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Current status and recent advances on the use of ultrasonography in pediatric rheumatic diseases

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World Journal of Pediatrics 2020年第1期16卷 52-59页

作者： Li-Xia Zou Mei-Ping Lu Lawrence kwok leung Jung Department of Rheumatology Immunology and Allergy Children's HospitalZhejiang University School of Medicine57 Zhugan LaneHangzhou 310003China Division of Rheumatology Children's National Medical Center in Washington D.C.111 Michigan Avenue NWWashingtonD.C.20010USA

Background Ultrasonography has become a useful tool in the clinical rheumatology settings in the last two decades,but its use has only recently been explored by pediatric *** aim of this article is to review the literature on the current status and recent advances on the use of ultrasound in pediatric rheumatic *** sources We have retrieved and reviewed the relevant articles from MEDLINE/PubMed databases published so far,on the applications of ultrasound in juvenile idiopathic arthritis(JIA),systemic lupus erythematosus,dermatomyositis,enthesitis,Sjogren's syndrome,and other rheumatic *** addition,articles on novel ultrasound imaging technology of potential use in pediatric rheumatology are also *** In JIA,ultrasound can be used to detect subclinical synovitis,to improve the classification of patients in JIA subtypes,to capture early articular damage,to monitor treatment response,and to guide intraarticular *** is also considered useful in other rheumatic disorders for the evaluation of musculoskeletal symptoms,assessment of parotid gland pathology,and measurement of skin thickness and *** ultrasound techniques developed to augment the functionality of ultrasonography may also be applicable in pediatric rheumatic *** Ultrasound shows great promise in the assessment and management of children with rheumatologic ***,standardization and validation of ultrasound in healthy children and in patients with rheumatic diseases are still needed.

关键词： Dermatomyositis Juvenile arthritis Lupus Pediatric rheumatic diseases Sonoelastography Ultrasound

Risk of stroke after acute myocardial infarction among Chinese

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Chinese Medical Journal 2001年第2期114卷 98-99页

作者： Ping-WingNG Wai-KwongCHAN Patrick kwok-leung K WAN Dept. of Medicine and Geriatrics United Christian Hospital Hong Kong Hong Kong Dept. of Medicine and Geriatrics United Christian Hospital 130 Hip Wo Street Kwun Tong Kowloon Hong Kong

Following an acute myocardial infarction (AMI), patients have an increased risk of stroke. Estimates of risk are mainly derived from AMI treatment trials or secondary prevention studies. The reported incidence of stroke in Caucasians in the early phase after AMI ranged from 0.5% to 2.5%.1-3 Similar assessment of risk in the Chinese population is lacking. As thrombolytic therapy becomes standard treatment for AMI, there is concern that there may be an increase in haemorrhagic stroke complicating AMI treatment, especially since haemorrhagic stroke is more common in Asian populations.

关键词： TERM

Monitoring interannual dynamics of desertification in Minqin County,China,using dense Landsat time series

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International Journal of Digital Earth 2020年第8期13卷 886-898页

作者： Xiaolin Zhu kwok Huen leung Wing Sze Li Lek Kin Cheung The Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenPeople’s Republic of China

Minqin County in northwestern China is highly affected by *** have been initiated in recent decades to combat desertification in *** assess the effectiveness of these campaigns,this study used a dense Landsat time series from 1987 to 2017 to investigate the interannual dynamics of vegetation coverage and greenness over the past 31 ***,this study applied an advanced technology to reconstruct a high-quality Landsat annual time ***,one image in the vegetation-peak season was selected as the base image in each year,and then problematic pixels were interpolated by the neighborhood similar pixel interpolator using ancillary images in the same ***,the land cover map and the enhanced vegetation index(EVI)were derived from all reconstructed ***,the change of vegetation coverage and EVI values over the 31 years were *** results show that the total vegetation coverage and greenness increased during the 31 *** this change trend to other factors suggests that vegetation in Minqin County is highly affected by agriculture and groundwater supply rather than by *** mitigate desertification in a sustainable way,agriculture should be well managed to avoid overconsumption of natural resources such as underground water.

关键词： Minqin County desertification agriculture Landsat time series vegetation cover

Aluminum-air battery with cotton substrate:Controlling the discharge capacity by electrolyte pre-deposition

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Green Energy & Environment 2023年第3期8卷 757-766页

作者： Wending Pan Yifei Wang Holly Y.H.kwok Dennis Y.C.leung Department of Mechanical Engineering The University of Hong KongHong KongChina

Conventional Al-air battery has many disadvantages for miniwatt applications,such as the complex water management,bulky electrolyte storage and potential leakage ***,the self-corrosion of Al anode continues even when the electrolyte flow is stopped,leading to great Al *** tackle these issues,an innovative cotton-based aluminum-air battery is developed in this *** of flowing alkaline solution,cotton substrate pre-deposited with solid alkaline is used,together with a small water reservoir to continuously wet the cotton and dissolve the alkaline *** this manner,the battery can be mechanically recharged by replacing the cotton substrate and refilling the water reservoir,while the thick aluminum anode can be reused for tens of times until complete *** cotton substrate shows excellent ability for the storage and transportation of alkaline electrolyte,leading to a high peak power density of 73 mW cm^(-2) and a high specific energy of 930 mW h g^(-1).Moreover,the battery discharge capacity is found to be linear to the loading of pre-deposited alkaline,so that it can be precisely controlled according to the mission profile to avoid Al ***,a two-cell battery pack with common water reservoir is developed,which can provide a voltage of 2.7 V and a power output of 223.8 *** further scaling-up and stacking,this cotton-based Al-air battery system with low cost and high energy density is very promising for recharging miniwatt electronics in the outdoor environment.

