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| Registros recuperados: 154 | |
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| Ramírez-Arriaga,Elia; Martínez-Hernández,Enrique; Prámparo,Mercedes B.. |
| This publication presents the systematics of monolete and trilete spores, and polyplicate, inaperturate and bisaccate pollen grains recovered from outcrops of the Cuayuca Formation, State of Puebla, southern Mexico. Species belonging to the following genera are described and illustrated: Cicatricosisporites, Deltoidospora, Foveotriletes, Leptolepidites, Lusatisporis, Retitriletes, Stereigranisporis, Verrucingulatisporites, Polypodiisporites, Pinuspollenites, Pityosporites, Ephedripites , and Cupressacites . Pteridophytes and bryophytes spores constitute 13.5% of the assemblages and gymnosperms 7.3%. Angiosperms, to be discussed on later papers, dominate the assemblage. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Palynology; Systematic descriptions; Tertiary; Cuayuca Formation; Paleogene; Mexico. |
| Ano: 2005 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000300005 |
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| Cifuentes-Ruiz,Paulina; Vega,Francisco J.; Cevallos-Ferriz,Sergio R.S.; González-Soriano,Enrique; Zaragoza-Caballero,Santiago; Garibayromero,Luis. |
| A scorpion prosoma, a plecopteran nymph, Euperlida parvicercifera Cifuentes-Ruiz gen. et sp. nov., and the elytra of an adult beetle (Coleoptera) are described from the Oligocene Coatzingo Formation, Puebla, Mexico. Specimens were found at the Los Ahuehuetes locality, Puebla, from where numerous plant remains have been previously described. A lacustrine paleoenvironment for these sediments is confirmed based on habitat of recent Plecoptera. This report represents the first record of Oligocene continental arthropods from Central Mexico, and the first for a fossil Plecoptera in this country. It is the first record for a Nearctic extinct genus of Perlidae. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Scorpionida; Insecta; Oligocene; Puebla; Mexico. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000400003 |
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| Castañeda Vázquez,H.; Jäger,S.; Wolter,W.; Zschöck,M.; Castañeda Vazquez,M.A.; El-Sayed,A.. |
| The present work is a large epidemiological study aiming to detect the prevalence of subclinical mastitis and to investigate the major udder pathogens in Jalisco State, western Mexico. For this purpose, 2205 dairy cows, representing 33 Mexican dairy herds, were involved. Of 2205 cows, 752 mastitic animals were diagnosed and only 2,979 milk samples could be obtained for further investigation. All 2979 milk samples were subjected to California Mastitis Test (CMT) to differentiate clinical cases from subclinical ones where 1996 samples (67 %) reacted positively. Of these, 1087 samples (54.5%) came from cows suffering from clinical cases of mastitis. Bacteriological identification of the causative agents revealed the presence of a major group of pathogens... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bovine mastitis; Corynebact spp.; Mexico; S.aureus; S.agalactiae. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000200012 |
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| Diupotex-Chong,María Esther; Cazzaniga,Néstor J.; Hernández-Santoyo,Alejandra; Betancourt-Rule,José Miguel. |
| Mitotic chromosomes of the freshwater snail Pomacea patula catemacensis (Baker 1922) were analyzed on gill tissue of specimens from the type locality (Lake Catemaco, Mexico). The diploid number of chromosomes is 2n = 26, including nine metacentric and four submetacentric pairs; therefore, the fundamental number is FN = 52. No sex chromosomes could be identified. The same chromosome number and morphology were already reported for P. flagellata, i.e., the other species of the genus living in Mexico. The basic haploid number for family Ampullariidae was reported to be n = 14 in the literature; so, its reduction to n = 13 is probably an apomorphy of the Mexican Pomacea snails. Lanistes bolteni, from Egypt, also shows n = 13, but its karyotype is much more... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apple snails; Chromosomes; Taxonomy; Phylogeny; Mexico. |
| Ano: 2004 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452004000300004 |
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| Hernández-Canchola,Giovani; Gómez-Jiménez,Yire A.; Hernández-Chávez,Iván; Lucero-Verdugo,Sara Carolina; León-Paniagua,Livia. |
