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Aproximadamente 625 registro(s) hasta el momento: (journal)

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Recurso libre

International Association of Geomorphologists

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2005-04-01
Recurso:	SCIELO

Recurso libre

International Association of Geomorphologists

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2005-12-01
Recurso:	SCIELO

Recurso libre

Editorial

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2005-03-01
Recurso:	SCIELO

Recurso libre

Editorial

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2005-09-01
Recurso:	SCIELO

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Sources and historiography: conceptualizations of contraband trade in colonial Brazil
Pijning,Ernst

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2005-12-01
Recurso:	SCIELO

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Editorial
Sidorov,Grigori

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-06-01
Recurso:	SCIELO

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Editorial
Sierra,Gerardo

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-12-01
Recurso:	SCIELO

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Hematopoietic stem-cell transplantation using umbilical-cord blood cells
Rocha,Vanderson - Gamier,Federico - lonescu,Irina - Gluckman,Eliane

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2005-04-01
Recurso:	SCIELO

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General thoracic surgery as an independent specialty in Mexico
Orringer,Mark B - Castillo Ortega,Graciano - Olivares Torres,Carlos A - Morales Gómez,José

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2005-06-01
Recurso:	SCIELO

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10.

Symmetries and exchange relations
Cockshott,Paul

Formato:	journal article
Enlaces:	The paper presents an analysis of the value form based in ideas of metric spaces and symmetry preserving operations in these spaces. This is related to the concept of symmetry in systems governed by conservation laws.
Fecha:	2005-01-01
Recurso:	SCIELO

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11.

Preface
Aspiazu,Juan - Chávez,Efrain - Espinosa,Guillermo

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-02-01
Recurso:	SCIELO

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12.

Injury prevention and safety promotion
Krug,Etienne G

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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13.

The challenge of mental disability
Sotelo,Julio

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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14.

Intellectual disability: an unresolved world health challenge
Salvador-Carulla,Luis

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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15.

European Manifesto: basic standards of healthcare for people with intellectual disabilities
Scholte,Frans A

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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16.

How important is psychoneuroimmunology?
Leonard,Brian E.

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-04-01
Recurso:	SCIELO

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17.

Neglected priorities of mental health programmes
Sartorius,Norman

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-06-01
Recurso:	SCIELO

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18.

Editorial
Sucar Succar,L. Enrique - Coello Coello,Carlos A.

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-09-01
Recurso:	SCIELO

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19.

Special Issue on Multicriteria Decision Support Systems

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-12-01
Recurso:	SCIELO

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20.

Dr. Rafael Lamothe Argumedo. Academic Profile

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-08-01
Recurso:	SCIELO

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21.

Approaching Power and Understanding Leadership through The Lens of Joseph Nye
Valdés-Ugalde,José Luis

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-06-01
Recurso:	SCIELO

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22.

Weekly cycle in NCAR-NCEP reanalysis surface temperature data
TESOURO,M. - DE LA TORRE,L. - NIETO,R. - GIMENO,L. - RIBERA,P. - GALLEGO,D.

Formato:	journal article
Enlaces:	A weekly cycle has been detected in the surface temperature field of the NCAR-NCEP reanalysis for the North Atlantic area. This cycle consists of a minimum in the weekend for most of the studied area and a minimum in the…
Fecha:	2005-10-01
Recurso:	SCIELO

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23.

A new genus of wolf spiders from Mexico and Southern United States, with description of a new species from Texas (Araneae: Lycosidae)
Dondale,Charles D - Jiménez,Maria-Luisa - Nieto,Gisela

Formato:	journal article
Enlaces:	Pardosa parallela Banks, 1898 is made the type species of the new genus Camptocosa. Camptocosa parallela new combination is re-described from fresh material, and a new species C. texana, is described from Texas.
Fecha:	2005-06-01
Recurso:	SCIELO

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24.

A new species of Diplocentrus (Arachnida: Scorpiones) from Michoacan, Mexico
Francke B.,Oscar F. - Ponce Saavedra,Javier

Formato:	journal article
Enlaces:	Diplocentrus churumuco sp. nov., from the Balsas River Basin in Michoacan, Mexico is described and clearly differentiated from its nearest relatives. The tarsomere II spine formula is 4/4:4/4:5/5:5/5. Pectinal tooth counts are 9- 10 in males, and 7- 8 in…
Fecha:	2005-06-01
Recurso:	SCIELO

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25.

Short-term clearing of opaque otoliths from larval fish
Flores Coto,César - Sánchez Iturbe,Arturo

Formato:	journal article
Enlaces:	A simple technique for otolith of larval fishes is described. After fixing the otolith with some resin and drying, lift one edge of the resin and add 1-2 drops of xylene. The otolith becomes transparent and allows counting the growth…
Fecha:	2005-06-01
Recurso:	SCIELO

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26.

Cerebral ischemia: some secondary alterations and animal models
López-Hernández,María Estela - Solís,Hugo

Formato:	journal article
Enlaces:	Stroke is a leading cause of morbidity and mortality in industrialized countries. It imposes an enormous economic burden on the families of patients and on society. The purpose of this review is to give an overview about diverse animal models…
Fecha:	2005-07-01
Recurso:	SCIELO

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27.

