Scavenging of photogenerated oxidative species by antimuscarinic drugs: atropine and derivatives.
Criado, Susana; Guardianelli, Carina; Tuninetti, Jimena; Molina, Patricia; García, Norman A
2002-01-01
The quenching ability of photogenerated oxidative species by some antimuscarinic drugs generically named atropines (e.g. atropine [I] eucatropine [II], homatropine [III] and scopolamine [IV]) have been investigated employing stationary photolysis, polarographic detection of dissolved oxygen, stationary and time-resolved fluorescence spectroscopy, and laser flash photolysis. Using Rose Bengal as a dye sensitiser for singlet molecular oxygen, O(2)((1)Delta(g)), generation, compounds I-IV behave as moderate chemical plus physical quenchers of the oxidative species. Correlation between kinetic and electrochemical data indicates that the process is possibly driven by a charge-transfer interaction. The situation is somewhat more complicated employing the natural pigment riboflavin (Rf) as a sensitiser. Compounds I and II complex Rf ground state, diminishing the quenching ability towards singlet and triplet excited state of the pigment. On the other hand, compounds III and IV effectively quench Rf excited states, protecting the pigment against photodegradation. Under anaerobic conditions, semireduced Rf (Rf(.-)) is formed through quenching of excited triplet Rf. Nevertheless, although Rf(.-) is a well-known generator of the reactive species superoxide radical anion by reductive quenching in the presence of oxygen, the process of O(2)((1)Delta(g)) production prevails over superoxide radical generation, due to the relatively low rate constants for the quenching of triplet Rf by the atropines (in the order of 10(7) M(-1)s(-1) for compounds III and IV) in comparison to the rate constant for the quenching by ground state oxygen, approximately two orders of magnitude higher, yielding O(2)((1)Delta(g)). Compound I is the most promising O(2)((1)Delta(g)) physical scavenger, provided that it exhibits the higher value for the overall quenching rate constant and only 11% of the quenching process leads to its own chemical damage.
Atropine and Other Anticholinergic Drugs
2007-01-01
compromise near- who first analyzed the pharmacology and toxicol- vision in the case of accidental use. Military re- ogy of tabun obtained from captured...Lipp JA and Dola TJ (1978). Effect of atropine upon 290-293. the cerebrovascular system during soman-induced NakajimaT.Ohta S. Morita H etal. (1997...sarin: Clinical manifes- Wills JH (1963). Pharmacological antagonists of the tations and treatment of accidental poisoning by anticholinesterase agents
Effectiveness study of atropine for progressive myopia in Europeans
Polling, J.R.; Kok, R.G.; Tideman, J.W.; Meskat, B.; Klaver, C.C.W.
2016-01-01
PurposeRandomized controlled trials have shown the efficacy of atropine for progressive myopia, and this treatment has become the preferred pattern for this condition in Taiwan. This study explores the effectiveness of atropine 0.5% treatment for progressive high myopia and adherence to therapy in a
Suppression of torsades de pointes by atropine.
Tan, H L; Wilde, A A; Peters, R J
1998-01-01
A 67 year old woman with a history of chronic atrial fibrillation presented with asthma cardiale. She took no medication and there was no family history of long QT syndrome. She was treated with furosemide, nitroprusside, acenocoumarol, and digoxin. Two days later excessively prolonged RR intervals, which were terminated by escape beats with a right bundle branch block morphology, suggested impending total AV block. There was also severe QT (0.48 s) and QTc (0.56) interval prolongation with bizarre inverted TU waves and multifocal premature ventricular complexes within the U waves. The patient experienced angina pectoris followed by episodes of torsades de pointes, which were interpreted as the result of bradycardia, and the bradycardia as the result of high grade AV block induced by increased vagal tone caused by ischaemia in the presence of digoxin intoxication (serum digoxin was 2.5 micrograms/l). Subsequent atropine infusion sped up the ventricular rate and shortened the QT (0.39) and QTc (0.51) intervals. Digoxin was replaced by metoprolol to control ventricular rate and angina pectoris. Within days, QT and QTc intervals became normal and the U waves disappeared. Neither torsades de pointes nor angina pectoris recurred. Based on a review of the literature, it is suggested that the electrophysiological mechanism of this effect is not only an increase of the heart rate, but also a direct action of muscarinic receptor antagonism on Purkinje cells and ventricular refractoriness.
Wang, W; Chen, Q-F; Ruan, H-L; Chen, K; Chen, B; Wen, J-M
2014-11-01
A case of organophosphate (OP) poisoning was admitted to the emergency room. The patient accepted treatment with pralidoxime (PAM), atropine, and supporting therapy. It was observed that even after 22 h after treatment, 960 mg of atropine was not enough for the patient to be atropinized. However, a 160-mg follow-up treatment of anisodamine was quite enough for atropinization after 4 h. As a case report, more studies are required before any definite conclusion can be reached regarding the use of anisodamine as a potential substitute for high-dose atropine in cases of OP poisoning.
Nedeljkovic, Ivana; Ostojic, Miodrag; Beleslin, Branko; Djordjevic-Dikic, Ana; Stepanovic, Jelena; Nedeljkovic, Milan; Stojkovic, Sinisa; Stankovic, Goran; Saponjski, Jovica; Petrasinovic, Zorica; Giga, Vojislav; Mitrovic, Predrag
2006-01-01
Background Dipyridamole and dobutamine stress echocardiography testing are most widely utilized, but their sensitivity remained suboptimal in comparison to routine exercise stress echocardiography. The aim of our study is to compare, head-to-head, exercise, dobutamine and dipyridamole stress echocardiography tests, performed with state-of-the-art protocols in a large scale prospective group of patients. Methods Dipyridamole-atropine (Dipatro: 0.84 mg/kg over 10 min i.v. dipyridamole with addition of up to 1 mg of atropine), dobutamine-atropine (Dobatro: up to 40 mcg/kg/min i.v. dobutamine with addition of up to 1 mg of atropine) and exercise (Ex, Bruce) were performed in 166 pts. Of them, 117 pts without resting wall motion abnormalities were enrolled in study (91 male; mean age 54 ± 10 years; previous non-transmural myocardial infarction in 32 pts, angina pectoris in 69 pts and atypical chest pain in 16 pts). Tests were performed in random sequence, in 3 different days, within 5 day period under identical therapy. All patients underwent coronary angiography. Results Significant coronary artery disease (CAD; ≥50% diameter stenosis) was present in 69 pts (57 pts 1-vessel CAD, 12 multivessel CAD) and absent in 48 pts. Sensitivity (Sn) was 96%, 93% and 90%, whereas specificity (Sp) was 92%, 92% and 87% for Dobatro, Dipatro and Ex, respectively (p = ns). Concomitant beta blocker therapy did not influence peak rate-pressure product and Sn of Dobatro and Dipatro (p = ns). Conclusion When state-of-the-art protocols are used, dipyridamole and dobutamine stress echocardiography have comparable and high diagnostic accuracy, similar to maximal post-exercise treadmill stress echocardiography. PMID:16672046
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Petrasinovic Zorica
2006-05-01
Full Text Available Abstract Background Dipyridamole and dobutamine stress echocardiography testing are most widely utilized, but their sensitivity remained suboptimal in comparison to routine exercise stress echocardiography. The aim of our study is to compare, head-to-head, exercise, dobutamine and dipyridamole stress echocardiography tests, performed with state-of-the-art protocols in a large scale prospective group of patients. Methods Dipyridamole-atropine (Dipatro: 0.84 mg/kg over 10 min i.v. dipyridamole with addition of up to 1 mg of atropine, dobutamine-atropine (Dobatro: up to 40 mcg/kg/min i.v. dobutamine with addition of up to 1 mg of atropine and exercise (Ex, Bruce were performed in 166 pts. Of them, 117 pts without resting wall motion abnormalities were enrolled in study (91 male; mean age 54 ± 10 years; previous non-transmural myocardial infarction in 32 pts, angina pectoris in 69 pts and atypical chest pain in 16 pts. Tests were performed in random sequence, in 3 different days, within 5 day period under identical therapy. All patients underwent coronary angiography. Results Significant coronary artery disease (CAD; ≥50% diameter stenosis was present in 69 pts (57 pts 1-vessel CAD, 12 multivessel CAD and absent in 48 pts. Sensitivity (Sn was 96%, 93% and 90%, whereas specificity (Sp was 92%, 92% and 87% for Dobatro, Dipatro and Ex, respectively (p = ns. Concomitant beta blocker therapy did not influence peak rate-pressure product and Sn of Dobatro and Dipatro (p = ns. Conclusion When state-of-the-art protocols are used, dipyridamole and dobutamine stress echocardiography have comparable and high diagnostic accuracy, similar to maximal post-exercise treadmill stress echocardiography.
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Srinivas Kakhandki
2012-01-01
Full Text Available A case of unknown compound poisoning is presented. It was initially treated as organophosphate poisoning with lack of response. A timely diagnosis of acute methaemoglobinaemia and iatrogenic atropine toxicity was made based on clinical evaluation. Treatment of methaemoglobinaemia using oral methylene blue and of atropine toxicity with supportive measures could save the patient.
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Min Zhou
2011-01-01
Full Text Available A Ru(bpy3 2+-based electrochemiluminescence (ECL detection coupled with capillary electrophoresis (CE was developed for the determination of atropine sulfate on the basis of an Eu-PB modified platinum electrode as the working electrode. The analyte was injected to separation capillary of 50 cm length (25 μm i.d., 360 μm o.d. by electrokinetic injection for 10 s at 10 kV. Parameters related to the separation and detection were discussed and optimized. It was proved that 10 mM phosphate buffer at pH 8.0 could achieve the most favorable resolution, and the high sensitivity of detection was obtained by using the detection potential at 1.15 V and 5 mM Ru(bpy3 2+ in 80 mM phosphate buffer at pH 8.0 in the detection reservoir. Under the optimized conditions, the ECL peak area was in proportion to atropine sulfate concentration in the range from 0.08 to 20 μg⋅mL−1 with a detection limit of 50 ng⋅mL−1 (3σ. The relative standard derivations of migration time and peak area were 0.81 and 3.19%, respectively. The developed method was successfully applied to determine the levels of atropine sulfate in urine samples of patients with recoveries between 90.9 and 98.6%.
DEFF Research Database (Denmark)
Wetterslev, J; Jarnvig, I; Jørgensen, L N
1991-01-01
The effects of a split-dose of atropine sulphate versus a single dose of glycopyrrolate given with neostigmine for the reversal of gallamine-induced neuromuscular blockade were studied in 55 patients undergoing gynaecological surgery. The patients were randomized to receive either a single dose...... of glycopyrrolate (7 micrograms.kg-1) or two doses of atropine (8 micrograms.kg-1 each), given with an interval of 1 min. There were no differences between the two methods with respect to percentage heart rate changes, salivation or arousal time. Four patients demonstrated cardiac arhythmias in the atropine group......, whereas none occurred in the glycopyrrolate group (P less than 0.05). It is concluded that a split-dose of atropine has similar chronotropic effects to a single dose of glycopyrrolate for the reversal of gallamine-induced neuromuscular blockade. However, the finding of a higher incidence of cardiac...
Anticonvulsants for Nerve Agent-Induced Seizures: The Influence of the Therapeutic Dose of Atropine
2007-01-01
Organophosphorous nerve agents-induced cological Basis of Therapeutics, 10th ed. (Hardman JG, Limbird LE, and ( Gilman seizures and efficacy of atropine...us.army.mil Taylor P (2001) Anticholinesterase agents, in Goodman and Gilman’s The Pharrna-
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Enrique Baca-García
2007-06-01
Full Text Available Background and objectives: Lungwort infusion is a preparation extracted from Pulmonaria officinalis which is occasionally used as a folk remedy for the common cold. The current report aims to describe acute atropine intoxications with delirium caused by Lungwort infusion in several members of the same family. Methods: Description of three case reports. Search of literature through Medline. Results: Three generations of a same family presented acute and moderately severe atropine intoxications after drinking an infusion prepared with Pulmonaria officinalis. Conclusions: Despite the lack of scientific evidence for its clinical use, medicinal plants continue being widely used. In spite of severe adverse effects reported, the general thought is that herbal remedies are harmless. To our knowledge, this is the first report of acute atropine intoxications with psychiatric symptoms secondary to Pulmonaria officinalis in several members of a family. We suspect that the lungwort infusion may have been contaminated with some other substance with atropinic properties.
Neonatal mydriasis due to effects of atropine used for maternal Tik-20 poisoning.
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Shah A
1995-01-01
Full Text Available A neonate was born to a mother who had consumed an organophosphorus(OPC compound with suicidal intent. The mother was administered atropine and this caused mydriasis in the neonate without any other pharmacological effects. There was no evidence of placental dysfunction. There are no case reports of OPC consumed in pregnancy and its effect on neonates or of effects of massive doses of atropine in the mother and its effects on the fetus or the newborn.
Sodium cromoglycate and atropine block the fall in FEV1 but not the cough induced by hypotonic mist.
Fuller, R W; Collier, J G
1984-01-01
In a group of patients with mild asthma the inhalation of mist derived from ultrasonically nebulised distilled water caused an increase in cough and a fall in FEV1. Double blind administration for five minutes of sodium cromoglycate (from an original solution containing 30 mg/ml) or atropine (2 mg/ml) by inhalation from a Minineb nebuliser, 30 minutes before the mist challenge, caused a significant reduction in the fall in FEV1 (p less than 0.05), but not in cough, by comparison with the protection afforded by placebo (saline). In a second study the fall in FEV1 caused by the inhalation of distilled water was not significantly different from that seen in response to hypotonic sodium chloride (1.7 g/l, 58 mmol/l), but both produced a significantly greater fall than did a similar mist containing sodium cromoglycate at an original concentration of 10 mg/ml (58 mmol/l). The results show that both atropine and sodium cromoglycate can block the fall in FEV1 due to mist and that protection by sodium cromoglycate is immediate. These results suggest that sodium cromoglycate blocks the nervous reflexes concerned in the response to mist, probably in the afferent limb of the reflex. PMID:6437001
Preparation and Evaluation of Veterinary 0.1% Injectable Solution of Atropine Sulphate
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F K Mohammad
2012-06-01
Full Text Available This study introduces the know-how of preparing a multiple injection form atropine sulphate solution. An injectable aqueous solution of atropine sulphate at a concentration of 0.1%. was prepared under aseptic conditions in dark glass bottles each containing 50 ml. The preparation was intended for animal use only. It contained 1g atropine sulphate, 9 g sodium chloride as a normal saline, benzyl alcohol 15 ml as a preservative and water for injection up to 1000 ml. The pH of the solution was adjusted to 4.2 (range 3.0-6.5. The preparation of 0.1% atropine sulphate solution was clear colorless solution free from undesired particles. It complied with the requirements for injectable solutions. Further, the preparation was safe when used under laboratory conditions in chicks, rats and donkeys. It was also effective in preventing dichlorvos (an organophosphate insecticide-induced poisoning in chicks in a manner comparable to a commercial preparation of 0.1% atropine sulphate. In conclusion, the know-how of a preparation of 0.1% atropine sulphate solution is presented for veterinary use. [Vet. World 2012; 5(3.000: 145-149
Gehlen, Heidrun; Marnette, Silke; Rohn, Karl; Stadler, Peter
2006-01-01
The purpose of this study was to determine whether the combination of dobutamine and atropine causes cardiac stress equivalent to treadmill exercise. Therefore, electrocardiography and echocardiography were performed on 10 warmblood horses before, during, and after different cardiac stress tests. Stressors consisted of a standardized treadmill exercise and combined administration of dobutamine (7.5 microg/kg/min) and atropine (5 microg/kg). Maxima heart rates were achieved during the treadmill exercise (175 +/- 10 bpm). After exercise, a rapid decrease in heart rate was observed. Subsequently, a stress echocardiography for which a heart rate >100 bpm was required could only be performed within 1 minute after exercise. The mean heart rate during echocardiography was 136 +/- 8 bpm after exercise. The combination of dobutamine and atropine also resulted in a significant increase in heart rate, up to 141 +/- 20 bpm. Maxima heart rate was significantly higher during the treadmill exercise, but the decrease in heart rate was significantly slower after dobutamine and atropine administration. Over a period of 7.9 minutes, the mean heart rate was 123 +/- 8 bpm during dobutamine and atropine administration. Consequently, the combination of both drugs offered sufficient time for detailed examinations. Overall, echocardiographic examination identified a decrease in left ventricular (LV) dimensions, an increase in LV wall thickness, and a decrease in stroke volume after the treadmill exercise and during pharmacologic stress testing compared with baseline. Changes in echocardiographic variables generally were more pronounced during dobutamine and atropine administration. Similar to stress echocardiography in humans, in horses the combination of dobutamine and atropine is useful to produce an increase in heart rate comparable with what is achieved with exercise but without the need of increasing dobutamine dosage.
The Effect of Atropine on Post-ECT Bradycardia in Patients with Major Depressive Disorder
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Hassan Farashbandi
2014-08-01
Full Text Available Background: Electroconvulsive therapy (ECT is utilized for treatment of a range of psychiatric disorders including major depressive disorder (MDD. One of the major complications in using ECT is cardiovascular problems i.e., bradycardia. The present study was designed to investigate the effect of atropine on the pulse rate (PR of the patients under treatment with ECT. Materials and Methods: In this randomized clinical trial, 30 patients with diagnosis of MDD who received atropine before ECT treatment (control group were compared with 30 patients with the same diagnosis without receiving atropine (experimental group under ECT treatment. Both groups received ECT under the same term and condition. The PR of the patients were recorded 7 times (twice before anesthesia and ECT and 5 fixed one min intervals immediately after receiving ECT; for 10 sessions of treatment with ECT (3 times a week. The results were analyzed using repeated measure analysis of variance. The PR under 50 was the cut off point for differentiating the patients suffering from bradycardia and those without it. Results: Slight increment in PRs for experimental group (patient who did not receive atropine in contrast to control group were observed, but it did not reach a statistically significant level. The gender (male/female did not have different PR. The age of the patients and initial PR (regarded as co-variances did not show significant effect on PR for total sample. Conclusion: There seems to be not necessary to use atropine treatment for depressed patients receiving ECT.
Construction and analytical application of ion-selective piezoelectric sensor for atropine sulfate.
Long, Y; Lei, L; Li, W; He, D; Nie, L; Yao, S
1999-11-01
The method describes the use of a piezoelectric quartz crystal (PQC) as a substitute for ion-selective electrodes. The approach is feasible when the membrane materials are electrically non-conductive and membrane potential measurements are consequently not possible. An ion-selective piezoelectric sensor sensitive to atropine sulfate was constructed by coating a PVC membrane containing activant on one the side of a PQC. On the basis of selective adsorption of atropine ions across the modified film and the sensitive mass response of PQC, the method exhibits a sensitive, rapid response and is easy to operate without pretreatment of the sample. The logarithm of the frequency shift gave a linear relationship with the logarithm of atropine sulfate concentration in the 1.0 x 10(-8)-1.0 x 10(-3) M range with a detection limit of 5.0 x 10(-9) M at pH 7.0. Recoveries were from 98.7-102.2%. Two activants, atropine tetraphenylborate and atropine dipicrylaminate, were synthesized and investigated. Influencing factors were also examined and optimized. The results for real samples obtained by the proposed method agreed with those obtained by conventional methods.
Dan Nang Xue blockade with Innovar and Atropine to prevent internal organpull response
Institute of Scientific and Technical Information of China (English)
Yu Chuan Liu; Qi Sheng Liang; Yun Chun Zhang; Xue Wu Ling
2000-01-01
AIM To observe the effects of Innovar and Atropine on Visceral pull response.METHODS Patients were randomly divided into two groups. The experimental group was treated by DanNang Xue blockade with Innovar 4 mL and Atropine 0.5 mg (n = 40) and the control group was treated byabdominal vagus blockade with 10 mL of 10 g/L Lidocaine (n = 40). Dan Nang Xue was chosen for insertionof No 5 needle (5 cm in length) after local sterilization. The acupoint of Dan Nang Xue is located at theoutside of knee-jont and it is one-finger wider below Yanglingquan can be found. A sensitive point. Theneedle was inserted between tibia and fibulae, lifted, thrusted and twirled until the patient felt ache. Innovarand Atropine were injected on Dan Nang Xue and the acupoint was gently messaged.RESULTS Patients in the experimental group remained quiet during operation. Neither nausea or vomitingnor uncomfortable reaction was complained, 85% of the patients belonged to grade m. Acupunctureenhanced the peristalsis of gallbladder and biliary secretions. Atropine relieved muscular spasm andprevented vomiting. A low heart rate was noted in the control during abdominal survey and gallbladder pull(P<0.05).CONCLUSION Dan Nang Xue blockade with innovar and atropine can prevent visceral pull response.
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Neya,Toshiaki
1985-02-01
Full Text Available Effects of noradrenaline (NA on the isolated rectal circular muscle of the cats were studied in comparison with the effects on the internal anal sphincter (IAS. NA (10(-8-10(-7 g/ml caused tonic contraction in four of 15 strips of the rectum taken from 15 animals, and in all 15 strips of the IAS. Phenylephrine also induced rectal and IAS contraction. Rectal contraction induced by NA was resistant to phentolamine, yohimbine, propranolol, hexamethonium and tetrodotoxin, but blocked by atropine. IAS contraction induced by NA was resistant to propranolol, atropine, hexamethonium and tetrodotoxin, but blocked by phentolamine and yohimbine. It is suggested that an atropine-sensitive excitatory adrenergic mechanism other than the excitatory alpha-adrenergic mechanism exists in the rectal circular muscle.
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Chaudhari L
1989-01-01
Full Text Available The use of atropine sulphate in the paediatric age group as a premedicant orally in a dosage of 0.02 mg/kg body weight 70 minutes prior to surgery was found to be as effective as atropine sulphate given intramuscularly 35 minutes prior to surgery in a dosage of 0.01 mg/kg body weight. This avoids the unpleasant memory of needle prick; The duration of effect as studied in the normal healthy children not subjected to surgery was found to be 2 1/2-3 hours.
Determination of atropine using Mn-doped ZnS quantum dots as novel luminescent sensitizers
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Azizi, Seyed Naser [Analytical Division, Faculty of Chemistry, University of Mazandaran, Babolsar 4741695447 (Iran, Islamic Republic of); Chaichi, Mohammad Javad, E-mail: jchaichi@yahoo.com [Analytical Division, Faculty of Chemistry, University of Mazandaran, Babolsar 4741695447 (Iran, Islamic Republic of); Shakeri, Parmis [Analytical Division, Faculty of Chemistry, University of Mazandaran, Babolsar 4741695447 (Iran, Islamic Republic of); Bekhradnia, Ahmadreza [Pharmaceutical Sciences Research Center, Department of Medicinal Chemistry, Mazandaran University of Medical Sciences, Sari (Iran, Islamic Republic of)
2013-12-15
A novel chemiluminescence (CL) method using water-soluble Mn-doped ZnS quantum dots (QDs) as sensitizers is proposed for the chemiluminometric determination of atropine in pharmaceutical formulation. Water-soluble Mn-doped ZnS QDs were synthesized by using L-cysteine as stabilizer in aqueous solutions. The nanoparticles were structurally and optically characterized by X-ray powder diffraction (XRD), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), UV–vis absorption spectroscopy and photoluminescence (PL) emission spectroscopy. It was found that ZnS quantum dots acted as enhancers of the weak CL emission produced upon oxidation of sulfite by Ce(IV) in acidic medium. Trace amounts of atropine improved the sensitize effect of ZnS quantum dots yielding a significant chemiluminescence enhancement of the Ce(IV)–SO{sub 3}{sup 2−}–ZnS QD system. Therefore, a new CL analysis system was developed for the determination of atropine. Under the optimum conditions, there is a good linear relationship between the relative chemiluminescence intensity and the concentration of atropine in the range of 1×10{sup −9}–1×10{sup −6} M of atropine with a correlation coefficient (R{sup 2}) of 0.9992. The limit of detection of this system was found to be 2.54×10{sup −10} M. This method is not only simple, sensitive and low cost, but also reliable for practical applications. -- Highlights: • Mn-doped ZnS quantum dots could enhance the chemiluminescence (CL) of cerium(IV)–sodium sulfite system. • ZnS quantum dots were used as the nanocatalyst. • Trace amounts of atropine improved the sensitize effect of ZnS quantum dots. • This work is introduced as a new method for the determination of atropine commercial drugs. • Detection limit of atropine was obtained 2.54×10{sup −10} mol L{sup −1}.