关键词： Al-air battery Cotton-based Electrolyte pre-deposition Capacity control Miniwatt electronics

Modulatory Effects and Action Mechanisms of Tryptanthrin on Murine Myeloid Leukemia Cells

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Cellular & Molecular Immunology 2009年第5期6卷 335-342页

作者： Hoi-Ling Chan Hon-Yan Yip Nai-Ki Mak kwok-Nam leung Department of Biochemistry The Chinese University of Hong Kong Shatin HKSAR China Department of Food and Nutritional SciencesProgramme The Chinese University of Hong Kong Shatin HKSAR China Department of Biology Hong Kong Baptist University Kowloon TongHKSAR China Department of Biochemistry and Food and Nutritional Sciences Programme The Chinese University of Hong Kong Shatin HKSAR China

Leukemia is the disorder of hematopoietic cell development and is characterized by an uncoupling of cell proliferation and differentiation. There is a pressing need for the development of novel tactics for leukemia therapy as conventional treatments often have severe adverse side effects. Tryptanthrin （6,12-dihydro-6,12-dioxoindolo- （2,1-b）-quinazoline） is a naturally-occurring, weakly basic alkaloid isolated from the dried roots of medicinal indigo plants （Ban-Lan-Gen）. It has been reported to have various biological and pharmacological activities, including anti-microbial, anti-inflammatory, immunomodulatory and anti-tumor effects. However, its modulatory effects and action mechanisms on myeloid cells remain poorly understood. In this study, tryptanthrin was shown to suppress the proliferation of the murine myeloid leukemia WEHI-3B JCS cells in a dose- and time-dependent manner. It also significantly reduced the growth of WEHI-3B JCS cells in vivo in syngeneic BALB/c mice. However, it exhibited no significant direct cytotoxicity on normal murine peritoneal macrophages. Flow cytometric analysis showed an obvious cell cycle arrest of the tryptanthrin-treated WEHI-3B JCS cells at the G0/G1 phase. The expression of cyclin D2, D3, Cdk 2, 4 and 6 genes in WEHI-3B JCS cells was found to be down-regulated at 24 h as measured by RT-PCR. Morphological and functional studies revealed that tryptanthrin could induce differentiation in WEHI-3B JCS cells, as shown by the increases in vacuolation, cellular granularity and NBT-reducing activity in tryptanthrin-treated cells. Collectively, our findings suggest that tryptanthrin might exert its anti-tumor effect on the murine myelomonocytic leukemia WEHI-3B JCS cells by causing cell cycle arrest and by triggering cell differentiation.

关键词： Ban-Lan-Gen tryptanthrin myeloid leukemia cell differentiation

Magnetic activity of the spotted dwarf AP149 in the α Persei open cluster

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Research in Astronomy and Astrophysics 2010年第3期10卷 253-265页

作者： Xiang-Song Fang Sheng-Hong Gu Sze-leung Cheung Ho-Keung Hui Chi-Tai kwok Kam-Cheung leung National Astronomical Observatories / Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Ho Koon Nature Education cum Astronomical Centre Sik Sik Yuen Hong Kong China Hong Kong Astronomical Society Hong Kong China

The simultaneous photometric and spectroscopic observations of the spotted G dwarf AP149 in the young open cluster α Persei are analyzed here. We reconstruct the observed light curves with a two-starspot model by means of a light curve modeling technique, and find that the active regions shift oppositely along longitude on a time scale of one day. Combining with the observational data obtained by other groups, we discuss the evolution of spotted regions in the photosphere, and find that its starspots evolve not only on a short time scale but also on a long time scale. The pure chromospheric emissions for Ca IIHK and Hβ lines are derived by using the spectral subtraction technique. The variation of Ca IIHK lines＇ excess emission is spatially correlated to the starspot regions. There is no clear rotational modulation for the Hβ line＇s excess emission, probably due to the contamination of prominence emission.