North Atlantic Oscillation (NAO) and precipitation in Galicia (Spain)
GARCÍA,N. O. - GIMENO,L. - DE LA TORRE,L. - NIETO,R. - AÑEL,J. A.

Formato:	journal article
Enlaces:	In this study we investigate the time-scale at which NAO and ENSO are associated with the precipitation in Galicia (Northwestern of Spain), looking for possible climate predictors. The existence of preferred frequencies in all series was analyzed by using SS…
Fecha:	2005-01-01
Recurso:	SCIELO

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28.

Early meteorological records of Manila: El Niño episode of 1864
VAQUERO,J. M. - GALLEGO,M. C. - GARCÍA,J. A.

Formato:	journal article
Enlaces:	The goal of this contribution is to analyze the meteorological observations that the Spanish friar Antonio Llanos registered during the 1858-1865 period in the Philippines Isles. These records were published 140 years ago but have been ignored until now. The…
Fecha:	2005-07-01
Recurso:	SCIELO

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29.

Moving maids: dynamics of domestic service and development
Glantz,Namina M.

Formato:	journal article
Enlaces:	How might development influence and be influenced by domestic service? Part I poses potential connections between the two phenomena, followed by general trends in the domestic service industry. Characteristics of domestic servants and service are discussed in Part II. Part…
Fecha:	2005-01-01
Recurso:	SCIELO

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30.

Document Indexing with a Concept Hierarchy
Gelbukh,Alexander - Sidorov,Grigori - Guzmán-Arenas,Adolfo

Formato:	journal article
Enlaces:	Given a large hierarchical concept dictionary (thesaurus, or ontology), the task of selection of the concepts that describe the contents of a given document is considered. A statistical method of document indexing driven by such a dictionary is proposed. The…
Fecha:	2005-06-01
Recurso:	SCIELO

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31.

Quantifying Contrast Methods through Morphological Gradient
Mendiola-Santibañez,Jorge D - Terol-Villalobos,Iván R

Formato:	journal article
Enlaces:	In this work two quantifying contrast models are proposed. The first contrast measure method employs the concept denominated difference of contrast; while the second one takes in consideration the luminance gradient concept. These models allow the selection of the best…
Fecha:	2005-06-01
Recurso:	SCIELO

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32.

Computing Symbolic Expressions in Analog Circuits Using Nullors
Tlelo Cuautle,Esteban - Carlos,Sánchez López - Sandoval Ibarra,Federico

Formato:	journal article
Enlaces:	A novel method is introduced to compute symbolic expressions in analog circuits modeled by nullors. The proposed method is based on the formulation of a compact system of equations (CSEs) by manipulation of data-structures, which highly improves traditional symbolic-methods. It…
Fecha:	2005-12-01
Recurso:	SCIELO

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33.

Giant aortic aneurysm and rhabdomyomas in infant with tuberous sclerosis (Case report)
Patino Bahena,Emilia - Calderón-Colmenero,Juan - Buendia,Alfonso - Juanico,Antonio

Formato:	journal article
Enlaces:	We present the case of a giant aneurysm and dissection of the abdominal aorta in an eight month old infant. Imaging studies especially a helicoid computerized axial tomography with 3D reconstruction, showed a lesion which extended from the diaphragm to…
Fecha:	2005-12-01
Recurso:	SCIELO

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34.

Diverticulum of Kommerell
Calderón-Colmenero,Juan - Muñoz,Luis - García-Montes,José A - Ramírez,Samuel - Patino,Emilia - Buendía,Alfonso

Formato:	journal article
Enlaces:	A case of an 11-months-old girl with vomiting and laryngeal stridor is presented, and in whom a Kommerell diverticulum was demonstrated, which is a rare variant of the incomplete vascular ring. It is well known that the magnetic resonance is…
Fecha:	2005-12-01
Recurso:	SCIELO

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35.

Eyelid fish-hook injury: case report
Fuentes-Mallozzi,Dante Alejandro - Méndez-Orozco,Carlos Armando

Formato:	journal article
Enlaces:	Introduction. Injuries caused by fishing gear are common, but uncommon in the eye.When hooks are involved, removal must be careful and a complete revision of the rest of eye structures must be performed. Case report. A 13 years old male…
Fecha:	2005-12-01
Recurso:	SCIELO

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36.

A new combination in Peniocereus (Cactaceae)
Gómez-Hinostrosa,Carlos - Hernández,Héctor M.

Formato:	journal article
Enlaces:	Acanthocereus chiapensis Bravo was described from plants collected in Chiapas, Mexico in March 1967. Field observations as well as detailed morphological and anatomical studies revealed that this entity rather belongs to genus Peniocereus. This taxonomic opinion was supported by the…
Fecha:	2005-12-01
Recurso:	SCIELO

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37.

Enzymatic Hydrolysis of N-protected 2-Hydroxymethylpiperidine Acetates
Solís,Aida - Nava,Artemio - Pérez,Herminia Inés - Manjarrez,Norberto - Luna,Héctor - Cassani,Julia

Formato:	journal article
Enlaces:	Liver acetone powders (LAPs) were used as hydrolase sources to biocatalyze the hydrolysis of N-protected-2-hydroxymethylpiperidine acetates (N-Ts and N-Boc). Different reaction conditions were evaluated, like source of LAP (cat, guinea pig, chicken, dog, sheep, bovine, rat, mouse, pig and rabbit),…
Fecha:	2008-09-01
Recurso:	SCIELO

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38.

