gebhart/patrepeval huggingface dataset:
Differential pulse voltammetric determination of cobalt with a perfluorinated sulfonated polymer-2,2-bipyridyl modified carbon paste electrode (1991)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential pulse voltammetric determination of cobalt with a perfluorinated sulfonated polymer-2,2-bipyridyl modified carbon paste electrodeZhiqiang. Gao, Guangqing. Wang, Peibiao. Li, and Zhofan. ZhaoCite this: Anal. Chem. 1991, 63, 10, 953–957Publication Date (Print):May 15, 1991Publication History Published online1 May 2002Published inissue 15 May 1991https://pubs.acs.org/doi/10.1021/ac00010a004https://doi.org/10.1021/ac00010a004research-articleACS PublicationsRequest reuse permissionsArticle Views192Altmetric-Citations30LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Taking probiotics during pregnancy. Are they useful therapy for mothers and newborns? (2005)

An increasing body of evidence suggests that probiotics are effective for treating bacterial vaginosis and allergic reactions. Most probiotics available in Canada, however, are of dubious quality, and, for many claimed indications, there is no proof of effectiveness yet.
A Convenient Method for Determining the Concentration of Grignard Reagents (1994)

Abstract A convenient procedure for the quantitative assay of alkyl, aryl, and vinyl Grignard reagent concentrations is described. Through the combined use of menthol and 1,10-phenanthroline in dry tetrahydrofuran solution, vivid violet or burgundy end points materialize and are easily observed. Other advantages unique to the new protocol are also discussed.
Antibiotic‐Heparin Lock: In Vitro Antibiotic Stability Combined with Heparin in a Central Venous Catheter (2000)

Long-term hemodialysis frequently requires vascular access through central venous catheters (CVCs). Infection related to these catheters is a significant complication. The use of an antibiotic-heparin lock could decrease the risks associated with infected permanent catheters. As an initial step in developing an antibiotic-heparin lock, we investigated the in vitro stability of antibiotic-heparin combinations in CVCs. Initially, cefazolin, vancomycin, ceftazidime, ciprofloxacin 10 mg/ml each, and gentamicin 5 mg/ml were incubated separately in glass test tubes in the dark at 37 degrees C for 72 hours. Samples were analyzed spectrophotometrically for stability at 24-hour intervals. The procedure was repeated with the addition of heparin (final concentration 5000 U/ml in glass test tubes), and the combination was also examined in CVCs. High-performance liquid chromatography analysis was conducted on the antibiotic-heparin combinations at 72 hours to confirm the spectrophotometric results. Ciprofloxacin produced an immediate precipitate with the addition of heparin and was not analyzed further. Absorbance values decreased for all antibiotics, with the greatest decreases at 72 hours for cefazolin (27.4%), vancomycin (29.7%), ceftazidime (40.2%), and gentamicin (8%) when combined with heparin. These decreases were postulated to be secondary to adsorption of the antibiotics to the luminal surface of the catheters because submitting the catheters to ultrasound with 1% sodium bicarbonate and analyzing the resulting solution for absorbance revealed that some of the drug was recovered. Although free antibiotic in CVC solution was reduced, the concentration should be sufficient (approximately 5 mg/ml) to decrease the frequency of infections associated with CVCs. We conclude that the concentrations of vancomycin, ceftazidime, cefazolin, or gentamicin used in our study should be sufficient for an antibiotic-heparin lock.
Components for the Design of Lamina Emergent Mechanisms (2007)

This paper presents components for lamina emergent mechanism (LEM) that can be used as building blocks to create mechanisms capable of more complex motion. As the name suggests, lamina emergent mechanisms are fabricated out of planar materials (the lamina) but their motion is out of that plane (emergent). Lamina emergent mechanisms can provide benefits that include reduced manufacturing costs and minimal volume when in the planar state. The compact initial state of LEMs is beneficial in reducing shipping costs, especially in volume critical applications. LEMs also exhibit the potential benefits of compliant mechanisms, namely increased precision, reduced weight, reduced wear, and part count reduction. Due to the deflection of their members, compliant mechanisms have the ability to store energy, and the resulting effect can be used to perform the function of springs. The LEM components presented in this paper include flexible segments, and mechanisms with behaviors similar to planar change-point four-bar and six-bar mechanisms, and spherical change-point mechanisms.
Hypothermia during Reperfusion after Asphyxial Cardiac Arrest Improves Functional Recovery and Selectively Alters Stress-Induced Protein Expression (2000)

