bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Transcription Factor ABI4 Is Required for the Ascorbic Acid–Dependent Regulation of Growth and Regulation of Jasmonate-Dependent Defense Signaling Pathways inArabidopsis
Authors: Kerchev Pavel I. , Pellny Till K. , Vivancos Pedro Diaz , Kiddle Guy , Hedden Peter , Driscoll Simon , Vanacker Hélène , Verrier Paul , Hancock Robert D. , Foyer Christine H. 
Published: September 2011

AbstractCellular redox homeostasis is a hub for signal integration. Interactions between redox metabolism and the ABSCISIC ACID-INSENSITIVE-4 (ABI4) transcription factor were characterized in the Arabidopsis thaliana vitamin c defective1 (vtc1) and vtc2 mutants, which are defective in ascorbic acid synthesis and show a slow growth phenotype together with enhanced abscisic acid (ABA) levels relative to the wild type (Columbia-0). The 75% decrease in the leaf ascorbate pool in the vtc2 mutants was not sufficient to adversely affect GA metabolism. The transcriptome signatures of the abi4, vtc1, and vtc2 mutants showed significant overlap, with a large number of transcription factors or signaling components similarly repressed or induced. Moreover, lincomycin-dependent changes in LIGHT HARVESTING CHLOROPHYLL A/B BINDING PROTEIN 1.1 expression were comparable in these mutants, suggesting overlapping participation in chloroplast to nucleus signaling. The slow growth phenotype of vtc2 was absent in the abi4 vtc2 double mutant, as was the sugar-insensitive phenotype of the abi4 mutant. Octadecanoid derivative-responsive AP2/ERF-domain transcription factor 47 (ORA47) and AP3 (an ABI5 binding factor) transcripts were enhanced in vtc2 but repressed in abi4 vtc2, suggesting that ABI4 and ascorbate modulate growth and defense gene expression through jasmonate signaling. We conclude that low ascorbate triggers ABA- and jasmonate-dependent signaling pathways that together regulate growth through ABI4. Moreover, cellular redox homeostasis exerts a strong influence on sugar-dependent growth regulation.
Study of external air flow for an AURORA
Authors: Ribeiro Alves , Mantha Vishveshwar R. , Rouboa Abel I. , Marinho Daniel A. , Silva António J. 
Published: September 2011

PurposeThe purpose of this current study is to identify the optimal stable position of airship, with reference to spatial variation of atmospheric wind flow, so as to reduce the vibrations and thus aid in the development of control mechanism of airship dynamics.Design/methodology/approachStudy of uniform flow under steady‐state conditions was carried out through the measurements of pressure and velocity in a wind tunnel at low Mach numbers on airship model (in order of size, 1:13) inclined to the uniform air stream at various angles. The measurements have been made for a range of angles of incidence, in both vertical and horizontal planes, with a Reynolds number, based on the free stream velocity and a body cross‐sectional dimension, of order of four and six, respectively. Steady‐state numerical simulations were performed, serving comparative investigation with experimental data for the specific case of the model inclined to the free stream, with orientation of side‐slip (yaw) angle β=0 and angle of attack (pitch) α=0.FindingsThe numerical results showed similar trend as found by experimental analysis. In this study, several factors such as the pressure (Cp), lift (CL), drag (CD) coefficients, pressure and air velocity were taken into account for comparative analysis. The analysis paved the way in identification of constructively stable position of airship model with orientation of β=0 and α=0, with respect to air flow direction.Practical implicationsThe current findings aid in the development of control mechanism of airship dynamics.Originality/valueThe experimental analysis of the airship model is presented along with computational fluid dynamics analysis of optimised shape of airship model in different orientations with respect to direction of airflow.
Effective fault diagnosis based on strong tracking UKF
Authors: Han Pengxin , Mu Rongjun , Cui Naigang 
Published: September 2011