Cranking the semimicroscopic algebraic cluster model
Yépez-Martínez,H - Hess,P.O.

Formato:	journal article
Enlaces:	Initial steps are presented on the cranking of the Semimicroscopic Algebraic Cluster Model (SACM). This permits to treat Hamiltonians which do not present a dynamical symmetry.
Fecha:	2008-12-01
Recurso:	SCIELO

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39.

Sexual and reproductive health of young people
Shah,Iqbal H - Leal,Ondina Fachel - Bronfman,Mario

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-02-01
Recurso:	SCIELO

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40.

Traumatic brain injury in Latin America and the Caribbean: a call for research
Puvanachandra,Prasanthi - Hyder,Adnan A.

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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41.

The role of supervision of children in injury prevention
Mack,Karin A - Sogolow,Ellen - Strouse,Darcy - Lipman,Paula Darby

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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42.

Setting priorities for child health and research: the neglected burden of injuries
Ameratunga,Shanthi N - Hyder,Adnan A - Sultana,Shaheen

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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43.

Intellectual disability and its effects on society
Lazcano-Ponce,Eduardo - Rangel-Eudave,Guillermina - Katz,Gregorio

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-01-01
Recurso:	SCIELO

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44.

Reply to the comment by Stinnesbeck et al. on The oldest stratigraphic record of the Late Cretaceous shark Ptychodus mortoni Agassiz, from Vallecillo, Nuevo León, northeastern Mexico"
Blanco-Piñón,Alberto - Garibay-Romero,Luis M.

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-08-01
Recurso:	SCIELO

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45.

Vernacular Conversations on Immigration and Border-Crossing: A Narrative-Oriented Action Research Project
Montes,Adonay A. - Rodríguez-Valls,Fernando

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2008-06-01
Recurso:	SCIELO

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46.

Incidence and risk factors for cutaneous adverse drug reactions in an intensive care unit
Campos-Fernández,Maria del Mar - Ponce-de-León-Rosales,Samuel - Archer-Dubon,Carla - Orozco-Topete,Rocío

Formato:	journal article
Enlaces:	Objective. To evaluate the incidence of adverse cutaneous drug reactions in intensive care unit patients. Design. Cohort study. Setting. General adult intensive care unit of an institutional tertiary care hospital. Patients. Patients in the intensive care unit during a consecutive…
Fecha:	2005-12-01
Recurso:	SCIELO

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47.

Clinical follow up of Mexican women with early onset of breast cancer and mutations in the BRCA1 and BRCA2 genes
Calderón-Garcidueñas,Ana Laura - Ruiz-Flores,Pablo - Cerda-Flores,Ricardo M - Barrera-Saldaña,Hugo A

Formato:	journal article
Enlaces:	OBJECTIVE: This study describes the presence of mutations in BRCA1 and BRCA2 genes in a group of Mexican women and the clinical evolution of early onset breast cancer (EOBC). MATERIAL AND METHODS: A prospective hospital-based study was performed in a…
Fecha:	2005-04-01
Recurso:	SCIELO

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48.

Informing the TB suspect for sputum sample collection and communicating laboratory results in Nicaragua: a neglected process in tuberculosis case finding
Macq,Jean - Solis,Alejandro - Velázquez,Harry - Dujardin,Bruno

Formato:	journal article
Enlaces:	OBJETIVO: valorar el proceso de información del paciente antes de la producción de esputo, la calidad de la muestra de esputo, y la transmisión de los resultados del examen microscópico del esputo a los sospechosos de tuberculosis (TB) en tres…
Fecha:	2005-07-01
Recurso:	SCIELO

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49.

Dietary acculturation of Hispanic immigrants in Mississippi
Gray,Virginia B. - Cossman,Jeralynn S. - Dodson,Wanda L. - Byrd,Sylvia H.

Formato:	journal article
Enlaces:	OBJECTIVE: Assisting Hispanic immigrants in making culturally acceptable food choices may affect their health for generations. As a relatively new enclave of Hispanics, Scott County, Mississippi, was chosen to study dietary acculturation and health concerns of immigrants. MATERIAL AND METHODS:…
Fecha:	2005-10-01
Recurso:	SCIELO

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50.

Hepatitis A: the burden among Latino children in California
Hayes-Bautista,David E. - Hsu,Paul - Pérez,Aidé - Sosa,Lucette - Gamboa,Cristina

Formato:	journal article
Enlaces:	OBJECTIVE: To determine the prevalence of Hepatitis A within subpopulations of southern California counties. MATERIAL AND METHODS: Age and race/ethnic-specific hepatitis A rates were derived from the California Department of Health Services Surveillance and Statistics Section for 1996-2001 and from…
Fecha:	2005-12-01
Recurso:	SCIELO

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51.

Favorable effects of pyridoxine and folic acid supplementation of shr-sp
Perez,SC - Vianna,LM

Formato:	journal article
Enlaces:	Homocysteine has been associated to the stroke, which enhances the interest for the investigation about the role of vitamins involved on its metabolism. Stroke Prone rats were treated by pyridoxine and folic acid at doses correspondent to five, ten and…
Fecha:	2005-07-01
Recurso:	SCIELO

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52.

