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Journal of Biomedical Materials... Oct 2014Owing to their mechanical properties, metallic materials present a promising solution in the field of resorbable implants. The magnesium metabolism in humans differs... (Review)
Review
Owing to their mechanical properties, metallic materials present a promising solution in the field of resorbable implants. The magnesium metabolism in humans differs depending on its introduction. The natural, oral administration of magnesium via, for example, food, essentially leads to an intracellular enrichment of Mg(2+) . In contrast, introducing magnesium-rich substances or implants into the tissue results in a different decomposition behavior. Here, exposing magnesium to artificial body electrolytes resulted in the formation of the following products: magnesium hydroxide, magnesium oxide, and magnesium chloride, as well as calcium and magnesium apatites. Moreover, it can be assumed that Mg(2+) , OH(-) ions, and gaseous hydrogen are also present and result from the reaction for magnesium in an aqueous environment. With the aid of physiological metabolic processes, the organism succeeds in either excreting the above mentioned products or integrating them into the natural metabolic process. Only a burst release of these products is to be considered a problem. A multitude of general tissue effects and responses from the Mg's degradation products is considered within this review, which is not targeting specific implant classes. Furthermore, common alloying elements of magnesium and their hazardous potential in vivo are taken into account.
Topics: Alloys; Humans; Magnesium; Metabolism; Organ Specificity; Prostheses and Implants
PubMed: 24222399
DOI: 10.1002/jbm.a.35023 -
Journal of the American Association For... Sep 2021Cephalopods are important in biologic and biomedical research, yet relatively little objective information is available to guide researchers and veterinarians regarding...
Cephalopods are important in biologic and biomedical research, yet relatively little objective information is available to guide researchers and veterinarians regarding the best methods for anesthetizing these animals for various experimental procedures. Recent studies demonstrate that ethyl alcohol and magnesium chloride are effective at depressing efferent and afferent neural signals in some tropical cephalopod species when measured via the pallial nerve. Here we used similar methods to test 2 temperate species ( and ) and demonstrate that (1) ethyl alcohol and magnesium chloride were effective at reversibly depressing evoked activity in the pallial nerve, (2) ethyl alcohol generally had shorter induction and recovery times compared with magnesium chloride, (3) both agents were associated with a latency between the behavioral and neural effects, and it was longer with magnesium chloride, and (4) senescent animals generally had longer induction or recovery times than young animals. Both agents successfully anesthetized both life stages; however, our data show that assessing anesthesia based solely on behavior may lead to premature commencement of invasive procedures. We conclude that temperate cephalopods can be humanely, effectively, and completely anesthetized by using these 2 agents and that the loss of neural signal we show here is consistent with true anesthesia and not merely paralysis. This relatively simple, nondestructive nerve recording technique can be applied to the study of other prospective anesthetic agents in cephalopods.
Topics: Anesthetics; Animals; Decapodiformes; Ethanol; Magnesium Chloride; Octopodiformes; Prospective Studies
PubMed: 34233805
DOI: 10.30802/AALAS-JAALAS-20-000076 -
European Heart Journal. Cardiovascular... Apr 2017Magnesium is the fourth most abundant cation in the human body and is the second most prevalent cation in intracellular tissues. Myocardial cell action potentials are... (Review)
Review
Magnesium is the fourth most abundant cation in the human body and is the second most prevalent cation in intracellular tissues. Myocardial cell action potentials are mediated by voltage-dependent Na+, K+, and Ca2+ channels which, when their function is altered, can lead to the genesis of cardiac dysrythmias. Magnesium regulates the movement of ions through these channels within myocardial tissues. The potential ability of magnesium supplementation to prevent and/or treat arrhythmias has been recognized in clinical medicine for years. This includes termination of torsade de pointes, prevention of post-operative atrial fibrillation, acute treatment of atrial fibrillation, and improving the efficacy and safety of antiarrhythmic drugs. Despite what is currently known about magnesium's therapeutic potential, a number of limitations and gaps to the literature exist. This includes an unclear link between correction of intracellular magnesium concentrations and both mechanistic and clinical outcomes, small sample sizes, varying routes of administration and doses, as well as short follow-up periods. This review highlights these gaps and recommends areas of need for future research.
