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1.
Heliyon ; 10(6): e28131, 2024 Mar 30.
Article in English | MEDLINE | ID: mdl-38524537

ABSTRACT

Background: There are various materials used for socket preservation following dental extraction. The aim of the present animal study was to histologically investigate the efficacy of buccal fat autotransplantation on alveolar bone regeneration following dental extraction. Study design: In this prospective, double-blind laboratory experiment with a split-mouth design, 16 mandibular second premolar teeth in eight beagle dogs were extracted, and half of the extraction sockets were randomly filled using buccal fat autotransplantation. Other samples were left untouched to heal normally by the formed blood clot. Buccal fat autotransplantation was the primary predictor variable, and the type and amount of newly formed bone were the primary outcome variables. Assessment methods were the H & E coloring technique and histomorphometric evaluation. The significance level was set at 0.05, and data was subjected to Chi-Square and Wilcoxon signed-rank tests using SAS statistical software version 9.4. Results: From the total number of 16 samples in 8 dogs, 50% of the samples in the intervention group represented inflammation with lower intensity compared to 33% in the control group; however, this difference was not considered statistically significant (Chi-Square test, P-value = 0.55). Wilcoxon test results showed no statistically significant difference between the two groups regarding the mean amount of total bone formation (Z = 0.00, P-value = 1.00). Conclusion: It was inferred from the outcomes of the present study that when compared to the normal healing of the socket, buccal fat autotransplantation did not represent with superior outcome concerning the socket bone regeneration.

2.
Langmuir ; 39(44): 15535-15546, 2023 Nov 07.
Article in English | MEDLINE | ID: mdl-37879038

ABSTRACT

The adsorption equilibria and kinetic performance of CO2, CH4, and N2 on pelletized cation-exchanged faujasite zeolites (with alkali, alkaline earth, and transition metal ions) have been investigated by an innovative volumetric apparatus simultaneously. The standard instrumental analytical techniques, including X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy (EDX), and atomic absorption spectroscopy (AAS), were utilized to characterize binder-free modified zeolites. EDX and AAS analyses revealed that the ion exchange was successfully achieved. The results indicate that the type of cation present in the zeolite framework and the Si/Al ratio can have a significant impact on the adsorption capacity and kinetic performance. The obtained isotherms were determined by three isotherm models, and the Langmuir-Freundlich (Sips) model was found to show the best agreement with the experimental isotherm data for all gases. The CO2 uptakes of KX, MgX, and CaX reached 4.13, 4.79, and 5.48 mmol/g, respectively. The effective binary and kinetic selectivities of CO2/CH4 and CO2/N2 were also calculated. Among all samples, KX showed the highest CO2/CH4 and CO2/N2 selectivities of 54.46 and 91.62, respectively. Pseudo-first-, pseudo-second-order, and Avrami kinetic models were fitted to the experimental kinetic data to analyze the adsorption kinetics. Finally, the macropore diffusion coefficient (Dp) and microporous diffusional time constant (Dc/rc2) were estimated by correlating the micropore-macropore kinetic model with the experimental fractional uptake curves. Among the ion-exchanged zeolite samples, the K+ form exhibits a suitable performance in terms of kinetic behavior and adsorption capacity.

3.
Int Orthod ; 21(4): 100814, 2023 Dec.
Article in English | MEDLINE | ID: mdl-37776696

ABSTRACT

INTRODUCTION: The aim was to design a meta-analysis evaluating the positron emission tomography (PET) uptake and cerebrospinal fluid (CSF), circulating levels of amyloid-ß (Aß), and tau proteins OSA group versus control group, as well as the association of these biomarkers with the severity of OSA. MATERIAL AND METHODS: Four databases were searched until April 17, 2023, without any restrictions. The effect sizes were the standardized mean difference (SMD) along with a 95% confidence interval (CI). RESULTS: A total of 21 articles were entered into the meta-analysis. The pooled SMDs of the CSF levels in OSA adults compared to controls were: -0.82 (P=0.004) for Aß42, -1.13 (P<0.001) for Aß40, 0.17 (P=0.23) for p-tau, 0.04 (P=0.65) for t-tau, 0.08 (P=0.89) for Aß42/Aß40 ratio, and 0.81 (P=0.001) for t-tau/Aß42 ratio. The pooled SMD for the PET uptake of Aß burden in OSA adults compared to controls was 0.30 (P=0.03). The pooled SMDs of the circulating levels in OSA adults compared to controls were: 0.67 (P=0.002) for Aß42, 0.11 (P=0.82) for Aß40, 0.35 (P=0.06) for p-tau, and 1.41(P=0.005) for t-tau. The pooled SMDs for levels of Aß42, Aß40, total Aß, p-tau, t-tau, and Aß42/Aß40 ratio in severe OSA adults compared to mild/moderate OSA adults were -0.15 (P=0.33), 0.25 (P=35), 0.04 (P=87), -2.53 (P=0.24), -0.24 (P=0.52), and -0.28 (P=0.30), respectively. CONCLUSIONS: The results indicated that CSF levels of Aß42 and Aß40 in OSA adults were significantly lower, but the CSF level of t-tau/Aß42 ratio and PET Aß burden uptake in OSA adults significantly were higher than in controls.


