gebhart/patrepeval huggingface dataset:
Reactions of trifluoromethyl bromide and related halides: part 9. Comparison between additions to carbonyl compounds, enamines, and sulphur dioxide in the presence of zinc (1990)

A Barbier procedure, under moderate pressure, was used for the trifluoromethylation of various carbonyl compounds, starting from trifluoromethyl bromide and zinc in pyridine. Trifluoromethyl methanols were obtained from aldehydes and trifluoromethyl ketones from activated esters. Ethyl benzoate, or acetone, induced the formation of the solvated trifluoromethylzinc derivatives which did not react with carbonyl compounds. Consequently, the Barbier condensation in that case was considered to involve nascent organometallics reacting near the zinc surface. The reaction with sulphur dioxide, leading to trifluoromethanesulphinate, showed striking differences from that of carbonyl compounds. It was shown that the main pathway occurred in solution. This condensation was interpreted by the initial formation of sulphur dioxide radical anion, which reacts with trifluoromethyl bromide by a single-electron-transfer process. Attempts to condense iminium salts failed when a hydrogen atom was lacking in the α position. When the iminium ion can be transformed in situ to an enamine, a reaction occurred, leading to α-trifluoromethyl ketones. This condensation was interpreted by a chain mechanism involving trifluoromethyl radicals.
A Novel Nonthermal Energy Source for Surgical Epicardial Atrial Ablation: Irreversible Electroporation (2007)

We propose a new modality to perform atrial ablations, which holds the potential of providing very swift, precise, and complete transmurality with no local heating effects.
Regulation of major histocompatibility complex class II antigens on human alveolar macrophages by granulocyte–macrophage colony‐stimulating factor in the presence of glucocorticoids (1999)

Alveolar macrophages (AM) present antigen poorly to CD4+ T cells and respond weakly to interferon-gamma (IFN-gamma) for up-regulation of major histocompatibility complex (MHC) class II and costimulatory molecule expression. In atopic asthma, however, AM exhibit enhanced antigen-presenting cell (APC) activity. Since granulocyte-macrophage colony-stimulating factor (GM-CSF) is increased in the airways of asthmatic patients, we have investigated its role in modulating the APC function of AM. The effects of glucocorticoids were also studied since earlier studies showed optimal induction of MHC antigens on monocytes by GM-CSF in their presence. GM-CSF in the presence, but not the absence, of dexamethasone enhanced the expression of HLA-DR, -DP and -DQ antigens by AM. However AM and monocytes differed in the optimal concentration of steroid required to mediate this effect (10-10 m and 10-7 m, respectively). Induction of MHC antigens was glucocorticoid specific and independent of IFN-gamma. These studies suggest the existence of an IFN-gamma-independent pathway of macrophage activation, which may be important in regulating APC function within the lung.
Some Observations on the Relation of the High-Frequency Bed Ballistocardiogram to that Obtained from an Aperiodic Bed (1955)

A previous analysis of the mechanical behavior of current ballistocardiographic systems allowed the prediction of certain relationships between records from the Starr high-frequency bed and those representing undistorted forces applied to the body by the cardiovascular "generator." The latter were obtained by recording the acceleration of an "aperiodic mercury bed" platform. A relationship between the form of these two types of records from 80 subjects was sought. In varying types of normal and abnormal records the predicted relationship between the two different kinds of ballistocardiograms was consistently observed. It is concluded that records from the high-frequency bed grossly reflect the slower forces applied to the body, but are distorted with respect to phase, amplitude and frequency content, this being due in part to the elastic properties of the dorsal surface of the body and in part to the weight and stiffness of the platform support.
Noncytotoxic combinations of topical antimicrobial agents for use with cultured skin substitutes (1995)

