Nonisothermal Decomposition Reaction Kinetics, Specific Heat Capacity, Thermodynamic Properties and Adiabatic Time-to-explosion of 4-Amino-1,2,4-triazole Copper Complex

Ren, Yinghui,Li, Dan,Yi, Jianhua,Zhao, Fengqi,Ma, Haixia,Xu, Kangzhen,Song, Jirong Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.7

4-Amino-1,2,4-triazole copper complex (4-ATzCu) was synthesized, and its thermal behaviors, nonisothermal decomposition reaction kinetics were studied by DSC and TG-DTG techniques. The thermal decomposition reaction kinetic equation was obtained as: $d\alpha$ / dt =$10^{22.01}$ (1-$\alpha$)[-ln(1-$\alpha$)]$^{1/3}$ exp($-2.75\times10^4$ /T). The standard mole specific heat capacity of the complex was determined and the standard molar heat capacity is 305.66 $J{\cdot}mol^{-1}{\cdot}K^{-1}$ at 298.15 K. The entropy of activation $({\Delta}S^{\neq})$, enthalpy of activation $({\Delta}H^{\neq})$, and Gibbs free energy of activation $({\Delta}G^{\neq})$ are calculated as 171.88 $J{\cdot}mol^{-1}{\cdot}K^{-1}$ 225.81 $kJ{\cdot}mol^{-1}$ and 141.18 $kJ{\cdot}mol^{-1}$, and the adiabatic time-to-explosion of the complex was obtained as 389.20 s.

BMAH: A Medical Data Management System Comprising a Mutual Authentication Mechanism Based on Blockchain

Zheng vZhixuan,Li Wei,Lu Kun,Tong Ning,Shah Syed Bilal Hussain,Li Fengqi 한국컴퓨터산업협회 2023 Human-centric Computing and Information Sciences Vol.13 No.-

There is an urgent need to solve the problems surrounding identity verification, the preservation of privacy, anonymity, and reliable data sharing in the medical healthcare industry. Although several schemes have been proposed, there still remain many issues that render the system vulnerable. Therefore, in order to solve the problems mentioned above, this paper proposes a blockchain-based mutual authentication healthcare framework, BMAH. First, the proposed framework is designed to ensure that the operations on medical data of doctors, patients, and third-party non-medical institutions are traceable and tamper-proof through the utilization of blockchain. Second, this paper proposes a mutual authentication scheme including three-step registration and four-step authentication. The authentication scheme is used to authenticate the identities of doctors, patients, and third-party non-medical institutions. In this way, we can establish the foundation of reliable sharing and protect the privacy of participants at the same time. Third, this paper introduces a lightweight proof of work consensus mechanism to determine the validity of a record. Finally, it analyzes the security theoretically and adopts a formal protocol analysis tool to prove the security of the authentication scheme, whose performance is also evaluated, proving that it is secure and effective.

Nonisothermal Decomposition Reaction Kinetics, Specific Heat Capacity, Thermodynamic Properties and Adiabatic Time-to-explosion of 4-Amino-1,2,4-triazole Copper Complex

Yinghui Ren,Dan Li,Jianhua Yi,Fengqi Zhao,Haixia Ma,Kangzhen Xu,Jirong Song 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.7

4-Amino-1,2,4-triazole copper complex (4-ATzCu) was synthesized, and its thermal behaviors, nonisothermal decomposition reaction kinetics were studied by DSC and TG-DTG techniques. The thermal decomposition reaction kinetic equation was obtained as: dα / dt =1022.01 (1−α )[−ln(1−α )]1/3 exp(−2.75×104 /T) . The standard mole specific heat capacity of the complex was determined and the standard molar heat capacity is 305.66 J·mol‒1·K‒1 at 298.15 K. The entropy of activation ( ΔS ≠ ), enthalpy of activation (ΔH ≠), and Gibbs free energy of activation ( ΔG≠) are calculated as 171.88 J·mol‒1·K‒1, 225.81 kJ·mol‒1 and 141.18 kJ·mol‒1, and the adiabatic time-to-explosion of the complex was obtained as 389.20 s.

Impact of enhanced recovery after surgery program for hungry bone syndrome in patients on maintenance hemodialysis undergoing parathyroidectomy for secondary hyperparathyroidism

Ling Wang*,Xiaohong Zhang*,Fengqi Hu,Hai Yuan,Zhao Gao,Li He,Shuang Zou 대한외과학회 2022 Annals of Surgical Treatment and Research(ASRT) Vol.103 No.5

Purpose: Hungry bone syndrome after parathyroidectomy is an important clinical problem in patients on maintenance hemodialysis. We examined the effect of an enhanced recovery after surgery (ERAS) program on the incidence of hungry bone syndrome after parathyroidectomy in this population. Methods: This single-institution, retrospective study analyzed 108 patients on hemodialysis who underwent parathyroidectomy for secondary hyperparathyroidism. Patients were classified into the pre-ERAS (n = 52) and post-ERAS (n = 56) groups. The ERAS program identified high-risk patients and enforced aggressive measures to normalize calcium levels following parathyroidectomy. Results: There was no significant difference in age, sex, body weight, presenting symptoms, preoperative calcium and alkaline phosphatase levels, postoperative intact parathyroid levels, postoperative calcium levels at 1 and 24 hours after parathyroidectomy, and 30-day readmission rates between the groups. The post-ERAS group had significantly higher levels of postoperative calcium at 48 and 72 hours after parathyroidectomy, but a lower incidence of hungry bone syndrome and shorter postoperative length of stay. Patients with hungry bone syndrome had higher preoperative levels of alkaline phosphatase and intact parathyroid, longer postoperative length of stay, and were less likely to have been part of the ERAS program. High preoperative alkaline phosphatase levels and absence of the ERAS program were independent risk factors for hungry bone syndrome after parathyroidectomy. Conclusion: The ERAS program reduced the incidence of hungry bone syndrome and shortened the postoperative length of stay in patients on maintenance hemodialysis who underwent parathyroidectomy for secondary hyperparathyroidism.

