Fajun Chen

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Transgenic rice expressing Bacillus thuringiensis (Bt) endotoxins (Bt rice) for pest control is considered an important solution to food security in China. However, tests for potential effects on non-target soil organisms are required for environmental risk assessment. The soil collembolan Folsomia candida L. (Collembola: Isotomidae) is a potential(More)
Here we report the effects of three Bt-rice varieties and their non-Bt conventional isolines on biological traits including survival, reproduction, and the activities of three antioxidant enzymes superoxide dismutase, catalase and peroxidase, in the Collembolan, Folsomia candida. The reproduction was significantly lower when fed Kemingdao and Huahui1 than(More)
Nicotinic acetylcholine (ACh) receptors (nAChRs) are ligand-gated ion channels which mediate fast cholinergic synaptic transmission in insect and vertebrate nervous systems. The nAChR agonist-binding site is present at the interface of adjacent subunits and is formed by loops A-C present in alpha subunits together with loops D-F present in either non-alpha(More)
Field-OTC experiments were conducted with the goals of ascertaining if increased biomass in Bt transgenic cotton and rice grown under elevated CO(2) results in diminished exogenous-Bt toxin, and assessing the effectiveness of Bt transgenes against lepidopteran pests. Bt cotton responded differently, in terms of Bt-toxin quantity, than Bt rice, and both(More)
Virus-vector relationships can be complex and diverse as a result of long-term coevolution. Understanding these interactions is crucial for disease and vector management. Rice stripe virus (RSV) is known to be transovarially transmitted within its vector, Laodelphax striatellus, and causes serious rice stripe disease. In RSV-infected L. striatellus, we(More)
This paper studies the distributed caching managements for the current flourish of the streaming applications in multihop wireless networks. Many caching managements to date use randomized network coding approach, which provides an elegant solution for ubiquitous data accesses in such systems. However, the encoding, essentially a combination operation,(More)
Chilo suppressalis and Sesamia inferens are two important lepidopteran rice pests that occur concurrently during outbreaks in paddy fields in the main rice-growing areas of China. Previous and current field tests demonstrate that the transgenic rice line Huahui 1 (HH1) producing a Cry1Ab-Cry1Ac hybrid toxin from the bacterium Bacillus thuringiensis reduces(More)
A novel flight simulator is developed which allows insects to fly actively for up to several hours in any horizontal direction, while their fall migratory flight direction can be recorded uninterruptedly. In the process of data collection and process, the CamShift algorithm combined with MFC (Microsoft Foundation Class) were used and virtual trajectory was(More)
BACKGROUND The approval of transgenic Bacillus thuringiensis (Bt) rice by China was momentous for biotech crops, although it has yet to be approved for commercial production. Non-target pest problems in rice paddies, such as the three ecologically similar species of planthoppers Nilaparvata lugens, Laodelphax striatellus and Sogatella furcifera, could(More)
The choice of features or attributes used to represent patterns in the synthesis of pattern classiiers using machine learning algorithms has a strong impact on the accuracy of the classiier, the number of examples needed to attain a given classiication accuracy on test data, the cost of classiication, and the com-prehensibility of the learned classiier.(More)