bluuebunny/crossref_metadata_2025_split huggingface dataset:
Antioxidative principals of Jussiaea repens: an edible medicinal plant
Authors: Huang Hai‐Lan , Li Dong‐Li , Li Xiao‐Ming , Xu Bo , Wang Bin‐Gui 
Published: November 2007

Summary Jussiaea repens L. (JRL) is an edible medicinal plant and is also used as a vegetable by the local people in southwestern China. The crude extract and its four fractions derived from JRL were evaluated for the 1,1‐diphenyl‐2‐picrylhydrazyl radical‐scavenging ability, hydroxyl radical‐scavenging capacity and the potassium ferricyanide reduction property. The ethyl acetate‐soluble fraction (EAF) and EAF6 (a subfraction derived from EAF) were the most valuable fraction and subfraction, respectively. Furthermore, bioactivity‐guided chromatographic fractionation revealed that three pure compounds greatly contributed to the antioxidant activities. Qualitative and quantitative analyses of the major antioxidant constituents in the extract were systematically conducted by NMR, mass spectral analyses and RP‐HPLC. The result demonstrated that rosmarinic acid (2.00 mg g−1 JRL dry weight) quercetin 3‐O‐β‐d‐glucopyranoside (9.88 mg g−1 JRL dry weight), and kaempferol 3‐O‐β‐d‐glucopyranoside (1.85 mg g−1 JRL dry weight) were the major antioxidative constituents in JRL. These compounds are reported for the first time from this plant.
Use of silicon oxide and sodium silicate for controlling Trichothecium roseum postharvest rot in Chinese cantaloupe (Cucumis melo L.)
Authors: Guo Yurong , Liu Lei , Zhao Jian , Bi Yang 
Published: November 2007

SummarySilicon oxide and sodium silicate were investigated as potential agents for the control of postharvest pink rot in Chinese cantaloupe (cultivar Yujingxing) caused by Trichothecium roseum. In vitro tests showed that sodium silicate, when added to potato dextrose agar, was effective in suppressing the radial growth of the pathogen on the medium, whereas silicon oxide was ineffective. The effectiveness of sodium silicate increased with concentration, and the growth of the fungus was completely inhibited at 100 mm. When melons were dipped in the solutions, both silicon oxide and sodium silicate significantly (P < 0.01) reduced the severity of pink rot of the cantaloupe with lesion diameters reduced by up to fivefold when compared with the controls. Scanning electron microscopy‐energy dispersive X‐ray analysis showed that silicon (Si)‐treated melons had a smoother surface feature and higher Si levels in the epidermis, especially at the stomata and along the junction between the exocarp and mesocarp. Enhanced peroxidase and phenylalanine ammonia lyase activities were observed in sodium‐silicate‐treated melons but not in those treated with silicon oxide. The results indicate that different mechanisms might be involved in sodium silicate and silicon‐oxide‐initiated reduction of postharvest pink rot in Chinese cantaloupe.
Use of dairy proteins in lean poultry meat batters – a comparative study
Authors: Barbut Shai , Choy Valerie 
Published: November 2007

SummaryThe use of dry whole milk, skimmed milk, caseinate, regular and modified whey, at 2% level (w/w) and with 2% additional protein level was studied in a chicken breast meat system with 51% water addition. At the 2% (w/w) level, all dairy proteins significantly reduced cooking loss compared with the control, with caseinate showing the best results. When compared on an equal protein level (2% total protein), the best performing ingredients were the whole milk and modified whey. A similar observation was made in their effect on the products’ hardness and fracturability. A cost analysis revealed that modified whey provided the most economical ingredient even when used in quantities three times greater than that of as caseinate. Microscopy results showed the formation of larger fine‐protein‐matrix regions in the treatments that provided higher fracturability values.
Viscosity of tangerine and lemon juices as a function of temperature and concentration
Authors: Magerramov Mikail A. , Abdulagatov Aziz I. , Abdulagatov Ilmutdin M. , Azizov Nazim D. 
Published: November 2007

