Results 21 to 30 of about 2,581,993 (313)

Summer aspect of phytoplankton communities in some Montenegrin lakes: Are there changes after more than two decades? [PDF]

open access: yesArchives of Biological Sciences, 2012
Qualitative and quantitative phytoplankton compositions of 10 Montenegrin lakes were investigated in the summer of 2007. The obtained results were compared with a previous study-period that was undertaken two decades ago.
Rakočević Jelena
doaj   +1 more source

Synthesis and Characterization of Cross-Linked Polymer–Silica Composite Particles with Multi-Functional Groups

open access: yesMaterials Proceedings, 2023
Two types of core-shell composite particles, each comprising an aromatic poly(esteramide) (PEA) having amide and hydroxyl groups combined with silica (SiO2), were synthesized.
Yayoi Yoshioka
doaj   +1 more source

Space functions of groups [PDF]

open access: yesTransactions of the American Mathematical Society, 2012
We consider space functions s ( n ) s(n)
openaire   +3 more sources

Harvested Microalgal Biomass from Different Water Treatment Facilities—Its Characteristics and Potential Use as Renewable Sources of Plant Biostimulation

open access: yesAgronomy, 2020
Surface characteristics, physicochemical properties, functional groups, and bioactive compounds of microalgal biomass (MB) samples harvested from various wastewater treatment facilities (WTFs) were investigated to evaluate the reuse feasibility of MB as ...
Chang Hyuk Ahn   +4 more
doaj   +1 more source

Functional Groups Detection: Do Chemistry Teachers Demonstrate Conceptual Difficulties in Teaching?

open access: yes, 2021
The chemistry chief examiner of the West African Examination Council has complaint a lot about the weak performance of students on organic chemistry including functional group detection The study therefore investigated whether senior high school ...
Benjamin Anim-Eduful, Kenneth Adu-Gyamfi
core   +2 more sources

Degradation of quinone-based flow battery electrolytes: Effect of functional groups on the reaction mechanism

open access: yes, 2022
Organic redox flow batteries are a promising technology for grid-scale energy storage from renewable energy resources. However, the chemical instability of the organic electrolytes prohibits wide-scale commercial implementation as energy storage ...
Tejs, Vegge   +3 more
core   +1 more source

Growth Functions and Automatic Groups [PDF]

open access: yesExperimental Mathematics, 1996
In this paper we study growth functions of automatic and hyperbolic groups. In addition to standard growth functions, we also want to count the number of finite graphs isomorphic to a given finite graph in the ball of radius n around the identity element in the Cayley graph. This topic was introduced to us by K. Saito [1991].
Epstein, David B. A.   +2 more
openaire   +2 more sources

Using an affinity analysis to identify phytoplankton associations

open access: yesEcology and Evolution, 2022
Phytoplankton functional traits can represent particular environmental conditions in complex aquatic ecosystems. Categorizing phytoplankton species into functional groups is challenging and time‐consuming, and requires high‐level expertise in species ...
Weiju Zhu   +3 more
doaj   +1 more source

The Dehn Function of Stallings’ Group [PDF]

open access: yesGeometric and Functional Analysis, 2009
We prove that the Dehn function of a group of Stallings that is finitely presented but not of type F_3 is quadratic. To appear in Geometric and Functional Analysis.
Dison, Will   +3 more
openaire   +5 more sources

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