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Search Results: 1 - 10 of 78226 matches for " CHEN Ruiqing "
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Stage-Structured Impulsive Model for Pest Management
Ruiqing Shi,Lansun Chen
Discrete Dynamics in Nature and Society , 2007, DOI: 10.1155/2007/97608
Abstract: An SI epidemic model with stage structure is investigated. In the model, impulsive biological control is taken, that is, we release infected pests to the field at a fixed time periodically. We get a sufficient condition for the global asymptotical stability of the pest-eradication periodic solution (0,0,I?(t)), and a condition for the permanence of the system. At last, a brief discussion shows that our results will be helpful for pest management.
Enzyme Production and Lignin Degradation by Four Basidiomycetous Fungi in Submerged Fermentation of Peat Containing Medium
Yuanyuan Hong,Mehdi Dashtban,Sanfeng Chen,Ruiqing Song
International Journal of Biology , 2011, DOI: 10.5539/ijb.v4n1p172
Abstract: Biomass decomposing abilities of four basidiomycetous fungi (Pleurotus ostreatus sensu Cooke, Coriolus versicolor (L.) Quel., Tyromyces albidus (Schaeff.) Donk, and Trametes gallica Fr.) were studied using statically submerged media containing peat. The laccase, manganese-dependent peroxidase (MnP), lignin peroxidase (LiP), and total cellulase enzymatic profiles of the four fungi were assessed. The results revealed that laccase is the predominant ligninolytic enzyme secreted during the statically submerged fermentation process using peat as the substrate. T. gallica was the most active laccase producer with about 103 U/L at day 25. C. versicolor produced relatively higher levels of MnP than the other three basidiomycetous fungi (10 U/L). No significant LiP activity was detected in any of the four white rot fungi (WRF). Furthermore, the production of total cellulase by the four white rot fungi is low, which is beneficial to the selectivity of the bio-delignification. The Klason lignin content of the peat sample decreased the most (from 57.5% to 51%) after the treatment by C. versicolor for 25 days. Scanning electron microscopy (SEM) experiments also proved the lignocelluloses in peat were degraded after white rot fungi (WRF) treatment for 80 days. This study provides evidence that WRF can convert peat into usable intermediates in biofuel production.
An Image Encryption Algorithm Utilizing Julia Sets and Hilbert Curves
Yuanyuan Sun, Lina Chen, Rudan Xu, Ruiqing Kong
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0084655
Abstract: Image encryption is an important and effective technique to protect image security. In this paper, a novel image encryption algorithm combining Julia sets and Hilbert curves is proposed. The algorithm utilizes Julia sets’ parameters to generate a random sequence as the initial keys and gets the final encryption keys by scrambling the initial keys through the Hilbert curve. The final cipher image is obtained by modulo arithmetic and diffuse operation. In this method, it needs only a few parameters for the key generation, which greatly reduces the storage space. Moreover, because of the Julia sets’ properties, such as infiniteness and chaotic characteristics, the keys have high sensitivity even to a tiny perturbation. The experimental results indicate that the algorithm has large key space, good statistical property, high sensitivity for the keys, and effective resistance to the chosen-plaintext attack.
A Novel Fractal Coding Method Based on M-J Sets
Yuanyuan Sun, Rudan Xu, Lina Chen, Ruiqing Kong, Xiaopeng Hu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0101697
Abstract: In this paper, we present a novel fractal coding method with the block classification scheme based on a shared domain block pool. In our method, the domain block pool is called dictionary and is constructed from fractal Julia sets. The image is encoded by searching the best matching domain block with the same BTC (Block Truncation Coding) value in the dictionary. The experimental results show that the scheme is competent both in encoding speed and in reconstruction quality. Particularly for large images, the proposed method can avoid excessive growth of the computational complexity compared with the traditional fractal coding algorithm.

Liu Ruiqing,Nai Wenhui,Chen Yuze,Yu Dinghui,

动物学研究 , 1996,
Abstract: White-cheeked gibbon(H. leucogenys) is distributed in the south of Yunnan, China.The chromosomes of a female and a male were studied by several banding techniques(G-,C -and Ag-staining), and a techniqe for simultaneous exhibiting chromosome replication patterns and late replicating Y chromosome. The diploid chromosome number is 52. There are 22 pairs of metacentrlcs or submetacentrics (No. 1-22); 3 pairs of acrocentrics(Nos. 23-25), and chromosomes Nos. 23-24 with a secondary constriction near the centromere on the short arm.The X chromosome is a large metacentric, and the Y, the smallest acrocentric. Its karyotype for mula is 44(M or SM)+ 6(A), XY(M, A). The centrimeric distribution of heterochromatin has been demonstrated in some chromosomes. In addion, there are 3 kinds of heterochromatin on the chromosomes:(1) ab sent of centromeric heterochromatin,(2) interstitial heterochromatin,(3) terminal heterochromatin.Interstitial heterochromatin has been observed on the blarm of X chromosome. Y chromosome is completely C-band positive. Silver staining revealed 5 chromosomes with NORs in the male specimen.4 Ag-NORs of theth are heated on the secondary constriction of chromosomes 23 and 24 respectivly,and one of them is located on the Y chromosome which has been confirmed by Fluorescence in situ hybridization(FISH) in the same cell. There are 4 chromosomes with Ag-NORs in the female specimen,and they are also located on the secondary constriction of chromosomes 23 and 24. Moreover,the association of Ag-NORs have been observed. Base on the above results,the relationship in gibbons and the way of chromosome evo lution in the genus Hylobates have been discussed.

