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https://www.readbyqxmd.com/read/27914867/new-hbm-values-for-emerging-substances-inventory-of-reference-and-hbm-values-in-force-and-working-principles-of-the-german-human-biomonitoring-commission
#1
REVIEW
Petra Apel, Jürgen Angerer, Michael Wilhelm, Marike Kolossa-Gehring
The German Human Biomonitoring Commission (HBM Commission) derives health-related guidance values (Human Biomonitoring assessment values, HBM values) according to the procedures described in the HBM Commission's position papers. Since the last adaption of the methodology in 2014, the HBM Commission has established a series of new HBM values, mainly on the basis of internationally agreed TDI/RfD values, or of toxicologically well- founded points of departure observed in animal studies. The derivation of these new HBM values for HBCDD, triclosan, 2-MBT, PFOA and PFOS as well as for the metabolites of glycol ethers, of Hexamoll(®) DINCH(®), DPHP, DEHTP, NMP, NEP, and 4-MBC is specified, and the HBM values are presented together with already established HBM values for other substances...
September 17, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27872654/chlorophyll-a-fluorescence-under-half-of-the-adaptive-growth-irradiance-for-high-throughput-sensing-of-leaf-water-deficit-in-arabidopsis-thaliana-accessions
#2
Kumud B Mishra, Anamika Mishra, Kateřina Novotná, Barbora Rapantová, Petra Hodaňová, Otmar Urban, Karel Klem
BACKGROUND: Non-invasive and high-throughput monitoring of drought in plants from its initiation to visible symptoms is essential to quest drought tolerant varieties. Among the existing methods, chlorophyll a fluorescence (ChlF) imaging has the potential to probe systematic changes in photosynthetic reactions; however, prerequisite of dark-adaptation limits its use for high-throughput screening. RESULTS: To improve the throughput monitoring of plants, we have exploited their light-adaptive strategy, and investigated possibilities of measuring ChlF transients under low ambient irradiance...
2016: Plant Methods
https://www.readbyqxmd.com/read/27867393/melatonin-application-to-pisum-sativum-l-seeds-positively-influences-the-function-of-the-photosynthetic-apparatus-in-growing-seedlings-during-paraquat-induced-oxidative-stress
#3
Katarzyna Szafrańska, Russel J Reiter, Małgorzata M Posmyk
Melatonin, due to its pleiotropic effects plays an important role improving tolerance to stresses. Plants increase endogenous melatonin synthesis when faced with harsh environments as well as exogenously applied melatonin limits stress injuries. Presented work demonstrated that single melatonin application into the seeds during pre-sowing priming improved oxidative stress tolerance of growing seedlings exposed to paraquat (PQ). PQ is a powerful herbicide which blocks the process of photosynthesis under light conditions due to free radicals excess production, when O2 is rapidly converted to [Formula: see text] and subsequently to other reactive oxygen species...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27857692/endurance-training-intensity-does-not-mediate-interference-to-maximal-lower-body-strength-gain-during-short-term-concurrent-training
#4
Jackson J Fyfe, Jonathan D Bartlett, Erik D Hanson, Nigel K Stepto, David J Bishop
We determined the effect of concurrent training incorporating either high-intensity interval training (HIT) or moderate-intensity continuous training (MICT) on maximal strength, counter-movement jump (CMJ) performance, and body composition adaptations, compared with single-mode resistance training (RT). Twenty-three recreationally-active males (mean ± SD: age, 29.6 ± 5.5 y; [Formula: see text], 44 ± 11 mL kg(-1)·min(-1)) underwent 8 weeks (3 sessions·wk(-1)) of either: (1) HIT combined with RT (HIT+RT group, n = 8), (2) work-matched MICT combined with RT (MICT+RT group, n = 7), or (3) RT performed alone (RT group, n = 8)...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27834827/mercury-exposure-in-children-of-the-wanshan-mercury-mining-area-guizhou-china
#5
Buyun Du, Ping Li, Xinbin Feng, Guangle Qiu, Jun Zhou, Laurence Maurice
To evaluate the mercury (Hg) exposure level of children located in a Hg mining area, total Hg concentrations and speciation were determined in hair and urine samples of children in the Wanshan Hg mining area, Guizhou Province, China. Rice samples consumed by these same children were also collected for total mercury (THg) and methyl-mercury (MeHg) analysis. The geometric mean concentrations of THg and MeHg in the hair samples were 1.4 (range 0.50-6.0) μg/g and 1.1 (range 0.35-4.2) μg/g, respectively, while the geometric mean concentration of urine Hg (UHg) was 1...