Topics: Arrhythmias, Cardiac; Biomedical Research; Electrocardiography; Heart Conduction System; Humans; Magnesium; Magnesium Chloride
PubMed: 27634841
DOI: 10.1093/ehjcvp/pvw028 -
Methods in Molecular Biology (Clifton,... 2022The protocol outlined in this chapter describes a detailed procedure for protoplast isolation and transformation using polyethylene glycol (PEG)-mediated transfection...
The protocol outlined in this chapter describes a detailed procedure for protoplast isolation and transformation using polyethylene glycol (PEG)-mediated transfection and DNA microinjection, highlighting also the critical steps associated with the method. Briefly, we will describe the efficient isolation of protoplasts from 3-month-old suspension calli collected at 14 days after cultured. Digestion of the calli with an optimal composition of enzyme solution yielded over 2 × 10 protoplasts/mL with the viability of more than 80%. The concentrations of DNA, PEG, and magnesium chloride and application of heat shock treatment are the crucial determinants for efficient PEG-mediated transfection. Using the optimal PEG transfection conditions, a transfection efficiency of more than 20% could be obtained. At the same time, protoplasts embedded in alginate layer cultured for 3 days and injected with 100 ng/μL of total DNA solution are the optimal factors for microinjection. We successfully regenerated the injected protoplasts to calli expressing green fluorescent protein (GFP) signals when cultured in optimal medium and cultivation procedures.
Topics: DNA; Microinjections; Polyethylene Glycols; Protoplasts; Transfection
PubMed: 35258834
DOI: 10.1007/978-1-0716-2164-6_14 -
The Cochrane Database of Systematic... Aug 2016The ideal intravenous fluid for kidney transplantation has not been defined, despite the common use of normal saline during the peri-operative period. The high chloride... (Meta-Analysis)
Meta-Analysis Review
BACKGROUND
The ideal intravenous fluid for kidney transplantation has not been defined, despite the common use of normal saline during the peri-operative period. The high chloride content of normal saline is associated with an increased risk of hyperchloraemic metabolic acidosis, which may in turn increase the risk of hyperkalaemia and delayed graft function. Balanced electrolyte solutions have a lower chloride content which may decrease this risk and avoid the need for dialysis due to hyperkalaemia in the immediate post-transplant period. Randomised controlled trials (RCTs) addressing this issue have used biochemical outcomes to compare fluids and have been underpowered to address patient-centred outcomes such as delayed graft function.
OBJECTIVES
To examine the effect of lower-chloride solutions versus normal saline on delayed graft function, hyperkalaemia and acid-base status in kidney transplant recipients.
SEARCH METHODS
We searched the Cochrane Kidney and Transplant's Specialised Register to 26 November 2015 through contact with the Information Specialist using search terms relevant to this review.
SELECTION CRITERIA
RCTs of kidney transplant recipients that compared peri-operative intravenous lower-chloride solutions to normal saline were included.
DATA COLLECTION AND ANALYSIS
Two independent investigators assessed studies for eligibility and risk of bias. Data from individual studies were extracted using standardised forms and pooled according to a published protocol. Summary estimates of effect were obtained using a random-effects model, and results were expressed as risk ratios (RR) and their 95% confidence intervals (CI) for dichotomous outcomes, and mean difference (MD) and 95% CI for continuous outcomes.
MAIN RESULTS
Six studies (477 participants) were included in the review. All participants were adult kidney transplant recipients and 70% of participants underwent live-donor kidney transplantation. The overall risk of bias was low for selection bias and unclear for remaining domains. There was no difference in the risk of delayed graft function (3 studies, 298 participants: RR 1.03, 95% CI 0.62 to 1.70) or hyperkalaemia (2 studies, 199 participants: RR 0.48, 95% CI 0.04 to 6.10) for participants who received balanced electrolyte solutions compared to normal saline. Intraoperative balanced electrolyte solutions compared to normal saline were associated with higher blood pH (3 studies, 193 participants: MD 0.07, 95% CI 0.05 to 0.09), higher serum bicarbonate (3 studies, 215 participants: MD 3.02 mEq/L, 95% CI 2.00 to 4.05) and lower serum chloride (3 studies, 215 participants: MD -9.93 mmol/L, 95% CI -19.96 to 0.11). There were four cases of graft loss in the normal saline group and one in the balanced electrolyte solution group, and four cases of acute rejection in the normal saline group compared to two cases in the balanced electrolyte solution group.
