bluuebunny/crossref_metadata_2025_split huggingface dataset:
The quasi‐randomness of hypergraph cut properties
Authors: Shapira Asaf , Yuster Raphael 
Published: March 2011

AbstractLet
$\alpha_1,\ldots,\alpha_k$
satisfy $\sum_i\alpha_i=1$
and suppose a k‐uniform hypergraph on n vertices satisfies the following property; in any partition of its vertices into k sets $A_1,\ldots,A_k$
of sizes $\alpha_1n,\ldots,\alpha_kn$, the number of edges intersecting $A_1,\ldots,A_k$
is (asymptotically) the number one would expect to find in a random k‐uniform hypergraph. Can we then infer that H is quasi‐random? We show that the answer is negative if and only if $\alpha_1=\cdots=\alpha_k=1/k$. This resolves an open problem raised in 1991 by Chung and Graham [J AMS 4 (1991), 151–196].While hypergraphs satisfying the property corresponding to
$\alpha_1=\cdots=\alpha_k=1/k$
are not necessarily quasi‐random, we manage to find a characterization of the hypergraphs satisfying this property. Somewhat surprisingly, it turns out that (essentially) there is a unique non quasi‐random hypergraph satisfying this property. The proofs combine probabilistic and algebraic arguments with results from the theory of association schemes. © 2011 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2011
Security analysis and enhancement for three‐party password‐based authenticated key exchange protocol
Authors: Zhao Jianjie , Gu Dawu , Zhang Lei 
Published: March 2011

ABSTRACTRecently, Tzung‐Her Chen, Wei‐Bin Lee, and Hsing‐Bai Chen (CLC) proposed a new three‐party password‐based authenticated key exchange (3PAKE) protocol. This CLC protocol needs not store the security‐sensitive table on the server side, which reduces the danger of the server being compromised; also, it has the advantage in terms of the round efficiency and computational cost. However, we find that the leakage of values VA and VB in the CLC protocol will make a man‐in‐the‐middle attack feasible in practice. On the basis of this finding, we present a modified 3PAKE protocol called I‐CLC protocol, which is essentially an improved CLC protocol. I‐CLC can resist attacks available, including the man‐in‐the‐middle attack that we mentioned on the initial CLC protocol. Meanwhile, the new protocol allows that the participants choose their own passwords by themselves; additionally, the computation cost of I‐CLC is lower than that of CLC protocol. Copyright © 2011 John Wiley & Sons, Ltd.
A key distribution scheme using network coding for mobile ad hoc network
Authors: Liu Jianwei , Du Ruiying , Chen Jing , He Kun 
Published: March 2011

ABSTRACTNetwork coding offers an excellent solution for maximizing throughput in various networks. Because of its simplicity and high efficiency, the idea of network coding can also be used for designing lightweight key distribution schemes for wireless ad hoc network. This paper presents a key distribution scheme that exploits the inherent security properties of network coding. The new scheme relies on simple XOR network coding operations to provide data confidentiality and uses message authentication codes to guarantee the integrity of the distributed keys. We also show that our scheme can resist a series of attacks in wireless ad hoc network and has better performance compared with previous schemes proposed in the literature. Copyright © 2011 John Wiley & Sons, Ltd.
LiFePO4 Mesocrystals for Lithium‐Ion Batteries
Authors: Popovic Jelena , Demir‐Cakan Rezan , Tornow Julian , Morcrette Mathieu , Su Dang Sheng , Schlögl Robert , Antonietti Markus , Titirici Maria‐Magdalena 
Published: March 2011

AbstractOlivine LiFePO4 is considered one of the most promising cathode materials for Li‐ion batteries. A simple one‐step, template‐free, low‐temperature solvothermal method is developed for the synthesis of urchinlike hierarchical mesocrystals of pristine LiFePO4 as well as carbon‐coated LiFePO4 composites. Each urchinlike mesocrystal consists of LiFePO4 sheets self‐assembled via a dipolar field in spheres during a solvothermal process under the influence of Cl− anions. The obtained primary sheets of LiFePO4 are single crystalline in nature and can be coated in situ with an amorphous nitrogen‐doped carbonaceous layer several nanometers in thickness. To increase the conductivity of the carbon coating, the materials are subjected to further temperature treatment (700 °C) under an inert atmosphere. The lithium storage performance of the pure LiFePO4 is compared with that of its carbon‐coated counterparts.
Response of lesser prairie‐chickens on leks to aerial surveys
Authors: McRoberts Jon T. , Butler Matthew J. , Ballard Warren B. , Wallace Mark C. , Whitlaw Heather A. , Haukos David A. 
Published: March 2011