This study examined whether prolonged hypothermia induced 1 hour after resuscitation from asphyxial cardiac arrest would improve neurologic outcome and alter levels of stress-related proteins in rats. Rats were resuscitated from 8 minutes of asphyxia resulting in cardiac arrest. Brain temperature was regulated after resuscitation in three groups: normothermia (36.8 degrees C x 24 hours), immediate hypothermia (33 degrees C x 24 hours, beginning immediately after resuscitation), and delayed hypothermia (33 degrees C x 24 hours, beginning 60 minutes after resuscitation). Mortality and neurobehavioral deficits were improved in immediate and delayed hypothermia rats relative to normothermia rats. Furthermore, both immediate and delayed hypothermia improved neuronal survival in the CA1 region of the hippocampus assessed at 14 days. In normothermia rats, the 70-kDa heat shock protein (Hsp70) and 40-kDa heat shock protein (Hsp40) were increased within 12 hours after resuscitation in the hippocampus. Delayed hypothermia attenuated the increase in Hsp70 levels in the hippocampus but did not affect Hsp70 induction in the cerebellum. Hippocampal expression of Hsp40 was not affected by hypothermia. These data indicate that prolonged hypothermia during later reperfusion improves neurologic outcome after experimental global ischemia and is associated with selective changes in the pattern of stress-induced protein expression.
Antimicrobial activity of some plant extracts having hepatoprotective effects (2009)

The antimicrobial activity of hot water and ethanolic extracts of six plant extracts, utilized in Pakistan for the cure of liver damage, were studied. The extracts ofAcacia arabica, Nymphaea lotus, Sphareranthus hirtus, Emblica officinalis, Cinchorium intybus and Cardus marianum were tested in vitro against seven bacterial species and two fungal species by well-diffusion method and micro-dilution methods. The patterns of inhibition varied with the plant extracts, the solvent used for extraction and the organisms tested. Escherichia coli, Salmonella typhi, Pseudomonas aeroginosa were the most inhibited microorganisms. The extract of Sphareranthu hirtus was the most active against multi-drug resistantPseudomonas aeruginosa and enterohemorrhagic E. coli 0157 EHEC. The ethanolic extract of S. hirtus exhibited a higher effect than the hot water extract. These plants extracts were analyzed for elemental composition.

	 

	Key words: Antimicrobial agents, plant extracts, enterohemorrhagic Escherichia coli 0157 EHEC, multi-drug resistant Pseudomonas aeruginosa, Salm
Multivariate Normal Mixtures (2000)

This chapter contains sections titled: Introduction Heteroscedastic Components Homoscedastic Components Standard Errors Assessment of Model Fit Examples of Univariate Normal Mixtures Examples of Multivariate Normal Mixtures Properties of MLE for Normal Components Options Spurious Local Maximizers Example 3.10: Prevalence of Local Maximizers Alternative Models for Component-Covariance Matrices Some Other Models
ChemInform Abstract: Chemical Vapor Deposition of FeCox and FeCoxOy Thin Films from Fe‐Co Carbonyl Clusters. (1988)

Abstract Thin Fe‐Co alloy films have been deposited on glass substrates by CVD using HFeCo 3 (CO) 12 (I) or CpFeCo(CO)6 (II) sources, vaporization temp. 5‐10 °C, below the melting points of the carbonyl complexes (85 and 52 °C for (I) and (II) resp.), deposition temp. of 300‐350 °C, and CO as carrier gas.
Polynomial-time Construction of Contraction Hierarchies for Multi-criteria Objectives (2013)

