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Molecular Detection of Aflatoxin Producing Strains of Aspergillus Flavus from Peanut (Arachis Hypogaea) Texte intégral
2015
Adeela Hussain | Awais Afzal | Muhammad Irfan | Kauser Abdulla Malik
Aflatoxins are the potential carcinogens produced as secondary metabolites by Aspergillus flavus. They have the ability to contaminate large number of food which ultimately affect the human population. Malt extract agar was selected for the growth of control stains of fungus. The aim of the study was to develop a reliable and quick method for the detection of aflatoxin producing strains in peanuts by using molecular approaches. Total 80 samples of infected peanuts were collected from four different cities of Punjab and checked for their aflatoxin contamination. For aflatoxin detection, three target genes nor1, ver1 and aflR were selected which was involved in the aflatoxin biosynthesis. In all examined cases, 24 out of 80 (30%) samples successfully amplified all three genes indicating aflatoxigenic activity. Discrimination between aflatoxigenic and non-aflatoxigenic strains were also determined on the basis of amplification of these three target DNA fragments. In this study, it was also demonstrated that only specific strains were able to produce the aflatoxin contamination in peanuts.
Afficher plus [+] Moins [-]A New Approach to Determine Time and Temperature Combination for Electrical Conductivity Test in Sorghum Texte intégral
2015
Mehmet Demir Kaya | Onur İleri
This study was conducted to determine a suitable time and temperature combination for the electrical conductivity test to be used in sorghum seeds. Fifty seeds known initial seed moisture content and weight of fresh and dead seeds (105°C for 6h) of seven sorghum cultivars were used as material. The electrical conductivities of soaking water were measured using an EC meter in 20, 25 and 30°C for 4, 8, 12 and 24 h using 50 mL deionized water. The experimental design was three factor factorial (7 × 3 × 4) arranged in a completely randomized design; with four replications and 50 seeds per replicate. The results showed that increased time and temperature caused a remarkable increase in EC values of all of the cultivars. Temperature significantly affected the electrical conductivity values and the best results were obtained at 25°C. The cultivars with the lower germination percentage gave the higher electrical conductivity value. Dead seeds always gave higher electrical conductivity at 25°C for all periods. It was concluded that the temperature of 25°C and 24 h was the optimum combination for the electrical conductivity test in sorghum.
Afficher plus [+] Moins [-]Biopreservative in Foods: Nisin (E234) Texte intégral
2015
Başar Uymaz | Pınar Şanlıbaba
Fermentation is the oldest traditional method in order to protect against spoilage and pathogenic microorganisms. Thermal treatment, pH and water activity lowering and preservative addition other food preservation techniques that are commonly used. Although, as preservatives, many improved antibiotic and chemical agents have been gained, there are some other factors such as rapid resistance to antibiotics used in bacteria, in order to limit their use in food, to be found dimensions of threatening human health of the chemical protection and to cause allergic reactions. Recently, studies on bacteriocins that are produced by the safe bacteria, such as lactic acid bacteria, contain no toxic and adverse effects for human consumption have gained sudden intensity in accordance with the request against consumers in developing microbiologically safe and minimal processed food. There are some important effects using of bacteriocins accepted the new generation of antimicrobial agents as food preservatives such as extension of shelf life, reducing of the use of chemical preservatives and the economic loss caused degradation by microorganisms. Nisin, defined as GRAS (Generally Recognized as Safe) by FDA and named the E234 code 'Nisin-protective' or 'natural protective' located in the food additives list, first used in 1988 as a natural preservative by prohibiting of antibiotics using in food in the US. Nowadays in more than 50 countries, there have been more successful implementation of the nisin protected up the food from milk and dairy products to canned foods many food products
Afficher plus [+] Moins [-]The Current State of Production and Future Estimation of Dry Beans Production in Turkey Texte intégral
2015
Mehmet Aydoğan | Kürşat Demiryürek | Nur İlkay Abacı
This study was conducted to reveal of future estimation of the dry bean production area, production quantity, export quantity, import quantity and supply-demand balance in Turkey. The data used in the study were obtained from the Turkish Statistical Institute (TIS), FAO and the Ministry of Food Agriculture and Livestock records. The Double exponential smoothing method was used to estimate the future data. The data was used in the analysis includes dry bean production areas (ha), quantity of production, export, import and domestic use between 1994 and 2014. In the next five years (2015-2019), it was forecasted that there would be a decrease in the amount of the dry bean production areas, production quantity and export quantity whereas there would be an increase in the amount of the dry bean import quantity and domestic use. At the same time, it was expected that the amount of dry bean domestic supply would be higher than dry bean domestic demand. The reason for this surplus is high import quantity. In other words, it was foreseen that Turkey’s external dependence in dry bean will increase. In order to ensure continuity of production, it should be increase the income of dry bean producers, decrease the dry bean production cost and encourage the production. The policies to prevent domestic prices fall should be developed.