SummaryViscosities of two fruit (lemon and tangerine) juices have been measured with a capillary flow technique. Measurements were made in the temperature range from 303 to 393 K. The range of concentration was between 15 and 40 °Brix for tangerine juice and between 17 and 45 °Brix for the lemon juice. The total uncertainty of viscosity and temperature measurements was estimated to be <0.5% at low concentrations and up to 1.5% at high concentrations and 0.025 K, respectively. The effect of temperature and concentration on viscosity of tangerine and lemon juices was study. The measured values of the viscosity were used to calculate the temperature, (∂ ln η/∂T)x, and concentration, (∂ ln η/∂x)T, coefficients for each juice. The Arrhenius type correlation equations for viscosity were used to represent the temperature dependence of viscosity. The values of the Arrhenius equation parameters (flow activation energy, Ea, and η∞) were calculated for the measured viscosities of tangerine and lemon juices as a function of concentration. Different theoretical models for the viscosity of fruit juices were stringently tested with new accurate measurements on tangerine and lemon juices. The predictive capability of the various models was studied. The concentration and temperature dependence behavior of the viscosity of tangerine and lemon juices are discussed in light of the various theoretical models for viscosity of fruit juices. The applicability and predictive capability of the models used previously for aqueous solutions to represent the effect of temperature and concentration on viscosity of fruit juices was also studied. New model was developed to represent the combined effect of temperature and concentration on the viscosity of the juices. The average absolute deviation between measured and calculated values from this correlation equation for the viscosity was 0.8% and 2.1% for tangerine and lemon juices, respectively.
Quality changes during the storage of dehydrated chicken kebab mix
Authors: Modi Vinod K. , Sachindra Nakkerike M. , Nagegowda Paregowda , Mahendrakar Namadev S. , Narasimha Rao Dittakavi 
Published: November 2007

SummaryThe level of binders (starch, refined wheat flour and milk powder) was optimised with respect to sensory quality of ready‐to‐eat kebab made from a dehydrated mix using the experiment based on the Box–Behnken design. The optimised levels (as % of cooked meat) were 4.5% starch, 9.5% refined wheat flour and 2% milk powder. Dehydrated chicken kebab mix prepared with optimised quantities of binders and spices was packed in metalised polyester pouches, stored at ambient temperature (27 ± 2 °C) for 6 months and sampled periodically for quality evaluation. A gradual decrease (P ≤ 0.05) in pH from 5.8 to 5.5, increases (P ≤ 0.05) in aw from 0.31% to 0.42%, in moisture from 5.4% to 6.2%, in free fatty acid values from 0.99 to 1.74 as per cent oleic acid and in thiobarbituric acid numbers from 2.9 to 5.3 mg malonaldehyde kg−1 were observed during storage. Hunter colour a values increased (P ≤ 0.05) from 0.30 to 1.29, whereas changes in Hunter L (51.8–53.4) and in Hunter b (19.0–19.5) values were marginal (P ≥ 0.05) during storage. The chicken kebab mix was microbiologically safe as indicated by low bacterial counts and absence of coliforms throughout the storage period of 6 months. Fried chicken kebabs prepared from mix stored for up to 6 months were acceptable.
Effect of ionic strength on inactivation kinetics of Escherichia coli O157:H7 by electron beam in ground beef, chicken breast meat, and trout fillets
Authors: Black Jennifer Lea , Jaczynski Jacek 
Published: November 2007

SummaryThe ionic strengths (IS) of ground beef, chicken meat, and trout fillets were modified to intermediate and highest with 3.5% and 7.0% NaCl, respectively. The samples with modified and unaltered (native) IS were inoculated with Escherichia coli O157:H7 and subjected to electron beam (e‐beam). The water activity (aw) of the meat samples were 1.0, 0.96–0.97, and 0.94 for native, intermediate, and highest IS. The D10‐values were calculated from survivor curves. The D10‐values for E. coli ranged from 0.19 kGy in trout (highest IS) to 0.31 kGy in beef and chicken (highest IS). Regardless of the meat type, the increased resistance of E. coli to e‐beam was only observed at the highest IS. The difference of the D10‐value for E. coli in samples at intermediate and native IS was insignificant. Regardless of the IS, the E. coli in trout was most sensitive, while the difference of E. coli resistance to e‐beam in ground beef and chicken meat was insignificant.
Evaluation of the EEC four‐plate test and Premi test for screening antibiotic residues in trout (Salmo trutta)
Authors: Kilinc Berna , Meyer Carsten , Hilge Volker 
Published: November 2007