关键词： stars: activity -- stars: late-type -- stars: spots -- stars: individual AP149

Low DHEAS levels are associated with depressive symptoms in elderly Chinese men： results from a large study

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Asian Journal of Andrology 2011年第6期13卷 898-902页

作者： Samuel YS Wong Jason C leung Timothy kwok Claes Ohlsson Liesbeth Vandenput Ping C leung Jean Woo School of Public Health and Primary Care School of Public Health The Chinese University of Hong Kong Hong Kong China jockey Club Centre for Osteoporosis Care and Control The Chinese University of Hong Kong Hong Kong China Department of Medicine and Therapeutics The Chinese University of Hong Kong Hong Kong China Center for Bone Research Department of Internal Medicine University of Gothenburg Gothenburg SE-413 45 Sweden Division of Geriatrics Department of Medicine and Therapeutics The Chinese University of Hong Kong Hong Kong China

This study investigated the association between depressive symptoms in elderly Chinese men and the total testosterone, dehydroepiandrosterone （DHEA）, DHEA sulphate （DHEAS）, oestradiol and sex hormone-binding globulin （SHBG） levels, and the free androgen index. Cross-sectional data from 1147 community-dwelling elderly men, aged 65 and older, were used. Depressive symptoms were measured using the Chinese Geriatric Depression Scale （GDS）. Total testosterone, free testosterone, DHEA, DHEAS, total oestradiol, the free androgen index and SHBG levels were assessed. DHEA was significantly associated with GDS score, and there was a trend towards DHEAS association, but this was not significant （p=-0. 110, P=0.015; p=-0.074, P=0.055）. However, no association was seen between depressive symptoms and total testosterone levels, free testosterone levels, oestradiol levels or SHBG levels. In terms of the presence of clinically relevant depressive symptoms, there were no statistically significant differences between patients in the lowest quartile of sex steroid hormone levels and those in other quartiles of sex steroid hormone levels. Similarly to Western studies, our study shows that DHEA and DHEAS levels are associated with depressive symptoms.

关键词： Chinese dehydroepiandrosterone depression elderly men testosterone

Cumulus Cells and their Associations with Immune Functions

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Reproductive and Developmental Medicine 2018年第1期2卷 59-63页

作者： Ping Xia Clement leung-kwok Chan Department of Gynecology and Obstetrics Johns Hopkins University of MedicineMaryland 21093USA Women’s Health and Reproductive Medicine Centre Hong KongChina

The recent progress in the association of cumulus cells with immune functions is a largely ignored area. With over 350 million new sexually transmitted infections occurring annually in adults of reproductive age, we feel the need to explore more about how the cumulus cells defend themselves and protect the oocytes during the development through the ovulation period. Application of assisted reproductive technologies allows scientists to study and better understand cumulus cells. There are still many immune factors to be taken into consideration to optimize the oocyte quality besides ovarian stimulations. The objective of this review is to summarize the key elements of cumulus cells and their association with the immune function.

关键词： Cumulus Cells Follicles Immune Function

Quantitative and qualitative subgenomic RNA profiles of SARS-CoV-2 in respiratory samples: A comparison between Omicron BA.2 and non-VOC-D614G

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Virologica Sinica 2024年第2期39卷 218-227页

作者： Zigui Chen Rita Way Yin Ng Grace Lui Lowell Ling Agnes S.Y.leung Chit Chow Siaw Shi Boon Wendy C.S.Ho Maggie Haitian Wang Renee Wan Yi Chan Albert Martin Li David Shu Cheong Hui Paul Kay Sheung Chan Department of Microbiology Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Medicine and Therapeutics Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Anaesthesia and Intensive Care Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Paediatrics Faculty of MedicineThe Chinese University of Hong KongHong KongChina Department of Anatomical and Cellular Pathology Faculty of MedicineThe Chinese University of Hong KongHong KongChina Jockey Club School of Public Health and Primary Care Faculty of MedicineThe Chinese University of Hong KongHong KongChina Stanley Ho Centre for Emerging Infectious Diseases Faculty of MedicineThe Chinese University of Hong KongHong KongChina

The SARS-CoV-2 Omicron variants are notorious for their transmissibility,but little is known about their subgenomic RNA(sgRNA)*** study applied RNA-seq to delineate the quantitative and qualitative profiles of canonical sgRNA of 118 respiratory samples collected from patients infected with Omicron BA.2 and compared with 338 patients infected with non-variant of concern(non-VOC)-D614G.A unique characteristic profile depicted by the relative abundance of 9 canonical sgRNAs was reproduced by both BA.2 and non-VOCD614G regardless of host gender,age and presence of ***,such profile was lost in samples with low viral load,suggesting a potential application of sgRNA pattern to indicate viral activity of individual patient at a specific time point.A characteristic qualitative profile of canonical sgRNAs was also reproduced by both BA.2 and *** presence of a full set of canonical sgRNAs carried a coherent correlation with crude viral load(AUC¼0.91,95%CI 0.88–0.94),and sgRNA ORF7b was identified to be the best surrogate marker allowing feasible routine application in characterizing the infection status of individual *** potentials in using sgRNA as a target for vaccine and antiviral development are worth pursuing.

关键词： Coronavirus SARS-CoV-2 Omicron BA.2 Non-VOC-D614G RNA-seq Subgenomic RNA(sgRNA)