Article
Multidisciplinary Sciences
Li Long, Lv You, Dan Wang, Ming Wang, Junhua Wang, Guihuan Bai, Jianhua Li, Xiaoyu Wei, Shijun Li
Summary: This study investigated the antimicrobial resistance, presence of antimicrobial resistance genes and virulence genes, and MLST genotypes of Salmonella enterica serovar 4,[5],12:i:- isolates from Guizhou province, China. The results showed that the isolates displayed high resistance to multiple antibiotics and carried various antimicrobial resistance genes and virulence genes. The study provided important information on Salmonella enterica serovar 4,[5],12:i:- infections in humans from Guizhou province.
Article
Agriculture, Dairy & Animal Science
Xue Fu, Lan Feng, Linghan Kong, Chun Li, Xiaodong Zhao, Huade Li, Pengfei Cui, Wenjun Yan, Yaru Zhai, Lan Zhang, Hao Li, Hongning Wang, Xin Yang
Summary: The study investigated the prevalence of Salmonella Derby in yak farms in the Qinghai-Tibetan Plateau, demonstrating its high pathogenicity to mice. Findings suggest that Salmonella Derby excreted by diarrheic yaks could be a source of contamination for other yaks and the environment.
Article
Microbiology
Konstantin V. Kuleshov, Anastasia S. Pavlova, Elizaveta D. Shedko, Yulia V. Mikhaylova, Gabriele Margos, Sabrina Hepner, Igor V. Chebotar, Elena V. Korneenko, Alexander T. Podkolzin, Vasiliy G. Akimkin
Summary: This study reports the first three cases of mcr gene-carrying non-typhoid Salmonella isolates in Russia, with both outbreak and sporadic epidemiological backgrounds. Three colistin-resistant isolates were identified, with two carrying mcr-1.1 gene and one carrying mcr-9 gene on different plasmids.
Article
Microbiology
Honghu Chen, Jingjie Song, Xianying Zeng, Rongchang Chen, Chen Qiu, Kai Zhou
Summary: A retrospective screening was conducted in China to understand the national prevalence of ciprofloxacin-resistant S. Kentucky, revealing the spread of multidrug-resistant ST198 strains in five provinces and suggesting diverse origins for the Chinese isolates. This study highlights the necessity of surveillance for the high-risk clone to prevent further dissemination in China.
Review
Food Science & Technology
Ryan Pearce, Beate Conrady, Luca Guardabassi
Summary: The objective of this study was to assess the prevalence and types of extended-spectrum β-lactamase (ESBL)-producing bacteria in retail seafood. A literature review found that the median prevalence of ESBL-contaminated products globally was 19.4%, with significantly higher rates in Asia compared to Europe and Africa. Among the analyzed isolates, 44.8% were ESBL-positive, with CTX-M being the predominant type (93.6%).
Article
Microbiology
Bai Wei, Se-Yeoun Cha, Ke Shang, Jun-Feng Zhang, Hyung-Kwan Jang, Min Kang
Summary: The study identified the transmission of ESC resistance determinants in E. coli and Salmonella within the same chicken, with most E. coli isolates carrying bla(CTX-M-55) or bla(CMY-2) and most Salmonella isolates carrying bla(CTX-M-15). Two broiler chicken farms were found to harbor both bla(CMY-2)- and bla(CTX-M-15)-harboring E. coli and Salmonella isolates.
VETERINARY MICROBIOLOGY
(2021)
Article
Microbiology
Lester Hiley, Rikki M. A. Graham, Amy V. Jennison
Summary: This study identified two genes possibly associated with change of phage type in IncI1 plasmids. IncI1 plasmids were classified as either 'Delta' or 'Col' plasmids, and genetic recombination leading to a switch between Delta and Col gene sets was observed at the rfsF site. Widespread distribution of these plasmids with extensive regions showing high sequence identity was also indicated.
Article
Microbiology
Chenyang Cao, Qinya Niu, Jia Chen, Xuebin Xu, Huanjing Sheng, Shenghui Cui, Bin Liu, Baowei Yang
Summary: The study analyzed 292 clinical isolates of S. Enteritidis in Shanghai between 2006 and 2014, showing a high frequency of cefotaxime-resistant isolates with CTX-M-55 being the most prevalent genotype. The findings highlight the importance of monitoring CTX-M-55 and using cephalosporins, especially cefotaxime, cautiously in empirical treatment for Salmonella infections.
