scholarly journals CARACTERIZACIÓN MORFOLÓGICA in situ DE CHILES (Capsicum spp.) SILVESTRES Y CULTIVADOS EN LA REGIÓN USUMACINTA, TABASCO

Kuxulkab ◽  
2021 ◽  
Vol 27 (58) ◽  
pp. 49-57
Author(s):  
Alex Ricardo Ramirez Garcia
Keyword(s):  
Capsicum Spp

El objetivo del trabajo fue determinar la diversidad morfológica de los chiles ('Capsicum' spp.) silvestres y cultivados en la Región Usumacinta del estado de Tabasco. En los recorridos se obtuvieron 48 colectas de chiles distribuidas en 13 morfotipos, encontradas en 12 localidades de seis municipios de la región. A cada uno se le realizó la caracterización morfológica in situ utilizando 26 variables de planta, flor y fruto con base en la guía de descriptores para Capsicum del IPGRI. Los datos se analizaron por medio de un Análisis de Componentes Principales. En los dos primeros componentes principales se reportó el 42.55 % de la variación total entre colectas. Esto explica en mayor proporción la variabilidad de fruto y planta. Por lo tanto, se puede afirmar que existe variabilidad morfológica en colectas de chiles cultivados y silvestres. Se encontró en mayor frecuencia el morfotipo cultivado tabaquero y silvestres el pico de paloma.

scholarly journals COLLECTION AND in situ MORPHOLOGICAL CHARACTERIZATION OF PEPPERS (Capsicum spp.) CULTIVATED IN TABASCO, MEXICO

2014 ◽  
Vol XX (3) ◽  
pp. 269-282
Author(s):  
Carlos A. Narez-Jiménez ◽  
◽  
Efraín de la Cruz-Lázaro ◽  
Armando Gómez-Vázquez ◽  
César Márquez-Quiroz ◽  
...  
Keyword(s):  
Morphological Characterization ◽  
Capsicum Spp

scholarly journals LA DIVERSIDAD MORFOLÓGICA in situ DE CHILES SILVESTRES (Capsicum spp.) DE TABASCO, MÉXICO

2014 ◽  
Vol 37 (3) ◽  
pp. 209 ◽  
Author(s):  
Carlos A. Narez-Jiménez ◽  
Efraín De-la-Cruz-Lázaro ◽  
Armando Gómez-Vázquez ◽  
Guillermo Castañón-Nájera ◽  
Aldenamar Cruz-Hernández ◽  
...  
Keyword(s):  
Capsicum Spp ◽  
Los Grupos

En el estado de Tabasco, México se pueden encontrar plantas de chile (Capsicum spp.) de forma silvestre que se diferencian por sus características morfológicas. Con el objetivo de recolectar y evaluar in situ la diversidad morfológica de chiles silvestres, de enero a septiembre de 2013 se realizó la exploración de 48 comunidades en 14 municipios del estado de Tabasco. Durante la exploración se recolectaron y tomaron datos de variables de planta, flor y fruto de 89 colectas. Se encontró la presencia de las especies C. annuum var. glabriusculum en los morfotipos ‘Amashito’, ‘Ojo de cangrejo’ y ‘Garbanzo’; y C. frutescens L. en el morfotipo ‘Pico paloma’. El análisis de componentes principales y de conglomerados con las 12 variables relevantes, diferenciaron a las colectas en dos grupos, los cuales se formaron con base en variables de fruto y de hoja. El primer grupo se formó con las 43 colectas de C. annuum var. glabriusculum que se caracterizan por tener frutos de forma redonda, corola pequeña de color blanco y una flor por nudo; el segundo grupo se formó con 46 colectas de C. frutescens L. que se caracterizan por tener frutos alargados, corola de color blanca verdosa y de dos a tres flores por nudo. Al interior de los grupos también se presentó una diferencia gradual y continua de las variables, lo que permitió formar subgrupos. En los chiles silvestres del Estado de Tabasco se encuentra diversidad morfológica, recurso genético valioso que debe conservarse.

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Structural Studies on Mitotic Spindle Fibres

1978 ◽  
Vol 36 (3) ◽  
pp. 615-626
Author(s):  
J.R. Mcintosh
Keyword(s):  
Chemical Composition ◽  
Mitotic Spindle ◽  
Structural Studies ◽  
Mitotic Apparatus ◽  
Chemical Studies ◽  
Medical Interest ◽  
Spindle Fibres

The mitotic apparatus is a structure of obvious biological and medical interest, but it has proved to be a difficult cellular machine to understand. The chemical composition of the spindle is only slightly elucidated, largely because of the difficulties in preparing useful isolates of the structure. Chemical studies of the mitotic spindle have been reviewed elsewhere (Mcintosh, 1977), and will not be discussed further here. One would think that structural studies on the mitotic apparatus (MA) in situ would be straightforward, but even with this approach there is some disagreement in the results obtained with various methods and by different investigators. In this paper I will review briefly the approaches which have been used in structural studies of the MA, pointing out the strengths and problems of each approach. I will summarize the principal findings of the different methods, and identify what seem to be fruitful avenues for further work.

Sign in / Sign up

Export Citation Format

Share Document