November 8, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27833628/correlation-between-strawberry-fragaria-ananassa-duch-productivity-and-photosynthesis-related-parameters-under-various-growth-conditions
#6
Hyo G Choi, Byoung Y Moon, Nam J Kang
In the present study, we investigated changes in chlorophyll fluorescence, photosynthetic parameters and fruit yields, as well as fruit phytochemical accumulation of strawberry (Fragaria ananassa Duch.) that had been cultivated in a greenhouse under different combinations of light intensity and temperature. In plants grown with low light (LL) photosystem II chlorophyll fluorescence was found to increase as compared with those grown under high light (HL). When strawberry plants were grown with temperature higher than 5°C in addition to LL, they showed decrease in non-photochemical quenching (NPQ), photochemical quenching (qP), as well as chlorophyll fluorescence decrease ratio (RFd) when compared with other combinations of light and temperature...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27744584/resistance-training-intensity-and-volume-affect-changes-in-rate-of-force-development-in-resistance-trained-men
#7
Gerald T Mangine, Jay R Hoffman, Ran Wang, Adam M Gonzalez, Jeremy R Townsend, Adam J Wells, Adam R Jajtner, Kyle S Beyer, Carleigh H Boone, Amelia A Miramonti, Michael B LaMonica, David H Fukuda, Nicholas A Ratamess, Jeffrey R Stout
PURPOSE: To compare the effects of two different resistance training programs, high intensity (INT) and high volume (VOL), on changes in isometric force (FRC), rate of force development (RFD), and barbell velocity during dynamic strength testing. METHODS: Twenty-nine resistance-trained men were randomly assigned to either the INT (n = 15, 3-5 RM, 3-min rest interval) or VOL (n = 14, 10-12 RM, 1-min rest interval) training group for 8 weeks. All participants completed a 2-week preparatory phase prior to randomization...
October 15, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27669632/a-global-assessment-of-phthalates-burden-and-related-links-to-health-effects
#8
Ioanna Katsikantami, Stavros Sifakis, Manolis N Tzatzarakis, Elena Vakonaki, Olga-Ioanna Kalantzi, Aristidis M Tsatsakis, Apostolos K Rizos
Phthalates are ubiquitous environmental contaminants which are used in industry as plasticizers and additives in cosmetics. They are classified as Endocrine Disrupting Chemicals (EDCs) which impair the human endocrine system inducing fertility problems, respiratory diseases, childhood obesity and neuropsychological disorders. The aim of this review is to summarize the current state of knowledge on the toxicity that phthalates pose in humans based on human biomonitoring studies conducted over the last decade...
September 23, 2016: Environment International
https://www.readbyqxmd.com/read/27660301/bouncing-on-mars-and-the-moon-the-role-of-gravity-on-neuromuscular-control-correlation-of-muscle-activity-and-rate-of-force-development
#9
Ramona Ritzmann, Kathrin Freyler, Anne Krause, Albert Gollhofer
On our astronomical neighbors Mars and the Moon, bouncing movements are the preferred locomotor techniques. During bouncing, the stretch-shortening cycle describes the muscular activation pattern. This study aimed to identify gravity-dependent changes in kinematic and neuromuscular characteristics in the stretch-shortening cycle. Hence, neuromuscular control of limb muscles as well as correlations between the muscles' pre-activation, reflex components, and force output were assessed in lunar, Martian, and Earth gravity...
