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Acta Veterinaria Hungarica
Authors:
Caner Öztürk
,
Şükrü Güngör
,
Mehmet Bozkurt Ataman
,
Mustafa Numan Bucak
,
Nuri Başpinar
,
Pınar Ili
, and
Muhammed Enes Inanç

The present study was conducted to examine the protective role of arginine and trehalose on post-thaw bull sperm and oxidative stress parameters. Five ejaculates for each bull were used in the study. Each ejaculate, split into three equal aliquots and diluted at 37 °C with base extenders containing 2 mM arginine, 25 mM trehalose and no antioxidant (control) was cooled to 5 °C and then frozen. Frozen straws were thawed in a water bath for evaluation. Supplementation of the semen extender with arginine decreased the percentages of post-thawed subjective motility (29 ± 8.21%), CASA motility (12.2 ± 5.69%) and progressive motility (3.52 ± 2.13%), compared with the controls (43 ± 2.73%, 55.4 ± 6.78% and 33.48 ± 4.14%, respectively, P < 0.05). Supplementation of the semen extender with trehalose produced a higher mitochondrial activity and sperm viability (36.3 ± 3.99% and 44.1 ± 2.18%) compared with the control (13 ± 8.15 and 31.7 ± 3.94%, respectively, P < 0.05). It was established that trehalose (95.1%) and arginine (92.8%) protect DNA integrity compared to the control (90.4%) (P < 0.05). Trehalose supplementation in semen extenders provided great benefit in terms of viability, mitochondrial activity, and intact sperm DNA on frozen-thawed bull sperm.

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Morchella conica Pers. strains of the study were isolated from fruit bodies collected in ash-mixed forests. At first, the strains were cultured on potato dextrose agar (PDA), then on modified Murashige and Skoog (MS*) solid agar media. A normal-growing strain was chosen for the trehalase induction experiments. During the trehalase induction treatment, mycelia were grown in liquid culture containing different concentrations of trehalose. After the induction period of trehalase enzymes, physiological state of the mycelium and the oxidative stress were monitored in the vegetative mycelia by measuring the change of the malondialdehyde content, superoxide dismutase enzyme activity, the fresh and dry weight. The examined Morchella conica strain utilized the trehalose properly. The rising amount of the trehalose triggered the increase of the mycelial trehalase enzyme activity. Our results clearly proved that both neutral and acidic trehalase isoenzyme activity of the Morchella conica mycelium are inducible and are playing important role in the utilization of external trehalose.

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Acta Veterinaria Hungarica
Authors:
Éva Váradi
,
Árpád Drobnyák
,
Barbara Végi
,
Krisztina Liptói
,
Csaba Kiss
, and
Judit Barna

The aim of the study was to find a practical and inexpensive method for freezing goose semen for use in routine inseminations under farm conditions. Two basic freezing protocols [(1) dynamic, programmable freezing and (2) static, nitrogen vapour method] were evaluated with varying concentrations of dimethylformamide (DMF) plus additional osmoprotectants such as betaine, trehalose, and sucrose, using cryovials as containers. Altogether eight different treatments were compared. sperm viability before freezing and after thawing was examined by in vitro tests and, in the case of the simplest effective method, also by in vivo fertility test. There were no significant differences in sperm survival either in the dynamic (48–50%) or in the static protocol (43–46%), except for the treatment where the lowest DMF concentration was used without any osmoprotectant in the dynamic protocol (42.6%). The addition of osmoprotectants did not improve thawed sperm viability in any case. Fertility with frozen/thawed sperm using the simplest method was 58.5%, while that obtained with fresh, diluted semen was 66.9%. The study proved that the simple freezing of gander semen in nitrogen vapour with 9% DMF in cryovials could produce acceptable fertility. The newly elaborated method can be successfully used for routine inseminations by small- and large-scale goose breeders.

