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https://www.readbyqxmd.com/read/27908421/low-magnesium-diet-alters-distribution-of-macroelements-and-trace-elements-in-tissues-and-organs-of-female-rats
#1
Anastasia A Zheltova, Maria V Kharitonova, Igor N Iezhitsa, Eugeny P Serebryansky, Oleg Y Evsyukov, Alexander A Spasov, Anatoly V Skalny
The aim of the present study was to assess whether dietary magnesium deficiency can alter distribution of macroelements and trace elements in different organs and tissues. Experiments were carried out on 12 adult female Wistar rats, which were fed either a diet with low Mg content (≤20mgkg(-1) of diet) (LMgD) or a diet with daily recommended Mg content (≈500mgkg(-1)) as control group (CG) for 70 days. On the 70th day of the experiment heart, aorta, femoral skeletal muscle, forebrain, cerebellum, pituitary gland, thyroid gland, ovaries, uterus, liver, kidneys, and spleen were taken for analysis of mineral content...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27903519/dairy-intake-and-fecundability-in-2-preconception-cohort-studies
#2
Lauren A Wise, Amelia K Wesselink, Ellen M Mikkelsen, Heidi Cueto, Kristen A Hahn, Kenneth J Rothman, Katherine L Tucker, Henrik Toft Sørensen, Elizabeth E Hatch
BACKGROUND: Animal studies have shown that a high intake of galactose, a breakdown product of lactose, increases ovarian toxicity. Few epidemiologic studies, to our knowledge, have examined the association between dairy intake and fertility, and they have had conflicting findings. OBJECTIVE: We prospectively evaluated dairy intake in relation to fecundability among women who were planning for pregnancy. DESIGN: Data were derived from preconception cohort studies in Denmark (Snart Foraeldre) and North America [PRESTO (Pregnancy Study Online)] in which women completed a validated food-frequency questionnaire 10 d after enrollment...
November 30, 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27893657/status-of-serum-magnesium-in-egyptian-children-with-type-1-diabetes-and-its-correlation-to-glycemic-control-and-lipid-profile
#3
Doaa Shahbah, Amr Abo El Naga, Tamer Hassan, Marwa Zakaria, Mohamed Beshir, Salah Al Morshedy, Mohamed Abdalhady, Ezzat Kamel, Doaa Abdel Rahman, Lamiaa Kamel, May Abdelkader
Diabetes mellitus has been suggested to be the most common metabolic disorder associated with magnesium deficiency, having 25% to 39% prevalence. This deficit could be associated with the development of late diabetic complications, especially macroangiopathy.We aimed to evaluate the status of serum Mg in children with type 1 diabetes and assess its relation to glycemic control and lipid profile.We included 71 Egyptian children with type 1diabetes having their follow-up at Pediatric Endocrinology outpatient clinic, Zagazig University Hospital and 71 age- and sex-matched control...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27886540/the-effect-of-different-pyrolysis-temperatures-on-the-speciation-and-availability-in-soil-of-p-in-biochar-produced-from-the-solid-fraction-of-manure
#4
Sander Bruun, Sarah L Harmer, Georgios Bekiaris, Wibke Christel, Lucia Zuin, Yongfeng Hu, Lars Stoumann Jensen, Enzo Lombi
Biochar application to agricultural land has been proposed as a means for improving phosphorus (P) availability in soil. The purpose of the current study was to understand how pyrolysis temperature affects P speciation in biochar and how this affects availability of P in the amended soil. Biochar was produced at different temperatures from digestate solids. The primary species of P in digestate solids were simple calcium phosphates. However, a high co-occurrence of magnesium (Mg) and P, indicated that struvite or other magnesium phosphates may also be important species...
November 22, 2016: Chemosphere
https://www.readbyqxmd.com/read/27882224/correlation-between-serum-parathyroid-hormone-levels-and-coronary-artery-calcification-in-patients-without-renal-failure
#5
Gang-Yong Wu, Bai-Da Xu, Ting Wu, Xiao-Ying Wang, Tian-Xiao Wang, Xiao Zhang, Xiao Wang, Yang Xia, Gang-Jun Zong
The aim of the present study was to investigate the correlation between serum parathyroid hormone (PTH) levels and coronary artery calcification (CAC) in patients without renal failure, as well as to determine independent risk factors of CAC score (CACS). A total of 157 patients who underwent coronary computed tomography angiographic examination at the 101th Hospital of the People's Liberation Army between December 2013 and February 2015 were retrospectively evaluated. The correlation between PTH levels and CACS was determined using a Pearson correlation analysis...
