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elevated carbon dioxide

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https://www.readbyqxmd.com/read/29426853/performance-of-the-silverman-andersen-respiratory-severity-score-in-predicting-pco-2-and-respiratory-support-in-newborns-a-prospective-cohort-study
#1
Anna Bruett Hedstrom, Nancy E Gove, Dennis E Mayock, Maneesh Batra
OBJECTIVE: To determine if the Silverman Andersen respiratory severity score, which is assessed by physical exam, within 1 h of birth is associated with elevated carbon dioxide level and/or the need for increased respiratory support. STUDY DESIGN: Prospective cohort study including 140 neonates scored within 1 h of birth. We report respiratory scores and their association with carbon dioxide and respiratory support within 24 h. RESULTS: Carbon dioxide level correlated with respiratory score (n = 33, r = 0...
February 9, 2018: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/29368508/thermal-stability-of-particle-phase-monoethanolamine-salts
#2
Xiaolong Fan, Joseph Dawson, Min-Dong Chen, Chong Qiu, Alexei Khalizov
The use of monoethanolamine (MEA, 2-hydroxyethanamine) for scrubbing of carbon dioxide from combustion flue gases may become the dominant technology for carbon capture in the near future. The widespread implementation of this technology will result in elevated emissions of MEA to the environment that may increase the loading and modify the properties of atmospheric aerosols. We have utilized experimental measurements together with aerosol microphysics calculations to derive thermodynamic properties of several MEA salts, potentially the dominant forms of MEA in atmospheric particles...
January 25, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29367072/the-effects-of-elevated-environmental-co2-on-nitrite-uptake-in-the-air-breathing-clown-knifefish-chitala-ornata
#3
Le Thi Hong Gam, Frank Bo Jensen, Do Thi Thanh Huong, Nguyen Thanh Phuong, Mark Bayley
Nitrite and carbon dioxide are common environmental contaminants in the intensive aquaculture ponds used to farm clown knifefish (Chitala ornata) in the Mekong delta, Vietnam. Here we tested the hypothesis that hypercapnia reduces nitrite uptake across the gills, because pH regulation will reduce chloride uptake and hence nitrite uptake as the two ions compete for the same transport route via the branchial HCO3-/Cl- exchanger. Fish fitted with arterial catheters were exposed to normocapnic/normoxic water (control), nitrite (1 mM), hypercapnia (21 mmHg CO2), or combined hypercapnia (acclimated hypercapnia) and nitrite for 96 h...
January 19, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/29356587/biochemical-oxidative-and-physiological-changes-caused-by-acute-exposure-of-fentanyl-and-its-3-analogs-in-rodents
#4
Shiv Kumar Yadav, Deo Kumar, Pravin Kumar, Pradeep Kumar Gupta, Rahul Bhattacharya
Synthesis and bioefficacy of fentanyl and its 8 new 1-substituted analogs (1-8) were earlier reported by us. Of these 8 compounds, N-(1-(2-phenoxyethyl)-4-piperidinyl)propionanilide (2), N-isopropyl-3-(4-( N-phenylpropionamido)piperidin-1-yl)propanamide (5), and N- t-butyl-3-(4-( N-phenylpropionamido)piperidin-1-yl) propanamide (6) were found to be more effective and less toxic compared to fentanyl. The present study reports the acute effect of fentanyl (0.50 Median Lethal Dose (LD50); intraperitoneal) and its 3 analogs (2, 5, and 6) on various biochemical and oxidative parameters in mice and various physiological parameters in rats...
January 1, 2018: International Journal of Toxicology
https://www.readbyqxmd.com/read/29334505/the-association-of-chronic-air-pollutants-with-coronary-artery-spasm-vasospastic-angina-and-endothelial-dysfunction
#5
Byoung Geol Choi, Jiwon Lee, Suhng Wook Kim, Min Woo Lee, Man Jong Baek, Yang Gi Ryu, Se Yeon Choi, Jae Kyeong Byun, Ahmed Mashaly, Yoonjee Park, Won Young Jang, Woohyeun Kim, Jah Yeon Choi, Eun Jin Park, Jin Oh Na, Cheol Ung Choi, Hong Euy Lim, Eung Ju Kim, Chang Gyu Park, Hong Seog Seo, Dong Joo Oh, Seung-Woon Rha
BACKGROUND: We evaluated the effect of chronic exposure to air pollutants (APs) on coronary endothelial function and significant coronary artery spasm (CAS) as assessed by intracoronary acetylcholine (ACH) provocation test. PATIENTS AND METHODS: A total of 6430 patients with typical or atypical chest pain who underwent intracoronary ACH provocation test were enrolled. We obtained data on APs from the Korean National Institute of Environmental Research (http://www...