Subject(s)
Alzheimer Disease , Sleep Apnea, Obstructive , Humans , Adult , Alzheimer Disease/diagnostic imaging , Alzheimer Disease/cerebrospinal fluid , Amyloid beta-Peptides/cerebrospinal fluid , tau Proteins/cerebrospinal fluid , Biomarkers
4.
Chemosphere ; 324: 138275, 2023 May.
Article in English | MEDLINE | ID: mdl-36889474

ABSTRACT

The effect of inorganic binder-based extrusion (Silica sol, Bentonite, Attapulgite, and SB1) in the selective adsorption of CO2, CH4, and N2 on zeolite 13X in the context of flue gas carbon capture and natural gas purification has been studied to reduce CO2 emissions. The effect of extrusion with binders was examined by adding 20 wt% of the mentioned binders to pristine zeolite and the results were analyzed by four approaches; (i) the effect on structural properties was analyzed by XRD patterns followed by Williamson-Hall (W-H) plot, FESEM images, and BET surface area. In addition, the mechanical strength of the shaped zeolites was measured by crush resistance testing; (ii) the effect on the adsorption capacity for CO2, CH4, and N2 were measured by volumetric apparatus up to 100 kPa; (iii) the impact on binary separation (CO2/CH4 and CO2/N2) were investigated; (iv) the influence on diffusion coefficients were estimated by micropore and macropore kinetic model. The results showed that the presence of a binder can cause reductions in BET surface area and pore volume, indicating partial pore blockage. It was found that the Sips model had the best adaptability to the experimental isotherms data. The trend of CO2 adsorption was 13X > pseudo-boehmite > bentonite > attapulgite > silica, in which the adsorption capacity reached 6.02, 5.60, 5.24, 5.00, and 4.71 mmol/g, respectively. Among all samples, silica was found the most suitable binder for CO2 capture in terms of selectivity, mechanical stability, and diffusion coefficients.


Subject(s)
Carbon Dioxide , Zeolites , Carbon Dioxide/chemistry , Zeolites/chemistry , Adsorption , Bentonite
5.
Dent Res J (Isfahan) ; 19: 82, 2022.
Article in English | MEDLINE | ID: mdl-36426278

ABSTRACT

Background: The main drawbacks of zirconia are its high refractive index and opacity. This study aimed to assess the effect of sintering temperature on the translucency of Ivoclar e. max ZirCAD (IEZ), and White Peaks Symphony (WPS) zirconia blocks. Materials and Methods: In this in vitro experimental study, 30 IEZ and 30 WPS zirconia blocks measuring 10 mm × 10 mm × 1 mm were prepared and underwent sintering in three subgroups at 1440°C, 1500°C, and 1530°C. The specimens were then photographed against a black and a white background with a standard digital camera. The L*, a*, and b* color parameters were measured using Adobe Photoshop software, and translucency was calculated. Data were analyzed using one-way ANOVA and Tukey's test (P < 0.05). Results: In both the IEZ and WPS groups, the maximum and minimum translucency parameters were recorded in 1530°C and 1440°C subgroups, respectively. The difference in the mean translucency was significant among the three subgroups of each zirconia group (P < 0.001). The mean translucency of WPS zirconia was significantly higher than that of IEZ zirconia (P < 0.01), and maximum difference was noted at 1500°C sintering temperature. Conclusion: Increasing the sintering temperature from 1440°C to 1530°C can significantly increase the translucency of IEZ and WPS zirconia blocks, and can be considered to improve the quality of zirconia restorations.