November 2016: Biomedical Reports
https://www.readbyqxmd.com/read/27869102/novel-injectable-self-gelling-hydrogel-microparticle-composites-for-bone-regeneration-consisting-of-gellan-gum-and-calcium-and-magnesium-carbonate-microparticles
#6
Timothy E L Douglas, Agata Łapa, Katarzyna Reczyńska, Małgorzata Krok-Borkowicz, Krzysztof Pietryga, Sangram Keshari Samal, Heidi A Declercq, David Schaubroeck, Marijn Boone, Pascal Van der Voort, Karel De Schamphelaere, Christian V Stevens, Vitaliy Bliznuk, Lieve Balcaen, Bogdan V Parakhonskiy, Frank Vanhaecke, Veerle Cnudde, Elżbieta Pamuła, Andre G Skirtach
The suitability of hydrogel biomaterials for bone regeneration can be improved by incorporation of an inorganic phase in particle form, thus maintaining hydrogel injectability. In this study, carbonate microparticles containing different amounts of calcium (Ca) and magnesium (Mg) were added to solutions of the anionic polysaccharide gellan gum (GG) to crosslink GG by release of Ca(2+) and Mg(2+) from microparticles and thereby induce formation of hydrogel-microparticle composites. It was hypothesized that increasing Mg content of microparticles would promote GG hydrogel formation...
November 21, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27860105/dehydrogenation-properties-of-fe-fe-c-and-fe-mg-additives-loaded-magnesium-hydride
#7
Pukazhselvan D, Narendar Nasani, Tao Yang, Igor Bdikin, Andrei V Kovalevsky, Duncan Paul Fagg
This study highlights that Fe additive offers better catalytic properties than carbon, Fe-C (iron carbide/carbon composites) and Fe-Mg (Mg2FeH6) additives for the low temperature dehydrogenation of magnesium hydride. In-situ XRD study proves the formation of Mg2FeH6 phase in the iron additive loaded MgH2. Nonetheless, DSC study suggests that this Mg2FeH6 phase does not present any catalytic influence for MgH2. On the other hand, the composite system Mg2FeH6/MgH2 shows significantly improved dehydrogenation properties even in absence of further additives...
November 17, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27849033/in-situ-catalyzation-approach-for-enhancing-the-hydrogenation-dehydrogenation-kinetics-of-mgh2-powders-with-ni-particles
#8
M Sherif El-Eskandarany, Ehab Shaban, Naser Ali, Fahad Aldakheel, Abdullah Alkandary
One practical solution for utilizing hydrogen in vehicles with proton-exchange fuel cells membranes is storing hydrogen in metal hydrides nanocrystalline powders. According to its high hydrogen capacity and low cost of production, magnesium hydride (MgH2) is a desired hydrogen storage system. Its slow hydrogenation/dehydrogenation kinetics and high thermal stability are the major barriers restricting its usage in real applications. Amongst the several methods used for enhancing the kinetics behaviors of MgH2 powders, mechanically milling the powders with one or more catalyst species has shown obvious advantages...
November 16, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27837349/comparison-of-body-composition-and-nutrients-deficiencies-between-portuguese-rink-hockey-players
#9
Maria-Raquel G Silva, Hugo-Henrique Silva
: We evaluated dietary intake and body composition of child and adolescent rink-hockey players and controls. Seventy-two male rink-hockey players (38 children and 34 adolescents) and 79 male controls (43 children and 36 adolescents) were evaluated in order to collect training data, detailed dietary intake and body composition. Rink-hockey players presented significantly lower body fat (BF) and higher fat-free mass (FFM) than controls. Mean intakes of carbohydrate and protein were considered to be adequate, but mean intakes of fat were above the recommended levels in athletes...
