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Role of Growth Regulators in the Somatic Organogenesis of Haworthia Inflorescences in Vitro
Yesmin Reshma,Islam MD Mazharul,Hong-Yul Kim,Chang-kil Kim,Ki-Byung Lim 한국원예학회 2020 원예과학기술지 Vol.38 No.3
This study investigated the effect of growth regulators on the somatic organogenesis of Haworthia inflorescences. The inflorescences of five Haworthia cultivars and one species were cultured on 1X and 0.5X MS media with/without growth regulators for organogenesis. Shoot and callus induction was observed for three of the five cultivars, whereas only callus induction was observed for the other two cultivars and one species. Of the two growth regulator-free media used, all explants performed better on ½ fold MS medium than on 1 fold MS medium in terms of shoot and callus induction. Conversely, among the six media supplemented with kinetin and 6-benzylaminopurine (BA), there was no shoot formation; however, a different response in callus formation was observed for H. splendens and ‘White Wolf’. The callus induction of H. splendens was more vigorous than that of ‘White Wolf’. In this study, better organogenesis from young upper parts of the inflorescences was observed. The highest shoot and root multiplication was observed on NAA containing medium, and no root formation was observed on BA containing medium. The highest shoot multiplication (20.8 ± 0.29) was observed for ‘Tiffany × Fertenon B Com’ on 1.4 ㎎·L<SUP>-1</SUP> BA containing medium within 18 weeks, whereas, the highest root induction was observed for Haworthia ‘Natalie’ on medium containing 0.05 ㎎·L<SUP>-1</SUP> NAA. The results revealed that different parts of Haworthia inflorescences showed different organogenesis responses. Therefore, this study contributes to a better understanding of the organogenesis response of Haworthia cultivars on different media.
A Review of Theoretical Models of Social Commerce
Yesmin, Most. Nirufer,Hossain, Md. Alamgir,김민호 전북대학교 산업경제연구소 2020 아태경상저널 Vol.12 No.2
Social commerce (S-commerce) is a new movement of electronic commerce (e-commerce) channeled via social media which brought together online and offline environments. Due to the huge user base and the fastest accessibility of social media, s-commerce has come to be a new vicinity of pastime for practitioners and researchers. A systematic review approach was applied to collect data from s-commerce literature, including different academic articles published from 2006-2019. We review the history, definition, dimension of s-commerce. This paper explores various de?nitions of s-commerce and seven dimensions of it that will help to promote and sell products and services. This study ends with some effective guidelines for future s-commerce that would create significant value for sustainable development, and demonstrate that s-commerce is an admirable vehicle for creating social value in the form of social engagement.
Cytogenetic assessment of Haworthia using flow cytometry and fluorescence in situ hybridization
Reshma Yesmin,Md. Mazharul Islam,Deen Mohammad Deepo,김홍열,Chang Kil Kim,Ki-Byung Lim 한국원예학회 2022 Horticulture, Environment, and Biotechnology Vol.63 No.1
The purpose of this study was to investigate cytogenetic variations between the nine Haworthia species necessary forsubsequent breeding. Flow cytometric analysis of H. badia ‘Murasaki’, H. splendens , H. truncata ‘Seiko’, H. cooperi var. obtusa , H. cymbiformis , H. mirabilis var. mundula , and H. retusa showed a wide range of DNA content from 10.17 to12.17 pg/1C, whereas two tetraploids, H. limifolia and H. angustifolia var. baylisii , showed higher DNA content of 16.81 and12.64 pg/1C, respectively. Seven diploid Haworthia expressed three karyotype formulas, whereas two tetraploid Haworthiaeach expressed a diff erent karyotype formula. Secondary constriction was observed in H. truncata ‘Seiko’ and H. cooperivar. obtusa . Results of fl uorescence in situ hybridization (FISH) showed a major diff erence between the diploid and tetraploidHaworthia in the distribution of 5S and 18S ribosomal DNA (rDNA) loci. There were eight loci in two out of sevendiploids and both tetraploid Haworthia , while H. cymbiformis and H. mirabilis var. mundula each showed seven 18S rDNAloci. H. badia ‘Murasaki’, H. splendens , and H. retusa had four, three, and fi ve 18S rDNA loci, respectively. In addition, asingle pair of 5S rDNA loci was observed in all diploid Haworthia except H. cooperi var. obtusa , which had four 5S rDNAloci. Each tetraploid Haworthia had four 5S rDNA loci, with two strong and two weak signals. All 5S and 18S rDNA lociwere observed on the long arm, in the subtelomeric or telomeric region, while a signifi cant variation in chromosome lengthwas observed among the Haworthia . This cytological analysis provides the necessary genetic information to elucidate thegenetic makeup of newly introduced Haworthia hybrids.
Sabrina Yesmin Barsha,Miah Md. Akiful Haque,Md Utba Rashid,Mohammad Lutfor Rahman,Mohammad Ali Hossain,Sanjana Zaman,Elias Bhuiyan,Rahima Sultana,Mosharop Hossian,Mohammad Hayatun Nabi,Mohammad Delwer 대한백신학회 2021 Clinical and Experimental Vaccine Research Vol.10 No.3
A 77-year-old man with a past medical history of type 2 diabetes mellitus, peripheral neuropathy, and chronic obstructive pulmonary disease was admitted to the intensive care unit of Bangladesh Medical College Hospital with acute encephalopathy and non-ST segment elevation myocardial infarction (NSTEMI). The patient was on antidiabetic medicine along with H2 blocker and multivitamins for his existing diseases. The patient’s attendant reported that the patient had received his first dose of the Moderna coronavirus disease 2019 (COVID-19) vaccine just 2 days ago. Physical examination revealed that he had a Glasgow Coma Scale of 8/15; a pulse of 106 beats/min; a respiratory rate of 30 breaths/min; oxygen saturation of 80% on room air, which became with 10 L of oxygen and blood pressure of 90/60 mm Hg at the time of admission. During the hospital stay, the patient was treated conservatively with intravenous antibiotics and other necessary medication. Although we have observed the onset of encephalopathy and NSTEMI following COVID vaccination for this patient, we, as healthcare professionals, cannot directly attribute the cause of the complications to the Moderna vaccine without further epidemiological studies with large samples.