6.
Br J Oral Maxillofac Surg ; 60(8): 1068-1073, 2022 10.
Article in English | MEDLINE | ID: mdl-35989207

ABSTRACT

This study was performed to evaluate the effect of teriparatide therapy on the healing of osteochondral defects of the mandibular condylar. Ninety-six rats underwent surgery to create a defect in the condylar head on one side of the mandible, and were divided into two groups. One group received subcutaneous injection of 2 µg/kg/day teriparatide, and the other group received normal saline until sacrifice. On postoperative days 20, 40, and 60, 16 animals from each group were sacrificed, and bone and cartilage healing was histologically evaluated and semiquantitatively scored (1-5). The mean difference in healing score of the cartilaginous and subchondral parts of the defect between the teriparatide and control groups at days 20, 40 and 60 were 0.438 and 0.438, 0.813 and 0.750, and 1.125 and 0.813, respectively. The healing scores of the osteochondral defects in the teriparatide group were significantly (p< 0.05) higher than that in the control group at days 40 and 60. This study has shown beneficial effects of teriparatide on the healing of condylar osteochondral defects in rats. Clinical trials are required to extrapolate these findings to humans.


Subject(s)
Cartilage, Articular , Teriparatide , Animals , Cartilage , Mandibular Condyle , Rats , Saline Solution/pharmacology , Teriparatide/pharmacology , Teriparatide/therapeutic use , Wound Healing
7.
Life (Basel) ; 12(5)2022 May 16.
Article in English | MEDLINE | ID: mdl-35629405

ABSTRACT

Background and objective: A variety of diseases, including obesity, type ‖ diabetes, and cardiovascular diseases are associated with obstructive sleep apnea syndrome (OSAS), and decreased adiponectin levels have been shown to be associated with an increased risk of these diseases. However, the association of blood levels of adiponectin in OSAS patients is a challenging and unknown issue with conflicting results. Therefore, we performed a systematic review and a meta-analysis to evaluate plasma/serum adiponectin levels in adult patients with OSAS. Materials and methods: A comprehensive search in four databases (PubMed/Medline, Web of Science, Scopus, and Cochrane Library) was performed in literature dated older than 12 March 2022, to retrieve the relevant articles. Effect sizes were calculated to show the standardized mean difference (SMD) along with a 95% confidence interval (CI) of plasma/serum of adiponectin between the OSAS patients and controls. The software RevMan 5.3, NCSS 21.0.2, CMA 2.0, trial sequential analysis (TSA) 0.9.5.10 beta, and GetData Graph Digitizer 2.26 were used for data synthesis in the meta-analysis. Results: A total of 28 articles including 36 studies were entered into the meta-analysis. The results showed that pooled SMD was −0.71 (95% CI: −0.92, 0.50; p < 0.00001; I2 = 79%) for plasma/serum levels of adiponectin in OSAS cases compared to the controls. The subgroup analyses showed that the geographical region and the Apnea-Hypopnea-Index (AHI) could be confounding factors in the pooled analysis of plasma/serum adiponectin levels. The sensitivity analysis showed the stability of the results. The radial and L'Abbé plots confirmed evidence of heterogeneity. Trial sequential analysis showed sufficient cases in the meta-analysis. Conclusions: With sufficient cases and stable results, the main finding of the meta-analysis identified significantly reduced plasma/serum levels of adiponectin in OSAS cases compared with the controls. This result suggests a potential role of adiponectin in the pathogenesis of OSAS.

8.
3 Biotech ; 11(6): 260, 2021 Jun.
Article in English | MEDLINE | ID: mdl-33996372

ABSTRACT

In the present study, multiwalled carbon nanotubes (MWCNTs) were functionalized with glycyrrhizin and Tween 80 and applied for immobilization of Pseudomonas cepacia lipase (PcL). Characterization of f-MWCNTs was performed through Fourier-transform infrared spectroscopy, thermal gravimetric, field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy analysis. The optimum specific activity of immobilized PcL (studied by Plackett-Burman statistical design) occurred at 0.3 mg/mL of f-MWCNTs, 25 mM of phosphate buffer (pH 6.0), 15 min sonication time, 8 U/mL of enzyme concentration, and 24 h immobilization time at 4 °C in the absence of glutaraldehyde. In these conditions, the specific activity was 16.57 ± 0.71 U/mg, which was very close to the predicted amount (16.62 ± 0.64 U/mg). The results of thermal and pH stability showed that the stability of immobilized PcL was higher than that of the free PcL. The activity of immobilized PcL on f-MWCNTs held 93% after being incubated for 60 min at 70 °C. Moreover, the immobilized PcL on f-MWCNTs retained about 65% of its initial activity after 30 days of storage at 25 °C. In addition, about 50% of initial activity of immobilized PcL retained after 10 cycles of uses. Therefore, f-MWCNTs could be introduced as suitable support for enzymes immobilization.