November 12, 2016: European Journal of Pediatrics
https://www.readbyqxmd.com/read/27836340/short-term-low-severity-spring-grassland-fire-impacts-on-soil-extractable-elements-and-soil-ratios-in-lithuania
#10
Paulo Pereira, Artemi Cerda, Deborah Martin, Xavier Úbeda, Daniel Depellegrin, Agata Novara, Juan F Martínez-Murillo, Eric C Brevik, Oleksandr Menshov, Jesus Rodrigo Comino, Jessica Miesel
Spring grassland fires are common in boreal areas as a consequence of slash and burn agriculture used to remove dry grass to increase soil nutrient properties and crop production. However, few works have investigated fire impacts on these grassland ecosystems, especially in the immediate period after the fire. The objective of this work was to study the short-term impacts of a spring grassland fire in Lithuania. Four days after the fire we established a 400m(2) sampling grid within the burned area and in an adjacent unburned area with the same topographical, hydrological and pedological characteristics...
November 8, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27836109/characterization-of-synthesized-and-commercial-forms-of-magnesium-stearate-using-differential-scanning-calorimetry-thermogravimetric-analysis-powder-x-ray-diffraction-and-solid-state-nmr-spectroscopy
#11
Sean P Delaney, Matthew J Nethercott, Christopher J Mays, Nickolas T Winquist, Donia Arthur, Julie L Calahan, Manish Sethi, Daniel S Pardue, Junghyun Kim, Gregory Amidon, Eric J Munson
Magnesium stearate is the salt of a complex mixture of fatty acids, with the majority being stearate and palmitate. It has multiple crystalline forms and, potentially, an amorphous form. Magnesium stearate is used in the pharmaceutical manufacturing industry as a powder lubricant, and typically is added at low levels (∼1%) during the manufacturing process and blended for a relatively short time (∼5 min). Proper levels and mixing times are needed, as too short a mixing time or too small a quantity will result in improper lubrication, and too much can negatively impact dissolution rates...
November 8, 2016: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27821762/x-ray-and-cryo-em-structures-of-monomeric-and-filamentous-actin-like-protein-mamk-reveal-changes-associated-with-polymerization
#12
Jan Löwe, Shaoda He, Sjors H W Scheres, Christos G Savva
Magnetotactic bacteria produce iron-rich magnetic nanoparticles that are enclosed by membrane invaginations to form magnetosomes so they are able to sense and act upon Earth's magnetic field. In Magnetospirillum and other magnetotactic bacteria, to combine their magnetic moments, magnetosomes align along filaments formed by a bacterial actin homolog, MamK. Here, we present the crystal structure of a nonpolymerizing mutant of MamK from Magnetospirillum magneticum AMB-1 at 1.8-Å resolution, revealing its close similarity to actin and MreB...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27814707/serum-phosphate-and-magnesium-in-children-recovering-from-severe-acute-undernutrition-in-ethiopia-an-observational-study
#13
Anne-Louise Hother, Tsinuel Girma, Maren J H Rytter, Alemseged Abdissa, Christian Ritz, Christian Mølgaard, Kim F Michaelsen, André Briend, Henrik Friis, Pernille Kæstel
BACKGROUND: Children with severe acute malnutrition (SAM) have increased requirements for phosphorus and magnesium during recovery. If requirements are not met, the children may develop refeeding hypophosphatemia and hypomagnesemia. However, little is known about the effect of current therapeutic diets (F-75 and F-100) on serum phosphate (S-phosphate) and magnesium (S-magnesium) in children with SAM. METHODS: Prospective observational study, with measurements of S-phosphate and S-magnesium at admission, prior to rehabilitation phase and at discharge in children aged 6-59 months admitted with SAM to Jimma Hospital, Ethiopia...
November 5, 2016: BMC Pediatrics
https://www.readbyqxmd.com/read/27805328/hypomagnesemia-in-the-icu-does-correction-matter
#14
B Sheba Charles, Indira Menon, T S Girish, A M Cherian
BACKGROUND: Magnesium is a cation that is constantly being rediscovered. A number of studies have linked low magnesium levels to poor outcome of critically ill patients. Despite this hypomagnesemia continues to be under-recognized and uncorrected. There are no studies, in our knowledge, that have assessed the impact of correction of hypomagnesaemia on the outcome of the ICU patient. AIMS AND OBJECTIVE: To determine the standard Mg levels in a healthy population sample and to correlate it with western data...
November 2016: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/27804851/association-between-waist-circumference-and-magnesium-and-uric-acid-in-indigenous-argentinean-children-living-at-high-altitude
#15
Valeria Hirschler, M Esteban, C González, C Molinari, L Castano
BACKGROUND: Studies in adults show that central obesity increases the likelihood of Type 2 diabetes (T2DM). OBJECTIVE: To determine the association between waist circumference (WC) and non-traditional risk factors such as magnesium (Mg), phosphorus, and uric acid in indigenous children living at high altitudes. METHODS: A total of 354 (166 M) indigenous school children, aged 9.6 + 2.3 years, were enrolled in a cross-sectional study in November 2011...