AbstractAerial surveys can be used to detect and monitor lesser prairie‐chicken (Tympanuchus pallidicinctus) leks, but the need exists to understand the response of lesser prairie‐chickens to survey aircraft. We conducted lek surveys in Texas and New Mexico, USA, using an R‐22 Beta II helicopter and R‐44 Raven II helicopter. We observed the behavior of lesser prairie‐chickens at 44 leks during aerial lek surveys. We observed flush responses of 38.5% (20.2–59.4%; 95% CI) and 50.0% (26.0–74.0%) from the R‐22 and R‐44, respectively. We found no difference in flush response between helicopter types (P = 0.326). We used logistic regression models to predict lesser prairie‐chicken flush response to aerial surveys. We found that distance from the transect was the most important flush response predictor during helicopter surveys. When flushed, lesser prairie‐chickens returned to the lek and resumed predisturbance behavior in 7.0 ± 2.6 min (mean ± 95% CI). Our results suggest aerial surveys can be conducted without disruption to the lesser prairie‐chicken lek dynamic. © 2011 The Wildlife Society.
Modifying elk (Cervus elaphus) behavior with electric fencing at established fence‐lines to reduce disease transmission potential
Authors: Fischer Justin W. , Phillips Gregory E. , Baasch David M. , Lavelle Michael J. , Vercauteren Kurt C. 
Published: March 2011

AbstractDirect and indirect contact through fences at cervid farms with only a single perimeter fence may play a role in transmission of diseases such as chronic wasting disease or bovine tuberculosis (Mycobacterium bovis). We report a case study examining effectiveness of a baited electric fence, as an addition to an existing single woven‐wire fence (2.4 m high), for altering behavior and reducing fence‐line contact between elk (Cervus elaphus). We used a video‐surveillance system to monitor one 20‐m‐long test fence at an elk ranch in north‐central Colorado, USA from 2006 to 2007. We conducted 26 trials (11 without electric fence during 48.2 total cumulative days and 15 with electric fence during 63.7 days) with different levels of motivation for contact between groups of elk separated by the test fence. We documented 426 contacts between elk (direct transmission risk) or the woven‐wire fence (indirect transmission risk) during trials without the electric fence. We documented 0 contacts between adult elk or the woven‐wire fence during trials when the electric fence was in place. During our case study, 24 of 25 elk exposed to the electric fence were completely deterred. We emphasize that our approach targets behavior modification of farmed elk routinely exposed to the electric fence, not wild elk that may occasionally approach from the outside. Our results suggest that adding a baited electric fence inside an existing woven‐wire–fenced enclosure has potential to provide a cost‐effective means to minimize contacts between farmed and wild elk. © 2011 The Wildlife Society.
Modeling habitat potential for Canada lynx in Michigan
Authors: Linden Daniel W. , Campa Henry , Roloff Gary J. , Beyer Dean E. , Millenbah Kelly F. 
Published: March 2011

AbstractIn the ruling to list Canada lynx (Lynx canadensis) as a federally threatened species, the U.S. Fish and Wildlife Service (USFWS) identified the Great Lakes region as an area that historically contained lynx and, hence, could potentially contribute to population recovery. More recent critical habitat designations by the USFWS only recognize Minnesota, USA as important to recovery in the Great Lakes. Although there is no current evidence of a resident lynx population in the Upper Peninsula (UP) of Michigan, USA, trapping and track records over the past century suggest the region was periodically invaded after lynx population irruptions in Canada. In support of state and federal agency efforts in Michigan to provide and conserve lynx habitat, we quantified habitat potential using a spatially explicit, landscape‐level model based on relationships among lynx, their primary prey, snowshoe hare (Lepus americanus), and vegetation attributes. Outputs from the model indicated that habitat in the UP supports low hare densities (<0.07–0.75 hares/ha). Corresponding potential lynx densities ranged from 0/100 km2 in the southern and northeast UP to 5/100 km2 in the central–eastern UP. Model estimates of potential hare density were correlated with winter track‐surveys (R2 = 0.4, P < 0.001). Current absence of a resident lynx population in Michigan is likely attributed to confounding factors (e.g., habitat, competition, status of source population) but our results indicate that current habitat quality, quantity, and spatial configuration are exerting large‐scale negative influences. These results are generally consistent with the USFWS determination that Michigan's UP most likely functions as dispersal habitat. © 2011 The Wildlife Society.
Effects of road construction noise on the endangered golden‐cheeked warbler
Authors: Lackey Melissa A. , Morrison Michael L. , Loman Zachary G. , Fisher Nancy , Farrell Shannon L. , Collier Bret A. , Wilkins R. Neal 
Published: March 2011