Article
Public, Environmental & Occupational Health
Suhaila A. Al-Sheboul, Ghina S. Al-Madi, Brent Brown, Wail A. Hayajneh
Summary: The prevalence of Klebsiella pneumoniae infections caused by antimicrobial resistance is increasing globally. In this study, K. pneumoniae producing ESBLs were investigated in samples from hematologic malignancy individuals, indicating a high prevalence of ESBL-producing K. pneumoniae.
JOURNAL OF EPIDEMIOLOGY AND GLOBAL HEALTH
(2023)
Article
Microbiology
Cong Shen, Furong Ma, Suiyan Deng, Lan-Lan Zhong, Mohamed Abd El-Gawad El-Sayed Ahmed, Guili Zhang, Bin Yan, Min Dai, Fan Yang, Yong Xia, Guo-Bao Tian
Summary: The prevalence of mcr-1-positive Salmonella from different sources was low, with horizontal transfer of IncHI2-pST3 plasmid being the main mode of transmission. Clonal transmission was not the main reason for the expansion of mcr-1-positive Salmonella.
INTERNATIONAL JOURNAL OF MEDICAL MICROBIOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Golshan Shakeri, Jens A. Hammerl, Abdollah Jamshidi, Kiarash Ghazvini, Manfred Rohde, Istvan Szabo, Corinna Kehrenberg, Madeleine Plotz, Sophie Kittler
Summary: This study isolated and characterized six bacteriophages that infect food-derived Salmonella isolates, with phage VB_StyS-LmqsSP1 showing the potential for biocontrol by suppressing Salmonella growth and reducing bacterial titer. The phage demonstrated lytic efficacy under conditions prevalent in food production environments, making it a promising candidate for controlling Salmonella contamination on poultry.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2021)
Review
Biotechnology & Applied Microbiology
Saumya Darshana Patra, Nirmal Kumar Mohakud, Rakesh Kumar Panda, Bikash Ranjan Sahu, Mrutyunjay Suar
Summary: This review discusses the epidemiology and multidrug resistance of Salmonella Typhimurium in 11 countries of South East Asia. Vietnam ranks top in terms of prevalence and antimicrobial resistance, while some countries such as Brunei and Timor Leste have not conducted studies on the incidence and drug resistance of this pathogen. Despite not being the dominant serovar in the region in the past 20 years, evidence suggests that Salmonella Typhimurium remains a major threat in South East Asia due to infection in humans and contamination in animals and food sources, as well as its resistance to multiple antibiotics.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2021)
Article
Infectious Diseases
Zengfeng Zhang, Xiaorong Tian, Chunlei Shi
Summary: This study investigated the global prevalence and molecular characteristics of mcr-producing Salmonella isolates. The results showed that mcr-positive Salmonella strains were widely distributed in different countries and regions, with human samples, foods, animals, and the environment being the main sources. Typhimurium and 1,4,[5],12:i:- were the most common serotypes, and various mcr variants were identified. The presence of other resistance genes and international spread were also observed. These findings highlight the further challenges posed by the dissemination of Salmonella carrying mcr genes.
Article
Biotechnology & Applied Microbiology
Yezhi Fu, Nkuchia M. M'ikanatha, Jeffrey M. Lorch, David S. Blehert, Brenda Berlowski-Zier, Chris A. Whitehouse, Shaoting Li, Xiangyu Deng, Jared C. Smith, Nikki W. Shariat, Erin M. Nawrocki, Edward G. Dudley
Summary: Salmonella enterica serovar Typhimurium isolates from wild birds in the United States exhibit distinct lineages and virulence gene signatures, indicating host adaptation. These isolates are genetically different from those originating from domestic animal sources and can be attributed to wild birds with improved accuracy using genomic data and machine learning classifiers. The findings highlight the importance of wild birds as reservoirs of S. Typhimurium and provide valuable information for source attribution and epidemiological surveillance.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Food Science & Technology
Rui Dong, Xiaojie Qin, Shoukui He, Xiujuan Zhou, Yan Cui, Chunlei Shi, Yiping He, Xianming Shi
Summary: The study revealed that DsrA plays a crucial role in promoting oxidative stress resistance in S. Typhimurium by regulating the expression of antioxidant enzymes and maintaining intracellular redox balance.