SummaryThe four‐plate test (FPT) method was used for the determination of sulfadiazine/trimethoprim residues in trout in the European Community (EC). This microbiological inhibition test used three media seeded with Bacillus subtilis at different pH values (6, 7.2 or 8.0) and a fourth medium seeded with Micrococcus luteus. The Premi test was also used for the determination of sulfadiazine/trimethoprim residues in trout. The effects of a trout muscle supernatant on detection limits of antibiotics with microbiological inhibition tests were measured. The supernatant was applied directly on top of the paper disks impregnated with aqueous antibiotic solutions. Inhibition zones were compared with those obtained by the same standard solution of sulfadiazine/trimethoprim without the trout supernatant. The detection limit of penicillin, sulfadimidine, streptomycin groups of antibiotics were determined for checking the test plates. For supernatant from fish fed with pellets containing antibiotics (sulfadiazine/trimethoprim), the inhibition zones increased according to the duration of the feed application. In the control group, no inhibition zones were detected. The concentration of the residues accumulated and reached a plateau after 5 days. The antibiotics were detectable in the same concentration as on day 7, but three days later (on day 10) they were no longer detectable in the fish samples. In contrast to the ‘FPT’, 3 days after discontinuing the medicated diet, there were still residues detectable by ‘Premi test’ on day 10. Data is presented that shows that the FPT and the Premi test methods are very useful for the determination of sulfadiazine/trimethoprim residues in trout.
Application of a biogenic extra cellular ice nucleator for food processing: effects on the freeze‐thaw stability of fish actomyosin from tilapia
Authors: Zhu Xuntao , Lee Tung‐Ching 
Published: November 2007

SummaryThe effect of biogenic extra cellular ice nucleators (ECINs) on gel‐forming capacity and textural stability of a fish actomyosin (AM) gel system subjected to controlled freeze‐thaw (FT) cycles was studied. Stability changes were quantified by measuring the degree of retention of Ca2+ ATPase activity and changes in protein surface hydrophobicity. Results showed that different concentrations of ECIN suppressed Ca2+ ATPase activity loss during FT cycles depended quantitatively on ECIN concentration. After three FT cycles, Ca2+ ATPase activity retention was 76.20% with the highest ECIN concentration and 20.10% without ECIN, and surface hydrophobicity of AM with ECIN was 150.67, whereas the corresponding value of the control sample was 208.70. By measuring changes in surface hydrophobicity, we observed that ECIN significantly reduces denaturation of AM protein caused by FT cycling. Our data show that ECIN contributes a significant protective effect on gel‐forming capacity of fish and textural stability of fish AM during FT cycling. This demonstrates for the first time that ECINs have the potential to help stabilise the texture of fish AM and potentially other food products during frozen storage.
Rheological properties of sour‐cherry juice and concentrate
Authors: Belibağli Kadir B. , Dalgic Ali C. 
Published: November 2007

AbstractRheological properties of sour cherry juice were determined by a Controlled Stress Rheometer. Sour cherry juice with different solid contents (40, 45, 50, 55, 60, 65, 68.5 and 70 Brix) was prepared using a rotary evaporator after squeezing and filtration of sour cherries. The rheological behavior of these concentrates was studied in the temperature range of 5, 10, 20, 30, 40, and 50°C. Sour cherry juice was found to exhibit Newtonian behavior. The effect of temperature on viscosity can be described by means of an Arrhenius equation. Activation energies appeared in the range of 22.44–73.49 kJ/mol with increasing concentration. To study effect of concentration on the viscosity, power‐law and exponential equations were used. Finally, two equation describing the combined effect of temperature and soluble solids content on the viscosity of concentrated sour cherry juice were obtained.
The construction of men who are nurses as gay
Authors: Harding Thomas 
Published: November 2007

