4,496 research outputs found
Caridina bruneiana Choy 1992
No full textCaridina bruneiana Choy, 1992 Caridina bruneiana Choy, 1992: 49, Figs.1–4 [type locality: Brunei]; Wowor et al., 2004:343, Fig. 7A–C. Material examined. – Singapore: 2 males, cl 3.0– 3.1 mm, 1 female, cl 3.5 mm, 17 ovigerous females, cl 4.8–6.1 mm, RMNH D 16621, Jurong, Singapore, coll. E. R. Alfred, 22 Mar.1958; 3 males, cl 3.0– 3.5 mm, 3 females, cl 2.3–3.2 mm, ZRC 1979.4.18.13–18, Sungai Peng Siang, 12 miles from Chua Chu Kang Road, Singapore, 18 Aug.1961. Habitat. – Similar to C. peninsularis, i.e. in streams or rivers with seawater influence. Remarks. – With regard to the form of the rostrum, Caridina bruneiana is very similar to C. peninsularis, with which it has been found to occur together. However, it can be separated from C. peninsularis by the relatively higher rostrum, higher number of postorbital rostral teeth (2–3 vs. 3–5) and spinules on the dactylus of fifth pereiopod (19–22 vs. 38–42); and the absence of a spine on the preanal carina. Its presence in Singapore suggests a wider distribution in the Peninsular Malaysia, although it is not formally known there at present. Distribution. – Borneo, Singapore (Choy, 1992; present study).Published as part of Cai, Yixiong, Ng, Peter K. L. & Choy, Satish, 2007, Freshwater Shrimps Of The Family Atyidae (Crustacea: Decapoda: Caridea) From Peninsular Malaysia And Singapore, pp. 277-309 in Raffles Bulletin of Zoology 55 (2) on page 284, DOI: 10.5281/zenodo.533354
Youth learners: The authentic neglected species learning for an unknown future
No full textAbstract: This paper reports on a major research project that investigated youth learning. Specific parts of the project have been published in other literature (Choy 2000, Choy and Delahaye 2000 and Choy and Delahaye 2001), and this paper provides an overview of the findings. The Study Process Questionnaire, the Student Orientation Questionnaire and the Learning Preference Assessment were completed by 448 youths (aged 18 to 24 years) from TAFE 59 % and university (41%). Fifty three youths participated in five follow-up focus groups. Generally, youths studied in this project were found to be surface learners with low level of readiness for self-directed learning but, surprisingly, they showed a high preference for a combination of structured and unstructured learning. Youth comments on formal learning, the learning institutions and role conflicts are discussed. Finally, the paper suggests that learners progress through a four stage development sequence and that youth learners are at Stage 2
Episode 5 - 2002: Vancouver's Book Club Choy(ce):
No full textThis episode of Vancouver Special we explore the year - 2002 - with a look back at the launch of Vancouver's first city-wide book club, One Book, One Vancouver.
CBC's sets the scene for 2002 and award-winning author Wayson Choy visits us in studio to talk about having his highly acclaimed bestseller selected as One Book, One Vancouver's inaugural title.
Popular with readers across the city and beyond, VPL's One Book, One Vancouver was created to promote and encourage a culture of reading and discussion in Vancouver. From 2002 to 2010 the program featured ten amazing books and dozens of imaginative programs – from author readings and neighbourhood walking tours to dinners in the heart of Stanley Park and boxing demonstrations in a regulation-size ring at Library Square – each designed to bring each book's theme's alive.
Wayson Choy's first novel, The Jade Peony, spent six months on The Globe and Mail's national bestseller list in 1995 and won the 1996 City of Vancouver Book Award. In 2002, it chosen as the inaugural book for One Book, One Vancouver.
And, VPL librarian Tim McMillan brings is back to bring it all together with some great reads you can find at your library.
