Browsing by Subject "Temperature"

Now showing 1 - 7 of 7
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    Analysis of the amount of lost fluids, some blood components and mineral salts in volleyball under hot weather conditions
    (Universidad de Murcia, Servicio de Publicaciones, 2023) Badwi Shbeeb, Huda; Saeed Almousawi, Suhad Qasim; Mousa Jawad, Sundus
    The research objective was to study the amount of lost fluids, some blood components and mineral salts in volleyball players under hot weather conditions. The sample of the present study was composed of 12 volleyball players of Al-Sinaa Club (Baghdad, Iraq) in the 2022/2023 season. The variables analyzed in this study were: Heart rate before and after exercise, internal and external body temperature before and after exertion, potassium ion, sodium ion, calcium ion, and the amount of fluid lost (the player's weight) before and after the exercise. The tests were conducted at a temperature between 42-47 degrees Celsius. The maximum anaerobic exercise was performed with volleyball. The results showed that to play volleyball under hot weather conditions (42-47 degrees Celsius) significantly increased the following variables in volleyball players: heart rate, external body temperature, internal body temperature, sodium ion and calcium ion. However, potassium ion significantly decreased. Therefore, training in hot weather has positive physical repercussions. The authors recommend to train in different weather conditions.
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    CO2 laser therapy accelerates the healing of ulcers in the oral mucosa by inducing the expressions of heat shock protein-70 and tenascin C
    (Universidad de Murcia. Departamento de Biología Celular e Histología, 2019) Gang, Luo; Oka, Kyoko; Ohki, Shirabe; Rikitake, Mihoko; Itaya, Satoshi; Tamura, Shougo; Toda Nakamura, Masako; Ogata, Kayoko; Kira Tatsuok, Michiko a; Ozaki, Masao
    The treatment of ulceration or stomatitis with laser therapy is known to accelerate healing and relieve pain, but the underlying biological mechanism is not fully understood. The present study used a mouse model of ulceration to investigate the molecular mechanisms by which CO2 laser therapy accelerated the wound healing process. An ulcer was experimentally created in the palatal mucosa of the mouse and irradiated with light from a CO2 laser. Compared with controls (no irradiation), laser irradiation induced the proliferation of epithelial cells and faster re-epithelialization of the wound area. Immunohistochemistry experiments showed that heat shock protein-70 (HSP70) was expressed mainly in the epithelium of normal palatal tissue, whereas there was little tenascin C (TnC) expression in the epithelium and mesenchyme under normal conditions. Laser irradiation induced HSP70 mRNA and protein expression in the lamina propria as well as TnC expression in the mesenchyme underlying the renewing epithelium. Epithelial cells and fibroblasts were exposed to heated culture medium or laser irradiation to establish whether hyperthermia mimicked the effect of laser irradiation. Culture of fibroblasts in heated medium increased the expressions of both TnC and TGF-β1, whereas laser irradiation induced only TnC expression. The present study indicates that CO2 laser irradiation exerts a photobiogenic effect to up-regulate TnC expression without inducing TGF-β1 expression. We suggest that CO2 laser therapy has an advantage over thermal stimulation.
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    Efecto del sustrato y la temperatura en el control biológico de Phytophthora capsici en pimiento (Capsicum annuum L.)