Afficher plus [+] Moins [-]Effect of Anionic Salt Supplementation on Metabolic Profile, Peripartum Diseases and Pregnancy Rate of Dairy Cows During the Prepartum Period Texte intégral
2015
Mahmut Çinar | Ugur Serbester | Ayhan Ceyhan
The aim of the present work was to examine the effects of anionic salts (MgCl2 or MgSO4) supplementation on metabolic profile, peripartum diseases and pregnancy rate of dairy cows during the prepartum period. Fourty five Holstein dairy cows were placed on 1 of 3 prepartum treatments. Treatment groups were balanced body condition score as far as similar. Treatments were total mixed ration (TMR) without anionic salt (control), TMR supplemented with 30 g/d/cow MgCl2 or TMR supplemented with 30 g/d/cow MgSO4. After parturation, all groups were fed with same TMR. The presynch-ovsynch protocol was used and fixed time artificial insemination was done after 30 days postpartum. The experiment was lasted for 8 weeks of postpartum. Cows fed MgCl2 supplemented TMR increased milk yield compared with control and MgSO4 supplemented TMR. Supplementing anionic salts reduced serum AST and ALT concentrations, increased serum glucose, HDL, IgG, Ca and Mg concentrations. Health and reproductive performance were not different between treatments. These data suggets that anionic salts supplementation in TMR during prepartum can alter milk yield and blood biochemical parameters.
Afficher plus [+] Moins [-]The Abundance and Distribution of Some Teleost Fishes’ Eggs and Larvae in Izmir Bay between the years 2011-2013 Texte intégral
2015
Burcu Taylan | Belgin Hoşsucu
In this study, the samples were collected seasonally from 9 stations vertically by 57 cm diameter with 200 micron mesh size between 2011-2013. We obtained 23570 eggs/m2, 107 prelarvae/m2 and 8605 larvae/m2 identified 30 species belonging to 19 families. The eggs and larvae of the species Engraulis encrasicolus (21624 eggs/m2, 7169 larvae/m2) were found to be dominant in Izmir Bay. Maximum species diversity were detected in the spring (17 species) and summer (19 species).
Afficher plus [+] Moins [-]Growth Performance and Feed Utilization of Russian Sturgeon Acipenser gueldenstaedtii Brandt&Ratzeburg, 1833 in Grow-out Phase Cultured in the Black Sea Texte intégral
2015
Mehmet Kocabaş | Nadir Başçınar | Şebnem Atasaral Şahin | Ramazan Serezli
The aim of present study was to determine the growth performance of Russian sturgeon Acipenser gueldenstaedtii throughout 5 years and to investigate problems encountered in grow-out phase. Fish samples (2750.88±351.18 g, 80.18±6.49 cm mean±SD) were equally stocked into fiberglass tanks, three replicate per treatment and fed for 5 years. Gain of weight and length, Specific Growth Rate (SGR), Condition Factor (CF) and Feed Conversion Ratio (FCR) were determined. Our results indicated that mean final length and weight were 106.34±2.79 (cm) and 6651.16±3.16 (g). The mean condition factor (CF) at year 5 was 0.51. FCR values fluctuated and the highest value of food conversion rate (FCR) was determined in 4th year. During the rearing period of Russian sturgeon, SGR values decreased dramatically from 2.88 to 1.83. In conclusion, slow growth was determined in Russian sturgeon A. gueldenstaedtii. Therefore, there is need for extensive evaluation and comparison of data obtained from field studies and those obtained from laboratory studies.
