Results 81 to 90 of about 239,807 (305)

Superação da dormência de sementes de carrapicho-beiço-de-boi Dormancy overcoming in Desmodium tortuosum seeds

open access: yesPlanta Daninha, 1997
Visando a obtenção de um tratamento para acelerar a germinação de sementes de Desmodium tortuosum (Sw.) DC., foram realizados dois experimentos, nos quais, segmentos unisseminados de lomentos (testemunha) foram submetidos a debulha manual; debulha manual
Cibele C. Martins   +3 more
doaj   +1 more source

Fabry-Perot observations of comet Kohoutek [PDF]

open access: yes
Observations of H alpha, H20(+), and emission lines from comet Kohoutek were made. Analyses of H alpha line profiles and line intensities indicate that the mean outflow velocity of the hydrogen atoms was 7.8 + or - 0.2 km s(-1) and that the hydrogen atom
Huppler, D.   +4 more
core   +1 more source

lntracluster rearrangement of protonated nitric acid: Infrared spectroscopic studies of H^+(HNO_3)(H_2O)_n [PDF]

open access: yes, 1993
Infrared spectra of clusters of protonated nitric acid and water exhibit a marked change with cluster size, indicating that an intracluster reaction occurs with sufficient solvation.
Cao, Yibin   +4 more
core  

Multilocus sequence typing of the invasive pest Halyomorpha halys (Hemiptera: Pentatomidae) and associated endosymbiont reveals unexplored diversity

open access: yesInsect Science, EarlyView.
A multilocus sequence typing approach is proposed to explore Halymorpha halys genetic diversity, taking into consideration both insect nuclear markers and markers from the gut symbiont “Candidatus Pantoa carbekii.” Increased information was revealed regarding the number of distinct holobiont haplotypes in native and invasive populations of the pest ...
Matteo Dho   +6 more
wiley   +1 more source

Pteridines, LXXXVIII. Oxidations and Reactions of 2- and 4-Thiolumazine Derivatives. Synthesis and Properties of Pteridine-Sulfinates and -sulfonates

open access: yesPteridines, 1989
Selective oxidations of 2-thiolumazines (10-12) by H20 2 and KMn04 respectively in basic medium led to the corresponding stable pteridin-4-one-2-sulfinates (13-15) and -sulfonates (16-18), which can be isolated in the form of their potassium salts.
Bartke Michael, Pfleiderer Wolfgang
doaj   +1 more source

Refining the Vertebrate Mitochondrial 12S rRNA Secondary Structure by Comparative Analysis

open access: yesIntegrative Zoology, EarlyView.
This flowchart outlines the comprehensive workflow of the study, integrating diverse bioinformatics tools (e.g., NCBI2GO, SSU‐align, bpRNA) and their sequential interactions. Key steps, such as data preprocessing, structural prediction, and evolutionary analysis, are depicted with their respective outputs (e.g., standardized records, consensus ...
Fengxia Li   +6 more
wiley   +1 more source

Aplicación de Antagonistas Microbianos para el Control Biológico de Moniliophthora roreri Cif & Par en Theobroma cacao L. Bajo Condiciones de Campo / Application of Microbial Antagonists for the Biological Control of Moniliophthora roreri Cif & Par in

open access: yesRevista Facultad Nacional de Agronomía Medellín, 2014
Resumen. En Colombia, las pérdidas ocasionadas porMoniliophthora roreri Cif & Par en el cultivo de cacao continúansiendo considerables. El objetivo del presente estudio fue investigarla actividad antagónica de dos aislamientos autóctonos ...
Jorge Enrique Villamil Carvajal   +2 more
doaj   +1 more source

Ring particle sizes and composition derived from eclipse cooling curves and reflection spectra [PDF]

open access: yes
The probable chemistry of the Saturn rings is reviewed. Reflectance spectra for H20 and NH3 frosts and Saturn's rings are compared, along with temperature dependence of 1.6 microns water frost feature.
Kieffer, H. H.
core   +1 more source

Vibrational spectroscopy of NO^+(H_2O)_n: Evidence for the intracluster reaction NO^+(H_2O)_n→H_3O^+(H_2O)_(n-2)(HONO) at n≥4 [PDF]

open access: yes, 1994
Infrared spectra of mass‐selected clusters NO^+(H_2O)_n for n=1 to 5 were recorded from 2700 to 3800 cm^(−1) by vibrational predissociation spectroscopy.
Cao, Yibin   +5 more
core  

Pseudoriemannian metrics on spaces of bilinear structures

open access: yes, 1991
The space of all non degenerate bilinear structures on a manifold $M$ carries a one parameter family of pseudo Riemannian metrics. We determine the geodesic equation, covariant derivative, curvature, and we solve the geodesic equation explicitly.
Gil-Medrano, Olga   +2 more
core   +4 more sources

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