Impact of the Popocatepetl's volcanic activity on the air quality of Puebla City, México
JUÁREZ,A. - GAY,C. - FLORES,Y.

Formato:	journal article
Enlaces:	In this work we report measurements of atmospheric pollutants in Puebla City, including those registered during the period characterized by intense volcanic activity from Popocatépetl volcano between December 2000 and January 2001. We used a gaussian air dispersion model to…
Fecha:	2005-01-01
Recurso:	SCIELO

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53.

Study of thunderstorm and rainfall activity over the Indian region
KANDALGAONKAR,S. S. - TINMAKER,M. I. R. - NATH,A. - KULKARNI,M. K. - TRIMBAKE,H. K.

Formato:	journal article
Enlaces:	Thirty years (1951-1980) of mean monthly thunderstorms days (TS) and rainfall (RF) amounts for 260 Indian observatories spread uniformly over the country were used to obtain their monthly, seasonal and zonal percentage of occurrence from all India totals. The study…
Fecha:	2005-04-01
Recurso:	SCIELO

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54.

Gridsize induced error in the discretization of exchange processes at the tropopause
FIEBIG-WITTMAACK,M.

Formato:	journal article
Enlaces:	We study the accuracy of the finite differences discretization scheme for a 2-D simplified model of global tracer transport, in the case that the diffusion coefficients relating flux to the gradient of the mixing ratio have discontinuity jumps at the…
Fecha:	2005-07-01
Recurso:	SCIELO

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55.

Urban effects on precipitation in Ankara
ÇIÇEK,I. - TURKOGLU,N.

Formato:	journal article
Enlaces:	In this study, trends of the precipitation day classes in the warm period (May-September) were investigated for Ankara. Data collected by Ankara Meteorology Station (AMS) which has urban characters, and Esenboga Meteorology Station (EMS) which has rural characters, were statistically…
Fecha:	2005-07-01
Recurso:	SCIELO

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56.

Atmospheric and thermal anomalies observed around the time of strong earthquakes in México
DUNAJECKA,M. A. - PULINETS,S. A.

Formato:	journal article
Enlaces:	Recently developed theory of Lithosphere-Atmosphere-Ionosphere (LAI) coupling pays attention to the processes taking place within the near ground layer of atmosphere. Air ionization produced by radon emanating from the earth's crust launches the chain of physico-chemical processes which change significantly…
Fecha:	2005-10-01
Recurso:	SCIELO

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57.

Analysis of the short term geo-environmental evolution of an endorreic basin using satellite images: the case of Tecocomulco Lagoon, Mexico
Lanza Espino,Guadalupe de la - Gómez Rodríguez,Gabriela

Formato:	journal article
Enlaces:	The Great Basin of the Valley of Mexico was composed of several lagoons that have disappeared due to their geologic evolution and anthropogenic activities. The Tecocomulco lagoon, Hidalgo, is a relict of that basin and has undergone extreme changes in…
Fecha:	2005-12-01
Recurso:	SCIELO

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58.

CRIB: A Method for Integrity Constraint Checking on Knowledge Bases
Clemente,Julia - de Antonio,Angélica - Ramírez,Jaime

Formato:	journal article
Enlaces:	The necessity of verification tools for Knowledge Based-Systems (KBSs), that help to guarantee a certain degree of quality and reliability of these systems will increase in the future when more critical systems are developed in areas such as industry, science,…
Fecha:	2005-06-01
Recurso:	SCIELO

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59.

Transversal Filter MMIC design for Multi-Gbit/s Optical CDMA Systems
Aguilar Torrentera,Jorge - Darwazeh,Izzat

Formato:	journal article
Enlaces:	In this work, the approach of the distributed transversal filter for Optical COMA systems is addressed. It demonstrates that pulse generation and correlation functions can be accomplished in the electrical domain for multi-Gbit/s systems. The practicalities of the approach were…
Fecha:	2005-06-01
Recurso:	SCIELO

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60.

The Practical Design Method: A Software Design Method for a First Object-Oriented Project
Ortega Arjona,Jorge L

Formato:	journal article
Enlaces:	Commercial object-oriented design methods are often complicated and hard to learn and use. This paper presents a software design method that is a pragmatic and simple approach to designing object-oriented applications. It is based on the fundamental principles of object-oriented…
Fecha:	2005-09-01
Recurso:	SCIELO

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61.

Training and Development Module for a Digital Signal Processing Laboratory
García López,Juan - Ortega Coral,César - Palafox Maestre,Luis E - Esqueda Elizondo,José J

Formato:	journal article
Enlaces:	A digital signal processing training module (DSPTM) is constructed around a TMS320C6211 starter kit. The DSP target system is enclosed in a portable case with the necessary accessories: A host port interface connector, power supply, function generator, audio amplifier, speaker,…
Fecha:	2005-09-01
Recurso:	SCIELO

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62.

