Results 61 to 70 of about 799,512 (292)

A Size-Function Typology of Cities [PDF]

open access: yesDemography, 1967
Resumen En este artículo se presentan las caracteristicas de un sistemaidealdeclasificación, y se desarrolla un nuevo sistema, que tiene esias características, para la clasificación de las áreas urbanas. En este nuevo sistema para la clasificación de las áreas urbanas se utiliza, como eriterios variables, tanto la función económica como ...
openaire   +2 more sources

Effect of city size on start-up lost time at signalized intersections [PDF]

open access: yesTehnika
In recent years, the degree of motorization and transport work have been expanding, while the development of infrastructure, road and street networks, has not followed their growth.
Nikolić Tijana A.   +2 more
doaj   +1 more source

C2α‐carbanion‐protonating glutamate discloses tradeoffs between substrate accommodation and reaction rate in actinobacterial 2‐hydroxyacyl‐CoA lyase

open access: yesFEBS Open Bio, EarlyView.
Enzymes of the 2‐hydroxyacyl‐CoA lyase group catalyze the condensation of formyl‐CoA with aldehydes or ketones. Thus, by structural adaptation of active sites, practically any pharmaceutically and industrially important 2‐hydroxyacid could be biotechnologically synthesized. Combining crystal structure analysis, active site mutations and kinetic assays,
Michael Zahn   +4 more
wiley   +1 more source

The Spanish spatial city size distribution

open access: yes, 2020
This paper analyses the Spanish city size distribution from a new perspective, focusing on the role played by distance. Using un-truncated data from all cities in 1900 and 2011, we study the spatial distribution of cities and how the city size ...
Rafael González‐Val
semanticscholar   +1 more source

Single‐molecule DNA flow‐stretch assays for high‐throughput DNA–protein interaction studies

open access: yesFEBS Open Bio, EarlyView.
We describe an optimised single‐molecule DNA flow‐stretch assay that visualises DNA–protein interactions in real time. Linear DNA fragments are tethered to a surface and stretched by buffer flow for fluorescence imaging. Using λ and φX174 DNA, this protocol enhances reproducibility and accessibility, providing a versatile approach for studying diverse ...
Ayush Kumar Ganguli   +8 more
wiley   +1 more source

Polycentric Spatial Structure, Urban Scale, and Land Prices: Evidence from Prefecture-Level Cities in China

open access: yesLand
In recent years, local governments in China have actively promoted new district development, encouraging a transition from monocentric to polycentric urban form.
Xiaomei Lian   +3 more
doaj   +1 more source

Does Zipf’s law hold for Polish cities?

open access: yesMiscellanea Geographica: Regional Studies on Development, 2016
In this paper we study Zipf’s law, which postulates that the product of a city’s population and its rank (the number of cities with a larger or equal population) is constant for every city in a given region.
Cieślik Andrzej, Teresiński Jan
doaj   +1 more source

Combined 5‐aminolevulinic acid and ferric ammonium citrate treatment promotes hair follicle growth by activating dermal papilla cells

open access: yesFEBS Open Bio, EarlyView.
5‐Aminolevulinic acid combined with ferric ammonium citrate (5‐ALA/FAC) stimulates dermal papilla cell activity and promotes hair follicle growth. The treatment enhances ERK and AKT signaling, increases hair‐inductive gene expression, and restores dermal papilla function suppressed by dihydrotestosterone and oxidative stress, resulting in enhanced hair
Han‐Wook Ryu, Eok‐Soo Oh, Sewoon Kim
wiley   +1 more source

Ras al‑Khaïmah, l’essor récent d’une ville moyenne du Golfe

open access: yesArabian Humanities, 2013
Ras al‑Khaimah (Ra’s al‑Khayma) refers to both one of the seven emirates forming the United Arab Emirates and the capital city of this emirate.The present article shows to which extent this port city, despite a relatively high specificity, is akin to the
Brigitte Dumortier
doaj   +1 more source

Financing public transport: a spatial model based on city size [PDF]

open access: yesEuropean Journal of Management and Business Economics, 2017
Purpose - The purpose of this paper is to investigate the relationships between public transport services and the financial needs. Cities require to be equipped with public transport networks as they are primarily responsible for creation of wealth for ...
Miguel Ruiz-Montañez
doaj   +1 more source

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