Number of results to display per page
Search Results
31232. The Editor wishes to extend his gratitude to those persons who have kindly refereed manuscripts for this volume
- Type:
- article, model:article, and TEXT
- Language:
- English
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31233. The Editorial board
- Type:
- article, model:article, and TEXT
- Language:
- English
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31234. The Effect of a Unilateral Muscle Transplantation on the Muscle Fiber Type and the MyHC Isoform Content in Unoperated Hind Limb Slow and Fast Muscles of the Inbred Lewis Rats
- Creator:
- Zachařová, G., Vadászová, A., Smerdu, V., Asmussen, G., and Soukup, T.
- Type:
- article, model:article, and TEXT
- Subject:
- Rat hind limb muscle, Muscle fiber phenotype, Stereology, Immunocytochemistry, Gel electrophoresis, Influence of surgery, and Muscle transplantation
- Language:
- English
- Description:
- To reveal the effect of foreign innervation and altered thyroid status on fiber type composition and the myosin heavy chain (MyHC) isoform expression in the rat slow soleus (SOL) and fast extensor digitorum longus (EDL) muscles, a method of heterochronous isotransplantation was developed. In this experimental procedure, the SOL or EDL muscles of young inbred Lewis rats are grafted either into the host EDL or SOL muscles of adult rats of the same strain with normal or experimentally altered thyroid status. To estimate the extent of fiber type transitions in the transplanted muscles, the SOL and EDL muscle from the unoperated leg and unoperated muscles from the operated leg could be legitimately used as controls, but only when the experimental procedure itself does not affect these muscles. To verify this assumption, we have compared the fiber type composition and the MyHC isoform content of unoperated contralateral SOL and EDL muscles and ipsilateral unoperated SOL muscle of experimental rats after unilateral isotransplantation into the host EDL muscle with corresponding muscles of the naive rats of the same age and strain. We provide compelling evidence that the unilateral heterochronous isotransplantation has no significant effect on the fiber type composition and the MyHC isoform content of unoperated muscles of experimental animals. Hence, these muscles can be used as controls in our grafting experiments.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31235. The effect of abscisic acid and methyl jasmonate on carbonic anhydrase activity in pea
- Creator:
- Lazova, G. N., Kicheva, M. I., and Popova, L. P.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- intercellular CO2 concentration, net photosynthetic rate, plant hormones, stomatal conductance, and Pisum sativum
- Language:
- Multiple languages
- Description:
- Short-term (2 h) treatment with 10 µM abscisic acid decreased stomatal conductance and net photosynthetic rate, and increased carbonic anhydrase activity in pea seedlings. The treatment with 10 µM methyl jasmonate did not significantly affect these parameters. and G. N. Lazova, M. I. Kicheva, L. P. Popova.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31236. The effect of additional red irradiation on the photosynthetic apparatus of Pisum sativum
- Creator:
- Topchiy, N. M., Sytnik, S. K., Syvash, O. O., and Zolotareva, O. K.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- chlorophyll, light-emitting diodes, light-harvesting complex, non-photochemical quenching, photosystem 2, Pisum sativum, photochemical quenching, and spectral composition of radiation
- Language:
- Multiple languages
- Description:
- Pisum sativum (L.) plants were grown under "white" luminescent lamps, W [45 µ mol(quantum) m-2 s-1] or under the same irradiation supplemented with narrow spectrum red light-emitting diodes (LEDs), RE [λmax = 660 nm, Δλ = 20 nm, 40 µmol(quantum) m-2 s-1]. Significant differences in the chlorophyll (Chl) a fluorescence parameters, degree of State 1-State 2 transition, and the pigment-protein contents were found in plants grown under differing spectral composition. Addition of red LEDs to the "white light" resulted in higher effective quantum yield of photosystem 2 (PS2), i.e. F'v/F'm, linear electron transport (ϕPS2), photochemical quenching (qP), and lower non-photochemical quenching (qN as well as NPQ). The RE plants were characterised by higher degree State 1-State 2 transition, i.e. they were more effective in radiant energy utilisation. Judging from the data of "green" electrophoresis of Chl containing pigment-protein complexes of plants grown under various irradiation qualities, the percentage of Chl in photosystem 2 (PS2) reaction centre complexes in RE plants was higher and there was no difference in the total Chl bound with Chl-proteins of light-harvesting complexes (LHC2). Because the ratio between oligomeric and monomeric LHC2 forms was higher in RE plants, we suggest higher LHC2 stability in these ones. and N. M. Topchyi ... [et al.].
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31237. The effect of administration of estradiol and testosterone on body growth of young male rats
- Creator:
- Číkoš, Š., Kuchár, S., and Koppel, J.