Efficacy of atropine combined with paroxetine in vagus nerve excitatory panic disorder
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Du N
2015-07-01
Full Text Available Na Du, Xue-Li Sun Department of Psychiatry, West China Hospital, Sichuan University, Chengdu, People’s Republic of China Abstract: Panic disorder is often associated with the autonomic nervous system pattern – sympathetic activation and parasympathetic (vagal withdrawal. However, we present one special case here to show a totally reversed pathogenesis – vagal activation occupying the leading role, which requires atropine to cure the patient’s symptoms. Through this report, it is reasonably proven that panic disorder may be a heterogeneous condition, whose mechanism might be the imbalance between the sympathetic and parasympathetic tone. Keywords: panic disorder, vagal activation, bradycardia, atropine
A Double-Blind Atropine Trial for Active Learning of Autonomic Function
Fry, Jeffrey R.; Burr, Steven A.
2011-01-01
Here, we describe a human physiology laboratory class measuring changes in autonomic function over time in response to atropine. Students use themselves as subjects, generating ownership and self-interest in the learning as well as directly experiencing the active link between physiology and pharmacology in people. The class is designed to…
[Research on whether atropine can be substituted by the powerful cycloplegic cyclopentolate].
Xu, Jiang-tao
2012-09-01
For a long time, atropine eye ointment has been widely used as the cycloplegic for children's optometry in China, while internationally, cyclopentolate gutta is widely used as the first choice for cycloplegic. In recent years, 1% cyclopentolate hydrochloride ocular humor has been introduced to our country. This effective and powerful cycloplegic has already been paid close attention to by domestic pedo-ophthalmologists. According to a serious of studies both home and abroad on the therapeutic effects of the own control drugs, the cycloplegia effect of cyclopentolate is close to the atropine. Cyclopentolate can be widely used for the cycloplegia before optometry for the Chinese children. However, the effect of cyclopentolate is still not as good as atropine. So, for the children with farsightedness within 7 years old, all esotropia children, Am children, and children who suffer from decreased vision acuteness and needs to be excluded from accommodative myopia, atropine eye ointment should be routinely used for cycloplegia before optometry. In this article, we also discuss the medication dosage, medication method, possible drug adverse reactions of cyclopentolate humor ocular and the coping measures at the same time.
Poterman, Marieke; Scheeren, Thomas; van der Velde, M.I.; Struys, Michel; Kalmar, A.F.
2013-01-01
Background and Goal of Study: Induction of anaesthesia with propofol and remifentanil often induces unwanted bradycardia and hypotension. This raises the concern for preserving haemodynamic stability and adequate tissue oxygenation. We previously demonstrated that atropine significantly improves h
Atropine increases the positive adrenergic effects of norepinephrine : A pilot study.
Kalmar, A.F.; Weening, Mariska; Struys, Michel; Scheeren, Thomas
2012-01-01
Background and Goal of Study: Atropine is a competitive antagonist of cholinergic receptors and is widely used to blunt the increased vagal tone that is often caused by surgical manipulations. It increases heart rate(HR) with minimal effects on mean arterial pressure(MAP) and cardiac output(CO). Nor
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Smith, E.L.; Redburn, D.A.; Harwerth, R.S.; Maguire, G.W.
1984-02-01
Chronic mydriasis was induced in six kittens (four monocular, two binocular) and two adult cats (both monocular) by the daily topical application of atropine. Both the kittens and the adult cats were atropinized for a 13-week period with the treatment regimen beginning at the time of eye opening for the kittens. Pupil size measurements, obtained 1 year after the atropinization were discontinued, revealed that, although the pupils of the adult cats were normal, the pupils of the kittens' treated eyes were consistently smaller than pupils in control eyes. The status of the muscarinic receptors in the kittens' irides was investigated using /sup 3/H-QNB binding assays. In comparison with iris muscle homogenates from the control eyes, those from the treated eyes demonstrated an eightfold increase in the number of receptor binding sites. The results indicate that pupil size can be altered permanently by chronic mydriasis initiated early in the life of a kitten and that the permanent change in pupil size may result, in part, from a type of permanent supersensitivity response in the muscle following chronic blockade of muscarinic transmission by atropine.
Dose-response effects of atropine and HI-6 treatment of organophosphorus poisoning in guinea pigs
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Koplovitz, I.; Menton, R.; Matthews, C.; Shutz, M.; Nalls, C.
1995-12-31
H1-6 (1-2-hydrnxyiminomethyl-1 pyridino-3-(4-carbameyl- 1--pyddino)-2- oxaprnpane dichioride) has been evaluated as an oxime alternative to pralidoxime, and toxogonin in the treatment of organophosphorus (OP) poisoning. The dose response effects of atropine (ATR) and HI-6 were investigated to more fully explore the interaction of these compounds in the treatment of OP poisoning. ATR, HI-6 and various combinations of the two drugs were evaluated against lethal poisoning by soman (GD) and tabun (GA) in guinea pigs. The effect of adjunctive diazepam treatment on the efficacy of atropine and HI-6 against soman was also investigated. Animals of either sex were challenged s.c. with OP and treated i.m. 1 min later with ATR and/or HI-6. When used, diazepam was injected immediately after ATR+HI6. LD50s of each treatment were calculated from probit models based on 24-hour survival against 5 levels of nerve agent and 6 animals per challenge level. A protective index (PI) was calculated by dividing the nerve agent LD50 in the presence of treatment by the LD50 in the absence of treatment. Treatment with HI-6 alone had little effect on the toxicity of either OP. Treatment with ATR alone was more effective than HI-6 alone and was significantly more effective against soman than against tabun. When used in combination atropine and HI-6 had a strong synergistic effect against both agents. The dose of atropine used with HI-6 was critical in determining the efficacy of HI-6 against either agent. The slopes of the dose-lethality curves were minimally affected by the dose of ATR or HI-6. Adjunctive treatment with diazepam enhanced the efficacy of HI-6 and atropine against soman.
MRI findings in 6 cases of children by inadvertent ingestion of diphenoxylate-atropine
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Xiao Lianxiang [Shandong University School of Medicine, Shandong Medical Imaging Research Institute , No. 44 West Wenhua Road, Jinan 250012 (China); Lin Xiangtao, E-mail: yishui1982@126.com [Shandong University School of Medicine, Shandong Medical Imaging Research Institute, No. 44 West Wenhua Road, Jinan 250012 (China); Cao Jinfeng [Shandong University School of Medicine, Shandong Medical Imaging Research Institute , No. 44 West Wenhua Road, Jinan 250012 (China); Wang Xueyu [Division of Pediatrics, Shandong Provincial Hospital, Shandong University, No. 324 Jingwu Road, Jinan 250021 (China); Wu Lebin [Shandong Medical Imaging Research Institute, No. 324 Jingwu Road, Jinan 250021 (China)
2011-09-15
Purpose: Compound diphenoxylate (diphenoxylate-atropine) poisoning can cause toxic encephalopathy in children, and magnetic resonance imaging (MRI) of the brain in this condition has not been reported. This study is to analyze brain MRI findings and to investigate the relations between MRI features and possible pathophysiological changes in children. Methods: Six children accidentally swallowed compound diphenoxylate, 4 males, 2 females, aged 20-46 months, average 33 months. Quantity of ingested diphenoxylate-atropine was from 6 to 30 tablets, each tablet contains diphenoxylate 2.5 mg and atropine 0.025 mg. These patients were referred to our hospital within 24 h after diphenoxylate-atropine ingestion, and underwent brain MRI scan within 24-72 h after emergency treatment. The characteristics of conventional MRI were analyzed. Results: These pediatric patients had various symptoms of opioid intoxication and atropine toxicity. Brain MRI showed abnormal low signal intensity on T1-weighted images (T1WI) and abnormal high signal intensity on T2-weighted images (T2WI) and fluid-attenuated inversion recovery (FLAIR) imaging in bilateral in all cases; abnormal high signal intensity on T1WI, T2WI and FLAIR in 4 cases. Encephalomalacia was observed in 3 cases during follow-up. Conclusion: In the early stage of compound diphenoxylate poisoning in children, multiple extensive edema-necrosis and hemorrhagic-necrosis focus were observed in basic nucleus, pallium and cerebellum, these resulted in the corresponding brain dysfunction with encephalomalacia. MRI scan in the early stage in this condition may provide evidences of brain impairment, and is beneficial for the early diagnosis, treatment and prognosis assessment.
Mukherjee, Jhindan; Wong, Pamela T; Tang, Shengzhuang; Gam, Kristina; Coulter, Alexa; Baker, James R; Choi, Seok Ki
2015-12-01
Despite extensive studies on drug delivery using multivalent complexation systems, the biophysical basis for release kinetics remains poorly defined. The present study addresses this aspect involved in the complexation of a fifth generation poly(amidoamine) (PAMAM) dendrimer with atropine, an essential antidote used for treating organophosphate poisoning. First, we designed (1)H NMR titration studies for determining the molecular basis of the drug complexation with a glutarate-modified anionic dendrimer. These provide evidence pointing to a combination of electrostatic and hydrophobic interactions as the driving forces for dendrimer complexation with the alkaloid drug molecule. Second, using LC-MS/MS spectrometry, we determined the dissociation constants (KD) at steady state and also measured the drug release kinetics of atropine complexes with four negatively charged dendrimer types. Each of these dendrimers has a high payload capacity for up to ∼ 100 atropine molecules. However, the affinity of the atropine to the carrier was highly dependent on the drug to dendrimer ratio. Thus, a complex made at a lower loading ratio (≤ 0.1) displayed greater atropine affinity (KD ≈ μM) than other complexes prepared at higher ratios (>10), which showed only mM affinity. This negative cooperative variation in affinity is tightly associated with the nonlinear release kinetics observed for each complex in which drug release occurs more slowly at the later time phase at a lower loading ratio. In summary, the present study provides novel insights on the cooperativity as the mechanistic basis for nonlinear release kinetics observed in multivalent carrier systems.
A comparison of the effects of atropine on real-feeding and sham-feeding of sucrose in rats.
Nissenbaum, J W; Sclafani, A
1988-02-01
In Experiment 1 the influence of atropine methyl nitrate on the sham-feeding response of adult female rats to a sucrose solution was determined. Atropine (1 or 5 mg/kg) reliably suppressed the sham-intake of sucrose when the drug was administered 30 or 0 min prior to, or 17 min after the start of the feeding session. The suppressive effect was less, however, when the drug was administered 30 min before testing compared to the other two injection-test conditions. In Experiment 2 atropine failed to reliably decrease the real-feeding of a sucrose solution whether it was injected 30, 15, or 0 min prior to testing. These results were replicated in Experiment 3; atropine (0 min injection-test interval) reduced the sham-intake but not the real-intake of a sucrose solution. However, atropine decreased the rate of feeding under both real- and sham-feeding conditions. The fact that atropine reduced feeding rate but not meal size in the real-feeding condition was attributed to the drug's lack of effect on postingestive satiety. The present findings along with other recent results indicate that (1) the injection-test interval is a potentially important variable in studies involving atropine; (2) results obtained with sham-feeding animals do not always generalize to real-feeding animals; and (3) cholinergically-mediated cephalic responses are of questionable importance in the control of meal size.
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Weitzel Luis H
2006-07-01
Full Text Available Abstract Background To study the effects of Beta-blockers during Dobutamine Stress Echocardiography (DSE comparing the hemodynamic benefits of an early administration of atropine in patients taking or not Beta-blockers. Methods One hundred and twenty-one patients were submitted to dobutamine stress echocardiography for the investigation of myocardial ischemia. The administration of atropine was randomized into two groups: A or B (early protocol when atropine was administered at 10 and 20 mcg/kg/min of dobutamine, respectively and C (standard protocol with atropine at 40 mcg/kg/min of dobutamine. Analysis of the effects of Beta-blockers was done regarding the behavior pattern of heart rate and blood pressure, test time, number of conclusive and inconclusive (negative sub-maximum test results, total doses of atropine and dobutamine, and general complications. Results Beta-blocked patients who received early atropine (Group A&B had a significantly lower double product (p = 0.008, a higher mean test time (p = 0.010 and required a higher dose of atropine (p = 0.0005 when compared to the patients in this group who were not Beta-blocked. The same findings occurred in the standard protocol (Group C, however the early administration of atropine reduced test time both in the presence and absence of this therapy (p = 0.0001. The patients with Beta-blockers in Group A&B had a lower rate of inconclusive tests (26% compared to those in Group C (40%. Complications were similar in both groups. Conclusion The chronotropic response during dobutamine stress echocardiography was significantly reduced with the use of Beta-blockers. The early administration of atropine optimized the hemodynamic response, reduced test time in patients with or without Beta-blockers and reduced the number of inconclusive tests in the early protocol.
Dose-response effects of atropine and HI-6 treatment of organophosphorus poisoning in guinea pigs.
Koplovitz, I; Menton, R; Matthews, C; Shutz, M; Nalls, C; Kelly, S
1995-01-01
HI-6 (1-2-hydroxyiminomethyl-1-pyridino-3-(4-carbamoyl-1-pyridino -2- oxapropane dichloride) has been evaluated as an oxime alternative to pralidoxime, and toxogonin in the treatment of organophosphorus (OP) poisoning. The dose response effects of atropine (ATR) and HI-6 were investigated to more fully explore the interaction of these compounds in the treatment of OP poisoning. ATR, HI-6 and various combinations of the two drugs were evaluated against lethal poisoning by soman (GD) and tabun (GA) in guinea pigs. The effect of adjunctive diazepam treatment on the efficacy of atropine and HI-6 against soman was also investigated. Animals of either sex were challenged s.c. with OP and treated i.m. 1 min later with ATR and/or HI-6. When used, diazepam was injected immediately after ATR+HI6. LD50s of each treatment were calculated from probit models based on 24-hour survival against 5 levels of nerve agent and 6 animals per challenge level. A protective index (PI) was calculated by dividing the nerve agent LD50 in the presence of treatment by the LD50 in the absence of treatment. Treatment with HI6 alone had little effect on the toxicity of either OP. Treatment with ATR alone was more effective than HI-6 alone and was significantly more effective against soman than against tabun. When used in combination atropine and HI-6 had a strong synergistic effect against both agents. The dose of atropine used with HI-6 was critical in determining the efficacy of HI-6 against either agent. The slopes of the dose-lethality curves were minimally affected by the dose of ATR or HI-6. Adjunctive treatment with diazepam enhanced the efficacy of HI-6 and atropine against soman. It is concluded that 1) ATR has a large effect on the efficacy of HI-6 against OP poisoning, 2) the dose of ATR must be carefully selected in studies investigating the efficacy of HI-6 against OP poisoning, 3) the effective dose of ATR in the guinea pig is approximately 16 mg/kg, and 4) diazepam is a useful
Sandersen, Charlotte F; Detilleux, Johanne; de Moffarts, Brieuc; Van Loon, Gunther; Amory, Hélène
2006-01-01
The aim of this study was to investigate the effect of combined atropine low-dose dobutamine stress test on left ventricular parameters in adult warmblood horses, to establish a potential protocol for pharmacological stress echocardiography. Seven healthy untrained warmblood horses aged 9 to 22 years were used. Heart rate (HR) and left ventricular B- and M-mode dimensions were recorded at baseline and during stress testing with 35 microg/kg atropine IV followed by incremental dobutamine infusion of 2 to 6 microg/kg/min. HR increased significantly (P stress test induced significant changes in left ventricular echocardiographic parameters in adult warmblood horses. Additional research should evaluate the value of this stress test in horses suffering from cardiac disease.
Evaluation of Atropine-Xylazine as a Sedative in Buffalo Calves (Bubalus bubalis
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S. Singh
2010-02-01
Full Text Available Twelve experimental trials were undertaken on clinically healthy male buffalo calves. Atropine was administered @ 0.04 mg/kg, IM and xylazine was administered @ 0.04 mg/kg, IM. Following atropine-xylazine administration, a decrease in spontaneous activity was seen in all the animals. Lowering of head was observed in three animals. Haemoglobin reduced significantly at 15 minute after xylazine administration. A significant reduction in mean arterial pressure (MAP was also seen at 30 and 45 minute after xylazine administration. The pulse pressure increased significantly after 5 minute of xylazine administration. The central venous pressure (CVP increased significantly at 30 minute and 45 minute of xylazine administration.
The Effects of Anticholinesterases and Atropine Derivatives on Visual Function in Human Subjects
1988-02-01
frequency was also measured as the mean of 3 readings obtained with the Visual Function Tester of Genco and Task (1984), which was on loan from the US Air...and physostigmine eyedrops. Experimental Eye Research 20, 15-21. Genco ,L.V. and Task, H.L. (1984). Testing changes in visual function due to orbital
1983-05-01
P., Kemp, K. & Wetherell, A. Some effects of 2mg i.m. atropine and 5mg i.m. diazepam , separately and combined, on human performance. Proc. Brit...Impaired coordination 0 1 2 3 4 Tense 0 1 2 3 4 Restless 0 1 2 3 4 Depressed 0 1 2 3 4 Anxious 0 1 2 3 4 Fatigued 0 1 2 3 4 Unable to concentrate 0 1 2 3 4
DEFF Research Database (Denmark)
Abelson, Klas S P; Höglund, A Urban
2002-01-01
muscarinic agonists and antagonists modify nociceptive threshold by affecting intraspinal release of acetylcholine (ACh). Catheters were inserted into the femoral vein in rats maintained on isoflurane anaesthesia for administration of oxotremorine (10-300 microg/kg) and atropine (0.1, 10, 5000 microg....../kg). Spinal microdialysis probes were placed intraspinally at approximately the C2-C5 spinal level for sampling of acetylcholine and dialysis delivery of atropine (0.1, 1, 10 nM). Additionally, the tail-flick behaviour was tested on conscious rats injected intraperitoneally with saline, atropine (10, 100....... Intravenously administered atropine, in a dose that produced hyperalgesia (5000 microg/kg) in the tail-flick test, significantly decreased the intraspinal release of acetylcholine. Our results suggest an association between pain threshold and acetylcholine release in spinal cord. It is also suggested...
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Huang Yun, E-mail: hy9317536@126.com [Pharmaceutical College, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang City, Hebei Province 050017 (China); Cui Lijian [Traditional Chinese Medical College, Hebei Medical University, Shijiazhuang 050091 (China); Wang Jianming; Huo Kun; Chen Chen; Zhan Wenhong; Wang Yongli [Pharmaceutical College, Hebei Medical University, 361 Zhongshan East Road, Shijiazhuang City, Hebei Province 050017 (China)
2012-02-15
The interaction of aconitine with bovine serum albumin (BSA) and effect of atropine sulphate and glycyrrhizic acid on binding constant, binding sites, and conformation were studied in an aqueous buffer solution (pH 7.40) by ultraviolet absorption and fluorescence spectroscopy. The study results show that aconitine quenched the endogenous fluorescence of BSA via a dynamic quenching procedure. Predominant intermolecular forces between aconitine and BSA were hydrophobic interactions, which stabilized the complex of aconitine-BSA. The distance between the donor and acceptor was 2.62 nm. The conformation of BSA was investigated by synchronous fluorescence techniques, indicating that the microenvironment around tryptophan (Trp) residues was changed. Furthermore, with the addition of atropine sulphate or glycyrrhizic acid, binding constant and the number of binding sites of aconitine to BSA were decreased, and the conformation had no change, which provide an important theoretical support for aconitine detoxification by atropine sulphate and glycyrrhizic acid. - Highlights: Black-Right-Pointing-Pointer Effect of atropine or glycyrrhizic acid on aconitine-BSA binding. Black-Right-Pointing-Pointer UV-vis absorption and fluorescence spectroscopic techniques used. Black-Right-Pointing-Pointer Aconitine quenched BSA fluorescence via dynamic quenching with r=2.62 nm. Black-Right-Pointing-Pointer Atropine sulphate and glycyrrhizic acid decreased K{sub A} and n of aconitine-BSA. Black-Right-Pointing-Pointer Support for aconitine detoxification by atropine and glycyrrhizic acid.
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Chaurasia S
1999-07-01
Full Text Available Sixty patients in the age group of 18-60 years of A.S.A. Grade I/II risk, scheduled for elective orthopaedic surgeries under general anaesthesia were studied for pre-medication with either oral clonidine or with combination of effects of diazepam & atropine. Patients in Group A (clonidine group received tablet clonidine 100 mcg (1 tablet if less than 50 kg in weight and 200 mcg if weighing more than 50 kg two hours before surgery. Patients in Group B (Diazepam-atropine group received one tablet of Diazepam (10 mg orally two hours before surgery and injection atropine-sulphate 0.01 mg/kg half an hour preoperatively by intramuscular route. In our study, the sedative and anti-sialogogue effects of clonidine were comparable to those of diazepam-atropine combination, which are commonly used premedicants. The anti-anxiety effect of clonidine was found to be better than that of diazepam-atropine combination. Clonidine also proved to be a better agent for the attenuation of pressor response to laryngoscopy and intubation. Thus, oral clonidine is a better premedicant compared to atropine-diazepam combination. Also, it is a more acceptable agent because of its oral route of administration.
Sánchez-Fortún, S; Barahona, V
2001-09-01
The acute toxicity of carbophenothion to three age classes of Artemia salina was evaluated. An increase in toxicity of carbophenothion was found following longer development of A. salina. The effect of pretreatment with the nonselective muscarinic antagonist atropine, the two reversible acetylcholinesterase-inhibitors physostigmine and pyridostigmine, and the cholinesterase-reactivating oxime 2-pyridine aldoxime methochloride (2-PAM) on carbophenothion-induced lethality in 24-h-old A. salina was also investigated. The lethal action of carbophenothion was completely prevented by pretreatment of A. salina with 2-PAM. Atropine and pyridostigmine afforded a maximal protection of approximately 87% and 72%, respectively, compared to control values. In contrast, physostigmine was ineffective. The inhibitory effects of combinations of 10(-5) M atropine with physostigmine, pyridostigmine, or 2-PAM were greater than those elicited by either drug alone, with the maximum protection afforded being 92.58%, 100%, and 100%, respectively. In the presence of 10(-7) M atropine, neither pyridostigmine nor 2-PAM provided additional inhibition of the lethality compared to that with either drug alone, whereas the protection afforded by 10(-7) M atropine plus physostigmine increased as the concentration of carbamate increased (up to 10(-3) M). Pretreatment with pyridostigmine or physostigmine plus 2-PAM (10(-6) M) slightly enhanced the maximal inhibition of carbophenothion lethality compared to that with either drug alone. It is suggested that the most active combined pretreatment studied here was physostigmine plus atropine.