Segmentation of Blood Vessels Based on a Threshold that Combines Statistical and Scale Space Filters
Rodríguez,Roberto

Formato:	journal article
Enlaces:	This paper presents a strategy for segmenting blood vessels based on the threshold, which-combines statistic and scale space filter. By incorporating statistical information, the strategy is capable of reducing over-segmentation. We propose a three stage strategy which involves: (1) optimal…
Fecha:	2005-12-01
Recurso:	SCIELO

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63.

Optimal and Robust Sliding Mode Regulator for Linear Systems with Delayed Control
Michael,Basin - Rodríguez Gonzalez,Jesus - Acosta,Pedro - Fridman,Leonid

Formato:	journal article
Enlaces:	This paper presents the optimal regulator for a linear system with time delay in control input and a quadratic criterion. The optimal regulator equations are obtained using the duality principle, which is applied to the optimal filter for linear systems…
Fecha:	2005-12-01
Recurso:	SCIELO

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64.

Fluoride concentration in toothpastes of the Mexican market
Hernández-Guerrero,Juan Carlos - de la Fuente H.,Javier - Ledesma-Montes,Constantino - Fontana-Uribe,Bernardo - Jiménez-Farfán¹,Dolores

Formato:	journal article
Enlaces:	Introduction. The most widely used method for applying fluoride (F-) topically is the fluoridated toothpaste. Its early use in large quantities is a risk factor for dental fluorosis. Objective: to determine the actual concentration of F in toothpastes sold in…
Fecha:	2005-02-01
Recurso:	SCIELO

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65.

Ethical aspects of the extreme premature newborn
Hernández- Arriaga,Jorge L. - Iserson,Kenneth V

Formato:	journal article
Enlaces:	As neonatology continues to advance medical knowledge and situations surrounding the care of ill and premature newborns, each step introduces ill- defined methodologies, unknown outcomes, and increasing costs. In countries such as Mexico, the government hospitals assume the cost of…
Fecha:	2005-08-01
Recurso:	SCIELO

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66.

Historical biogeography in the age of complexity: expansion and integration
Brooks,Daniel R.

Formato:	journal article
Enlaces:	Historical biogeography has recently experienced a significant advancement in three integrated areas. The first is the adoption of an ontology of complexity, replacing the traditional ontology of simplicity, or a priori parsimony; simple and elegant models of the biosphere are…
Fecha:	2005-06-01
Recurso:	SCIELO

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67.

Phylogeny and revision of Erpobdelliformes (Annelida, Arhynchobdellida) from Mexico based on nuclear and mithochondrial gene sequences.
Oceguera-Figueroa,Alejandro - León-Règagnon,Virginia - Siddall,Mark E.

Formato:	journal article
Enlaces:	The phylogenetic relationships of the suborder Erpobdelliformes, a group of non-sanguivorous leeches, were investigated with the use of mitochondrial cytochrome c oxidase subunit I, mitochondrial 12S rDNA and nuclear 18S rDNA. The resulting hypothesis indicates that Erpobdellidae and Salifidae are…
Fecha:	2005-12-01
Recurso:	SCIELO

Recurso libre

68.

Cuauhtémoc regained
Fulton,Christopher

Formato:	journal article
Enlaces:	This essay continues the investigation of an earlier article, also published in this journal, by examining artistic representations of Cuauhtémoc in the post-revolutionary period, and especially after 1940, when the figure of the last Aztec king became widely and variously…
Fecha:	2008-12-01
Recurso:	SCIELO

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69.

Diverse Time-Frequency Distributions Integrated to an ART2 Network for Non-Destructive Testing
Benítez-Pérez,H. - Medina-Gómez,L.

Formato:	journal article
Enlaces:	The use of several techniques for non-destructive testing is a common strategy for detecting and classifying flaws in aluminium material. Techniques like multiresolution data analysis and data classifiers are valuable for obtaining as much information as possible from the flaws.…
Fecha:	2008-04-01
Recurso:	SCIELO

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70.

Measurement of Chua Chaos and Its Applications
Núñez Pérez,Ricardo

Formato:	journal article
Enlaces:	The present paper shows a single and original measurement circuit, using instantaneous and average readouts of the chaotic dynamic of a Chua's circuit Vc1(X1) signal with binary decryption, synchrony qualification and chaotic sequence applications. The circuit was simulated (Workbench), developed…
Fecha:	2008-04-01
Recurso:	SCIELO

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71.

Ring CMOS NOT-based Oscillators: Analysis and Design
Sandoval-Ibarra,F. - Hernández-Bernal,E. S.

Formato:	journal article
Enlaces:	This paper presents design hints in CMOS ring oscillators based on NOT gates. The NOT gate is used as vehicle to introduce basics on signal propagation and also to present simple design models. Both simulation and experimental results are presented…
Fecha:	2008-04-01
Recurso:	SCIELO

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72.

Wireless Communication Protocol Based on EDF for Wireless Body Sensor Networks
Aquino-Santos,Raúl - González Potes,Apolinar - Rangel-Licea,Víctor - García-Ruiz,Miguel A. - Villaseñor-González,L. A. - Edwards-Block,Arthur

Formato:	journal article
Enlaces:	This paper presents a wireless communication protocol based on the Earliest Deadline First policy for wireless body sensor networks. This work advances a previous effort by proposing using an implicit Earliest Deadline First policy to guarantee real-time communication by optimizing…
Fecha:	2008-08-01
Recurso:	SCIELO

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73.

