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Search Results: 1 - 10 of 426 matches for " HOI Chupeng "
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Eosinophilic meningitis caused by infection of Angiostrongylus cantonensis in a traveler
GUAN Hongzhi,HOI Chupeng,CUI Liying,CHEN Lin
Chinese Journal of Contemporary Neurology and Neurosurgery , 2013, DOI: 10.3969/j.issn.1672-6731.2013.01.012
Abstract: A 55-year-old female traveler returning from South China with acute onset of meningitis, presenting with eosinophilic pleocytosis in the cerebrospinal fluid was reported. The etiological diagnosis of angiostrongyliasis was confirmed by detection of specific serum antibody against Angiostrongylus cantonensis. Angiostrongyliasis should be considered as a major differential diagnosis for eosinophilic meningitis in the travelers to endemic regions.
‘Yang-Invigorating’ Chinese Tonic Herbs Enhance Mitochondrial ATP Generation in H9c2 Cardiomyocytes  [PDF]
Hoi Shan Wong, Hoi Yan Leung, Kam Ming Ko
Chinese Medicine (CM) , 2011, DOI: 10.4236/cm.2011.21001
Abstract: ‘Yang-invigorating’ Chinese tonic herbs have been shown to enhance the myocardial mitochondrial ATP generation capacity in mice ex vivo. In the present study, we examined the effect of treatment with the methanol extract of ‘Yang-invigorating’ herbs on mitochondrial ATP generation capacity in H9c2 cardio-myocytes. The effect of ‘Yin-nourishing’ herbs was also investigated for comparison. The results indicated that all ‘Yang-invigorating’ Chinese tonic herbs dose-dependently enhanced the mitochondrial ATP genera-tion capacity in H9c2 cardiomyocytes. Three out of nine ‘Yin-nourishing’ herbs produced a dose-dependent stimulatory effect on ATP generation, but to lesser extents than those of Yang herbs. Results obtained from activity-directed fractionation of the three most potent ‘Yang-invigorating’ herbs suggested that the ATP-stimulating ingredients were rather water insoluble and largely resided in the butanol fraction. In con-clusion, ‘Yang-invigorating’ herbs invariably stimulated mitochondrial ATP generation capacity in H9c2 cardiomyocytes. The cell-based assay of ATP generation capacity may be used as pharmacological test for ‘Yang-invigorating’ Chinese tonic herbs.
On two-point configurations in random set
Hoi Nguyen
Mathematics , 2008,
Abstract: We show that with high probability a random set of size $\Theta(n^{1-1/k})$ of $\{1,...,n\}$ contains two elements $a$ and $a+d^k$, where $d$ is a positive integer. As a consequence, we prove an analogue of S\'ark\"ozy-F\"urstenberg's theorem for random set.
On a condition number of random polynomial systems
Hoi Nguyen
Mathematics , 2014,
Abstract: Condition numbers of random polynomial systems have been widely studied in the literature under certain coefficient ensembles of invariant type. In this note we introduce a method that allows us to study these numbers for a broad family of probability distributions. Our work also extends to perturbed systems.
Insecurity of position-based quantum cryptography protocols against entanglement attacks
Hoi Kwan Lau,Hoi Kwong Lo
Physics , 2010, DOI: 10.1103/PhysRevA.83.012322
Abstract: Recently, position-based quantum cryptography has been claimed to be unconditionally secure. In contrary, here we show that the existing proposals for position-based quantum cryptography are, in fact, insecure if entanglement is shared among two adversaries. Specifically, we demonstrate how the adversaries can incorporate ideas of quantum teleportation and quantum secret sharing to compromise the security with certainty. The common flaw to all current protocols is that the Pauli operators always map a codeword to a codeword (up to an irrelevant overall phase). We propose a modified scheme lacking this property in which the same cheating strategy used to undermine the previous protocols can succeed with a rate at most 85%. We conjecture that the modified protocol is unconditionally secure and prove this to be true when the shared quantum resource between the adversaries is a two- or three- level system.
Bearded Reedlings Adjust Their Pair-Bond Behaviour in Relation to the Sex and Attractiveness of Unpaired Conspecifics
Herbert Hoi, Matteo Griggio
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0032806
Abstract: An individual's investment in mating or keeping a pair bond intact may be influenced not only by the attractiveness of its current mate, but also by that of other potential mates. In this study, we investigated the effect of relative attractiveness on pair-bond behaviour in bearded reedlings, Panurus biarmicus. We showed that mate attractiveness, in terms of beard length in males and tail length in females, influenced courtship behaviour when the pair was kept isolated. In the presence of a conspecific, contact initiations within a pair increased. This increment was mainly related to the sex of the unpaired conspecific, however, and less to differences in attractiveness between the current partner and the unpaired conspecific. Female contact initiations towards potential extra mates were independent of male attractiveness, whereas male contact behaviour was significantly influenced by female attractiveness. However, females displayed more contact initiations to their current mate when they were less attractive than the unpaired females. Males decreased their overtures towards other females with increasing attractiveness of their current mates. Overall, our results suggested that, when there was a risk of losing their mate, bearded reedlings adjust their pair-bond investment mainly in response to the presence or absence of a competitor, and fine-tune investment to a lesser extent in response to the attractiveness of that potential competitor.