Perera, P M S; Shahmy, S; Gawarammana, I; Dawson, A H
2008-06-01
There is a wide variation and lack of evidence in current recommendations for atropine dosing schedules leading to subsequent variation in clinical practice. Therefore, we sought to examine the safety and effectiveness of a titrated vs. ad hoc atropine treatment regimen in a cohort of patients with acute cholinesterase inhibitor pesticide poisoning. A prospective cohort study was conducted in three district secondary referral hospitals in Sri Lanka using a structured data collection form that collected details of clinical symptoms and outcomes of cholinesterase inhibitor pesticide poisoning, atropine doses, and signs of atropinization. We compared two hospitals that used a titrated dosing protocol based on a structured monitoring sheet for atropine infusion with another hospital using an ad hoc regime. During the study, 272 symptomatic patients with anticholinesterase poisoning requiring atropine were admitted to the three hospitals. Outcomes of death and ventilation were analyzed for all patients, 226 patients were prospectively assessed for atropine toxicity. At baseline, patients in the titrated dose cohort had clinical signs consistent with greater toxicity. This in part may be due to ingestion of more toxic organophosphates. They received less pralidoxime and atropine, and were less likely to develop features of atropine toxicity, such as delirium (1% vs. 17%), hallucinations (1% vs. 35%), or either (1% vs. 35%) and need for patient restraint (3% vs. 48%) compared with the ad hoc dose regime. After adjusting for the pesticides ingested, there was no difference in mortality and ventilatory rates between protocols. Ad hoc high dose atropine regimens are associated with more frequent atropine toxicity without any obvious improvement in patient outcome compared with doses titrated to clinical effect. Atropine doses should be titrated against response and toxicity. Further education and the use of a structured monitoring sheet may assist in more appropriate
Atropine and ODQ antagonize tetanic fade induced by L-arginine in cats
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J.M. Cruciol-Souza
1999-10-01
Full Text Available Although it has been demonstrated that nitric oxide (NO released from sodium nitrite induces tetanic fade in the cat neuromuscular preparations, the effect of L-arginine on tetanic fade and its origin induced by NO have not been studied in these preparations. Furthermore, atropine reduces tetanic fade induced by several cholinergic and anticholinergic drugs in these preparations, whose mechanism is suggested to be mediated by the interaction of acetylcholine with inhibitory presynaptic muscarinic receptors. The present study was conducted in cats to determine the effects of L-arginine alone or after pretreatment with atropine or 1H-[1,2,4]oxadiazole [4,3-a]quinoxalin-1-one (ODQ on neuromuscular preparations indirectly stimulated at high frequency. Drugs were injected into the middle genicular artery. L-arginine (2 mg/kg and S-nitroso-N-acetylpenicillamine (SNAP; 16 µg/kg induced tetanic fade. The Nw-nitro-L-arginine (L-NOARG; 2 mg/kg alone did not produce any effect, but reduced the tetanic fade induced by L-arginine. D-arginine (2 mg/kg did not induce changes in tetanic fade. The tetanic fade induced by L-arginine or SNAP was reduced by previous injection of atropine (1.0 µg/kg or ODQ (15 µg/kg. ODQ alone did not change tetanic fade. The data suggest that the NO-synthase-GC pathway participates in the L-arginine-induced tetanic fade in cat neuromuscular preparations. The tetanic fade induced by L-arginine probably depends on the action of NO at the presynaptic level. NO may stimulate guanylate cyclase increasing acetylcholine release and thereby stimulating presynaptic muscarinic receptors.
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Vučinić Slavica
2013-01-01
Full Text Available Introduction. Intermediate syndrome (IMS was described a few decades ago, however, there is still a controversy regarding its exact etiology, risk factors, diagnostic parameters and required therapy. Considering that acute poisonings are treated in different types of medical institutions this serious complication of organophosphate insecticide (OPI poisoning is frequently overlooked. The aim of this paper was to present a case of IMS in organophosphate poisoning, which, we believe, provides additional data on the use of oxime or atropine. Case report. After a well-resolved cholinergic crisis, the patient developed clinical presentation of IMS within the first 72 h from deliberate malathion ingestion. The signs of IMS were weakness of proximal limb muscles and muscles innervated by motor cranial nerves, followed by the weakness of respiratory muscles and serious respiratory insufficiency. Malathion and its active metabolite were confirmed by analytical procedure (liquid chromatography-mass spectrometry. Pralidoxime methylsulphate, adiministered as a continuous infusion until day 8 (total dose 38.4 g, and atropine until the day 10 (total dose 922 mg did not prevent the development of IMS, hence the mechanical ventilation that was stopped after 27 h had to be continued until the day 10. Conclusion. Continuous pralidoxime methylsulphate infusion with atropine did not prevent the development of IMS, most likely due to the delayed treatment and insufficient oxime dose but also because of chemical structure and lipophilicity of ingested OPI. A prolonged intensive care monitoring and respiratory care are the key management for the intermediate syndrome. [Projekat Ministarstva nauke Republike Srbije, br. OI 176018, No. 46009
... eye examinations to dilate (open) the pupil, the black part of the eye through which you see. ... hands thoroughly with soap and water. Use a mirror or have someone else apply the ointment. Avoid ...
Atropine-induced non-sustained polymorphic ventricular tachycardia: A rare case
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Mesut Aydın
2014-09-01
Full Text Available A 40 years old male with history of unexplained recurrent presyncope and palpitation episodes referred to cardiology department. Patient had no past medical history. Subsequently, electrophysiology study was performed to detect any underlying atrioventricular nodal disease or inducible tachyarrhythmias. During this period, 1.0 mg of atropine was injected intravenously to performed stimulation and patient suddenly developed polymorphic ventricular tachycardia that could not be terminated with overdrive pacing. Ventricular tachycardia was terminated spontaneously, two minutes later. J Clin Exp Invest 2014; 5 (3: 449-451
Atropine’s Effects upon the Heart and Its Systemic Output,
1986-01-01
efficiency in terms of oxygen utilization diminished from about 28% to 21%. At the same time as Gorlin and associates initially described the excess...studies of Gorlin and Scott’s groups represent the only attempts, to date, to define the metabolic cost to the heart due to atropine. Unfortunately, neither...toxicity and effectiveness in anticholines- terase therapy. J.A.M.A. 159:1181-1184, 1959. 121. GORLIN , R., M.H. SMITH, and H.P. FLETCHER. Studies on the
Victoria Barahona, M; Sánchez-Fortún, Sebastián
2007-01-01
The acute toxicity of fonofos and phosphamidon on three age classes of Artemia salina was evaluated. An increase in toxicity of these organophosphorous (OP) insecticides was found following longer development of A. salina. The effects of pretreatment with the nonselective muscarinic antagonist atropine, the two reversible acetylcholinesterease inhibitors physostigmine and pyridostigmine, and the cholinesterase-reactivating oxime 2-pyridine aldoxime methoiodide (2-PAM), as individual and combined pretreatments, on OP-induced lethality in 24 h Artemia were also investigated. The lethal action of both OP insecticides was prevented by pretreatment of 24 h Artemia with atropine and 2-PAM, while physostigmine proved ineffective against intoxication with both OP insecticides and pyridostigmine exhibited a low synergic effect. In both cases, the inhibitory effects of combinations of atropine (10(-5)M) plus 2-PAM were greater than those elicited by either drug alone, with the maximum protection afforded being 100%. Combined pretreatment of atropine (10(-5)M) plus physostigmine practically abolished the lethal effects induced by both insecticides. Pretreatment with 2-PAM (10(-6)M) plus physostigmine afforded maximal protection of 100% and 76% on the lethality induced by fonofos and phosphamidon, respectively. The data obtained suggest that the combination of atropine plus 2-PAM or physostigmine and the combined pretreatment of 2-PAM plus physostigmine are effective in the prevention of the lethal effects induced by fonofos and phosphamidon in A. salina larvae.
Barathi, Veluchamy A; Chaurasia, Shyam S; Poidinger, Michael; Koh, Siew Kwan; Tian, Dechao; Ho, Candice; Iuvone, P Michael; Beuerman, Roger W; Zhou, Lei
2014-11-07
Atropine, a muscarinic antagonist, is known to inhibit myopia progression in several animal models and humans. However, the mode of action is not established yet. In this study, we compared quantitative iTRAQ proteomic analysis in the retinas collected from control and lens-induced myopic (LIM) mouse eyes treated with atropine. The myopic group received a (-15D) spectacle lens over the right eye on postnatal day 10 with or without atropine eye drops starting on postnatal day 24. Axial length was measured by optical low coherence interferometry (OLCI), AC-Master, and refraction was measured by automated infrared photorefractor at postnatal 24, 38, and 52 days. Retinal tissue samples were pooled from six eyes for each group. The experiments were repeated twice, and technical replicates were also performed for liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. MetaCore was used to perform protein profiling for pathway analysis. We identified a total of 3882 unique proteins with retina proteome reported to date. Thirty proteins were found to be up-regulated (ratio for myopia/control > global mean ratio + 1 standard deviation), and 28 proteins were down-regulated (ratio for myopia/control retinas. Pathway analysis using MetaCore revealed regulation of γ-aminobutyric acid (GABA) levels in the myopic eyes. Detailed analysis of the quantitative proteomics data showed that the levels of GABA transporter 1 (GAT-1) were elevated in myopic retina and significantly reduced after atropine treatment. These results were further validated with immunohistochemistry and Western blot analysis. In conclusion, this study provides a comprehensive quantitative proteomic analysis of atropine-treated mouse retina and suggests the involvement of GABAergic signaling in the antimyopic effects of atropine in mouse eyes. The GABAergic transmission in the neural retina plays a pivotal role in the maintenance of axial eye growth in mammals.
Büget, Bahar; Türkmen, Aslı Zengin; Allahverdiyev, Oruc; Enginar, Nurhan
2016-01-01
This study evaluated the effects of different doses of atropine and new antiepileptics, levetiracetam and topiramate, on the development of convulsions triggered by food intake in antimuscarinic-treated fasted animals. Mice deprived of food for 24 h and treated i.p. with atropine at a dose of 2.4 or 24 mg/kg developed convulsions after being allowed to eat ad libitum. No convulsions were observed in fasted animals treated with 0.24 mg/kg atropine. There was no difference in the incidence of convulsions between the two atropine treatments, but latency to convulsions was longer in 24 mg/kg atropine treated animals. The lowest dose of atropine, 0.24 mg/kg, caused stage 1 and stage 2 activity, but did not provide the convulsive endpoint (stage 3, 4, 5 activity). Administration of levetiracetam (50 or 200 mg/kg) or topiramate (50 or 100 mg/kg) to another group of 24-h fasted mice was ineffective in reducing the incidence of convulsions developed in the animals after 2.4 mg/kg atropine treatment and food intake. However, the higher dose of levetiracetam prolonged the onset of convulsions. Present results demonstrated the efficacy of low and high doses of atropine on the development of convulsions in fasted animals and provided additional evidence for the ineffectiveness of antiepileptic treatment in these seizures.
Leaching of zinc compound from rubber stoppers into the contents of automatic atropine injectors.
Ellin, R I; Kaminskis, A; Zvirblis, P; Sultan, W E; Shutz, M B; Matthews, R
1985-07-01
This report describes how a material within the cartridge of an automatic injector contaminated its contents. On prolonged storage, a formulation that contained atropine produced lethality in mice. The toxic material originated from zinc compounds that were present in the rubber stopper and plunger of the container and that subsequently leached into the formulation. The contents of cartridges that contained greater than or equal to 0.75 mg/mL of solubilized zinc were lethal to at least 20% of the mice tested; those that contained 0.42 mg/mL showed no lethality. The problem resulted from the physicochemical properties of the rubber, not the concentration of zinc used in the vulcanization process.
J.M.P. Baptista da Silva (José); M. Arnese (Mariarosaria); J.R.T.C. Roelandt (Jos); P.M. Fioretti (Paolo); D.T.J. Keane (David); J. Escaned (Javier); C. di Mario (Carlo); P.W.J.C. Serruys (Patrick); H. Boersma (Eric)
1994-01-01
textabstractOBJECTIVES. The purpose of this study was to determine the predictive value of quantitative coronary angiography in the assessment of the functional significance of coronary stenosis as judged from the development of left ventricular wall motion abnormalities during dobutamine-atropine s
VANDENBROEK, L; PROOST, JH; WIERDA, JMKH; NJOO, MD; HENNIS, PJ
1994-01-01
The neuromuscular and cardiovascular effects of neostigmine, 40 mug kg-1, and methyl-atropine, 7 mug kg-1, administered at different degrees of rocuronium-induced (600 mug kg-1) neuromuscular block were evaluated. In one group of patients spontaneous recovery was awaited (Group A; n = 20). Neostigmi
Institute of Scientific and Technical Information of China (English)
刘丽; 王正康; 牟丽琴
2012-01-01
目的 探讨在急性有机磷中毒时使用长托宁(盐酸戊乙奎醚)对阿托品剂量、时间使用的影响.方法 将我院自2003～2009年共收治80例急性有机磷中毒患者分为对照组和治疗组.治疗组为阿托品、碘解磷定加长托宁,对照组为常规使用使用阿托品、碘解磷定组,分析两组患者阿托品用量、维持时间及病死率.结果 长托宁可以使轻、中、重急性有机磷中毒患者减少阿托品用药总量,治疗组分别为15、76、101mg,对照组分别为43、83、840mg减少阿托品用药次数,治疗组分别为:15、23、30次,对照组分别为:20、35、94次,缩短阿托品化时间,治疗组分别为:1.5、3、5h,对照组分别为:3、5、8h,缩短治愈时间:治疗组分别为:3、4、5d,对照组分别为:4、5、6d,两组比较差异有统计学意义.结论 急性有机磷中毒配合使用长托宁,减少阿托品使用总量及维持时间,并且不易发生反跳,病死率降低,长托宁是一种比阿托品效果好、不良反应少的新型抗胆碱能药.%To explore in acute organophosphate poisoning "to use long temple, use of atropine doses. Methods From 2003 -2009 1995,23 cases of acute organophosphate poisoning 80 cases of patients in the control group and divided into treatment group, the treatment group for atropine and recent iodine, torre for extended for routine use of atropine in recent, iodine, analyzes two groups for group patients maintain time and atropine, mortality. Results Torre would make long mild, moderate, and severe acute organophosphale poisoning patients reduce total drug treatment group and atropine 15mg respectively, 76mg, l0lmg, respectively, in 43mg83mg, 840mg reduce atropine, drug treatment group is respectively: 15 times, 23 times, 30 times, respectively is; 20 times, 35, 94, shorten the time of atropine, the treatment group is respectively: 1.5h 5h and control, 3h, respectively, the 5h and 8h: 3h, shorten the time: treatment group cure
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Manganelli, Fiore; Sauro, Rosario; Di Lorenzo, Emilio; Rosato, Giuseppe [San Giuseppe Moscati Hospital, Department of Cardiology and Heart Surgery, Avellino (Italy); Spadafora, Marco; Varrella, Paola; Peluso, Giuseppina [San Giuseppe Moscati Hospital, Nuclear Medicine Unit, Avellino (Italy); Daniele, Stefania [Institute of Diagnostic and Nuclear Development (SDN), Naples (Italy); Cuocolo, Alberto [Institute of Diagnostic and Nuclear Development (SDN), Naples (Italy); University Federico II, Department of Biomorphological and Functional Sciences, Naples (Italy); National Council of Research, Institute of Biostructures and Bioimages, Naples (Italy)
2011-02-15
To evaluate the effects of the addition of atropine to exercise testing in patients who failed to achieve their target heart rate (HR) during stress myocardial perfusion imaging with single-photon emission computed tomography (SPECT). The study was a prospective, randomized, placebo-controlled design. Patients with suspected or known coronary artery disease who failed to achieve a target HR ({>=}85% of maximal predicted HR) during exercise SPECT imaging were randomized to receive intravenous atropine (n = 100) or placebo (n = 101). The two groups of patients did not differ with respect to demographic or clinical characteristics. A higher proportion of patients in the atropine group achieved the target HR compared to the placebo group (60% versus 3%, p < 0.0001). SPECT imaging was abnormal in a higher proportion of patients in the atropine group as compared to the placebo group (57% versus 42%, p < 0.05). Stress-induced myocardial ischaemia was present in more patients in the atropine group as compared to placebo (47% versus 29%, p < 0.01). In both groups of patients, no major side effects occurred. The addition of atropine at the end of exercise testing is more effective than placebo in raising HR to adequate levels, without additional risks of complications. The use of atropine in patients who initially failed to achieve their maximal predicted HR is associated with a higher probability of achieving a diagnostic myocardial perfusion study. (orig.)
Use of atropine to predict the accommodative component in esotropia with hypermetropia
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Mihir Kothari
2011-01-01
Full Text Available This cohort study included children with esotropia and hypermetropia of ≥ +2.0 diopters (D. The deviation was measured at presentation, under atropine cycloplegia and 3 months after full refractive correction. Of 44 children with a mean age of 5.2 ± 2.4 years, 25 were males. Eighteen (41% had fully refractive accommodative esotropia (RAE, 10 (23% had partial accommodative esotropia (PAE, and 5 (11% had nonaccommodative esotropia (NAE. Eleven (25% had convergence excess (CE. Under cycloplegia, all with RAE and RAE with CE had orthotropia. There was no significant change in the deviation in the patients with NAE. The deviation under cycloplegia and that with full refractive correction in PAE and PAE with CE (with +3.0 D addition were not different. The intraclass correlation coefficient for deviation under cycloplegia and after full refractive correction (+3.0 D addition for CE was 0.89. It was concluded that ocular deviation under cycloplegia can help to predict the accommodative component in esotropia with hypermetropia.
Bocskai, Tímea; Németh, Adrienne; Bogár, Lajos; Pytel, József
2013-12-01
Authors investigated sedation quality in children for auditory brainstem response testing. Two-hundred and seventy-six sedation procedures were retrospectively analyzed using recorded data focusing on efficacy of sedation and complications. Intramuscular ketamine-midazolam-atropine combination was administered on sedation preceded by narcotic suppository as pre-medication. On using the combination vital parameters remained within normal range, the complication rate was minimal. Pulse rate, arterial blood pressure and pulse oxymetry readings were stable, hypoventilation developed in 4, apnoea in none of the cases, post-sedation agitation occurred in 3 and nausea and/or vomiting in 2 cases. Repeated administration of narcotic agent was necessary in a single case only. Our practice is suitable for the sedation assisting hearing examinations in children. It has no influence on the auditory brainstem testing, the conditions necessary for the test can be met entirely with minimal side-effects. Our practice provides a more lasting sedation time in children during the examination hence there is no need for the repetition of the narcotics.
Salehi, Satin; Long, Shannon R; Proteau, Philip J; Filtz, Theresa M
2009-01-01
Hawthorn (Crataegus spp.) plant extract is used as a herbal alternative medicine for the prevention and treatment of various cardiovascular diseases. Recently, it was shown that hawthorn extract preparations caused negative chronotropic effects in a cultured neonatal murine cardiomyocyte assay, independent of beta-adrenergic receptor blockade. The aim of this study was to further characterize the effect of hawthorn extract to decrease the contraction rate of cultured cardiomyocytes. To test the hypothesis that hawthorn is acting via muscarinic receptors, the effect of hawthorn extract on atrial versus ventricular cardiomyocytes in culture was evaluated. As would be expected for activation of muscarinic receptors, hawthorn extract had a greater effect in atrial cells. Atrial and/or ventricular cardiomyocytes were then treated with hawthorn extract in the presence of atropine or himbacine. Changes in the contraction rate of cultured cardiomyocytes revealed that both muscarinic antagonists significantly attenuated the negative chronotropic activity of hawthorn extract. Using quinuclidinyl benzilate, L-[benzylic-4,4'-(3)H] ([(3)H]-QNB) as a radioligand antagonist, the effect of a partially purified hawthorn extract fraction to inhibit muscarinic receptor binding was quantified. Hawthorn extract fraction 3 dose-dependently inhibited [(3)H]-QNB binding to mouse heart membranes. Taken together, these findings suggest that decreased contraction frequency by hawthorn extracts in neonatal murine cardiomyocytes may be mediated via muscarinic receptor activation.
Joosen, Marloes J A; van der Schans, Marcel J; van Helden, Herman P M
2010-10-06
The nerve agent VX is most likely to enter the body via liquid contamination of the skin. After percutaneous exposure, the slow uptake into the blood, and its slow elimination result in toxic levels in plasma for a period of several hours. Consequently, this has implications for the development of toxic signs and for treatment onset. In the present study, clinical signs, toxicokinetics and effects on respiration, electroencephalogram and heart rate were investigated in hairless guinea pigs after percutaneous exposure to 500 microg/kg VX. We found that full inhibition of AChE and partial inhibition of BuChE in blood were accompanied by the onset of clinical signs, reflected by a decline in respiratory minute volume, bronchoconstriction and a decrease in heart rate. Furthermore, we investigated the therapeutic efficacy of a single dose of atropine, obidoxime and diazepam, administered at appearance of first clinical signs, versus that of repetitive dosing of these drugs on the reappearance of signs. A single shot treatment extended the period to detrimental physiological decline and death for several hours, whereas repetitive administration remained effective as long as treatment was continued. In conclusion, percutaneous VX poisoning showed to be effectively treatable when diagnosed on time and when continued over the entire period of time during which VX, in case of ineffective decontamination, penetrates the skin.
Śramska, Paula; Maciejka, Artur; Topolewska, Anna; Stepnowski, Piotr; Haliński, Łukasz P
2017-02-01
Tropane alkaloids are toxic secondary metabolites produced by Solanaceae plants. Among them, plants from Datura genus produce significant amounts of scopolamine and hyoscyamine; the latter undergoes racemization to atropine during isolation. Because of their biological importance, toxic properties and commonly reported food and animal feed contamination by different Datura sp. organs, there is a constant need for reliable methods for the analysis of tropane alkaloids in many matrices. In the current study, three extraction and sample-clean up procedures for the determination of scopolamine and atropine in plant material were compared in terms of their effectiveness and repeatability. Standard liquid-liquid extraction (LLE) and EXtrelut(®) NT 3 columns were used for the sample clean-up. Combined ultrasound-assisted extraction and 24h static extraction using ethyl acetate, followed by multiple LLE steps was found the most effective separation method among tested. However, absolute extraction recovery was relatively low and reached 45-67% for atropine and 52-73% for scopolamine, depending on the compound concentration. The same method was also the most effective one for the isolation of target compounds from Datura stramonium leaves. EXtrelut(®) columns, on the other hand, displayed relatively low effectiveness in isolating atropine and scopolamine from such a complex matrix and hence could not be recommended. The most effective method was also applied to the extraction of alkaloids from roots and stems of D. stramonium. Quantitative analyses were performed using validated method based on gas chromatography with flame ionization detector (GC-FID). Based on the results, the importance of the proper selection of internal standards in the analysis of tropane alkaloids was stressed out.
Analysis of Atropine test in 97 cases%阿托品试验97例分析
Institute of Scientific and Technical Information of China (English)
黄丽红; 曲鹏
2011-01-01
[ Objective ] To discuss the clinical value of atropine test on the suspected sick sinus syndrome (SSS) cases.[ Method] Atropine test was performed in 97 patients with suspected SSS who had sinus bradycardia. Transesophageal atrial pacing (TAP) in the positive ones was used to confirm the diagnosis of SSS. [ Results] Among the 97 cases,there were 78whose fastest heart rates were less than 90 beats per minute. Positive rate was 80.4％. And according to the TAP, it was indicated that there were totally 70 SSS sufferers in those 78 cases. The percentage of conformity was 89.7％. [ Conclusion]Atropine test is a simple method and it is better to choose the suspected SSS sufferers that have sinus bradycardia for atropine test so that to raise the percentage of diagnosis.%[目的]探讨对疑有病态窦房结综合征(sick sinus syndrome,SSS)患者行阿托品试验的临床价值.[方法]对97例疑有SSS的窦性心动过缓患者做阿托品试验,其中阳性者行食管心房调搏检查以进一步明确SSS之诊断.[结果]97例中78例最快心率<90次/min,阳性率80.4%;78例行食管心房调搏提示SSS 70例,符合率89.7%.[结论]阿托品试验方法简便,应用于疑有SSS的窦性心动过缓患者可提高对SSS的检出率.