9.
J Environ Sci Health B ; 56(4): 297-306, 2021.
Article in English | MEDLINE | ID: mdl-33560903

ABSTRACT

Malathion (MT) is one of the most widely used organophosphorus insecticides which induces toxicity through oxidative stress induction, free radical production and acetylcholinesterase inhibition. In this work, HepG2 cells were used to determine the effect of Zataria multiflora methanolic extract (MEZM) and rosmarinic acid (RA) on MT-induced cytotoxicity, oxidative stress, and apoptosis. Total phenolic content (TPC) and total flavonoid content (TFC) were determined and plant was further standardized based on RA content using HPLC method. The cultured HepG2 cells were pretreated with MEZM (1 µg/ml) and RA (0.1 µg/ml) for 4 h and exposed to MT (100 µM). Cell viability, oxidative stress biomarkers, ROS production, and cell death were examined after 24 h. The amount of RA was determined 73.48 mg/g dried extract. IC50 values of MEZM and MT were 368.56 µg/ml and 99.43 µM, respectively. Pretreatment with MEZM and RA decreased the cytotoxicity, oxidative stress, and cell percentage in the late apoptosis and necrosis stages induced by MT. There was no significant difference between MEZM and RA effects. The present study showed the significant protective effects of MEZM against toxicity induced by MT in hepatocytes which can be attributed to the plant antioxidant constituents including RA.


Subject(s)
Apoptosis/drug effects , Cinnamates/pharmacology , Depsides/pharmacology , Lamiaceae/chemistry , Malathion/toxicity , Oxidative Stress/drug effects , Antioxidants/chemistry , Antioxidants/pharmacology , Apoptosis/physiology , Cell Survival/drug effects , Cinnamates/analysis , Depsides/analysis , Flavonoids/analysis , Hep G2 Cells , Humans , Insecticides/toxicity , Methanol/chemistry , Oxidative Stress/physiology , Plant Extracts/chemistry , Plant Extracts/pharmacology , Protective Agents/chemistry , Protective Agents/pharmacology , Reactive Oxygen Species/metabolism , Rosmarinic Acid
11.
Am J Med ; 133(8): 908-915, 2020 08.
Article in English | MEDLINE | ID: mdl-32325048

ABSTRACT

Tobacco consumption (predominantly cigarettes) is the leading preventable cause of mortality worldwide. Although the major focus of strategies to reduce mortality from tobacco must include prevention of future generations from initially gaining access, some smokers are unwilling or unable to quit. Can the higher risk chronic smoker be identified and can their risk be reduced? The risk of adverse events in cigarette smokers is influenced by the intensity and duration of cigarette smoking or secondhand exposure, associated conventional risk factors, environmental stressors, and certain genetic variants and epigenetic modifiers. Recent data suggest that inflammatory markers such as high-sensitivity C-reactive protein (hs CRP) and targeted imaging can identify some smokers at higher risk. As smoking is prothrombotic, aspirin initiation and expanded statin use might reduce cardiovascular risk in those who do not presently meet criteria for these therapies, but further study is required. Thus, although advocacy for smoking cessation should always be the primary approach, increased efforts are needed to identify and potentially treat those who are unable or unwilling to quit.


