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https://www.readbyqxmd.com/read/29053928/heat-stress-risk-profiles-for-three-non-woven-coveralls
#1
Ximena P Garzón-Villalba, Yougui Wu, Candi D Ashley, Thomas E Bernard
The ACGIH® Threshold Limit Value® (TLV®) is used to limit heat stress exposures so that most workers can maintain thermal equilibrium. That is, the TLV was set to an upper limit of Sustainable exposures for most people. This paper addresses the ability of the TLV to differentiate between Sustainable and Unsustainable heat exposures for four clothing ensembles over a range of environmental factors and metabolic rates (M). The four clothing ensembles (woven clothing, and particle barrier, water barrier and vapor barrier coveralls) represented a wide range of evaporative resistances...
October 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29053872/resveratrol-alleviates-heat-stress-induced-impairment-of-intestinal-morphology-microflora-and-barrier-integrity-in-broilers
#2
C Zhang, X H Zhao, L Yang, X Y Chen, R S Jiang, S H Jin, Z Y Geng
This study was to investigate the effect of resveratrol on intestinal morphology, microfloras, and barrier integrity of broilers subjected to heat stress. Two-hundred-seventy 21-day-old Cobb male broilers were randomly allocated to 3 treatment groups, each of which included 6 replicates with 15 birds per replicate. The 3 treatment groups were as follows: the control group, in which birds were exposed to thermoneutral condition (22 ± 1°C), and the heat stress group and heat stress + resveratrol (400 mg/kg) group, in which birds were exposed to cyclic heat stress (33 ± 1°C for 10 h/d from 0800 to 1800 h and 22 ± 1°C for the remaining time...
October 10, 2017: Poultry Science
https://www.readbyqxmd.com/read/29053856/propolis-supplementation-attenuates-the-negative-effects-of-oxidative-stress-induced-by-paraquat-injection-on-productive-performance-and-immune-function-in-turkey-poults
#3
Ahmed O Abass, Nancy N Kamel, Walaa H Khalifa, G F Gouda, M A F El-Manylawi, Gamal M K Mehaisen, Magdi M Mashaly
Paraquat (PQ) is used as a herbicide in agriculture and causes oxidative and inflammatory damage to animal tissues. The current study was conducted to investigate the positive effects of dietary propolis (PR), as a potent naturally produced antioxidant, on growth performance and immune function of turkey poults exposed to oxidative stress induced by PQ injection. Native male turkey poults (n = 120, 49-d-old) were randomly assigned into 4 groups: poults received a basal diet with a daily subcutaneous PQ injection of 5 mg/kg BW for 7 consecutive days (PQ group), an experimental diet containing 1 g/kg PR with a daily subcutaneous PQ injection for 7 days (PR+PQ group), or received the experimental PR diet with a daily subcutaneous injection of 0...
October 5, 2017: Poultry Science
https://www.readbyqxmd.com/read/29053811/effects-of-the-supplemental-chromium-form-on-performance-and-oxidative-stress-in-broilers-exposed-to-heat-stress
#4
N Sahin, A Hayirli, C Orhan, M Tuzcu, F Akdemir, J R Komorowski, K Sahin
This experiment was conducted to investigate effects of the organic complex form of supplemental chromium (Cr) on performance, oxidative stress markers, and serum profile in broilers exposed to heat stress (HS). A total of 1,200 10-day-old boilers (Ross-308) was divided into one of the 6 treatments (2 environmental temperatures x 3 diets with different Cr forms). The birds were kept in temperature-controlled rooms at either 22 ± 2°C 24 h/d (thermoneutral, TN group) or 34 ± 2°C for 8 h/d, 08:00 to 17:00 h, followed by 22°C for 16 h (HS group) and fed either a basal diet (C) or the basal diet supplemented with Cr (200 μg/kg) through 1...
September 20, 2017: Poultry Science
https://www.readbyqxmd.com/read/29053741/the-importance-of-propolis-in-alleviating-the-negative-physiological-effects-of-heat-stress-in-quail-chicks
#5
Gamal M K Mehaisen, Rania M Ibrahim, Adel A Desoky, Hosam M Safaa, Osama A El-Sayed, Ahmed O Abass
Heat stress is one of the most detrimental confrontations in tropical and subtropical regions of the world, causing considerable economic losses in poultry production. Propolis, a resinous product of worker honeybees, possesses several biological activities that could be used to alleviate the deleterious effects of high environmental temperature on poultry production. The current study was aimed at evaluating the effects of propolis supplementation to Japanese quail (Coturnix coturnix japonica) diets on the production performance, intestinal histomorphology, relative physiological and immunological parameters, and selected gene expression under heat stress conditions...