Article
Engineering, Electrical & Electronic
Kevin Kipruto Mutai, Hiroyasu Sato, Qiang Chen
Summary: This letter introduces a leaky-wave focusing antenna with a tapered dielectric constant distribution. The structure's main appeal lies in the simplicity and low cost of achieving the tapering in the fabrication process, where three-dimensional printing is used with polylactic acid material in less than an hour. The paper presents a detailed design method and demonstrates the desired focusing effect through simulation and experimental results at Ku-band.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Xianbo Cao, Qiang Chen, Toru Tanaka, Masaki Kozai, Hiroya Minami
Summary: A 1-bit time-modulated reflectarray (TMRA) was designed based on a conventional 1-bit reflectarray and time modulation technology. Experimental verification showed that the proposed 1-bit TMRA can achieve additional time modulation characteristics without significantly increasing system complexity, making it suitable for existing wireless communication systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Xianbo Cao, Hiroyasu Sato, Kai-Da Xu, Wen Jiang, Shuxi Gong, Qiang Chen
Summary: Wireless power transfer technology has played a crucial role in the development of biomedical devices. A systematic method to improve the efficiency of wireless power transfer is proposed, which includes the application of a Fresnel zone plate and an air layer-artificial matching layer to reduce propagation loss and interface reflection. Simulation and experimental results demonstrate that the proposed method significantly enhances the efficiency of wireless power transfer.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Wenyi Shao, Qiang Chen
Summary: In this letter, a rotationally reconfigurable single-element prism compatible with the typical Risley prism antenna system is proposed. It uses a pair of rotating decentered phase plates operating at 30 GHz to continuously change the equivalent prism angle between 0 degrees and 14 degrees. An all-dielectric low-cost prototype is designed, fabricated, and measured, achieving a peak realized gain of 21 dBi with a gain variation less than 0.9 dB within the reconfigurable angle range of 0 degrees -14 degrees. Additionally, the phase distribution combination of the two rotating phase plates can be used for two-dimensional beam scanning without relying on the first-order paraxial approximation.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Takuya Kaji, Hiroyasu Sato, Qiang Chen, Shimpei Nagae, Akira Kumagai, Osamu Kagaya
Summary: This article proposes a leaky wave antenna with a dielectric superstrate (LWADS) on a perforated dielectric spacer. The LWADS has an asymmetric structure with a half-filled dielectric spacer and a non-filled spacer, creating a quasi-cutoff region. The beam direction of the leaky wave is controlled by changing the hole radius of the periodically perforated, half-filled dielectric spacer. Measurements at X-band confirm the effectiveness of the design, demonstrating a high gain tilted beam pattern with peak gains of 14 dBi at theta = 20 degrees, 40 degrees, and even at a wide-angle of theta = 60 degrees. The ability to control the effective permittivity through the hole radius allows for the realization of an array of LWADS with different beam angles and a multibeam antenna with switched feeding.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Wenyi Shao, Qiang Chen
Summary: This paper proposes an all-dielectric surface focusing Mikaelian lens that achieves high-resolution focusing in the X- and Ka-band. The lens, made using 3D printing, is low-cost and exhibits excellent imaging performance in high-resolution microwave and millimeter-wave imaging, as demonstrated through numerical simulations and experiments.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Zhirui Zheng, Daotong Li, Xiaoheng Tan, Qiang Chen
Summary: This paper proposes a compact, low-profile differential dual-polarized filtenna without an external filter circuit for vehicular communications. The antenna has a compact, low-profile, simple, and symmetrical structure, consisting of four identical quarter circular patches with a pair of crossed feeding lines symmetrically and orthogonally embedded. Good filtering performance with three radiation nulls (RNs) generated without extra filtering structure is achieved, and the production mechanisms of three RNs are studied numerically. The proposed antenna is suitable for in-vehicle local area networks (WLAN), in-vehicle Wi-Fi 6E, vehicle-to-vehicle (V2V) communication and 5G vehicle-to-basestation communication applications.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Sirao Wu, Junyi Xu, Qiang Chen
