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Identification of a human group C rotavirus in Malaysia

Rasool NB, Hamzah M, Jegathesan M, Wong YH, Qian Y, Green KY

J Med Virol, 1994 Jul;43(3):209-11.
PMID: 7931180

Stool specimens from 334 infants and young children hospitalized with diarrhea in the General Hospital, Kuala Lumpur, Malaysia between August and November, 1987 were analyzed for the presence of rotavirus double-stranded (ds) RNA by polyacrylamide gel electrophoresis. Of the 334 specimens analyzed, 32 (9.6%) were positive for rotavirus RNA. One specimen (designated G147) exhibited a ds RNA electropherotype profile characteristic of Group C rotavirus and was selected for further characterization. In Northern blot hybridization studies, the gene 5 segment of strain G147 hybridized with a cDNA probe generated from the cloned gene 5 (which encodes the VP6 inner capsid protein that is group specific) of porcine Group C rotavirus strain Cowden, confirming the classification of strain G147 in Group C. The association of Group C rotavirus with diarrheal illness in Malaysia is consistent with earlier studies that suggest a global distribution of this virus and supports the need for additional epidemiologic studies.
Preparation and characterization of curdlan/nanocellulose blended film and its application to chilled meat preservation

Qian Y, Bian L, Wang K, Chia WY, Khoo KS, Zhang C, et al.

Chemosphere, 2021 Mar;266:128948.
PMID: 33220979 DOI: 10.1016/j.chemosphere.2020.128948

In this study, to improve the mechanical and thermal properties of curdlan film, a curdlan/nanocellulose (NC) blended film was prepared and characterized for the first time. NC was successfully prepared from microcrystalline cellulose (MCC) with NaOH/urea treatment. The particle size of NC was observed to be 70-140 nm by cryo-electron microscope (cryo-EM). The blended film was prepared by adding the NC to curdlan solution. The tensile strength (TS) of the blended film reached the maximum value of 38.6 MPa, and the elongation at break (EB) was 40%. The DSC curve showed that the heat absorption peak of the film was 240 °C, indicating that the blended film has good temperature stability. Additionally, some other film properties were also improved, including gas barrier properties and transparency. Obvious morphological and molecular differences between the blended film and the pure curdlan film were discovered by SEM and FTIR analysis. Finally, the blended film was used for the preservation of chilled meat and extended the storage time of meat to 12 days. These results provided a theoretical basis for future application and development of biodegradable film.
Reference interval establishment of full blood count extended research parameters in the multi-ethnic population of Malaysia

Angeli A, Andrew OS, Qian YZ, Anselm ST, Chang KM, Jameela S, et al.

Med J Malaysia, 2019 12;74(6):534-536.
PMID: 31929481

Haematological cellular structures may be elucidated using automated full blood count (FBC) analysers such as Unicel DxH 800 via cell population data (CPD) analysis. The CPD values are generated by calculating volume, conductivity, and five types of scatter angles of individual cells which would form clusters or populations. This study considered 126 CPD parameter values of 1077 healthy Malaysian adults to develop reference intervals for each CPD parameter. The utility of the CPD reference interval established may range from understanding the normal haematological cellular structures to analysis of distinct cellular features related to the development of haematological disorders and malignancies.
First Report of Leaf Spot Caused by Nigrospora oryzae on Dendrobium candidum in China