| Abstract: The frugivorous bats of the genus Vampyressa include five neotropical species, and some of them are considered relatively rare and uncommonly encountered. The northernmost distribution of this genus is in Mexico where only one species, the monotypic Vampyressa thyone, is found. Here, we report the Northwesternmost record for this species, extending its distribution range to the state of Guerrero, Mexico. This record extends the limit of the species distribution by more than 153 km. We also compared this specimens with other V. thyone, and using mitochondrial cytochrome-b sequences we detected three geographic clades within the species. The new Mexican specimen represent the most divergent cytochrome-b sequence within V. thyone. We recommend a... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Mexico; Northern little yellow-eared bat; Pigmentation disorder; Range extension; Stenodermatinae. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200501 |
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| Navarro-Sigüenza,Adolfo G.; Peterson,A. Townsend. |
| Extensive debate has surrounded the application of alternative species concepts in Ornithology. The biological species concept (BSC) and phylogenetic species concept (PSC) have typically been set in opposition, with extensive debate on the relative merits of each. An alternative is the evolutionary species concept (ESC), which offers a perspective similar to that of the PSC, yet with several significant differences. To date, no major avifauna has been examined and compared among taxonomic viewpoints. Herein, we develop an alternative phylogenetic/evolutionary species taxonomy to the current BSC treatment for the more than 1000 bird species of Mexico. A total of 135 biological species was divided to produce a total of 323 phylogenetic/evolutionary species,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Species concepts; Avifauna; Mexico. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032004000200013 |
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| Maravilla-Chávez,M. Octavio; Zavala-González,Alfredo; Ortega-Rubio,Alfredo. |
| This paper describes for the first time the relative abundance, population structure and numeric variation of California sea lions in the Gulf of California, Mexico, during four different seasons. The relative abundance estimates varied from the highest 17,162 sea lions in July of 1990 (summer) to a minimum 7,470 in February of 1992 (winter), representing a reduction of 10,000 sea lions. Hypotheses about the migration of part of the population to the Pacific Ocean were compared and discussed against their residency inside the Gulf, and seasonal dispersion of individuals along this inner sea. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zalophus californianus californianus; Seasonal variations; Relative abundance; Migration; Gulf of California; Mexico. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100013 |
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| Morfin-Otero,Rayo; Garza-Gonzalez,Elvira; Aguirre-Diaz,Sara A.; Escobedo-Sanchez,Rodrigo; Esparza-Ahumada,Sergio; Perez-Gomez,Hector R.; Petersen-Morfin,Santiago; Gonzalez-Diaz,Esteban; Martinez-Melendez,Adrian; Rodriguez-Noriega,Eduardo. |
| Abstract Background Clostridium difficile infections caused by the NAP1/B1/027 strain are more severe, difficult to treat, and frequently associated with relapses. Methods A case–control study was designed to examine a C. difficileinfection (CDI) outbreak over a 12-month period in a Mexican hospital. The diagnosis of toxigenic CDI was confirmed by real-time polymerase chain reaction, PCR (Cepheid Xpert C. difficile/Epi). Results During the study period, 288 adult patients were evaluated and 79 (27.4%) patients had confirmed CDI (PCR positive). C. difficilestrain NAP1/B1/027 was identified in 31 (39%) of the patients with confirmed CDI (240 controls were included). Significant risk factors for CDI included any underlying disease (p < 0.001), prior... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clostridium difficile; Outbreak; 027 strain; Mexico. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000100008 |
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| Corzo-León,Dora Edith; Perales-Martínez,Diana; Martin-Onraet,Alexandra; Rivera-Martínez,Norma; Camacho-Ortiz,Adrian; Villanueva-Lozano,Hiram. |
