Results 61 to 70 of about 99,984 (304)

Disponibilidade de nitrato em solos brasileiros sob efeito da calagem e de fontes e doses de nitrogênio Nitrate availability in Brazilian soils under effect of liming and sources and amounts of nitrogen

open access: yesPesquisa Agropecuária Brasileira, 2000
Este trabalho objetivou avaliar os efeitos da calagem e de fontes e doses de N sobre a disponibilidade de nitrato, em amostras (020 cm) de solos brasileiros.
CARLOS ALBERTO SILVA   +1 more
doaj   +1 more source

Biomineralization in Cave Bacteria—Popcorn and Soda Straw Crystal Formations, Morphologies, and Potential Metabolic Pathways

open access: yesFrontiers in Microbiology, 2022
Caves are extreme, often oligotrophic, environments that house diverse groups of microorganisms. Many of these microbes can perform microbiologically induced carbonate precipitation (MICP) to form crystalline secondary cave deposits known as speleothems.
Keegan Koning   +8 more
doaj   +1 more source

Role of VicRKX and GlnR in pH-Dependent Regulation of the Streptococcus salivarius 57.I Urease Operon

open access: yesmSphere, 2016
Ureolysis by Streptococcus salivarius is critical for pH homeostasis of dental plaque and prevention of dental caries. The expression of S. salivarius urease is induced by acidic pH and carbohydrate excess.
Szu-Chuan Huang, Yi-Ywan M. Chen
doaj   +1 more source

Synthesis, enzyme inhibition and anticancer investigation of unsymmetrical 1,3-disubstituted ureas [PDF]

open access: yesJournal of the Serbian Chemical Society, 2014
In this research work seventeen urea derivatives, including five new derivatives N-mesityl-N'-(3-methylphenyl)urea (2), N-(3-methoxyphenyl)-N'-(3-methylphenyl)urea (4), N-mesityl-N'-(4-methylphenyl)urea (6), N-(1,3-benzothiazol-2-yl)-N'-(3 ...
Mustafa Sana   +2 more
doaj   +1 more source

Treatments on Polypropylene Macro Synthetic Fibers for Improving Adhesion in Structural Concrete Reinforcement: A Systematic Review

open access: yesJournal of Applied Polymer Science, EarlyView.
Surface functionalization of polypropylene macrofibers to enhance fiber‐matrix interfacial bonding. ABSTRACT Concrete is the most used higher compressive strength‐building material, albeit brittle to tensile, and flexural loads. Polypropylene (PP) synthetic polymeric macrofibres are commonly employed as reinforcement material to prevent this situation ...
Elena Saccani   +3 more
wiley   +1 more source

Enzyme activity in terrestrial soil in relation to exploration of the Martian surface [PDF]

open access: yes
Urease activity in soil is persistent for long periods under low water, low temperature, and sterile regimes, and it was suggested that some form of enzyme-protective mechanism exists in soil.
Ardakani, M. S.   +3 more
core   +4 more sources

Soil mineral nitrogen, soil urease activity, nitrogen losses and nitrogen footprint under machine-planted rice with side-deep fertilization [PDF]

open access: green, 2023
Jianwei Peng   +7 more
openalex   +1 more source

Rubrolides A, D, P, T, U: Total Syntheses and Antibacterial Evaluation of Highly Brominated Marine Natural Products

open access: yesChemistryEurope, EarlyView.
Following the Danube Flow. The first total syntheses of highly brominated rubrolides T, U, and U‐analog, together with the efficient and divergent syntheses of rubrolides A, D, and P. The dibrominated key intermediate, obtained via a Suzuki‐Miyaura cross‐coupling reaction, is the centerpiece of the synthesis.
Jasmin Janneschütz   +7 more
wiley   +1 more source

MICROBIOLOGICAL ACTIVITY DURING THE COMPOSTING OF WASTES FROM BROILER PRODUCTIVE CHAIN [PDF]

open access: yesEngenharia Agrícola, 2018
The quality of the carbon used as bulking agent in the composting process directly affects the dynamics of the waste degradation, which is governed by an active and diversified microbiota.
Francieli H. Bernardi   +4 more
doaj   +2 more sources

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