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Search Results: 1 - 10 of 42604 matches for " Xiaoxue Xu "
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Testing and Analysis of Pulse Detection Circuits Based on the Concept of Chinese Medicine
Xinsheng Che,Xiaoxue Gu,Dongxue Fan,Hui Xu
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: In order to get real pulse information and research pulse instrument by using Chinese medicine, a method about testing pulse detection circuits is proposed by use of the definition of Chinese medicine pulse in this study and detection circuits from three different pulse instruments are analyzed using this method. The existence of distortion in circuits is proved by using electronic circuit simulation and hardware circuit experiments. At the same time, the quantified distortion errors of three pulse detection circuits are given according to describing the pulse parameters of Chinese medicine. These pulse parameters and data can be used to optimize the pulse detection circuits.
Optimization of Ultrasonic-Assisted Extraction and Radical-Scavenging Capacity of Phenols and Flavonoids from Clerodendrum cyrtophyllum Turcz Leaves
Jing Zhou, Xiaoxue Zheng, Qi Yang, Zhenyi Liang, Donghai Li, Xiaobo Yang, Jing Xu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0068392
Abstract: Ultrasonic-assisted extraction (UAE) was developed to extract phenolic and flavonoid antioxidants from Clerodendrum cyrtophyllum Turcz leaves. The optimal experimental parameters for antioxidant extraction from C. cyrtophyllum leaves were measured using single-factor experimentation combined with response surface methodology (RSM). Total phenolic content (TPC) and total flavonoid content (TFC) assays were used to quantify antioxidant compounds. Next, antioxidant radical scavenging capacity was measured using 2,2′-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′ -azino-bis(3-ethylbenzothiazoline-6-sulp?honicacid)(ABTS) radicals. Optimized extraction conditions for UAE from C. cyrtophyllum leaves were as follows: 60.9% ethanol, 85.4 min, and 63.3°C for maximal TPC extraction (16.8±0.2 mg GAE/g DW); 67.7% ethanol, 82.9 min, and 63.0°C for maximal TFC extraction (49.3±0.4 mg RT/g DW); 48.8% ethanol, 85.1 min, and 63.9°C for maximal DPPH radical-scavenging capacity (86.8±0.2%); and 50.6% ethanol, 81.3 min, and 63.4°C for maximal ABTS radical-scavenging capacity (92.9±0.5%). Ethanol concentration was the most important factor in the extraction process. Our work offers optimal extraction conditions for C. cyrtophyllum as a potential source of natural antioxidants.
The GC/MS Analysis of Volatile Components Extracted by Different Methods from Exocarpium Citri Grandis
Zhisheng Xie,Qundi Liu,Zhikun Liang,Mingqian Zhao,Xiaoxue Yu,Depo Yang,Xinjun Xu
Journal of Analytical Methods in Chemistry , 2013, DOI: 10.1155/2013/918406
Abstract: Volatile components from Exocarpium Citri Grandis (ECG) were, respectively, extracted by three methods, that is, steam distillation (SD), headspace solid-phase microextraction (HS-SPME), and solvent extraction (SE). A total of 81 compounds were identified by gas chromatography-mass spectrometry including 77 (SD), 56 (HS-SPME), and 48 (SE) compounds, respectively. Despite of the extraction method, terpenes (39.98~57.81%) were the main volatile components of ECG, mainly germacrene-D, limonene, 2,6,8,10,14-hexadecapentaene, 2,6,11,15-tetramethyl-, (E,E,E)-, and trans-caryophyllene. Comparison was made among the three methods in terms of extraction profile and property. SD relatively gave an entire profile of volatile in ECG by long-time extraction; SE enabled the analysis of low volatility and high molecular weight compounds but lost some volatiles components; HS-SPME generated satisfactory extraction efficiency and gave similar results to those of SD at analytical level when consuming less sample amount, shorter extraction time, and simpler procedure. Although SD and SE were treated as traditionally preparative extractive techniques for volatiles in both small batches and large scale, HS-SPME coupled with GC/MS could be useful and appropriative for the rapid extraction and qualitative analysis of volatile components from medicinal plants at analytical level. 