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11.
Peter A. Roussos Nikoleta-Kleio Denaxa Theodoros Damvakaris Vassilios Stournaras Ioannis Argyrokastritis 《Scientia Horticulturae》2010
Two years old self-rooted Koroneiki olive trees (Olea europaea L.) were subjected to two irrigation regimes, i.e. the fully irrigated and the severely water stressed trees, while they were treated with three alleviating products of different mode of action. The products used were the osmolyte glycine betaine, the antioxidant Ambiol and the heat and irradiance reflecting kaolin clay particles. The effects of product application and water regime on leaf characteristics, shoot and root growth, photosynthesis, leaf compatible solids (carbohydrates) concentration and yield were evaluated. All products applied, exhibited significant alleviating action, based on the relative alleviation index. Irrigated trees exhibited greater growth than drought stressed ones, while the ameliorating products maintained the water content of the leaves under drought conditions and resulted in lower leaf tissue density. On the other hand carbon assimilation rate, stomatal conductance and intrinsic water use efficiency were significantly reduced under drought stress, while the opposite stood for intercellular CO2. Drought stress resulted in elevated sucrose leaf concentration, while the application of Ambiol increased stachyose concentration and that of glycine betaine did the same with the mannitol concentration. Among the alleviating products tested in this experiment Ambiol and glycine betaine had a significant positive effect on leaf water content, photosynthesis and yield under both drought and well irrigated conditions. 相似文献
12.
Theodoros?MoschosEmail author C.?Souliotis T.?Broumas V.?Kapothanassi 《Phytoparasitica》2004,32(1):83-96
During 1996–1998 mating disruption trials were conducted on all three generations of the grapevine mothLobesia botrana Den. et Schiff. (Lep., Tortricidae) in a 25-ha vineyard situated at Spata, Attiki, Greece. Shortly before the beginning of
the first flight period ampoule-type pheromone dispensers were set up lining a 6.5-ha rectangular plot. Around the dispenser
zone a protection belt was created whereBacillus thuringiensis (Bt) and selective insecticides were applied against the second and third generation larvae. The protection belt was 35 m wide
and covered 3.5 ha. The rest of the vineyard was divided into the reference plot — where conventional insecticide treatments
were implemented to control both carpophagous pest generations, and the untreated control plot — which measured 1 ha. Male
catches within the dispenser zone were virtually zero. Nevertheless, no difference was apparent between the percentage of
mated females from within and outside of the dispenser zone. Attractant was released from the dispensers throughout the season
at a rather constant rate, but by the middle of the third flight period dispensers were found to be almost empty. During the
3 years of the survey pest pressure was often at exceptionally high levels. The effectiveness of the mating disruption technique
(MDT) was found to vary with year and pest generation. MDT was used against the first (anthophagous) generation with rather
poor results. In the following carpophagous generations results were comparable to control measures with insecticides used
and sometimes slightly better. The density of the pest population in the pheromone-treated vineyard as compared with the untreated
control, was reduced on average by 67% in the second and by 57% in the third generation. MDT therefore did not accomplish
sufficient crop protection.
http://www.phytoparasitica.org posting Dec. 19, 2003. 相似文献
13.
IB Lima‐Verde A Johannisson T Ntallaris E Al‐Essawe Z Al‐Kass T Nongbua F Dórea N Lundeheim K Kupisiewicz A Edman JM Morrell 《Reproduction in domestic animals》2018,53(1):127-136
Traditionally, extenders for bull semen included egg yolk or milk, but recently there has been a move to avoid material of animal origin. The aim of this study was to evaluate the effects of two commercial extenders (based on soya lecithin and liposomes) on bull sperm quality after cryopreservation. Post‐thaw sperm quality was evaluated by computer‐assisted sperm analysis and flow cytometric assessment of membrane integrity, chromatin integrity, mitochondrial membrane potential, production of reactive oxygen species and tyrosine phosphorylation. Furthermore, an artificial insemination (AI) trial was conducted, and 56‐day non‐return rates were evaluated. Semen frozen in the liposome‐based extender showed similar membrane integrity and higher mitochondrial membrane potential compared to those in the soya lecithin‐based extender. Chromatin integrity and production of live H2O2+ reactive oxygen species were similar in both extenders. Less superoxide was produced in the samples extended with liposome‐based extender, with or without menadione stimulation. Chromatin integrity and tyrosine phosphorylation were not affected by either type of extender. No differences in 56‐day non‐return rate between extenders containing soya lecithin and liposomes were observed in the AI trial (66% ± 0.8 and 65% ± 0.8, respectively). In conclusion, the sperm quality of bull semen frozen in the two extenders that do not contain material of animal origin was similar, although the semen frozen in the liposome‐based extender had higher mitochondrial membrane potential. Either extender could be used in situations where extenders containing material of animal origin are to be avoided. 相似文献
14.