January 12, 2018: Coronary Artery Disease
https://www.readbyqxmd.com/read/29330900/overexpression-of-microrna408-enhances-photosynthesis-growth-and-seed-yield-in-diverse-plants
#6
Jiawei Pan, Dahui Huang, Zhonglong Guo, Zheng Kuang, He Zhang, Xinyu Xie, Zengfeng Ma, Shaopei Gao, Manuel T Lerdau, Chengcai Chu, Lei Li
The ability of a plant to produce grain, fruit, or forage depends ultimately on photosynthesis. There have been few attempts, however, to study microRNAs, which are a class of endogenous small RNAs post-transcriptionally programming gene expression, in relation to photosynthetic traits. We focused on miR408, one of the most conserved plant miRNAs, and overexpressed it in parallel in Arabidopsis, tobacco, and rice. The transgenic plants all exhibited increased copper content in the chloroplast, elevated abundance of plastocyanin, and an induction of photosynthetic genes...
January 13, 2018: Journal of Integrative Plant Biology
https://www.readbyqxmd.com/read/29329037/phloem-function-a-key-to-understanding-and-manipulating-plant-responses-to-rising-atmospheric-co2
#7
REVIEW
Elizabeth A Ainsworth, Pauline Lemonnier
Increasing atmospheric carbon dioxide concentration ([CO2]) directly stimulates photosynthesis and reduces stomatal conductance in C3 plants. Both of these physiological effects have the potential to alter phloem function at elevated [CO2]. Recent research has clearly established that photosynthetic capacity is correlated to vascular traits associated with phloem loading and water transport, but the effects of elevated [CO2] on these relationships are largely unexplored. Plants also employ different strategies for loading sucrose and other sugars into the phloem, and there is potential for species with different phloem loading strategies to respond differently to elevated [CO2]...
January 9, 2018: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/29280410/iron-balance-and-iron-supplementation-for-the-female-athlete-a-practical-approach
#8
Charles R Pedlar, Carlo Brugnara, Georgie Bruinvels, Richard Burden
Maintaining a positive iron balance is essential for female athletes to avoid the effects of iron deficiency and anaemia and to maintain or improve performance. A major function of iron is in the production of the oxygen and carbon dioxide carrying molecule, haemoglobin, via erythropoiesis. Iron balance is under the control of a number of factors including the peptide hormone hepcidin, dietary iron intake and absorption, environmental stressors (e.g. altitude), exercise, menstrual blood loss and genetics. Menstruating females, particularly those with heavy menstrual bleeding are at an elevated risk of iron deficiency...
December 27, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29212807/the-independent-and-interactive-effects-of-incremental-heat-strain-orthostatic-stress-and-mild-hypohydration-on-cerebral-perfusion
#9
Rebekah A I Lucas, Luke C Wilson, Philip N Ainslie, Jui-Lin Fan, Kate N Thomas, James D Cotter
The purpose of this study was to identify the dose-dependent effects of heat strain and orthostasis (via lower-body negative pressure; LBNP), with and without mild hypohydration, on systemic function and cerebral perfusion. Eleven males (Mean ±SD: 27 ±7 y; body mass 77 ±6 kg), resting supine in a water-perfused suit, underwent progressive passive heating [0.5°C increments in core temperature (Tc, oesophageal to +2.0°C)] whilst euhydrated (EUH) or hypohydrated (HYPO, 1.5-2% body mass deficit). At each thermal state, mean cerebral artery blood velocity (MCAvmean, Transcranial Doppler), partial pressure of end-tidal carbon dioxide (PETCO2), heart rate (HR) and mean arterial blood pressure (MAP, photoplethysmography) were measured continuously during LBNP (0, -15, -30, -45 mm Hg)...
December 6, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29196091/minimally-invasive-percutaneous-transluminal-renal-artery-stenting
#10
Ken Kongoji, Takanobu Mitarai, Mizuho Kasahara, Hiroshi Yamazaki, Yuki Ishibashi, Kohei Koyama, Kihei Yoneyama, Yasuhiro Tanabe, Yoshihiro J Akashi, Hideaki Yoshino
BACKGROUND: Minimally invasive percutaneous transluminal renal artery stenting (MIPTRS) is a method that prevents complications to the greatest extent possible. The present study aimed to investigate the safety and efficacy of MIPTRS performed in cases of renal artery stenosis with an estimated glomerular filtration rate (eGFR)≤45mL/min. METHODS: Cases of patients who underwent MIPTRS at our hospital between December 2010 and June 2015 in whom eGFR was ≤45mL/min were retrospectively analysed...
