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1,951 results on '"ZHANG, Rongrong"'

1. Optimal Frequency in Second Messenger Signaling Quantifying cAMP Information Transmission in Bacteria

Author

Xiong, Jiarui, Wang, Liang, Lin, Jialun, Ni, Lei, Zhang, Rongrong, Yang, Shuai, Huang, Yajia, Chu, Jun, and Jin, Fan

Subjects
Physics - Biological Physics, Quantitative Biology - Molecular Networks, J.2.4
Abstract

Bacterial second messengers are crucial for transmitting environmental information to cellular responses. However, quantifying their information transmission capacity remains challenging. Here, we engineer an isolated cAMP signaling channel in Pseudomonas aeruginosa using targeted gene knockouts, optogenetics, and a fluorescent cAMP probe. This design allows precise optical control and real-time monitoring of cAMP dynamics. By integrating experimental data with information theory, we reveal an optimal frequency for light-mediated cAMP signaling that maximizes information transmission, reaching about 40 bits/h. This rate correlates strongly with cAMP degradation kinetics and employs a two-state encoding scheme. Our findings suggest a mechanism for fine-tuned regulation of multiple genes through temporal encoding of second messenger signals, providing new insights into bacterial adaptation strategies. This approach offers a framework for quantifying information processing in cellular signaling systems., Comment: 33 pages, 4 figures

Published
2024

5. Effects of zinc oxide nanoparticles pretreatment on physiological response of Lycium barbarum seedlings under salt and alkali stress

Author

ZHANG Rongrong, WANG Yanzhi, WANG Ziting, and ZHANG Baoli

Subjects
wolfberry, saline-alkali stress, zinc oxide nanoparticles (zno nps), osmotic adjustment, asa-gsh cycle, antioxidant enzyme, na+/k+ balance, Biology (General), QH301-705.5, Botany, QK1-989
Abstract

[Objective] The study aims to investigate the effects of zinc oxide nanoparticles (ZnO NPs) on wolfberry seedlings under saline-alkali stress, evaluate its physiological mechanism for alleviating saline-alkali stress, and explore its application potential and suitable concentrations. [Methods] One-year-old ‘Ningqi No. 10’ wolfberry seedlings in pots were used as materials. The roots were irrigated with ZnO NPs solutions of different concentrations (50, 100, and 150 mg/L), followed by 100 mmol/L saline-alkali stress treatment. Samples were collected after 15 and 30 days of stress treatments to measure seedling biomass, photosynthetic pigments, osmoregulatory substances, Na+ , K+ , and reactive oxygen species (ROS) content, antioxidant enzyme activity, and AsA-GSH cycle-related indicators. A comprehensive evaluation of the treatments was conducted. [Results] ZnO NPs pretreatment significantly promoted the accumulation of biomass in wolfberry seedlings under saline-alkali stress, increased leaf chlorophyll content, enhanced the content of antioxidant substances and related enzyme activities in the AsA-GSH cycle, as well as SOD, POD, and CAT activities. It significantly reduced cell membrane damage and lipid peroxidation, significantly increased the accumulation of soluble sugar, proline, and soluble protein, and regulated the Na+/K+ balance. Among the tested concentrations, 100 mg/L ZnO NPs treatment showed the best mitigation effect. [Conclusion] Root application of ZnO NPs effectively alleviates the growth inhibition of wolfberry seedlings under saline-alkali stress by promoting chlorophyll accumulation, regulating the AsAGSH cycle and antioxidant enzyme activity to efficiently scavenge excessive ROS, enhancing osmotic adjustment capacity, and maintaining Na+/K+ balance.

Published
2024
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19. On Existence Theorems for Conditional Inferential Models

Author

Zhang, Rongrong, Zhu, Michael Y., and Liu, Chuanhai

Subjects
Mathematics - Statistics Theory, Statistics - Methodology
Abstract

The framework of Inferential Models (IMs) has recently been developed in search of what is referred to as the holy grail of statistical theory, that is, prior-free probabilistic inference. Its method of Conditional IMs (CIMs) is a critical component in that it serves as a desirable extension of the Bayes theorem for combining information when no prior distribution is available. The general form of CIMs is defined by a system of first-order homogeneous linear partial differential equations (PDEs). When admitting simple solutions, they are referred to as regular, whereas when no regular CIMs exist, they are used as the so-called local CIMs. This paper provides conditions for regular CIMs, which are shown to be equivalent to the existence of a group-theoretical representation of the underlying statistical model. It also establishes existence theorems for CIMs, which state that under mild conditions, local CIMs always exist. Finally, the paper concludes with a simple example and a few remarks on future developments of CIMs for applications to popular but inferentially nontrivial statistical models.

Published
2023

20. HyBuffer: A Distributed Hybrid Shared Buffer for Multi-master Databases

Author

Zhang, Rongrong, Ye, Zhiwei, Cai, Peng, Zhou, Xuan, Zhou, Aoying, Cai, Dunbo, Qian, Ling, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Onizuka, Makoto, editor, Lee, Jae-Gil, editor, Tong, Yongxin, editor, Xiao, Chuan, editor, Ishikawa, Yoshiharu, editor, Amer-Yahia, Sihem, editor, Jagadish, H. V., editor, and Lu, Kejing, editor

Published
2024
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33. Every little makes a Mickle: the role of extracurricular activity event in leadership emergence

Author

Liu, Yuxin, Chen, Yun, Zhao, Chen, Wang, Xuefei, and Zhang, Rongrong

Subjects
College students -- Psychological aspects -- Social aspects, Student activities -- Social aspects -- Psychological aspects, Leadership -- Psychological aspects, Psychology and mental health
Abstract

The current study aims to understand the antecedent of leadership emergence from an event perspective. Drawing on event system theory and leadership literature, we examine the unique role of extracurricular activity event strength in predicting leadership self-efficacy and leadership emergence with the data from 300 undergraduates in China. Our results based on two time-lagged survey studies indicate that extracurricular activity event disruption and criticality are positively (but novelty is negatively) related to leadership self-efficacy, which in turn is positively related to leadership emergence. Moreover, leader position intensifies the effects of extracurricular activity event disruption and criticality (but not novelty) on leadership self-efficacy. The implications of these findings are discussed., Author(s): Yuxin Liu [sup.1] , Yun Chen [sup.1] , Chen Zhao [sup.1] , Xuefei Wang [sup.1] , Rongrong Zhang [sup.1] Author Affiliations: (1) https://ror.org/05khqpb71, grid.443284.d, 0000 0004 0369 4765, Business [...]

Published
2023
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