Subject(s)
Cigarette Smoking/therapy , Primary Prevention/methods , Smoking Cessation , Aortic Aneurysm, Abdominal/diagnostic imaging , Aspirin/therapeutic use , Cardiovascular Diseases/prevention & control , Early Detection of Cancer , Humans , Hydroxymethylglutaryl-CoA Reductase Inhibitors/therapeutic use , Lung Neoplasms/diagnostic imaging , Mass Screening , Platelet Aggregation Inhibitors/therapeutic use , Risk Assessment , Risk Reduction Behavior , Smoking Reduction
12.
Toxicology ; 433-434: 152407, 2020 03 30.
Article in English | MEDLINE | ID: mdl-32061663

ABSTRACT

Paraquat (PQ) is a fast-acting and effective herbicide that is used throughout the world to eliminate weeds. Over the past years, PQ was considered one of the most popular poisoning substances for suicide, and PQ poisoning accounts for about one-third of suicides around the world. Poisoning with PQ may cause multiorgan failure, pulmonary fibrosis, and ultimately death. Exposure to PQ results in the accumulation of PQ in the lungs, causing severe damage and, eventually, fibrosis. Until now, no effective antidote has been found to treat poisoning with PQ. In general, the toxicity of PQ is due to the formation of high energy oxygen free radicals and the peroxidation of unsaturated lipids in the cell. Ferroptosis is the result of the loss of glutathione peroxidase 4 (GPX4) activity that transforms iron-dependent lipid hydroperoxides to lipid alcohols, which are inert in the biological environment. Impaired iron metabolism and lipid peroxidation are increasingly known as the driving agents of ferroptosis. The contribution of ferroptosis to the development of cell death during poisoning with PQ has not yet been addressed. There is growing evidence about the relationship between PQ poisoning and ferroptosis. This raises the possibility of using ferroptosis inhibitors for the treatment of PQ poisoning. In this hypothesis-driven review article, we elaborated how ferroptosis inhibitors might circumvent the toxicity induced by PQ and may be potentially useful for the treatment of PQ toxicity.


Subject(s)
Antidotes , Ferroptosis , Paraquat , Animals , Humans , Antidotes/pharmacology , Cell Death/drug effects , Ferroptosis/drug effects , Free Radicals/metabolism , Herbicides/poisoning , Lipid Peroxidation/drug effects , Multiple Organ Failure/chemically induced , Multiple Organ Failure/prevention & control , Paraquat/poisoning
13.
Biol Trace Elem Res ; 197(1): 132-140, 2020 Sep.
Article in English | MEDLINE | ID: mdl-31782064

ABSTRACT

We report here a simple microwave irradiation method (850 W, 3 min) for the synthesis of palladium nanoparticles (Pd NPs) using ascorbic acid (as reducing agent) and sodium alginate (as stabilizer agent). The synthesized nanoparticles were characterized using transmission electron microscopy (TEM), energy dispersive X-ray (EDX), X-ray diffraction spectroscopy (XRD), UV-Visible spectroscopy, and Fourier transform infrared spectroscopy (FTIR) techniques. Antioxidant properties and cytotoxic effects of as-synthesized Pd NPs and Pd (II) acetate were also assessed. UV-Vis study showed the formation of Pd NPs with maximum absorption at 345 nm. From TEM analysis, it was observed that the Pd NPs had spherical shape with particle size distribution of 13-33 nm. Based on DPPH radical scavenging activity and reducing power assay, the antioxidant activities of Pd NPs were significantly higher than the Pd (II) acetate (p < 0.05). At the same concentration of 640 µg/mL, the scavenging activities were 32.9 ± 3.2% (Pd (II) acetate) and 27.2 ± 2.1% (Pd NPs). For A549 cells treated 48 h with Pd NPs, Pd (II) acetate, and cisplatin, the measured concentration necessary causing 50% cell death (IC50) was 7.2 ± 1.7 µg/mL, 32.1 ± 2.1 µg/mL, and 206.2 ± 3.5 µg/mL, respectively. On HSkMC cells, the IC50 of the Pd NPs (320 µg/mL) was higher compared to Pd (II) acetate (228.7 ± 3.6 µg/mL), which confirmed lower cytotoxicity of the Pd NPs.


Subject(s)
Carcinoma , Metal Nanoparticles , A549 Cells , Antioxidants/pharmacology , Fibroblasts , Humans , Lung , Microwaves , Palladium , Plant Extracts , Spectroscopy, Fourier Transform Infrared , X-Ray Diffraction
14.
Pak J Pharm Sci ; 32(5): 2167-2173, 2019 Sep.
Article in English | MEDLINE | ID: mdl-31813884

