PL
 |
EN
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 7

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Evaluation of Different Scales for Measurement of Perceived Physical Strain During Performance of Manual Tasks
100%
Hernandez L. , Alhemood A. , Genaidy A. M. , Karwowski W.
International Journal of Occupational Safety and Ergonomics
|
2002
|
tom Vol. 8, No. 4
413--432
EN
The main objective of this study was to evaluate different scales of perceived strain during the performance of various physical tasks. A total of 52 male and female participants took part in 4 experiments to achieve the study objective. The results suggest that a bipolar comfort-discomfort scale is a more appropriate instrument than a discomfort scale for assessing cumulative physical stresses at work, especially at the beginning of the shift. For assessing discomfort at the end of the work shift, a unipolar scale may also be used. On the basis of the obtained results, red, green, and yellow zones are suggested to establish priorities for work redesign efforts in ergonomic control programs.
2
Content available Ethylene mediates in the early oxidative stress induced by mercury
88%
Montero-Palmero M. , Martin-Barranco A. , Alonso J. , Escobar C. , Hernandez L.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2013
|
tom 94
|
nr 2
3
Content available remote Role of potassium channels in rabbit intestinal motility disorders induced by 2,2'-azobis [2-amidinopropane] dihydrochloride [AAPH]
75%
Hernandez L. , Grasa L. , Fagundes D. S. , Gonzalo S. , Arruebo M. P. , Plaza M. A. , Murillo M. D.
Journal of Physiology and Pharmacology
|
2010
|
tom 61
|
nr 3
279-286
EN
Oxidative stress appears to play a role in the pathogenesis of several inflammatory gastrointestinal diseases. Changes in intestinal motility have been reported in different models of intestinal inflammation. The initiating factor of altered motility could be an alteration of gut redox status. The aim of this study was to investigate the effect of oxidative stress evoked by 2, 2´-azobis (2-amidinopropane) dihydrochloride (AAPH) on the intestinal motility of rabbit duodenum and the possible contribution of different K+ channels in mediating this response. Whole thickness segments of rabbit duodenum were suspended in the direction of the longitudinal or circular smooth muscle fibres in an organ bath to study the effects of AAPH alone, or in the presence of different K+ channel blockers on the amplitude, frequency and tone of spontaneous contractions. In circular muscle, AAPH 20 mM induced a reduction of the amplitude, the frequency and tone of the spontaneous contractions. In longitudinal muscle, AAPH 10 mM induced a reduction of the amplitude and tone of the spontaneous contractions. The reduction of the amplitude and tone induced by AAPH was reverted by BaCl2 (1 mM) and TEA (5 mM). Charybdotoxin (100 nM) and iberiotoxin (100 nM) only reverted the reduction of the tone induced by AAPH. In conclusion, our results show that the peroxyl radicals released by AAPH reduced the amplitude and the tone of the spontaneous contractions of the longitudinal smooth muscle from rabbit small intestine. Inward rectifier and intermediate and large-conductance Ca2+-activated K+ channels could be involved in these effects.
4
Sodium azide mutagenesis within temporary immersion bioreactors modifies sugarcane in vitro micropropagation rates and aldehyde, chlorophyll, carotenoid, and phenolic profiles
63%
Gomez D. , Hernandez L. , Martinez J. , Escalante D. , Zevallos B. E. , Yabor L. , Trethowan R. , Beemster G. T. S. , Sershen , Lorenzo J. C.
Acta Physiologiae Plantarum
|
2019
|
tom 41
|
nr 07
EN
Chemical mutagens such as sodium azide (NaN₃) have been widely used to increase genetic variability in crops, but the undirected mutations induced can have undesirable effects, which need to be characterized. This study investigated the effects of in vitro NaN₃ (0–0.45 mM) exposure (30 days) on the micropropagation of sugarcane within temporary immersion bioreactors (TIB). Shoot multiplication rate and cluster fresh weight, and aldehyde, phenolic, carotenoid, and chlorophyll levels were measured on in vitro produced shoots. The soluble phenolic content of the culture medium was also assessed. NaN₃ concentration was negatively correlated with sugarcane shoot multiplication rate and fresh weight; at 0.45 mM NaN₃, these parameters were only 20% and 39% that of the untreated control, respectively. Shoot multiplication rate and fresh weight, and chlorophyll a and b levels were negatively correlated with NaN₃ concentration. In contrast, malondialdehyde, other aldehyde, carotenoid, and exuded phenol levels were positively correlated with NaN₃ concentration. Statistical comparisons suggest that shoot multiplication rate and the biochemical parameters that were positively correlated with NaN₃ concentration may be the most suitable indicators of stress when optimizing the concentration of NaN₃ for sugarcane explants. An interpolated 50% reduction of multiplication rates at 0.23 mM NaN₃ suggests that this concentration to be suitable for TIB-based induction of mutagenesis in shoots and eventual production of agriculturally useful mutants.
5
Maize seed cryo-storage modifies chlorophyll, carotenoid, protein, aldehyde and phenolics levels during early stages of germination
63%
Arguedas M. , Gomez D. , Hernandez L. , Engelmann F. , Garramone R. , Cejas I. , Yabor L. , Martinez-Montero M. E. , Lorenzo J. C.
Acta Physiologiae Plantarum
|
2018
|
tom 40
|
nr 06
6
Effects of Teramnus labialis (L.f.) Spreng seed cryopreservation on subsequent seed and seedling growth and biochemistry
51%
Acosta J. , Perez L. , Linares C. , Hernandez L. , Escalante D. , Perez A. , Zevallos B. E. , Yabor L. , Martinez-Montero M. E. , Cejas I. , Fontes D. , Sershen , Lorenzo J. C.
Acta Physiologiae Plantarum
|
2020
|
tom 42
|
nr 01
7
Temporary immersion bioreactors (TIB) provide a versatile, cost-effective and reproducible in vitro analysis of the response of pineapple shoots to salinity and drought
51%
Gomez D. , Hernandez L. , Valle B. , Martinez J. , Cid M. , Escalona M. , Hernandez N. , Beemster G. T. S. , Tebbe C. C. , Yabor L. , Lorenzo J. C.
Acta Physiologiae Plantarum
|
2017
|
tom 39
|
nr 12
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.