Cultured skin grafts are destroyed more easily than split-thickness skin grafts by common burn wound organisms, including gram-negative and gram-positive bacteria and fungi. To increase the survival and engraftment of cultured skin grafts, formulations of antimicrobial agents were tested for cytotoxicity to cultured human keratinocytes and fibroblasts and for activity against common organisms from burn wounds. On the basis of previous studies, a base formulation containing neomycin (40 micrograms/ml), polymyxin B (700 U/ml), and mupirocin (40 micrograms/ml) was prepared, to which ciprofloxacin (20 micrograms/ml) or norfloxacin (20 micrograms/ml) and amphotericin B (0.25 microgram/ml) or nystatin (100 U/ml) were added. Toxicity to cultured human cells was determined by the growth response of cell cultures (n = 6) to each drug combination over 4 days. Activity against clinical isolates (n = 40) of Staphylococcus aureus, Pseudomonas aeruginosa, other gram-negative bacteria, and Candida spp. was determined by the wet disc assay. Analysis of variance testing showed no significant differences in the growth of keratinocytes or fibroblasts under control or experimental conditions. Medium without antimicrobial agents was not effective against any of the 40 microbial strains tested. The base formulation was effective against all bacterial strains tested but against none of the fungi, while all experimental formulations were effective against all microbial strains tested. These findings suggest that neomycin, mupirocin, and polymyxin B may be combined with a quinolone and an antimycotic agent to provide broad antimicrobial activity for a formulation for topical use with cultured skin on burns. However, the formulations described here are strictly experimental and are not recommended for clinical use without further evaluation.
Potassium titanyl phosphate: properties and new applications (1989)

Potassium titanyl phosphate (KTP) is a unique nonlinear-optical material that is being widely used for second-harmonic generation of Nd lasers emitting near 1 μm. KTP is also attractive for various sum- and difference-frequency and optical parametric applications over its entire transparency range from 0.35 to 4.5 μm. Its combination of large electro-optic coefficients and low dielectric constants makes KTP potentially useful for various electro-optic applications, and, in particular, it has a figure of merit for an optical waveguide modulator that is nearly a factor of 2 larger than that for any other inorganic material. Low-loss optical waveguides can be formed in KTP, and several electro-optic and nonlinear-optic devices have been fabricated that confirm that KTP is also a superior material for many optical waveguide applications.
Enabling Seamless Wireless Power Delivery in Dynamic Environments (2013)

Effective means of delivering wireless power to volumes of spaces will enable users the freedom and mobility to seamlessly power and recharge their devices in an unencumbered fashion. This has particular importance for consumer electronic, medical, and industrial applications, where usage models focus on unstructured and dynamic environments. However, existing wireless power technology falls short of this vision. Inductive charging solutions are limited to near-contact distances and require a docking station or precise placement for effective operation. Far-field wireless power techniques allow much greater range, but require complicated tracking systems to maintain a line-of-sight connection for high-efficiency power delivery to mobile applications. Recent work using magnetically coupled resonators (MCRs) for wireless power delivery has shown a promising intersection between range (on the order of a meter), efficiency (over 80%), and delivered power (up to tens of watts). However, unpredictable loads rapidly change system operating points, and changes in position disrupt system efficiency, which affects the ultimate usability of these systems. Dynamic adaptation to these changes in operating conditions and power transfer range is a critical capability in developing a fully functional and versatile wireless power solution. This paper provides an overview of methods used to adapt to variations in range, orientation, and load using both wideband and fixed-frequency techniques.
Perceptions on the development of a care pathway for people diagnosed with schizophrenia on acute psychiatric units (2003)

Policy development and practice for hospital mental health care has shifted towards a user-focused and evidence-based direction. Important within this policy development has been a guideline for inpatient care, particularly the establishment of an inpatient Acute Care Forum. A vehicle to both commission and develop this agenda is the Implementation of a care pathway. A research study was designed to explore how a care pathway could be developed for inpatients diagnosed with schizophrenia. Interviews with a range of health care professionals and observation of the process of care pathway development were the data-collection tools. Analysis was driven by emergent themes across the data set. Themes were then presented as one possible interpretation of the factors to be considered for the development of a care pathway for people diagnosed with schizophrenia. Clinicians experienced many difficulties in finding and including evidence-based practice (EBP) within a care pathway. Professions on the whole felt that there was a certain futility to psychiatric care given the paucity of evidence to support practice. This may contribute towards the poor use of hospital care as a therapeutic intervention as part of the wider spectrum of care. Difficulties arise when trying to develop a care pathway with EBP, given the paucity of knowledge on why certain interventions are only partially effective. The development of a care pathway may inform the priorities of the inpatient Acute Care Forum for people diagnosed with schizophrenia. A care pathway should not be constrained, however, to EBP and should incorporate therapeutic activities to improve the overall experience of service users. Limitations on the study and the collection of evidence supporting these conclusions conclude the paper.
Maize Transposable Elements in Development and Evolution (1989)

