Stability and Ion Exchangeability of Clinoptilolite

The similar theme related to various kinds of zeolites and clay minerals has so far often been dealt with by many investigators from the standpoint of industry or of pure science. Nevertheless, a considerable part of the data given previously as those of the ion exchangeability or absorbability for the zeolites have been not so much reliable in the severer sense because of ignoring the instability of their inner structure easily convertible with a slight variation of condition, chemical and/or physical treatments and duration of the reaction even though held at a slightly varied states whereas the most part of their frameworks or the skeletons of so-called channel structure constructed of several-membered rings are seemingly remained to have not been changed. In view of this, some experiments as to clinoptilolite easily obtainable at pure state have been carefully carried out and certain conlcusion expected on the basis of presumption has been reached to more or less satisfactory extent

On the Varieties of Heulandite

As the results obtained from x-ray diffraction at the elevated temperatures, fluorescent x-ray analyses and infrared absorption concerning some specimens of zeolite with the ordinary patterns of heuland-ite in case of no treatments and with the similar values for Al : Si ratio in the framework structure construct-ed mainly of Al and Si atoms, though more or less different in the content of alkali and alkaline earth metals, have become considerably clear the transformation of heulandite merely through dehydration as well as the thermal stability of its structure, the effects of mingling of heulandite with clinoptilolite, the presence of four- and six-coordinated Al and difference in the wave number and intensity of infrared absorption

A Note on Occurrence of Zeolites in the Miocene Formation in Shimane Prefecture, Japan

Modes of occurrence of zeolites comprised in some members of the Miocene formation distributing in Shimane Prefecture have been preliminarily inspected and for convenience classified into several types almost regardless of their geneses or stage of formation though with some allusion

Near-optimal stochastic MIMO signal detection with a mixture of t-distribution prior

Multiple-input multiple-output (MIMO) systems will play a crucial role in future wireless communication, but improving their signal detection performance to increase transmission efficiency remains a challenge. To address this issue, we propose extending the discrete signal detection problem in MIMO systems to a continuous one and applying the Hamiltonian Monte Carlo method, an efficient Markov chain Monte Carlo algorithm. In our previous studies, we have used a mixture of normal distributions for the prior distribution. In this study, we propose using a mixture of t-distributions, which further improves detection performance. Based on our theoretical analysis and computer simulations, the proposed method can achieve near-optimal signal detection with polynomial computational complexity. This high-performance and practical MIMO signal detection could contribute to the development of the 6th-generation mobile network.Comment: to be published in the 2023 IEEE Global Communications Conference (GLOBECOM

EPR based Estimation of Radiation-Induced Reactive Oxygen Species

Generation of reactive oxygen species (ROS) is considered as essential trigger of biological effects of ionizing radiations, and may be deeply linked with the radiation quality.Amounts of total oxidation reactions (i.e. oxidative free radical species, •OH and HO2•), H2O2 generations, Oxygen consumptions, and •OH generations induced by X-ray, 20 keV/μm carbon beam, and 80 keV/μm carbon beam were estimated using EPR based techniques.Total oxidation reactions were estimated as 3, 1.3, and 0.66 μmol/L/Gy, amount of H2O2 generations were 0.2, 0.57, and 0.35 μmol/L/Gy, oxygen consumptions were 0.4, 0.39, and 0.15 μmol/L/Gy for X-ray, 20 keV/μm carbon beam, and 80 keV/μm carbon beam, respectively. The ratio of H2O2 generation per oxygen consumption were increased with LET, and were 0.5, 1.46, 2.33 for X-ray, 20 keV/μm carbon beam, and 80 keV/μm carbon beam, respectively. The •OH generations expected to be localized on the track/range of the radiation beam/ray, and both sparse (≈ 3.3 mM) and very dense (> 1.7 M) •OH generations were suggested. Percentage of sparse •OH generation decreased with LET becoming higher.The SFRBM\u27s 23rd Annual Meeting, a joint meeting with the Society for Free Radical Research International (SFRBM/SFRRI 2016

DNA Damage in Rheumatoid Arthritis: An Age-Dependent Increase in the Lipid Peroxidation-Derived DNA Adduct, Heptanone-Etheno-2′-Deoxycytidine

Objective. To evaluate what types of DNA damages are detected in rheumatoid arthritis (RA). Methods. The DNA adducts such as 8-oxo-hydroxy-7,8-dihydro-2′-deoxyguanosine (8-oxo-dG), 1,N6-etheno-2′-deoxyadenosine (εdA), and heptanone-etheno-2′-deoxycytidine (HεdC) in genomic DNAs, derived from whole blood cells from 46 RA patients and 31 healthy controls, were analyzed by high-performance liquid chromatography tandem mass spectrometry, and their levels in RA patients and controls were compared. In addition, correlation between DNA adducts and clinical parameters of RA was analyzed. Results. Compared with controls, the levels of HεdC in RA were significantly higher (P<0.0001) and age dependent (r = 0.43, P < 0.01), while there was no significant difference in 8-oxo-dG and εdA accumulation between RA patients and controls. HεdC levels correlated well with the number of swollen joints (r = 0.57, P < 0.0001) and weakly with the number of tender joints (r = 0.26, P = 0.08) of RA patients, while they did not show a significant association with serological markers such as C-reactive protein and matrix metalloproteinase 3. Conclusion. These findings indicate that HεdC may have some influence on the development of RA and/or its complications

Impact of cystatin C-derived glomerular filtration rate in patients undergoing transcatheter aortic valve implantation

BackgroundChronic kidney disease (CKD) impacts prognosis in patients undergoing transcatheter aortic valve implantation (TAVI). While estimated glomerular filtration rate (eGFR) calculated from serum creatinine [eGFR (creatinine)] is affected by body muscle mass which reflects frailty, eGFR calculated from serum cystatin C [eGFR (cystatin C)] is independent of body composition, resulting in better renal function assessment.MethodsThis study included 390 consecutive patients with symptomatic severe aortic stenosis (AS) who underwent TAVI, and measured cystatin C-based eGFR at discharge. Patients were divided into two groups, with or without CKD estimated with eGFR (cystatin C). The primary endpoint of this study was the 3-year all-cause mortality after TAVI.ResultsThe median patient age was 84 years, and 32.8% patients were men. Multivariate Cox regression analysis indicated that eGFR (cystatin C), diabetes mellitus, and liver disease were independently associated with 3-year all-cause mortality. In the receiver-operating characteristic (ROC) curve, the predictive value of eGFR (cystatin C) was significantly higher than that of eGFR (creatinine). Furthermore, Kaplan–Meier estimates revealed that 3-year all-cause mortality was higher in the CKD (cystatin C) group than that in the non-CKD (cystatin C) group with log-rank p = 0.009. In contrast, there was no significant difference between the CKD (creatinine) and non-CKD (creatinine) groups with log-rank p = 0.94.ConclusionseGFR (cystatin C) was associated with 3-year all-cause mortality in patients who underwent TAVI, and it was superior to eGFR (creatinine) as a prognostic biomarker