Lan Hong,Chen Zhiping,Liu Ruiqing,

动物学研究 , 1996,
Abstract: 本实验用ApaⅠ,BglⅠ,BglⅡ,ClaⅠ,EcoRⅠ,EcoRⅤ,HindⅢ,HpeⅠ,PstⅠ,PvuⅠⅡ,SacⅠ,SalⅠ等12种限制性内切酶分析猪獾和黄鼬的mtDNA限制性片段,并用双酶解法构建限制性内切酶图谱。结合以往积累的资料,我们对哺乳动物mtDNA限制性位点在远缘物种间的保守性和变异性进行了初步讨论。

Liu Ruiqing Nie Wenhui Chen Yuze,

动物学研究 , 1995,
Abstract: The karyotype of Martes foina intermedia were studied by C-banding and silver staining. The number of diploid chromosome is 38. Autosomes consist of 7 pairs of metacentrics, 2 pairs of submetacentrics, 9 pairs of subacrocentrics. Chromosome No.18 has a secondary constriction near by centromere on the long arm. X chromosome is a metacentrics and of a size between that of chromosome No.3 and No.4, and the Y, the smallest acrocentric.The centromeric distribution of heterochromatin has been demonstrated in most of chromosomes. In some of chromosome centromericregions are stained slightly C-bands. Moreover, the constitutive heterochromatin of centromere region of chromosome No.1 is apparently disappeared. The whole short arm of chromosome No.9 is found to be a complete heterochromatin one. The secondary constriction region of chromosome No.18 is with heterochromatin. The uncommon distribution of interstitial heterochromatin has observed on the long arm of X chromosome. Y chromosome is completely C-band positive.There is only one pair of Ag-NORs in the silver-stained karyotype, it is located at the secondary constriction of chromosom No.18. These specific distribution of C-bands and relative to karyotype evolution of Martes foina intermedia were discussed.

Liu Ruiqing,Chen Yuze,Shi Liming,

动物学研究 , 1994,
Abstract: This paper deals with the comparison on karyotypes between red goral (Naemorhedus cranbrooki) and goral(Naemorhedus goral griseus).Their chromosomes were studied by several banding techniques(G-,C-and Ag-staining).These results are given as below:(1) The diploid number of red goral(N.cranbrooki) is 56.All of the chromosomes are acrocentrics.The X is a large one, and the Y,the smallest.The goral(N.g.griseus)has a dipolid number of 2n=54.The karyotype are consisted of 26 pairs of acrocentrics and one pair of submetacentric.The X chromosome is also a large acrocentric,and the Y chromosome,the smallest acrocentric.Therefor,the existence of submetacentric elements makes the remarkable difference between the chromosomal structures of red goral and goral.But autosomal arm number(N.F) are all 54 for both gorals.(2)The G-banding patterns of the 3q in goral are similar to that of the No.3 in red goral,and the G-banding patterns of the 3p in goral are similar to that of the No.27 in red goral.Therefore,it is suggested that a Robertsonian translocation could have happened during the karyotype evolution of gorals.(3)The centromeric distribution of heterochromatin has been demonstrated in all chromosomes of red goral and goral,while the whole Y chromosome is C-band positive.The C-bands of chromosomes are also similar for both gorals.(4) Ag-NORs have been observed at the terminal of 3 pairs of acrocentrics in red goral and goral,which could be No.l,2 and 4 larger acrocentrics according to their size and morphology.These results suggest a close relationship between red goral (N.cranbrooki) and goral (N.g.griseus).

Chen Zhiping Wang Yingxiang Lin Ruiqing Shi Linming,

动物学研究 , 1992,
Abstract: This paper deals with the comparicon of C-banding pattorns of all Rattas specics(8 speces) in China. And there are some differences among theis C-banded karyotypes . The cvolution of C-banding patterns of 8 spceics of rats has been studied, and the following tactors maybe facilitate karyotypic variability, loss of centromeric heterochromatin, interstitial heterochromatin, terminal hclcroch-romatin and hcterochromatic arms. Based on the different characteristics of C-banded karyotypes. R, yunn-anensis ,R. sikkimmensis and R. turkcstanicus may be classified into three independent species. Moreover, a cluster dendrogram has been presented in this paper by the fuzzy aggregation. It shows that these 8 species are able to diviele into two groups:R. rattus sladeni R. sikkimensis for the first group and R. fluvipectus, R. yunnancnsis. R. nitidus, R. losca, R. turkestanicus and R, norveyicns for the sccond.

LIU Ruiqing SHI Liming CHEN Yuze,

动物学研究 , 1987,
Abstract: The chromoeomes and nucleoli, micronucleoli in prophase of oocytes from human fcotal were studied by Giemsa and silver-staining.There arc profound changes of epiralization, despiralization, respiralization, redespiralization in the chromosomal morphology from preleptotene, diplotene, to dictyotone. The bivalents are uncoiled, extremely extended in dictyotene stage, and morphologically they arc "lampbrush-like". The morphology and number of primary nucleoli, micronucleoli. as well as silver-tained small clots in various stages of prophase are also described.
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