AbstractNoise pollution can mask or distort bird songs, which can inhibit mating success, predator detection, and parental response to begging calls. Using an impact assessment design, we examined the potential influence of road construction and road noise on territory placement, reproductive success, and density of the federally endangered golden‐cheeked warbler (Dendroica chrysoparia) at 3 sites: adjacent to road construction, adjacent to road‐noise only, and a control with no noise or activity. Although not statistically significant, reproductive success was about 20% higher and stable at road‐noise‐only sites relative to other treatments. Warbler density was similar among sites (construction = 0.305 birds/ha; road‐noise = 0.357 birds/ha; and control = 0.328 birds/ha). Average distance from road was similar for territories with paired adults (road‐noise = 291 m [SE = 26], construction = 263 m [SE = 19]) and those with successful pairs (road‐noise = 292 m [SE = 27]), construction = 243 m [SE = 21]). Overall noise levels were low: ambient noise was similar in the construction and road‐noise‐only sites ( = 32 dB) and showed little auditory difference from the control ( = 28 dB). Our results indicate that construction activities and road‐noise did not appear to impact territory placement, reproductive success, or local densities of golden‐cheeked warblers under the treatment regime we studied. © 2011 The Wildlife Society.
Evaluation of Sonic Dissuader® to reduce damage by pileated woodpeckers
Authors: Tupper Shelagh K. , Cummings John L. , Andelt William F. , Werner Scott J. , Harness Richard E. 
Published: March 2011

AbstractWoodpecker damage to utility poles results in significant monetary losses to utility companies worldwide. Most techniques for repelling woodpeckers from utility poles are costly, difficult to install, effective for a limited time, or ineffective. We evaluated the Sonic Dissuader for detecting and deterring pileated woodpecker (Dryocopus pileatus) damage to wooden utility poles in controlled flight pens. The Sonic Dissuader emits pileated woodpecker and avian predator calls contingent upon pecking by woodpeckers. Ratios of departure were lower and woodpeckers spent more time after a pecking event on the pole with the Sonic Dissuader compared to the control pole (paired t = 6.26, df = 7, P < 0.001, and F1,4 = 5.00, P = 0.089, respectively). This may substantiate observed behavior of pileated woodpeckers to freeze when confronted with a predator. We did not observe differences in amount of time spent on poles, amount of time spent pecking on poles, and weight of wood chips removed from poles with and without the Sonic Dissuader. We propose that testing distress calls or other repellents as potential deterrents in combination with detection technology is warranted. © 2011 The Wildlife Society.
Structural Studies of Several Ru3 and Ru4 Carbonyl Clusters
Authors: Bruce Michael I. , Humphrey Paul A. , Skelton Brian W. , White Allan H. 
Published: March 2011

AbstractThe preparation, characterisation and single‐crystal XRD molecular structure determinations of the three Ru3 carbonyl clusters attached to carbon ligands, Ru3(μ‐H)3(μ3‐CBr)(CO)9 (1), Ru3(μ‐H)(μ‐dppm){μ‐C(OMe)}(CO)8 (2) and AuRu3(μ‐H)2(μ3‐C=C=CHPh)(CO)10 (3) are reported, together with the structures of the tetranuclear hydrido‐carbonyls Ru4(μ‐H)4–2x(CO)11+x(PPh3) (x = 0 4, 1 5).
Laparoscopic Liver Resection in Patients with a History of Upper Abdominal Surgery
Authors: Ahn Keun Soo , Han Ho‐Seong , Yoon Yoo‐Seok , Cho Jai Young , Kim Ji Hoon 
Published: March 2011