PurposeThe purpose of this paper is to address the flaws of traditional methods and fulfil the special fault‐tolerant re‐entry navigation requirements of reusable boost vehicle (RBV).Design/methodology/approachA kind of improved estimation method based on strong tracking unscented Kalman filter (STUKF) is put forward. According to the fact that the traditional state χ2‐test‐based fault diagnosis method is incompetent to detect the signal point small jerks and slowly varying fault in the measurement, a kind of original fault diagnosis technology based on STUKF is used to check the working states of navigation sensors.FindingsThe comparisons with χ2‐test method under typical failure distributions validate the perfect state tracking and fault diagnosis performances of this improved method.Practical implicationsThis kind of state estimation and fault diagnosis method could be used in the navigation and guidance systems for many kinds of aeronautical and astronautical vehicles.Originality/valueA kind of novel strong tracking state estimation filter is used, and a kind of very effective fault diagnosis criterion is put forward for the navigation of RBV.
Neural network based feedback error controller for helicopter
Authors: Vijaya Kumar M. , Sampath P. , Suresh S. , Omkar S.N. , Ganguli Ranjan 
Published: September 2011

PurposeThis paper seeks to present a feedback error learning neuro‐controller for an unstable research helicopter.Design/methodology/approachThree neural‐aided flight controllers are designed to satisfy the ADS‐33 handling qualities specifications in pitch, roll and yaw axes. The proposed controller scheme is based on feedback error learning strategy in which the outer loop neural controller enhances the inner loop conventional controller by compensating for unknown non‐linearity and parameter uncertainties. The basic building block of the neuro‐controller is a nonlinear auto regressive exogenous (NARX) input neural network. For each neural controller, the parameter update rule is derived using Lyapunov‐like synthesis. An offline finite time training is used to provide asymptotic stability and on‐line learning strategy is employed to handle parameter uncertainty and nonlinearity.FindingsThe theoretical results are validated using simulation studies based on a nonlinear six degree‐of‐freedom helicopter undergoing an agile maneuver. The neural controller performs well in disturbance rejection is the presence of gust and sensor noise.Practical implicationsThe neuro‐control approach presented in this paper is well suited to unmanned and small‐scale helicopters.Originality/valueThe study shows that the neuro‐controller meets the requirements of ADS‐33 handling qualities specifications of a helicopter.
On the probability of collision for crossing aircraft
Authors: Campos L.M.B.C. , Marques J.M.G. 
Published: September 2011

PurposeThe purpose of this paper is to calculate the probability of collision of flying aircraft crossing on straight paths in any direction.Design/methodology/approachThe probability of deviations from the intended flight paths is used to calculate the probability of collision that is integrated over time to cover whole events.FindingsThe probabilities of collision are calculated in terms of the r.m.s. position errors and encounter geometry, that is aircraft velocities and flight path angles and crossing angles.Research limitations/implicationsThe method does not apply to aircraft flying in parallel tracks at the same velocity in air corridors: that case has been covered elsewhere, as well as the case of climbing or descending aircraft.Practical implicationsInternational Civil Aviation Organization (ICAO) specifies as target level of safety (TLS) a probability of collision not exceeding 5×10−9per hour. To meet the ICAO TLS standard, it is necessary to calculate collision probabilities for all stages of flight.Social implicationsA low collision probability is a safety metric; the value does depend on a realist choice of probability distribution.Originality/valueCalculates the probability of collision for crossing flights, corresponding to a common scenario on air traffic management.
Hierarchical mission planning for multiple vehicles airdrop operation
Authors: Wei Tietao , Qu Xiangju , Wang Liuping 
Published: September 2011

PurposeAirdrop operation has become an important transportation mode due to its mobility and rapidity and mission planning is one of the critical steps in the preparation of an airdrop operation. The purpose of this paper is to propose an efficient mission planning method for airdrop operation using multiple vehicles.Design/methodology/approachA hierarchical mission planning method is proposed. According to the objectives of the action, the mission planning is divided into three planning levels to form the hierarchical structure and the constraints are distributed among them. By doing so, the proposed approach converts the original mission planning problem to a constrained optimization problem, which is solvable using existing mathematical methods.FindingsOn the basis of analysis, the mathematic models of three planning levels are established. Each level has its own optimization objective, taking part of constraints into account. The integrated mission scheme had been obtained step by step.Practical implicationsThis paper systematically tackles the complicated multiple vehicles airdrop mission planning problem, and it provides a platform for optimizing the outcomes. The mathematical models established in this paper could apply in a variety of more complex mission scenarios.Originality/valueThis paper fulfils an urgent need to study how the advantages of airdrop operation can be maximized through planning airdrop mission schemes carefully.
Flight demonstrations of micro‐actuator controlled delta wing
Authors: Lee John , Newbern Scott , Tai Yu‐Chong , Ho Chih‐Ming , Adam Huang Po‐Hao 
Published: September 2011