The theme song is “North Wind” by Vancouver band Lakefield, from the album Sounds from the Treeline
Differences in acquisition of organic nitrogen in soils between bok choy and tomato
No full textSeedlings of bok choy and tomato were grown in soils with different N nitrogen [no N (-N), ammonium sulfate (AS), and cattle farmyard manure (CM)]. Comparison between soils treated with -N and CM indicated that the growth and N accumulation in bok choy were significantly enhanced by CM treatment, whereas no difference was found in tomato. In the rhizosphere soils, the highest protease activity was detected in CM treatment irrespective of species. Correlation analysis between rhizospheric protease activity and total N accumulation of plant treated with -N and CM showed a significant positive correlation only for bok choy. The determination of amino acid absorption rate in excised roots indicated that glycine was taken up at a significantly higher rate in bok choy than tomato. This study suggested that at least two possible factors affected the acquisition of organic N: rhizospheric protease activity and ability to absorb amino acids in roots
The effects of silicon nutrition on hydroponically grown lettuce, bok choy and basil
No full textConsidered a “stress nutrient”, silicon has been reported to provide beneficial effects to plants grown under biotic and abiotic stresses. The mechanisms considered are either an accumulation of absorbed silicon in the epidermal tissue, or an expression of metabolic or pathogenesis-mediated host defense responses. In the case of silicon nutrition, plants are considered silicon accumulators or non-accumulators. It is commonly accepted that accumulators can benefit from silicon, but studies have shown that non-accumulators can sometimes benefit from silicon nutrition when under stress on a case-by-case basis. The objective of this dissertation study was to reveal the potential beneficial effects of silicon nutrition on three hydroponically grown silicon non-accumulator vegetable species, lettuce, bok choy, and basil, representing the common leafy green families of Asteraceae, Brassicaceae, and Lamiaceae. None, low and high levels of silicon (0, 25 and 75 ppm) were added to the hydroponic nutrient solution. The plants were grown under temperature stresses (heat stress to lettuce and bok choy, and cold stress to basil), cut-and-grow-back stresses (lettuce, bok choy and basil), and biotic stresses (lettuce powdery mildew, simulated insect chewing on bok choy, and basil downy mildew). Plant growth, stress responses, and tissue nutrient analysis (including silicon) were evaluated. When grown under heat stress, silicon treatments failed to provide any beneficial effects for lettuce and bok choy. Basil grown under cold stress benefited from silicon treatments resulting in increased cold hardiness and improved survival rates after rates after a single frost event. Lettuce, bok choy, and basil grown under temperature stresses absorbed silicon in small quantities. The cut and grow back treatment did not result in silicon accumulation in lettuce, bok choy, and basil. The lettuce powdery mildew experiments failed due to the inability to establish sufficient disease pressure. The mechanical wounding treatment (representing insect chewing damage) in bok choy did not result in enhanced Si accumulation. For basil exposed to downy mildew, silicon treatments marginally increased the disease resistance without enhancing silicon accumulation. For most of the experiments, Si nutrition did not alter the content of other macro- and micro nutrients in both shoots and roots of lettuce, bok choy and basil. Future experiments are needed to evaluate the feasibility of using silicon as an effective BDM control agent for commercial growers. This dissertation research provided valuable information for understanding the physiology of silicon in non-accumulator plant species, and its potential beneficial effects for non-accumulator crops.Ph.D.Includes bibliographical reference
Physiological and Transcriptomic Responses of Bok Choy to Heat Stress
No full textHigh temperatures have adverse effects on the yield and quality of vegetables. Bok choy, a popular vegetable, shows varying resistance to heat. However, the mechanism underlying the thermotolerance of bok choy remains unclear. In this study, 26 bok choy varieties were identified in screening as being heat-resistant at the seedling stage; at 43 °C, it was possible to observe obvious heat damage in different bok choy varieties. The physiological and biochemical reactions of a heat-tolerant cultivar, Jinmei (J7), and a heat-sensitive cultivar, Sanyueman (S16), were analyzed in terms of the growth index, peroxide, and photosynthetic parameters. The results show that Jinmei has lower relative conductivity, lower peroxide content, and higher total antioxidant capacity after heat stress. We performed transcriptome analysis of the two bok choy varieties under heat stress and normal temperatures. Under