2017: PloS One
https://www.readbyqxmd.com/read/29053587/heat-responsive-photosynthetic-and-signaling-pathways-in-plants-insight-from-proteomics
#6
REVIEW
Xiaoli Wang, Chenxi Xu, Xiaofeng Cai, Quanhua Wang, Shaojun Dai
Heat stress is a major abiotic stress posing a serious threat to plants. Heat-responsive mechanisms in plants are complicated and fine-tuned. Heat signaling transduction and photosynthesis are highly sensitive. Therefore, a thorough understanding of the molecular mechanism in heat stressed-signaling transduction and photosynthesis is necessary to protect crop yield. Current high-throughput proteomics investigations provide more useful information for underlying heat-responsive signaling pathways and photosynthesis modulation in plants...
October 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29053149/recent-expansion-of-heat-activated-retrotransposons-in-the-coral-symbiont-symbiodinium-microadriaticum
#7
Jit Ern Chen, Guoxin Cui, Xin Wang, Yi Jin Liew, Manuel Aranda
Rising sea surface temperature is the main cause of global coral reef decline. Abnormally high temperatures trigger the breakdown of the symbiotic association between corals and their photosynthetic symbionts in the genus Symbiodinium. Higher genetic variation resulting from shorter generation times has previously been proposed to provide increased adaptability to Symbiodinium compared to the host. Retrotransposition is a significant source of genetic variation in eukaryotes and some transposable elements are specifically expressed under adverse environmental conditions...
October 20, 2017: ISME Journal
https://www.readbyqxmd.com/read/29052324/effect-of-heat-stress-during-in-vitro-maturation-on-developmental-competence-of-vitrified-bovine-oocytes
#8
M Vendrell-Flotats, N Arcarons, E Barau, M López-Béjar, T Mogas
Heat-shock protein 70 (HSP70) plays a crucial role as intracellular cytoprotectant and molecular chaperone. A phenomenon of heat stress (HS) leads to production of these proteins that could be beneficial to cells during cryopreservation, which is also a stressful process for the cell. This study aimed to evaluate the protective effect of exposure of bovine oocytes to moderate HS during in vitro maturation (IVM) prior vitrification. First, oocytes were subjected to HS (41.5°C for 1 hr) at 0, 4, 8, 12 or 16 of IVM...
October 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29052319/from-pre-ovulatory-follicle-palpation-to-the-challenge-of-twin-pregnancies-clinical-reflections-following-one-million-gynaecological-examinations-in-dairy-cows
#9
REVIEW
F López-Gatius, R H F Hunter
Based on experimental studies and extensive field-scale experience, this review offers new proposals for: (i) elevating the success of modern insemination procedures, (ii) emphasizing features of a pre-ovulatory follicle in the context of optimum insemination timing, (iii) overcoming heat stress and its consequences using physiological processes or endocrine protocols, (iv) establishing a viable pregnancy or early pregnancy loss and (v) the challenge of twin pregnancies. In conclusion, the fertility of high-yielding dairy cows can be further improved...
October 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29052285/fitness-related-differences-in-the-rate-of-whole-body-evaporative-heat-loss-in-exercising-men-are-heat-load-dependent
#10
Dallon T Lamarche, Sean R Notley, Jeffrey C Louie, Martin P Poirier, Glen P Kenny
The effect of aerobic fitness (defined as rate of peak oxygen consumption) on heat loss during exercise is thought to be related to the level of heat stress. However, it remains unclear at what combined exercise and environmental (net) heat load threshold these fitness-related differences occur. To identify this, we assessed whole-body heat exchange (dry and evaporative) by direct calorimetry in young (22 ± 3 years) men matched for physical characteristics with low (Low-fit) (39.8 ± 2.5 mLO2 ·kg(-1) ·min(-1) ), moderate (Mod-fit) (50...
