Results 171 to 180 of about 958,519 (249)

Identifying and characterising a plant GH1 β‐glucosidase that exhibits hydrolytic activity on N‐linked glucopyranoside

FEBS Open Bio, EarlyView.
We report the first β‐glucosidase with demonstrated hydrolytic activity on an N‐linked glycopyranoside. The enzyme, native to maize, was biochemically characterised for this novel reaction, and structural modelling of the enzyme–substrate complex revealed several clues to the underlying reduced catalytic rate relative to its native O‐glycopyranoside ...
Hani Gharabli, Carlotta Chiesa, Maher Abou Hachem, Ditte Hededam Welner   +3 more
wiley   +1 more source

Structural studies and functional engineering of NanX: an anhydro‐sialic acid transporter from Escherichia coli

FEBS Open Bio, EarlyView.
Biophysical characterisation shows that NanX, a membrane transport protein from the major facilitator superfamily (MFS), forms both monomers and dimers after purification. AlphaFold modelling and substrate docking provide information on residues likely involved in substrate recognition for NanX and another MFS member, NanT.
Michael C. Newton‐Vesty, Kelsi R. Hall, Zachary D. Tillett, Liam S. Turk, James S. Davies, Michael J. Currie, Hamish G. Brown, Sepideh Valimehr, Peter D. Mace, Andrew E. Whitten, Santosh Panjikar, Eric Hanssen, Rachel A. North, Renwick C.J. Dobson   +13 more
wiley   +1 more source

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Medium Access Control Protocols for Power Line Communication: A Survey

IEEE Communications Surveys and Tutorials, 2019
In the literature, the majority of research efforts in power line communication (PLC) has been focused on the physical layer in order to deal with issues such as the time varying behavior of loads in electric power systems, the presence of high power ...
R. M. de Oliveira, A. Vieira, H. Latchman, Moises Vidal Ribeiro   +3 more
semanticscholar   +3 more sources

Medium Access Control

Communication Protocols, 2020
At first the mode of information interchange in classical local area networks via a common transmission medium is discussed and the need for the medium access control is pointed out. Then the peculiarities of the message transfer in local area networks are described.
D. Hercog
semanticscholar   +3 more sources

IEEE Standard for Information Technology--Telecommunications and Information Exchange between Systems--Local and Metropolitan Area Networks-Specific Requirements--Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications - Amendment 3: Wake-Up Radio Operation

IEEE Std 802.11ba-2021 (Amendment to IEEE Std 802.11-2020 as amendment by IEEE Std 802.11ax-2021, and IEEE Std 802.11ay-2021), 2021
This amendment defines modifications to both the IEEE 802.11 physical layer (PHY) and the IEEE 802.11 medium access control (MAC) sublayer for wake-up radio operation.

semanticscholar   +1 more source

Medium Access Control Protocols for Flying Ad Hoc Networks: A Review

IEEE Sensors Journal, 2021
Recently, flying ad hoc networks (FANETs) have been broadly applied to various civilian and military applications. Medium access control (MAC) protocols have attracted significant attention because of their impact on overall network performance. Owing to
Muhammad Yeasir Arafat, Sabitri Poudel, Sangman Moh   +2 more
semanticscholar   +1 more source

IEEE Standard for Broadband over Power Line Networks: Medium Access Control and Physical Layer Specifications Amendment 2: Enhancements for Authentication and Authorization

IEEE Std 1901b-2021 (Amendment to IEEE Std 1901-2020), 2022
State-of-the-art authentication and authorization mechanisms for networks, especially for IoT and access devices, are integrated in this amendment. Specifications for how IEEE Std 802.1X may be utilized for authentication and authorization by IEEE 1901 ...
Jean-Philippe Faure, Markus Rindchen, David Naughton, K. Cheng, Naohiro Kawabata, E. Mayer, Makato Hirano, H. Koga, Ryo Sakaji, Stephen R. Horvath, C. Scott, Gary Hoffman, J. Rosdahl, Vice Chair, John D. Kulick, Edward A. Addy, Doug Edwards Ramy, A. Fathy, J. Travis, Griffith Thomas Koshy, Joseph L. Koepfinger, David J. Law, Howard Li, Dao-Zhuang Lin, Kevin Lu, Daleep C. Mohla, Chen-Hui Niu, D. Novosel, Annette D. Reilly, Dorothy V. Stanley, Karl Weber, Sha Wei, Howard Wolfman, Dai-Di Zhong   +33 more
semanticscholar   +1 more source

Medium Access Control Under Space-Time Coupling in Underwater Acoustic Networks

IEEE Internet of Things Journal, 2021
The long propagation delay presents a nonnegligible impact on medium access control (MAC) in underwater acoustic networks (UANs), leading to the coupling of spatial propagation delay and transmission time in determining frame collisions at receivers.
Weiqi Chen, Quansheng Guan, Hua Yu, Fei Ji, Fang-Jiong Chen   +4 more
semanticscholar   +1 more source

Medium access control in VANET

2017 Sixth International Conference on Communications and Networking (ComNet), 2017
Vehicular Ad hoc Network (VANETs) help improve efficiency of security applications and road safety. Using the information exchanged between vehicles, the latter can warn drivers about dangerous situations. Detection and warning about such situations require reliable communication between vehicles. In fact, the IEEE 802.11p (WAVE: Wireless Access in the
Narjes Boulila, Leïla Azouz Saïdane
openaire   +2 more sources

Medium Access Control

2010
The MAC layer implements a number of coordination functions, which are responsible for controlling wireless channel access. The distributed coordination function (DCF) and point coordination function (PCF) are covered. The hybrid coordination function (HCF) from the 802.11e is also discussed.
Alan Holt, Chi-Yu Huang
openaire   +2 more sources