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 2005) Ezziyyani, Mohammed; Requena, María Emilia; Pérez Sánchez, María Consuelo; Candela Castillo, María Emilia; Biología Vegetal; Facultad de Biología
    El objetivo de este trabajo fue comparar el efecto de la temperatura y el pH sobre la capacidad antagónica in vitro e in vivo del hongo Trichoderma harzianum y las bacterias Burkholderia cepacia y Streptomyces rochei Ziyani, sobre la tristeza causada por Phytophthora capsici. Los ensayos se realizaron en plantas de pimiento, crecidas a partir de semillas tratadas con cada antagonista. En ensayos in vitro se realizaron confrontaciones duales de cada antagonista con el patógeno P. capsici analizando macroscópicamente las interacciones y las capacidades antagónicas a temperaturas de 23 y 30ºC y a distintos valores de pH. Utilizamos una escala de 0 a 4 donde 0 equivale a ninguna invasión de la superficie de la colonia de P. capsici y 4 significa la invasión total de la colonia del patógeno y esporulación sobre la misma. Con esa escala se obtuvo que la capacidad antagónica de los tres antagonistas fue 4. La temperatura óptima de antagonismo fue 30ºC para las bacterias St. Rochei Ziyani y B. cepacia y 25ºC para el hongo T. harzianum. El pH 4,5 no afecta la acción inhibidora de las bacterias, incluso la favorece, y en cambio, a ese pH la colonia de T. harzianum reduce su densidad y color aunque no se afecta su capacidad antagónica. Los trabajos in vivo se realizaron en cámara de cultivo preferentemente a 23ºC porque aunque la agresividad y la velocidad de la necrosis en tallos infectados es mayor a 30ºC, la respuesta defensiva de la planta está favorecida a 23ºC. El efecto del pH en el crecimiento de las plántulas se realizó in vivo en suelos de pHs 5,61, 5,44, 4,95, 4,58, 4.20 y 3.48, obtenidos en mezclas de suelos formados por turba, arena y disolución de KCl 1M, en diferentes proporciones. En el invernadero la intensidad de inhibición varió según el pH del medio de cultivo y los antagonistas. La reducción efectiva de la enfermedad fue de un 3,25 (con el hongo T. harzianum), un 2,10 (con la bacteria B. cepacia) y un 1,85 (con la bacteria St. Rochei Ziyani) lo cual equivale a una reducción porcentual del 37%, 42% y 65% respectivamente. El control se realizó en suelos de pH= 4,58 obtenidos con mezcla de turba en una disolución de KCl 1M, a 25 2ºC. Se usaron distintas concentraciones de las bacterias, pero no se observó diferencias en el grado de reducción de la tristeza. También se estudió la interacción en tallos a nivel estructural mediante microscopía electrónica de transmisión en la interacción C. annuum-P. capsici.
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    Mimicking the temperature gradient between the sow’s oviduct and uterus improves in vitro embryo culture output
    (Oxford University Press, 2020-07-09) García Martínez, Soledad; Latorre Reviriego, Rafael Manuel; Sánchez-Hurtado, M. A.; Sánchez-Margallo, F. M.; Bernabò, N.; Romar Andrés, Raquel; López Albors, Octavio Miguel; Coy Fuster, Pilar; Anatomía y Anatomía Patológica Comparada
    This work was designed to determine temperature conditions within the reproductive tract of the female pig and study their impact on ARTs. Temperatures were recorded using a laparo-endoscopic single-site surgery assisted approach and a miniaturized probe. Sows and gilts were used to address natural cycle and ovarian stimulation treatments, respectively. According to in vivo values, IVF was performed at three temperature conditions (37.0°C, 38.5°C and 39.5°C) and presumptive zygotes were cultured in these conditions for 20 h, while further embryo culture (EC) (21–168 h post-insemination) was maintained at 38.5°C. After 20 h, different fertility parameters were assessed. During EC, cleavage and blastocyst stages were evaluated. Sperm membrane fluidity at the experimental temperatures was studied by using differential scanning calorimetry and fluorescence recovery after photobleaching techniques. An increasing temperature gradient of 1.5°C was found between the oviduct and uterus of sows (P < 0.05) and when this gradient was transferred to pig in vitro culture, the number of poly-nuclear zygotes after IVF was reduced and the percentage of blastocysts was increased. Moreover, the temperature transition phase for the boar sperm membrane (37.0°C) coincided with the temperature registered in the sow oviduct, and sperm membranes were more fluid at 37.0°C compared with those of sperm incubated at higher temperatures (38.5°C and 39.5°C). These data suggest that there may be an impact of physiological temperature gradients on human embryo development.
