-Zhi Cheng, Yong-Ming Yan, Bao-Hua Liu, Yong-Xian Cheng
Choushenflavonoids A (1) and B (2), two unusual proline-containing catechin glucosides, were isolated from the roots of Codonopsis pilosula cultivated in a high-altitude location of Yunnan province. Their structures were determined by spectroscopic data and chemical methods. Specifically, the absolute configuration of glucose residue in 1 and 2 was assigned by acid hydrolysis followed by derivatization and gas chromatography (GC) analysis. In addition, biological evaluation of 1 and 2 against Sirtuin 1 (SIRT1) was carried out...
January 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29335015/cryptic-diversity-in-an-atlantic-forest-malaria-vector-from-the-mountains-of-south-east-brazil
#10
Guilherme de Rezende Dias, Thais Tenorio Soares Fujii, Bernardo Fernandes Fogel, Ricardo Lourenço-de-Oliveira, Teresa Fernandes Silva-do-Nascimento, André Nóbrega Pitaluga, Carlos José Carvalho-Pinto, Antonio Bernardo Carvalho, Alexandre Afrânio Peixoto, Luísa Damazio Pitaluga Rona
BACKGROUND: Anopheles (Kerteszia) cruzii is the primary vector of human and simian malarias in Brazilian regions covered by the Atlantic Rainforest. Previous studies found that An. cruzii presents high levels of behavioural, chromosomal and molecular polymorphisms, which led to the hypothesis that it may be a complex of cryptic species. Here, An. cruzii specimens were collected in five sites in South-East Brazil located at different altitudes on the inner and coastal slopes of two mountain ranges covered by Atlantic Rainforest, known as Serra do Mar and Serra da Mantiqueria...
January 15, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29334635/the-effect-of-altitude-and-climate-on-the-suicide-rates-in-turkey
#11
Mahmut Asirdizer, Erhan Kartal, Yasin Etli, Ertugrul Tatlisumak, Orhan Gumus, Yavuz Hekimoglu, Sıddık Keskin
Suicide is one of the most important public health problems. There was an association between suicide and several factors such as psychiatric diseases and psychological characteristics, somatic illness, cultural, socioeconomic, familial, occupational and individual risk factors. Also, high altitude and climatic factors including high temperature, cloudiness, more sunshine and low rainfalls were defined as some of these risk factors in the literature. In this study, we aimed to investigate correlation between suicide rates and altitudes of all cities in Turkey and between suicide rates and climatic factors including Rainfall Activity Index, Winter Mean Temperatures, Summer Mean Temperatures and Temperature Difference between January and July previously defined by several authors in the broad series in Turkey...
January 4, 2018: Journal of Forensic and Legal Medicine
https://www.readbyqxmd.com/read/29334129/a-mitochondrial-targeted-antioxidant-improves-myofilament-ca2-sensitivity-during-prolonged-low-frequency-force-depression-at-low-po2
#12
Paulo G Gandra, Amy A Shiah, Leonardo Nogueira, Michael C Hogan
Skeletal muscle can develop a prolonged low frequency-stimulation force depression (PLFFD) following fatigue-inducing contractions. Increased levels of reactive oxygen species (ROS) have been implicated in the development of PLFFD. During exercise the skeletal muscle intracellular PO2 decreases to relatively low levels, and can be further decreased when there is an impairment in O2 diffusion or availability, such as in certain chronic diseases and during exercise at high altitude. Since ROS generation by mitochondria is elevated at very low PO2 in cells, we tested the hypothesis that treatment of muscle fibres with a mitochondrial-targeted antioxidant at a very low, near hypoxic PO2 , can attenuate PLFFD...
January 15, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29333043/picroside-i-and-picroside-ii-from-tissue-cultures-of-picrorhiza-kurroa
#13
Yamjala Ganeshkumar, Ajmera Ramarao, Ciddi Veeresham
Background: Picrorhiza kurroa (PK) belongs to Scrophulariaceae family and is a representative endemic, medicinal herb, widely distributed throughout the higher altitudes of alpine Himalayas from west to east, between 3000 and 4500 m above mean sea level. Objective: The objective of the present study is to assess the production of picroside I and picroside II from tissue cultures of PK. Materials and Methods: Auxiliary shoot tips of PK were incubated in Murashige and Skoog medium supplemented with indole-3-butyric acid and kinetin phytohormones...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29332156/enterocytozoon-bieneusi-genotypes-in-tibetan-sheep-and-yaks
#14
Qiang Zhang, Jinzhong Cai, Pei Li, Lin Wang, Yaqiong Guo, Chunhua Li, Mengtong Lei, Yaoyu Feng, Lihua Xiao
Few studies have been conducted on the distribution of Enterocytozoon bieneusi genotypes in Tibetan sheep and yaks, which live outdoors in extreme climate with high altitude. In this study, fecal specimens from 312 Tibetan sheep and 554 yaks in Qinghai, China, were collected and examined for E. bieneusi by PCR-sequence analysis of the ribosomal internal transcribed spacer. Among them, 73 (23.4%) specimens from Tibetan sheep and 40 (7.2%) from yaks were positive for E. bieneusi. There were eight E. bieneusi genotypes in Tibetan sheep, including three known ones (BEB6, COS-I, and NESH5) and five novel ones (named as CHS13-CHS17)...