PurposeThe goal of this research is to demonstrate micro‐electro‐mechanical systems (MEMS)‐based transducers for aircraft maneuvering. Research in wind tunnels have shown that micro‐actuators can be used to manipulate leading edge vortices found on aerodynamic surfaces with moderate to highly swept leading edges, such as a delta wing. This has been labeled as the MEMS vortex shift control (MEMS‐VSC). The work presented in this paper seeks to detail the evolution of real‐world flight tests of this research using remotely piloted vehicles (RPVs).Design/methodology/approachFour different RPVs were constructed and used for flight tests to demonstrate the ability of using MEMS devices to provide flight control, primarily in the rolling axis.FindingsMEMS devices for high angle‐of‐attack (AOA) turning flights have been demonstrated and the paper finds that the success of a complex project like the MEMS‐VSC requires the marriage of basic science expertise found in academia and the technical expertise found in industry.Research limitations/implicationsOwing to the need to test fly the RPVs at low altitudes for video documentation while performing high AOA maneuvers, the attrition of the RPVs becomes the dominant factor to the pace of research.Practical implicationsMEMS sensors and actuators can be used to augment flight control at high AOA, where conventional control surfaces typically experiences reduced effectiveness. Separately, the lessons learned from the integration efforts of this research provide a potentially near parallel case study to the development of ornithopter‐based micro aerial vehicles.Originality/valueThis is the only research‐to‐date involving the demonstration of the MEMS‐VSC on real‐world flight vehicles.
The chemical composition of some garden Dahlia tubers
Authors: Nsabimana Consolate , Jiang Bo 
Published: September 2011

PurposeDahlia is an ornamental plant originating from Mexico where it is considered as the National flower. The purpose of this paper is to investigate tubers from yellow, white and red‐flowered cultivars of the common garden Dahlia (D. pinnata) for their chemical composition.Design/methodology/approachThe composition of minerals was determined using Atomic Absorption Spectrometry (AAS), whereas vitamins were analyzed by High‐Performance Liquid Chromatography (HPLC).FindingsCarbohydrates represented the major constituent in Dahlia tubers, followed by fibre and protein. Tubers of the yellow‐flowered cultivar “HGH” contained the highest amount of carbohydrates, while tubers of the white‐flowered cultivar “BJ” and those of the red‐flowered cultivar “XM” abounded in fibre and protein, respectively. In addition, Dahlia tubers exhibited varying concentrations of minerals, among which potassium, calcium, magnesium, phosphorus, zinc and chromium were predominant. Tubers of the white‐flowered cultivar “LB” contained the highest amounts of magnesium and phosphorus. Moreover, tubers of the red‐flowered cultivar “MLH” showed the highest contents of potassium and chromium, whereas those of the red‐flowered cultivar “XM” were rich in calcium and zinc. Furthermore, Dahlia tubers were found to contain water and fat soluble vitamins, among which vitamins B2, B6, B7 and E were the most abundant. Tubers of the white‐flowered cultivar “BJ” exhibited the highest contents of water soluble vitamins, whereas those of the white‐flowered cultivar “LB” abounded in fat soluble vitamins.Originality/valueDespite the considerable variability observed among cultivars, Dahlia might be utilized as an alternative food resource for human nutrition.
The content of L‐carnitine in meat after different methods of heat treatment
Authors: Knüttel‐Gustavsen Seline , Harmeyer Johein 
Published: September 2011

