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Search Results: 1 - 10 of 51507 matches for " Tsui Wei Choong "
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Photosynthetic Capacities and Productivity of Indoor Hydroponically Grown Brassica alboglabra Bailey under Different Light Sources  [PDF]
Jie He, Lin Qin, Yunman Liu, Tsui Wei Choong
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.64060
Abstract: A major challenge for growing vegetables in an indoor vertical farming system will be supplying not only sufficient quantity but also quality of light. It has been reported that yield of crops is enhanced under appropriate combination of red and blue light compared with red light alone. This project aims to investigate the effects of different combinations of red and blue. Plants were cultured for a 12-h photoperiod at 210 μmol·m–2·s–1 photosynthetic photon flux density (PPFD) under different combinations of red (R) and blue (B) light-emitting diodes (LED). The R:B-LED ratios are: 1) 100:0 (0B); 2) 92:8 (8B); 3) 84:16 (16B) and; 4) 76:24 (24B). All combined RB-LEDs significantly increased light-saturated photosynthetic CO2 assimilation rate (Asat), stomatal conductance (gs sat) and productivity compared with those under 0B. Results suggested that 16B was the most suitable combination of LEDs to achieve the highest productivity for B. alboglabra. To further substantiate these results, comparative studies were conducted under equal photoperiod and PPFD among 16B (RB-LED), white LED (RBW-LED) and high-pressure sodium (HPS) lamps. Shoot, root biomass, leaf number, leaf mass per area and Asat were higher in plants under HPS lamps and RB-LED, than under RBW-LED. However, gs sat was lower under RB-LED and RBW-LED, than under HPS lamps. Plants under RB-LED had higher electron transport rate and photochemical quenching but lower non-photochemical quenching than those under RBW-LED and HPS lamps. Thus, these results more conclusively affirmed that 16B was the most suitable light source to achieve the highest photosynthetic capacities. The findings of this study could also be used in vertical farming to achieve the highest productivity of vegetable crops such as B. alboglabra within the shortest growth cycle with reduced energy consumption.
Effects of Root-Zone Temperature on Photosynthesis, Productivity and Nutritional Quality of Aeroponically Grown Salad Rocket (Eruca sativa) Vegetable  [PDF]
Jie He, Xin Er See, Lin Qin, Tsui Wei Choong
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.714181
Abstract: Although tropical high ambient temperature and humidity severely reduced the productivity of temperate plants, temperate vegetable crops such as lettuce have been successfully grown in Singapore by only cooling its root-zone. In this paper, a cool Meditteranean vegetable, Eruca sativa, was studied to understand how different RZTs can impact its shoot productivity, photosynthesis and nutritional quality. All plants were cultivated using aeroponic systems in a tropical greenhouse under hot ambient conditions where roots were subjected to four different root-zone temperatures (RZTs) of 20°C-RZT, 25°C-RZT, 30°C-RZT and fluctuating ambient temperatures ranged from 25°C to 38°C [25°C/38°C (ambient)]-RZT. Parameters studied include shoot fresh weight (FW), photosynthetic gas exchange, midday chlorophyll (Chl) fluorescence Fv/Fm ratio, Chl fluorescence photochemical quenching (qP), non-photochemical quenching (qN) and electron transport rate (ETR), total phenolic compounds and mineral content such as potassium (K), calcium (Ca), magnesium (Mg) and iron (Fe). Among the 4 different RZT treatments, E. sativa plants grown under ambient-RZT (25/38°C-RZT) had the lowest shoot and root FW while those plants grown under 20°C-RZT had highest productivity of shoot and root. However, there were no significant differences in shoot and root FW in plants grown at 25°C- and 30°C-RZT. Compared to plants grown under 25°C/38°C (ambient-RZT), light-saturated photosynthetic CO
Adaptation of Arabidopsis Plants to Tropical Aeroponics Using Cool Root Zone Temperatures  [PDF]
Sandhya Srikanth, Tsui Wei Choong, Jiashu Chu, Jie He, Zhong Chen
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.813222