Perspectives on the Density Functional Theory of Chemical Reactivity
Gázquez,José L.

Formato:	journal article
Enlaces:	A brief perspective of the development of the density functional theory of chemical reactivity since the identification of the chemical potential with the electronegativity in 1978 is presented. The reactivity concepts are examined together with the chemical principles associated with…
Fecha:	2008-03-01
Recurso:	SCIELO

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74.

Revisiting the Effects of the Molecular Structure in the Kinetics of Electron transfer of Quinones: Kinetic Differences in Structural Isomers
Frontana,Carlos - González,Ignacio

Formato:	journal article
Enlaces:	The effect of 2,5 and 2,6 disubstitution (R = CH3, Cl, C(CH3)3) for 1,4-benzoquinones, in the reorganization energy (λ) for the first electron uptake process was analyzed in acetonitrile solution. Data obtained by cyclic voltammetry suggested differences in λ for…
Fecha:	2008-03-01
Recurso:	SCIELO

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75.

Shannon Entropies of Atomic Basins and Electron Correlation Effects
Sagar,Robin P. - Hô,Minhhuy

Formato:	journal article
Enlaces:	Electron correlation effects on atomic basin populations of AIM theory and the resulting de/localization of the basin charge and momentum densities, as measured by local Shannon entropies and basin kinetic energies, are discussed for a series of ten- , fourteen-…
Fecha:	2008-03-01
Recurso:	SCIELO

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76.

Bi and Three-Metallic Electrocatalysts Preparation for Methanol Oxidation
Márquez-Navarro,Yara - Galicia,Laura - Lara,Víctor Hugo - Ángel,Gloria Del

Formato:	journal article
Enlaces:	Bi and tri-metallic (Pt-Ru/C, Pt-Mo/C and Pt-Ru-Mo/C) catalysts were synthesized by using as precursors the metallic salts and applying the co-impregnation method. The tri-metallic catalysts underwent different thermal treatments and they were characterized by X-Ray. The catalytic activity for methanol…
Fecha:	2008-03-01
Recurso:	SCIELO

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77.

Folded Conformations of Maitotoxin
Matus,Myrna H. - Escobar,Laura - Galván,Marcelo

Formato:	journal article
Enlaces:	We used classical molecular mechanics and dynamics simulations to sample the conformational space of maitotoxin, the largest and most lethal natural product. Among the set of minima obtained, the five conformers with the lowest energies show folded structures with an…
Fecha:	2008-03-01
Recurso:	SCIELO

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78.

Molecular Dynamics Simulations of the Solubility of H2S and CO2 in Water
López-Rendón,Roberto - Alejandre,José

Formato:	journal article
Enlaces:	We have performed molecular dynamics simulations at constant temperature and pressure to calculate the solubility of carbon dioxide (CO2) and hydrogen sulfide (H2S) in water. The solubility of gases in water is important in several technological problems, in particular in…
Fecha:	2008-03-01
Recurso:	SCIELO

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79.

Ethane Internal Rotation -Vibrational Hamiltonian
Hidalgo-Olguín,David Ricardo - Villa,María - Senent,María Luisa - Mora-Delgado,Marco Antonio

Formato:	journal article
Enlaces:	One of the main purposes of a theoretical spectroscopist is to propose a model to reproduce the xperimental spectra available in the literature as accurate and with as much physical information as possible. In this case it has been studied…
Fecha:	2008-03-01
Recurso:	SCIELO

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80.

Synthesis and Characterization of a New Oxidation Reagent: Tetrahexylammonium Chlorochromate, (C6H13)4N[CrO3Cl]
Koohestani,Behnam - Javanshir,Zahra - Ghammamy,Shahriare - Mehrani,Kheyrollah - Afrand,Hamid - Saghatforoush,Lotfali

Formato:	journal article
Enlaces:	Tetrahexylammonium chlorochromate, THACC, is a new compound, more efficient, and has certain advantages over similar oxidizing agents, in terms of the amount of oxidant, short reaction times, and high yields. This reagent is suitable for oxidizing various primary and secondary…
Fecha:	2008-06-01
Recurso:	SCIELO

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81.

Synthesis and Characterization of Natural Abundance and Isotopically Labeled 1,4-Bis(3,3,3-triphenylpropynyl)-2,3-difluorobenzene: A Molecular Gyroscope with a Polar Rotator
Santillán,Rosa - Karlen,Steven D. - Dang,Hung - Garcia-Garibay,Miguel A.

Formato:	journal article
Enlaces:	Sonogashira coupling of natural abundance and d2-deuterated 1,4-bis(trifluoromethanesulfonate)-2,3-difluorobenzene provides access to 1,4-bis(3,3,3-triphenylpropynyl)-2,3-difluorobenzene, a structure that emulates a molecular gyroscope with a dipolar rotator. Two crystal forms of this compound are of interest for the construction of ferroelectric materials.
Fecha:	2008-06-01
Recurso:	SCIELO

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82.

Titanium-modified MCM-41 Prepared by Ultrasound and by Hydrothermal Treatment, Catalysts for Acetylation Reactions
Angeles-Beltrán,Deyanira - Negrón-Silva,Guillermo - Lomas-Romero,Leticia - Iglesias-Arteaga,Martín A. - Cadete Santos-Aires,Francisco J.

