42 research outputs found
The Production of Functional Sex-Reversed Male Rainbow Trout (Oncorhynchus mykiss)
No full textArslan, Tulin/0000-0001-9661-045XWOS: 000302198700010In this study, appropriate hormonal sex reversal procedure for the production of functional sex-reversed male rainbow trout (Oncorhynchus mykiss) brooders with intact sperm ducts was investigated. For this purpose, 4 groups of experiment were conducted. In oral administration group, free swimming larvae starting from the first feeding were fed 1.0-3.0 mg 17 alpha-methyltestosterone kg diets for 600 degree-days. In the remaining experimental groups, 0.5-1.0 mg l(-1) 17 alpha-methyltestosterone, 11 beta-hidroksiandrostenedione or 17 alpha-nnethyldihydrotestosterone were administered throughout the sac fry stage (370-560 degree-days post fertilization) as short (2 h) single, 48 h apart 2-3 or 1 week apart double baths. Results of the study demonstrated that appropriate androgen procedure for the production of functionally masculinized rainbow trout females should be covering the 470-800 degree-days post fertilization, but it could be periodic baths or periodic baths and oral administration of low concentrations, at low concentrations (<= 1 mg kg(-1), feed) oral administration of 17 alpha-methyltestosterone could yield high ratios of functional sex reversed males
Effects of vitamin E on growth and reproductive performance of pindani (Pseudotropheus socolofi Johnson, 1974)
No full textArslan, Tulin/0000-0001-9661-045XWOS: 000471749800009With the multibillion dollar worth global market, ornamental fish trade provides important business opportunities to aquaculturist. Pindani (Pseudotropheus socolofi) is one of the most popular freshwater fish species that is cultured for this market. However, we know little about its' nutrition and its' culture suffers from low egg and fry production numbers. Among many different nutritional components, essential vitamins, such as vitamin E, could have important impacts on reproductive performance of fishes. In this study, the effects of different dietary vitamin E levels on growth and reproductive performance of pindani were evaluated through two consecutive experiments, encompassing both juvenile and adult stages. Three different levels of alpha-tocopherol were incorporated into a commercially formulated diet at the rate of 50, 100 and 150 mg/kg. Control diet contained 121.3 mg alpha-tocopherol/kg. Elevating dietary a-tocopherol level above 121.3 mg/kg did not improve growth or feed utilization values of juvenile or adult pindani. However, reproductive performance of pindani was significantly (P 100 mg/kg provided no further improvement, but significantly reduced the relative fecundity of females. These results of the study were discussed in relation to dietary PUFA level, degree of parental care and alpha-tocopherol usage and regeneration balance. At the end, we concluded that a dietary alpha-tocopherol supplementation level of 219.3 mg/kg in a diet with 9% total lipid and 22.5-24.3% PUFA content could substantially improve the breeding performance of pindani and production efficiency of their culture.Mugla Sitki Kocman University, Mugla, TurkeyMugla Sitki Kocman University [BAP 2013/135]This study was funded by Mugla Sitki Kocman University, Mugla, Turkey (Contract # BAP 2013/135). We are also grateful to Dr. Fatih Basaran of ArtAkua Inc., Izmir, Turkey for providing all the feeds used in this study
Consumer responses to process and outcome failures in service firms
No full textThis study aims to explain the effect of consumer's value orientation on his/her dissatisfaction with service failures by applying hierarchical regression approach. Consumer responses to service failures are a function of consumer value orientation. The author identified two aspects of the universal values: face consciousness (FC) and fate submissiveness (FS). Two types of service failure were also identified as process and outcome. The findings show that the interaction effect of FC with failure type is significant although there isn't the direct effect of FC on consumers' overall dissatisfaction with service failure. The effect of FC on consumer dissatisfaction is stronger for a process failure than for an outcome failure. There is the significant moderator effect of FS on overall dissatisfaction with service failure. Consumers who are higher in FS are less dissatisfied with a service failure. Hence, the effect of FS on consumer dissatisfaction is stronger for an outcome failure than for a process failure, as opposite to FC. Consumers have different sensitivities toward the two failure types. In terms of demographic characteristics of consumer, the age and income affect to dissatisfaction with process and outcome failure. The present study enriches our understanding about both the impact of consumer value orientations and failure type on consumer's dissatisfaction. The useful implementations for researchers and practitioners are presented. © Tulin Ural, 2008
Prospects for Single- and Di-Higgs Measurements at the HL-LHC with ATLAS
No full textThe large dataset of about 3 ab that will be collected at the High Luminosity LHC (HL-LHC) will be used to measure Higgs boson processes in detail. Studies based on current analyses have been carried out to understand the expected precision and limitations of these measurements. The large dataset will also allow for better sensitivity to di-Higgs processes and the Higgs boson self coupling. This proceeding presents the prospects for Higgs and di-Higgs results with the ATLAS detector at the HL-LHC