Taysse, L; Calvet, J-H; Buée, J; Christin, D; Delamanche, S; Breton, P
2003-06-30
This investigation compared the efficacy of diazepam and the water-soluble prodiazepam-avizafone-in sarin poisoning therapy. Guinea pigs, pretreated with pyridostigmine 0.1 mg/kg, were intoxicated with 4LD(50) of sarin (s.c. route) and 1 min after intoxication treated by intramuscular injection of atropine (3 or 33.8 mg/kg), pralidoxime (32 mg/kg) and either diazepam (2 mg/kg) or avizafone (3.5 mg/kg). EEG and pneumo-physiological parameters were simultaneously recorded. When atropine was administered at a dose of 3 mg/kg, seizures were observed in 87.5% of the cases; if an anticonvulsant was added (diazepam (2 mg/kg) or avizafone (3.5 mg/kg)), seizure was prevented but respiratory disorders were observed. At 33.8 mg/kg, atropine markedly increased the seizure threshold and prevented early respiratory distress induced by sarin. When diazepam was administered together with atropine, seizures were not observed but 62.5% of the animals displayed respiratory difficulties. These symptoms were not observed when using avizafone. The pharmacokinetic data showed marked variation of the plasma levels of atropine and diazepam in different antidote combination groups, where groups receiving diazepam exhibited the lowest concentration of atropine in plasma. Taken together, the results indicate that avizafone is suitable in therapy against sarin when an anticonvulsant is judged necessary.
Atropine-resistant depolarization in the guinea-pig small intestine.
Bywater, R A; Holman, M E; Taylor, G S
1981-07-01
1. Junction potentials were recorded from the circular muscle cells of the guinea-pig ileum following transmural stimulation in the presence of atropine at 30 degrees C.2. Single stimuli produced a transient hyperpolarization, the inhibitory junction potential (i.j.p.). At high stimulus strengths the i.j.p. was followed by a post-stimulus depolarization (PSD).3. During repetitive stimulation the magnitude of the hyperpolarization decreased; however, at the end of the stimulus period the PSD was enhanced and often reached threshold for the generation of action potentials. Thus, the size of the PSD was not directly related to the degree of the preceding hyperpolarization.4. Hyperpolarization of the circular muscle cells was produced by the application of anodal current using large external electrodes. Rapid cessation of the applied current produced a transient after-depolarization which was shorter in time course than the PSD following the i.j.p. If the applied anodal current was reduced slowly (at a rate which mimicked the decrease in the hyperpolarization during repetitive nerve stimulation) no after-depolarization was observed.5. Conditioning hyperpolarization of the circular muscle cells reduced the amplitude of the i.j.p. The i.j.p. was reversed at membrane potentials greater than approximately -90 mV.6. The PSD did not appear to be due to the extracellular accumulation of potassium ions following the i.j.p. since the PSD persisted even when the i.j.p. was reversed.7. The neurotoxin apamin reversibly abolished the i.j.p. and unmasked a transient excitatory junction potential (e.j.p.) with a variable latency (350-900 ms).
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Abu Saleh Ahmed
2014-03-01
Full Text Available Background:Acute poisoning with organophosphorus (OP pesticides is a common method of suicide and entails considerable mortality in Bangladesh. The objective of this study was to evaluate the effects and outcomes of a protocol for treatment of OP poisoning that included titrated incremental atropine as loading dose and slow infusion for maintenance. Methods:In this prospective descriptive case series, definitive OP poisoned patients were enrolled in an adult medicine unit of Dhaka Medical College Hospital from April 2006 to April 2007. Clinical examinations were done as soon as the patient entered the ward. Patient’s demographics, comorbid conditions and the occurrence of specific clinical outcomes including death, need for assisted ventilation and clinical complications were recorded. The patients were treated according to the protocol. Results: A total of 56 patients were enrolled over the study period. The median age of the study population was 22.5 years. Most patients were men (67.8%. The most common clinical presentation was miosis (58.9%. In total, 11 patients died (19.6%. Intermediate syndrome developed in 12 patients (21.4% and 6 of them died. Assisted ventilation was required in 16 cases (28.5. Patients with diastolic blood pressure ≤ 70 mmHg and/or GCS ≤ 10 were significantly less likely to survive (P = 0.02, 0.006, respectively. Moreover, early respiratory failure (P < 0.001 and the need for assisted ventilation (P < 0.001 were significantly higher among deceased cases. The mortality rate in this study was similar to previous studies. The frequency of atropine toxicity in the present study (1.8% was considerably lower than conventional regimen used in previous studies. Conclusion:Using the new protocol, lower rate of atropine toxicity developed in victims. Hence, the new protocol appears to be safer and its effectiveness should be further evaluated in case control studies in Bangladesh. How to cite this article: Ahmed AS
Fisher, C M
1991-02-01
Visual hallucinations of remarkable intensity began shortly after intravenous atropine and persisted for 11 days. They were present only when the eyes were closed and were associated with heightened dreaming and disturbed sleep. The patient remained lucid and described his experiences to his attendants. Our patient's hallucinations bore some resemblance to hypnagogic hallucinations and this became the basis for the hypothesis that the hallucinations originated in the sleep-dream system of the brain stem. It is speculated that a similar site--a metabolic locus minoris resistentiae may play a part in other types of visual hallucinations and in delirium.
Carron, Michele; Veronese, Stefano
2015-01-29
A 74-year-old morbidly obese man was scheduled for surgical repair of an incisional ventral hernia. Anaesthesia was induced with propofol and fentanyl, and maintained with desflurane. A second dose of fentanyl 0.2 mg, given before starting surgery, resulted in sinus bradycardia and mild decrease of arterial blood pressure. Atropine sulfate 0.5 mg was administered. One minute later, the ECG rhythm on the monitor changed to third degree atrioventricular block with a ventricular response rate of 40 beats/min associated with marked hypotension. Isoproterenol 0.02 mg reverted the atrioventricular block to sinus rhythm. Cardiac enzymes and ECG ruled out acute myocardial ischaemia. The surgical procedure and the recovery from anaesthesia were uneventful. The patient was discharged from the hospital on the fifth postoperative day. For the treatment of bradycardia atropine sulfate should be adjusted at least to lean body weight in order to avoid paradoxical heart rate response in patients with obesity.
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Dulu, Thomas D; Kanui, Titus I; Towett, Philemon K
2014-01-01
-plate, and the formalin tests. The effects of co-administration of the muscarinic receptor antagonist atropine, the nicotinic receptor antagonist mecamylamine, and the opioid receptor antagonist naloxone were also investigated. Oxotremorine and epibatidine induced a significant, dose-dependent antinociceptive effect...... in the tail-flick, hot-plate, and formalin tests, respectively. The effects of oxotremorine and epibatidine were blocked by atropine and mecamylamine, respectively. In all three nociceptive tests, naloxone in combination with oxotremorine or epibatidine enhanced the antinociceptive effects of the drugs....... The present study demonstrated that stimulation of muscarinic and nicotinic receptors produces antinociceptive effects in the naked-mole rat. The reversal effect of atropine and mecamylamine suggests that this effect is mediated by cholinergic receptors. As naloxone increases the antinociceptive effects...
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Feldt-Rasmussen, B F; Gefke, Kaj; Mosbech, H
1985-01-01
Pyridostigmine 0.143 mg kg-1 (maximum 10 mg) and atropine 0.0143 mg kg-1 (maximum 1 mg) were administered i.v. to six healthy male volunteers. Peripheral venous blood samples were drawn for measurement of serum cholinesterase activity. Maximum inhibition of the enzyme was found 5 min after...... injection with a decrease to 27 +/- 5% (mean +/- SEM) of the original activity. Forced expiratory volume in the first 1s (FEV1) was measured at fixed time intervals for 90 min. No decrease in FEV1 was observed; on the contrary, there was a small increase. We conclude that atropine effectively antagonizes...
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Suresha K. R.
2016-12-01
Full Text Available Background: In developing countries 2–3 million people are acutely poisoned by organophosphorus (OP pesticides every year. There is a pressing need for new affordable antidotes and in this context clonidine which has central effect (α2 agonist has been evaluated in the albino rats presenting with signs or symptoms of acute malathion poisoning. And compared with atropine for the acte malathion poisoning in albino rats. Methods: This was a preclinical study conducted on albino rats of either sex weighing 100-150 grams were randomly divided into 4 groups (6/group. Malathion was given at the lethal dose of 54 mg/kg body weight (BW by gavage to each group. Group 1: normal saline intraperioneal (i.p. Group 2: Post treated with atropine 1.5 mg/kg BW (i.p. Group 3: Pre treated with clonidine 1mg/ kg BW (i.p, 10 minutes priore malathion. Group 4: Pre treated with clonidine and post treated with atropine. The above groups were observed for straub tail, muscle fasciculation, piloerection, lacrimation, defecation/ urination; salivation, tremors, gasping and convulsion and were recorded at time 0, 15, 30, 45 and 60 minutes after poisoning. The latency of onset of tremors, loss of righting reflex and tremors were recorded. Results were presented as percentage occurrence and Mean ± SEM. Repeated measure one way ANOVA and Fisher’s Least Significant Difference post hoc test for comparison between groups. P-value of 0.05 or less was considered for statistical significance. Results: The central effects namely straubs tail and whole body tremors are significantly improved compared to control and atropine with clonidine group (p<0.05. However convulsion shows improve in atropine alone and atropine with clonidine groups. The overall survival time has significantly increased compared to control and atropine and atropine with clonidine (P<0.05.Clonidine has not shown any effect on survival time. Conclusions: Clonidine has some central protective effect in
Benschop, H.P.; Trap, H.C.; Spruit, H.E.T.; Wiel, H.J. van der; Langenberg, J.P.; Jong, L.P.A. de
1998-01-01
In order to initiate a quantitative basis for the toxicology of low level exposure to nerve agents, the toxicokinetics of soman stereoisomers during nose-only exposure for 5 h to 20 ppb (160 μg/m3) of C(±)P(±)- soman in air were studied in restrained, anesthetized, and atropinized guinea pigs. The c
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Dhote, Franck, E-mail: franck.dhote@irba.fr [Département de Toxicologie et risques chimiques, Institut de Recherche Biomédicale des armées – Centre de recherches du Service de santé des armées IRBA-CRSSA, 24 avenue des Maquis du Grésivaudan, B.P. 87, 38702 La Tronche cedex (France); Carpentier, Pierre; Barbier, Laure [Département de Toxicologie et risques chimiques, Institut de Recherche Biomédicale des armées – Centre de recherches du Service de santé des armées IRBA-CRSSA, 24 avenue des Maquis du Grésivaudan, B.P. 87, 38702 La Tronche cedex (France); Peinnequin, André [Département Effets biologiques des rayonnements, Institut de Recherche Biomédicale des armées – Centre de recherches du Service de santé des armées IRBA-CRSSA, 24 avenue des Maquis du Grésivaudan, B.P. 87, 38702 La Tronche cedex (France); Baille, Valérie; Pernot, Fabien; Testylier, Guy; Beaup, Claire; Foquin, Annie [Département de Toxicologie et risques chimiques, Institut de Recherche Biomédicale des armées – Centre de recherches du Service de santé des armées IRBA-CRSSA, 24 avenue des Maquis du Grésivaudan, B.P. 87, 38702 La Tronche cedex (France); and others
2012-03-01
Epileptic seizures and status epilepticus (SE) induced by the poisoning with organophosphorus nerve agents (OP), like soman, are accompanied by neuroinflammation whose role in seizure-related brain damage (SRBD) is not clear. Antagonists of the NMDA glutamate ionotropic receptors are currently among the few compounds able to arrest seizures and provide neuroprotection even during refractory status epilepticus (RSE). Racemic ketamine (KET), in combination with atropine sulfate (AS), was previously shown to counteract seizures and SRBD in soman-poisoned guinea-pigs. In a mouse model of severe soman-induced SE, we assessed the potentials of KET/AS combinations as a treatment for SE/RSE-induced SRBD and neuroinflammation. When starting 30 min after soman challenge, a protocol involving six injections of a sub-anesthetic dose of KET (25 mg/kg) was evaluated on body weight loss, brain damage, and neuroinflammation whereas during RSE, anesthetic protocols were considered (KET 100 mg/kg). After confirming that during RSE, KET injection was to be repeated despite some iatrogenic deaths, we used these proof-of-concept protocols to study the changes in mRNA and related protein contents of some inflammatory cytokines, chemokines and adhesion molecules in cortex and hippocampus 48 h post-challenge. In both cases, the KET/AS combinations showed important neuroprotective effects, suppressed neutrophil granulocyte infiltration and partially suppressed glial activation. KET/AS could also reduce the increase in mRNA and related pro-inflammatory proteins provoked by the poisoning. In conclusion, the present study confirms that KET/AS treatment has a strong potential for SE/RSE management following OP poisoning. The mechanisms involved in the reduction of central neuroinflammation remain to be studied. -- Highlights: ► During soman-induced status epilepticus, ketamine-atropine limit brain damage. ► Molecular neuroinflammatory response is strongly decreased. ► Glial activation is
Kennedy, Charles; Tasker, Paul N; Gallacher, Gemma; Westfall, Timothy D
2007-01-24
Acetylcholine and ATP are excitatory cotransmitters in parasympathetic nerves. We used P2X1 receptor antagonists to further characterize the purinergic component of neurotransmission in isolated detrusor muscle of guinea pig urinary bladder. In the presence of atropine (1 microM) and prazosin (100 nM), pyridoxalphosphate-6-azophenyl-2',4'-disulfonic acid (PPADS) (0.1-100 microM) and suramin (1-300 microM) inhibited contractions evoked by 4 Hz nerve stimulation in a concentration-dependent manner (IC50 of 6.9 and 13.4 microM, respectively). Maximum inhibition was 50-60%, which was unaffected by coadministration of the ectonucleotidase inhibitor ARL67156 (6-N,N-diethyl-D-beta,gamma-dibromomethyleneATP) (100 microM). The remaining responses were abolished by tetrodotoxin (1 microM). PPADS and suramin also reduced contractions to exogenous ATP (300 microM) by 40-50%, but abolished those to the P2X1 agonist alpha,beta-methyleneATP (alpha,beta-meATP) (1 microM). The P2X1 antagonists reactive blue 2, NF279 (8,8'-[carbonylbis(imino-4,1-phenylenecarbonylimino-4,1-phenylenecarbonylimino)] bis-1,3,5-naphthalenetrisulfonic acid), MRS2159 (pyridoxal-alpha5-phosphate-6-phenylazo-4'-carboxylic acid) (100 microM), and NF449 [4,4',4,4-(carbonylbis(imino-5,1,3-benzenetriylbis(carbonylimino)))tetrakis-benzene-1,3-disulfonic acid] (3 microM) abolished contractions to alpha,beta-meATP (1 microM; n = 4-5), but only reduced contractions evoked by 4 Hz nerve stimulation by approximately 40-60% (n = 4-6) and ATP by 30-60% (n = 4-7). However, prolonged exposure to alpha,beta-meATP (50 microM) abolished contractions evoked by all three stimuli (n = 5-12). PPADS (100 microM) and suramin (300 microM) reduced the peak neurogenic contraction of the mouse urinary bladder to 30-40% of control. At the same concentrations, the P2X1 antagonists abolished the nonadrenergic, purinergic component of neurogenic contractions in the guinea pig vas deferens (n = 4-5). Thus, P2X1 receptor antagonists inhibit
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Fábio A. Bogaz
2006-12-01
Full Text Available Relatamos caso de mulher de 45 anos de idade, com antecedentes de hipertensão arterial sistêmica e tabagismo, submetida a ecocardiografia sob estresse pela dobutamina-atropina para investigação de doença arterial coronariana. No pico do estresse, a paciente apresentou dor precordial súbita e de forte intensidade. O eletrocardiograma de doze derivações revelou elevação do segmento ST nas derivações DII, DIII, aVF, V5 e V6 e depressão do segmento ST nas derivações DI, aVL, V2 e V3. Pela monitoração das imagens ecocardiográficas foi observado aparecimento de discinesia do septo inferior e acinesia da parede inferior do ventrículo esquerdo. O exame foi interrompido imediatamente, a paciente foi medicada e evoluiu com melhora da dor precordial e das alterações de motilidade segmentar. A angiografia coronariana revelou lesões coronarianas irregulares com menos de 50% de obstrução do diâmetro luminal. Trata-se de um caso de vasoespasmo coronariano induzido por estimulação alfa-adrenérgica durante a ecocardiografia sob estresse pela dobutamina-atropina.This is the report on a 45-year-old female, with a history of systemic arterial hypertension and cigarette smoking, submitted to dobutamine-atropine stress echocardiography for the investigation of coronary artery disease. At stress peak, the patient reported sudden, highly intense precordial pain. The 12-lead electrocardiogram showed ST segment elevation in DII, DIII, aVF, V5 and V6, and depression in DI, aVL, V2 and V3. Echocardiographic imaging monitoring showed dyskinesia of inferior septum and akinesia of inferior wall. The test was interrupted immediately. The patient was medicated and improved her precordial pain condition as well as wall motion abnormalities. Coronary angiography showed irregular coronary lesions with <50% luminal diameter obstruction. It is a case of coronary spasm induced by alpha-adrenergic stimulation during dobutamine-atropine stress
Clair, P; Wiberg, K; Granelli, I; Carlsson Bratt, I; Blanchet, G
2000-01-01
The main purpose of this study was to investigate the chemical stability of a new antidote combination for the treatment of organophosphate poisoning. The antidote combination was packed (enclosed) in two plastic compartments separated by a barrier film. One of them contained a powder oxime cholinesterase reactivator (HI-6-monohydrate 1-[[[4-(aminocarbonyl)pyridinio]methoxy]methyl]-2-[(hydro xyimino)meth yl]-pyridinium dichloride). The other contained an anticholinergic (Atropine) and an anticonvulsant (Prodiazepam or Avizafone (L-lysyl-N-(2-benzoyl-4-chlorophenyl)-N-methyl-glycinamide dihydrochloride) drug in a liquid mixture. The plastic compartments were mounted in an autoinjector device to study the dissolution of HI-6 by ejection of the solution. Drug analysis was performed by high-performance liquid chromatography. The results obtained after 6 months show that this new antidote combination is stable. The amount of each antidote is unchanged during the study. Some known degradation products can be detected in small amounts. The autoinjector mechanism used, gives a complete dissolution of HI-6 powder in the liquid mixture throughout the study.
Goldstein-Dresner, M C; Davis, P J; Kretchman, E; Siewers, R D; Certo, N; Cook, D R
1991-01-01
The effectiveness of oral transmucosal fentanyl citrate (OTFC) as preanesthetic medication was compared with oral meperidine, diazepam, and atropine (MDA) in 40 pediatric patients scheduled to undergo repair of congenital heart defects. In a double-blinded manner, patients received a fentanyl lollipop (20-25 micrograms/kg) and a placebo oral solution (0.4 ml/kg) (n = 20) or a placebo lollipop and an oral solution (0.4 ml/kg) of meperidine (1.5 mg/kg), diazepam (0.2 mg/kg), and atropine (0.02 mg/kg) (n = 20). The patient's vital signs, systolic and diastolic blood pressures, heart rate, respiratory rate, and oxyhemoglobin saturation (SpO2), as well as activity and apprehension scores were evaluated and recorded at baseline and at 10-min intervals. The patient's emotional status at the time of parental separation and at induction of anesthesia were also assessed. Side effects and onset of action were observed. After OTFC, onset of sedation was significantly faster than with the oral solution of meperidine, diazepam, and atropine. In both groups there was no significant change in heart rate. Although systolic blood pressure, diastolic blood pressure, and respiratory rate showed statistically significant decreases, these changes were not clinically significant. The child's emotional status at the time of separation from the parents and during induction was similar in both groups. Side effects with OTFC were more frequent: nose itching occurred in 65%, body itching in 10%, and vomiting in 30%. Two patients (10%) in the OTFC-treated group became hypoxemic (SpO2 less than 90) and required supplemental oxygen. In the group receiving oral meperidine, diazepam, and atropine, 10% had mild facial pruritus and 5% complained of a dry mouth.(ABSTRACT TRUNCATED AT 250 WORDS)
Karakus, Ali; Celik, Muhammet Murat; Karcioglu, Murat; Tuzcu, Kasim; Erden, Ersin Sukru; Zeren, Cem
2014-06-01
Organophosphate poisoning is a life-threatening condition, which is being responsible for the symptoms due to cholinergic effects. Clinical status and blood levels of cholinesterase are used its diagnosis. While atropine and pralidoxime (PAM) appear as essential medications, hemofiltration treatments and lipid solutions have been widely studied in recent years. In this study, the importance of high-dose atropine therapy and early intervention and novel treatment approaches are discussed. Records of a total of 25 patients treated for organophosphate poisoning in the intensive care unit (ICU) between April 2007 and December 2011 were evaluated retrospectively. Of the 25 patients, 14 (56%) were male and 11 (44%) were female with a mean age of 34.8 ± 17.66 years (range: 14-77 years). The patients were most frequently admitted in June (n = 4) and July (n = 4) (16%). Of the 25 patients, 22 patients (88%) were poisoned by oral intake, two (8%) by inhalation, and one (4%) by dermal route. Of them, 20 patients (80%) took organophosphates intentionally for suicidal purposes, while five (20%) cases poisoned due to accidental exposure. The scores of Glasgow Coma Scale of nine patients (36%) were below 8 point upon admission to hospital. The highest dose of atropine given was 100 mg intravenously on admission and 100 mg/h/day during follow-up. The total dose given was 11.6 g/12 days. A total of 11 patients (44%) were on mechanical ventilation for a mean duration of 5.73 ± 4.83 days. The mean duration of ICU stay was 6.52 ± 4.80 days. Of all, 23 patients (92%) were discharged in good clinical condition and one patient (4%) was referred to another hospital. This study suggests that atropine can be administered until secretions disappear and intensive care should be exerted in follow-up of these patients. In addition, in case of necessity for high doses, sufficient amounts of atropine and PAM should be available in hospitals.
LC-ESI MS/MS quantification of atropine and six other antimuscarinic tropane alkaloids in plasma.
John, Harald; Binder, Tobias; Höchstetter, Hans; Thiermann, Horst
2010-01-01
We have developed and validated a quantitative liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI MS/MS) procedure for the simultaneous determination of seven natural and semisynthetic tropane alkaloids in plasma: atropine (d-hyoscyamine/l-hyoscyamine), cocaine, homatropine, ipratropium, littorine, N-butylscopolamine, and scopolamine. Plasma and serum samples were precipitated for deproteinization (recovery 88-94%), followed by reversed-phase-based liquid chromatography prior to positive electrospray ionization for detection by multiple reaction monitoring using a linear ion trap quadrupole mass spectrometer. All analytes were quantified using cocaine-d3 as an internal standard suitable and reliable for robust, precise (coefficient of variation 2-13%), and accurate (87-122%) measurement within a linear range of 3 orders of magnitude (0.05-50 ng/ml plasma). The method was exemplarily applied to stability studies in phosphate-buffered saline, human serum, and rabbit serum. Each alkaloid was incubated separately and samples were taken at distinct incubation time points. Supernatants of diverse alkaloids at corresponding time points were pooled and subjected to simultaneous LC-ESI MS/MS quantification. This combinatorial analysis design allowed us to analyze the stability of samples with a drastically reduced number of chromatographic runs. In the presence of rabbit serum, all tropane alkaloids tested were degraded significantly within minutes to hours, with the exception of the stable semisynthetic compounds ipratropium and N-butylscopolamine. In contrast, in the presence of equal concentrations of human serum, no degradation was observed for any of the compounds, with the exception of cocaine. Relevant enzymes involved in enzymatic degradation are discussed.