Eirini Kanata Cynthia Humphreys-Panagiotidis Nektarios D Giadinis Nikolaos Papaioannou Minas Arsenakis Theodoros Sklaviadis 《Veterinary research》2014,45(1):43
The present study investigates the potential use of the scrapie-protective Q211 S146 and K222 caprine PRNP alleles as targets for selective breeding in Greek goats. Genotyping data from a high number of healthy goats with special emphasis on bucks, revealed high frequencies of these alleles, while the estimated probabilities of disease occurrence in animals carrying these alleles were low, suggesting that they can be used for selection. Greek goats represent one of the largest populations in Europe. Thus, the considerations presented here are an example of the expected effect of such a scheme on scrapie occurrence and on stakeholders. 相似文献
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Rallis TS Patsikas MN Mylonakis ME Day MJ Petanides TA Papazoglou LG Koutinas AF 《Journal of the American Animal Hospital Association》2007,43(2):122-127
An 11-year-old, male Old English sheepdog was admitted for weight loss and intermittent vomiting of 1 month's duration. A cranioventral abdominal mass, anemia, hypoproteinemia, and hypoalbuminemia were the prominent abnormal findings. Imaging studies identified a remarkably thickened gastric wall with multilobulated folds protruding into the gastric lumen. Gastrotomy revealed the presence of giant cerebriform rugal folds arising from the fundus and body of the stomach. Pronounced gastric glandular hyperplasia and lack of evidence of cellular atypia were suggestive of giant hypertrophic gastritis. The dog was treated with prednisolone, cimetidine, and hyoscine butylbromide, only to experience a short-term remission. 相似文献
17.
Yigzaw Y Gorton L Solomon T Akalu G 《Journal of agricultural and food chemistry》2004,52(5):1163-1169
Fermentation of pure teff (Eragrostis teff), pure grass-pea (Lathyrus sativus), and their mixtures, 9:1 and 8:2 (teff/grass-pea) has been done at two temperatures (room temperature and 35 degrees C) in duplicate using the strains of Lactobacillus plantarum, for bacterial fermentation, and Aspergillus oryzae and Rhizopus oligosporus in succession for solid-state fungal fermentation as inocula. In addition, the natural or spontaneous and back-slopping methods of bacterial fermentation have been done on the above four substrate groups. The pH and essential amino acid profiles of the different fermentation processes were compared. The back-slopping in teff at a temperature of 35 degrees C gave the sharpest pH drop. All fermentations done at 35 degrees C showed a steeper slope in their pH versus time plot compared to their room temperature counterpart. Fungal fermentation gave an improved amino acid profile for the essential ones in all of the substrate groups, except in pure grass-pea. Fermented teff/grass-pea (8:2) in this fungal fermentation has been found to be quite comparable in essential amino acid profile to an ideal reference protein recommended for children of 2-5 years of age. None of the bacterial fermentations produced a net change in their essential amino acid profile in any of the substrate groups investigated. Solid state fungal fermentation on pure grass-pea using the fungal strains R. oligosporous and A. oryzae in succession has shown that the neurotoxin beta-N-oxalyl-alpha,beta-diaminopropionic acid (beta-ODAP) in grass-pea has been removed by 80% on average for the high-toxin variety and by up to 97% for the low-toxin variety as determined by an improved chromatographic method with bioelectrochemical detection coupled on-line with refractive index detection. 相似文献
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Theodoros D. Stathakos Theofanis A. Gemtos Constantinos A. Tsatsarelis Stella Galanopoulou 《Soil & Tillage Research》2006,87(2):135-145
Cultivation practices permitting earlier sowing of cotton (Gossypium hirsutum L.) in Greece are required to maximize yields and facilitate harvesting. An experiment was conducted for 2 years in Central Greece to evaluate two alternative systems. The experiment was carried out in a Vertic Cambisol and a Typic Regosol field. Cultivation practices tested were: (1) conventional tillage (CT) and sowing in a flat field, (2) ridge tillage (RT), using autumn ridging and (3) sowing in a flat field under clear plastic film (PF). Early and normal sowings were compared. The effects of the treatment on the crop establishment, growth and yield, as well as on the soil physical properties, were studied. Performance evaluation of the machinery was carried out. The cost of cultivation practices was estimated. Results of soil physical properties were similar for both years. Soil water contents from sowing to plastic removal in 2000 were 14.2, 13.5 and 18.0 g/100 g and temperatures for the same period at 0.04 m depth were 17.7, 18.1 and 19.8 °C for CT, RT and PF, respectively. PF resulted in higher emergence and higher plants with smaller roots. Average yields of seed-cotton in early sowing were 4936, 4591 and 4033 kg/ha for PF, RT and CT, respectively. In late sowing, yields in RT and in CT did not differ significantly. Ridge tillage machinery saved 13.6 kWh/ha (20.9%) compared to conventional tillage machinery. The higher yields under plastic film compensated for the higher cost of the practice at the present prices of seed-cotton. 相似文献
20.
Theodoros Koutroumanidis Eleni Zafeiriou Garyfallos Arabatzis 《Forest Policy and Economics》2009,11(1):56-64
The present paper studies the existence of asymmetry in the price transmission mechanism between the producer and the consumer prices in the sector of forest products. In particular, the research is focused οn the round wood of long length (> 2 m). For the study of the asymmetry, the Johansen cointegration analysis was used while at the same time two dynamic models were estimated: The Error Correction Model (ECM Model), and the LSE?Henry general to specific model (GETS model). With the assistance of the cointegration technique, we surveyed the existence of a long-run relationship between the producers and the consumers in the Greek round wood market, while the application of the Granger causality test has shown that the consumer price Granger causes the producer price whereas the reverse is not valid. Furthermore, the application of the GETS model confirmed the existence of asymmetry in the price transmission mechanism within the round wood market. Finally, the role of imports in the determination of the producer prices is vital and is confirmed by the findings of the cointegration technique and the Granger causality test. 相似文献