AbstractTitle. The construction of men who are nurses as gayAim. This paper is a report of a study to examine the construction of the stereotype of male nurses as gay, and to describe how this discourse impacts on a group of New Zealand male nurses.Background. A discourse stereotyping male nurses as gay is accompanied by one which privileges hegemonic masculinity and marginalizes homosexuality.Method. This social constructionist study drew on data collected from existing texts on men, nursing and masculinity and interviews with 18 New Zealand men conducted in 2003–2004. Discourse analysis, informed by masculinity theory and queer theory, was used to analyse the data.Findings. Despite the participants’ beliefs that the majority of male nurses are heterosexual, the stereotype persists. A paradox emerged between the ‘homosexual’ general nurse and the ‘heterosexual’ psychiatric nurse. The stigma associated with homosexuality exposes male nurses to homophobia in the workplace. The heterosexual men employed strategies to avoid the presumption of homosexuality; these included: avoiding contact with gay colleagues and overt expression of their heterosexuality.Conclusion. There is a paradox between widespread calls for men to participate more in caring and discourses which stereotype male nurses as gay and conflate homosexuality and sexual predation. These stigmatizing discourses create a barrier to caring and, aligned with the presence of homophobia in the workplace, deter men’s entry into the profession and may be important issues with respect to their retention. Nurse educators must ensure that nurses are able to resist collusion with stigmatizing discourses that marginalize men (and women) in the profession through the perpetration of gender and sexual stereotypes.
Sexual size dimorphism predicts the frequency of multiple mating in the sex‐role reversed pipefish Syngnathus typhle
Authors: RISPOLI V. F. , WILSON A. B. 
Published: November 2007

AbstractThe sex‐role reversed pipefish Syngnathus typhle is a member of the Syngnathidae, a family of fishes in which males brood embryos on their body surface. As in most ectotherms, embryonic development is highly temperature dependent in syngnathids and male brooding periods are extended when water temperatures are reduced. The influence of temperature on reproduction is expected to effectively truncate the breeding season and reduce fecundity in cold waters, potentially enhancing the opportunity for both fecundity and sexual selection. We studied spatial variation in the morphology and reproductive biology of S. typhle in five European populations which vary in latitude and water temperature. Microsatellite analyses indicated that the average number of male mates per population ranged between 1.3 and 3.7. The frequency of multiple mating by males was negatively correlated with the degree of sexual size dimorphism in each population, suggesting that disproportionate increases in female fecundity may be able to compensate for increased male brood pouch capacity. Both sexes were larger and males had an increased brood size where water temperatures during the breeding season were lower. Morphological variation among populations may be mediated by differences in fecundity selection associated with different optimal reproductive strategies in cold and warm water environments.
The implicit assumption of symmetry and the species abundance distribution
Authors: Alonso David , Ostling Annette , Etienne Rampal S. 
Published: November 2007

AbstractSpecies abundance distributions (SADs) have played a historical role in the development of community ecology. They summarize information about the number and the relative abundance of the species encountered in a sample from a given community. For years ecologists have developed theory to characterize species abundance patterns, and the study of these patterns has received special attention in recent years. In particular, ecologists have developed statistical sampling theories to predict the SAD expected in a sample taken from a region. Here, we emphasize an important limitation of all current sampling theories: they ignore species identity. We present an alternative formulation of statistical sampling theory that incorporates species asymmetries in sampling and dynamics, and relate, in a general way, the community‐level SAD to the distribution of population abundances of the species integrating the community. We illustrate the theory on a stochastic community model that can accommodate species asymmetry. Finally, we discuss the potentially important role of species asymmetries in shaping recently observed multi‐humped SADs and in comparisons of the relative success of niche and neutral theories at predicting SADs.
Brain Drain Potential in Botswana
Authors: Campbell Eugene K. 
Published: November 2007

