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https://www.readbyqxmd.com/read/28548208/quantification-of-excitation-energy-distribution-between-photosystems-based-on-a-mechanistic-model-of-photosynthetic-electron-transport
#1
Keach Murakami, Ryo Matsuda, Kazuhiro Fujiwara
Absorbed light energy is converted into excitation energy. The excitation energy is distributed to photosystems depending on the wavelength and drives photochemical reactions. A non-destructive, mechanistic, and quantitative method for estimating the fraction of the excitation energy distributed to photosystem II (f) was developed. To estimate the f values for two simultaneously provided actinic lights (ALs) with different spectral distributions, photochemical yields of the photosystems were measured under the ALs and were then fitted to an electron transport model assuming the balance between the electron transport rates through the photosystems...
May 26, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28534877/light-enhances-the-growth-rates-of-natural-populations-of-aerobic-anoxygenic-phototrophic-bacteria
#2
Isabel Ferrera, Olga Sánchez, Eva Kolářová, Michal Koblížek, Josep M Gasol
Aerobic anoxygenic phototrophic (AAP) bacteria are microorganisms that can harvest light energy using bacteriochlorophyll a to supplement their predominantly organotrophic metabolism. Growth enhancement by light has repeatedly been demonstrated in laboratory experiments with AAP isolates. However, the ecological advantage of light utilization is unclear, as it has never been proven in the natural environment. Here, we conducted manipulation experiments in the NW Mediterranean and found that AAP bacteria display high growth rates which are controlled to a large extent by intense grazing pressure and phosphorous availability...
May 23, 2017: ISME Journal
https://www.readbyqxmd.com/read/28534027/current-concepts-and-unresolved-questions-in-dietary-protein-requirements-and-supplements-in-adults
#3
REVIEW
Stuart M Phillips
Protein needs for otherwise healthy individuals older than 19 years are defined by the recommended dietary allowance (RDA) at 0.80 g protein/kg/day. There is no recommendation in the current RDA for subpopulations of older adults or people in various pathological situations. Despite the lack of a separate recommendation, there exists a growing body of evidence that is strongly suggestive of an increased need and/or benefit for protein in older persons. That is, intakes beyond the RDA are, in older persons, associated with benefits...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/28533572/%C3%AE-lipoic-acid-mitigates-arsenic-induced-hematological-abnormalities-in-adult-male-rats
#4
Sonali Ghosh, Raghwendra Mishra, Sagnik Biswas, Rupak K Bhadra, Prabir K Mukhopadhyay
BACKGROUND: Arsenic toxicity is a major global health problem and exposure via contaminated drinking water has been associated with hematological and other systemic disorders. The present investigation has been conducted in adult male rats to evaluate the protective ability of α-lipoic acid (ALA) against such hematological disorders. METHODS: Twenty-four adult male Wister rats (b.wt.130±10g) were grouped and accordingly group I (control) received the normal diet, group II (treated) was given arsenic orally for 28 consecutive days as arsenic trioxide (3 mg/kgbw/rat/day) whereas group III (supplemented) received the same dose of arsenic along with ALA (25 mg/kgbw/rat/day) as oral supplement...
May 2017: Iranian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28533067/production-of-poly-3-hydroxybutyrate-co-3-hydroxyvalerate-under-photoautotrophy-and-heterotrophy-by-non-heterocystous-n2-fixing-cyanobacterium
#5
Keerati Taepucharoen, Somchai Tarawat, Monthira Puangcharoen, Aran Incharoensakdi, Tanakarn Monshupanee
The photoautotrophically grown cyanobacterium Oscillatoria okeni TISTR 8549 was found to produce bioplastic poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV). This PHBV production occurred under nitrogen deprivation (-N) that yielded PHBV accumulation of 14±4% (w/w DW) in which 3-hydroxyvalerate accounted for 5.5mol%. The heterotrophically grown (-N condition with acetate supplementation) cells under light showed no increase of PHBV storage, but under dark condition these cells increased PHBV accumulation to 42±8% (w/w DW) with 6...