October 29, 2016: Cardiovascular & Hematological Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/27803672/autosomal-dominant-hypocalcemia-hypoparathyroidism-types-1-and-2
#16
REVIEW
Kelly L Roszko, Ruiye D Bi, Michael Mannstadt
Extracellular calcium is essential for life and its concentration in the blood is maintained within a narrow range. This is achieved by a feedback loop that receives input from the calcium-sensing receptor (CASR), expressed on the surface of parathyroid cells. In response to low ionized calcium, the parathyroids increase secretion of parathyroid hormone (PTH) which increases serum calcium. The CASR is also highly expressed in the kidneys, where it regulates the reabsorption of calcium from the primary filtrate...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27797880/ventricular-fibrillation-via-torsade-des-pointes-of-cardiac-sarcoidosis-with-preserved-left-ventricular-ejection-fraction
#17
Takayuki Sekihara, Eisaku Nakane, Kazutaka Nakasone, Moriaki Inoko
Generally, low left ventricular ejection fraction (LVEF) is a risk for ventricular arrhythmia in patients with cardiac sarcoidosis. We present a case of cardiac sarcoidosis with preserved LVEF that evoked ventricular fibrillation (VF). A 73-year-old woman with VF presented to our emergency department. She had a history of ocular sarcoidosis, with gradual thinning of the basal intraventricular septum. LVEF was 62% on the most recent echocardiography. The electrocardiogram after defibrillation showed complete atrioventricular block (CAVB) with QT segment prolongation and frequent ventricular premature beats...
October 25, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/27791301/magnesocene-based-electrolytes-a-new-class-of-electrolytes-for-magnesium-batteries
#18
Rainer Schwarz, Marijana Pejic, Philipp Fischer, Mario Marinaro, Ludwig Jörissen, Mario Wachtler
Unlike ferrocene, bis(η(5) -cyclopentadienyl)magnesium (magnesocene, MgCp2 ) is slightly dissociated in solvents, such as ethers, resulting in electrolyte solutions with low conductivity. MgCp2 /tetrahydrofuran solutions make possible reversible magnesium plating and stripping with low over-potentials for many cycles. The Mg deposits appear with a cauliflower-like morphology. IR and NMR spectroscopy confirm that the electrolyte is stable and not decomposed during prolonged cycling. The anodic stability limit is in the range of 1...
October 28, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27788811/effects-of-intraoperative-magnesium-sulfate-administration-on-postoperative-tramadol-requirement-in-liver-transplantation-a-prospective-double-blind-study
#19
B Gucyetmez, H K Atalan, S Aslan, S Yazar, K Y Polat
BACKGROUND: Magnesium is an N-methyl-d-aspartate receptor blocker and is known to have analgesic effect. Hypomagnesemia can often be seen in liver transplantation and may be associated with higher morbidity and mortality. The objective of this study was to investigate the effects of intraoperative magnesium sulfate administration on postoperative tramadol requirement in liver transplant patients. METHODS: Liver transplant patients >18 years of age were screened prospectively from October 2014 to April 2015...
October 2016: Transplantation Proceedings
https://www.readbyqxmd.com/read/27786388/oxygenation-chemistry-of-magnesium-alkyls-incorporating-%C3%AE-diketiminate-ligands-revisited
#20
Tomasz Pietrzak, Marcin Kubisiak, Iwona Justyniak, Karolina Zelga, Emil Bojarski, Ewa Tratkiewicz, Zbigniew Ochal, Janusz Lewiński
Despite the fact that extensive research has been carried out, the oxygenation of alkyl magnesium species still remains a highly unexplored research area and significant uncertainties concerning the mechanism of these reactions and the composition of the resulting products persist. This case study compares the viability of the controlled oxygenation of alkylmagnesium complexes supported by β-diketiminates. The structural tracking of the reactivity of (N,N)MgR-type complexes towards O2 at low temperature showed that their oxygenation led exclusively to the formation of magnesium alkylperoxides (N,N)MgOOR...
October 27, 2016: Chemistry: a European Journal
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