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Articles by F. Chen
Total Records ( 5 ) for F. Chen
  X.F. Yang , Z.Y. Jiang , X.Y. Ma , C.T. Zheng , Y.C. Lin , S.K. Wang , S.Q. Jiang , F. Chen and G.L. Zhou
  The pork industry is dedicating to provide fast-growing pigs with high-grade meat; this study aimed to explore the relationship between dietary energy and growth output. Thirty two individually-penned male Lantang pigs (initially weighed 20.21±0.63 kg) were randomly assigned to one of four dietary treatments, with 4 replicates of 2 pigs each. The Digestive Energy (DE) of T (treatment) 1~4 were 9.24, 11.02, 12.66 and 14.29 MJ kg-1 feed, respectively. Feeding trail was terminated when all pigs within a treatment averaged 60±2 kg b.wt. and all pigs were slaughtered. The feeding time to reach terminal b.wt. were longer in both T1 and T2 in contrast with T3 and T4 (p<0.01). Average daily energy intake increased linearly with dietary energy concentration (p<0.01). Compared with the other three groups, average daily gain (p<0.05) and feed to gain ratio (p<0.05) of T4 were significantly increased and decreased, respectively. Relative contents of major white fat and perinephric fat, as well as adipocyte size of T4 were higher than those of the other groups (p<0.05). These results indicated that increasing dietary energy content improved fat accumulation in Lantang growing pigs possibly through direct deposition of fat in adipocyte. Higher content of dietary energy tend to increase growth rate of the pig, yet the over-deposition of body fat as well as its possible impact on carcass quality and marketing profit need to be further explored.
  L. Bai , F. Chen and X. Zeng
  In this study, for depth information estimation of microscope defocus image, a blur parameter model of defocus image based on Markov random field has been present. It converts problem of depth estimation into optimization problem. An improved Iterated Conditional Modes Algorithm has been applied to complete optimization problem, which the select of initial point employed Least squares estimate algorithm prevents that the result gets into local optimization. The experiments and simulations prove that the model and algorithm is efficiency.
  J. Liu , J. Hua , B. Liu , F. Chen and L. Meng
  With the rapid development of wireless communications, there will be many communication standards in the future, which may cost much to buy the corresponding vector microwave signal generator. Hence, this study investigated a novel vector microwave signal generation method, which modeled the vector baseband signal by the CAD software (Agilent ADS) and then control the conventional microwave signal generation hardware to output vector microwave signals. Compared with the specified vector microwave signal generator developed by Agilent, Anritsu, etc., our software-controllable microwave signal source is cheaper, more flexible and more convenient. Moreover, as an application of our method, we model and realize the TD-SCDMA baseband signal corrupted by multipath channel and Additive White Gaussian Noise (AWGN) in ADS software and then control the hardware (Agilent E4432B) to generate the TD-SCDMA microwave signals. The measurements of the TD-SCDMA microwave signals approve the validity of our method.
  F. Chen , J. Li , H. Sugiyama , Y.B. Weng , F.C. Zou , R.Q. Lin , Z.G. Yuan , H.Q. Song , X.Q. Zhu and G.H. Zhao
  In the present study, a portion of the 18S and 28S ribosomal DNA (rDNA) sequences of 35 Schistosoma japonicum isolates representing three geographical strains from mainland China, the Philippines and Japan were amplified and compared and phylogenetic relationships were also reconstructed by Unweighted Pair-Group Method with Arithmetic averages (UPGMA) using combined 18S and 28S rDNA sequences as well as the corresponding sequences of other species belonging to the Schistosoma genus available in the public database. The results indicated that the partial 18S and 28S rDNA sequences of all S. japonicum isolates were 745 and 618 bp, respectively and displayed low genetic variation among S. japonicum strains and isolates. Phylogenetic analysis revealed that the combined 18S and 28S rDNA sequences were not able to distinguish S. japonicum isolates from three geographical origins but provided an effective molecular marker for the inter-species phylogenetic analysis and differential identification of different Schistosoma species.
  F. Chen , J. Zhang , A. Aoyama , T. Okamoto , T. Fujinaga and T. Bando

Objective: A method to compensate for the donor shortage may be the utilization of donation after cardiac death. The control of lung injury against warm ischemia is crucial in manipulating donors after cardiac death. Nebulization is a simple and feasible drug delivery route after cardiac death. Herein we have examined the potential effect of nebulized milrinone, a phosphodiesterase III inhibitor, on pulmonary warm ischemia.

Materials and Methods: Deeply anesthetized rats were euthanized by exsanguination. Lungs were exposed to warm ischemia with ventilation up to 2 hours. Milrinone was nebulized for 10 minutes at the beginning of warm ischemia (n = 5). In the control group (n = 5), normal saline was nebulized for the same time. At given intervals, the lungs were partially resected to measure adenine nucleotide and cyclic adenosine monophosphate levels.

Results: In both groups, lung tissue cyclic adenosine monophosphate levels decreased significantly at 2 hours after warm ischemia; however, there was no significant difference between the groups. Lung tissue adenosine triphosphate levels significantly decreased at 2 hours after ischemia in the control group, while they did not drop up to 2 hours in the milrinone group. Further, lung tissue adenosine triphosphate levels at 2 hours after ischemia were higher in the milrinone group than the control group.

Conclusions: Our results confirmed that milrinone nebulization during warm ischemia maintained lung tissue adenosine triphosphate levels. Therefore, milrinone nebulization may have potential for lung protection against warm ischemia.
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