“铟硫得福”——与尿酸的狭路相逢

尿酸是嘌呤在人体内代谢的最终产物,如果人们长期食用嘌呤含量高的食物或者不新鲜的各种肉类,使人体尿酸失衡,就容易导致血液中尿酸过高,引发一系列健康问题。本实验制备了一种新型Cd2In2S5纳米晶,将Cd2In2S5纳米晶与丝网印刷碳柔性电极结合,所得电极可用于尿酸检测。可通过检测尿酸含量来监测人体健康状况以及判断肉类新鲜程度。本实验创新性的将神奇的纳米材料走向市场,让中小学生、大学生、社会人群都能明白尿酸检测原理。实验所用材料便宜易得,操作简单,可实现尿酸的居家检测。

Facile One-Pot Synthesis of ZSM-5 Aggregates with Interand Intra-Crystalline Mesopores for Methanol to Gasoline Conversion

ZSM-5 aggregates consisting of superfine and hierarchical nanocrystals(combined with micropores and intra-crystalline mesopores) with an average size of 30 nm were prepared through one-pot synthesis with the assistance of anionic polyacrylamide(APAM). The resultant zeolites(AHN-ZSM-5) were characterized by XRD, ICP-OES, SEM, TEM, BET, NH_3-TPD, Py-IR, and TG analyses and evaluated in the methanol to gasoline(MTG) reaction. Characterization results show that the hierarchical ZSM-5 aggregates possessed two kinds of mesopores, namely inter-and intra-crystalline mesopores. The amount of APAM considerably influenced the mesoporosity and textural properties of AHN-ZSM-5 zeolites. With the addition of APAM in the synthesis, the AHN-ZSM-5 zeolites exhibited large mesopore volume, large external surface area, and appropriate acidity. When applied in the MTG reaction, AHN-ZSM-5 demonstrated a catalytic lifetime that was 1.6 times longer than that of conventional ZSM-5 synthesized in the absence of APAM.

Performance of Methanol-to-Olefins Catalytic Reactions by the Addition of PEG in the Synthesis of SAPO-34

SAPO-34, a silicoaluminophosphate zeolite, has been synthesized by the hydrothermal method with the addition of different molecular weights of polyethylene glycol(PEG), and has been characterized with XRD, SEM,N_2 adsorption–desorption, FT-IR, and NH_3 temperatureprogrammed desorption(NH_3-TPD). We studied SAPO-34 as a catalyst in the methanol-to-olefins(MTO) reaction, in a fixed-bed reactor. The results show that the chain length of PEG has a great influence on the particle size and morphology of SAPO-34. PEG acts as inhibitor in the crystallization process. With the increase of the chain length of PEG used in the synthesis, from a relative molecular weight of 400-6000, the morphology of SAPO-34 changes gradually from cubic to nanoplate-like and then changes to cubic again. The particle size decreases markedly at first and then increases to some extent. The catalytic stability in the MTO reaction also increases first and then decreases, with all the catalysts having almost the same selectivity to olefins. When the sample is synthesized with PEG800, the particles become nanoplate-like with a thickness of 46 nm on average, and the catalytic stability is appreciably prolonged, which is attributed to the shorter diffusion paths of the reactants in the zeolite.

Beam tracking method based on reconfigurable intelligent surface for obstructed communication

This paper proposes a new reconfigurable intelligent surface based three-dimensional beam tracking method to solve the beam tracking problems for the unmanned aerial vehicle with obstacles in communication channels.The proposed beam tracking method can not only regulate the reconfigurable intelligent surfaces to achieve the beam tracking of the obstructed communications,but also optimize the transmission efficiency of the communication.Firstly,a reconfigurable intelligent surface is proposed,which can correlate the transmission signals by adjusting the phaseshift matrix.Meanwhile,a new communication channel is constructed according to the reconfigurable intelligent surface,which consists of two parts.The first one is the channel between the unmanned aerial vehicle and the reconfigurable intelligent surface,the other is the channel between the reconfigurable intelligent surface and the ground base station.Note that the transmission performance of the communications can be optimized by adjusting the phase shift of each uniform linear array on the reconfigurable intelligent surface.Then,a new beam tracking method for the unmanned aerial vehicle with obstructed communications is proposed on the basis of the reconfigurable intelligent surface.By proposing the mixed genetic algorithm,the estimation accuracy of the azimuth and elevation angles is improved to enhance the performance of the beam tracking.Finally,the simulations are provided to verify the effectiveness of the proposed three-dimensional beam tracking method with reconfigurable intelligent surface.

Ferroptosis and its emerging roles in acute pancreatitis

Acute pancreatitis(AP)is a common and potentially life-threatening pancreatic inflammatory disease.Although it is usually self-limiting,up to 20%of patients will develop into severe AP.It may lead to systemic inflammatory response syndrome and multiple organ dysfunction,affecting the lungs,kidneys,liver,heart,etc.Surviving patients usually have sequelae of varying degrees,such as chronic hyperglycemia after AP(CHAP),pancreatic exocrine insufficiency,and chronic pancreatitis.Lacking specific target treatments is the main reason for high mortality and morbidity,which means that more research on the pathogenesis of AP is needed.Ferroptosis is a newly discovered regulated cell death(RCD),originally described in cancer cells,involving the accumulation of iron and the depletion of plasma membrane polyunsaturated fatty acids,and a caspase-independent RCD.It is closely related to neurological diseases,myocardial infarction,ischemia/reperfusion injury,cancer,etc.Research in the past years has also found the effects of ferroptosis in AP,pancreatic cancer,and AP complications,such as acute lung injury and acute kidney injury.This article reviews the research progress of ferroptosis and its association with the pathophysiological mechanisms of AP,trying to provide new insight into the pathogenesis and treatment of AP,facilitating the development of better-targeted drugs.