November 1, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27659479/effects-of-high-intensity-interval-cycling-performed-after-resistance-training-on-muscle-strength-and-hypertrophy
#10
S Tsitkanou, K Spengos, A-N Stasinaki, N Zaras, G Bogdanis, G Papadimas, G Terzis
Aim of the study was to investigate whether high-intensity interval cycling performed immediately after resistance training would inhibit muscle strength increase and hypertrophy expected from resistance training per se. Twenty-two young men were assigned into either resistance training (RE; N = 11) or resistance training plus high-intensity interval cycling (REC; N = 11). Lower body muscle strength and rate of force development (RFD), quadriceps cross-sectional area (CSA) and vastus lateralis muscle architecture, muscle fiber type composition and capillarization, and estimated aerobic capacity were evaluated before and after 8 weeks of training (2 times per week)...
September 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27650663/next-generation-testing-strategy-for-assessment-of-genomic-damage-a-conceptual-framework-and-considerations
#11
Kerry L Dearfield, B Bhaskar Gollapudi, Jeffrey C Bemis, R Daniel Benz, George R Douglas, Rosalie K Elespuru, George E Johnson, David J Kirkland, Matthew J LeBaron, Albert P Li, Francesco Marchetti, Lynn H Pottenger, Emiel Rorije, Jennifer Y Tanir, Veronique Thybaud, Jan van Benthem, Carole L Yauk, Errol Zeiger, Mirjam Luijten
For several decades, regulatory testing schemes for genetic damage have been standardized where the tests being utilized examined mutations and structural and numerical chromosomal damage. This has served the genetic toxicity community well when most of the substances being tested were amenable to such assays. The outcome from this testing is usually a dichotomous (yes/no) evaluation of test results, and in many instances, the information is only used to determine whether a substance has carcinogenic potential or not...
September 21, 2016: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/27640440/diet-induced-obesity-reduces-the-production-of-influenza-vaccine-induced-antibodies-via-impaired-macrophage-function
#12
W-J Cho, D-K Lee, S-Y Lee, S-H Sohn, H-L Park, Y-W Park, H Kim, J-H Nam
Obesity is a metabolic disease characterized by low-level chronic inflammation. Obese individuals are susceptible to infection by viruses, and vaccination against these pathogens is less effective than in nonobese individuals. Here, we sought to explore the immunological environment in a mouse model of obesity induced by a high-fat diet (HFD). HFD treatment increased the body weight and epididymal fat mass. The proportion of activated B cells, T cells, and macrophages was similar between mice in the HFD group and the regular-fat diet (RFD) group...
2016: Acta Virologica
https://www.readbyqxmd.com/read/27634487/the-influence-of-sodium-bicarbonate-on-maximal-force-and-rates-of-force-development-in-the-triceps-surae-and-brachii-during-fatiguing-exercise
#13
Jason C Siegler, Kurt Mudie, Paul Marshall
The effect of metabolic alkalosis on fibre-specific maximal force production and rates of force development (RFD) has been previously investigated in animal models, with evidence suggesting an improved capacity to rapidly develop force in fast- compared to slow-twitch muscle. We have attempted to model in vivo the fatigue profile of voluntary and involuntary maximal force and RFD in the triceps' surae and brachii after sodium bicarbonate (NaHCO3 ) ingestion. In a double-blind, 3-way repeated measures design participants (n = 10) ingested either 0...
September 16, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27626237/life-cycle-of-petroleum-biodegradation-metabolite-plumes-and-implications-for-risk-management-at-fuel-release-sites
#14
Dawn A Zemo, Kirk T O'Reilly, Rachel E Mohler, Renae I Magaw, Catalina Espino Devine, Sungwoo Ahn, Asheesh K Tiwary
This paper summarizes the results of a 5-year research study of the nature and toxicity of petroleum biodegradation metabolites in groundwater at fuel release sites that are quantified as diesel-range "Total Petroleum Hydrocarbons" (TPH; aka TPHd, DRO, etc.), unless a silica gel cleanup (SGC) step is used on the sample extract prior to the TPH analysis. This issue is important for site risk management in regulatory jurisdictions that use TPH as a metric; the presence of these metabolites may preclude site closure even if all other factors can be considered "low-risk...