Formato:	journal article
Enlaces:	Mesoporous materials type Ti-MCM-41 prepared by hydrothermal and ultrasound-assisted techniques were characterized by XRD, SEM, TEM, nitrogen physisorption, ammonia TPD, UV-vis and FT-IR. Both showed the MCM-41 characteristic structure. Hydrothermal treatment allowed obtaining a well ordered material and ultrasound procedure…
Fecha:	2008-09-01
Recurso:	SCIELO

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83.

Applicability of the National Cholesterol Education Program III (NCEP-III) Guidelines for treatment of dyslipidemia in a non-Caucasian population: A Mexican Nation-Wide Survey
Rojas,Rosalba - Aguilar-Salinas,Carlos A. - Gómez-Pérez,Francisco J. - Valles,Victoria - Franco,Aurora - Olaiz,Gustavo - Sepúlveda,Jaime - Rull,Juan A.

Formato:	journal article
Enlaces:	We assessed the impact of the NCEP-III recommendations in a population-based, nation-wide Mexican survey. Information was obtained from 15,607 subjects aged 20 to 69 years. In this report, only samples obtained after a 9 to 12 hours fast are included…
Fecha:	2005-02-01
Recurso:	SCIELO

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84.

Sentinel lymph node biopsy in colorectal cancer: A pilot study
Medina-Franco,Heriberto - Takahashi,Takeshi - González-Ruiz,Gabriel F. - De-Anda,Jazmin - Velazco,Liliana

Formato:	journal article
Enlaces:	Background. Although sentinel lymph node biopsy technique is the gold standard in the management of malignant melanoma and is gradually replacing conventional axillary dissection in breast cancer, its use in colorectal cancer is still controversial. The objective of this study…
Fecha:	2005-02-01
Recurso:	SCIELO

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85.

Treatment of acute promyelocytic leukemia: A single institution experience
Ruiz-Argüelles,Guillermo J - Morales-Toquero,Amelia - Gómez-Rangel,José David - López-Martínez,Briceida - Ruiz-Delgado,Guillermo J - Reyes-Núñez,Virginia

Formato:	journal article
Enlaces:	The results of the treatment of 14 patients with promyelocytic leukemia (PML) treated with all trans-retinoic acid (ATRA), combined chemotherapy (CT) and prophylactic prednisone are reported; the median age was 30 years (range 7 - 49). A complete remission (CR)…
Fecha:	2005-06-01
Recurso:	SCIELO

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86.

CD4 and CD8 T cell response to the rHSP60 from Klebsiella pneumoniae in peripheral blood mononuclear cells from patients with ankylosing spondylitis
Zambrano-Zaragoza,Francisco - García-Latorre,Ethel - Domínguez-López,María Lilia - Cancino-Díaz,Mario Eugenio - Burgos-Vargas,Rubén - Jiménez-Zamudio,Luis

Formato:	journal article
Enlaces:	Objective. To determine the processing pathways used by peripheral blood mononuclear cells (PBMC) and present the rHSP60Kp, and the T cell subpopulations involved in the response, in patients with ankylosing spondylitis (AS) Methods. The lymphoproliferative response to the rHSP60Kp in…
Fecha:	2005-08-01
Recurso:	SCIELO

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87.

Endoscopic retrograde cholangiopancreatography in the elderly
Ávila-Fuñes,José Alberto - Montaño-Loza,Aldo - Zepeda-Gómez,Sergio - Meza-Junco,Judith - Melano-Carranza,Efrén - Valdovinos-Andraca,Francisco - Valdovinos-Díaz,Miguel A. - Ponce de León-Rosales,Sergio

Formato:	journal article
Enlaces:	Background. Endoscopic retrograde cholangiopancreatography (ERCP) is a widely used technique for the diagnosis and treatment of biliary and pancreatic diseases. Objective. To know the complication rate of ERCP in the elderly. Patients and methods. Patient files who underwent ERCP were…
Fecha:	2005-10-01
Recurso:	SCIELO

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88.

Classical fever of unknown origin (FUO): current causes in Mexico
Arce-Salinas,César Alejandro - Morales-Velá,José Luis - Villaseñor-Ovies,Pablo - Muro-Cruz,Daniel

Formato:	journal article
Enlaces:	Background. Causes of FUO change according to medical innovations, modifications of social circumstances, and emerging health risks. Aim. To describe the epidemiology of classical FUO, the time and procedures to achieve a definitive diagnosis, and to underline the variables useful…
Fecha:	2005-12-01
Recurso:	SCIELO

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89.

Obesity and overweight in IMSS female workers in Mexico City
Vázquez-Martínez,José Luis - Gómez-Dantés,Héctor - Gómez-García,Felipe - Lara-Rodríguez,María de los Angeles - Navarrete-Espinosa,Joel - Pérez-Pérez,Gabriela

Formato:	journal article
Enlaces:	OBJECTIVE: To estimate the prevalence and risk factors for overweight (OW) and obesity (OB) in women working at the Mexican Social Security Institute (IMSS, per its abbreviation in Spanish) in Mexico City, using two different classification criteria. MATERIAL AND METHODS:…
Fecha:	2005-07-01
Recurso:	SCIELO

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90.