Arabidopsis thaliana (L.) Heyhn. is a well known model plant in plant research. However, its growth conditions and diminutive stature associated with low biomass at maturity make it a challenging species for physiological studies. While in the tropical countries, it can only be grown either by tissue cultures or in growth chambers under controlled conditions. An aeroponic technique with 20°C ± 2°C and 30°C ± 2°C root-zone temperatures (RZT) was used to grow Arabidopsis (Columbia ecotype) in a tropical greenhouse with natural irradiance and high ambient temperature (38°C/28°C day/night). Seedlings germinated in growth chambers at 20°C or 30°C. At 6 to 8 leaf stage, they were transferred to the aeroponic troughs with their roots exposed to constant temperature of 20°C ± 2°C and 30°C ± 2°C while their aerial parts were subjected to fluctuating ambient temperature from 28°C to 38°C. After a week, plants have acclimatised to both RZTs and started developing normal rosettes, bolted and yielded viable seeds. However, 20°C ± 2°C RZT allowed them to recover from turgor pressure despite of wilting, and significantly increased biomass. Mature plants grown in each RZTs were compared morphologically and physiologically to the plants grown in growth chamber (GC) at 20°C (root and shoot) temperature with 60% relative humidity. Aeroponically grown plants did not experience photoinhibition, and also exhibited higher photosynthetic light usage efficiency and higher capacities of heat dissipation, compared to GC plants. This aeroponics with cool RZTs can allow the use of Arabidopsis as a model plant even under tropical climate.

Attitudes Regarding the Market Economy in Urban China  [PDF]
Ming Tsui, Xiao Li
Sociology Mind (SM) , 2012, DOI: 10.4236/sm.2012.22024
Abstract: Compared with only thirty-five years ago, today’s China is a different country. As recently as the early 1980s, despite universal poverty, there were universal, life-time employment, cheap work-place-provided housing, national healthcare, and free college education. For those who were born under communism, attitudes toward capitalism were largely negative and large disparities in income and wealth were seen as immoral and unjust. Today the state no longer assigns jobs to those who have completed their education and urban life-time employment and national healthcare are long gone. While there have been stunning improvements in living conditions, the rapid increases in housing prices, coupled with increasing unemployment and a disappearance of job security and national health care, have made ordinary people vulnerable. Because China has become one of the most unequal societies in the world in terms of income and wealth, there is also a sense of discontent among many of its citizens. Using a 2006 national survey, we explore how these changes have affected the public attitudes toward economic reform and communist rule. To our surprise, we found general agreement across different generation, education, and income-mobility groups as regards market economy, the legitimacy of profit-making and income inequality, the role and authority of the government, and the causes of poverty and inequality. The differences among generation, education, and income groups are largely in degree. We suggest that the lack of generation, income, and education differences on attitudes may be due to material benefits brought by the market economy and high economic growth.
Scheduling Mobile Data Services in a Bluetooth  [PDF]
Xiaoyu Liu, Kin Choong Yow
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.33040
Abstract: Public buses play an important role in public transportation in most parts of the world and it is still the dominant public transportation mode in some regions. Nowadays, as people switch to a mobile lifestyle, they spend significant amount of time on the traveling to work, back and forth. However, not much research has been done on how to provide some on-board service for those commuters in the public bus. This paper presents a Bluetooth-based system which is inexpensive, yet flexible, and scalable to serve commuters in a personalized manner using Bluetooth enabled mobile phones. However, from the Bluetooth specification, one Bluetooth dongle can connect to at most seven other Bluetooth devices. As we expect more than 7 users to use the services provided in the Bluetooth-based system (a full double-deck bus can carry around 100 passengers), we need to work out an effective scheduler to schedule all the private services on the Bluetooth servers in the bus. This paper also describes a scheduling algorithm that exploits the park mode feature of the Bluetooth specification to allow more users to have access to the Bluetooth services on the bus.