Wu JB, Zhang CL, Mao PP, Qian YS, Wang HZ

Plant Dis, 2014 Jul;98(7):996.
PMID: 30708927 DOI: 10.1094/PDIS-09-13-1006-PDN

Dendrobium (Dendrobium candidum Wall. ex Lindl.) is a perennial herb in the Orchidaceae family. It has been used as traditional medicinal plant in China, Malaysia, Laos, and Thailand (2). Fungal disease is one of the most important factors affecting the development of Dendrobium production. During summer 2012, chocolate brown spots were observed on leaves of 2-year-old Dendrobium seedlings in a greenhouse in Hangzhou, Zhejiang Province, China, situated at 30.26°N and 120.19°E. Approximately 80% of the plants in each greenhouse were symptomatic. Diseased leaves exhibited irregular, chocolate brown, and necrotic lesions with a chlorotic halo, reaching 0.8 to 3.2 cm in diameter. Affected leaves began to senesce and withered in autumn, and all leaves of diseased plants fell off in the following spring. Symptomatic leaf tissues were cut into small pieces (4 to 5 mm long), surface-sterilized (immersed in 75% ethanol for 30 s, and then 1% sodium hypochlorite for 60 s), rinsed three times in sterilized distilled water, and then cultured on potato dextrose agar (PDA) amended with 30 mg/liter of kanamycin sulfate (dissolved in ddH2O). Petri plates were incubated in darkness at 25 ± 0.5°C, and a grey mycelium with a white border developed after 4 days. Fast-growing white mycelia were isolated from symptomatic leaf samples, and the mycelia became gray-brown with the onset of sporulation after 5 days. Conidia were unicellular, black, elliptical, and 11.4 to 14.3 μm (average 13.1 μm) in diameter. Based on these morphological and pathogenic characteristics, the isolates were tentatively identified as Nigrospora oryzae (1). Genomic DNA was extracted from a representative isolate F12-F, and a ~600-bp fragment was amplified and sequenced using the primers ITS1 and ITS4 (4). BLAST analysis showed that F12-F ITS sequence (Accession No. KF516962) had 99% similarity with the ITS sequence of an N. oryzae isolate (JQ863242.1). Healthy Dendrobium seedlings (4 months old) were used in pathogenicity tests under greenhouse conditions. Leaves were inoculated with mycelial plugs (5 mm in diameter) from a 5-day-old culture of strain F12-F, and sterile PDA plugs served as controls. Seedlings were covered with plastic bags for 5 days and maintained at 25 ± 0.5°C and 80 ± 5% relative humidity. Eight seedlings were used in each experiment, which was repeated three times. After 5 days, typical chocolate brown spots and black lesions were observed on inoculated leaves, whereas no symptoms developed on controls, which fulfilled Koch's postulates. This shows that N. oryzae can cause leaf spot of D. candidum. N. oryzae is a known pathogen for several hosts but has not been previously reported on any species of Dendrobium in China (3). To our knowledge, on the basis of literature, this is the first report of leaf spot of D. candidum caused by N. oryzae in China. References: (1) H. J. Hudson. Trans. Br. Mycol. Soc. 46:355, 1963. (2) Q. Jin et al. PLoS One. 8(4):e62352, 2013. (3) P. Sharma et al. J. Phytopathol. 161:439, 2013. (4) T. J. White et al. PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, 1990.
Survivorship Experiences of Allogeneic Hematopoietic Stem Cell Transplantation Survivors: A Qualitative Systematic Review

Ruan J, Cheng H, Liu Q, Xu F, Kwok WYY, Luo D, et al.

Cancer Nurs, 2024 Jul 16.
PMID: 39016254 DOI: 10.1097/NCC.0000000000001383

BACKGROUND: The number of allogeneic hematopoietic stem cell transplantation (allo-HSCT) survivors is increasing globally. Although qualitative studies in this population are reported, clear understanding of how allo-HSCT survivors experience survivorship is lacking.
OBJECTIVE: This study aimed to identify, appraise, and synthesize evidence from qualitative research on survivorship experience among allo-HSCT survivors.
METHODS: A qualitative systematic review was conducted. A literature search of 9 databases and OpenGrey, Google Scholar, and Google was performed from inception to February 2023. Two reviewers independently screened and assessed the eligibility of each study. Descriptive information was extracted from the studies by one reviewer and checked by another. Findings were extracted and analyzed using thematic synthesis.
RESULTS: Seventeen articles were included. Four themes and 12 subthemes regarding allo-HSCT survivors' experiences emerged: (1) recovery as being a longer process than they thought (influenced by long-term physical symptoms, disturbed by survivorship uncertainty); (2) experiencing a restricted survivorship life (shrunken social world, forced dietary limitations, centered around hospitals); (3) suffering from stigma and discrimination (perceived as a burden, seen differently by others, difficulties establishing and maintaining romantic relationships and marriage, limited opportunities in work); and (4) realizing something positive obtained during survivorship (enriched survivorship self-management skills, enhanced personal growth, developed positive relationships).
CONCLUSIONS: The findings reveal the challenges, needs, and growth that allo-HSCT survivors experienced during survivorship. Some understudied areas were identified, which warrant further exploration.
IMPLICATIONS FOR PRACTICE: Targeted survivor-centered care should be provided to allo-HSCT survivors, and interventions to resolve issues experienced during survivorship should be developed.