September 14, 2016: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/27548797/isometric-mid-thigh-pull-reliability-and-relationship-to-deadlift-1rm
#15
John K De Witt, Kirk L English, J Brent Crowell, Kent L Kalogera, Mark E Guilliams, Bruce E Nieschwitz, Andrea M Hanson, Lori L Ploutz-Snyder
PURPOSE: The purpose of this investigation was to examine the reliability of the isometric mid-thigh pull (IMTP) and the relationship between IMTP peak force and deadlift 1 repetition maximum (1RM). METHODS: Nine subjects (5 m/4 f; 40.6 ± 8.0 yr; 1.72 ± 0.10 m; 75.6 ± 13.4 kg) participated in this study. IMTP and deadlift 1RM were both performed during 2 testing sessions. For IMTP, peak force and peak rate of force development (RFD) were determined, in addition to RFD at 30 ms, 50 ms, 90 ms, 150 ms, 200 ms, and 250 ms after initiation of the pull...
August 18, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27503040/neuromuscular-adaptations-following-90-days-bed-rest-with-or-without-resistance-exercise
#16
Björn A Alkner, Lena Norrbrand, Per A Tesch
INTRODUCTION: This study examined the effects of long-term bed rest with or without a concurrent resistance exercise protocol on different muscle function indices of the knee extensors and their influence on previously shown atrophy, neural impairment, and slow-to-fast phenotype shift. METHODS: Nine men underwent 90 d of bed rest only (BR), while eight men in addition performed maximal supine squats every third day (BRE). Before and at day 1 and 5 following bed rest, surface quadriceps electromyographic (EMG) activity was measured during a sustained (60-s) submaximal isometric action and rate of force development (RFD) was assessed during a maximal isometric action, both in the supine squat position...
July 2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/27501360/high-speed-cycling-intervention-improves-rate-dependent-mobility-in-older-adults
#17
Maria Bellumori, Mehmet Uygur, Christopher A Knight
PURPOSE: The aim was to determine the feasibility of a six-week speed-based exercise program that could be used to initiate new exercise behaviors and improve rapid movement in older adults approaching frailty. METHODS: The intervention group included 14 older adults (3 males, 11 females, mean (SD) age: 70 (7.6) years, height: 1.6 (.11) m, mass: 76.8 (12.0) kg, BMI: 27.7(4.7)). The control group included 12 older adults (6 males, 6 females, mean (SD) age: 69.2 (6...
August 6, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27497646/the-neuromotor-effects-of-transverse-friction-massage
#18
Haris Begovic, Guang-Quan Zhou, Snježana Schuster, Yong-Ping Zheng
BACKGROUND: Transverse friction massage (TFM), as an often used technique by therapists, is known for its effect in reducing the pain and loosing the scar tissues. Nevertheless, its effects on neuromotor driving mechanism including the electromechanical delay (EMD), force transmission and excitation-contraction (EC) coupling which could be used as markers of stiffness changes, has not been computed using ultrafast ultrasound (US) when combined with external sensors. AIM: Hence, the aim of this study was to find out produced neuromotor changes associated to stiffness when TFM was applied over Quadriceps femoris (QF) tendon in healthy subjcets...
July 21, 2016: Manual Therapy
https://www.readbyqxmd.com/read/27475784/scientific-foundations-of-fish-consumption-advice-for-pregnant-women-epidemiological-evidence-benefit-risk-modeling-and-an-integrated-approach
#19
Edward Groth
BACKGROUND: Pregnant women need fish consumption advice that increases seafood intake and simultaneously reduces methylmercury (MeHg) exposure. Two disciplines, epidemiology and benefit-risk modeling, can support such advice. Some current models suggest that fish consumption during pregnancy has only net beneficial effects. In contrast, many recent epidemiological studies have associated adverse effects on cognitive development with ordinary fish intake and MeHg doses routinely encountered by up to one in six US women of childbearing age...
January 2017: Environmental Research
https://www.readbyqxmd.com/read/27461346/anthony-william-english-am-rfd-bvsc-hons-phd-facvs-1943-2015
#20
B Cartmill
No abstract text is available yet for this article.
August 2016: Australian Veterinary Journal
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