The physicochemical transformations and electromagnetic properties of a composite based on the dust of electrical arc steel-making furnaces and a carbon-containing material (hydrolysis lignin) have ...been studied. The complex dielectric permittivity of the studied material was measured by the resonator method during heating to 800°C. At room temperature, the effective values of the magnetic permeability and loss of the composite mixture were calculated by solving the Bruggeman equation according to the effective medium theory. The magnetic permeability during heating was found by orthogonal regression. The numerical model of heating a dense packing from several layers of studied material grains was constructed by the finite element method with consideration of the real properties and physicochemical transformations.
To investigate the value of serum and bronchoalveolar lavage fluid (BALF) chitinase-3-like-1 protein (YKL-40) in the diagnosis of anti-melanoma differentiation-associated gene 5 (MDA5)-positive ...dermatomyositis (DM) patients complicated with serious pulmonary injury, including rapidly progressive interstitial lung disease (RP-ILD) and pulmonary infection.
Anti-MDA5 antibodies positive patients with DM who were hospitalized in the Department of Rheumatology of China-Japan Friendship Hospital from 2013 to 2018 were involved in this study. Demographic information, clinical, laboratory and imaging data were retrospectively collected. ELISA was used to detect the serum and BALF levels of YKL-40. The receiver operating characteristic (ROC) curve was drawn, and the area under ROC curve (AUC) was used to evaluate the diagnostic value of serum YKL-40 for pulmonary injury.Interstitial lung disease (ILD) was confirmed by chest high-resolution CT (HRCT). RP-ILD was defined as progressive respiratory symptoms such as dyspn
The neurotransmitter GABA mediates the majority of rapid inhibition in the CNS. Inhibition can occur via the conventional mechanism, the transient activation of subsynaptic GABA A receptors (GABA A ...-Rs), or via continuous activation of high-affinity receptors by low concentrations of ambient GABA, leading to “tonic” inhibition that can control levels of excitability and network activity. The GABA A -R α4 subunit is expressed at high levels in the dentate gyrus and thalamus and is suspected to contribute to extrasynaptic GABA A -R-mediated tonic inhibition. Mice were engineered to lack the α4 subunit by targeted disruption of the Gabra4 gene. α4 Subunit knockout mice are viable, breed normally, and are superficially indistinguishable from WT mice. In electrophysiological recordings, these mice show a lack of tonic inhibition in dentate granule cells and thalamic relay neurons. Behaviorally, knockout mice are insensitive to the ataxic, sedative, and analgesic effects of the novel hypnotic drug, gaboxadol. These data demonstrate that tonic inhibition in dentate granule cells and thalamic relay neurons is mediated by extrasynaptic GABA A -Rs containing the α4 subunit and that gaboxadol achieves its effects via the activation of this GABA A -R subtype. tonic inhibition THIP analgesia sedative/hypnotic
Genetic diversity of a set of 71 wheat accessions, including 53 biotype 2 Russian wheat aphid (RWA2)-resistant landraces and 18 RWA2 susceptible accessions, was assessed by examining molecular ...variation at multiple microsatellite (SSR) loci. Fifty-one wheat SSR primer pairs were used, 81 SSR loci were determined, and 545 SSR alleles were detected. These SSR loci covered all the three genomes, 21 chromosomes, and at least 41 of the 42 chromosome arms. Diversity values averaged over SSR loci were high with mean number of SSR alleles/locus = 6.7, mean Shannon's index (H) = 1.291, and mean Nei's gene diversity (He) = 0.609. The three wheat genomes ranked as A > D > B and the homoeologous groups ranked as 7 > 3 > 1 > 2 > 6 > 5 > 4 based on the number of alleles per locus. Xgwm136 on chromosome arm 1AS is the most polymorphic SSR locus with the largest number of observed and effective alleles and the highest H and He. Among all 2485 pairs of wheat accessions, genetic distance (GD) ranged from 0.054 to 1.933 and averaged 0.9832. A dendrogram based on GD matrix showed that all the wheat accessions could be grouped into distinct clusters. Most of the susceptible cultivars (13/18) were clustered into groups that contains all or mostly susceptible accessions. Most of the U.S. cultivars belong to a group that is distinguishable from all the different RWA2 resistant groups. Diversity analysis was also conducted separately for subgroups containing 53 RWA2-resistant accessions and 18 RWA2-susceptible accessions. Association mapping revealed 28 SSR loci significantly associated with leaf chlorosis, and 8 with leaf rolling. New chromosome regions associated with RWA2 resistance were detected, and indicated existence of new RWA resistance genes located on chromosomes of all other homoeologous groups in addition to the groups 1 and 7 in bread wheat. This information is helpful for development of mapping populations for RWA2 resistance genes from different phylogenetic groups, and for wise utilization of the RWA-resistant germplasm in wheat breeding programs.
Abstract
Recovery of new-energy critical metals including scandium, nickel and cobalt as well as copper and zinc from a neutralization residue produced in laterite hydrometallurgical process has been ...studied. Effect of leaching parameters such as acid consumption, solution pH and temperature has been investigated. It was found that scandium, nickel, cobalt and copper could be recovered at high efficiencies from the residues by selective leaching using sulphuric acid solutions under ambient conditions, while the co-leaching of impurities including iron, aluminium and silicon was low under the optimal conditions. The nickel, cobalt, copper and zinc in the leaching solution could be further concentrated into mixed sulphides and separated from impurities by sulphide precipitation.