Afficher plus [+] Moins [-]Effects of Additive Feeding with Pollen and Water on Some Characteristics of Honeybee Colonies and Pine Honey Production Texte intégral
2015
Halil Yeninar | Ethem Akyol | Alaeddin Yörük
This study was carried out to determine the effects of additive feeding with pollen and water on honey yield, colony population, winter loses and wintering ability of colonies in pine honey production season in Muğla province of Turkey. Total twenty honeybee colonies had similar physiological pattern (queen age, genotype, amount of adult worker bees (number of frames covered with adult worker bees), sealed brood areas (cm2) and food stocks) were used and randomly divided into four groups. Three of them were fed extra with pollen+water, pollen and water. The control colonies were not given additive foods. Honey yield in pollen+water, pollen, water and control groups were found to be 24.2±1.1, 17.3±0.8, 16.3±1.0 and 12.0±0.6 kg/colony respectively. Group means were statistically significant. From September 25 to February 15 (wintering), losses of the adult worker bees in pollen+water, pollen, water and control groups were 50%, 69%, 68% and 82%, decrease of sealed brood areas in the groups were 48%, 66%, 68% and 85%, respectively. Wintering ability of pollen+water, pollen, water and control groups were found to be 92.1±3.2, 70.4±17.8, 67.1±16.7 and 51.0±21.2% respectively. The results showed that additive feeding in pine honey production season, especially feeding with both pollen+water provided nearly 100% more honey production and 80% better wintering ability than the control group. In addition, feeding with only pollen or water had similar positive effect (approximately 40%) better than control group
Afficher plus [+] Moins [-]Determining The Effect of Some Mechanical Properties on Color Maturity of Tomato With K-Star, Random Forest and Decision Tree (C4.5) Classification Algorithms Texte intégral
2015
Hande Küçükönder | Kubilay Kazım Vursavuş | Fatih Üçkardeş
This study was conducted in order to determine the effect of the mechanical properties such as maximum force at the skin rupture point, energy at the skin rupture point and the skin firmness on color maturity of tomato by supervised learning algorithms of data mining. In the present study, a total of 88 tomato samples were used, and color measurements for each tomato in 4 different equatorial regions were performed and a total of 352 color measurement units were used. In the classification processes performed according to these mechanical properties, K-Star, Random Forest and Decision Tree (C4.5) algorithms of data mining were utilized, and in the comparison of comprising classification models, Root Mean Square Error (RMSE), Mean absolute error (MAE), Root relative squared error (RRSE) and Relative absolute error (RAE) values, which are some of the criteria of error variance, were considered to be low, while the classification accuracy rate was considered to be high. As a result of the comparison made, the classification model formed according to K-Star instance-based algorithm [MAE: 0.004, RMSE: 0.006, %RAE: 1.73, %RRSE: 1.70] has been found to be a better classifier compared to the others. With the classification made according to K-Star algorithm, the maximum force at the skin rupture point on the degree of maturity of tomato and the skin firmness were found to be green, light red, and their effects are non-significant during the color conversion periods, and found significant during other periods while the energy at the skin rupture point is only pink and has been to be significant during the color conversion stages and non-significant during other stages.
Afficher plus [+] Moins [-]Evaluation of Different Groundnut Arachis hypogea L. Cultivars Against Termites, Odontotermes obesus (Rambur) in Rawalpindi, Pakistan Texte intégral
2015
Muhammad Usman Malik | Humayun Javed | Mahmood Ayyaz
Six groundnut (Arachis hypogea L.) cultivars i.e. Golden, BARI-2000, Australian, BARD-479, ICG-7326 and 2KCGC20 were evaluated against the attack of Odontotermes obesus in terms of percentage infestation of workers and soldiers, their damage and impact on the yield. The maximum mean populations of O. obesus workers were recorded on 2KCGC20 (30.82±2.75 workers/plot) and Australian (30.65±2.92 workers/plot), followed by BARI 2000 (19.55±2.51 workers/plot), Golden (17.30±2.27 workers/plot) and BARD-479 (16.82±2.06 workers/plot). The minimum mean population of O. obesus workers was found on ICG-7326 cultivars (14.85±1.81) workers/plot. The maximum mean population infestation of O. obesus soldiers was recorded on 2KCGC20 cultivar (4.88±0.25 soldiers/plot) followed by Australian (4.15±.30, soldiers/per plot), BARD-479 (2.00±.17 soldiers/plot), ICG-7326 (1.70±.14 soldiers/plot), BARD 2000 (2.40±.25 soldiers/ plot). The minimum mean population of O. obesus soldiers was found on Gold (1.87±.17 soldiers/plot). Population of O. obesus workers was positively related with the damage and negatively related the yield in all the groundnut cultivars.
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