heat stress, some key genes involved in sulfur metabolism, glutathione metabolism, and the ribosome pathway were found to be significantly upregulated in the heat-tolerant cultivar. The key genes of each pathway were screened according to their fold-change values. In terms of sulfur metabolism, genes related to protease activity were significantly upregulated. Glutathione synthetase (GSH2) in the glutathione metabolism pathway and the L3e, L23, and S19 genes in the ribosomal pathway were significantly upregulated in heat-stressed cultivars. These results suggest that the total antioxidant capacity and heat injury repair capacity are higher in Jinmei than in the heat-sensitive variety, which might be related to the specific upregulation of genes in certain metabolic pathways after heat stress
Impact of Anaerobic Fermentation Liquid on Bok Choy and Mechanism of Combined Vitamin C from Bok Choy and Allicin in Treatment of DSS Colitis
No full textIn the context of pollution-free waste treatment, anaerobic fermentation liquid (AFL), a prominent by-product of biogas engineering, has emerged as a focal point in contemporary research. Concurrently, vitamin C, an active compound abundant in fruits and vegetables, possesses extensive application potential. The development of efficient extraction processes and the utilization of its biological activities have garnered significant attention from researchers. This study investigated the impact of AFL on the growth and vitamin C content of Bok choy through field trials of varying concentrations of AFL. The results indicated that the growth characteristics of Bok choy exhibited a concentration-dependent trend with increasing AFL dosage, with the highest yield observed in the AFL-2 group (8.43 kg/m2). Additionally, with the increase in the concentration of the AFL application, the vitamin C content in Bok choy exhibited a trend of initially increasing and then decreasing, reaching its highest value (70.83 mg/100 g) in the AFL-1 group. Furthermore, response surface methodology was employed to optimize the microwave-assisted organic solvent extraction process of vitamin C, revealing that the optimal conditions for microwave-assisted extraction using a 2% citric acid solution were as follows: a microwave power of 313 W, a microwave time of 1.3 min, and a liquid-to-solid ratio of 16.4:1 v/w, achieving a vitamin C extraction rate of 90.77%. Subsequent mechanistic studies on colitis repair demonstrated that the combination of vitamin C and allicin significantly enhanced the ability of intestinal microorganisms to ferment and degrade complex carbohydrates in colitis-afflicted mice, thereby alleviating intestinal inflammation, markedly reducing bacterial invasion signals on intestinal epithelial cells, and decreasing the risk of intestinal infection. This study provides a valuable perspective for the harmless utilization of agricultural waste, and provides a theoretical basis and technical support for the high-value utilization of natural active ingredients
New concept to break the intrinsic properties of organic semiconductors for optical sensing applications
No full textThe space charge limit (SCL) effect is a universal phenomenon in semiconductor devices involving light emitting diodes, solar cells, and photodetectors. Typically, the SCL will exist in the condition of (1)
unbalanced hole and electron mobility; (2) thick active layer; (3) high light intensity or dense photocarriers (electrons and holes) generation; and (4) moderate reverse bias. Through the study of plasmonic organic solar cells, we will show metallic nanostructures go beyond their optical functions to
control recombination, transport, and collection of photocarriers generated from active organic materials. Through spatially redistributing light absorption at the active layer, the proposed plasmonic-electrical concept is fundamentally different from the hot carrier effect where photocarriers are generated from metallic nanostructures. The new plasmonic-electrical effect not only lays a physical foundation but also upgrades electrical properties for semiconductor devices [1]. We will also design different device
structures to investigate and demonstrated how plasmonic-electrical [2] and plasmonic-optical [3] effects can be used to enhance device performances such as improving the light absorption of solar cells, increasing emission efficiency of light emitting devices, reducing dark current and enhancing
sensitivity of photodetector as well as intensifying the surface enhanced Raman scattering for biosensor applications. Besides the optical (plasmonic) resonances from metal nanostructure, we will also use metal nanostructures to demonstrate electrical resonance which can be used for bistable and
memory devices [4]. Consequently, exploiting both plasmonic-optical and plasmonic-electrical effects via metallic nanostructures will open up a more flexible and integrated way to design high-performance optoelectronic nanodevices.