Enhancement of ATP generation capacity, antioxidant activity and immunomodulatory activities by Chinese Yang and Yin tonifying herbs
Kam Ko, Hoi Leung
Chinese Medicine , 2007, DOI: 10.1186/1749-8546-2-3
Abstract: Aging is a process of bodily change with time, leading to increased susceptibility to disease, and ultimately death. Because reactive oxidant species (ROS) and immune dysfunction are major causes of age-related diseases [1-3], the maintenance of antioxidant and immune fitness is a rational approach to preventive health care. Accumulation of ROS-induced oxidative damage to DNA, proteins, and other macromolecules has been regarded as a major endogenous cause of aging [1]. In addition to ROS-mediated cellular damage, aging was found to be associated with immune senescence, attributable at least partly to the loss of T lymphocyte functions [2,3]. Such loss increases the prevalence of infectious diseases in the elderly. With advances in modern medical research techniques, research on age-related chronic illnesses has become intense, in the quest for valuable preventive and therapeutic measures. Humans have been making continuous efforts to fight aging. As Chinese medicine has always emphasized the prolongation of a healthy lifespan, many Chinese tonifying herbs have long been used to safeguard health and to delay the onset of senility.Under both normal and pathological conditions, ROS are generated in all cells undergoing aerobic metabolism, particularly from mitochondria. The cell possesses two distinct antioxidant defense systems to counteract damaging ROS: (1) enzymatic antioxidants such as catalase, superoxide dismutase (SOD), glutathione peroxidase and other related enzymes/molecules, and (2) non-enzymatic antioxidants such as ascorbic acid (vitamin C), α-tocopherol (vitamin E) and β-carotene. To achieve optimal antioxidant fitness, every component of the antioxidant defense system should function optimally because antioxidants must work together in a synergistic manner. Chinese tonifying herbs have been shown to possess both in vitro and in vivo antioxidant activities [4,5].The immune system fights against 'foreign invaders' such as bacteria, viruses, fungi, yeasts
Only females in poor condition display a clear preference and prefer males with an average badge
Matteo Griggio, Herbert Hoi
BMC Evolutionary Biology , 2010, DOI: 10.1186/1471-2148-10-261
Abstract: Overall we did not find a female preference for enlarged or average badges, but low-quality females spent more time near average badge males. Conversely, high-quality females did not show a clear preference.Collectively, these results indicate that female preference varies with female quality. Differences in female condition are causes of within-population variation in mating preferences. To our knowledge, our results provide one of the first experimental evidences that variation in preference for a male ornament is associated with female condition. In our study, however, only females of low condition displayed a clear mate preference. Differences observed among populations could be partly explained by differences in female condition.Mate choice is one important force driving sexual selection [1,2]. Usually females select males on the basis of vocalisations, behavioural displays, pheromones and morphological traits which may indicate the quality of the males [3]. Many studies on sexual selection focus on the signalling function and fitness consequences when females mate with males that exhibit particular male ornaments [3]. There is little experimental evidence on how intrinsic quality of the choosing individual is integrated in the mate-choice process and affects preference decisions [4,5]. Genetic compatibility may be responsible; the best male varies between different female phenotypes and in its extreme form every female may have its own 'best' male [6]. Alternatively, mate preference may depend on the direct costs and benefits of mating with certain males, which may vary among females. Several models of state-dependent mate choice (for a review see [7]) predict that high-quality females are more choosy and invest more in mate sampling, assuming that mate preference should be more beneficial for high-quality females and low-quality females have less to gain from discrimination. Low-quality females are expected to be less choosy or spend less time in mate samplin
A method to estimate the efficiency of gene expression from an integrated retroviral vector
Hoi Mok, Andrew Lever
Retrovirology , 2006, DOI: 10.1186/1742-4690-3-51
Abstract: Proviral gene expression was detected by the activity of the puromycin resistance gene encoded in the viral vector, and quantified by comparing the growth curve of the sample under puromycin selection to that of a series of calibration cultures. Reproducible estimates of the efficiency of proviral gene expression could be derived. We confirm that contamination from unstable species such as passively transferred plasmid used in viral vector production and unintegrated viral DNA can seriously confound estimates of the efficiency of transduction. This can be overcome using a PCR based on limiting dilution analysis.A simple, low cost method was developed that should be useful in studying the biology of retroviruses and for the development of expression systems for retrovirus based gene therapy.Retroviruses include important human pathogens such as human immunodeficiency virus (HIV) and human T cell leukaemia virus 1 (HTLV-1). One of the features of the retroviral life cycle is integration, where the viral genome is incorporated into that of the host. An integrated viral genome is termed a provirus. A retrovirus can complete its life cycle only if gene expression from the provirus occurs. Studying the efficiency of proviral gene expression can potentially yield insights into the biology of this important class of viruses. In addition, retroviruses are increasingly used as vehicles for transgene delivery in gene therapy [1]. Recently, gene therapy associated insertional oncogenesis in a clinical trial [2] and in experimental models of fetal gene transfer [3] highlighted the importance of assessing the expression efficiency of the therapeutic vectors employed. Information on the efficiency of retroviral vector expression can aid in determining the number of integrations necessary to produce a therapeutic effect, thus improving the accuracy of the risk assessment [4,5], and limiting the dosage of vector used [6].After infection, a retrovirus such as HIV reverse transcribes
Trends and Revitalization of Smart-Learning in Elementary and Middle Schools
Duk-Hoi Koo
Asian Journal of Information Technology , 2012, DOI: 10.3923/ajit.2012.160.168
Abstract: Today, the demand for smart-learning is increasing along with the rapid supply of smart devices. Nevertheless, the current plans for revitalizing smart-learning in school education are absolutely insufficient at the national level. Therefore, this research sought to examine the meaning of smart-learning, analyze its trends and search ways of revitalizing smart-learning. The proposed plans for revitalizing smart-learning include infrastructure building, software support and increasing the capacity of human resources. Through concrete discussions based on these measures of revitalizing smart-learning, practical actions for the sake of advancement of school education are highly anticipated.
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