AUTHORS' CONCLUSIONS
Balanced electrolyte solutions are associated with less hyperchloraemic metabolic acidosis compared to normal saline, however it remains uncertain whether lower-chloride solutions lead to improved graft outcomes compared to normal saline.
Topics: Adult; Delayed Graft Function; Gluconates; Humans; Hydrogen-Ion Concentration; Hyperkalemia; Infusions, Intravenous; Isotonic Solutions; Kidney; Kidney Transplantation; Magnesium Chloride; Potassium Chloride; Ringer's Solution; Sodium Acetate; Sodium Chloride; Solutions
PubMed: 27502170
DOI: 10.1002/14651858.CD010741.pub2 -
Critical Reviews in Eukaryotic Gene... 2018The evolution of antibiotic resistance in bacteria has increased research in the development of alternative therapies to conventional drugs. In this study, isolated... (Review)
Review
The evolution of antibiotic resistance in bacteria has increased research in the development of alternative therapies to conventional drugs. In this study, isolated phages were characterized and antibacterial activity was determined by standard agar disc diffusion method. The phages showed maximum propagation at 37°C to 40°C and highest viability at pH 7. Sugars influenced the bacteriophage viability. Sodium chloride decreased the phage propagation. Calcium chloride and magnesium chloride increased the phage propagation up to a certain limit. SDS-PAGE analysis confirmed the presence of protein cover and showed the various bands ranging from 10 to 200 kDa. Nucleic acid analysis confirmed the presence of RNA with a size of approximately 20 kb. Transmission electron microscopy indicated that the phages belong to Siphoviridae, Leviviridae, and Podoviridae families.
Topics: Anti-Bacterial Agents; Bacteria; Bacteriophages; Hydrogen-Ion Concentration; Microbial Viability; Temperature
PubMed: 29773011
DOI: 10.1615/CritRevEukaryotGeneExpr.2017019608 -
Bioanalysis Jul 2023The presence of di-/multi-meric forms of soluble target in biological samples can interfere in anti-drug antibody (ADA) assays, leading to increased background values...
The presence of di-/multi-meric forms of soluble target in biological samples can interfere in anti-drug antibody (ADA) assays, leading to increased background values and potentially false positivity. The authors investigated the use of the high ionic strength dissociation assay (HISDA) to reduce target interference in two different ADA assays. Interference caused by homodimeric FAP was successfully eliminated to enable cut point determination after applying HISDA. Biochemical experiments confirmed the dissociation of homodimeric FAP after treatment with high ionic strength conditions. HISDA is a promising approach to simultaneously achieve high drug tolerance and reduced interference by noncovalently bound dimeric target molecules in ADA assays without extensive optimization, which is particularly advantageous in routine use.
Topics: Antibodies; Drug Tolerance
PubMed: 37326333
DOI: 10.4155/bio-2023-0082 -
Zoo Biology 2023Magnesium chloride in high concentration is used for euthanasia of jellyfish to limit overpopulation and for predatory species consumption, but its use could lead to...
Magnesium chloride in high concentration is used for euthanasia of jellyfish to limit overpopulation and for predatory species consumption, but its use could lead to magnesium bioaccumulation and subsequent negative effects in consumers. Two species of scyphozoan jellyfish (Cassiopea andromeda and Aurelia aurita) were subjected to freezing (control), or magnesium chloride baths (144 g/L), with subsequent 30 min baths (one or two) in fresh artificial saltwater and submitted for inductively coupled plasma analysis to determine tissue concentration. Frozen jellyfish consistently yielded the lowest magnesium concentrations, while magnesium chloride euthanized individuals contained the highest concentrations in both species. C. andromeda displayed a significantly higher (p < .05) magnesium absorption capacity than A. aurita in both trials. Single and double baths significantly decreased magnesium concentrations (p < .05) in both species, however, magnesium remained consistently elevated compared to frozen specimens. This study demonstrated species-specific magnesium accumulation in jellyfish posteuthanasia and that rinsing was an effective method to limit excessive magnesium that could be deleterious to animals in public display aquaria. Magnesium concentrations of tissue and receiving water should be tested if magnesium chloride euthanasia is utilized for dietary supplementation in small bodies of water.