ABSTRACT

Shilajit, a blackish-brown exudation obtained from steep rocks of different mountains, has been longly used as a therapeutic agent in traditional medicine. The present study was designed to evaluate the antioxidant, cytotoxic and hyperalgesia-suppressing activity of the aqueous and DMSO extracts of a native Shilajit. The antioxidant and cytotoxic effects of Shilajit extracts was determined using DPPH scavenging activity and MTT assay methods, respectively. In order to examine the hyperalgesia-suppressing activity of the Shilajit aqueous extract the STZ-induced diabetic animals were subjected to oral administration of the extract (50, 100 and 200 mg/kg daily) for six weeks followed by evaluating the behavioral examination (hot plate and tail flick tests) compared to those of diabetic control (Sham) and vehicle groups. The obtained results of antioxidant evaluation of Shilajit represented scavenging activity of 50% at concentration of 2500 µg/mL and 6000 µg/mL in the case of aqueous and DMSO extracts, respectively. Cytotoxic study of water extract of Shilajit revealed IC50 of 727.5±1.9 µg/mL and 1103±3.2 µg/mL on cell lines of MCF-7 (breast cancer) and A549 (lung cancer), respectively. Thermal pain response examination of diabetic rats treated with aqueous extract of Shilajit (100 mg/kg and 200 mg/kg) for six weeks reduced hyperalgesia compared to vehicle and Sham groups. To sum up, considering the moderate antioxidant and hyperalgesia-suppressing activity of this native Shilajit make it as a suitable candidate for further investigation after isolation and characterization of the active compounds.


Subject(s)
Antioxidants/pharmacology , Cytotoxins/pharmacology , Hyperalgesia/drug therapy , Minerals/chemistry , Resins, Plant/chemistry , A549 Cells , Animals , Cell Line, Tumor , Humans , MCF-7 Cells , Male , Phytotherapy/methods , Plant Extracts/pharmacology , Rats , Rats, Sprague-Dawley
16.
J Sep Sci ; 42(19): 3102-3109, 2019 Oct.
Article in English | MEDLINE | ID: mdl-31352691

ABSTRACT

A new, rapid, and efficient microextraction technique named vortex-assisted natural deep eutectic solvent microextraction has been developed for the preconcentration and determination of orthophosphate in real water samples. The method is based on the formation of the phosphomolybdenium blue complex followed by proposed microextraction procedure and subsequent spectrophotometric determination in a microcell. Screening study for the optimal composition of natural deep eutectic solvent was initially performed with different solvents, including choline chloride as hydrogen bond acceptor and different hydrogen bond donors. A ternary mixture of glucose-choline chloride-water was used as the most efficient extraction solvent. Response surface methodology based on the central composite design was used to optimize experimental parameters. Under optimal conditions, the calibration graph for orthophosphate determination was linear over the range of 2.0-80.0 µg/L (correlation coefficient of 0.9971) with a detection limit of 0.2 µg/L. The repeatability, reproducibility, and relative error values of the method were below 7%, indicating acceptable precision and accuracy. This approach, using natural deep eutectic solvent as an eco-friendly solvent with high solubilization power and vortex mixing as an alternative energy source, represents a promising choice for a green separation and preconcentration methodology for determination of orthophosphate in real water samples.

17.
Article in English | MEDLINE | ID: mdl-29990264

ABSTRACT

Association mapping of genetic diseases has attracted extensive research interest during the recent years. However, most of the methodologies introduced so far suffer from spurious inference of the associated sites due to population inhomogeneities. In this paper, we introduce a statistical framework to compensate for this shortcoming by equipping the current methodologies with a state-of-the-art clustering algorithm being widely used in population genetics applications. The proposed framework jointly infers the disease-associated factors and the hidden population structures. In this regard, a Markov Chain-Monte Carlo (MCMC) procedure has been employed to assess the posterior probability distribution of the model parameters. We have implemented our proposed framework on a software package whose performance is extensively evaluated on a number of synthetic datasets, and compared to some of the well-known existing methods such as STRUCTURE. It has been shown that in extreme scenarios, up to $10-15$10-15 percent of improvement in the inference accuracy is achieved with a moderate increase in computational complexity.