Accessory middle cerebral artery associated with two intracranial aneurysms
Garza-Mercado,Román - Tamez-Montes,Dagoberto - Martfnez-Ponce de León,Angel - Morales-García,Victor Daniel

Formato:	journal article
Enlaces:	Objective and importance: albeit very likely underdisclosed, duplication of the middle cerebral artery (MCA) is a rather unfrequently recognized angiographic finding. In this instance the anomaly was associated with two intracranial aneurysms, one ruptured. Clinical presentation: an anomalous, twinlike MCA,…
Fecha:	2005-03-01
Recurso:	SCIELO

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91.

Surface energy balance measurements in the México City region: a review
TEJEDA MARTÍNEZ,A. - JÁUREGUI OSTOS,E.

Formato:	journal article
Enlaces:	During the last decade of the 20th Century, diverse campaigns for measuring the atmospheric energy balance were performed in downtown México City (School of Mines and Preparatory School No. 7), in the southern suburbs (University Reserve) and in the surrounding…
Fecha:	2005-01-01
Recurso:	SCIELO

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92.

Standardized Precipitation Index Zones for México
GIDDINGS,L. - SOTO,M. - RUTHERFORD,B. M. - MAAROUF,A.

Formato:	journal article
Enlaces:	Precipitation zone systems exist for México based on seasonality, quantity of precipitation, climates and geographical divisions, but none are convenient for the study of the relation of precipitation with phenomena such as El Niño. An empirical set of seven exclusively…
Fecha:	2005-01-01
Recurso:	SCIELO

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93.

On the annual cycle of the sea surface temperature and the mixed layer depth in the Gulf of México.
MENDOZA,V. M. - VILLANUEVA,E. E. - ADEM,J.

Formato:	journal article
Enlaces:	Using an integrated mixed layer model we carry out a simulation of the annual cycle of the sea surface temperature (SST) and of the mixed layer depth (MLD) in the Gulf of México. We also compute the annual cycle of…
Fecha:	2005-04-01
Recurso:	SCIELO

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94.

Partitioning of formaldehyde between gas phase and particles (PM2.5) in México City
ANDRACA-AYALA,G. - RUIZ-SUÁREZ,L. G.

Formato:	journal article
Enlaces:	An annular denuder/filter-pack sampling technique has been employed to get an insight of the formaldehyde partitioning between gas phase and particles (PM2.5) in México City using short time sampling periods. Formaldehyde was trapped using DNPH derivatives and analyzed by HPLC/UV.…
Fecha:	2005-07-01
Recurso:	SCIELO

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95.

Possible impact of urbanization on the thermal climate of some large cities in México
JÁUREGUI,E.

Formato:	journal article
Enlaces:	Urbanization has been the dominant demographic trend during the second half of the 20th century in México. In 2000 there were 69 cities with more than 100,000 inhabitants of which 9 of them exceeded one million population, totalizing 53.4 million.…
Fecha:	2005-10-01
Recurso:	SCIELO

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96.

Risk factors for prolonged mechanical ventilation after surgical repair of congenital heart disease
García-Montes,José A. - Calderón-Colmenero,Juan - Casanova,Miguel - Zarco,Ernesto - Fernández de la Reguera,Guillermo - Buendía,Alfonso

Formato:	journal article
Enlaces:	Objective: The purpose of this study was to determine factors contributing to prolonged mechanical ventilation in children following surgery for congenital heart defects. Design: Prospective cohort trial. Setting: Critical Care Unit. "Ignacio Chavez" National Heart Institute, México; from January to…
Fecha:	2005-12-01
Recurso:	SCIELO

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97.

The ellipticity of Rayleigh waves at infinite depth
Malischewsky Auning,P

Formato:	journal article
Enlaces:	I present an analytical formula and an approximation for the ellipticity of Rayleigh waves in a homogeneous half-space at infinite depth in terms of Poisson's ratio. The result is compared with the corresponding formulas for surface ellipticity.
Fecha:	2008-03-01
Recurso:	SCIELO

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98.

Historical sunspot records from Mexico
Vaquero,J. M. - Moreno-Corral,M. A.

Formato:	journal article
Enlaces:	The historical reconstruction of solar activity is a task of great interest for geophysicists and solar physicists. Historical sunspot observations are a fundamental tool for this task. In this short contribution, we present some historical sunspot observations in Mexico.
Fecha:	2008-09-01
Recurso:	SCIELO

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99.

SU(1,1) coherent states as Bessel-Gauss states
Hacyan,S

Formato:	journal article
Enlaces:	The SU(1,1) coherent states of Barut and Girardello can be interpreted as Bessel-Gauss states that are time-dependent solutions of the Schrödinger equation. In this article, some basic properties of these states and their related operators are analyzed.
Fecha:	2008-12-01
Recurso:	SCIELO

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100.

Neutrino masses and neutrinoless double-beta decay
Pavan,Maura

Formato:	journal article
Enlaces:	The potentialities of Double Beta Decay experiments in the field of neutrino study are here discussed. Sensitivity and results are compared with the information coming from oscillation, cosmology and beta decay measurements.
Fecha:	2008-12-01
Recurso:	SCIELO