Transposable elements were first discovered in maize by Barbara McClintock more than 40 years ago. Today it is apparent that transposable elements are a common component of the genetic material in virtually all organisms. The best studied maize transposable elements belong to the Activator-Dissociation and Suppressor-mutator families. They are short DNA sequences that consist of genes required for mobility and regulation. Both the expression and the mobility of transposable elements are regulated in development by a mechanism that relies on the methylation of element sequences critical for expression. Elements can be stably inactivated by the same mechanism, persisting in the genome in a cryptic form for long periods. The ability of the host organism to regulate the highly mutagenic transposable elements may be critical to their survival, as well as their utility as agents of genomic change.
Cannabinoid Type-1 Receptor Reduces Pain and Neurotoxicity Produced by Chemotherapy (2012)

Painful peripheral neuropathy is a dose-limiting complication of chemotherapy. Cisplatin produces a cumulative toxic effect on peripheral nerves, and 30-40% of cancer patients receiving this agent experience pain. By modeling cisplatin-induced hyperalgesia in mice with daily injections of cisplatin (1 mg/kg, i.p.) for 7 d, we investigated the anti-hyperalgesic effects of anandamide (AEA) and cyclohexylcarbamic acid 3'-carbamoyl-biphenyl-3-yl ester (URB597), an inhibitor of AEA hydrolysis. Cisplatin-induced mechanical and heat hyperalgesia were accompanied by a decrease in the level of AEA in plantar paw skin. No changes in motor activity were observed after seven injections of cisplatin. Intraplantar injection of AEA (10 μg/10 μl) or URB597 (9 μg/10 μl) transiently attenuated hyperalgesia through activation of peripheral CB₁ receptors. Co-injections of URB597 (0.3 mg/kg daily, i.p.) with cisplatin decreased and delayed the development of mechanical and heat hyperalgesia. The effect of URB597 was mediated by CB₁ receptors since AM281 (0.33 mg/kg daily, i.p.) blocked the effect of URB597. Co-injection of URB597 also normalized the cisplatin-induced decrease in conduction velocity of Aα/Aβ-fibers and reduced the increase of ATF-3 and TRPV1 immunoreactivity in dorsal root ganglion (DRG) neurons. Since DRGs are a primary site of toxicity by cisplatin, effects of cisplatin were studied on cultured DRG neurons. Incubation of DRG neurons with cisplatin (4 μg/ml) for 24 h decreased the total length of neurites. URB597 (100 nM) attenuated these changes through activation of CB₁ receptors. Collectively, these results suggest that pharmacological facilitation of AEA signaling is a promising strategy for attenuating cisplatin-associated sensory neuropathy.
Oral Immunization of Dogs with Purified Cholera Toxin, Crude Cholera Toxin, or B Subunit: Evidence for Synergistic Protection by Antitoxic and Antibacterial Mechanisms (1982)

The immunogenicity and safety of purified cholera toxin (CT), its B subunit, and a crude culture filtrate of toxigenic Vibrio cholerae (CrT) were compared in dogs immunized orally and challenged with virulent V. cholerae. CT and CrT caused marked protection in two- or three-dose regimens. Protection due to CT occurred only with doses that caused transient, sometimes severe, diarrhea in most dogs; this protection was proportional to the peak antitoxin response in jejunal mucosa and lasted at least 15 weeks. In contrast, minimum protective doses of CrT contained much less cholera toxin, caused very mild diarrhea in only 21% of the dogs, and evoked protection that was greater than predicted from the modest jejunal antitoxin response. B subunit caused smaller jejunal antitoxin responses than did similar doses of CT and was poorly protective, the 50% protective dose being >40-fold greater than that of CT. Two observations indicated that protection due to CrT involved synergy between antibacterial and antitoxic immune responses. First, the 50% protective dose of CrT was 24-fold and >36-fold smaller than the 50% protective doses of its CT and non-CT antigenic components, respectively, when tested separately. Second, protection was greater in CrT-immunized dogs than in CT-immunized dogs for a given mucosal antitoxin response. Low doses of CrT evoked serotype-specific protection, indicating that the serotype-specific O somatic antigen contributed significatly to antibacterial protection. These results suggest that a simple, effective, nonliving oral vaccine for cholera based on combined antibacterial and antitoxic immunity can probably be achieved. However, further studies are needed to determine how a protective antitoxic response can be evoked without causing diarrhea during immunization.
Cross-Recognition of Two Middle T Protein Epitopes by Immunodominant Polyoma Virus-Specific CTL (1999)