AbstractBackgroundThe liver is the organ where tumors most frequently metastasize. Hepatic recurrence after resection of hepatocellular carcinoma also occasionally occurs. With the increasing use of laparoscopic surgery for hepatic tumors, there may be a high probability that laparoscopic liver resection can be performed in patients with a surgical history. The purpose of this study was to assess the feasibility and clinical outcomes of laparoscopic liver resection in patients a history of upper abdominal surgery.MethodsOf 202 laparoscopic liver resections, 47 patients underwent laparoscopic liver resection after previous upper abdominal surgery between January 2004 and July 2009. Fifty‐five previous surgeries were performed in the 47 patients. The previous types of surgical procedures included hepatobiliary and pancreatic (HPB) procedures (n = 25) and non‐HPB procedures (colorectal malignancies, subtotal gastrectomy, and splenectomy; n = 22).ResultsIn patients with a history of surgery, the mean operative time for laparoscopic liver resection was 312.3 min and the mean blood loss was 481.0 ml. In 42 patients (89.4%), there were severe adhesions in the hepatoduodenal ligament and hilar areas. Transfusion was required in 7 patients (14.9%). There was one conversion to a laparotomy due to severe adhesions. Complications occurred in 11 patients (23.4%) and the mean hospital stay was 10.6 days. When we compare patients with and without a history of surgery, there were no differences in the above‐mentioned perioperative results. However, among patients with a history of surgery, patients who underwent HPB procedures had longer operative times and higher postoperative morbidities than those who had not undergone HPB procedures.ConclusionLaparoscopic liver resection in patients with a history of upper abdominal surgery is feasible and safe.
The Role of Liver‐directed Surgery in Patients with Hepatic Metastasis from a Gynecologic Primary Carcinoma
Authors: Kamel Sarah I. , de Jong Mechteld C. , Schulick Richard D. , Diaz‐Montes Teresa P. , Wolfgang Christopher L. , Hirose Kenzo , Edil Barish H. , Choti Michael A. , Anders Robert A. , Pawlik Timothy M. 
Published: March 2011

AbstractBackgroundThe management of patients with liver metastasis from a gynecologic carcinoma remains controversial, as there is currently little data available. We sought to determine the safety and efficacy of liver‐directed surgery for hepatic metastasis from gynecologic primaries.MethodsBetween 1990 and 2010, 87 patients with biopsy‐proven liver metastasis from a gynecologic carcinoma were identified from an institutional hepatobiliary database. Fifty‐two (60%) patients who underwent hepatic surgery for their liver disease and 35 (40%) patients who underwent biopsy only were matched for age, primary tumor characteristics, and hepatic tumor burden. Clinicopathologic, operative, and outcome data were collected and analyzed.ResultsOf the 87 patients, 30 (34%) presented with synchronous metastasis. The majority of patients had multiple hepatic tumors (63%), with a median size of the largest lesion being 2.5 cm. Of those patients who underwent liver surgery (n = 52), most underwent a minor hepatic resection (n = 44; 85%), while 29 (56%) patients underwent concurrent lymphadenectomy and 45 (87%) patients underwent simultaneous peritoneal debulking. Postoperative morbidity and mortality were 37% and 0%, respectively. Median survival from time of diagnosis was 53 months for patients who underwent liver‐directed surgery compared with 21 months for patients who underwent biopsy alone (n = 35) (p = 0.01). Among those patients who underwent liver‐directed surgery, 5‐year survival following hepatic resection was 41%.ConclusionsHepatic surgery for liver metastasis from gynecologic cancer can be performed safely. Liver surgery may be associated with prolonged survival in a subset of patients with hepatic metastasis from gynecologic primaries and therefore should be considered in carefully selected patients.
Protein inhibitor of activated STAT3 expression in lung cancer
Authors: Kluge Amy , Dabir Snehal , Vlassenbroeck Ilse , Eisenberg Rosana , Dowlati Afshin 
Published: March 2011