- Type:
- article, model:article, and TEXT
- Subject:
- body growth, Estrogens, and androgens
- Language:
- English
- Description:
- The influence of estradiol and testosterone on body growth of young male Wistar rats was investigated. In the first experiment, estradiol was given to intact ad libitum fed male rats at 32, 37 and 42 days of age. Moreover, two untreated groups of animals were used: one was fed rcstrictedly according to the food intake of animals receiving estradiol and another was fed ad libitum. The animals were sacrificed at 47 days of age. Both untreated groups of animals achieved significantly higher body weight and length of tibia than estradiol treated animals. Also the growth of the tail of untreated animals was more intensive than that of estradiol treated animals. In the second experiment, estradiol was given to intact ad libitum fed male rats at 30, 35 and 45 days of age. Moreover, testosterone was given to a half of these animals at 45, 50 and 55 days of age. The animals were sacrificed at 60 days of age. Administration of testosterone significantly increased the growth of the tail and tibia in comparison to the animals which did not receive testosterone after estradiol administration. The results of the present study show that the inhibitory effect of estradiol on body growth of young male rats is not only the result of decreased food intake and that testosterone can improve the skeletal growth of male rats altered by previously given estradiol.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31238. The effect of altered sink-source relations on photosynthetic traits and matter transport during the phase of reproductive growth in the annual herb Chenopodium album
- Creator:
- Yasumura, Y.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- leaf senescence, nitrogen resorption, photosynthetic nitrogen use efficiency, and soluble protein
- Language:
- Multiple languages
- Description:
- Annual plants transport a large portion of carbohydrates and nitrogenous compounds from leaves to seeds during the phase of reproductive growth. This study aimed to clarify how reproductive growth affects photosynthetic traits in leaves and matter transport within the plant in the annual herb Chenopodium album L. Plants were grown in pots and either reproductive tissues or axillary leaves were removed at anthesis. Matter transport was evaluated as temporal changes in dry mass (as a substitute of carbohydrates) and nitrogen content of aboveground organs: leaves, axillary leaves, stems and reproductive tissues. Photosynthetic capacity (light-saturated photosynthetic rate under ambient CO2 concentration), nitrogen, chlorophyll and soluble protein content were followed in the 20th leaf that was mature at the start of the experiment. Removal of reproductive tissues resulted in accumulation of dry mass in leaves and axillary leaves, and accumulation of nitrogen in stem as nitrogen resorption from leaves and axillary leaves proceeded with time. Removal of axillary leaves proportionally reduced dry mass and nitrogen allocation to reproductive tissues, thus affecting the quantity but not quality of seeds. Removal treatments did not alter the time course of photosynthetic capacity, nitrogen, chlorophyll or soluble protein content during senescence in the 20th leaf, but changed the photosynthetic capacity per unit of leaf nitrogen according to demand from reproductive tissues. Together, the results indicate that reproductive tissues affected carbon and nitrogen economy separately. The amount of carbon was adjusted in leaves through photosynthetic capacity and carbohydrate export from them, and the amount of nitrogen was adjusted by transport from stem to reproductive tissues. The plant's ability to independently regulate carbon and nitrogen economy should be important in natural habitats where the plant carbon-nitrogen balance can easily be disturbed by external factors.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31239. The effect of ambient temperature on larvae of Scatopsciara cunicularius (Diptera: Sciaridae) feeding on the thallose liverwort Marchantia polymorpha
- Creator:
- Sawangproh, Weerachon, Ekroos, Johan, and Cronberg, Nils
- Format:
- print, počítač, and online zdroj
- Type:
- article, články, journal articles, model:article, and TEXT
- Subject:
- Zoologie, dvoukřídlí, smutnicovití, Diptera, Sciaridae, Scatopsciara cunicularius, gnat larva, sciarid fly, biological control, Marchantia polymorpha, 2, and 59
- Language:
- English
- Description:
- Herbivory on liverworts is rarely reported. We studied the effects of feeding by larvae of the sciarid fly Scatopsciara cunicularius on the growth of the thalloid liverwort Marchantia polymorpha at two different constant temperatures, 12°C and 22°C. Larvae reared at the lower temperature fed slower and over a longer period of time, which resulted in more damage and a greater reduction in the growth of the liverwort than that caused by those reared at the higher temperature. The reduction in growth of the liverwort was positively density-dependent in terms of number of larvae at both temperatures. These results indicate that the larvae of S. cunicularius are likely to be an effective means of controlling M. polymorpha, which is a common weed in plant nurseries and greenhouse cultures., Weerachon Sawangproh, Johan Ekroos, Nils Cronberg., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
31240. The effect of amphiphilic peptide surfactants on the light-harvesting complex II
- Creator:
- Liu, S., Qiu, Y., and Yu, D.-Y.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- botanika, botany, circular dichroism, light-harvesting complex II, pepside surfactants, and thermal stability
- Language:
- Multiple languages
- Description:
- The peptide surfactants are amphiphilic peptides which have a hydrophobic tail and a hydrophilic head, and have been reported to stabilize and protect some membrane proteins more effectively than conventional surfactants. The effects of a class of peptide surfactants on the structure and thermal stability of the photosynthetic membrane protein lightharvesting complex II (LHCII) in aqueous media have been investigated. After treatment with the cationic peptide surfactants A6K, V6K2, I5K2 and I5R2, the absorption at 436 nm and 470 nm decreased and the absorption at 500-510 nm and 684-690 nm increased. Moreover, the circular dichroism (CD) signal intensity in the Soret region also decreased significantly, indicating the conformation of some chlorophyll (Chl) a, Chl b, and the xanthophyll molecules distorted upon cationic peptide surfactants treatment. The anionic peptide surfactants A6D and V6D2 had no obvious effect on the absorption and CD spectra. Except for A6D, these peptides all decreased the thermal stability of LHCII, indicating that these peptides may reconstitute protein into a less stable conformation. In addition, the cationic peptide surfactants resulted in LHCII aggregation, as shown by sucrose gradient ultracentrifugation and fluorescence spectra. and S. Liu, Y. Qiu, D.-Y. Yu
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public