PurposeThe objective of this study is to examine the effects of pan‐frying, boiling and cooking in a microwave on the amount of L‐carnitine in meat and to look at its distribution in the surrounding fluid after food processing.Design/methodology/approachTotal carnitine, free carnitine and acylcarnitines were determined in meat samples from beef, pork and poultry (including ostrich) and in a liver sample from beef. The measurements were carried out before and after the specimens were subjected to different heat treatments. A radio‐enzymatic assay was used for measurement of L‐carnitine. Results are expressed per 100 gram dry matter and per 100 gram wet weight.FindingsExcept for pan‐frying, virtually no losses of carnitine occurred during the different procedures of heat treatment. During boiling and microwaving, however, a considerable portion of the tissue carnitine escaped into the water fraction. With pan‐frying, carnitine losses from meat amounted to from 3 to 36 per cent. In all animal species, tissue losses of L‐carnitine increased with increase of boiling time. When expressed as a percentage of total carnitine, the proportion of carnitine present as esters differed somewhat between different heating procedures but showed no typical pattern.Originality/valueThe findings of this study show the important role that meat products play for providing an adequate amount of L‐carnitine in humans who are suffering from carnitine deficiency and an exogenous supplementation is needed.
ACE inhibitory activity and bioconversion of isoflavones by Lactobacillus in soymilk supplemented with B‐vitamins
Authors: Ewe Joo‐Ann , Wan‐Abdullah Wan‐Nadiah , Karim Alias Abdul , Bhat Rajeev , Liong Min‐Tze 
Published: September 2011

PurposeThe aim of this study is to examine the bioactive properties of lactobacilli‐fermented B‐vitamin soymilk, namely the in‐vitro antihypertensive property and bioconversion of isoflavone glucosides to aglycones.Design/methodology/approachLactobacillus acidophilus BT 1088, L. fermentum BT 8219, L. acidophilus FTDC 8633 and L. gasseri FTDC 8131 were investigated for their bioactive potential and enhanced bioconversion of isoflavones in soymilk supplemented with individual B‐vitamins at a concentration of 1 mg/L.FindingsThe supplementation of thiamine, riboflavin, niacinamide, calcium pantothenate, biotin and folic acid enhanced the ACE‐inhibitory activity of lactobacilli in soymilk accompanied by a lower IC50 value compared to the control (P<0.05). The β‐glucosidase specific activity of lactobacilli was also enhanced on supplementation of B‐vitamins, leading to increased bioconversion of isoflavones in soymilk. The concentration of genistein was decreased, accompanied by an increased concentration of genistein on fermentation in the presence of thiamine, niacinamide, biotin, calcium pantothenate and folic acid. Additionally, the supplementation of niacinamide, calcium pantothenate, biotin and folic acid also led to lower concentrations of malonyl daidzin, indicating increased hydrolysis of malonyl daidzin to daidzin. Results from the present study indicated that the supplementation of B‐vitamins could enhance the bioactive potential and bioconversion of isoflavones in lactobacilli‐fermented soymilk.Originality/valueThis work has shown that the supplementation of B‐vitamins in lactobacilli fermented soymilk has exerted in vitro ACE‐inhibitory activity and increased the accumulation of bioactive isoflavone aglycones. To the authors' knowledge, this is the first evaluation reporting on such aspects.
Extraction, characterization and utilization of rice bran protein concentrate for biscuit making
Authors: Yadav Ritika B. , Yadav Baljeet S. , Chaudhary Deepu 
Published: September 2011

PurposeThe purpose of this paper is to study the utilization of the rice bran protein concentrate (RBPC) in biscuits to upgrade the nutritional quality.Design/methodology/approachExtraction of rice bran protein concentrate (RBPC) from defatted rice bran was standardized using alkali extraction method. Defatted rice bran and RBPC were analyzed for their proximate composition. RBPC was analyzed for its bulk density, foaming capacity (FC), emulsion activity (EA), and water and oil absorption capacity. RBPC was incorporated in biscuits at 5, 10 and 15 per cent levels. The biscuits were analyzed for their physicochemical, fracture strength (texture analyzer) and sensory attributes (nine‐point hedonic scale) to assess their acceptability.FindingsThe maximum yield of 13.2 per cent for RBPC was obtained at alkaline pH of 11, temperature of 60°C and extraction time of 60 minutes. The bulk density, foaming capacity, emulsifying ability, water and oil absorption capacity of RBPC were 0.4 g/ml, 11 per cent, 40 per cent, 2.9 ml/g and 2.3 ml/g respectively. The protein content of biscuits increased significantly from 7.3 per cent in control biscuits to 15.4 per cent in the 15 per cent RBPC supplemented biscuits with their fracture strength also significantly higher than the control biscuits (p<0.05). Replacement of refined wheat flour up to 10 per cent RBPC produced protein‐enriched biscuits with desirable overall acceptability.Originality/valueRice bran protein concentrate can be beneficially utilized to formulate protein enriched biscuits with enhanced nutritional value especially for malnourished or undernourished people.
Effect of lemon juice on the survival of Salmonella Enteritidis and Escherichia coli in cig kofte (raw meatball)
Authors: Baris Bingol Enver , Cetin Omer , Muratoglu Karlo 
Published: September 2011