May 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28529738/therapeutic-benefits-of-glutamine-an-umbrella-review-of-meta-analyses
#6
Marc P McRae
Glutamine may be an essential amino acid in patients with catabolic disease, as it has been demonstrated that circulating glutamine levels drop during critical illness and following major surgery; this may result in an increase in secondary infection risk, recovery time and mortality rates. However, there is much discrepancy in the literature with regards to randomized controlled studies, and therefore, the present study is an umbrella review of published meta-analyses, conducted to examine the effectiveness of glutamine's role as a therapeutic agent...
May 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28526386/the-effects-of-folic-acid-and-pyridoxine-supplementation-on-characteristics-of-migraine-attacks-in-migraine-patients-with-aura-a-double-blind-randomized-placebo-controlled-clinical-trial
#7
Gholamreza Askari, Morteza Nasiri, Hassan Mozaffari-Khosravi, Masod Rezaie, Mahdieh Bagheri-Bidakhavidi, Omid Sadeghi
OBJECTIVE: The aim of this study was to assess the effects of folic acid alone and in combination with pyridoxine on characteristics of migraine attacks in adult migraine patients with aura. METHODS: This double-blind, randomized placebo-controlled, clinical trial was conducted on 95 migraine patients with aura (age range 18-65 y) in Isfahan, Islamic Republic of Iran, in 2014. Patients were randomly allocated to receive folic acid (5 mg/d) plus pyridoxine (80 mg/d) or folic acid alone (5 mg/d) or placebo (lactose) for 3 mo...
June 2017: Nutrition
https://www.readbyqxmd.com/read/28521102/co2-delivery-to-accelerate-incisional-wound-healing-following-single-irradiation-of-near-infrared-lamp-on-the-coordinated-colloids
#8
Wei-Peng Li, Chia-Hao Su, Sheng-Jung Wang, Fu-Ju Tsai, Chun-Ting Chang, Min-Chiao Liao, Chun-Chieh Yu, Thi-Tuong Vi Tran, Chaw-Ning Lee, Wen-Tai Chiu, Tak-Wah Wong, Chen-Sheng Yeh
Traditional wound care methods include wound infection control, adequate nutritional supplements, education of changing position every 2-3 h to avoid tissue hypoxia, vacuum assistant closure, debridement, skin graft, and tissue flap. Electric current stimulation, ultrasound, laser, and hydrotherapy have emerged as adjuvant therapies. However, most, if not all, of these therapies are expensive, and the treatment results are variable. The development of the active methods to improve wound healing is mandatory...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28516845/activity-and-functional-properties-of-the-isocitrate-lyase-in-the-cyanobacterium-cyanothece-sp-pcc-7424
#9
Marianne Gründel, Henning Knoop, Ralf Steuer
Cyanobacteria are ubiquitous photoautotrophs that assimilate atmospheric CO2 as their main source of carbon. Several cyanobacteria are known to be facultative heterotrophs that are able to grow on diverse carbon sources. For selected strains, assimilation of organic acids and mixotrophic growth on acetate has been reported for decades. However, evidence for the existence of a functional glyoxylate shunt in cyanobacteria has long been contradictory and unclear. Genes coding for isocitrate lyase (ICL) and malate synthase were recently identified in two strains of the genus Cyanothece, and the existence of the complete glyoxylate shunt was verified in a strain of Chlorogloeopsis fritschii...
May 18, 2017: Microbiology
https://www.readbyqxmd.com/read/28507162/lipophagy-prevents-activity-dependent-neurodegeneration-due-to-dihydroceramide-accumulation-in-vivo
#10
Wei-Hung Jung, Chung-Chih Liu, Yu-Lian Yu, Yu-Chin Chang, Wen-Yu Lien, Hsi-Chun Chao, Shu-Yi Huang, Ching-Hua Kuo, Han-Chen Ho, Chih-Chiang Chan
Dihydroceramide desaturases are evolutionarily conserved enzymes that convert dihydroceramide (dhCer) to ceramide (Cer). While elevated Cer levels cause neurodegenerative diseases, the neuronal activity of its direct precursor, dhCer, remains unclear. We show that knockout of the fly dhCer desaturase gene, infertile crescent (ifc), results in larval lethality with increased dhCer and decreased Cer levels. Light stimulation leads to ROS increase and apoptotic cell death in ifc-KO photoreceptors, resulting in activity-dependent neurodegeneration...