November 21, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29190826/biological-responses-of-the-marine-diatom-chaetoceros-socialis-to-changing-environmental-conditions-a-laboratory-experiment
#11
Xuefeng Li, Nathalie Roevros, Frank Dehairs, Lei Chou
Diatoms constitute a major group of phytoplankton, accounting for ~20% of the world's primary production. It has been shown that iron (Fe) can be the limiting factor for phytoplankton growth, in particular, in the HNLC (High Nutrient Low Chlorophyll) regions. Iron plays thus an essential role in governing the marine primary productivity and the efficiency of biological carbon pump. Oceanic systems are undergoing continuous modifications at varying rates and magnitudes as a result of changing climate. The objective of our research is to evaluate how changing environmental conditions (dust deposition, ocean warming and acidification) can affect marine Fe biogeochemistry and diatom growth...
2017: PloS One
https://www.readbyqxmd.com/read/29190723/effects-of-increasing-temperature-and-co2-on-quality-of-litter-shredders-and-microorganisms-in-amazonian-aquatic-systems
#12
Renato Tavares Martins, Renan de Souza Rezende, José Francisco Gonçalves Júnior, Aline Lopes, Maria Teresa Fernandez Piedade, Heloide de Lima Cavalcante, Neusa Hamada
Climate change may affect the chemical composition of riparian leaf litter and, aquatic organisms and, consequently, leaf breakdown. We evaluated the effects of different scenarios combining increased temperature and carbon dioxide (CO2) on leaf detritus of Hevea spruceana (Benth) Müll. and decomposers (insect shredders and microorganisms). We hypothesized that simulated climate change (warming and elevated CO2) would: i) decrease leaf-litter quality, ii) decrease survival and leaf breakdown by shredders, and iii) increase microbial leaf breakdown and fungal biomass...
2017: PloS One
https://www.readbyqxmd.com/read/29178978/the-association-between-exposure-to-air-pollutants-including-pm10-pm2-5-ozone-carbon-monoxide-sulfur-dioxide-and-nitrogen-dioxide-concentration-and-the-relative-risk-of-developing-stemi-a-case-crossover-design
#13
Mohammad Ali Akbarzadeh, Isa Khaheshi, Amirsina Sharifi, Negin Yousefi, Mohammadreza Naderian, Mohammad Hasan Namazi, Morteza Safi, Hossein Vakili, Habibollah Saadat, Saeed Alipour Parsa, Negin Nickdoost
BACKGROUND: Unfavorable associations between air pollution and myocardial infarction are broadly investigated in recent studies and some of them revealed considerable associations; however, controversies exists between these investigations with regard to culprit components of air pollution and significance of correlation between myocardial infarction risk and air pollution. METHODS: The association between exposure to PM10, PM2.5, ozone, carbon monoxide, sulfur dioxide, and nitrogen dioxide concentration of background air that residents of Tehran, the capital city of Iran, which is ranked as the most air polluted city of Iran and the relative risk of developing ST-elevation myocardial infarction (STEMI) were investigated by a case-crossover design...
November 24, 2017: Environmental Research
https://www.readbyqxmd.com/read/29175086/re-examining-permissive-hypercapnia-in%C3%A2-ards-a-narrative-review
#14
REVIEW
Tavish Barnes, Vasileios Zochios, Ken Parhar
Lung-protective ventilation (LPV) has become the cornerstone of management in patients with ARDS. A subset of patients is unable to tolerate LPV without significant CO2 elevation. In these patients, permissive hypercapnia is used. Although thought to be benign, it is becoming increasingly evident that elevated CO2 levels have significant physiological effects. In this narrative review, we highlight clinically relevant end-organ effects in both animal models and clinical studies. We also explore the association between elevated CO2, acute cor pulmonale, and ICU mortality...
November 22, 2017: Chest
https://www.readbyqxmd.com/read/29167180/asymmetry-of-inverted-topology-repeats-in-the-ae1-anion-exchanger-suggests-an-elevator-like-mechanism
#15
Emel Ficici, José D Faraldo-Gómez, Michael L Jennings, Lucy R Forrest
The membrane transporter anion exchanger 1 (AE1), or band 3, is a key component in the processes of carbon-dioxide transport in the blood and urinary acidification in the renal collecting duct. In both erythrocytes and the basolateral membrane of the collecting-duct α-intercalated cells, the role of AE1 is to catalyze a one-for-one exchange of chloride for bicarbonate. After decades of biochemical and functional studies, the structure of the transmembrane region of AE1, which catalyzes the anion-exchange reaction, has finally been determined...
