Cyanobacterial diversity in extreme environments in Baja California, Mexico: a polyphasic study

Cyanobacterial diversity from two geographical areas of Baja California Sur, Mexico, were studied: Bahia Concepcion, and Ensenada de Aripez. The sites included hypersaline ecosystems, sea bottom, hydrothermal springs, and a shrimp farm. In this report we describe four new morphotypes, two are marine epilithic from Bahia Concepcion, Dermocarpa sp. and Hyella sp. The third, Geitlerinema sp., occurs in thermal springs and in shrimp ponds, and the fourth, Tychonema sp., is from a shrimp pond. The partial sequences of the 16S rRNA genes and the phylogenetic relationship of four cyanobacterial strains (Synechococcus cf. elongatus, Leptolyngbya cf. thermalis, Leptolyngbya sp., and Geitlerinema sp.) are alsopresented. Polyphasic studies that include the combination of light microscopy, cultures and the comparative analysis of 16S rRNA gene sequences provide the most powerful approach currently available to establish the diversity of these oxygenic photosynthetic microorganisms in culture and in nature

Effect of diet on live weight and egg weight of backyard hens during the rainy season

The objective was to determine the effect of diet on live weight (LW) and egg weight (EW) of backyard hens (BH) during the rainy season in the Bajío region of the state of Michoacán, Mexico. Seventeen municipalities were sampled, where 101 BH (six hens/municipality) were captured and weighed and 101 eggs (six eggs/municipality) were harvested and weighed. The crops of the captured hens were removed Post-sacrifice, the organic content/crop (OCC) was classified and weighed by components, to later perform chemical compositional analysis. Data were analysed using generalised linear models and the differences between municipalities were obtained by the method of least squares means. The weight of the OCC (36.4 ± 22.4 g) was affected by the municipality (P<0.001), but not by the LW of the BH (P>0.05). Commercial feed (8.1 ± 6.0 g), grains: maize and sorghum (13.9 ± 13.5 g) kitchen waste (1.5 ± 2.9 g), herbaceous (0.6 ± 0.9 g) and insects (0.3 ± 0.7 g) were found in the crop. According to the commercial feed (COF) component, two feeding systems (FS) were identified: traditional FS, without COF and nontraditional FS, with COF. The diets of both FS were similar (P>0.05) in nutritional composition and do not meet the nutritional requirements of the hens. The LW (1.567 ± 0.316 kg) and EW (51.3 ± 1.0 g) of the BH cannot be completely attributed to the diet consumed during the rainy season

Governance for Sustainability in an Organization in Central Mexico

Often, the total quality has been instrumented before being weighted. The strategies even precede a diagnosis in Mexican organizations, but in an opposite sense, the present work set out to establish the reliability and validity of an instrument to measure the perception of total quality based on three indicators related to management. , production and transfer of knowledge. A nonperimental study was carried out with a non-probabilistic selection of 124 administrative staff and employees from an organization in central Mexico. From a structural model ⌠X2 = 123,24 (23df) p = 0,010; GFI = 0,990; CFI =,991; IFI = 0,993; RMSEA = 0,007⌡, it was found that management affects production (0,38) and this about the total perceived quality (0,35), although there are lines of research concerning empathy, commitment, entrepreneurship, satisfaction and happiness in relation to the implementation of continuous improvements to the quality of processes and products

Un análisis transversal del ecoturismo: Arte místico y riesgo alternativo

En el marco de promoción del emprendimiento local para el desarrollo regional sustentable, los estudios del turismo se han centrado en el análisis de la experiencia vital como antecedente de la satisfacción turística y el retorno vacacional, pero sin considerarlos como parte de un ciclo de recreación y esparcimiento que podría ser explicado desde las representaciones sociales. En tal sentido, se llevó a cabo un trabajo exploratorio, transversal y cualitativo con una selección de informantes, considerando sus recorridos a un museo natural surrealista del centro de México. Las interpretaciones en torno a las respuestas a preguntas derivadas de las categorías de núcleo de esparcimiento, periferia recreativa y experiencia vacacional muestran similitudes en cuanto a la búsqueda de un significado del recorrido y el escenario, pero también diferencias en cuanto a la integración con el escenario, orientando futuras líneas de investigación hacia las diferencias entre generacione