May 15, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28506800/behaviour-of-silver-nanoparticles-in-simulated-saliva-and-gastrointestinal-fluids
#11
Lucie Pinďáková, Věra Kašpárková, Kristina Kejlová, Markéta Dvořáková, Daniel Krsek, Dagmar Jírová, Lucie Kašparová
Continuously increasing application of silver nanoparticles (AgNPs) requires information on their safety and performance under biological conditions. Assessment of AgNPs in biological systems is also related to availability of robust toxicological methods for evaluation of toxic potential of AgNPs and information on their physicochemical state. Silver nanoparticles were subjected to action of simulated saliva, gastric and intestinal fluids, appropriately supplemented with digestive enzymes pepsin or pancreatin...
May 12, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28503718/photodithazine-photodynamic-effect-on-viability-of-9l-lacz-gliosarcoma-cell-line
#12
Leticia C Fontana, Juliana G Pinto, André H C Pereira, Cristina P Soares, Leandro J Raniero, Juliana Ferreira-Strixino
Even with the advances of conventional treatment techniques, the nervous system cancer prognosis is still not favorable to the patient which makes alternative therapies needed to be studied. Photodynamic therapy (PDT) is presented as a promising therapy, which employs a photosensitive (PS) agent, light wavelength suitable for the PS agent, and molecular oxygen, producing reactive oxygen species in order to induce cell death. The aim of this study is to observe the PDT action in gliosarcoma cell using a chlorin (Photodithazine, PDZ)...
May 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28501994/scanning-electron-microscopy-sample-preparation-and-imaging
#13
Jenny Ngoc Tran Nguyen, Amanda M Harbison
Scanning electron microscopes allow us to reach magnifications of 20-130,000× and resolve compositional and topographical images with intense detail. These images are created by bombarding a sample with electrons in a focused manner to generate a black and white image from the electrons that bounce off of the sample. The electrons are detected using positively charged detectors. Scanning electron microscopy permits three-dimensional imaging of desiccated specimens or wet cells and tissues by using variable pressure chambers...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28500964/dietary-linseed-oil-supplemented-with-organic-selenium-improved-the-fatty-acid-nutritional-profile-muscular-selenium-deposition-water-retention-and-tenderness-of-fresh-pork
#14
Jiang Jiang, Xinyue Tang, Yan Xue, Gang Lin, Youling L Xiong
Cross-bred pigs were fed a control diet (with 0.3ppm sodium selenite and 1.5% soybean oil) or organic selenium diets (0.3ppm Se-Yeast with 1.5% soybean or linseed oil) to investigate nutrient supplement effects on meat quality and oxidative stability. The organic selenium diets increased muscular selenium content up to 54%, and linseed oil increased n-3 fatty acids two-fold while lowering the n-6/n-3 fatty acid ratio from 13.9 to 5.9 over the selenite control diet (P<0.05). Organic selenium yeast treatments with linseed oil reduced pork drip loss by 58-74% when compared with diets with soybean oil...
April 6, 2017: Meat Science
https://www.readbyqxmd.com/read/28500556/reversing-glioma-malignancy-a-new-look-at-the-role-of-antidepressant-drugs-as-adjuvant-therapy-for-glioblastoma-multiforme
#15
Anna M Bielecka-Wajdman, Marta Lesiak, Tomasz Ludyga, Aleksander Sieroń, Ewa Obuchowicz
PURPOSE: The role of glioma stem cells (GSCs) in cancer progression is currently debated; however, it is hypothesised that this subpopulation is partially responsible for therapeutic resistance observed in glioblastoma multiforme (GBM). Recent studies have shown that the current treatments not only fail to eliminate the GSC population but even promote GSCs through reprogramming of glioma non-stem cells to stem cells. Since the standard GBM treatment often requires supplementation with adjuvant drugs such as antidepressants, their role in the regulation of the heterogeneous nature of GSCs needs evaluation...