Frailty tends to be considered as a major risk for adverse outcomes in older persons, but some important aspects remain matter of debate. OBJECTIVES: The purpose of this paper is to present expert’s ...positions on the main aspects of the frailty syndrome in the older persons. PARTICIPANTS: Workshop organized by International Association of Gerontology and Geriatrics (IAGG), World Health Organization (WHO) and Société Française de Gériatrie et de Gérontologie (SFGG). RESULTS: Frailty is widely recognized as an important risk factor for adverse health outcomes in older persons. This can be of particular value in evaluating non-disabled older persons with chronic diseases but today no operational definition has been established. Nutritional status, mobility, activity, strength, endurance, cognition, and mood have been proposed as markers of frailty. Another approach calculates a multidimensional score ranging from “very fit” to “severely frail,” but it is difficult to apply into the medical practice. Frailty appears to be secondary to multiple conditions using multiple pathways leading to a vulnerability to a stressor. Biological (inflammation, loss of hormones), clinical (sarcopenia, osteoporosis etc.), as well as social factors (isolation, financial situation) are involved in the vulnerability process. In clinical practice, detection of frailty is of major interest in oncology because of the high prevalence of cancer in older persons and the bad tolerance of the drug therapies. Presence of frailty should also be taken into account in the definition of the cardiovascular risks in the older population. The experts of the workshop have listed the points reached an agreement and those must to be a priority for improving understanding and use of frailty syndrome in practice. CONCLUSION: Frailty in older adults is a syndrome corresponding to a vulnerability to a stressor. Diagnostic tools have been developed but none can integrate at the same time the large spectrum of factors and the simplicity asked by the clinical practice. An agreement with an international common definition is necessary to develop screening and to reduce the morbidity in older persons.
A Mule Cloned from Fetal Cells by Nuclear Transfer Woods, Gordon L.; White, Kenneth L.; Vanderwall, Dirk K. ...
Science (American Association for the Advancement of Science),
08/2003, Letnik:
301, Številka:
5636
Journal Article
Recenzirano
Woods et al discuss the results of a study that cloned mule foal that is a sterile hybrid from fetal cells by nuclear transfer. The results showed the developmental competence of mule somatic cells ...for nuclear transfer and that the reproductive failure of mules is attributed to the odd number of chromosome 7. The study also shows that the nucleus can direct complete embryonic and fetal development.
To evaluate the prevalence of frailty and the associated multimorbidity and functional impairments among community-dwelling middle-aged and elderly people in Taiwan.
a cross-sectional study.
...communities in I-Lan County of Taiwan.
1839 community-dwelling people aged 50 years and older.
None.
Frailty defined by Fried's criteria, Charlson's comorbidity index (CCI), Functional Autonomy Measurement System (SMAF), Center for Epidemiologic Studies Depression Scale (CES-D), Mini-Nutrition Assessment (MNA), Mini-Mental State Examination (MMSE), and Short Form-12 quality of life questionnaire.
Overall, 1839 subjects (mean age: 63.9±9.3 years, 47.5% males) participated in this study and men were more likely to have higher educational level, more smoking and alcohol drinking habit. The prevalence of frailty was 6.8% in this study, while pre-frailty was 40.5% and 53.7% of all participants were robust. Compared to subjects with different frailty status, age, education year, alcohol drinking, hypertension, diabetes mellitus, hyperlipidemia, CCI, walking speed, handgrip strength, score of SMAF, CES-D, MNA, MMSE, quality of life were significantly different between groups (P all< 0.05). Older age, poorer physical function, poorer cognitive function, poorer nutritional status, more depressive symptoms, higher CCI and poorer quality of life were all independently associated with frailty.
Frailty was not simply a geriatric syndrome, but the combination of multiple geriatric syndromes. Further study is needed to evaluate the clinical benefits of intervention programs for community-dwelling middle-aged and older people to reverse frailty and its associated functional impairments.
Abstract Background Association of de novo human leukocyte antigen (HLA) and major histocompatibility complex class I chain-related gene-A (MICA) antibodies and proteinuria with graft survival 5 ...years after renal transplantation. De novo presence of HLA and MICA antibodies after renal transplantation is associated with poor graft survival. Proteinuria after transplantation is also considered a risk factor for premature graft loss. In this study, we investigated the association of de novo HLA and MICA antibodies on proteinuria after renal transplantation and the association of proteinuria and de novo antibodies with graft survival. Methods We enrolled 275 patients without preexisting HLA and MICA antibodies followed for >5 years after renal transplantation. All donor organs were from living-related donors or from an organ donation program. HLA and MICA antibodies were detected by the Luminex method. Patients with proteinuria (>150 mg/d) underwent intermittent 24-hour proteinuria examination. Results The frequencies of de novo HLA and MICA antibody 5 years after transplantation were 25.8% and 12%, respectively. In total, 26.5% of patients had proteinuria at the 5-year follow-up. De novo HLA antibody was associated with increased proteinuria after transplantation (relative risk, 3.12). HLA antibody and proteinuria were both associated with poor 5-year graft survival ( P = .027 and P = .006, respectively). Conclusion De novo HLA and MICA antibodies and proteinuria after renal transplantation are all associated with poor graft survival. De novo HLA antibody is independent risk factor for posttransplant proteinuria, and proteinuria affects the association of de novo antibodies with decreased graft survival after transplantation.
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