Directory of Open Access Journals (Sweden)
Parvin Sajedi
2013-01-01
Full Text Available Background: The current study aimed to determine preventive effect of 2 percent topical xylocaine on oculocardiac reflex in ophthalmological surgeries except strabismus, including retinal detachment and vitrectomy with scleral buckling under general anesthesia. Methods: A randomized controlled clinical trial was carried out on 150 patients aged 18-90 years undergoing ophthalmological surgeries under general anesthesia. Samples randomly divided into the experimental group (received four drops of 2 percent topical xylocaine instilled in desired eye and control group (received 0.5 mg atropine sulfate injection. Systolic, diastolic and mean arterial blood pressure of patients and baseline heart rate were recorded. They were compared regarding the incidence of bradycardia, heart rate less than 60 beats/minute, hypotension and blood pressure less than 90 mm/Hg. Data were analyzed by Statistical Package for the Social Sciences software version 20 using Chi-square and ANOVA. Results: The difference between two groups was not statistically significant regarding demographic and basic variables. The incidence of bradycardia in both groups was respectively (90.7 percent vs. 17.3 percent, heart rate less than 60 beats/minute (40 percent vs. 13.3 percent, hypotension (76 percent vs. 32 percent and blood pressure less than 90 mmHg was (28 percent vs. 8 percent. Accordingly, the differences between both groups were statistically significant (P > 0.001. Conclusions: The preventive impact of topical xylocaine upon oculocardiac reflex in ophthalmological surgeries such as retinal detachment and vitrectomy with scleral buckling under general anesthesia was less effective than that of atropine injection. Therefore, to avoid this reflex in high-risk patients, injecting atropine would be safer.
Poletto, Rosangela; Janczak, Andrew M; Marchant-Forde, Ruth M; Marchant-Forde, Jeremy N; Matthews, Donald L; Dowell, Carol A; Hogan, Daniel F; Freeman, Lynetta J; Lay, Donald C
2011-05-03
Understanding autonomic nervous system functioning, which mediates behavioral and physiological responses to stress, offers great potential for assessing farm animal stress and welfare. Evaluation of heart rate variability (HRV) and blood pressure variability (BPV), using time and frequency domain analyses may provide a sensitive and reliable measure of affective states and stress-mediated changes in sympathetic and parasympathetic tones. The aim of this research was to define low (LF) and high frequency (HF) power spectral ranges using pharmacological autonomic blockade, and to examine HRV and BPV parameter changes in response to atropine and propranolol in swine. Ten, 13-week old, barrows (n=6) and gilts (n=4) underwent surgery to place an intra-cardiac electrode and a blood pressure catheter attached to a biotelemetric transmitter; pigs had a 3-week recovery period prior to data collection. Each pig was subjected to administration of 4 intravenous (i.v.) drug treatments: a control treatment, 3 mL of saline, and 3 blockade treatments; 0.1 mg/kg of atropine, 1.0 mg/kg of propranolol, and .1 mg/kg of atropine together with 1.0 mg/kg of propranolol. All treatments were delivered by injection in the jugular vein with a minimum of 48 h between individual treatments. Behavior, ECG and blood pressure data were recorded continuously for a total of 1h, from 30 min pre-injection to 30 min post-injection. For data analyses, two 512-beat intervals were selected for each treatment while the pig was lying and inactive. The first interval was selected from the pre-injection period (baseline), and the second was selected between 10 and 30 min post-injection. Time and frequency domain (power spectral density) analyses were performed on each data interval. Subsequent, LF and HF bands from the power spectral densities were defined based on general linear and regression analyses. The HRV and BPV were computed with a covariate (baseline) factorial analysis of treatment by sex
Institute of Scientific and Technical Information of China (English)
徐立; 赵芳芳; 郑佳佳; 胡敏; 张玲
2016-01-01
目的：探讨阿托品量化的优质管理，降低有机磷中毒患者出现阿托品中毒现象的概率。方法通过对阿托品化量表的使用，比较量表使用前后对照组和实验组出现的阿托品中毒现象及有机磷中毒反跳的发生率。结果阿托品化量表使用管理后，救治过程中阿托品中毒现象及有机磷中毒反跳现象的发生率，与量表使用管理前比较差异显著（ P＜0．05）。结论量表的使用管理不仅增强护理人员对患者用药观察的准确度，更减少患者阿托品中毒及有机磷中毒反跳的现象发生。%Objective To explore high -quality quantitative management of atropine and to reduce the risk of atropine poisoning in organophosphate poisoning patients .Methods To compare the incidences of the atro-pine poisoning and the bounce organophosphorus poisoning between the experimental group and the control group before and after using the atropine scale .Results There is significant difference in the incidences of atropine poi-soning and bounce organophosphorus poisoning before and after the use of the scale (P<0.05).Conclusion The use of the scale can not only increase the accuracy of medication observation , but also reduce the adverse reaction of atropine poisoning and bounce organophosphorus poisoning .
Institute of Scientific and Technical Information of China (English)
李志; 何伟峰; 邹海军
2012-01-01
目的:探讨临床救治有机磷中毒的患者使用阿托品时采用不同给药方式的疗效差异.方法:将我院在2007年6月~2010年10月收治的101例急性有机磷中毒的患者随机分为三组,I组患者给予阿托品人工静脉推注;II组患者先给予阿托品人工静脉推注,患者达到阿托品化后采用微量泵给药;III组患者直接使用用微量泵给药,比较三组患者的疗效和并发症.结果:II组患者和III组患者的疗效优于I组患者,并发症低于I组患者,p＜0.05;III组患者阿托品化时间最长,与I组和II组比较,p＜0.05.结论:采用阿托品人工静脉推注,待患者阿托品化再给予微量泵给药,其疗效较好,不良反应少,患者阿托品化更稳定,值得在临床推广使用.%Objective:Clinical treatment of patients with organophosphate poisoning atropine administered in different ways when the difference in efficacy.Methods:In our hospital in June 2007~October 2010 treated 101 cases of acute organophosphate poisoning were randomly divided into three groups, I group were treated with intravenous injection of atropine and artificial; Ⅱ patients are atropine artificial intravenous injection, the patient achieved using micro-pump after atropine administration; Ⅲ patients directly with micro-pump delivery, three groups of patients compared the efficacy and complications.Results:Group Ⅱ and Ⅲ patients were more effective than group I patients, complications than group I patients, p <0.05; Ⅲ longest of atropine in patients with Group Ⅰ and Ⅱ group, p <0.05. Conclusion:The use of artificial intravenous injection of atropine, atropine and then be given to patients with micro-pump delivery, the better effect, adverse reactions, patients with atropine is more stable, it is in clinical use.
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Miller, Steven L., E-mail: stevenmiller17@gmail.com [Department of Anatomy, Physiology, and Genetics, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Program in Neuroscience, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Aroniadou-Anderjaska, Vassiliki, E-mail: vanderjaska@usuhs.edu [Department of Anatomy, Physiology, and Genetics, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Department of Psychiatry, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Program in Neuroscience, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Figueiredo, Taiza H., E-mail: taiza.figueiredo.ctr@usuhs.edu [Department of Anatomy, Physiology, and Genetics, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Prager, Eric M., E-mail: eric.prager683@gmail.com [Department of Anatomy, Physiology, and Genetics, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Program in Neuroscience, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Almeida-Suhett, Camila P., E-mail: camilapalmeida@gmail.com [Department of Anatomy, Physiology, and Genetics, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Program in Neuroscience, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814 (United States); Apland, James P., E-mail: james.p.apland.civ@mail.mil [Neurotoxicology Branch, U.S. Army Medical Research Institute of Chemical Defense, Aberdeen Proving Ground, MD 21010 (United States); and others
2015-04-15
Inhibition of acetylcholinesterase (AChE) after nerve agent exposure induces status epilepticus (SE), which causes brain damage or death. The development of countermeasures appropriate for the pediatric population requires testing of anticonvulsant treatments in immature animals. In the present study, exposure of 21-day-old (P21) rats to different doses of soman, followed by probit analysis, produced an LD{sub 50} of 62 μg/kg. The onset of behaviorally-observed SE was accompanied by a dramatic decrease in brain AChE activity; rats who did not develop SE had significantly less reduction of AChE activity in the basolateral amygdala than rats who developed SE. Atropine sulfate (ATS) at 2 mg/kg, administered 20 min after soman exposure (1.2 × LD{sub 50}), terminated seizures. ATS at 0.5 mg/kg, given along with an oxime within 1 min after exposure, allowed testing of anticonvulsants at delayed time-points. The AMPA/GluK1 receptor antagonist LY293558, or the specific GluK1 antagonist UBP302, administered 1 h post-exposure, terminated SE. There were no degenerating neurons in soman-exposed P21 rats, but both the amygdala and the hippocampus were smaller than in control rats at 30 and 90 days post-exposure; this pathology was not present in rats treated with LY293558. Behavioral deficits present at 30 days post-exposure, were also prevented by LY293558 treatment. Thus, in immature animals, a single injection of atropine is sufficient to halt nerve agent-induced seizures, if administered timely. Testing anticonvulsants at delayed time-points requires early administration of ATS at a low dose, sufficient to counteract only peripheral toxicity. LY293558 administered 1 h post-exposure, prevents brain pathology and behavioral deficits. - Highlights: • The LD{sub 50} of soman was determined in postnatal-day-21 rats. • Rats with no seizures after 1.2XLD{sub 50} soman had less reduction of AChE in the amygdala. • Atropine sulfate (ATS) at 2 mg/kg, given at 20 min after
Sikiric, P; Seiwerth, S; Grabarevic, Z; Balen, I; Aralica, G; Gjurasin, M; Komericki, L; Perovic, D; Ziger, T; Anic, T; Prkacin, I; Separovic, J; Stancic-Rokotov, D; Lovric-Bencic, M; Mikus, D; Staresinic, M; Aralica, J; DiBiaggio, N; Simec, Z; Turkovic, B; Rotkvic, I; Mise, S; Rucman, R; Petek, M; Sebecic, B; Ivasovic, Z; Boban-Blagaic, A; Sjekavica, I
2001-01-01
Recently, we showed cysteamine-duodenal lesions without gastric acid, since they were induced also in gastrectomized rats, as in naive rats, and they were inhibited by the novel stomach pentadecapeptide BPC 157 as well as standard antiulcer drugs (i.e. cimetidine, ranitidine, omeprazole, bromocriptine, atropine). Therefore, as an advantage of considering cysteamine as a directly acting cytotoxic agent and mentioned agents as direct cytoprotective agents, the present focus was on the ulcerogenic effect of cysteamine and protective effect of gastroduodenal antiulcer agents outside upper gastrointestinal tract (i.e. in colon). Intrarectal administration of the cysteamine (200 or 400 mg/kg b.w) produced severe colon lesions (i.e. transmural inflammation with serosal involvement) in rats (30 min-72 h-experimental period), apparently distinctive from smaller lesions after non-specific irritant enema [diluted HCl solution, pH 3.8 (adjusted to pH of cysteamine solution (pH 3.8)]. All of the tested antiulcer agents were applied simultaneously with cysteamine enema (8 cm from the anus, in a volume of the 1.0 ml/rat) intraperitoneally (i.p.), intragastrically (i.g.) or intrarectally (i.r.). Pentadecapeptide BPC 157 (10 microg or 10 ng/kg b.w.), given in either regimen, previously shown to have, besides others, a particular beneficial activity just in the intestinal mucosa, inhibited these cysteamine colon lesions (assessed after 30 min, 60 min, 180 min, 24 h, 48 h, 72 h following cysteamine in a dose of either 200 or 400 mg/kg i.r.). Cysteamine-colon lesions were also attenuated by standard antiulcer agents (mg/kg b.w.), given i.p., i.g., or i.r., such as ranitidine (10), cimetidine (50), omeprazole (10), atropine (10), together with methylprednisolone (1), and sulphasalazine (50, i.r.), assessed 30 min following application of 200 mg of cysteamine. Finally, standard cysteamine duodenal lesions (assessed 24 h after a subcutaneous application of 400 mg/kg of cysteamine) were
Institute of Scientific and Technical Information of China (English)
郑凤云
2015-01-01
目的:为了更好地避免有机磷中毒抢救中因应用阿托品过量产生的次生后果.方法:筛查出236例有机磷中毒患者中,因抢救有机磷中毒使用阿托品过量(中毒)的 32 例临床资料.结果:30 例病人经调整阿托品用量及积极综合对症治疗后最终痊愈出院,两例既往有糖尿病的患者因合并肺部感染死于呼吸衰竭.结论:正确地应用阿托品是抢救成功的关键.%Objective: To avoid the secondary consequences of atropine overdose in the rescue of organophosphate poisoning. Methods: The clinical data of 32 case treated with atropine overdose was selected among 236 cases of organophosphate poisoning. Results: 30 cases of patients after adjusting the dosage of atropine and active comprehensive symptomatic treatment eventually recovered and discharged, while 2 cases with diabetes combined with pulmonary infection died of respiratory failure. Conclusion: The correct application of atropine is a key to the success of the rescue.
van der Schans, Marcel J; Lander, Brenda J; van der Wiel, Herma; Langenberg, Jan P; Benschop, Hendrik P
2003-08-15
In continuation of our investigations on the toxicokinetics of the volatile nerve agents C(+/-)P(+/-)-soman and (+/-)-sarin, we now report on the toxicokinetics of the rather nonvolatile agent (+/-)-VX. A validated method was developed to determine blood levels of (+/-)-VX by means of achiral gas chromatography at blood levels > or =10 pg/ml. The ratio of the two enantiomers of VX in blood could be measured at levels > or =1 ng/ml by using chiral HPLC in combination with off-line gas chromatographic analysis. In order to obtain basic information on the toxicokinetics of (+/-)-VX, i.e., under conditions of 100% bioavailability, the blood levels of this agent were measured in hairless guinea pigs at iv doses corresponding with 1 and 2 LD50. The derived AUCs indicate a reasonable linearity of the toxicokinetics with dose. Also, the toxicokinetics in marmoset primates was studied at an absolute iv dose corresponding with 1 LD50 in the hairless guinea pig which led to approximately the same levels of (+/-)-VX in blood as observed at 2 LD50 in the hairless guinea pig. Finally, the toxicokinetics of (+/-)-VX were measured in hairless guinea pigs via the most relevant porte d' entrée for this agent, which is the percutaneous route at a dose corresponding with 1 LD50 (pc). Large variations were observed between individual animals in the rate of penetration of (+/-)-VX and in concomitant progression of AChE inhibition in blood of these animals. Blood levels of (+/-)-VX increased gradually over a 6-h period of time. After a 7-h penetration period, the total AUC corresponded with 2.5% bioavailability relative to iv administration. In contrast with the G-agents C(+/-)P(+/-)-soman and (+/-)-sarin, stereospecificity in the sequestration of the two enantiomers of (+/-)-VX is not a prominent phenomenon. It appears that (+/-)-VX is substantially more persistent in vivo than the two G-agents. This persistence may undermine the efficacy of pretreatment with carbamates of percutaneous
血液灌流对硫线磷和硫酸阿托品的吸附作用%Adsorption effect of Cadusafos and Atropine sulfate by hemoperfusion
Institute of Scientific and Technical Information of China (English)
陈雁君; 金永久; 武文华; 张建萍; 张雪梅; 闫慧芳
2008-01-01
Objective To study on adsorption effect of cadusafos and atropine sulfate by hemoperfusion.Method Hemoperfusions were performed for sheep blood samples with cadusafos and atropineby through imitated extracorporeal closed circulating perfusion apparatus.Residual cadusafos was determined by gas chromatography and residual atropine was determined by high performance liquid chromatography.Result Dose of adsorption agent was 0.5,1.0 and 1.5 g,respectively.Two hours after hemoperfusion with membrane coated activated charcoal,clearance rate of cadusafos in 3 groups all exceeded 90%.and clearance rate of atropine sulfate was 61.9%,84.9%,88.9%,respectively.One and a half hours after hemoperfusion with HA230 absorption resin,clearance rate of eadusafos in 3 groups all exceeded 90%,and clearance rate of atropine sulfate was 88.0%,97.2%,98.4%,respectively.Three hours after hemoperfusion with membrane coated activated charcoal,The concentration ratio of cadusafos and atropine sulfate in blood promoted to 10.1 times,and the ratio was 6.7 times after hemoperfusion with HA230 absorption resin.Conclusion It suggested that cadusafos were mostly removed from blood after 1.5～2.0hours hemoperfusion with membrane activated charcoal or HA230 absorption resin.The concentration ratio of cadusafos and atropine sulfate in blood will increased after hemoperfusion.%目的 定量研究血液灌流对有机磷农药硫线磷和其解毒药阿托品的吸附作用.方法 模拟临床血液灌流装置,对含硫线磷和硫酸阿托品的血样进行灌流吸附,分别用毛细管气相色谱法和高效液相色谱法测定硫线磷和硫酸阿托品的残留量.结果 吸附剂用量为0.5、1.0和1.5 g,包膜活性炭在灌流2.0 h后硫线磷的清除率均能达到90%以上,硫酸阿托品的清除率依次为61.9%、84.9%和88.9%;HA230树脂在灌流1.5 h后硫线磷清除率都达到90%以上,硫酸阿托品的清除率也依次高达88.0%、97.2%和98.4%;包膜活性炭灌流3.0h后,硫
Institute of Scientific and Technical Information of China (English)
刘冬曼
2016-01-01
Objective To investigate the effect of the application of atropine combined with omeprazole in treating acute gastritis.Methods72 cases of acute gastritis were divided into two groups,the treatment group used atropine therapy plus omeprazole,control group used omeprazole alone,compared efficacy and drug safety.Results Treatment group’total effective rate was 94.4%,significantly higher than 77.8% in control group(P<0.05). The incidence of adverse reactions in the treatment group and the control group were statistically significant. Conclusion Omeprazole and atropine in the treatment of acute gastritis have significant,and can reduce adverse reactions in patients after treatment.%目的：探讨阿托品联合奥美拉唑在急性胃炎治疗中的应用效果。方法将72例急性胃炎患者分为两组，治疗组应用阿托品联合奥美拉唑治疗，对照组单纯应用奥美拉唑治疗，对比2组疗效以及用药安全性。结果治疗组治疗总有效率是94.4%，高于对照组的77.8%（P＜0.05）；治疗组、对照组的不良反应发生率组间对比差异有统计学意义（P＜0.05）。结论阿托品联合奥美拉唑在急性胃炎治疗中的应用效果满意，且可减少患者用药后不良反应。
Atropine, Stress and Human Performance
1987-08-01
substance use and abuse and for fitness (exercise stress test) exactly as in the first-year studies. b.2 Research design The research design was A1...Physiological Correlates. New York: Plenum Press, 705-718. 20. Callaway, E. (1984). Human information-processing: Some effects of methylphenidate , age and
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Shivani MHrRA; Sharda Shah PESHIN; Shyam Bala LALL
2001-01-01
AIM: To investigate the cholinesterase inhibition and effect of atropine and pralidoxime (PAM) treatment on the survival time in the rat model of aluminium phosphide (ALP) poisoning. METHODS: The rats were treated with AlP (10 mg/kg; 5.55×LD50; ig) and the survival time was noted. The effect of atropine (1 mg/kg, ip) and PAM (5 mg/kg, ip) was noted on the above. Atropine and PAM were administered 5 min after AlP. Plasma cholinesterase levels were measured spectrophotometrically in the control and AlP treated rats 30 min after administration. RESULTS: Treaanent with atropine and PAM increased the survival time by 2.5 fold (1.4 h ±0.3 h vs 3.4 h±2.5 h, P＜0.01) in9 out of 15 animals and resulted in total survival of the 6 remaining animals. Plasma cholinesterase levels were inhibited by 47％, (438±74) U/L in AlP treated rats as compared tocontrol (840±90) U/L (P＜0.01). CONCLUSION: This preliminary study concludes that AlP poisoning causes cholinesterase inhibition and responds to treatment with atropine and PAM.
Institute of Scientific and Technical Information of China (English)
张随玉
2013-01-01
Objective To observe the influence of atropine,penehyclidine with different opportunity combination on severe acute organophosphate pesticide poisoning (AOPP).Methods Eighty-nine cases of severe AOPP patients were divided into two groups randomly:began joint group (43 cases) and atropinization combination group (46 cases).The began joint group immediately treated with atropine,penehyclidine at hospital admission.The atropinization combination group combined atropine with penehyclidine to maintain atropinization state after reaching atropinization with atropine.Dynamically observe the changes of CHE activity,recorded the number of poisoning rebound,atropine poisoning,intermediate syndrome,death and atropinization time,length of stay,the clinical efficacy of two groups were analyzed.Results Compared with the begain joint group,in the atropinization combination group the time of atropinization,CHE activity resumed to 50％ and hospitalization was obviously shortened [atropinization time:(54.6-± 18.3) min to (65.3 ± 23.1) min (P ＜ 0.01),CHE activity resumed 50％ time (4.2 ±1.9)d to (5.3 ±2.6)d (P＜0.05),hospital stays:(15.1 ±5.6)d to (18.2 ±6.8) d (P＜0.05),poisoning rebound,atropine poisoning incidence was lower poisoning rebound:2.1％ to 13.9％,atropine poisoning:4.3％ to 18.6％ (P ＜ 0.05).IMS incidence,mortality have no significant difference average,(P ＞ 0.05).Conclusions After quickly reached atropinization with atropine,small doses of penehyclidine and the joint use of atropine maintain atropinization state treatment of severe AOPP can reduce the incidence of complications,patients smoothly through dangerous period,reduce hospital stays and cut down medical costs.%目的 观察阿托品、长托宁在不同治疗时机联合对重度急性有机磷农药中毒(AOPP)疗效的影响.方法 将89例重度AOPP患者,随机分为开始联合组(43例)及阿托品化联合组(46例),开始联合组在入院后即行阿托品、长托宁联合治疗,
Institute of Scientific and Technical Information of China (English)
滕光寿; 秦明; 毛峰峰; 张琰; 刘兴友; 贺建荣; 杨鹏; 刘曼玲
2011-01-01
目的 观察小茴香精油及水提物(去油)对阿托品致胃肠动力障碍小鼠胃肠运动的影响.方法 选择昆明种小鼠随机分为空白对照组、阿托品模型组、小茴香水提物组、小茴香精油组、莫沙必利组.空白对照组、阿托品模型组均给予0.2 ml/10 g生理盐水灌胃;小茴香水提物组给予去油小茴香水提物(含小茴香75 mg/ml)0.2 ml/10 g灌胃;小茴香精油组以300 mg/kg精油灌胃,莫沙必利组给莫沙必利混悬液(含莫沙必利15 mg/ml)灌胃.连续3 d,禁食18 h后,于第4天空白对照组腹腔注射生理盐水,其他组腹腔注射硫酸阿托品注射液,以葡聚糖蓝(BD)2000为标记物,观察胃排空率和肠推进率.结果 小茴香精油组、莫沙必利组、小茴香水提物组处理后小鼠的胃排空率分别为(91.97±4.42)%、(90.26±5.81)%、(80.01±6.27)%、(72.88±9.13)%;肠推进率分别为(53.32±7.49)%、(53.02±9.13)%、(44.16±7.68)%、(37.52±6.19)%.小茴香精油组、莫沙必利组、小茴香水提物组对阿托品所致胃肠动力障碍小鼠的胃排空(P值分别为0.004、0.001、0.004)和肠推进(P值分别0.003、0.025、0.015)均有拮抗作用;小茴香精油组促进胃排空作用(P值分别为0.000、0.002)、肠推进作用优于小茴香水提物组(P值分别为0.001、0.001).结论 小茴香提取物可拮抗小鼠的胃肠动力障碍,小茴香精油是主要活性成分.%Objective To observe the effects of fennel essential oil and water extracts (distilled oil is not included) on gastrointestinal motility disorder caused by atropine in mice.Methods Kunming mice were randomly divided into blank control group, model group atropine, water extracts group, fennel essential oil group, mosapride group. Blank control group and model group atropine were orally administered with normal saline of 0.2 ml/10 g. Water extracts group was orally administered with Water extracts (75 mg/ml) of 0.2 ml/10 g. Fennel essential oil group was orally
Institute of Scientific and Technical Information of China (English)
何健华; 李玉香
2014-01-01
目的：探讨利多卡因联合阿托品治疗分娩时宫颈水肿的效果。方法将2010年5月至2013年4月在我院进行阴道试产时发生宫颈水肿的初产妇102例纳入实验组，采用利多卡因联合阿托品宫颈多点注射。以同期采用传统静脉注射地西泮治疗者100例作为对照组。对比两组在宫口全开时间、转剖宫产率、新生儿Apgar评分等方面的差异性。结果与对照组对比，我们发现实验组宫口全开时间较短，转剖宫产率较低，组间差异经统计学分析后认为有意义（P＜0.05）。对比两组新生儿Apgar评分发现，组间差异统计学分析后认为无意义（P＞0.05）。结论采用利多卡因联合阿托品治疗分娩时宫颈水肿具有满意的疗效，有助于缩短产程时间，增加阴道试产成功率，今后可将其作为阴道试产时宫颈水肿治疗的有效方案进行推广应用。%Objective Investigate lidocaine and atropine in the treatment of intrapartum cervix edema effect. Methods Choose 102 cases as experimental group, using lidocaine and atropine cervical multi point injection. Choose 100 cases as control group, injection of diazepam. Compared two groups in the palace mouth open time, turn the cesarean section rate, neonatal Apgar score etc. Results Compared with control group, experimental group palace mouth open for a short time, turn the cesarean section rate is low, differences had significant(P0.05). Conclusion Lidocaine and atropine in the treatment of intrapartum cervix edema has satisfactory curative effect, help to shorten labor time, increase the success rate of vaginal delivery, can be applied effectively for treatment of vaginal cervical edema in the future.