June 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/28496368/self-management-and-psychological-sexological-interventions-in-patients-with-endometriosis-strategies-outcomes-and-integration-into-clinical-care
#16
REVIEW
Laura Buggio, Giussy Barbara, Federica Facchin, Maria Pina Frattaruolo, Giorgio Aimi, Nicola Berlanda
Endometriosis has a multifactorial etiology. The onset and progression of the disease are believed to be related to different pathogenic mechanisms. Among them, the environment and lifestyle may play significant roles. Diet, dietary supplements, physical exercise, osteopathy, massage, acupuncture, transcutaneous electrical nerve stimulation, and Chinese herbal medicine may represent a complementary and feasible approach in the treatment of symptoms related to the disease. In this narrative review, we aimed to examine the most updated evidence on these alternative approaches implicated in the self-management of the disease...
2017: International Journal of Women's Health
https://www.readbyqxmd.com/read/28494164/effects-of-enhancing-vitamin-d-status-by-25-hydroxycholecalciferol-supplementation-alone-or-in-combination-with-calcium-and-phosphorus-on-sternum-mineralisation-and-breast-meat-quality-in-broilers
#17
M Bozkurt, S Yalçin, B Koçer, A E Tüzün, H Akşit, S Özkan, M Uygun, G Ege, G Güven, O Yildiz
1. The aim of the present study was to examine the effects of improving vitamin D status in broiler diets by supplementary 25OHD3, alone or in combination with calcium (Ca) and available phosphorus (aP), on live performance, sternum mineralisation and breast meat quality in broilers. 2. A total of 936 1-d-old Ross 308 broilers were used in the study. After gender determination at the hatchery, chicks from each sex were randomly distributed into three dietary treatments. The following dietary treatments were used in the experiment from d old to 38 d: 1) A control diet formulated to meet all of the nutrient requirements of broiler chicks according to the management guide; 2) The control diet supplemented with 15% 25OHD3 and 3) The control diet supplemented with 15% 25OHD3 plus Ca+aP...
May 11, 2017: British Poultry Science
https://www.readbyqxmd.com/read/28492533/gene-patents-still-alive-and-kicking-their-impact-on-provision-of-genetic-testing-for-long-qt-syndrome-in-the-canadian-public-health-care-system
#18
Sarah E Ali-Khan, E Richard Gold
PurposeAlthough the Supreme Court of the United States limited their availability in Association for Molecular Pathology v. Myriad Genetics, gene patents remain important around the world. We examine the situation in Canada, where gene patents continue to exist, in light of recent litigation relating to familial long QT syndrome (LQTS).MethodsWe conducted in-depth semistructured interviews with 25 stakeholders across five Canadian provinces and supplemented this with a case analysis of the litigation.ResultsThe majority of LQTS testing was carried out outside Canada...
May 11, 2017: Genetics in Medicine: Official Journal of the American College of Medical Genetics
https://www.readbyqxmd.com/read/28483385/acclimation-to-nacl-and-light-stress-of-heterotrophic-chlamydomonas-reinhardtii-for-lipid-accumulation
#19
Jianhua Fan, Lvhong Zheng
Salt stress has been proven very effective in enhancing the lipid content among many photoautotrophically grown microalgae species including marine and freshwater algae. Nevertheless, its effect on heterotrophic grown cells and lipid accumulation is scarcely known. This study sought to demonstrate a new train of thought for cost-effective biofuels production by heterotrophic culture of Chlamydomonas reinhardtii coupling with subsequent salt and light stress. NaCl treatments (25-200 mM) gradually suppressed the cell growth...
May 5, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28475596/long-term-rebaudioside-a-treatment-does-not-alter-circadian-activity-rhythms-adiposity-or-insulin-action-in-male-mice
#20
Thomas H Reynolds, Rachelle A Soriano, Obadi A Obadi, Stanley Murkland, Bernard Possidente
Obesity is a major public health problem that is highly associated with insulin resistance and type 2 diabetes, two conditions associated with circadian disruption. To date, dieting is one of the only interventions that result in substantial weight loss, but restricting caloric intake is difficult to maintain long-term. The use of artificial sweeteners, particularly in individuals that consume sugar sweetened beverages (energy drinks, soda), can reduce caloric intake and possibly facilitate weight loss. The purpose of the present study was to examine the effects of the artificial sweetener, rebaudioside A (Reb-A), on circadian rhythms, in vivo insulin action, and the susceptibility to diet-induced obesity...
2017: PloS One
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