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E. Calderaro 2005 Effects of gamma-irradiation on trehalose-hydroxyethylcellulose microspheres loaded with vancomycin Eur J Pharm Biopharm 59

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ornithine decarboxylase, urease activity and fermentation of seven carbohydrates: dulcitol, sorbitol, lactose, maltose, arabinose, xylose, and trehalose ( Blackall et al., 1997 ), and capsular type by a multiplex PCR ( Townsend et al., 2001 ). The isolates

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. , Baspinar , N. and Dursun , N. ( 2020 ): The synergistic effect of trehalose and low concentrations of cryoprotectants can improve post-thaw ram sperm parameters

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strain 6036 did not grow on MacConkey agar. Strain 6036 was oxidase, catalase and indole positive, but negative for ornithine decarboxylase and urea. Acid was produced from glucose, maltose and xylose, but not from trehalose, lactose, arabinose, dulcitol

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Bovine respiratory disease (BRD) is the leading cause of significant economic losses in the intensive beef industry worldwide. Beside numerous risk factors Pasteurella multocida, which is regarded as a secondary pathogen, may play a role in the development of the disease. Previous studies of strains from swine pneumonia revealed that there are a few clones associated with clinical disease, suggesting that some strains may be more virulent than others. This linkage may be true in the BRD, however composition of P. multocida populations in the herds are slightly characterized. Thus, we decided to perform phenotypic and genotypic characterisation of strains isolated from calves with respiratory infection at 31 different herds in Hungary. The results demonstrated the presence of two dominant strain types. At the identical taxonomic background (P. multocida subsp. multocida) with slight phenotypic variability they could be separated by trehalose fermentation capacity, α-glucosidase activity and molecular fingerprint patterns of ERIC- and M13-PCR. Independent prevalence and geographical origin of the strain types may refer to their significance in the illness, but their comparison with strains isolated from healthy individuals is taken into consideration.

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Acta Veterinaria Hungarica
Authors:
B. Baranyai
,
Sz. Bodó
,
A. Dinnyés
, and
Elen Gócza

Solid surface vitrification (SSV) was compared with in-straw vitrification for cryopreservation of biopsied mouse embryos. Eight-cell stage embryos were zona drilled and one blastomere was removed. Developed morulae or blastocysts were vitrified in microdrop (35% EG + 5% PVP + 0.4 M trehalose) or in straw (7.0 M EG + 0.5 M sucrose). Following recovery, embryos were cultivated in vi tro or transferred into recipients. Cryopreservation had an effect not only on the survival of biopsied embryos but also on their subsequent development in vitro. Cryosurvival of biopsied morulae vitrified in straw was significantly inferior to SSV. The post-warm development of biopsied and non-biopsied morulae was delayed on Day 3.5 and 4.5 in both vitrification groups. A delay in development was observed on Day 5.5 among vitrified non-biopsied blastocysts. The percentage of pups born from biopsied morulae or blastocysts following cryopreservation did not differ from that of the control. No significant differences could be detected between methods within and between embryonic stages in terms of birth rate. The birth rate of biopsied embryos vitrified in straw was significantly lower compared to the non-biopsied embryos. The novel cryopreservation protocol of SSV proved to be effective for cryopreservation of morula- and blastocyst-stage biopsied embryos.

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A total of 146 Pasteurella multocida strains isolated from swine in Hungary in the last 20 years were examined. Biochemical characterisation and PCR-based techniques were used to determine species, subspecies, biovar, capsule type and presence of the toxA gene. Eighty-seven percent of the isolates belonged to P. multocida ssp. multocida , and 98% of these had biovar 3 or were trehalose-or lactose-fermenting or ornithine decarboxylase negative variants of that. Ten percent of the strains were P. multocida ssp. septica , and within this group 80% of the strains showed sorbitol-negative biovars (5, 6 and 7). The rest of the strains (20%) were lactose positive. Only 3% of the porcine isolates were P. multocida ssp. gallicida and 3 out of the 4 strains belonged to the dulcitol-fermenting biovar 8. Using a capsule-specific multiplex PCR, 60% of the strains belonged to capsule type D, 38% to capsule type A, and only 1 isolate had capsule type F. In contrast with data published in the literature, only 3% of capsule type D isolates carried the toxA gene, while this ratio was 41% for the type A strains. A remarkable regional distribution of toxA gene positive strains was observed. All but two isolates were found in swine herds located in the Transdanubian region, separated from other parts of Hungary by the river Danube.

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