... this page: //medlineplus.gov/ency/article/003371.htm Hemoglobin derivatives To use the sharing features on this page, please enable JavaScript. Hemoglobin derivatives are altered forms of hemoglobin . Hemoglobin is ...
Institute of Scientific and Technical Information of China (English)
许江涛
2012-01-01
For a long time,atropine eye ointment has been widely used as the cycloplegic for children's optometry in China,while internationally,cyclopentolate gutta is widely used as the first choice for cycloplegic.In recent years,1％ cyclopentolate hydrochloride ocular humor has been introduced to our country.This effective and powerful cycloplegic has already been paid close attention to by domestic pedoophthalmiaters.According to a serious of studies both home and abroad on the therapeutic effects of the own control drugs,the cycloplegia effect of cyclopentolate is close to the atropine. Cyclopentolate can be widely used for the cycloplegia before optometry for the Chinese children.However,the effect of cyclopentolate is still not as good as atropine. So,for the children with farsightedness within 7 years old,all esotropia children,Am children,and children who suffer from decreased vision acuteness and needs to be excluded from accommodative myopia, atropine eye ointment should be routinely used for cycloplegia before optometry.In this article,we also discuss the medication dosage,medication method,possible drug adverse reactions of cyclopentolate humor ocular and the coping measures at the same time.%阿托品眼膏长期以来都是中国儿童验光主流使用的睫状肌麻痹剂,而国际上则普遍使用环戊通滴眼液作为一线的睫状肌麻痹药物.近年来,国内引了进1％盐酸环戊通眼液,这种快速强效的睫状肌麻痹剂已被国内小儿眼科医师所关注.一系列国内外自身对照药物疗效研究证实,环戊通的睫状肌麻痹效果接近于阿托品,能广泛应用于中国儿童验光前的睫状肌麻痹.尽管如此,其药物疗效仍略逊于阿托品,故对于7岁以内的远视儿童、所有内斜视儿童、混合性散光儿童及短期内视力下降需要排除调节性近视的儿童,验光前仍应常规使用阿托品眼膏行睫状肌麻痹.本文同时对环戊通眼液的用药剂量、用药方法、可
Institute of Scientific and Technical Information of China (English)
刘真; 陈玮; 刘玉岭; 赵梅
2010-01-01
Objective To observe the therapeutic effect of low level laser combined with atropine in treatment of ametropic amblyopia. Methods One hundred and twenty children (240 eyes with ametropic amblyopia) were grouped randomly, and the improvement of visual acuity and visual function between the two methods were compared. Results The differences in binocularvision improvement and stereopsis visual acuity of the two methods were significant(t=2.24,P<0.05).Conclusions Low level laser combined with atropine therapy seems to be superio to traditional treatment in binocularvision improvement and recovery.%目的 观察弱激光联合阿托品疗法对屈光不正性弱视的疗效.方法 120例(240只弱视眼)患儿随机分为治疗组(弱激光联合阿托品疗法)和对照组(传统治疗),比较两种方法对视力的提升效果及双眼视功能的改善情况.结果 弱激光联合阿托品疗法使弱视眼视力进步有效率及立体视锐度与对照组比较差异有统计学意义(t=2.24,P<0.05).结论 弱激光联合阿托品疗法更有利于患儿视力提升、双眼视力恢复.
DEFF Research Database (Denmark)
Wigan, Duncan
2013-01-01
Contemporary derivatives mark the development of capital and constitute a novel form of ownership. By reconﬁguring the temporal, spatial and legal character of ownership derivatives present a substantive challenge to the tax collecting state. While ﬁscal systems are nationally bounded and inheren...... and inherently static, capital itself is unprecedentedly mobile, ﬂuid and fungible. As such derivatives raise the specter of ‘ﬁnancial weapons of mass destruction’....
Noller, Johannes
2012-01-01
We consider generalized chameleon models where the conformal coupling between matter and gravitational geometries is not only a function of the chameleon field \\phi, but also of its derivatives via higher order co-ordinate invariants. Specifically we consider the first such non-trivial conformal factor A(\\phi,X), where X is the canonical kinetic term for \\phi. The associated phenomenology is investigated and we show that such theories have a new generic mass-altering mechanism, potentially assisting the generation of a sufficiently large chameleon mass in dense environments. The most general effective potential is derived for such derivative chameleon setups and explicit examples are given. Interestingly this points us to the existence of a purely derivative chameleon protected by a shift symmetry for \\phi. We also discuss potential ghost-like instabilities associated with mass-lifting mechanisms and find another, mass-lowering and instability-free, branch of solutions. This suggests that, barring fine-tuning...
Institute of Scientific and Technical Information of China (English)
朱艳霞; 杨贤义; 肖敏
2012-01-01
Objective To compare the clinical efficacy of penehyclidime hydrochloride and atropine in treatment of a-cute organophosphate pesticide poisoning. Methods Totally 76 patients within six hours of organophosphorus pesticide poisoning were randomly divided into penehyclidime hydrochloride group (re = 38) and atropine group ( n = 38 ),they were all combined with pralidoxime chloride,different doses of penehyclidime hydrochloride and atropine were given according to difference degrees of severity which was ranged in terms of cholinesterase value. The clinical efficacy of two groups was compared. Results The penehyclidime hydrochloride group,the poisoning symptoms time,cuative time and CHE recovery time were compared with that of the atropine group,the difference was statistically significant (P < 0. 01) ; The incidence rate of adverse reactions significantly less than that of the atropine group ( P < 0. 01). Conclusion Penehyclidime hydrochloride in treatment of acute organophosphate pesticide poisoning is safer and more effective than atropine.%目的 比较盐酸戊乙奎醚与阿托品治疗急性有机磷农药中毒的临床疗效.方法 76例6h内有机磷农药中毒者随机分成盐酸戊乙奎醚组(38例)和阿托品组(38例),均配伍用氯解磷定,分别按照胆碱酯酶数值划分的轻中重度程度,给予不同剂量的盐酸戊乙奎醚及阿托品,比较两组患者的临床疗效.结果 盐酸戊乙奎醚组的中毒症状消失时间、治愈时间、CHE恢复时间与阿托品组比较,差异均有统计学意义(P＜0.01);并且不良反应的发生率明显比阿托品组低(P＜0.01).结论 盐酸戊乙奎醚治疗急性有机磷农药中毒疗效确切,不良反应少,优于阿托品.
Institute of Scientific and Technical Information of China (English)
李战梅; 黄海; 周李
2013-01-01
Objective:To compare the effect of tropicamide and atropine ophthalmic solution in mydriatic refractometry for children.Methods:Totally 260 cases (520 eyes) of ametropia children from 4 to 14 years without other eye disease were received optometry after using the tropicamide eye drops and 1%atropine sulfate,The results of optometry were compared by paired T-test.Results:There existed statistically significant difference between the hyperopia and myopia in 4 to 7 years old group,hyperopia in 8 to 11 years old group.But there were no significant difference between the myopia in 8 to 11 years old group,myopia and hyperopia in 12 to 14 years old group.Conclusion:Aged 8 years and older children with myopia and hyperopia in aged 12 years and above children could receive optometry after using the tropicamide eye drops.% 目的：对比托吡卡胺与阿托品眼液对儿童散瞳验光的效果。方法：用托吡卡胺眼液和1%硫酸阿托品眼膏先后分别对4~14岁260例(520只眼)，无其它眼疾，眼位正常的屈光不正儿童散瞳后进行电脑验光，采用自身配对t检验对两种药物验光结果进行比较。结果：4~7岁组远视、近视和8~11岁组远视两种药物散瞳验光所得结果差异有统计学意义(P0.05)。结论：托吡卡胺散瞳验光方法适用于眼位正常的8岁及以上近视儿童和12岁及以上远视儿童。
Noller, Johannes
2012-07-01
We consider generalized chameleon models where the conformal coupling between matter and gravitational geometries is not only a function of the chameleon field phi, but also of its derivatives via higher order co-ordinate invariants (such as ∂μphi∂μphi,squphi,...). Specifically we consider the first such non-trivial conformal factor A(phi,∂μphi∂μphi). The associated phenomenology is investigated and we show that such theories have a new generic mass-altering mechanism, potentially assisting the generation of a sufficiently large chameleon mass in dense environments. The most general effective potential is derived for such derivative chameleon setups and explicit examples are given. Interestingly this points us to the existence of a purely derivative chameleon protected by a shift symmetry for phi → phi+c. We also discuss potential ghost-like instabilities associated with mass-lifting mechanisms and find another, mass-lowering and instability-free, branch of solutions. This suggests that, barring fine-tuning, stable derivative models are in fact typically anti-chameleons that suppress the field's mass in dense environments. Furthermore we investigate modifications to the thin-shell regime and prove a no-go theorem for chameleon effects in non-conformal geometries of the disformal type.
DEFF Research Database (Denmark)
Andersen, Torben Juul
." - Steen Parsholt, Chairman and CEO, Aon Nordic Region. "Andersen has done a wonderful job of developing a comprehensive text that deals with risk management in global markets. I would recommend this book to any student or businessman who has a need to better understand the risks and risk management...... management practice. Of particular note is the global and integrated approach chosen in this book which should be of special interest to aspiring managers active in global and international markets." - Dr Jean-Pierre Zigrand, Lecturer in Finance, London School of Economics, UK. More than 90 per cent...... management situations. Its key features include: derivatives are introduced in a global market perspective; describes major derivative pricing models for practical use, extending these principles to valuation of real options; practical applications of derivative instruments are richly illustrated...
Aïd, René
2015-01-01
Offering a concise but complete survey of the common features of the microstructure of electricity markets, this book describes the state of the art in the different proposed electricity price models for pricing derivatives and in the numerical methods used to price and hedge the most prominent derivatives in electricity markets, namely power plants and swings. The mathematical content of the book has intentionally been made light in order to concentrate on the main subject matter, avoiding fastidious computations. Wherever possible, the models are illustrated by diagrams. The book should allow prospective researchers in the field of electricity derivatives to focus on the actual difficulties associated with the subject. It should also offer a brief but exhaustive overview of the latest techniques used by financial engineers in energy utilities and energy trading desks.
Byadagi, Kirthi S; Nandibewoor, Sharanappa T; Chimatadar, Shivamurti A
2013-01-01
Atropine sulfate monohydrate (ASM) is an anticholinergic drug, having a wide spectrum of activity. Hence, the kinetics of oxidation of ASM by diperiodatocuperate (DPC) in the presence of micro (10-6) amounts of Ru(III) catalyst has been investigated spectrophotometrically in aqueous alkaline medium at I = 0.50 mol dm-3. The reaction between DPC and ASM exhibits 1:2 stoichiometry (ASM:DPC) i. e., one mole of ASM require two moles of DPC to give products. The main oxidation products were confirmed by spectral studies. The reaction is first order with respect to [DPC] and [Ru(III)], while the order with respect to [ASM] and [OH-] was less than unity. The rates decreased with increase in periodate concentration. The reaction rates revealed that Ru(III) catalyzed reaction was about seven-fold faster than the uncatalyzed reaction. The catalytic constant (KC) was also determined at different temperatures. A plausible mechanism is proposed. The activation parameters with respect to slow step of the mechanism were calculated and the thermodynamic quantities were also determined. Kinetic experiments suggest that [Cu(H2IO6)(H2O)2] is the reactive Cu(III) species and [Ru(H2O)5OH]2+ is the reactive Ru(III) species.
Fowble, Kristen L; Teramoto, Kanae; Cody, Robert B; Edwards, David; Guarrera, Donna; Musah, Rabi A
2017-03-21
Methods for the accomplishment of small-molecule imaging by mass spectrometry are challenged by the need for sample pretreatment steps, such as cryo-sectioning, dehydration, chemical fixation, or application of a matrix or solvent, that must be performed to obtain interpretable spatial distribution data. Furthermore, these steps along with requirements of the mass analyzer such as high vacuum, can severely limit the range of sample types that can be analyzed by this powerful method. Here, we report the development of a laser ablation-direct analysis in real time imaging mass spectrometry approach which couples a 213 nm Nd:YAG solid state UV laser to a direct analysis in a real time ion source and high-resolution time-of-flight mass spectrometer. This platform enables facile determination of the spatial distribution of small-molecules spanning a range of polarities in a diversity of sample types and requires no matrix, vacuum, solvent, or complicated sample pretreatment steps. It furnishes high-resolution data, can be performed under ambient conditions on samples in their native form, and results in little to no fragmentation of analytes. We demonstrate its application through determination of the spatial distribution of molecules involved in the biosynthetic cascade leading to formation of the clinically relevant alkaloids atropine and scopolamine in Datura leichhardtii seed tissue.
Energy Technology Data Exchange (ETDEWEB)
Olson, C.T.; Menton, R.G.; Kiser, R.C.; Hayes, T.L.; Matthews, M.C.
1995-08-01
This task was conducted to determine the minimum dose of pyridostigmine (PYR), and the associated level of erythrocyte acetycholinesterase inhibition (AChE-I), that provides protection from 5 X 48-br GD LD50 of untreated monkeys. Monkeys were injected im with GD and treated with 0.4 mg atropine (ATR) free base and 25.7 mg pralidoxime (2-PAM) per kg BW.
Directory of Open Access Journals (Sweden)
Mohammad Hossein Sattari
2016-06-01
Full Text Available In this article, the notion of $n-$derivation is introduced for all integers $ngeq 2$. Although all derivations are $n-$derivations, in general these notions are not equivalent. Some properties of ordinary derivations are investigated for $n-$derivations. Also, we show that under certain mild condition $n-$derivations are derivations.
Suppression of torsades de pointes by atropine
1998-01-01
A 67 year old woman with a history of chronic atrial fibrillation presented with asthma cardiale. She took no medication and there was no family history of long QT syndrome. She was treated with furosemide, nitroprusside, acenocoumarol, and digoxin. Two days later excessively prolonged RR intervals, which were terminated by escape beats with a right bundle branch block morphology, suggested impending total AV block. There was also severe QT (0.48 s) and QTc (0.56) interval prolongation with b...
基于荧光光谱的硫酸阿托品拮抗中乌头碱毒性的机制研究%Atropine sulfate against toxicity of mesaconitine by fluorescence spectra
Institute of Scientific and Technical Information of China (English)
崔力剑; 王建明; 霍坤; 黄芸; 窦玉红; 王鑫国
2012-01-01
Objective To study the bonding of mesaconitine (MA) with bovine serum albumin (BSA) and the effect of atropine sulfate (AS) on its interaction. Methods Ultraviolet absorption and fluorescence spectra were used. Results MA had strong fluorescence quenching effect on BSA via a dynamic quenching procedure. The apparent bonding constant (Kb) and the number of bonding sites (n) of MA and BSA were increased with temperature rising. The predominant intermolecular forces between MA and BSA were hydrophobic interactions, which could make the MA-BSA bonding stabilized and the combined distance was 4.44 nm. The negative value of free energy change was taken as an evidence for the spontaneity of MA-BSA bonding. The synchronous fluorescence spectra indicated that protein microenvironment was changed by MA. AS decreased Kb and n, and inhibited the conformation change of BSA. Conclusion AS could act competitively with MA in bonding to BSA and increase the content of free MA. AS could accelerate the metabolism for detoxification by reducing accumulation in body.%目的 研究模拟生理条件下中乌头碱(MA)与牛血清白蛋白(BSA)的键合作用,以及硫酸阿托品(AS)对其相互作用的影响.方法 主要采用荧光光谱法及紫外吸收光谱法进行研究.结果 MA对BSA有较强的荧光猝灭作用,猝灭机制为动态猝灭.MA与BSA表观结合常数(Kb)和结合位点数(n)均随着温度升高而增大,二者之间的相互作用力类型主要为疏水作用,结合距离为4.44 nm,该反应是自发进行的.同步荧光光谱图的信息表明MA对蛋白微环境有影响.AS使MA和BSA的Kb和n均减小:抑制MA对BSA构象的改变.结论 MA与BSA能发生相互作用,AS与MA间存在竞争作用,能够增加游离型MA浓度,通过减少MA在生物体内的积累,加快代谢,发挥解毒作用.
Institute of Scientific and Technical Information of China (English)
高明涛; 周锦; 陈克研; 张铁铮; 王长英
2013-01-01
#目的探讨氨茶碱和阿托品联合应用在心脏瓣膜置换术中对患者心动过缓的治疗作用。方法选取在心脏瓣膜置换术中，体外循环停止、复跳5 min后发生心动过缓（心率＜50次/min ）患者90例，按美国麻醉师协会标准分级（ ASA）Ⅱ～Ⅲ级，随机分为三组：A组30例，首次静注阿托品0.5 mg，无效则每5 min追加阿托品1 mg；B组30例，首次静注阿托品1 mg，无效则每5 min追加阿托品1 mg；C组30例，首次联合静注阿托品0.5 mg和氨茶碱0.125 g，无效则以相同剂量静注追加。观察并记录三组患者术中心律失常和术后恶心、呕吐等不良反应的发生情况，比较药物的平均作用剂量，分析三组的治疗有效率。结果三组患者ASA分级、体重、心功能等一般情况差异不显著（ P＞0.05）。 C组治疗有效率（90.00％）明显高于A组（46.67％）和B组（53.33％）（χ2＝14.10，P＜0.05）。 C组阿托品平均作用剂量为（0.86±0.17）mg，低于A组（1.83±0.12）mg和B组（1.79±0.45）mg（q＝6.91、7.62，P均＜0.05）。 C组不良反应发生情况明显低于A组和B组（χ2＝4.05，P＜0.05）。结论氨茶碱和阿托品联合应用对心脏瓣膜置换手术患者心动过缓具有很好的治疗作用，可有效地提高治愈率，降低毒副反应，提高麻醉安全性。%Objective To investigate bradycardia treatment effects of co-administration of aminophylline and atropine in patients undergoing cardiac valve replacement with cardiopulmonary bypass (CPB).Methods When five minute after stopping CPB , ninety patients with cardiac valve replacement were randomly divided into three groups:Group A:30 patients were infused intravenously 0.5 mg atropine in the first place .Atropine 1 mg would be added every five minute if ineffective .Group B:30 patients were infused intravenously 1 mg atropine in the first place . Atropine 1 mg would be added every five minute if
Derived logarithmic geometry I
Steffen, Sagave; Timo, Schurg; Gabriele, Vezzosi
2016-01-01
In order to develop the foundations of logarithmic derived geometry, we introduce a model category of logarithmic simplicial rings and a notion of derived log \\'etale maps and use this to define derived log stacks.
Directory of Open Access Journals (Sweden)
Fabíola Niederauer Flôres
2008-08-01
, at least 7 days apart, in randomized blinded manner. Anesthesia was induced and maintained with isoflurane in mechanical ventilation. After instrumentation, the end-tidal isoflurane was maintained at 1,3%V throughout the study. After a 30 minutes stabilization period (M -15, baseline hemodynamic parameters and arterial blood gases were recorded and atropine (atropine group or 0.9% NaCl (saline group were administered. Fifteen minutes later, data were recorded again (M0 and a chlorpromazine- dexmedetomidine (Chlor-Dex combination was administered. Variables were measured for an additional 65 minutes after Chlor-Dex. A one-way ANOVA-Student-Newman-Keuls was used for comparisons within groups, while a paired t test was used for comparisons between groups (P£0,05. Heart rate was higher in atropine group after Chlor-Dex administration. Cardiac index (CI was reduced from baseline after Chlor-Dex in both treatments. Although mean CI values tended to be higher in atropine group, CI did not differ between groups. Chlor-Dex administration caused increased arterial blood pressure in dogs treated with atropine. Mean arterial pressure (MAP was significantly higher in the atropine group from 5 to 65 min after Chlor-Dex. The systemic vascular resistance index (SVRI increased from baseline in both groups after Chlor-Dex administration. No significant differences were observed for arterial blood gases. Atropine administration prior to Chlor-Dex resulted in increased arterial blood pressure. Bradycardia induced by the administration of these drugs was prevented by the anticholinergic given, however decrease in cardiac output was not prevented.
Institute of Scientific and Technical Information of China (English)
肖世南; 余朝阳; 王文军
2016-01-01
目的：研究阿托品试验联合24 h动态心电图对预测窦性心动过缓患者猝死风险的效果分析。方法选取2011年2月~2015年3月于解放军第一医院接收的窦性心动过缓患者64例，所有患者均未安装心脏永久性起搏器，行24 h动态心电图检查，延长1 h给予阿托品静脉推注，记录患者最高心率变化，通过与24 h动态心电图所示最慢时间段心率结果分析，评估窦性心动过缓患者猝死风险。结果所有受试的窦性心动过缓患者中，最低心率＜45次/min有21例，40～60次/min 43例。在延长检查1 h并接受阿托品激发试验后，以最大心率＞85次/min为阴性，共42例，＜85次/min为阳性，共22例，评估所有患者的猝死风险并进行分组，死亡13例，占20.3%，各组病死率有明显差异（P＜0.05）。结论阿托品试验联合24 h动态心电图对窦性心动过缓患者猝死风险有明显预测价值，在1 h激发试验过程中，如患者最大心率低于85次/min即视为猝死高风险患者，需格外警惕，可通过安装永久性起搏器以降低其猝死风险。%Objective To study the effect of atropine test combining 24 h ambulatory electrocardiograph monitoring (Holter) in predicting risk of sudden death in patients with sinus bradyarrhythmia.Methods The patients (n=64) were chosen from the Department of Heart and Kidney of Chinese PLA First Hospital from Feb. 2011 to Mar. 2015, and all of them was implanted permanent pacemakers. The patients were given 24 h Holter for observing cardiac impulse, and injected intravenously atropine in extended 1 h. The changes of maximum heart rate (HR) were recorded particularly. The risk of sudden death was analyzed and reviewed through the outcomes of HR in the slowest period showed by 24 h Holter.Results Among all patients, there were 21 with HR85/min (negative), and 22 with the maximum HR<85/min (positive), which were taken for reviewing the risk of sudden
Ji-Huan He
2011-01-01
A new fractal derive is defined, which is very easy for engineering applications to discontinuous problems, two simple examples are given to elucidate to establish governing equations with fractal derive and how to solve such equations, respectively.