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    Reliability of an infrared auditory thermometer in the measurement of oral temperature
    (Medicina Oral, S.L., 2008-06-01) Moya Villaescusa, María José; Sánchez Pérez, A.; Bermejo Fenoll, Ambrosio; Dermatología, Estomatología, Radiología y Medicina Física
    Aim: To evaluate the reliability of the measurements obtained from different parts of the oral cavity using an infrared auditory thermometer, and to contrast these results with those obtained from the axilla and auditory canal. Study design: A comparative descriptive design was used to establish differences between the temperature recordings made in 66 healthy volunteers with an infrared auditory thermometer applied to different parts of the body (oral cavity and left ear) versus the recordings obtained with a glass mercury thermometer in the axillary zone. The study sample was balanced with respect to gender, and the mean age was 21.15 (± 1.61) years. Results: The largest standard deviation of all the locations corresponded to the left ear. This variable did not present a normal distribution. However, there were no statistically significant differences among the consecutive measurements made in the different anatomical (oral or axillary) regions. Conclusions: The thermal device used in this study seems to fulfill most of the requirements of an ideal clinical thermometer for yielding objective information on body temperature. It is easy to use, noninvasive, inexpensive and rapid. The temperature in the oral cavity is very representative of body temperature.
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    Seasonal and daily plasma melatonin rhythms and reproduction in senegal sole kept under natural photoperiod and natural or controlled water temperature
    (2007-08-31) Vera, L.M.; De Oliveira, C.; López Olmeda, J.F.; Ramos, J.; Mañanós, E.; Madrid, J.A.; Sánchez Vázquez, F.J.; Fisiología
    The melatonin daily rhythm provides the organism with photoperiod-related information and represents a mechanism to transduce information concerning time of day. In addition, the duration and amplitude of the nocturnal elevation gives information about duration and thus the time of year. In this study we investigate the existence of an annual rhythm of plasma melatonin in the Senegal sole. Differences in plasma melatonin levels between fish kept at a controlled temperature (17-20 ºC) and those exposed to the environmental temperature cycle (11.5-25 ºC) were also examined throughout the year. Spawning was registered in both groups to determine the time of year in which reproductive rhythms occurred. Our results pointed to the existence of an annual rhythm of plasma melatonin at mid-darkness (MD), with the highest levels (203 ± 44 pg/ml) observed when water temperature reached 25 ºC. Water temperature influenced nocturnal, but not diurnal melatonin. Daily melatonin rhythms showed seasonal differences, with higher mean nocturnal levels during the summer solstice (138 ± 19 pg/ml) and autumn equinox (149 ± 49 pg/ml). When animals were kept at a constant temperature throughout the year, plasma melatonin levels differed from those observed in fish exposed to the environmental temperature cycle. Regarding the reproductive rhythms, spawning was observed at the end of spring in sole kept under natural temperature conditions, whereas no spawning at all was registered in sole reared at a constant temperature. In short, both photoperiod and temperature affected melatonin 3 production in the Senegal sole, transducing seasonal information and controlling annual reproductive rhythms
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    Señales de cambio climático en la provincia de Santa Fe : tendencias del período 1960-2019.
    (Universidad de Murcia, Servicio de Publicaciones., 2024) Toffoli, G. D.; Acetta, P. M.; Mendez, L. A.; Costamagna, D.; Leva, P. E.
    During the last decades, an increase in extreme weather events, precipitation and warm nights has been observed, while a decrease in cold nights and days with frost has been recorded in the central region of Argentina. The objective of this study is to evaluate the climate change indices derived from temperature and precipitation of greatest relevance to the province of Santa Fe (Argentina), based on the methodologies and indices proposed by the team of experts in detection, monitoring and indices of climate change. Daily data from six locations in the province of Santa Fe were used in the period evaluated (1960-2019). Positive annual trends were found in the number of warm and tropical nights, minimum daily temperature, days with heavier rain, and amount of annual precipitation; On the other hand, negative trends were manifested in the number of days with frost and in the daily thermal amplitude. The results found are consistent with numerous works related to the study of climate change in recent decades in multiple stations located in South America and central Argentina.