[1] W.E.I. Sha, X. Li, W.C.H. Choy, Scientific Reports, vol. 4, p. 6236 (10pp), 2014.
[2] F.X. Xie, W.C.H. Choy, W.E.I. Sha, D. Zhang, S. Zhang, X. Li, C.W. Leung, J. Hou, Energy Environ. Sci., vol. 6, pp.3372 – 3379, 2013; D. Zhang, W.C.H. Choy, F. Xie, W.E.I. Sha, X. Li, B. Ding, K. Zhang, F. Huang, and Y. Cao, Adv. Funct. Mat., vol. 23, pp.4255–4261, 2013; D.D.S. Fung, L. Qiao, W.C.H. Choy, C.C.D. Wang, W.E.I. Sha, F. Xie, and S. He, J. Mater. Chem., vol. 21, pp. 16349
– 16356, 2011.
[3] X.H. Li, W.C. H. Choy, X. Ren, D. Zhang, H.F. Lu, Adv. Funct. Mat. DOI: 10.1002/adfm.201303384; X.H.Li, W.C.H.Choy, H.F. Lu, W.E.I. Sha, and H. P. Ho, Adv. Funct. Mat., vol.23, pp.2728–2735, 2013; X.H. Li, W. C.H. Choy, L Huo, F.X. Xie, W.E.I. Sha, B. Ding, X. Guo, Y. Li, J. Hou, J. You, Y. Yang, Adv. Mater. vol. 24, pp.3046-3052, 2012; X.H. Li, W. E.I. Sha, W.C.H. Choy, D.D.S. Fung, F. X. Xie, J. of Phys. Chem. C, vol. 116, pp.7200-7206, 2012; C.C.D. Wang, W. C. H. Choy, C. Duan, D.D.S. Fung, W.E.I. Sha, F.X. Xie, F. Huang, and Y. Cao, J. Mater. Chem., vol. 22, pp.1206–1211, 2012.
[4] T.H. Zheng, W.C.H. Choy, and Y.X. Sun, vol. 19, pp.2648-2653, 2009; T.H. Zheng, W.C.H. Choy, and Y.X. Sun, Appl. Phys. Lett, vol. 94, 123303 (pp.3), 2009.published_or_final_versio
The atyid shrimps of Fiji with description of a new species
No full textFourteen species of shrimps belonging to four genera of the family Atyidae are reported from the Fiji Islands. Three genera are represented by only one species each: Antecaridina lauensis (Edmondson, 1935), Atyoida pilipes (Newport, 1847) and Atyopsis spinipes (Newport, 1847) while the fourth, Caridina is represented by eleven species (including one new, Caridina devaneyi spec. nov. which is described and illustrated). Keys are provided to separate the genera and species. Two species, Caridina japonica De Man, 1892 and C. longirostris H. Milne Edwards, 1837 are recorded from Fiji for the first time. C. devaneyi spec, nov., C. fijiana Choy, 1983 and C. nudirostris Choy, 1984 are so far known only from Fiji and may be endemic to the island of Viti Levu. All three have relatively large eggs and are thought to undergo either direct or abbreviated larval development, thus resulting in their restricted distribution.
Most of the other species recorded have a wide Indo-Pacific distribution
Degradation dynamics of dimethoate in Bok choy by TiO<sub>2</sub>/Ce.
No full textThe residue change of dimethoate in Bok choy (A: original data; B: log transferred data). C0 and C represent the initial and reacting (time = t) residues of dimethoate in Bok choy, respectively. The C0 of dimethoate residual concentrations of 600 g a.i. /ha for time zero was 15.859 mg/kg.</p
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