Summary: This paper reports a novel omnidirectional horizontally polarized dipole antenna array with wide bandwidth and high gain operating at sub-6 GHz band. The antenna array incorporates a major improvement in the feeding method for omnidirectional radiation patterns inspired by the classic turnstile antenna array. The antenna is simply machined with 1 mm diameter copper wire and exhibits good agreement between measured and simulated results, with a measured -10 dB impedance bandwidth of 1.19 GHz and a measured peak realized gain value of 7.44 dBi.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Kevin Kipruto Mutai, Qiang Chen
Summary: In this letter, a frequency-scanning leaky-wave array antenna is proposed to achieve a significantly increased scanning range. The structure consists of a pair of rectangular-waveguide-fed leaky-wave slot array antennas, which achieve focusing in the backward and forward quadrants at 26.5 and 23 GHz, respectively. By simply changing the frequency, a total scanning range of about 73 degrees is achieved. The proposed design allows the use of a single feed for both waveguides, with the focusing gain varying between 23 and 25 dBi.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Jiapeng Zhang, Jiawen Xu, Qiang Chen, Hui Li
Summary: In this paper, a machine-learning-assisted antenna optimization method is proposed using the random forest (RF) algorithm with data augmentation (DA). By ensuring prediction and optimization accuracy with repeated DA, this method improves the AR bandwidth of a circularly polarized omnidirectional base station antenna by 41%. The proposed method outperforms other similar methods in estimation accuracy and requires fewer iterations. It is also successfully applied to multi-objective optimizations.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Zhirui Zheng, Xiaoheng Tan, Daotong Li, Mei Li, Qiang Chen
Summary: In this article, two compact dual-band substrate integrated suspended line (SISL) filtering antennas with high selectivity based on dual gap-coupled patches are proposed. The designs achieve high selectivity and deep stopband rejection by generating radiation nulls (RNs) in the stopband. Additionally, a dual-band SISL filtering antenna with broadside and bidirectional beams is realized by integrating different radiation patterns.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Daotong Li, Xiaoquan Chen, Wei Luo, Zhirui Zheng, Qiang Chen
Summary: In this paper, two compact tri-band substrate integrated waveguide (SIW) bandpass filters (BPFs) are designed with high selectivity and controllable center frequencies. By perturbing the SIW cavity with metallized vias, the resonant characteristics and flexible control of the structure are analyzed. The designed filters, one with a single-layer substrate and the other with a two-layer substrate, exhibit good out-of-band rejection and agree well with the simulated results.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Manufacturing
Daotong Li, Wei Luo, Xiaoquan Chen, Ying Liu, Kai-Da Xu, Qiang Chen
Summary: This article presents a design strategy for dual-/tri-/quad-band substrate-integrated waveguide bandpass filters based on a single perturbed multimode SIW cavity. Multiple resonant modes are achieved by loading perturbed structures in the cavity, and different filters with flexible controllable parameters are successfully realized using this approach.
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Kai-Da Xu, Xiaoyu Weng, Qiang Chen, Haijun Fan
Summary: This article presents a direct synthesis method for designing a wideband filtering switch by incorporating p-i-n diodes into each resonator. An ideal transformer is introduced in each resonator to provide freedom in selecting values for inductances and capacitances. A new circuit model extraction procedure is used to simplify the network topology, and the lumped circuit model is converted into a distributed circuit model to maintain the filtering response in a wide frequency range. The proposed method is validated through the fabrication and measurement of two filtering switches with different fractional bandwidths.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Telecommunications
Chang Ge, Sijie Xia, Qiang Chen, Fumiyuki Adachi
Summary: In a cellular system with distributed MU-MIMO, the application of cluster-wise distributed MU-MIMO reduces computational complexity but results in both intracell and intercell interference. To address this, a fully decentralized interference coordination method combining the graph coloring algorithm and deep reinforcement learning is proposed in this letter. Through online training considering the time-varying wireless environment, the joint interference coordination can quickly adapt to changes and significantly improve system capacity compared to the absence of interference coordination.
IEEE COMMUNICATIONS LETTERS
(2023)