1. Introduction Exocarpium Citri Grandis (ECG, Huajuhong in Chinese), the dried unripe or ripe fruit peel of Citrus grandis Osbeck or Citrus grandis Osbeck var. tomentosa Hort, is a well-known traditional Chinese medicine [1]. Since it has been proved to possess the effects of clearing heat and expectoration, regulating the flow of vital energy, and stimulating appetite, ECG has been employed in the treatment of coughing, dyspepsia, nausea, itching of throat, and so forth, which makes it widely used in practice for a long time in China [2–4]. ECG from Citrus grandis “tomentosa” (Maojuhong in Chinese) is generally acknowledged to be of better quality than Citrus grandis (L.) Osbeck (Guangjuhong in Chinese). ECG from Huazhou city, Guangdong province, whose plant origin is Citrus grandis “tomentosa,” is usually considered as the genuine medicinal materials [5]. Main phytochemical constituents of ECG were reported as volatile oil, flavonoids, coumarins, and polysaccharides [6–8], among which volatile composition has been investigated worldwide and the essential oil from ECG was broadly used as aroma flavor in food products and flavoring agents to mask the unpleasant tastes of drugs in pharmaceutical
Pathological impairments induced by interstitial implantation of 125I Seeds in spinal canal of banna mini-pigs
Zuozhang Yang, Yongqing Xu, Dakuan Yang, Hongpu Sun, Ruilian Zhao, Jin Zhang, Xiaoxue Wang, Hua Jiang, Lie Xu, Jinlei Zhang
World Journal of Surgical Oncology , 2012, DOI: 10.1186/1477-7819-10-48
Abstract: In present study, 125I seeds were implanted into spinal canal of T13 level of spine in banna mini-pigs. After operation, the pigs were raised up to 8 months, behavior changes were recorded within this period. After 8 months, spinal cords were collected for pathological analysis.In this study, a 125I brachytherapy animal model had been successfully established, in the model group, the banna pigs' Tarlov scale decreased from 5 to 2.57 ± 0.36, significant cellular impairments were noted by pathological analysis.Without any protection and operation improvement, 125I implantation can cause serious histological impairments and moving difficulty for banna mini-pigs; this present research provides an alternative tool to study spinal 125I brachytherapy.As the most frequent bone metastasis, spinal metastases cause severe pain and damage to vertebral bodies such as spinal osteolytic destruction and compression fractures [1,2].Brachytherapy, a form of radiotherapy, a radiation source is permanently placed inside or next to treatment locus. Although 125I brachytherapy is an effective way to kill tumor cells locally and protect healthy tissues, some complications occurs, such as radiation damages to the tissue around the seeds, which may cause complications, especially radiation myelopathy [3,4]. How to reduce this side effect attracted abundant effort from related medical scientists, but clinically complicate conditions restricted the progress of this kind of research.Animal model has long been a good tool to help medical researcher to mimic human body situation and find the best way to solve the clinical problems. Aim to solve the radiation myelopathy problem, many rodent animal models had been used, however, the rodent is small in size compared to human and their immunology system is also different from human being, which restricts the usage of this kind of animal model. In this present study, we chose a banna-mini pig as our model animal; because it had similar body size as h
Total pollution effect of urban surface runoff

LUO Hongbing,LUO Lin,HUANG Gu,LIU Ping,LI Jingxian,HU Sheng,WANG Fuxiang,XU Rui,HUANG Xiaoxue,

环境科学学报(英文版) , 2009,
Abstract: For pollution research with regard to urban surface runo , most sampling strategies to date have focused on di erences in land usage. With single land-use sampling, total surface runo pollution e ect cannot be evaluated unless every land usage spot is monitored. Through a new sampling strategy known as mixed stormwater sampling for a street community at discharge outlet adjacent to river, this study assessed the total urban surface runo pollution e ect caused by a variety of land uses and the pollutants washed o from the rain pipe system in the Futian River watershed in Shenzhen City of China. The water quality monitoring indices were COD (chemical oxygen demand), TSS (total suspend solid), TP (total phosphorus), TN (total nitrogen) and BOD (biochemical oxygen demand). The sums of total pollution loads discharged into the river for the four indices of COD, TSS, TN, and TP over all seven rainfall events were very di erent. The mathematical model for simulating total pollution loads was established from discharge outlet mixed stormwater sampling of total pollution loads on the basis of four parameters: rainfall intensity, total land area, impervious land area, and pervious land area. In order to treat surface runo pollution, the values of MFF30 (mass first flush ratio) and FF30 (first 30% of runo volume) can be considered as split-flow control criteria to obtain more e ective and economical design of structural BMPs (best management practices) facilities.