We consider multicriteria shortest path problems and show that contraction hierarchies — a very powerful speed-up technique originally developed for standard shortest path queries in [7] — can be constructed efficiently for the case of arbitrary conic combinations of the edge costs. This extends previous results in [5] which considered only the bicriteria case and discrete weights for the objective functions. On the theory side we prove a polynomial time bound for determining whether a path π is part of the lower envelope of all pareto-optimal paths via some polyhedral arguments. Experiments complement these results by showing the practicability of our approach.
Evaluating the effectiveness of term frequency histograms for supporting interactive web search tasks (2008)

Throughout many of the different types of Web searches people perform, the primary tasks are to first craft a query that effectively captures their information needs, and then evaluate the search results seeking relevant documents. However, the top Web search engines generally provide little support for users in these tasks. WordBars is a next-generation Web search interface that provides an interactive histogram representation of the most frequently appearing terms within the titles and snippets of the top 100 search results. In this paper, the results of a user study are presented in which the ability of the participants to find relevant documents using the features of WordBars is measured. Most participants were able to find more relevant documents using WordBars when compared to the original order of the search results. Subjective reactions were very positive, with all the participants rating the interactive features of WordBars highly.
Strain and Temperature Measurement using Transmission-type EFPI Optical Fiber Sensors (2001)

The extrinsic Fabry-Perot interferometric (EFPI) optical fiber sensor shows good sensitivity and resolution, and has many advantages over optical fiber sensors of other types. However, this EFPI optical fiber sensor has a disadvantage that the distinction of measuring directions is difficult due to the measurement method by using only fringe counting. In this paper, the transmission-type extrinsic Fabry-Perot interferometric (TEFPI) optical fiber sensor was developed, which has been improved by the additional function and whose measuring system is different from that of the conventional EFPI optical fiber sensor. Then the application result of the TEFPI optical fiber sensor to the strain and temperature measurement was explained in detail.
Regulatory Serum Lipoproteins: Regulation of Lymphocyte Stimulation by a Species of Low Density Lipoprotein (1976)

Low density lipoproteins (LDL) containing apolipoprotein B were separated from 15 fresh normal human serum pools by three independent isolation methods including sequential ultracentrifugal flotation, affinity chromatography, and polyanion precipitation. A discrete subpopulation of LDL (LDL-In) was isolated which possessed comparable inhibitory activity for PHA, PWM, and allogenic cell stimulated human lymphocytes in vitro at concentrations of 1 to 10 mug protein/1 x 10(5) lymphocytes/0.25 ml culture. LDL-In was characterized by a mean buoyant density of 1.055 g/ml in KBr, a m.w. of 2 to 3 x 10(6) daltons and a composition of 20 to 25% protein and 75 to 80% lipid with beta electrophoretic mobility. The biologic activity of LDL-In was non-cytotoxic, independent of mitogen concentration, and dependent upon the concentration of serum in the culture assay. The effect was temporally dependent requiring approximately 24 hr for induction of a stable suppressed state. Suppression was reversible with shorter periods of exposure to LDL-In. LDL-In did not inhibit lymphocytes at periods greater than 19 hr after stimulation, suggesting that LDL-In may influence metabolis events associated with the inductive phase of lymphocyte activation by lectins and allogeneic cells. LDL-In was clearly distinguishable from T lymphocyte E rosette inhibitory factor since it did not influence E rosette function of lymphocytes. The physicochemical and biologic properties of LDL-In clearly distinguish this reguloratory lipoprotein from previously described immunoregulatory factors.
Token-based Fast Authentication for Wireless Network (2009)

