Forty alpaca kids, comprising 20 huacaya and 20 suri, and 20 llama “chaku” (or woolly type), were chosen for a comparative investigation of the fiber and cuticular attributes based on fiber diameter, number of cuticular scales per 100 µm of fiber length, and scale height. Out of the three parameters investigated, the number of cuticular scales proved to be a valid diagnostic trait in distinguishing suri fleece from both huacaya and llama fleeces. A further characterization of the suri fleece was obtained by considering the frequency distribution of both fiber diameter and number of cuticular scale classes. The suri fleece was clearly different from both the huacaya and llama in that it possessed the highest percentage of fibers with less than eight scales, the lowest percentage of fibers with more than nine scales, along with the lowest percentage of fibers with a diameter of more than 35 µm. The validity of these classification criteria was fully supported by a classification discriminant analysis based on the jointed investigation of the data related to scale and diameter frequency classes, whose output was a 100% correct classification of the suri specimens along with an 85.7% and 71.4% of cases correctly classified in huacaya and llama, respectively.
ObjectiveThis study aimed to assess the effects of using a single culture medium not
renewed on day 3 on the development of the embryo up to the blastocyst
stage.MethodsThe study was carried out in the Assisted Reproduction Laboratory of
Clínica Miraflores in the period ranging from April to December of
2016. The study included 589 human embryos obtained from 82 couples
submitted to IVF/ICSI with donor oocytes. The couples were randomly divided
into two groups: group 1 (medium renewed on day 3) and group 2 (medium not
renewed on day 3).ResultsSignificant differences in pregnancy rates, implantation rates, and
blastocyst formation were not observed.ConclusionNo statistically significant difference was found between the groups with
respect to the analyzed parameters. However, a non-significant trend was
observed in favor of the group without medium renewal for clinical pregnancy
and positive pregnancy rates (β-hCG).
El plomo es un agente contaminante presente en el ambiente producto de la minería, manufactura industrial y la quema de combustibles fósiles. Se ha observado que individuos expuestos ocupacionalmente a plomo presentan disfunción de las glándulas sexuales, disminución de la concentración espermática, disminución de la motilidad y algunas otras alteraciones.
El objetivo de este estudio fue evaluar el efecto del acetato de plomo sobre la capacitación espermática. El medio que se utilizó para la capacitación fue Tyrode libre de Ca+, suplementado con Albumina de Bovino Sérica (BS A) por 30 minutos a 37ºC, 6% CO y bajo concentraciones de Pb(CH3COO) a 0.6μg/dL; 6μg/dL y 66μg/dL. Se realizó la valoración de la motilidad y vitalidad espermática pre y post capacitación. Como resultados se obtuvo una disminución en la vitalidad con medias de 17.99 y 46.99 para la concentración de 66μg/dL, además se observaron efectos en la motilidad, con medias de 1.2 y 26 a la misma concentración. En conclusión, el acetato de plomo Pb(CH3COO)2 tiene efectos, sobre la motilidad y vitalidad, disminuyendo los porcentajes óptimos durante la capacitación espermática.
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