We recently identified the immunodominant epitope for polyoma virus-specific CTL as the Dk-associated peptide MT389-397 derived from the middle T (MT) viral oncoprotein. Another Dk-restricted peptide corresponding to residues 236-244 of MT was recognized by nearly all MT389-397-reactive CTL clones, but required concentrations at least 2 logs higher to sensitize syngeneic target cells for lysis. Except for identity at the three putative Dk-peptide anchor residues, MT236-244 shares no homology with MT389-397. Using a novel europium-based class I MHC-peptide binding immunoassay, we determined that MT236-244 bound Dk 2-3 logs less well than MT389-397. Infection with a mutant polyoma virus whose MT is truncated just before the MT389-397 epitope or immunization with MT389-397 or MT236-244 peptides elicited CTL that recognized both MT389-397 and MT236-244. Importantly, infection with a polyoma virus lacking MT389-397 and mutated in an MT236-244 Dk anchor position induced polyoma virus-specific CTL recognizing neither MT389-397 nor MT236-244 epitopes. Despite predominant usage of the Vbeta6 gene segment, MT389-397/MT236-244 cross-reactive CTL clones possess diverse complementarity-determining region 3beta domains; this is functionally reflected in their heterogeneous recognition patterns of alanine-monosubstituted MT389-397 peptides. Using Dk/MT389-397 tetramers, we directly visualized MT236-244 peptide-induced TCR down-modulation of virtually all MT389-397-specific CD8+ T cells freshly explanted from polyoma-infected mice, suggesting that a single TCR recognizes both Dk-restricted epitopes. The availability of immunodominant epitope-specific CTL capable of recognizing a second epitope in MT, a viral protein essential for tumorigenesis, may serve to amplify the CTL response to the immunodominant epitope and prevent the emergence of immunodominant epitope-loss viruses and virus-induced tumors.
Carotid Pressure Is a Better Predictor of Coronary Artery Disease Severity Than Brachial Pressure (2001)

The mechanisms relating pulse pressure to cardiovascular outcome may include surrogacy for coronary disease severity. Although pulse pressure is typically measured at the brachial artery, central pulse pressure and its principal determinant, large-artery stiffness, may relate more closely to disease severity. This study aimed to determine the relationships between large-artery stiffness and carotid and brachial blood pressures and coronary artery disease severity. One hundred fourteen male patients with coronary artery disease (age 60+/-8 years, mean+/-SD) and 57 age-matched healthy male controls (age 59+/-9 years) were recruited. Patients were classified into 2 groups based on the magnitude of their maximum coronary stenosis: moderate (50% to 89%) and severe (>/=90%). Large-artery stiffness was assessed as systemic arterial compliance and carotid-femoral pulse wave velocity. Mean pressure was not different between the 3 groups. Systemic compliance and carotid pulse pressure were significantly different between all 3 groups, with compliance lowest and pressure highest in the severe group (P<0.05). Pulse wave velocity was higher in patients with severe stenosis than in those with moderate stenosis (P<0.01) and those in the control group (P<0.001). Brachial pulse pressure was higher in patients than in controls (P<0.05), but there was no difference between the 2 disease groups. In separate multivariate analyses, carotid pressures and systemic arterial compliance were determinants of coronary artery disease severity, independent of age, smoking status, body mass index, mean arterial pressure, heart rate, cholesterol levels (total, LDL, and HDL), triglycerides, and beta-antagonist and lipid-lowering therapy (P<0.001), whereas brachial pressures and pulse wave velocity were not. In conclusion, central blood pressures and systemic arterial compliance are more sensitive markers of coronary artery disease severity than brachial pressures.
Potential Interference of Cyclobenzaprine and Norcyclobenzaprine with HPLC Measurement of Amitriptyline and Nortriptyline: Resolution by GC-MS Analysis (1995)