AbstractProtein Inhibitor of Activated Signal Transducer and Activators of Transcription 3 (PIAS3) is an endogenous inhibitor of STAT3 transcriptional activity. We have previously demonstrated the concentration‐dependent negative regulatory effect of PIAS3 on STAT3 signaling and its capacity to decrease lung cancer proliferation and synergize with epidermal growth factor inhibition. We now investigate PIAS3 expression in both non‐small cell lung cancer (NSCLC) cell lines and human resected NSCLC specimens. We also investigated the mechanism by which some lung cancers have significantly decreased PIAS3 expression. Expression of PIAS3 is variable in lung cancer cells lines with 2 of 3 squamous cell carcinoma (SCC) cell lines having no or little PIAS3 protein expression. Similarly, the majority of human SCCs of the lung lack PIAS3 expression by immunohistochemistry; this despite the finding that SCCs have significantly higher levels of PIAS3 mRNA compared to adenocarcinomas. High PIAS3 expression generally correlates with decreased phosphorylated STAT3 in both SCC cell lines and human specimens compatible with the negative regulatory effect of this protein on STAT3 signaling. To investigate this variable expression of PIAS3 we first performed sequencing of the PIAS3 gene that demonstrated single nucleotide polymorphisms but no mutations. Exposure of lung cancer cells to 5‐azacytidine and trichostatin A results in a significant increase in PIAS3 mRNA and protein expression. However, methylation‐specific PCR demonstrates a lack of CpG island methylation in the promoter region of PIAS3. Exposure of cells to an agent blocking proteosomal degradation results in a significant increase in PIAS3. Our data thus shows that SCC of the lung commonly lacks PIAS3 protein expression and that post‐translational modifications may explain this finding in some cases. PIAS3 is a potential therapeutic molecule to target STAT3 pathway in lung cancer.
The influence of selenium-enriched milk proteins and selenium yeast on plasma selenium levels and rectal selenoprotein gene expression in human subjects
Authors: Hu Ying , McIntosh Graeme H. , Le Leu Richard K. , Upton Jane M. , Woodman Richard J. , Young Graeme P. 
Published: March 2011

Certain forms of dietary Se may have advantages for improving human Se status and regulating the risk for disease, such as cancers, including colorectal cancer (CRC). The present study compared the effects of a Se-enriched milk protein (dairy-Se) with a Se-rich yeast (yeast-Se) on plasma Se levels and rectal selenoprotein gene expression since we reasoned that if these genes were not regulated, there was little potential for regulating the risk for CRC in this organ. A total of twenty-three healthy volunteers with plasma Se in the lower half of the population range were supplemented with dairy-Se (150 μg/d) or yeast-Se (150 μg/d) for 6 weeks, followed by 6 weeks of washout period. Blood was sampled every 2 weeks, and rectal biopsies were obtained before and after Se supplementation and after the washout period. Plasma Se levels and glutathione peroxidase (GPx) activity, and rectal mRNA of selenoprotein P (SeP), cytosolic GPx-1 (GPx-1), gastrointestinal GPx-2 (GPx-2) and thioredoxin reductase-1 (TrxR-1) were measured. Plasma Se levels increased rapidly in both Se groups (P < 0·001); plasma GPx activity was not significantly changed. RectalSePmRNA increased at 6 weeks compared with baseline in both Se groups (P < 0·05); only dairy-Se resulted in a sustained elevation ofSePafter the washout period (P < 0·05). RectalGPx-1andGPx-2mRNA were higher with dairy-Se (P < 0·05) than with yeast-Se at 6 weeks. In conclusion, three rectal selenoprotein mRNA were differentially regulated by dairy-Se and yeast-Se. Changes in rectal selenoproteins are not predicted by changes in plasma Se; dairy-Se effectively regulates the expression of several rectal selenoproteins of relevance to the risk for CRC.
Black tea is not significantly different from water in the maintenance of normal hydration in human subjects: results from a randomised controlled trial
Authors: Ruxton Carrie H. , Hart Valerie A. 
Published: March 2011

There is a belief that caffeinated drinks, such as tea, may adversely affect hydration. This was investigated in a randomised controlled trial. Healthy resting males (n21) were recruited from the general population. Following 24 h of abstention from caffeine, alcohol and vigorous physical activity, including a 10 h overnight fast, all men underwent four separate test days in a counter-balanced order with a 5 d washout in between. The test beverages, provided at regular intervals, were 4 × 240 ml black (i.e. regular) tea and 6 × 240 ml black tea, providing 168 or 252 mg of caffeine. The controls were identical amounts of boiled water. The tea was prepared in a standardised way from tea bags and included 20 ml of semi-skimmed milk. All food taken during the 12 h intervention period was controlled, and subjects remained at rest. No other beverages were offered. Blood was sampled at 0, 1, 2, 4, 8 and 12 h, and a 24 h urine sample was collected. Outcome variables were whole blood cell count, Na, K, bicarbonate, total protein, urea, creatinine and osmolality for blood; and total volume, colour, Na, K, creatinine and osmolality for urine. Although data for all twenty-one participants were included in the analysis (mean age 36 years and mean BMI 25·8 kg/m2), nineteen men completed all conditions. Statistical analysis, using a factorial ANOVA approach within PROC MIXED, revealed no significant differences between tea and water for any of the mean blood or urine measurements. It was concluded that black tea, in the amounts studied, offered similar hydrating properties to water.