Derived equivalence of algebras
Institute of Scientific and Technical Information of China (English)
杜先能
1997-01-01
The derived equivalence and stable equivalence of algebras RmA and RmB are studied It is proved, using the tilting complex, that RmA and RmB are derived-equivalent whenever algebras A and B are derived-equivalent
Institute of Scientific and Technical Information of China (English)
曾昌水
2011-01-01
目的 对窦性心动过缓(SN)患者作24 h动态心电图(Holter)检查,结尾时连接作阿托品激发窦房结试验,分析窦房结功能以进行猝死风险预测.方法 选择近4年来因各种原因未能安装心脏永久性起博器之SN患者43例,控制心功能在Ⅱ级以内,剔除房性、交界性和室性传导阻滞、Brugada综合征、J波综合征者.经24 h Holter检查延长1 h,静脉推注阿托品1.5～2.0 mg,记录1 h内最大心率变化,结合Holter最慢时间段心率判断SN患者猝死可能.结果 在43例SN患者中,Holter反应出最低时间的心率＜45次/min有11例;40～60次/min有32例.在Holter结尾1 h阿托品激发试验中,最大心率＜85次/min阳性,＞85次/min为阴性,识别出猝死的高危、中危、低危人群.在此3组患者中总死亡人数为9例,占43例SN患者病死率20%,组间存在着不同的病死率.结论 窦性心动过缓患者最慢心率60次/min以下,Holter连接阿托品激发窦房结功能试验,1 h最大心率＜85次/min为高危患者,4年内发生猝死可能性为83.3%,需安装永久性起搏器,以预防猝死发生.%Objective To analyze the function of sinus node (SN) and to predict sudden death by combined using of 24h dynamic electrocardiography (Holter) and atropine testing. Methods 43 patients with sinus bradycardia and without implantation of permanent pacemaker were selected for study. The cardiac function of all patients were ≤NYHA Ⅱ, excluding supraventricular and ventricular block, Brugada syndrome and J wave syndrome cases. The 24h Holter examination was taken with extension of one more hour. 1.5-2.0 mg of atropine were intravenously injected. The maximum heart rate within 1 hour was recorded. Combining with the slowest heart rate in Holter examination to forecast the sudden death possibility of SN patients. Results According to the results of Holter testing, there were 11 patientsˊ heart rate ＜45 bpm, 32 patientsˊ heart rate between 40 and 60 bpm
Directory of Open Access Journals (Sweden)
Juliana Tabarelli Brondani
2003-10-01
Full Text Available A toracotomia é um procedimento cirúrgico que produz estímulo doloroso intenso. O objetivo deste estudo foi avaliar o efeito cardiovascular da associação tramadol, butorfanol e atropina na medicação pré-anestésica de gatos anestesiados com propofol e halotano. Doze animais, SRD, machos ou fêmeas, com peso médio de 2,7 ± 0,62kg receberam como medicação pré-anestésica (MPA, a associação de tramadol (2,0mg kg-1, butorfanol (0,4mg kg-1 e atropina (0,044mg kg-1, via intramuscular. Trinta minutos após MPA, a indução foi realizada com propofol (5,0mg kg-1 por via intravenosa. A manutenção anestésica foi obtida com halotano e oxigênio 100% sob ventilação artificial manual. Os gatos foram submetidos à toracotomia intercostal para implante de um segmento autólogo de pericárdio no diafragma. As variáveis avaliadas foram: freqüência cardíaca (bpm, saturação de oxigênio da hemoglobina (%, pressão arterial sistólica (mmHg e vaporização de halotano (%. As variáveis foram mensuradas 20 minutos após a MPA (TMPA, 10 minutos após indução e a cada 10 minutos até o final do procedimento cirúrgico (T10 a T100.Os dados obtidos foram analisados estatisticamente através de ANOVA e teste de Bonferroni (pIntercostal thoracotomy is a very painful procedure that deserves proper prevention and treatment. In this study we aimed to investigate the cardiovascular effect of the association of tramadol, butorphanol and atropine in the premedication of cats anesthetised with propofol and halothane. Twelve cats of mixed breed, female and male, with mean body weight of 2.7 ± 0.62kg were premedicated with 2.0mg kg-1 tramadol and 0.4mg kg-1 butorphanol and 0.044mg kg-1 atropine combined in the same syringe intramuscularly administered. After 30 minutes of premedication, anesthetic induction was obtained with 5.0mg kg-1 propofol intravenously. Anesthetic maintenance was done with halothane and 100% oxygen with manual artificial
Schulte, Christian
2008-01-01
When implementing a propagator for a constraint, one must decide about variants: When implementing min, should one also implement max? Should one implement linear equations both with and without coefficients? Constraint variants are ubiquitous: implementing them requires considerable (if not prohibitive) effort and decreases maintainability, but will deliver better performance. This paper shows how to use variable views, previously introduced for an implementation architecture, to derive perfect propagator variants. A model for views and derived propagators is introduced. Derived propagators are proved to be indeed perfect in that they inherit essential properties such as correctness and domain and bounds consistency. Techniques for systematically deriving propagators such as transformation, generalization, specialization, and channeling are developed for several variable domains. We evaluate the massive impact of derived propagators. Without derived propagators, Gecode would require 140000 rather than 40000 ...
Institute of Scientific and Technical Information of China (English)
陈良龙; 罗育坤; 孙旭东; 洪华山; 陈春光
2000-01-01
Objective To compare glueagon and atropine in enhancing detection of myocardial ischemia during dobutamine stress echocardiography(DSE).Methods Dobutamine stress testing(DST)was performed in 11 pigs with 1.0 mg was added at the peak dose of dobutamine for combined pharmacological stress testing(DGST/DAST),respectively.Myocardial perfusion,regional lactate production and coronary venous pH,wall thickening,heart rate,and.systolic blood pressure were measured at each experimental stage.Results β-blockade significantlv inhibited ischemic responses during DSE,the effects of β-blockade on myocardial perfusion,metabolism and contraction were almost completely reversed by glucagon and partially by atropine.Conclusions DGST is superior to DAST in reversing β-blockade effects and enhances DSE in the detection of myocardial ischemia.%目的 探讨多巴酚丁胺负荷超声心动图(DSE)中β受体阻滞剂对心肌缺血的抑制作用,比较胰高血糖素和阿托品在逆转p受体阻滞剂效应及增强心肌缺血检测能力中的作用.方法 实验动物猪11只,结扎其左前降支造成冠脉狭窄模型.在此模型上行基础多巴酚丁胺负荷试验(DST),静滴Esmolol50μg/(kg·min)后重复DST汀,并在DST达到峰剂量时静脉推注胰高血糖素或阿托品各1.0mg分别与多巴酚丁胺进行联合负荷试验(DGST和DAB-F).观察三个实验阶段心肌灌流、代谢、收缩功能及血流动力学变化.结果 β受体阻滞剂明显抑制DST过程中的心肌缺血反应,DST几乎完全、DAST部分逆转β受体阻滞剂对心肌灌流、代谢、收缩和血流动力学的影响.结论 DGST逆转β受体阻滞剂对心肌缺血的抑制作用优于DAST,作为一种新的联合药物试验方法可增加DSE检测心肌缺血的敏感性.
Financial Derivatives in China
Institute of Scientific and Technical Information of China (English)
无
2006-01-01
Francis Repka sees bright prospects for the future development of the financial derivatives market in China. Repka,Vice President of the Asian Bond Finance Department of Societe Generale, says the situation in France just after the birth of derivatives was very similar to the situation in China today.
Numerical Integration with Derivatives
Institute of Scientific and Technical Information of China (English)
Hu Cheng
2006-01-01
A new formula with derivatives for numerical integration was presented. Based on this formula and the Richardson extrapolation process, a numerical integration method was established. It can converge faster than the Romberg's. With the same accuracy, the computation of the new numerical integration with derivatives is only half of that of Romberg's numerical integration.
DEFF Research Database (Denmark)
Singh, Shailja; Agarwal, Drishti; Sharma, Kumkum;
2016-01-01
Synthetic quinoline derivatives continue to be considered as candidates for new drug discovery if they act against CQ-resistant strains of malaria even after the widespread emergence of resistance to CQ. In this study, we explored the activities of two series of new 4-aminoquinoline derivatives...
Hesselink, Wim H.
1992-01-01
The LR(k)-parsing algorithm is derived, i.e., presented and proved as an interplay between program development and parsing theory. The program development uses invariants and the new concept of weakest angelic precondition. The parsing theory involved relates rightmost derivability to three other tr
DEFF Research Database (Denmark)
Dyppel, Katja Joo
2013-01-01
in the Danish tax legislation. However, contracts known as forwards (terminskontrakter) and options (aftaler om køberetter og salgsretter) are generally included in the term financials contracts covered by the Danish Act on Taxation of Gains and Losses on Claims and Debt. The main part of the analysis deals...... with the scope of sections 29-33 of the Danish Act on Taxation of Gains and Losses on Claims and Debt and the tax consequences for the covered financial contracts. In the analysis of taxation of derivatives, the fundamental issues of qualification and tax treatment of the instruments are dealt with.......The main objective for this thesis is to analyse and systematise the Danish legislation on taxation of derivatives. According to financial terminology, a derivative is a financial instrument. Its value is derived from changes in the value of one or more underlying assets.The most common derivatives...
Lifescience Database Archive (English)
Full Text Available PLAIN A03BA Belladonna alkaloids, tertiary amines A03BA01 Atropine D07477 Atropine oxide (INN) USP drug clas...DRUGS FOR FUNCTIONAL GASTROINTESTINAL DISORDERS A03B BELLADONNA AND DERIVATIVES,
Amphetamine derivative related deaths.
Lora-Tamayo, C; Tena, T; Rodríguez, A
1997-02-28
Amphetamine its methylendioxy (methylendioxyamphetamine methylenedioxymethylamphetamine, methylenedioxyethylamphetamine) and methoxy derivatives (p-methoxyamphetamine and p-methoxymethylamphetamine) are widely abused in Spanish society. We present here the results of a systematic study of all cases of deaths brought to the attention of the Madrid department of the Instituto Nacional de Toxicologia from 1993 to 1995 in which some of these drugs have been found in the cadaveric blood. The cases were divided into three categories: amphetamine and derivatives, amphetamines and alcohol, amphetamines and other drugs. Data on age, sex, clinical symptoms, morphological findings, circumstances of death, when known, and concentration of amphetamine derivatives, alcohol and other drugs in blood are given for each group. The information provided here may prove to be useful for the forensic interpretation of deaths which are directly or indirectly related to abuse of amphetamine derivatives.
DEFF Research Database (Denmark)
Holm, Henrik Granau
2004-01-01
Over any associative ring R it is standard to derive HomR(;) using projective resolutions in the rst variable, or injective resolutions in the second variable, and doing this, one obtains Extn R(;) in both cases. We examine the situation where projective...... and injective modules are replaced by Gorenstein projective and Gorenstein injective ones, respectively. Furthermore, we derive the tensor product R using Gorenstein at modules....
Brain derived neurotrophic factor
DEFF Research Database (Denmark)
Mitchelmore, Cathy; Gede, Lene
2014-01-01
Brain Derived Neurotrophic Factor (BDNF) is a neurotrophin with important functions in neuronal development and neuroplasticity. Accumulating evidence suggests that alterations in BDNF expression levels underlie a variety of psychiatric and neurological disorders. Indeed, BDNF therapies are curre......Brain Derived Neurotrophic Factor (BDNF) is a neurotrophin with important functions in neuronal development and neuroplasticity. Accumulating evidence suggests that alterations in BDNF expression levels underlie a variety of psychiatric and neurological disorders. Indeed, BDNF therapies...
DEFF Research Database (Denmark)
Kokholm, Thomas
financial models, and most importantly, to be aware of their limitations. Following that belief, this thesis consists of three independent and self-contained papers, all dealing with topics in derivatives pricing. The first paper considers the pricing of traffic light options, which are appropriate....... With the existence of a liquid market for derivatives with variance as underlying, such as VIX options, VIX futures and a well-developed over-the-counter market for options on variance swaps, it is important to consider models that are able to fit these markets while consistently pricing vanilla options...
Institute of Scientific and Technical Information of China (English)
郭晓丽
2011-01-01
Objective To observe the efficacy and value of Integrative treatment of arrhythmia.Methods Totally 58 patients were randomly divided into treatment groups of patients bradyarrhythmia and the control group, control group given western medicine treatment of 29 cases of oral atropine 0.3mg,3 times/day treatment.Besed on atropine the treatment group of 29 cases were added Senxianshengmai oral liquid 20mi orally,2 times/day.2 weeks.Results The treatment group obvious effective 7cases,effective in 17 cases,5 cases ineffective,the total effective rate was 92.6％ ;Control group 3 cases were markedly,effective in 13 cases,ineffective in 13 cases,55％ of the total effective rate.Difference between the two groups was significant ( P ＜ 0.01 ); Surface ECG and 24 - hour ambulatory ECG,the treatment group and control group,the total effective rate was 90％ and 41％ ,the total number of 24 - hour heart rate were( 89420 ± 4800)time and (63250 ± 3700)times, the difference was significant ( P ＜0.01 ).Conclusions Integrative Medicine bradycardia effective than western medicine.Some patients can be free from pacemaker and is worthy of promotion.%目的 观察中西医结合疗法治疗缓慢性心律失常的疗效及应用价值.方法 随机将58例缓慢心律失常患者分为治疗组及对照组,对照绀29例给予西医治疗,口服阿托品0.3mg,3次/d治疗.治疗组29例在采用阿托品治疗基础上加用参仙升脉口服液,每次20ml口服,2次/d.疗程2周.结果 治疗组显效7例,有效17例,无效5例,总有效率92.6%;对照组显效3例.有效13例,无效13例,总有效55%.两组差别有统计学意义(P＜0.01);体表心电图和24h动态心电图,治疗组和对照组总有效率分别为90%和41%,24h心率总数分别是(89 420±4 800)次和(63 250±3 700)次,两组差异有统计学意义(P＜0.01).结论 中西医结合治疗缓慢性心律失常的疗效优于纯西药治疗.可使部分患者免于安装起搏器,值得临床推广.
Institute of Scientific and Technical Information of China (English)
侯媛媛; 李若洁; 彭佳敏; 王利强
2010-01-01
华山参滴丸是含有托烷类生物碱的中药制剂,主要用于治疗哮喘,具有很好的临床疗效,但缺乏较有效的定量方法控制其质量.建立了一种快速、简单、准确的HPLC-MS/MS法同时测定华山参滴丸中阿托品、山莨菪碱和东莨菪碱的含量.首先采用超声的方法对滴丸进行提取来制备样品溶液,然后采用C18色谱柱对样品进行分离.流动相为20 mmol/L醋酸铵水溶液:甲醇(70:30);流速为0.3 mL/min.质谱检测器采用电喷雾正离子模式的多重反应监测方式进行测定,整个分析时间仅耗时1.5 rain.阿托品和山莨菪碱在250～4 000 ng/mL范围内、东莨菪碱在62.5～1 000 ng/mL范围内均呈良好的线性关系(r2＞0.999).三种成分的日内和日间精密度均小于3.0;平均回收率均大于98%.此方法快速、可靠、重现性好,适用于华山参滴丸的日常质量控制.%Huashanshen dripping pill,traditional Chinese medicine(TCM)preparation containing tropane alkaloids,is used for the anti-asthmatic treatment and has good clinical efficacy.But there is not an effective quantification method to assess the quality of Huashanshen dripping pill.In this study,a rapid,simple and accurate HPLC-MS/MS method was developed for simultaneous determination of atropine,anisodamine and scopolamine in Huashanshen dripping pill.After a simple extraction with sonication used for sample preparation,chromatographic separation was performed on a short C18 column with mobile phase of a mixture of 20 mmol/L ammonium acetate in water and methanol(70:30)at a flow rate of 0.3 mL/min.The mass spectrometer equipped with an electrospray ionization source(ESI)was operated in the positive ion mode using multiple reaction monitoring(MRM).The whole analytical run time was only 1.5 min and the calibration graphs exhibited a linear concentration range of 250～4 000 ng/mL for atropine and anisodamine and 62.5～1 000 ng/mL for scopolamine with correlation coefficients of
Institute of Scientific and Technical Information of China (English)
余小平; 王彬
2000-01-01
目的:探讨阿托品(Atropine,ATR)、荷包牡丹碱(Bicuculline,BIC)对家鸽顶盖Ⅱa-f亚层与Ⅲ层神经元间突触传递的影响.方法:在孵育离体顶盖脑片标本上,采用脉冲方波电刺激Ⅱa-f亚层,利用玻璃微电极胞外记录技术记录Ⅲ层神经元放电频率.结果:Ⅲ层神经元对电刺激Ⅱa-f亚层有反应的28个单位中,13个单位(占46.4%)表现为增频,15个单位(占53.6%)表现为减频.表现为增频的13个Ⅲ层神经元中10个单位(占76.9%)的增频效应可被ATR部分或完全逆转,另3个单位的阻断效果不明显;15个被Ⅱa-f亚层刺激传入减频的Ⅲ层神经元,其中11个单位(占73.3%)的减频作用可被BIC阻断,另4个单位则不产生阻遏作用.上述药物的作用具有可逆性和重复性.结论:乙酰胆碱(Acetylcholine,ACh)可能参与了家鸽顶盖Ⅱa-f亚层与Ⅲ层神经元间兴奋性突触传递,而γ-氨基丁酸(Gamma-aminobutyric,GABA)则参与其抑制性突触传递.
Deriving diffeomorphism symmetry
Kleppe, Astri
2014-01-01
In an earlier article, we have "derived" space, as a part of the Random Dynamics project. In order to get locality we need to obtain reparametrization symmetry, or equivalently, diffeomorphism symmetry. There we sketched a procedure for how to get locality by first obtaining reparametrization symmetry, or equivalently, diffeomorphism symmetry. This is the object of the present article.
Oxygenated Derivatives of Hydrocarbons
For the book entitled “Insect Hydrocarbons: Biology, Biochemistry and Chemical Ecology”, this chapter presents a comprehensive review of the occurrence, structure and function of oxygenated derivatives of hydrocarbons. The book chapter focuses on the occurrence, structural identification and functi...
DEFF Research Database (Denmark)
Mosley, Cara A; Acker, Timothy M; Hansen, Kasper Bø;
2010-01-01
We describe a new class of subunit-selective antagonists of N-methyl D-aspartate (NMDA)-selective ionotropic glutamate receptors that contain the (E)-3-phenyl-2-styrylquinazolin-4(3H)-one backbone. The inhibition of recombinant NMDA receptor function induced by these quinazolin-4-one derivatives ...
Institute of Scientific and Technical Information of China (English)
盛红宇; 李志军; 王其琼; 许明; 艾斯娅; 班新全; 李惠荣
2015-01-01
Objective To evaluate the clinical application value of transesophageal atrial pacing (TEAP) combined with atropine load experiment in the diagnosis of the lesions of sinoatrial node and atrioventricular node.Methods One hundred and forty-four cases selected from the outpatient and hospitalized patients in the People's Hospital of Changji Hui Autonomous Prefecture from September 2009 to December 2012,who with dizziness, syncope and other clinical symptoms and electrocardiogram showe.TEAP combined with atropine load experiment were given to these patients.Results (1) The authors detected in all patients,83 cases (57.6％) were positive, among which, 48 cases (57.8％) male, 35 cases (42.2％) female.(2) The authors detected 57 cases(39.6％) non-increased vagus nerve tension cases in 83 positive cases,among which 33 cases (57.9％) male, 24 cases (42.1％) female;Among which 29 cases (20.1％) were sinoatrial node hypofunction, and 16 cases(55.2％) male;8 cases(5.6％) were atrioventricular node hypofunction,and 4 cases(50％) male;14 cases(9.7％) were double node hypofunction, and 10 cases (71.4％) male;6 cases (4.2％) were tachycardia-bradycardia syndrome, and 3 cases (50％) male;among which, a long interval of greater than 3 seconds appeared when we stimulate one 84 years old man with S1S1 stimulate way, immediately pressed protective pacemaker until his own sinus rhythm was restored, as a safety precaution, stoped further examination and classified him as sick sinus group.Conclusion Detect the common causes of slow sinus and atrioventricular block,such as the sinoatrial node dysfunction, atrioventricular node dysfunction, double node dysfunction and increased vagus nerve tension through TEAP combined with atropine load experiment.Consider that this methods have the best diagnostic value in decreasing its rate of false positivity,and should be used as a necessary check before implantation of pacemaker in such patients, suitable used in clinical, especially
Approximate *-derivations and approximate quadratic *-derivations on C*-algebras
Directory of Open Access Journals (Sweden)
Park Choonkil
2011-01-01
Full Text Available Abstract In this paper, we prove the stability of *-derivations and of quadratic *-derivations on Banach *-algebras. We moreover prove the superstability of *-derivations and of quadratic *-derivations on C*-algebras. 2000 Mathematics Subject Classification: 39B52; 47B47; 46L05; 39B72.
Fractional Derivative Cosmology
Roberts, Mark D
2009-01-01
The degree by which a function can be differentiated need not be restricted to integer values. Usually most of the field equations of physics are taken to be second order, curiosity asks what happens if this is only approximately the case and the field equations are nearly second order. For Robertson-Walker cosmology there is a simple fractional modification of the Friedman and conservation equations. In general fractional gravitational equations similar to Einstein's are hard to define as this requires fractional derivative geometry. What fractional derivative geometry might entail is briefly looked at and it turns out that even asking very simple questions in two dimensions leads to ambiguous or intractable results. A two dimensional line element which depends on the Gamma-function is looked at.
Systems of integrable derivations
Directory of Open Access Journals (Sweden)
Vittoria Bonanzinga
1994-05-01
Full Text Available Let A be a commutative k-algebra, with k a subring of A. We give the definition of n-dimensional differentiation of A over k which formally extends the known one of unidimensional differentiation and we study the group of all n-dimensional differentiation of A over k. In the second part of the work we give some theorems of strong integrability for systems of derivations in terms of n-dimensional differentiation.
2015-06-01
time; i.e., is evaluated at the steady-state reference flight condition. However, this derivation provides no definitive information about limits of...dimensional straight- tapered wing in unsteady flow. Assume that the lift is defined by a function that depends on properties of the fluid (density...kinematic viscocity, and speed-of-sound; wing geometric characteristics (area, mean aerodynamic chord and taper ratio); and its motion (free-stream
Intracellular Ca2+ signals in human-derived pancreatic somatostatin-secreting cells (QGP-1N).
