Results 51 to 60 of about 4,061 (261)

pH‐mediated activation of the lysosomal arginine sensor SLC38A9

FEBS Letters, EarlyView.
Cells monitor nutrient levels via the lysosomal transporter SLC38A9 to activate the mechanistic target of rapamycin complex 1 (mTORC1). This study reveals that SLC38A9 function is regulated by pH. We identified histidine 544 as a critical pH sensor that undergoes conformational changes to control amino acid efflux from lysosomes; therefore, it ...
Xuelang Mu, Ampon Sae Her, Tamir Gonen
wiley   +1 more source

The ubiquitin‐proteasome system and autophagy as guardians of the cellular proteome

FEBS Letters, EarlyView.
This Perspective covers the three principles governing the crosstalk between the ubiquitin‐proteasome system and autophagy in cellular proteostasis: (1) a shared ubiquitin code routing substrates via shuttle factors or autophagy receptors; (2) spatial compartmentalization into phase‐separated degradation hubs and organelle‐specific modules (exemplified
Ivan Dikic
wiley   +1 more source

Economies in U.S. demand responsive transit

Journal of Advanced Transportation, 1987
AbstractThis paper develops a neoclassical cost function for demand responsive transit (DRT) system and uses it to test the economies of scale hypothesis. The results show economies of scale and further show that the economies can be explained by speed, local and state subsidies, utilization of seating capacity, fleet utilization and an increase in the
openaire   +1 more source

Dynamic Scheduling of Electric Demand Responsive Transit Considering Time-of-Use Pricing

Journal of Advanced Transportation
Demand-responsive transit (DRT) has been widely adopted in many cities worldwide due to its advantages of flexible routing and personalized services.
Jiadong Wang, Zhenzhou Yuan, Zhenying Yan, Meiying Jian, Feng Hao   +4 more
doaj   +1 more source

Flex-Route Transit for Smart Cities: A Reinforcement Learning Approach to Balance Ridership and Performance

Smart Cities
A major challenge for modern transit systems relying on traditional fixed-route designs is providing broad accessibility to users. Flex-route transit can enhance accessibility in low-density areas, since it combines the directness of fixed-route transit ...
Joseph Rodriguez, Haris N. Koutsopoulos, Jinhua Zhao   +2 more
doaj   +1 more source

Performance analysis and fleet requirements of automated demand-responsive transport systems as an urban public transport service

International Journal of Transportation Science and Technology, 2018
The introduction of public transport services by fully automated vehicles can potentially change the way public transit services will be operated, as they allow shifting from rigid scheduled and route-bound services towards flexible, demand-responsive ...
Konstanze Winter, Oded Cats, Gonçalo Correia, Bart van Arem   +3 more
doaj   +1 more source

From mice to humans—divergent strategies for intestinal homeostasis and regeneration

FEBS Letters, EarlyView.
Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa, Shinya Sugimoto, Toshiro Sato   +2 more
wiley   +1 more source

Feeding Urban Rail Transit: Hybrid Microtransit Network Design Based on Parsimonious Continuum Approach

Information
In recent years, the passenger flow volume of conventional transit in major cities has declined steadily. Ground public transit often suffers from congestion during rush hours caused by frequent stops (e.g., conventional fixed-route buses) or excessively
Qian Ye, Yunyu Zhang, Kunzheng Wang, Xinghua Liu, Chunfu Shao   +4 more
doaj   +1 more source

Iterated clustering optimization of the split-delivery vehicle routing problem considering passenger walking distance

Transportation Research Interdisciplinary Perspectives, 2023
The user-oriented, demand-driven nature of customized shuttle bus (CSB) services forces operators to pay more attention to service quality. However, the bus route planning of CSB and other similar systems in established studies rarely took service ...
Jiangbo Wang, Zhirui Lian, Chao Liu, Kai Liu   +3 more
doaj   +1 more source

Phosphoinositides and inositol phosphates as molecular glues

FEBS Letters, EarlyView.
Inositol phosphates (IPs) and phosphoinositides (PIPs) regulate diverse eukaryotic processes. Beyond recruiting signaling proteins or acting as structural cofactors, recent studies suggest they mediate protein–protein interactions as natural molecular glues.
Aleshia Seaton‐Terry, Alexander J. Cutright, Mong Na Claire Loi, Jessica Martin, Joseph W. Gilligan, Jakub N. Kubina, Michael J. Arambula, Susanna Tanada Palmu, Daniella Zhou, Raymond D. Blind   +9 more
wiley   +1 more source