Reduced Newcastle disease virus-induced oncolysis in a subpopulation of cisplatin-resistant MCF7 cells is associated with survivin stabilization
Mohd-Hafifi Jamal, Wei-Choong Ch’ng, Khatijah Yusoff, Norazizah Shafee
Cancer Cell International , 2012, DOI: 10.1186/1475-2867-12-35
Abstract: Cisplatin-resistant cell line (MCF7-CR) was developed from the MCF7 human breast adenocarcinoma cell line by performing a seven-cyclic exposure to cisplatin. Following NDV infection, fluorescence-activated cell sorting (FACS) analysis and immunoblotting were used to measure cell viability and viral protein expression, respectively. Production of virus progeny was then assessed by using the plaque assay technique.Infection of a mass population of the MCF7-CR with NDV resulted in 50% killing in the first 12 hours post-infection (hpi), comparable to the parental MCF7. From 12 hpi onwards, the remaining MCF7-CR became less susceptible to NDV killing. This reduced susceptibility led to increased viral protein synthesis and virus progeny production. The reduction was also associated with a prolonged cell survival via stabilization of the survivin protein.Our findings showed for the first time, the involvement of survivin in the reduction of NDV-induced oncolysis in a subpopulation of cisplatin-resistant cells. This information will be important towards improving the efficacy of NDV as an anticancer agent in drug resistant cancers.Cisplatin cis-diaminedichloroplatinum(II), CDDP] is one of the widely used drugs to treat cancer patients. It was first discovered in 1969 [1] and has since been used to treat a variety of malignant tumors such as lung, ovarian, head and neck, bladder and testicular cancers [2]. Even though CDDP and other platinum complexes are not commonly used in the current therapy of breast cancers, they have recently been introduced into the clinical setting as an emerging new treatment modality [3,4]. The mode of action of this drug is believed to result from binding of its platinum molecule onto DNA of target cell. The incorporation of CDDP into DNA produces intrastrand and interstrand crosslink adducts [5,6]. The DNA-platinum adducts then prevent cells from undergoing DNA replication, prevent efficient RNA transcription and disrupting cell cycle which eve
Immunization with recombinant enterovirus 71 viral capsid protein 1 fragment stimulated antibody responses in hamsters
Ch’ng Wei-Choong,Stanbridge Eric J,Wong Kum-Thong,Ong Kien-Chai
Virology Journal , 2012, DOI: 10.1186/1743-422x-9-155
Abstract: Enterovirus 71 (EV71) causes severe neurological diseases resulting in high mortality in young children worldwide. Development of an effective vaccine against EV71 infection is hampered by the lack of appropriate animal models for efficacy testing of candidate vaccines. Previously, we have successfully tested the immunogenicity and protectiveness of a candidate EV71 vaccine, containing recombinant Newcastle disease virus capsids that display an EV71 VP1 fragment (NPt-VP11-100) protein, in a mouse model of EV71 infection. A drawback of this system is its limited window of EV71 susceptibility period, 2 weeks after birth, leading to restricted options in the evaluation of optimal dosing regimens. To address this issue, we have assessed the NPt-VP11-100 candidate vaccine in a hamster system, which offers a 4-week susceptibility period to EV71 infection. Results obtained showed that the NPt-VP11-100 candidate vaccine stimulated excellent humoral immune response in the hamsters. Despite the high level of antibody production, they failed to neutralize EV71 viruses or protect vaccinated hamsters in viral challenge studies. Nevertheless, these findings have contributed towards a better understanding of the NPt-VP11-100 recombinant protein as a candidate vaccine in an alternative animal model system.
Soft Tissue Sarcoma: New Paradigms in Care
Peter Choong
Sarcoma , 2012, DOI: 10.1155/2012/439208
Review article: Reconstructive surgery following resection of primary and secondary tumours of the hip.
Choong PF
Journal of Orthopaedic Surgery , 2000,
Soft Tissue Sarcoma: New Paradigms in Care
Peter Choong
Sarcoma , 2012, DOI: 10.1155/2012/439208
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