Topics: Humans; Animals; Scyphozoa; Magnesium; Magnesium Chloride; Euthanasia, Animal; Animals, Zoo; Water
PubMed: 37101420
DOI: 10.1002/zoo.21770 -
Annals of Family Medicine Apr 2022Depression affects up to 15% of community-dwelling older adults. Late-life depression is frequently underdiagnosed and undertreated. When depression in older adults is...
CONTEXT
Depression affects up to 15% of community-dwelling older adults. Late-life depression is frequently underdiagnosed and undertreated. When depression in older adults is identified, up to 80% of treatment occurs in primary care. Currently available treatments have significant limitations (e.g., modest effectiveness, high costs, adverse effects, poor adherence, and social stigma), therefore additional treatment options are essential. Over the counter magnesium chloride is inexpensive, widely available, generally safe, well-absorbed, and was efficacious in prior studies, often within 2 weeks.
OBJECTIVE
To collect background information on magnesium supplement use and acceptability in older adults with a depression.
STUDY DESIGN
Online survey.
DATASET
National sample.
POPULATION STUDIED
Adults 65 and older living in the United States currently experiencing symptoms of depression based on Patient Health Questionnaire (PHQ- 2) results.
OUTCOME MEASURES
The primary outcome was willingness to take magnesium supplements instead of prescription medication for the treatment of depression. Secondary measures included current supplement use, comfort level with taking magnesium to treat depression, and whether they think magnesium would help improve symptoms of depression.
RESULTS
Of 153 respondents, 97 (63%) were female, 143 (93%) identified as white, and 130 (85%) were between the ages 65 and 75 years. 112 (73%) took a supplement daily, including 15 (10%) taking magnesium. 50 (33%) were currently being treated for depression. On a 4-point Likert scale ranging from "Strongly Agree" to "Strongly Disagree," 83% of respondents "Agreed" or "Strongly Agreed" in terms of their willingness to take magnesium instead of a prescription medication. A majority also "Agreed" or "Strongly Agreed" that they were willing (89%) and comfortable (89%) with taking magnesium to treat depression and also that it would improve symptoms of depression (73%). Women were more likely to agree with these statements (p<0.05), but there were no differences based on age or current treatment for depression.
CONCLUSIONS
A majority of older community-dwelling adults are willing to take magnesium for the treatment of depression. Many adults are already taking at least 1 over the counter supplement daily. Further research is needed to determine the efficacy of magnesium supplements as an alternative treatment option in this population.
Topics: Aged; Depression; Female; Humans; Independent Living; Magnesium; Male; Prescription Drugs; Surveys and Questionnaires; United States
PubMed: 35904841
DOI: 10.1370/afm.20.s1.3075 -
International Journal of Biological... Apr 2022As a new starch gelatinization method, salt induced gelatinization can not only reduce energy consumption but also impart special physicochemical properties to starch...
As a new starch gelatinization method, salt induced gelatinization can not only reduce energy consumption but also impart special physicochemical properties to starch gel. In this study, the process and mechanism of MgCl induced starch gelatinization were explored. The results showed that, potato starch could be gelatinized after a treatment of 4 mol/L MgCl for 3 h. The gelatinization started with the slight damage of outer shells, then the internal molecules leached out through the cracks or holes to form gel, finally the outer shells disintegrated. During the gelatinization process, the viscosity and granule size gradually increased after 0.5 h, while the original crystallinity disappeared rapidly in 0.5 h. Besides, MgCl significantly increased the electrostatic interaction, then made starch molecules closer to each other and become denser, which may have close relationship with the appearance of the cracks and the disappearance of crystallization. Moreover, MgCl enhanced the hydration and increased the binding free energy of starch molecules, then promoted starch gelatinization and accelerated the destruction of starch structure, which may be the critical factors of the starch gelatinization induced by MgCl. The results will provide reference for the research and application of salt induced gelatinization.
Topics: Chemical Phenomena; Crystallization; Magnesium Chloride; Starch; Viscosity
PubMed: 35181319
DOI: 10.1016/j.ijbiomac.2022.02.061