October 20, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29051117/melatonin-reduces-oxidative-damage-and-upregulates-heat-shock-protein-90-expression-in-cryopreserved-human-semen
#11
Shou-Long Deng, Tie-Cheng Sun, Kun Yu, Zhi-Peng Wang, Bao-Lu Zhang, Yan Zhang, Xiu-Xia Wang, Zheng-Xing Lian, Yi-Xun Liu
Sperm cells can be damaged during the semen cryopreservation process, decreasing their fertilizing ability. Physical damage and oxidative stress may occur during the freeze-thawing process. Antioxidants such as the native antioxidant melatonin can potentially improve cryopreservation outcomes. In this study, we added melatonin to cryoprotectant to examine its effect on frozen-thawed human sperm. We found that adding 0.1mM melatonin to cryoprotectant significantly increased sperm viability (24.80 ± 0.46% vs...
October 16, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29051076/behavioral-phenotype-predicts-physiological-responses-to-chronic-stress-in-proactive-and-reactive-birds
#12
Elizabeth A Pusch, Alexandra B Bentz, Daniel Becker, Kristen J Navara
Animal species display significant variation in personality traits among individuals, and two main coping styles have been identified and termed "proactive" and "reactive". Further, these coping styles appear to correlate directly with the strength of the physiological stress response exhibited by those individuals. In our study system, white laying hens are reactive, flighty, and exhibit large hormonal and behavioral responses to acute stress, while brown laying hens are proactive, exploratory, and exhibit low hormonal and behavioral responses to acute stress...
October 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29050288/the-protective-effects-of-polysaccharide-of-atractylodes-macrocephala-koidz-pamk-on-the-chicken-spleen-under-heat-stress-via-antagonizing-apoptosis-and-restoring-the-immune-function
#13
Danning Xu, Bingxin Li, Nan Cao, Wanyan Li, Yunbo Tian, Yunmao Huang
Heat stress can cause immune organ dysfunction and apoptosis. Polysaccharide of Atractylodes macrocephala Koidz may have protective effects on immune organs. In this study, we established chicken models of Polysaccharide of Atractylodes macrocephala Koidz-heat stress interaction and detected the oxidative index, activities of mitochondrial complexes and ATPases as well as the ultrastructure in chicken spleens. Expression levels of cytokines, mitochondrial dynamics- and apoptosis-related genes were also measured...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29049923/attenuation-of-heat-stress-induced-spermatogenesis-complications-by-betaine-in-mice
#14
Somayeh Shadmehr, Seyed Reza Fatemi Tabatabaei, Shima Hosseinifar, Mohammad Reza Tabandeh, Alireza Amiri
High temperatures can induce oxidative stress, impairment of spermatogenesis, and reduction of sperm quality and quantity concomitant with transient periods of partial or complete infertility in male mammals. Promising beneficial effects of betaine supplementation on the epididymal spermatozoa have been reported in experimental studies; however, its effects on testicular heat stress (HS)-induced impairment have yet to be determined. In the present study, betaine (Bet) was orally administrated (250 mg/kg day) during a 14-day period, before (Bet + HS group) or after (HS + Bet group) induction of testicular HS in 7-9 week-old male mice...
October 7, 2017: Theriogenology
https://www.readbyqxmd.com/read/29048431/hspb1-facilitates-erk-mediated-phosphorylation-and-degradation-of-bim-to-attenuate-endoplasmic-reticulum-stress-induced-apoptosis
#15
Donna Kennedy, Katarzyna Mnich, Deepu Oommen, Reka Chakravarthy, Leonardo Almeida-Souza, Michiel Krols, Svetlana Saveljeva, Karen Doyle, Sanjeev Gupta, Vincent Timmerman, Sophie Janssens, Adrienne M Gorman, Afshin Samali
BIM, a pro-apoptotic BH3-only protein, is a key regulator of the intrinsic (or mitochondrial) apoptosis pathway. Here, we show that BIM induction by endoplasmic reticulum (ER) stress is suppressed in rat PC12 cells overexpressing heat shock protein B1 (HSPB1 or HSP27) and that this is due to enhanced proteasomal degradation of BIM. HSPB1 and BIM form a complex that immunoprecipitates with p-ERK1/2. We found that HSPB1-mediated proteasomal degradation of BIM is dependent on MEK-ERK signaling. Other studies have shown that several missense mutations in HSPB1 cause the peripheral neuropathy, Charcot-Marie-Tooth (CMT) disease, which is associated with nerve degeneration...