Wireless Networks based on WIFI or WIMAX become popular and are used in many places as compliment network to wired LAN to support mobility. The support of mobility of clients, the continuous access anywhere and anytime make WLAN preferable network for many applications. However, there are some issues associated with the usage of WLAN that put some restriction on adapting this technology everywhere. These issues are related to using the best routing algorithm to achieve good performance of throughput and delay, and to securing the open access to avoid attacks at the physical and MAC layer. IEEE 802.1x, suggested a solution to address the security issue at the MAC layer and but there are varieties of implementations address this solution and they differ in performance. IEEE 802.1af tried to address other security issue remained at the MAC layer but it is still at early stage and need verification for easy deployment. In this paper a new technique for securing wireless network using fast token-based authentication has been invented to address the vulnerability inherited by the wireless network at the MAC layer using fast authentication process. This technique is based on an authentication server distributing a security token, public authentication key, and network access key parameter to eligible mobile client MCs during registration. All messages will be encrypted during registration using temporary derived token key, but it will use derived valid token key during authentication. Authenticated MCs will then use derived group temporal key generated from the network access parameter key to encrypt all messages exchanged over the wireless network. The token, the authentication key and the access network parameter key will be only distributed during registration. This makes the security parameters known only to authentication server, authenticator and MC. Hence, this technique will protect the wireless network against attack since attackers are unable to know the token and other security keys. Moreover, it will avoid the exchange of public keys during authentication such as the one used in other existing technologies, and consequently speedup the authentication phase which is very critical to wireless technologies.
Timing verification of sequential dynamic circuits (1999)

This paper addresses static timing verification for sequential circuits implemented in a mix of static and dynamic logic. We restrict our focus to regular domino logic and footless domino logic, a variant of domino logic. First we derive constraints for proper operation of dynamic gates. An important observation is that for dynamic gates, input signals may start changing near the end of the evaluate phase without compromising correct operation. This gives the circuit designer extra flexibility. We present two verification methods. Both are based on the Sakallah-Mudge-Olukotun (SMO) model for static timing analysis of sequential circuits. The first method models dynamic gates explicitly. The signals at the terminals of the dynamic gates are modeled by five events: the earliest/latest, rising/falling transitions, and a fifth event that models the occurrence of a spurious rising transition. The second method applies the original SMO model after a preprocessing step that computes the combinational delays. A postprocessing step checks the constraints specific to dynamic gates. The relationship between both methods is studied. We show that the second method may result in a more conservative analysis than the first method, but at a lower computational cost. We also examine a less aggressive set of constraints, which disallows spurious transitions. A detailed example illustrating the important features of the model is presented, and an electrical simulation of that circuit is performed. The results demonstrate the practical relevance of the methods.
Ku-band 16×16 planar array with aperture-coupled microstrip-patch elements (1998)

The design and development of a Ku-band linearly polarized 16/spl times/16 microstrip-patch array is presented. The array is fed by a corporate network, using dog-bone shaped coupling apertures. Thin substrates and low-loss foam are used for antenna-bandwidth enhancement. The design of the radiating patches and feed network was aided by the commercial software package, Ensemble(R). Experimental results for the array, in terms of its return loss, radiation pattern, and gain, are presented.
Extending IP to Low-Power, Wireless Personal Area Networks (2008)

Extending IP to low-power, wireless personal area networks (LoWPANs) was once considered impractical because these networks are highly constrained and must operate unattended for multiyear lifetimes on modest batteries. Many vendors embraced proprietary protocols, assuming that IP was too resource-intensive to be scaled down to operate on the microcontrollers and low-power wireless links used in LoWPAN settings. However, 6LoWPAN radically alters the calculation by introducing an adaptation layer that enables efficient IPv6 communication over IEEE 802.15.4 LoWPAN links.
Nitrogen‐Doped Ordered Mesoporous Carbon Supported Bimetallic PtCo Nanoparticles for Upgrading of Biophenolics (2016)

Hydrodeoxygenation (HDO) is an attractive route for the upgrading of bio-oils produced from lignocellulose. Current catalysts require harsh conditions to effect HDO, decreasing the process efficiency in terms of energy and carbon balance. Herein we report a novel and facile method for synthesizing bimetallic PtCo nanoparticle catalysts (ca. 1.5 nm) highly dispersed in the framework of nitrogen-doped ordered mesoporous carbon (NOMC) for this reaction. We demonstrate that NOMC with either 2D hexagonal (p6m) or 3D cubic (Im3‾ m) structure can be easily synthesized by simply adjusting the polymerization temperature. We also demonstrate that PtCo/NOMC (metal loading: Pt 9.90 wt %; Co 3.31 wt %) is a highly effective catalyst for HDO of phenolic compounds and "real-world" biomass-derived phenolic streams. In the presence of PtCo/NOMC, full deoxygenation of phenolic compounds and a biomass-derived phenolic stream is achieved under conditions of low severity.
Distinct cellular localization of mRNAs for three subtypes of prostaglandin E receptor in kidney (1994)