Efecto de la inoculación con hongos micorrízicos en el rendimiento de avena forrajera

Objective: The objective of the present study was to evaluate the effect of inoculation with two species of mycorrhizal fungi on the yield of forage oats. Design / methodology / approach: The method of pelletization and seed coating was used; The sowing went to volley. A completely randomized design with factorial arrangement (2x3x3) was used as factors: the two varieties, the HMA Glomus cubense and Glomus fasciculatum with a control and fertilization at 50% and 100% with a control with four repetitions. Results: The Chihuahua variety obtained a better yield, leaf stem ratio, leaf area index, number of leaves, leaf death, stem density and leaf death (2.50); in the other variables they were statistically equal. The Glomus cubense species was superior to Glomus fasciculatum in the yield variables (6.92 t DM ha-1) and in the death of leaves (4.68), but in the leaf area index (135.02), Glomus fasciculatum exceeded Glomus cubense. Limitations of the study / implications: yield in fodder production, producers apply high amounts of chemical fertilizers, whose excessive use negatively affects the soil resource. Findings / conclusions: The Chihuahua variety has better behavior and Glomus cubense exceeds Glomus fascicucatum in performanceObjetivo: El objetivo del presente estudio fue evaluar el efecto de inoculación con dos especies de hongos micorrízicos en el rendimiento de avena forrajera. Diseño/metodología/aproximación: Se utilizó el método de peletización y recubrimiento de semilla; la siembra fue al voleo. Se utilizó un diseño completamente al azar con arreglo factorial (2x3x3) se consideró como factores: las dos variedades, los HMA Glomus cubense y Glomus fasciculatum con un testigo y la fertilización al 50% y al 100% con un testigo con cuatro repeticiones. Resultados: La variedad Chihuahua obtuvo un mejor rendimiento, relación hoja tallo, índice de área foliar, número de hojas, muerte de hojas, densidad de tallos y en la muerte de hojas (2.50); en las demás variables fueron estadísticamente iguales. La especie Glomus cubense fue superior al Glomus fasciculatum en las variables rendimiento (6.92 t MS ha-1) y en la muerte de hojas (4.68), pero en el índice de área foliar (135.02), Glomus fasciculatum superó a Glomus cubense. Limitaciones del estudio/implicaciones: el rendimiento en la producción de forraje, los productores aplican cantidades elevadas de fertilizantes químicos, cuyo uso excesivo afecta negativamente el recurso suelo. Hallazgos/conclusiones: La variedad Chihuahua tiene mejor comportamiento y Glomus cubense en supera en rendimiento a Glomus fascicucatu

Consecuencias del estrés calórico sobre la reproducción del ganado vacuno

Heat stress represents one of the major environmental factors that adversely affect the reproductive performance of cattle. In this paper the behavioral adjustments, physical mechanisms and physiological responses to heat loss are described; bos indicus adaptive advantages with respect to bos Taurus, pathophysiology of heat stress and heat stress effects in animal reproduction, both the male and the female.El estrés calórico representa unos de los principales factores del medio ambiente que repercuten negativamente en el desempeño reproductivo del ganado vacuno. En este trabajo se describen los ajustes conductuales, mecanismos físicos y respuestas fisiológicas para la pérdida calórica; ventajas adaptativas del bos indicus con respecto al bos Taurus, fisiopatología del estrés calórico y repercusiones del estrés calórico en la reproducción animal, tanto en el macho como en la hembra

Temporal differences in blood meal detection from the midguts of Triatoma infestans

We used genus/species specific PCRs to determine the temporal persistence of host DNA in Triatoma infestans experimentally fed on blood from six common vertebrate species: humans, domestic dogs, guinea pigs, chickens, mice, and pigs. Twenty third or fourth instar nymphs per animal group were allowed to feed to engorgement, followed by fasting-maintenance in the insectary. At 7, 14, 21, or 28 days post-feeding, the midgut contents from five triatomines per group were tested with the respective PCR assay. DNA from all vertebrate species was detected in at least four of five study nymphs at seven and 14 days post-feeding. DNA of humans, domestic dogs, guinea pigs, pigs, and chickens were more successfully detected (80-100%) through day 21, and less successfully (20-100%) at day 28. Findings demonstrate that species-specific PCRs can consistently identify feeding sources of T. infestans within two weeks, a biologically relevant time interval