August 31, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29048427/hdac6-inhibition-by-tubastatin-a-is-protective-against-oxidative-stress-in-a-photoreceptor-cell-line-and-restores-visual-function-in-a-zebrafish-model-of-inherited-blindness
#16
Janina Leyk, Conor Daly, Ulrike Janssen-Bienhold, Breandán N Kennedy, Christiane Richter-Landsberg
Retinal diseases, such as hereditary retinitis pigmentosa and age-related macular degeneration, are characterized by the progressive loss of photoreceptors. Histone deacetylase 6 (HDAC6) is considered as a stress surveillance factor and a potential target for neuroprotection and regeneration. Overexpression of HDAC6 has been connected to neurodegenerative disorders, and its suppression may provide protection. Here we show that HDAC6 is constitutively present in the mouse retina, and in the cone-like mouse cell line 661W...
August 31, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/29048250/inhibition-of-abeta-proteotoxicity-by-paeoniflorin-in-i-caenorhabditis-elegans-i-through-regulation-of-oxidative-and-heat-shock-stress-responses
#17
Liping Ai, Fan Yang, Jie Song, Yan Chen, Lingyun Xiao, Qiangqiang Wang, Liangyi Wang, Haifeng Li, Tao Lei, Zebo Huang
Alzheimer's disease (AD) is a common form of dementia and amyloid-β peptide (Aβ) aggregation is considered to be one of its main causes. Paeoniflorin has been previously shown to attenuate cognitive damage inflicted by exogenous Aβ protein. Using transgenic <i>Caenorhabditis elegans</i> models expressing human Aβ1-42, we demonstrate here that paeoniflorin can delay progressive paralysis caused by endogenous Aβ expression and reduce the amount of toxic Aβ oligomers in vivo although it has no effect on Aβ aggregation <i>in vitro</i>...
October 19, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/29047856/fabrication-of-asymmetric-long-period-gratings-in-polarization-maintaining-fiber-with-a-co2-laser
#18
Qingquan Wang, Yunqi Liu, Liang Zhang, Tingyun Wang
We propose the fabrication of the long-period fiber gratings (LPFGs) in a panda polarization-maintaining fiber (PMF) using a two-step CO2 laser writing method. The first laser irradiation was aligned along one of the axes of the PMF and the grating with high contrast can be written after several laser scannings. The second irradiation was performed by rotating the PMF so that the other axis of the fiber aligns toward the laser exposure. New transmission dips can be observed when the first irradiation is along the slow axis and the second one is along the fast axis of the PMF...
May 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047739/temperature-dependent-diffuse-reflectance-spectroscopy-of-plasma-sprayed-cr-doped-%C3%AE-alumina-using-supercontinuum-laser-illumination-and-co2-laser-heating
#19
Michael C Brupbacher, Dajie Zhang, William M Buchta, Marc B Airola, David M Brown, Michael E Thomas, James B Spicer
This study presents results for the high-temperature (up to 1550 K) optical properties of polycrystalline Cr-doped α-alumina materials. Diffuse reflectance spectra in the wavelength range of 510-840 nm are presented as a function of temperature to illustrate changes to the optical behavior of these materials including a previously unreported thermally activated splitting of the U-band absorption (A24→T24) in octahedrally coordinated Cr(3+). Measurements were made using a unique laser-based approach for high-temperature solid-state spectroscopy, involving front-side supercontinuum laser illumination and back-side CO2 laser heating...
September 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047263/cross-talk-between-phosphate-starvation-and-other-environmental-stress-signaling-pathways-in-plants
#20
Dongwon Baek, Hyun Jin Chun, Dae-Jin Yun, Min Chul Kim
The maintenance of inorganic phosphate (Pi) homeostasis is essential for plant growth and yield. Plants have evolved strategies to cope with Pi starvation at the transcriptional, post-transcriptional, and post-translational levels, which maximizes its availability. Many transcription factors, miRNAs, and transporters participate in the Pi starvation signaling pathway where their activities are modulated by sugar and phytohormone signaling. Environmental stresses significantly affect the uptake and utilization of nutrients by plants, but their effects on the Pi starvation response remain unclear...
October 17, 2017: Molecules and Cells
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