PurposeThe purpose of this study is to investigate the effect of lemon juice on the survival of Salmonella Enteritidis and Escherichia coli in cig kofte (raw meatball).Design/methodology/approachCig kofte samples were inoculated one by one with both bacteria at high inoculum levels and were treated with different doses of fresh lemon juice (2, 5, 10 and 15 ml) for 10 seconds, 30 seconds, and 1, 5, 15, 30 and 60 minutes.FindingsTreatments of lemon juice for different exposure times caused reduction ranging between 0.1 and 1.7 log CFU/g for Salmonella Enteritidis and 0.1 and 2.1 log CFU/g for E.coli. Results showed that lemon juice caused slight decrease in Salmonella Enteritidis and E.coli as an immediate inhibitor, but this effect increased with concentration and time.Originality/valueThis is a research study to provide information on the effectiveness of lemon juice which is squeezed generally before eating cig kofte, on the presence of the surface flora to strengthen the hygienic quality of the product. Inactivation effect of lemon juice on Salmonella Enteritidis and E.coli may give a practical and easy way of providing food safety for cig kofte.
Antioxidant activity, total phenolic compounds and flavonoids of mangoes coming from biodynamic, organic and conventional cultivations in three maturation stages
Authors: Fonseca Maciel Leonardo , da Silva Oliveira Cassiane , da Silva Bispo Eliete , da P. Spínola Miranda Maria 
Published: September 2011

PurposePhenolic compounds, including flavonoids, are nutritionally important for their antioxidant activities and protective functions against disease risk caused by oxidative stress. These compounds are primarily found in fruits, and mangoes are an important source. This paper aims to address these issues.Design/methodology/approachIn this work, the antioxidant activities of mangoes cultivated in three different ways were evaluated by their ability to capture free radicals using the DPPH radical.FindingsThe results showed that the biodynamic mangoes had highest antioxidant activity in mature‐green and ripe fruits, while for those of organic origin the antioxidant activity was highest in unripe fruits. The organic mangoes also showed highest values of phenolic compounds at all maturation stages. The mangoes from conventional crops had lower values for all parameters evaluated in this study than the organically and biodynamically cultivated fruits.Originality/valueThis work brings an important contribution in the field of agriculture at a time when organic and biodynamic systems of cultivation are an alternative to the conventional system and that pollutes the environment and produces food that contains quantities of chemical contaminants that can damage the health of the consumer. The comparison in phenolic compounds content, flavonoids and antioxidant activity in biodynamic, organic and conventional systems is original and of great importance, showing that the ecological cropping systems are less harmful to the environment and promote improvements to the chemical composition of foods.
A “librarian‐LIS faculty” divide in open access practice
Authors: Xia Jingfeng , Kay Wilhoite Sara , Lynette Myers Rebekah 
Published: September 2011

PurposeThis paper seeks to examine a librarian‐faculty divide in authors' OA contributions with regard to article self‐archiving and OA consumptions with regard to citation counts.Design/methodology/approachThis paper measures the OA availabilities and citations of scholarly articles from 20 top‐ranked LIS journals published in 2006. A logistic regression analysis is taken to make the comparisons.FindingsIt finds that there is no correlation between the numbers of OA articles and the professional status of the authors. However, librarian authors differ from faculty authors in the citation and self‐citation rates of their articles. There are also differences between these two groups of authors in co‐authorship and the numbers of article pages and references.Originality/valueThis study takes a new approach to compare the publications of librarians and faculty in library and information science for their open access availability and citations. The findings may help OA advocates and administrators to make appropriate policy changes.