Cyclobenzaprine and its major metabolite, norcyclobenzaprine, differ from amitriptyline and nortriptyline only by the presence of a double bond in the cycloheptane ring. Three patients developed sufficient levels of cyclobenzaprine and norcyclobenzaprine because of either rapid or long-term ingestion of cyclobenzaprine to cause positive interferences in both a Syva EMIT assay and a high-performance liquid chromatographic (HPLC) assay for identification and quantitation of tricyclic antidepressants in serum. Cyclobenzaprine coeluted with amitriptyline, and norcyclobenzaprine eluted slightly earlier than, but was poorly resolved from, nortriptyline in this HPLC assay. We found that cyclobenzaprine could be distinguished from amitriptyline and that norcyclobenzaprine could be distinguished from nortriptyline on the basis of gas chromatographic retention times upon gas chromatographic-mass spectrometric analyses after derivatization with trifluoroacetic anhydride. The compounds were also distinguishable by mass spectrometric criteria.
The R2R3‐MYB transcription factor HAG1/MYB28 is a regulator of methionine‐derived glucosinolate biosynthesis in Arabidopsis thaliana (2007)

Methionine-derived glucosinolates belong to a class of plant secondary metabolites that serve as chemoprotective compounds in plant biotic defense reactions and also exhibit strong anticancerogenic properties beneficial to human health. In a screen for the trans-activation potential of various transcription factors toward glucosinolate biosynthetic genes, we could identify the HAG1 (HIGH ALIPHATIC GLUCOSINOLATE 1, also referred to as MYB28) gene as a positive regulator of aliphatic methionine-derived glucosinolates. The content of aliphatic glucosinolates as well as transcript levels of aliphatic glucosinolate biosynthetic genes were elevated in gain-of-function mutants and decreased in HAG1 RNAi knock-down mutants. Pro(HAG1):GUS expression analysis revealed strong HAG1 promoter activity in generative organs and mature leaves of A. thaliana plants, the main sites of accumulation of aliphatic glucosinolates. Mechanical stimuli such as touch or wounding transiently induced HAG1/MYB28 expression in inflorescences of flowering plants, and HAG1/MYB28 over-expression reduced insect performance as revealed by weight gain assays with the generalist lepidopteran herbivore Spodoptera exigua. Expression of HAG1/MYB28 was significantly induced by glucose, indicating a novel transcriptional regulatory mechanism for the integration of carbohydrate availability upon biotic challenge. We hypothesize that HAG1/MYB28 is a novel regulator of aliphatic glucosinolate biosynthesis that controls the response to biotic challenges.
Thrombin Potently Stimulates Cytokine Production in Human Vascular Smooth Muscle Cells but Not in Mononuclear Phagocytes (1996)

Thrombosis frequently occurs during atherogenesis and in response to vascular injury. Accumulating evidence supports a role for inflammation in the same situation. The present study therefore sought links between thrombosis and inflammation by determining whether thrombin, which is present in active form at sites of thrombosis, can elicit inflammatory functions of human monocytes and vascular smooth muscle cells (SMCs), two major constituents of advanced atheroma. Human alpha-thrombin (EC50, approximately equal to 500 pmol/L) potently induced interleukin (IL)-6 release from SMCs. The tethered-ligand thrombin receptor appeared to mediate this effect. Furthermore, alpha-thrombin also rapidly increased levels of mRNA encoding IL-6 and monocyte chemotactic protein-1 (MCP-1) in SMCs. In contrast, only alpha-thrombin concentrations of > or = 100 nmol/L could stimulate release of IL-6 or tumor necrosis factor-alpha (TNF alpha) in peripheral blood monocytes or monocyte-derived macrophages. Lipid loading of macrophages did not augment thrombin responsiveness. Likewise, only alpha-thrombin concentrations of > or = 100 nmol/L increased levels of IL-6, IL-1 beta, MCP-1, or TNF alpha mRNA in monocytes. Differential responses of SMCs and monocytes to thrombin extended to early agonist-mediated increases in [Ca2+]i. SMCs and endothelial cells, but not monocytes, contained abundant mRNA encoding the thrombin receptor and displayed cell surface thrombin receptor expression detected with a novel monoclonal antibody. Thus, the level of thrombin receptors appeared to account for the differential thrombin susceptibility of SMCs and monocytes. These data suggest that SMCs may be more sensitive than monocytes/macrophages to thrombin activation in human atheroma. Cytokines produced by thrombin-activated SMCs may contribute to ongoing inflammation in atheroma complicated by thrombosis or subjected to angioplasty.