November 22, 2017: Journal of General Physiology
https://www.readbyqxmd.com/read/29161700/association-between-environmental-particulate-matter-and-carpal-tunnel-syndrome-in-patients-undergoing-hemodialysis
#16
Cheng-Hao Weng, Ching-Chih Hu, Tzung-Hai Yen, Wen-Hung Huang
BACKGROUND/AIMS: The deposition of β2-microglobulin induced by reactive inflammation causing carpal tunnel syndrome (CTS) is one of the complications of dialysis-related amyloidosis in maintenance hemodialysis (MHD) patients. Air pollution levels, especially particulate matter with an aerodynamic diameter of <2.5 mm (PM2.5), have significantly been associated with the elevation of systemic inflammatory markers. There is no previous research on possible associations between CTS and PM2...
November 21, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29150517/multi-omics-reveal-the-lifestyle-of-the-acidophilic-mineral-oxidizing-model-species-leptospirillum-ferriphilum-t
#17
Stephan Christel, Malte Herold, Sören Bellenberg, Mohamed El Hajjami, Antoine Buetti-Dinh, Igor V Pivkin, Wolfgang Sand, Paul Wilmes, Ansgar Poetsch, Mark Dopson
Leptospirillum ferriphilum plays a major role in acidic, metal rich environments where it represents one of the most prevalent iron oxidizers. These milieus include acid rock and mine drainage as well as biomining operations. Despite its perceived importance, no complete genome sequence of this model species' type strain is available, limiting the possibilities to investigate the strategies and adaptations Leptospirillum ferriphilum(T) applies to survive and compete in its niche. This study presents a complete, circular genome of Leptospirillum ferriphilum(T) DSM 14647 obtained by PacBio SMRT long read sequencing for use as a high quality reference...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29150502/hyperthermophilic-carbamate-kinase-stability-and-anabolic-in-vitro-activity-at-alkaline-ph
#18
James E Hennessy, Melissa J Latter, Somayeh Fazelinejad, Amy Philbrook, Daniel M Bartkus, Hye-Kyung Kim, Hideki Onagi, John G Oakeshott, Colin Scott, Apostolos Alissandratos, Christopher J Easton
Carbamate kinases catalyze the conversion of carbamate to carbamoyl phosphate, which is readily transformed into other compounds. Carbamate forms spontaneously from ammonia and carbon dioxide in aqueous solutions, so the kinases have potential for sequestrative utilization of the latter compounds. Here, we compare seven carbamate kinases from mesophilic, thermophilic and hyperthermophilic sources. In addition to the known enzymes from Enterococcus faecalis and Pyrococcus furiosus, the previously unreported enzymes from the hyperthermophiles Thermococcus sibiricus and Thermococcus barophilus, the thermophiles Fervidobacterium nodosum and Thermosipho melanesiensis, and the mesophile Clostridium tetani, were all expressed recombinantly, each in high yield...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29145459/the-construction-of-ventilation-turrets-in-atta-vollenweideri-leaf-cutting-ants-carbon-dioxide-levels-in-the-nest-tunnels-but-not-airflow-or-air-humidity-influence-turret-structure
#19
Florian Halboth, Flavio Roces
Nest ventilation in the leaf-cutting ant Atta vollenweideri is driven via a wind-induced mechanism. On their nests, workers construct small turrets that are expected to facilitate nest ventilation. We hypothesized that the construction and structural features of the turrets would depend on the colony's current demands for ventilation and thus might be influenced by the prevailing environmental conditions inside the nest. Therefore, we tested whether climate-related parameters, namely airflow, air humidity and CO2 levels in the outflowing nest air influenced turret construction in Atta vollenweideri...
2017: PloS One
https://www.readbyqxmd.com/read/29137091/the-effects-of-hypervolemic-infusion-on-microcirculation-perfusion-of-patients-during-laparoscopic-colorectal-surgery
#20
RANDOMIZED CONTROLLED TRIAL
Yunxin Deng, Qianlin Zhu, Buwei Yu, Minhua Zheng, Jue Jin
The aim of this study is to assess the effects of hypervolemic infusion with different solutions on microcirculation perfusion during laparoscopic colorectal surgery.Thirty-six patients were randomly divided into Ringer lactate solution [RL] group, succinylated gelatin injection [Gel] group, and hypertonic saline hydroxyethyl starch 40 injection [HS] group. Hypervolemic infusion was performed during the induction period of general anesthesia. Arterial blood-gas parameters, noninvasive hemodynamics, gastric tonometry values, and central venous pressure (CVP) were compared at baseline (T1); the end of hypervolemic infusion (T2); 5 min (T3), 15 min (T4), 30 min (T5), and 60 min (T6) during pneumoperitoneum; 5 min (T7), 15 min (T8), and 25 min (T9) after pneumoperitoneum...
November 2017: Medicine (Baltimore)
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