| ABSTRACT Background: Invasive fungal infections (IFIs) affect >1.5 million people per year. Nevertheless, IFIs are usually neglected and underdiagnosed. IFIs should be considered as a public-health problem and major actions should be taken to tackle them and their associated costs. Aim To report the incidence of IFIs in four Mexican hospitals, to describe the economic cost associated with IFIs therapy and the impact of adverse events such as acute kidney injury (AKI), liver damage (LD), and ICU stay. Methods: This was a retrospective, transversal study carried-out in four Mexican hospitals. All IFIs occurring during 2016 were included. Incidence rates and estimation of antifungal therapy's expenditure for one year were calculated. Adjustments for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fungal infections; Antifungal therapy; Cost; Acute kidney injury; Incidence rate; Mexico. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702018000500360 |
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| Gonzalez-Losa,María del Refugio; Barrera,Ernesto Soria; Herrera-Pech,Verónica; Conde-Ferráez,Laura; Puerto-Solís,Marylin; Ayora-Talavera,Guadalupe. |
| High-risk human papillomaviruses (HR-HPV) are considered necessary for the development of cervical cancer. Furthermore, there is no doubt that some types of oral squamous cell carcinoma are associated with HR-HPV. The epidemiology of oral HPV infections in healthy subjects remains unclear due to a lack of knowledge. The objective of this study was to investigate the epidemiology of human papillomavirus infections of the oral mucosa without pathology. A cross-sectional study was performed; samples from 390 women seeking prenatal care, Pap smears, family planning or gynecological diseases were studied. Oral cells were collected by direct swab sampling. Information regarding sociodemographic status, sexual behavior, infectious diseases, contraceptive history... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Papillomavirus; Oral mucosa; HPV13; Mexico. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100301 |
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| Velázquez-Márquez,Noé; Jiménez-Aranda,Lucio Jaime; Sánchez-Alonso,Patricia; Santos-López,Gerardo; Reyes-Leyva,Julio; Vallejo-Ruiz,Verónica. |
| Cervical cancer is an important health problem in women living in developing countries. Infection with some genotypes of human papillomavirus (HPV) is the most important risk factor associated with cervical cancer. Little information exists about HPV genotype distribution in rural and suburban regions of Mexico. Thus, we determined the prevalence of HPV genotypes in women from Tlaxcala, one of the poorest states in central Mexico, and we evaluated age infection prevalence and risk factors associated with cervical neoplasm. A cross-sectional study was conducted in 236 women seeking gynecological care at the Mexican Institute for Social Security in Tlaxcala, Mexico. Cervical scrapings were diagnosed as normal, low-grade, and high-grade squamous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epidemiology; Human papillomavirus; Mexico; PCR; Squamous intraepithelial lesions. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000300027 |
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| Fuentes Mayo, Vladimir. |
| Se estudió la distribución geográfica, asociación, densidad, supervivencia in situ y factores de riesgo para las poblaciones de Coryphantha cornifera y Stenocactus anfractuosus. La búsqueda de las especies se hizo mediante recorridos de campo en los estados de México, Hidalgo, Tlaxcala, Puebla y Querétaro. En los sitios donde se encontraron estas especies, se registraron las coordenadas geográficas y altitud. Se establecieron parcelas de 400 m2 donde se marcaron todos los individuos presentes; para cada uno se obtuvieron datos morfométricos y número de costillas o tubérculos; también se registró la ocupación del hábitat, el estado fenológico y la condición sanitaria. Las plantas fueron censadas cada tres meses. C. cornifera y S. anfractuosus se encontraron... |
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Palavras-chave: Distribución geográfica; Densidad; Riesgo; Cactáceas; Doctorado; Botánica; Globose cacti; Mexico; Reproductive traits; Mating systems; Doctorado; Botánica. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/734 |
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| Registros recuperados: 154 | |
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