Prospects for Single- and Di-Higgs Measurements at the HL-LHC with ATLAS
No full textThe large dataset of about 3 ab^{-1} that will be collected at the High Luminosity LHC (HL-LHC) will be used to measure Higgs boson processes in detail. Studies based on current analyses have been carried out to understand the expected precision and limitations of these measurements. The large dataset will also allow for better sensitivity to di-Higgs processes and the Higgs boson self coupling. This talk will present the prospects for Higgs and di-Higgs results with the ATLAS detector at the HL-LHC
Effects of oestradiol-17 beta or 17 alpha-methyltestosterone administration on gonadal differentiation of largemouth bass Micropterus salmoides (Lacepede)
No full textArslan, Tulin/0000-0001-9661-045XWOS: 000271626200003Monosex populations can be a valuable management tool in culture of larger size largemouth bass (> 400 g). In this study, we investigated the effective mode and duration of oestrogen and androgen administrations to produce monosex largemouth bass populations. The experiment consisted of nine treatments. In oral administration groups, we fed 40-day-old fry either 200 mg of an oestradiol-17 beta (E(2)) kg-1 diet or 60 mg of a 17 alpha-methyltestosterone (MT) kg-1 diet for 30, 45 or 60 days. In bath treatments, we immersed fry in a 1 mg MT L-1 solution for 5 h a day on three or six occasions. For control treatment, we fed fry an ethanol-treated diet for 45 days. The frequency of females in the control group was 53.1%. Oral administration of E(2) at all durations resulted in slight increases in the frequency of females (59.8-70.5%). Both modes of androgen administration at all durations were ineffective in altering phenotypic sex. The experimental results of our study indicated that male differentiation passed the point of being completely and functionally influenced by exogenous oestrogens, while female differentiation had already taken place and was no longer responsive to exogenous androgens in 40-day-old (33.5 mm) largemouth bass fry.The Higher Education Council of Turkey through a PhD grantMinistry of National Education - TurkeyDuring the study, financial support to the first author was provided by The Higher Education Council of Turkey through a PhD grant
Local aromatase activity alterations in breast cancer tissues: A potential way of decision support for clinicians
No full textBackground and aims: It is becoming evident that local estrogen exposure is important in postmenopausal breast cancer patients. The microenvironment is established by breast stromal cells based on communication with tumor cells that is essential to cancer development, invasion, and metastasis. Here we investigated aromatase activity levels in both tumor and matched stromal tissues by showing their impact on the manufacturing of local estrogen and tumor progression in cases of invasive ductal carcinoma (IDC). Methods: Tumor (T) and tumor-associated stroma (TAS) neighboring tissues were acquired from each postmenopausal patient, diagnosed with IDC, and categorized as luminal A (n = 20). The control group was formed from tumor-free breast tissue samples (N, n = 12). A microsomal-based technique was created to compare breast tissue aromatase activities using liquid chromatography - mass spectrometry. Findings: We observed that the TAS tissues have the highest aromatase activities (p < 0.05). High progesterone receptor (PR) intensity levels were found to be decreasing the activity level in these tissues significantly (p < 0.05). Tumor tissue specific aromatase activity levels of postmenopausal patients' were tend to be lower compared to healthy premenopausal subjects' (3 fold, p < 0.001). In addition low activity in tumor tissues were associated with low grade and late stage cancers. Conclusions: Early detection and personalized therapy is essential for postmenopausal breast cancer patients. Together, our in-house tandem mass spectrometry technique has the potential for further development and standardization for the measurement of aromatase activity and may assist clinicians decide on therapy policies for postmenopausal IDC patients which could be an invaluable asset for precise and specific evaluation
IMF Stabilization Programs and their Effects on the World Economic Crises
No full textAbstractThe aim of this study is that analyzing the relationship between IMF Stabilization Programs and its effect on the experienced world economic crises. The Great Depression and World War I and II faced by the world caused to be deeply shaken of the economies. Eventually, the countries were forced to create barriers against each other to protect the war-damaged economies. The world countries agreed with establishment of IMF to surpass the economic crisis. This article is concentrated on a question is that “Whether the IMF stabilization Programs effected positively or triggered into worse situation and crisis the war-damaged economies?” The examples crises are Mexican Crisis in 1994, South-eastern Asia Crisis in 1997, Russian Crisis in 1998, Argentina Crisis in 2001 and Turkey Crises in 1994, 2000 and 2001