Subject(s)
Computational Biology/methods , Genetics, Population/methods , Genome-Wide Association Study/methods , Models, Statistical , Algorithms , Cluster Analysis , Humans , Markov Chains , Models, Genetic , Monte Carlo Method
18.
J Cancer Res Ther ; 14(3): 490-494, 2018.
Article in English | MEDLINE | ID: mdl-29893304

ABSTRACT

BACKGROUND: Nowadays one of the principal challenges of any country is improving the chronic disease and cancers. One of the most important of cancers is esophageal cancer in Iran. No doubt, esophageal cancer is an outcome of the interaction and combination of different factors. Cancer of the esophagus is one of the most common causes of death in adults (especially women) in Iran, where the incidence of this cancer is among the highest in the world. OBJECTIVE: The main aim of this cross-sectional study was to test the hypothesis that food insecurity could create esophageal cancer among women in Iran (Zanjan Province). METHODS: The method of this paper has been based on the analytical and descriptive research using fuzzy cognitive maps (FCMs) method. The subjects were 580 women aged 40-70 years (150 women have esophageal cancer), and they are selected randomly in the Zanjan Province of Iran. RESULTS: The food insecurity (such as hunger and hidden hunger) in the Zanjan Province, according to the 24 h food-recall questionnaire was 23% and 38%, respectively. Only 39% of the study population was secure in terms of having access to all key nutrients. The accuracy of the questionnaire for screening for hunger in the population was 88.78%, respectively, and the corresponding value for hidden hunger was 83.4%. The average value of esophageal cancer predicted using fuzzy cognitive maps is equal to 75.43% (for 36 months). CONCLUSION: Our findings showed an association of food insecurity and body mass index (BMI) in the study population. Food insecurity increased the rate of underweight and decreased the rates of overweight and obesity.


Subject(s)
Esophageal Neoplasms/epidemiology , Food Supply , Obesity/epidemiology , Adult , Aged , Body Mass Index , Esophageal Neoplasms/physiopathology , Female , Humans , Hunger , Iran/epidemiology , Middle Aged , Obesity/physiopathology , Socioeconomic Factors , Surveys and Questionnaires
19.
Am J Med ; 131(9): 1003-1009, 2018 09.
Article in English | MEDLINE | ID: mdl-29729244

ABSTRACT

Billions of dollars have been spent over the past 25 years on developing new therapies for the prevention/treatment of adverse cardiac events related to atherosclerotic cardiovascular disease. Although some therapies have been lifesaving, several mega-randomized studies have shown only a <2% absolute reduction in adverse events with a large residual event rate. Is all this money well spent? Atherosclerosis develops decades before an adverse event, and the trials previously alluded to have nearly always been applied to secondary prevention, decades after disease initiation. Will earlier intervention result in a lower incidence of events? Individuals with an absence of the usual cardiac risk factors have a lifelong low incidence of events. Early initiation of strategies against the common cardiovascular risk factors in primary or primordial prevention will lower the incidence of adverse events, although many groups have not been well studied, including individuals younger than 40 years of age. New strategies are required to realize a radical reduction in events, and this article proposes new methods of prevention/treatment for coronary artery disease complications.


Subject(s)
Cardiovascular Diseases/prevention & control , Coronary Artery Disease/complications , Antihypertensive Agents/therapeutic use , Cholesterol/blood , Coronary Artery Disease/prevention & control , Diabetes Complications/prevention & control , Health Policy , Humans , Hydroxymethylglutaryl-CoA Reductase Inhibitors/therapeutic use , Hypertension/drug therapy , Platelet Aggregation Inhibitors/therapeutic use , Practice Guidelines as Topic , Primary Prevention , Risk Assessment , Risk Factors , Smoking/adverse effects
20.
Neural Netw ; 98: 87-101, 2018 Feb.
Article in English | MEDLINE | ID: mdl-29223012

ABSTRACT

The Support Vector Machine (SVM) is a supervised learning algorithm to analyze data and recognize patterns. The standard SVM suffers from some limitations in nonlinear classification problems. To tackle these limitations, the nonlinear form of the SVM poses a modified machine based on the kernel functions or other nonlinear feature mappings obviating the mentioned imperfection. However, choosing an efficient kernel or feature mapping function is strongly dependent on data structure. Thus, a flexible feature mapping can be confidently applied in different types of data structures without challenging a kernel selection and its tuning. This paper introduces a new flexible feature mapping approach based on the Dirichlet distribution in order to develop an efficient SVM for nonlinear data structures. To determine the parameters of the Dirichlet mapping, a tuning technique is employed based on the maximum likelihood estimation and Newton's optimization method. The numerical results illustrate the superiority of the proposed machine in terms of the accuracy and relative error rate measures in comparison to the traditional ones.


Subject(s)
Support Vector Machine , Pattern Recognition, Automated/methods
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