Lethal and sublethal effects of dinotefuran on two invasive whiteflies, Bemisia tabaci (Hemiptera: Aleyrodidae)

Cheng Qu,Wei Zhang,Fengqi Li,Guillaume Tetreau,Chen Luo,RanWang 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2

Two invasive whitefly cryptic species, Middle East-Asia Minor 1 (MEAM1) and Mediterranean (MED), are the most invasive and notorious pests on diverse crops and have significantly impacted agricultural production systems globally. This circumstance emphasizes the need for a better approach for controlling these species. In this study, the lethal effect of six insecticides and the sublethal effects of dinotefuran on B. tabaci MEAM1 and MED were examined. Among the six insecticides tested, dinotefuran was the most toxic to both B. tabaci MEAM1 andMED adults with LC50 values of 5.54 mg/L and 6.01mg/L, respectively. After treating adults of the two important specieswith LC25 of 1.70 mg/L (MEAM1) and 2.12 mg/L (MED), the transgenerational effects of dinotefuran on survival, developmental duration, and fecundity of F1 generation of B. tabaciMEAM1 andMEDadultswere observed respectively, which increased the developmental time and decreased survival rates of nymph, pseudopupa and adult. The fecundity of tested femaleswas also reduced markedly. In summary, these results indicate that dinotefuran could be one excellent candidate that may effectively control two invasive whitefly populations.

Molecular cloning, characterization and mRNA expression of a ryanodine receptor gene from whitefly, Bemisia tabaci MED

Wei Zhang,Cheng Qu,ChangqingMu,Fengqi Li,Chen Luo,Jinda Wang,RanWang 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1

The Bemisia tabaci (Gennadius) cryptic species complex comprises very destructive insect pests for agricultural cropsworldwide. In China, the B. tabaciMED species (also known as biotype ‘Q’), has supplanted theMEAM1 species (biotype ‘B’) which is threatening agricultural production around the country. The new anthranilic diamide insecticide, cyantraniliprole, provides one novel step for themanagement of B. tabaci and the development of resistance to other insecticides. Ryanodine receptors of insect are the main target sites of the diamide insecticides. In this study, the full-length cDNA of a ryanodine receptor gene (BtRyR) was cloned and characterized from B. tabaci MED. The cDNAs of BtRyR contain a 15,369-bp open reading frame with encoding 5122 amino acids (GenBank ID: KY244091). BtRyR shares 76–83% identity with other insect RyR isoforms and 42–45% identity with vertebrate RyR isoforms. Spatial and temporal expression of BtRyR mRNA was at the highest relative level in pseudopupae and head, and at the lowest expression level in egg and abdomen. The expression levels of whole body BtRyR mRNAwere increased remarkably after insecticide-treatments of adults with cyantraniliprole at 0.01 to 1 mg/l. This structural and expression data on BtRyR provides the basis for further understanding the selective action of cyantraniliprole.

Computational Screening of Nanoporous Materials for Hexane and Heptane Isomer Separation

Chung, Yongchul G.,Bai, Peng,Haranczyk, Maciej,Leperi, Karson T.,Li, Peng,Zhang, Hongda,Wang, Timothy C.,Duerinck, Tim,You, Fengqi,Hupp, Joseph T.,Farha, Omar K.,Siepmann, J. Ilja,Snurr, Randall Q. American Chemical Society 2017 Chemistry of materials Vol.29 No.15

<P>Computational high-throughput screening was carried out to assess a large number of-experimentally reported metal-organic frameworks (MOFs) and zeolites for their utility in hexane isomer separation. Through the work, we identified many MOFs and zeolites with high selectivity (SL+M > 10) for the group of n-hexane, 2-methylpentane, and 3-methylpentane (linear and monobranched isomers) versus 2,2-dimethylbutane and 2,3-dimethylbutane (dibranched isomers). This group of selective sorbents includes VICDOC (Fe-2(BDP)(3)), a MOF with triangular pores that is known to exhibit high isomer selectivity and capacity. For three of these structures, the adsorption isotherms for a 10-component mixture of hexane and heptane isomers were calculated. Subsequent simulations of column breakthrough curves showed that the DEYVUA MOF exhibits a longer process cycle time than VICDOC MOF or MRE zeolite, which are previously reported, high-performing materials, illustrating the importance of capacity in designing MOFs for practical applications. Among the identified candidates, we synthesized and characterized a MOF in a new copper form with high predicted adsorbent capacity (q(L+M) > 1.2 mol/L) and moderately high selectivity (SL+M approximate to 10). Finally, we examined the role of pore shape in hexane isomer separations, especially of triangular-shaped pores. We show through the potential energy surface and three-dimensional siting analyses that linear alkanes do not populate the corners of narrow triangular channels and that structures with nontriangular pores can efficiently separate hexane isomers. Detailed thermodynamic analysis illustrates how differences in the free energy of adsorption contribute to shape selective separation in nanoporous materials.</P>