January 14, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29331296/a-case-of-autosplenectomy-in-sickle-cell-trait-following-an-exposure-to-high-altitude
#15
Uday Yanamandra, Reena Das, Pankaj Malhotra, Subhash Varma
A 24-year-old man presented with acute abdominal pain upon ascent to moderate altitude (3500 m). An immediate evaluation revealed a splenic infarct, and he was evacuated to sea level. Upon recovery, he was sent back to 3500 m without detailed etiological evaluation, whereupon he experienced recurrent episodes of left-side subcostal pain. Imaging suggested autosplenectomy, and workup revealed a negative thrombophilia profile but was positive for sickle cell trait (SCT). Individuals with SCT can be asymptomatic until exposure to severe hypoxia, upon which they can manifest clinically as sickle cell syndrome...
January 10, 2018: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/29330526/relationship-among-land-surface-temperature-and-lucc-ndvi-in-typical-karst-area
#16
Yuanhong Deng, Shijie Wang, Xiaoyong Bai, Yichao Tian, Luhua Wu, Jianyong Xiao, Fei Chen, Qinghuan Qian
Land surface temperature (LST) can reflect the land surface water-heat exchange process comprehensively, which is considerably significant to the study of environmental change. However, research about LST in karst mountain areas with complex topography is scarce. Therefore, we retrieved the LST in a karst mountain area from Landsat 8 data and explored its relationships with LUCC and NDVI. The results showed that LST of the study area was noticeably affected by altitude and underlying surface type. In summer, abnormal high-temperature zones were observed in the study area, perhaps due to karst rocky desertification...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330442/competition-among-the-attentional-networks-due-to-resource-reduction-in-tibetan-indigenous-residents-evidence-from-event-related-potentials
#17
Delong Zhang, Xinjuan Zhang, Hailin Ma, Yan Wang, Huifang Ma, Ming Liu
This study used the attention network test (ANT) to evaluate the alerting, orienting, and executive network efficiencies of attention related to indigenous residents who were born and raised until early adulthood in different high-altitude areas (2900-m, 3700-m, and 4200-m) at the same location (3700-m) where these residents had been living for approximately 2 years in Tibet. We further applied the event-related potential (ERP) method to identify the underlying neurophysiological basis. Based on the ANT, we found that, in the 4200-m residents, executive function was increased but the orienting function was decreased, and the executive and orienting network scores were oppositely correlated...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29327517/sheehan-s-syndrome-the-most-common-cause-of-panhypopituitarism-at-moderate-altitude-a-sub-himalayan-study
#18
Jatinder Mokta, Asha Ranjan, Surinder Thakur, Rajesh Bhawani, Kiran K Mokta, Jai Bharat Sharma, Manish Kumar
Background: Panhypopituitarism is a rare disorder with varied clinical presentation having various etiologies. Sheehan's syndrome (SS) is decreasing in frequency worldwide and is a rare cause of panhypopituitarism in developed nations. Methodology: A retrospective study done between May 2011 and May 2015 in tertiary care hospital. We reviewed the records of patients with hypopituitarism. Clinical features, hormonal profile and radiological investigations noted. Results: Total 14 patients of panhypopituitarism included with average duration of symptoms 1...
December 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/29325987/transfer-of-pectobacterium-carotovorum-subsp-carotovorum-strains-isolated-from-potatoes-grown-at-high-altitudes-to-pectobacterium-peruviense-sp-nov
#19
Malgorzata Waleron, Agnieszka Misztak, Michal Waleron, Martyna Franczuk, Bartosz Wielgomas, Krzysztof Waleron
Seven Gram-negative, rod-shaped pectinolytic bacteria strains designated as IFB5227, IFB5228, IFB5229, IFB5230, IFB5231, IFB5232, IFB5636, isolated from potato tubers cultivated in Peru at high altitude (2400-3800m) were subjected to polyphasic analyses that revealed their distinctiveness from the other Pectobacterium species. Phylogenetic analyses based on five housekeeping genes (gyrA, recA, recN, rpoA and rpoS) clearly showed strains separateness, simultaneously indicating Pectobacterium atrosepticum, Pectobacterium wasabiae, Pectobacterium parmentieri and Pectobacterium betavasculorum as the closest relatives...
December 21, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/29321902/early-phenology-and-growth-trait-variation-in-closely-related-european-pine-species
#20
Witold Wachowiak, Annika Perry, Kevin Donnelly, Stephen Cavers
Closely related taxa occupying different environments are valuable systems for studying evolution. In this study, we examined differences in early phenology (bud set, bud burst) and early growth in a common garden trial of closely related pine species: Pinus sylvestris, P. mugo, and P. uncinata. Seeds for the trial were sourced from populations across the ranges of each species in Europe. Over first 4 years of development, clear differences were observed between species, while the most significant intraspecific differentiation was observed among plants from P...
January 2018: Ecology and Evolution
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