Distribution of the mRNAs for three subtypes of prostaglandin E (PGE) receptors in the mouse kidney was investigated by in situ hybridization. The mRNA for EP1 subtype, which is coupled to Ca2+ mobilization, was specifically localized to the collecting ducts from the cortex to the papilla. The mRNA for EP2 subtype, which is linked to stimulation of adenylate cyclase, was localized to the glomeruli. The mRNA for EP3 subtype, which is coupled to inhibition of adenylate cyclase, was located densely in the tubules in the outer medulla and in the distal tubules in the cortex. These results exhibit distinct cellular localization of three subtypes of PGE receptor in the kidney and suggest that PGE2 exerts multiple functions via these subtypes expressed in different segments of the nephron.
Sublimation of Higher Fullerenes and Their Interaction with Silicon (100) Surface (1995)

The heat of sublimation of C-60, C-70, C-78, C-84, and C-96 is measured by modulated molecular beam mass spectrometry (MMBMS). For a mixture of these fullerenes the heat of sublimation is 39 +/- 5, 43 +/- 5, 47 +/- 18, 59 +/- 6, and 65 +/- 11 kcal/mol, respectively, and did not change with the variation in composition. The partial pressure of C-84 is estimated to be P-84 = 7.0 x 10(12) exp[-59.4 kcal/mol/RT] Torr. The scattering of C-70 and C-84 from Si(100) is also investigated by MMBMS. The behavior of C-84 is quite similar to that of C-60 reported earlier By Hamza, Balooch, and Moalem (Surf. Sci. 1994, 317, L1129) except that the onset of surface decomposition of the fullerene occurs at 850 g, 150 K lower than for C-60. When the surface temperature reaches 1000 K, total decomposition of the incident C-84 is observed. The behavior of C-70 is surprisingly different from both C-60 and C-84 Twenty percent of the incident C-70 decomposes at 1000 K, and the remaining 80% does not decompose until a target temperature of 1200 K is reached. At surface temperatures below 800 K, for the interaction of C-70 and C-84 with silicon, the dominant surface processes are adsorption with near perfect sticking probability, followed by surface diffusion to the edge of the specimen and desorption. The ratio of desorption rate constant kd, to diffusion coefficient, D-s, for C-70 and C-84 was calculated to be 2.7 x 10(16) exp(-40 (kcal/mol/RT) and 7.8 x 10(7) exp(-22 (kcal/mol/RT) cm(-2), respectively.
Generalized filtering configurations with applications in digital and optical signal and image processing (1999)

Ankara : Department of Electrical and Electonics Engineering and Institute of Engineering and Sciences, Bilkent Univ., 1999.
Comparison Of BTEX Attenuation Rates Under Anaerobic Conditions (2010)

Over the last decade data have been published that demonstrate that natural attenuation of hydrocarbons in the subsurface is dominated by anaerobic processes. Some data have indicated that benzene is recalcitrant; some have shown it degrades but at a slower rate than alkyl benzenes (primarily TEX) under anaerobic conditions. Many natural attenuation studies have pointed to the sequential order of attenuation. This paper evaluated data from four sites in the Midwestern U.S. (Illinois, Indiana, Michigan, and Missouri) that explain and contrast existing impressions. Although the actual attenuation rates varied from site to site, primarily dependent upon the relative availability of electron acceptors, data from these sites indicated that attenuation of BTEX compounds under anaerobic conditions is concurrent. The benzene attenuation rate appeared to be a function of the relative abundance of TEX. The ratios of attenuation rates between the compounds, however, appear to be relatively constant within certain brackets. For example, of the BTEX compounds, at the four sites in this study, toluene attenuated at the highest rate followed by benzene which attenuated at average rates between 70 and 80% of toluene, xylenes which attenuated at average rates between 60 and 70% of toluene (which may be dependent upon which xylenes are most abundant), and lastly ethylbenzene which attenuated at average rates 50 to 60% as high as toluene. These were observed at both natural and sulfate-enhanced attenuation sites.