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    25 October 2022, Volume 44 Issue 5
    Invited Special Paper
    Chang'e-5 sample “tells” the story of the Moon 
    YANG Wei
    2022, 44(5):  329-338.  doi:10.3969/j.issn.0253-9608.2022.05.002
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    Chang'e-5 mission has achieved China's first sample return from extraterrestrial bodies. It is an important milestone of the Chinese Lunar Exploration Program, opening a new era of lunar scientific research in the country. Chang'e-5 landed in one of the youngest basalt units on the Moon, the northern Oceanus Procellarum. Orbital observation shows that the landing area has unique chemical composition, such as moderate TiO2 and high Th contents. Scientists applied state-of-the-art analytical techniques to study the basalt fragments in the Chang'e-5 soil sample and found that they were formed at about 2 billion years ago, 800 million years later than the latest lunar volcanic activity dated by the Apollo samples and lunar meteorites. The trigger of this young volcanic activity is still unclear. However, two leading mechanisms can be ruled out, KREEP-rich sources providing an additional heat source for mantle melting or water-rich sources lowering melting point. New samples bring new discoveries, and the new discoveries give birth to new theories. The mystery of the long-term volcanic activity on the Moon is still unraveled, and new theories are about to be established. 
    Review Article
    Differentiation of lowland-upland rice and development of water-saving and drought-resistance rice
    LUO Lijun
    2022, 44(5):  339-356.  doi:10.3969/j.issn.0253-9608.2022.03.010
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    The lowland and upland rice are two ecotypes to adapt to contrasting soil water status during the evolution from the wild rice to cultivated rice. The upland rice is domesticated before rice and is long subjected to bidirectional selection on yield potential and drought resistance. The water-saving and drought-resistance rice (WDR) is developed by integrating the both high yield potential and acceptable grain quality as current lowland paddy rice, as well as water-saving and drought-resistance as traditional upland rice. It has higher water use efficiency and stronger drought-resistance, and could be planted in paddy field by dry seeding with aerobic cultivation, and upland rainfed and hillside land. The WDR production can greatly save irrigation water, reduce non-point source pollution and methane emission, and reduce labor inputs.
    Circulating tumor cells and tumor precision medicine
    ZHANG Tianran , GAO Zhengliang , DENG dan
    2022, 44(5):  347-356.  doi:10.3969/j.issn.0253-9608.2022.02.010
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    Circulating tumor cells (CTCs) were first discovered in 1869 but the clinical significance was not well appreciated. Over the past two decades, with rapid progresses in their biology and related technologies CTCs have reemerged as a major biomedical advance with great promises in tumor precision medicine. In this article, we start with introducing CTCs, their related CTC clusters and biology—origination, dissemination through circulation, heterogeneity, and their roles in tumor progression and metastasis. We then continue to detail the technological advances with CTC isolation, purification and characterization based on its biology characteristics. In the end, we discuss the potential clinical applications of CTCs in tumor precision and/or personalized medicine.
    The role of arachidonic acid and its derivatives in the development of pulmonary arterial hypertension#br#
    LI Yong , ZHANG Jian
    2022, 44(5):  357-368.  doi:10.3969/j.issn.0253-9608.2022.02.011
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    Arachidonic acid (AA) is an all cis-5,8,11,14-eicosatetraenoic acid. A variety of arachidonic acid derivatives can be synthesized from AA through cyclooxygenase (COX), lipoxygenase (LOX) and cytochrome P450 (CYP) pathways and play an important role in pathological and physiological vascular remodeling. Pulmonary arterial hypertension (PAH) is a pathological process characterized by augmentation incessantly of pulmonary artery resistance and pulmonary artery pressure, which eventually leads to right heart failure and even death. Pulmonary vasoconstriction, vascular remodeling and vascular embolism are important pathological basis. In this paper, we focused on the role of arachidonic acid and its derivatives in the development of PAH and its underlying mechanism, which provide ideas for the discovery of new drug targets for the treatment of PAH.