Operational State Complexity of Deterministic Unranked Tree Automata
Xiaoxue Piao,Kai Salomaa
Electronic Proceedings in Theoretical Computer Science , 2010, DOI: 10.4204/eptcs.31.17
Abstract: We consider the state complexity of basic operations on tree languages recognized by deterministic unranked tree automata. For the operations of union and intersection the upper and lower bounds of both weakly and strongly deterministic tree automata are obtained. For tree concatenation we establish a tight upper bound that is of a different order than the known state complexity of concatenation of regular string languages. We show that (n+1) ( (m+1)2^n-2^(n-1) )-1 vertical states are sufficient, and necessary in the worst case, to recognize the concatenation of tree languages recognized by (strongly or weakly) deterministic automata with, respectively, m and n vertical states.
Transformations Between Different Types of Unranked Bottom-Up Tree Automata
Xiaoxue Piao,Kai Salomaa
Electronic Proceedings in Theoretical Computer Science , 2010, DOI: 10.4204/eptcs.31.18
Abstract: We consider the representational state complexity of unranked tree automata. The bottom-up computation of an unranked tree automaton may be either deterministic or nondeterministic, and further variants arise depending on whether the horizontal string languages defining the transitions are represented by a DFA or an NFA. Also, we consider for unranked tree automata the alternative syntactic definition of determinism introduced by Cristau et al. (FCT'05, Lect. Notes Comput. Sci. 3623, pp. 68-79). We establish upper and lower bounds for the state complexity of conversions between different types of unranked tree automata.
Trust Evaluation Model based on Service Satisfaction
Ruizhong Du,Xiaoxue Ma
Journal of Software , 2011, DOI: 10.4304/jsw.6.10.2001-2008
Abstract: In most of the current trust model, the evaluation of whether an entity is trust is different to different judger. The reason of this phenomenon is that different judger use the different standard in its opinion. So the evaluation lack of convincing, are not well describe the relationship between two parties. In response to these issues, drawing on the trust relationship between human societies, the introduction of the domain and domain trust, building the trust evaluation model based on service satisfaction. In every domain according to the service of the node itself, abstracting representative multiple service attributes from the trusted relationship of the node service, service requester comprehensive evaluates multiple service attributes provided by service provider based on personal interest, and combines with the trust value, decide whether to trade finally; after the transaction, service request calculates QoS(quality of service) difference degree according to actual QoS and service provider’ own QoS claimed to judge the credibility of service provider, then gives corresponding rewards and punishment and trust update. The simulation results show that the model can more accurate assessment of the trust entity, to some extent effective against malicious attacks, which proves the validity and accuracy of the model.
Agrobacterium tumefaciens-mediated transformation as a tool for insertional mutagenesis in thermophilic fungus Thermomyces lanuginosus

Hua Han,Xiaoxue Xu,Yanjie Peng,Dehui Kong,Duochuan Li,

微生物学报 , 2012,
Abstract: 摘要:【目的】建立疏绵状嗜热丝孢菌的稳定遗传转化体系并获得插入突变体。【方法】利用农杆菌介导的方法建立疏绵状嗜热丝孢菌的遗传转化体系;分别通过Southern杂交、克隆转移DNA(T-DNA)侧翼序列来确定T-DNA 在疏绵状嗜热丝孢菌基因组中的拷贝数和插入位点。【结果】成功建立了可靠的疏绵状嗜热丝孢菌的遗传转化体系。共培养过程中使用萌发孢子是成功建立疏绵状嗜热丝孢菌遗传转化体系的必要条件。疏绵状嗜热丝孢菌萌发的孢子与农杆菌在28℃共培养48h时,转化效率最高。乙酰丁香酮(AS)在农杆菌预培养及疏绵状嗜热丝孢菌萌发的孢子与农杆菌的共培养阶段都是必需的,且在共培养阶段当AS浓度为500 μM时转化效率最高。Southern 杂交验证表明,79.2%的转化子为T-DNA单拷贝插入,且通过热不对称PCR(TAIL-PCR)分析得出T-DNA在该菌基因组中的插入位点是随机的。通过该转化系统筛选到部分表型突变体。【结论】我们首次报道了利用ATMT技术成功转化嗜热真菌-疏绵状嗜热丝孢菌,证明了该方法是一种简单有效的获得插入突变体的方法,并为该嗜热真菌进行基因定位提供了工具。
RNA Interference of Four Genes in Adult Bactrocera dorsalis by Feeding Their dsRNAs
Xiaoxue Li,Mingyan Zhang,Hongyu Zhang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0017788
Abstract: RNA interference (RNAi) is a powerful method to inhibit gene expression in a sequence specific manner. Recently silencing the target gene through feeding has been successfully carried out in many insect species.
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