ABSTRACTThis paper examines the prospect of emigration of skilled professional citizens from Botswana. Since 1980, international migration of skilled people from, and within, sub‐Saharan Africa (SSA) has surpassed anything previously witnessed in the twentieth century. One consequence of the increasing frequency of such migration is growing governmental resistance in developed countries to free movement of skilled labour. Unlike most SSA countries, Botswana's robust economy and long‐standing democratic political structure make it appear an unlikely candidate for massive brain drain, but there are already indicators pointing towards its occurrence (Campbell, 2001). This study was designed primarily to determine whether professionals persist in their intention to leave the country and, if so, why they want to migrate.The results point towards a likelihood of massive brain drain in Botswana in the near future, although the prospects of this being realized cannot be ascertained by the instruments employed in this study. Among the key findings are that: 1) the unhappiness of future professionals seems to derive from poor opportunities for professional advancement resulting in disequilibrium between income distribution and a taste for luxury goods; 2) the prospects for emigration have improved because of increased earnings and but better access to information technology, and; 3) that technology may now be a more important motivation for emigration than family members living abroad. Nonetheless, there is evidence that a vigorous and sustained economy‐enhancing campaign by the government would encourage Batswana professionals to stay and work in the country.
Predictors of clutch predation of a globally significant avifauna in New Zealand's braided river ecosystems
Authors: Norbury G. , Heyward R. 
Published: November 2007

AbstractPredation by introduced mammals is decimating New Zealand's indigenous fauna. Understanding factors that influence this process allows resources for predator control to be applied with maximum effect. This study examines how predation of a secondary prey species (a relatively common but declining native plover, the banded dotterel Charadrius bicinctus) varied with reductions in abundance of a major prey source (rabbits), kill‐trapping of predators, nest density and habitat complexity. Banded dotterels mostly nest in open braided riverbeds alongside a number of endemic threatened species. We measured the fate of 753 dotterel clutches exposed to predation by cats, ferrets and hedgehogs. We found key times and places of high predation risk. Immediately after widespread reduction in rabbit populations by rabbit haemorrhagic disease (RHD), clutch predation rates were almost as high (mean, 50%) as those recorded during past rabbit poisoning programmes (mean, 57%). Both rates were significantly higher than the mean predation rate of 22% without rabbit control, suggesting a shift in predator diet immediately after rabbit population declines. Unlike after rabbit poisoning, clutch predation rate remained high in the years after RHD. Other patterns observed included higher clutch predation rate where nest density was lower, suggesting that predation can potentially cause local extinction. Clutch predation was also higher along riverbed margins where vegetation was dense. There was equivocal evidence for an effect of predator kill‐trapping on clutch predation rate. Management strategies that could potentially reduce clutch predation risks include focusing predator mitigation measures during periods of rabbit decline, maintaining them for more than one breeding season if the rabbit declines are widespread (e.g. RHD epidemics), and applying greater effort at sites with relatively low nest density and along riverbed margins where predator use is more frequent.
The distribution of nuclear genetic variation and historical demography of sea otters
Authors: Aguilar A. , Jessup D. A. , Estes J. , Garza J. C. 
Published: November 2007

AbstractThe amount and distribution of population genetic variation is crucial information for the design of effective conservation strategies for endangered species and can also be used to provide inference about demographic processes and patterns of migration. Here, we describe variation at a large number of nuclear genes in sea otters Enhydra lutris ssp. We surveyed 14 variable microsatellite loci and two genes of the major histocompatibility complex (MHC) in up to 350 California sea otters Enhydra lutris nereis, which represents ∼10% of the subspecies' population, and 46 otters from two Alaskan sites. We utilized methods for detecting past reductions in effective population size to examine the effects of near extinction from the fur trade. Summary statistic tests largely failed to find a signal of a recent population size reduction (within the past 200 years), but a Bayesian method found a signal of a strong reduction over a longer time scale (up to 500 years ago). These results indicate that the reduction in size began long enough ago that much genetic variation was lost before the 19th century fur trade. A comparison of geographic distance and pairwise relatedness for individual otters found no evidence of kin‐based spatial clustering for either gender. This indicates that there is no population structure, due to extended family groups, within the California population. A survey of population genetic variation found that two of the MHC genes, DQB and DRB, had two alleles present and one of the genes, DRA, was monomorphic in otters. This contrasts with other mammals, where they are often the most variable coding genes known. Genetic variation in the sea otter is among the lowest observed for a mammal and raises concerns about the long‐term viability of the species, particularly in the face of future environmental changes.