    Research progress on the protective mechanism of exercise on aortic aneurysm/dissection
    JIANG Fei , CAO Yuqing , LIN Yanjuan
    2022, 44(5):  369-374.  doi:10.3969/j.issn.0253-9608.2022.02.012
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    Aortic aneurysm/dissection (AAD) is a catastrophic cardiovascular disease with extremely high mortality, and hypertension is the most common underlying disease. The main pathophysiological mechanisms of AAD include inflammatory aggregation, extracellular matrix (ECM) degradation, massive generation of reactive oxygen species (ROS), abnormal proliferation and migration

    of vascular smooth muscle cells (VSMCs), and increased apoptosis resulting in weak aortic structure and function. Exercise is essential for the prevention and treatment of cardiovascular disease, but the implementation of exercise prevention and treatment
    research in patients with AAD is still limited due to concerns that the increase in blood pressure during exercise can lead to rupture
    of the AAD. However, current studies have found that reasonable exercise not only does not increase the risk of AAD expansion and rupture, but also can delay the progression of AAD by regulating the underlying diseases of AAD and antagonizing pathophysiological damage. In this paper, combined with the research in recent years, the protective mechanism of exercise on AAD is reviewed, which provides a broader idea and basis for clinical in-depth exploration of the prevention and treatment of AAD.
    SPECIAL ISSUE FOR SHU 100TH ANNIVERSARY
    Investigation on corrosion behavior of (FeCoNi)86Al7Ti7 high-entropy alloy fabricated by selective laser melting
    LIANG Jian, LI Han, JIA Yandong, WANG Gang
    2022, 44(5):  375-381.  doi:10.3969/j.issn.0253-9608.2022.05.006
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    In this study, the (FeCoNi)86Al7Ti7 high-entropy alloy was prepared by selective laser melting (SLM), and then annealed at 780 °C. Both the as-fabricated and annealed (FeCoNi)86Al7Ti7 high-entropy alloys were placed in 0.5 mol/L H2SO4 solution for electrochemical corrosion experiments to explore the corrosion performance of the high-entropy alloys under acidic environment. The open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and polarization curves of high-entropy alloys were measured by electrochemical workstation. It was found that the self-corrosion potential of annealed (FeCoNi)86Al7Ti7 high entropy alloy was higher, the self-corrosion current density was lower. Meanwhile, the capacitive reactance arc diameter was larger, the impedance value was higher, and the charge transfer resistance was larger in comparation with the as-fabricated alloy. X-ray photoelectron spectroscopy (XPS) was used to analyze the composition and content of the passivation film on the corroded surface. The results show that the oxide species on the corroded surface of the annealed high-entropy alloys are richer and the content is higher, and the stable passivation film is easier to be formed. The results show that annealing at 780 °C can significantly improve the corrosion resistance of (FeCoNi)86Al7Ti7 high entropy alloys. 
    SPECIAL ISSUE FOR HIT 100TH ANNIVERSARY
    Biochip technology and mechanics
    WANG Shouzhi, ZHANG Nenghui, REN Jiusheng
    2022, 44(5):  382-388.  doi:10.3969/j.issn.0253-9608.2022.04.009
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    Biochip is a miniaturized integrated detection and manipulation platform that integrates a large number of biomolecules on solid substrate, which plays an important role in many fields related to biology. This paper presents a brief review on history, technical supports, manipulation steps and existing difficulties for biochips. Several key mechanical problems in biochip technology are emphatically analyzed with a preliminary prospect of this field.
    Progress
    Fetal hemoglobin regeneration for therapy of β-hemoglobinopathies
    ZHAO Feiyan, WU Yuxuan
    2022, 44(5):  389-397.  doi:10.3969/j.issn.0253-9608.2022.03.011
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    β-hemoglobinopathy is the most common genetic disease in the world. The initial treatment strategy is viral vector-mediated gene therapy. Due to the high cost, limited efficacy and potential safety problems, the progress is slow. In recent years, genome editing technology has been a powerful tool for the development of new cures for β-hemoglobinopathy. This article reviewed the latest developments in fetal hemoglobin regeneration strategies for the treatment of β-hemoglobinopathy. The stratergy of disrupting the BCL11A erythroid enhancer is favored due to its safety, effectiveness and higher clinical value. Looking forward to development of gene therapy strategy for β-hemoglobinopathy, it is expected to completely cure the two inherited blood diseases of β-thalassemia and sickle cell anemia. 
    History of Natural Science
    The contributions of Chinese scientists to metallic glass field
    ZHAO Rui, YU Jihao, CHENG Qi, LIU Songling, SUN Boyang, SHEN Peipei, WANG Weihua
    2022, 44(5):  398-410.  doi:10.3969/j.issn.0253-9608.2022.05.001
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     2022 is the international year of glass. Metallic glass is a novel metallic material with long-range atomic disorder and shortrange atomic order, which is a newcomer in glass and metal families and at the cutting edge of research and of current interest and significance in condensed matter physics, materials science and engineering. In the development process, Chinese scientists have great contributions on the science and technology of this field. In this article, we introduce the contributions of Chinese scientists on the development of new metallic glassy systems, related science and applications, and we also predict the role of Chinese scientists in the future of the rapidly moving field.
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