Squires, P E; Amiranoff, B; Dunne, M J
1994-10-01
Single-cell microfluorimetry techniques have been used to examine the effects of acetylcholine (0.1-100 microM) on the intracellular free calcium ion concentration ([Ca2+]i) in a human-derived pancreatic somatostatin-secreting cell line, QGP-1N. When applied to the bath solution, acetylcholine was found to evoke a marked and rapid increase in [Ca2+]i at all concentrations tested. These responses were either sustained, or associated with the generation of complex patterns of [Ca2+]i transients. Overall, the pattern of response was concentration related. In general, 0.1-10 microM acetylcholine initiated a series of repetitive oscillations in cytoplasmic Ca2+, whilst at higher concentrations the responses consisted of a rapid rise in [Ca2+]i followed by a smaller more sustained increase. Without external Ca2+, 100 microM acetylcholine caused only a transient rise in [Ca2+]i, whereas lower concentrations of the agonist were able to initiate, but not maintain, [Ca2+]i oscillations. Acetylcholine-evoked Ca2+ signals were abolished by atropine (1-10 microM), verapamil (100 microM) and caffeine (20 mM). Nifedipine failed to have any significant effect upon agonist-evoked increases in [Ca2+]i, whilst 50 mM KCl, used to depolarise the cell membrane, only elicited a transient increase in [Ca2+]i. Ryanodine (50-500 nM) and caffeine (1-20 mM) did not increase basal Ca2+ levels, but the Ca(2+)-ATPase inhibitors 2,5-di(tert-butyl)-hydroquinone (TBQ) and thapsigargin both elevated [Ca2+]i levels. These data demonstrate for the first time cytosolic Ca2+ signals in single isolated somatostatin-secreting cells of the pancreas. We have demonstrated that acetylcholine will evoke both Ca2+ influx and Ca2+ mobilisation, and we have partially addressed the subcellular mechanism responsible for these events.
Endostatin derivative angiogenesis inhibitors
Institute of Scientific and Technical Information of China (English)
ZHENG Meng-jie
2009-01-01
Objective To throw light on the superiority of the anti-angiogenesis activity of endostatin (ES) derivatives by reviewing the recent progress in the field of ES molecular structure modification.Data sources The data used in this article were mainly from PubMed with relevant English articles published from 1971 to May 2008.The search terms were "endostatin" and "angiothesis".Study selection Articles involved in the ES molecular structure modification and the original milestone articles were selected.Results A number of ES derivatives were designed and studied to improve its clinical relevance.The modified ES with polyethylene glycol (PEG),low molecular weight heparin (LMWH) and IgG Fc domain extended the circulation half-life.Meanwhile the recombinant ESs showed more potent anti-tumor activity than native ES in mouse xenografts.Mutated ES also changed its anti-angiogenesis activity.Conclusions The anti-angiogenesis treatment remains a promising tumor therapeutic strategy.New ES derivatives would be a good choice to meet the future challenge on clinical application of ES.
Credit derivatives and risk management
Michael S. Gibson
2007-01-01
The striking growth of credit derivatives suggests that market participants find them to be useful tools for risk management. I illustrate the value of credit derivatives with three examples. A commercial bank can use credit derivatives to manage the risk of its loan portfolio. An investment bank can use credit derivatives to manage the risks it incurs when underwriting securities. An investor, such as an insurance company, asset manager, or hedge fund, can use credit derivatives to align its...
Mungan, Carl E.
2016-05-01
At the 2015 AAPT Summer Meeting, I presented four derivations of the formula for motional emf. Such physics derivations involve the construction of explanatory frameworks involving diagrams and mathematical models. Although textbooks devote considerable space to such explanations, many teachers and students spend their time on worksheets, end-of-chapter problems, and the like. The book is reduced to a bank of solved (i.e., example) and unsolved (i.e., homework) questions, along with equations in colored boxes that presumably are to be used to answer those questions. Such an approach encourages fragmentation of knowledge, the view that there is only one right answer to a problem with the goal of physics being to find that answer (neatly boxed of course), and the inability to reason about even a slightly different (much less a novel) situation. If we are to develop scientific literacy, significant course time must be devoted to explaining the structure of and support for the models and equations we use.
Generalized Derivations and Bilocal Jordan Derivations of Nest Algebras
Directory of Open Access Journals (Sweden)
Dangui Yan
2011-01-01
Full Text Available Let H be a complex Hilbert space and B(H the collection of all linear bounded operators, A is the closed subspace lattice including 0 an H, then A is a nest, accordingly alg A={T∈B(H:TN⊆N, ∀N∈A} is a nest algebra. It will be shown that of nest algebra, generalized derivations are generalized inner derivations, and bilocal Jordan derivations are inner derivations.
Acquiring Knowledge of Derived Nominals and Derived Adjectives in Context
Marinellie, Sally A.; Kneile, Lynn A.
2012-01-01
Purpose: This research investigated children's ability to acquire semantic and syntactic knowledge of derived nominals and derived adjectives in the context of short passages. The study also investigated the relation of morphological awareness and the ability to acquire knowledge of derived words in context. Method: A total of 106 children in…
Elevation Derivatives for National Applications
U.S. Geological Survey, Department of the Interior — Elevation Derivatives for National Applications (EDNA) is a seamless, nationwide, multi-layered three-dimensional (3D) hydrologic database derived from a version of...
Energy Technology Data Exchange (ETDEWEB)
Jahan, Kauser [Rowan Univ., Glassboro, NJ (United States)
2015-03-31
One of the most promising fuel alternatives is algae biodiesel. Algae reproduce quickly, produce oils more efficiently than crop plants, and require relatively few nutrients for growth. These nutrients can potentially be derived from inexpensive waste sources such as flue gas and wastewater, providing a mutual benefit of helping to mitigate carbon dioxide waste. Algae can also be grown on land unsuitable for agricultural purposes, eliminating competition with food sources. This project focused on cultivating select algae species under various environmental conditions to optimize oil yield. Membrane studies were also conducted to transfer carbon di-oxide more efficiently. An LCA study was also conducted to investigate the energy intensive steps in algae cultivation.
DEFF Research Database (Denmark)
Foss, Kirsten; Foss, Nicolai Juul; Klein, Peter G.
2007-01-01
Recent work links entrepreneurship to the economic theory of the firm, using the concept of entrepreneurship as judgment introduced by Frank Knight. When judgment is complementary to other assets, it makes sense for entrepreneurs to hire labour and to own assets. The entrepreneur's role, then......, is to arrange or organize the human and capital assets under his or her control. We extend this Knightian concept of the firm by developing a theory of delegation under Knightian uncetainty. What we call original judgment belongs exclusively to owners, but owners may delegate a wide range of decision rights...... to subordinates, who exercise derived judgment. We call these employees `proxy-entrepreneurs', and ask how the firm's organizational structure - its formal and informal systems of rewards and punishments, rules for settling disputes and renegotiating agreements, means of evaluating performance and so on - can...
DEFF Research Database (Denmark)
Foss, Kirsten; Foss, Nicolai Juul; Klein, Peter G.
Recent work links entrepreneurship to the economic theory of firm using the Knightian concept of entrepreneurship as judgment. When judgment is complementary to other as-sets, and these assets or their services are traded in well-functioning markets, it makes sense for entrepreneurs to hire labor...... and own assets. The entrepreneur's role, then, is to arrange or organize the human and capital assets under his control. We extend this Knightian concept of the firm by developing a theory of delegation under Knightian uncertainty. What we call original judgment belongs exclusively to owners, but owners...... may delegate a wide range of decision rights to subordinates, who exercise derived judgment. We call these employees "proxy-entrepreneurs," and ask how the firm's or-ganizational structure — its formal and informal systems of rewards and punishments, rules for settling disputes and renegotiating...
R.J. Stroeker (Roel)
2002-01-01
textabstractA Q-derived polynomial is a univariate polynomial, defined over the rationals, with the property that its zeros, and those of all its derivatives are rational numbers. There is a conjecture that says that Q-derived polynomials of degree 4 with distinct roots for themselves and all their
R.J. Stroeker (Roel)
2006-01-01
textabstractA Q-derived polynomial is a univariate polynomial, defined over the rationals, with the property that its zeros, and those of all its derivatives are rational numbers. There is a conjecture that says that Q-derived polynomials of degree 4 with distinct roots for themselves and all their
Institute of Scientific and Technical Information of China (English)
姜向春; 杨丽莹
2015-01-01
目的：比较麻醉前联合应用长托宁和阿托品与单用长托宁对老年患者术后谵妄的影响。方法选择该院外科行腹部手术全身麻醉老年患者128例，按随机数字表法分为联合组、长托宁1组、长托宁2组和对照组四组，每组32例。术前30 min：长托宁1组使用长托宁0.01 mg/kg肌内注射，长托宁2组使用长托宁0.005 mg/kg肌内注射，对照组使用生理盐水肌内注射，联合组使用长托宁0.005 mg/kg和阿托品0.005 mg/kg肌内注射，麻醉方法均采用全身麻醉。于术前1 d和术后1、2、7 d采用护理谵妄筛查量表（Nu-DESC-SCV）进行谵妄评估，于术前1 d及术后72 h采用简易智力状态量表（MMSE）进行认知功能测定，并进行对比分析。结果与对照组比较，长托宁1组MMSE评分均显著下降，Nu-DESC-SCV评分均显著提高，差异均有统计学意义（P＜0.05），联合组和长托宁两组与对照组比较，MMSE评分及Nu-DESC-SCV评分下降不显著，差异均无统计学意义（P＞0.05），联合组谵妄发生率均明显高于长托宁1组、长托宁2组及对照组，差异均有统计学意义（P＜0.05）。结论长托宁联合阿托品能增加老年患者术后谵妄，临床须谨慎使用。%Objective To compare diffrent clinical therapeutic effect of Penehyclidine Hydrochloride Injection uniting a-tropine and Penehyclidine Hydrochloride Injection on postoperative delirium of the elderly. Methods Selected 128 elderly ab-dominal surgery patients under general anesthesia and randomly divided them into uniting group ,Penehyclidine Hydrochloride Injection 1,Penehyclidine Hydrochloride Injection 2,and control group with 32 cases in each one. Gave 0.01 mg/kg Penehyclidine Hydrochloride Injection to Penehyclidine Hydrochloride Injection 1 through intramuscular injection ,0.005 mg/kg Penehyclidine Hydrochloride Injection to Penehyclidine Hydrochloride Injection 2 through intramuscular injection ,normal
Piroxicam derivatives THz classification
Sterczewski, Lukasz A.; Grzelczak, Michal P.; Nowak, Kacper; Szlachetko, Bogusław; Plinska, Stanislawa; Szczesniak-Siega, Berenika; Malinka, Wieslaw; Plinski, Edward F.
2016-02-01
In this paper we report a new approach to linking the terahertz spectral shapes of drug candidates having a similar molecular structure to their chemical and physical parameters. We examined 27 newly-synthesized derivatives of a well-known nonsteroidal anti-inflammatory drug Piroxicam used for treatment of inflammatory arthritis and chemoprevention of colon cancer. The testing was carried out by means of terahertz pulsed spectroscopy (TPS). Using chemometric techniques we evaluated their spectral similarity in the terahertz range and attempted to link the position on the principal component analysis (PCA) score map to the similarity of molecular descriptors. A simplified spectral model preserved 75% and 85.1% of the variance in 2 and 3 dimensions respectively, compared to the input 1137. We have found that in 85% of the investigated samples a similarity of the physical and chemical parameters corresponds to a similarity in the terahertz spectra. The effects of data preprocessing on the generated maps are also discussed. The technique presented can support the choice of the most promising drug candidates for clinical trials in pharmacological research.
Directory of Open Access Journals (Sweden)
S. S. Kadam
2014-06-01
Full Text Available Malicious software is a major issue in today’s computer world. Such software can silently reside in user’s computer and can easily interact with computing resources. It is necessary to improve the honesty of host and its system data. For improvement in security and honesty of host, this work is introduced. This mechanism ensures the correct origin or provenance of critical system information and prevents utilization of host resources by malware. Using this mechanism the source where a piece of data is generated can be identified. A cryptographic origin approach ensures system properties and system- data integrity at kernel level. A frame work is used for restricting outbound malware traffic. This frame work identifies network activities of malware. This frame work can be used as powerful personal firewall for investigating outgoing traffic of a host. Specifically, our derivation verification scheme requires outgoing network packets to flow through a checkpoint on a host, to obtain proper origin proofs for later verification.
Directory of Open Access Journals (Sweden)
S. S. Kadam
2015-11-01
Full Text Available Malicious software is a major issue in today’s computer world. Such software can silently reside in user’s computer and can easily interact with computing resources. It is necessary to improve the honesty of host and its system data. For improvement in security and honesty of host, this work is introduced. This mechanism ensures the correct origin or provenance of critical system information and prevents utilization of host resources by malware. Using this mechanism the source where a piece of data is generated can be identified. A cryptographic origin approach ensures system properties and system- data integrity at kernel level. A frame work is used for restricting outbound malware traffic. This frame work identifies network activities of malware. This frame work can be used as powerful personal firewall for investigating outgoing traffic of a host. Specifically, our derivation verification scheme requires outgoing network packets to flow through a checkpoint on a host, to obtain proper origin proofs for later verification.
Experts' understanding of partial derivatives using the Partial Derivative Machine
Roundy, David; Dray, Tevian; Manogue, Corinne A; Weber, Eric
2014-01-01
Partial derivatives are used in a variety of different ways within physics. Most notably, thermodynamics uses partial derivatives in ways that students often find confusing. As part of a collaboration with mathematics faculty, we are at the beginning of a study of the teaching of partial derivatives, a goal of better aligning the teaching of multivariable calculus with the needs of students in STEM disciplines. As a part of this project, we have performed a pilot study of expert understanding of partial derivatives across three disciplines: physics, engineering and mathematics. Our interviews made use of the Partial Derivative Machine (PDM), which is a mechanical system featuring four observable and controllable properties, of which any two are independent. Using the PDM, we probed expert understanding of partial derivatives in an experimental context in which there is not a known functional form. Through these three interviews, we found that the mathematicians exhibited a striking difference in their underst...
Derivations, Products of Derivations, and Commutativity in Near-rings
Institute of Scientific and Technical Information of China (English)
Howard E. Bell; Nurcan Argac
2001-01-01
For a zero-symmetric 3-prime near-ring N, we study three kinds of conditions: (a) conditions involving two derivations d1, d2 which imply that d1 = 0 or d2 = 0; (b) conditions involving derivations which force (N, +) to be abelian or N to be a commutative ring; (c) the condition that dn (S) is multiplicatively central for some derivation d and subset S of N.
Directory of Open Access Journals (Sweden)
Pedro Antonio Muniz Ferreira
2007-01-01
Full Text Available OBJETIVO: Avaliar a exeqüibilidade, a segurança e a acurácia diagnóstica do ecocardiograma sob estresse (EEDA com dobutamina/atropina em candidatos a transplante renal. MÉTODOS: Pacientes candidatos a transplante renal com e sem nefropatia diabética realizaram EEDA e cineangiocoronariografia. Consideraram-se dois pontos de corte para doença arterial coronariana (DAC: > 50% e > 70% de obstrução de uma artéria epicárdica. RESULTADOS: Cento e quarenta e oito pacientes realizaram o EEDA e a angiografia coronariana. A média de idade foi de 52±9 anos, 69% eram do sexo masculino, 27% tinham nefropatia diabética, e 73%, HVE; 63% estavam assintomáticos, 36% e 22% apresentaram obstruções coronarianas > 50% e > 70%, respectivamente. A exeqüibilidade foi de 91% e houve 2,7% de complicações maiores. Obtiveram-se as seguintes médias de sensibilidade, especificidade e acurácia, considerando obstrução coronariana > 50%: 53% (IC:45-61, 87% (IC:81-93, e 75% (IC:63-83, respectivamente. Para obstrução >70%, 71% (IC:64-92, 85% (IC:79-91 e 81% (IC:75-87. A sensibilidade para diagnosticar doença uniarterial foi 41% (IC:19-63 e doença multiarterial, 78% (IC:64-92. CONCLUSÃO: O EEDA foi exeqüível e seguro; entretanto, foi ineficiente para rastreamento de DAC, considerando obstruções > 50%, mas pode ser útil para detecção de DAC em pacientes com obstruções > 70% e doença multiarterial.OBJECTIVE: To evaluate the feasibility, safety and accuracy of dobutamine/atropine stress echocardiography (DASE for the detection of coronary artery desease (CAD in renal transplant candidates. METHODS: Patients candidates to renal transplant were submitted consecutively to DASE and coronary angiography. The adopted angiographic criteria for CAD were an obstructive lesion of > 50% and > 70%. RESULTS: 148 patients underwent the DASE and the coronary angiography. Mean age was 52 ± 9 years, 69% of the patients were males; 27% had diabetic nephropathy
Central Clearing of OTC Derivatives
DEFF Research Database (Denmark)
Cont, Rama; Kokholm, Thomas
2014-01-01
netting agreements. When a CCP exists for interest rate derivatives, adding a CCP for credit derivatives is shown to decrease overall exposures. These findings are shown to be robust to the statistical assumptions of the model as well as the choice of risk measure used to quantify exposures....
Phosphorus derivatives of salicylic acid
Chvertkina, L. V.; Khoklov, P. S.; Mironov, Vladimir F.
1992-10-01
The present state of work on the methods of synthesis, chemical properties, and practical applications of phosphorus-containing derivatives of salicylic acid has been reviewed. The characteristics of the chemical transformations of cyclic and acyclic phosphorus derivatives of salicylic acid related to the coordination state of the phosphorus atom have been examined. The bibliography includes 158 references.
Nonholonomic constraints with fractional derivatives
Energy Technology Data Exchange (ETDEWEB)
Tarasov, Vasily E [Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119992 (Russian Federation); Zaslavsky, George M [Courant Institute of Mathematical Sciences, New York University, 251 Mercer St, New York, NY 10012 (United States)
2006-08-04
We consider the fractional generalization of nonholonomic constraints defined by equations with fractional derivatives and provide some examples. The corresponding equations of motion are derived using variational principle. We prove that fractional constraints can be used to describe the evolution of dynamical systems in which some coordinates and velocities are related to velocities through a power-law memory function.
Tame-wild dichotomy for derived categories
Bekkert, Viktor I.; Drozd, Yuriy A.
2003-01-01
We prove that every finite dimensional algebra over an algebraically closed field is either derived tame or derived wild. The proof is based on the technique of matrix problems (boxes and reduction algorithm). It implies, in particular, that any degeneration of a derived wild algebra is derived wild; respectively, any deformation of a derived tame algebra is derived tame.
Derivatives of Frobenius and Derivatives of Hodge weights
2016-01-01
In this paper we study the derivatives of Frobenius and the derivatives of Hodge weights for families of Galois representations with triangulations. We generalize the Fontaine-Mazur $\\CL$-invariant and use it to build a formula which is a generalization of the Greenberg-Stevens-Colmez formula. For the purpose of proving this formula we show two auxiliary results called projection vanishing property and "projection vanishing implying $\\CL$-invariants" property.
Cytochalasin derivatives from a jellyfish-derived fungus Phoma sp.
Kim, Eun La; Wang, Haibo; Park, Ju Hee; Hong, Jongki; Choi, Jae Sue; Im, Dong Soon; Chung, Hae Young; Jung, Jee H
2015-01-01
Four new cytochalasin derivatives (1-4), together with proxiphomin (5), were isolated from a jellyfish-derived fungus Phoma sp. The planar structures and relative stereochemistry were established by analysis of 1D and 2D NMR data. The absolute configuration was defined by the modified Mosher's method. The compounds showed moderate cytotoxicity against a small panel of human solid tumor cell lines (A549, KB, and HCT116).
Twisted derivations of Hopf algebras
Davydov, Alexei
2012-01-01
In the paper we introduce the notion of twisted derivation of a bialgebra. Twisted derivations appear as infinitesimal symmetries of the category of representations. More precisely they are infinitesimal versions of twisted automorphisms of bialgebras. Twisted derivations naturally form a Lie algebra (the tangent algebra of the group of twisted automorphisms). Moreover this Lie algebra fits into a crossed module (tangent to the crossed module of twisted automorphisms). Here we calculate this crossed module for universal enveloping algebras and for the Sweedler's Hopf algebra.
Jordan-H\\"older theorems for derived categories of derived discrete algebras
Qin, Yongyun
2015-01-01
For any positive integer $n$, $n$-derived-simple derived discrete algebras are classified up to derived equivalence. Furthermore, the Jordan-H\\"older theorems for all kinds of derived categories of derived discrete algebras are obtained.
Higher Derivatives and Canonical Formalism
HAMAMOTO, Shinji
1995-01-01
A canonical formalism for higher-derivative theories is presented on the basis of Dirac's method for constrained systems. It is shown that this formalism shares a path integral expression with Ostrogradski's canonical formalism.
View-based Propagator Derivation
Schulte, Christian
2009-01-01
When implementing a propagator for a constraint, one must decide about variants: When implementing min, should one also implement max? Should one implement linear constraints both with unit and non-unit coefficients? Constraint variants are ubiquitous: implementing them requires considerable (if not prohibitive) effort and decreases maintainability, but will deliver better performance than resorting to constraint decomposition. This paper shows how to use views to derive perfect propagator variants. A model for views and derived propagators is introduced. Derived propagators are proved to be indeed perfect in that they inherit essential properties such as correctness and domain and bounds consistency. Techniques for systematically deriving propagators such as transformation, generalization, specialization, and type conversion are developed. The paper introduces an implementation architecture for views that is independent of the underlying constraint programming system. A detailed evaluation of views implement...
Derivations of generalized Weyl algebras
Institute of Scientific and Technical Information of China (English)
SU; Yucai(苏育才)
2003-01-01
A class of the associative and Lie algebras A[D] = A × F[D] of Weyl type are studied, where Ais a commutative associative algebra with an identity element over a field F of characteristic zero, and F[D] isthe polynomial algebra of a finite dimensional commutative subalgebra of locally finite derivations of A suchthat A is D-simple. The derivations of these associative and Lie algebras are precisely determined.
Variational approach and deformed derivatives
Weberszpil, J.; Helayël-Neto, J. A.
2016-05-01
Recently, we have demonstrated that there exists a possible relationship between q-deformed algebras in two different contexts of Statistical Mechanics, namely, the Tsallis' framework and the Kaniadakis' scenario, with a local form of fractional-derivative operators for fractal media, the so-called Hausdorff derivatives, mapped into a continuous medium with a fractal measure. Here, in this paper, we present an extension of the traditional calculus of variations for systems containing deformed-derivatives embedded into the Lagrangian and the Lagrangian densities for classical and field systems. The results extend the classical Euler-Lagrange equations and the Hamiltonian formalism. The resulting dynamical equations seem to be compatible with those found in the literature, specially with mass-dependent and with nonlinear equations for systems in classical and quantum mechanics. Examples are presented to illustrate applications of the formulation. Also, the conserved Noether current is worked out.
Variational Approach and Deformed Derivatives
Weberszpil, José
2015-01-01
Recently, we have demonstrated that there exists a possible relationship between q-deformed algebras in two different contexts of Statistical Mechanics, namely, the Tsallis' framework and the Kaniadakis' scenario, with a local form of fractional-derivative operators for fractal media, the so-called Hausdorff derivatives, mapped into a continuous medium with a fractal measure. Here, in this paper, we present an extension of the traditional calculus of variations for systems containing deformed-derivatives embedded into the Lagrangian and the Lagrangian densities for classical and field systems. The results extend the classical Euler-Lagrange equations and the Hamiltonian formalism. The resulting dynamical equations seem to be compatible with those found in the literature, specially with mass-dependent and with nonlinear equations for systems in classical and quantum mechanics. Examples are presented to illustrate applications of the formulation. Also, the conserved Nether current, are worked out.
Sigman, Michael E.; Dindal, Amy B.
2003-11-11
Described is a method for producing copolymerized sol-gel derived sorbent particles for the production of copolymerized sol-gel derived sorbent material. The method for producing copolymerized sol-gel derived sorbent particles comprises adding a basic solution to an aqueous metal alkoxide mixture for a pH.ltoreq.8 to hydrolyze the metal alkoxides. Then, allowing the mixture to react at room temperature for a precalculated period of time for the mixture to undergo an increased in viscosity to obtain a desired pore size and surface area. The copolymerized mixture is then added to an immiscible, nonpolar solvent that has been heated to a sufficient temperature wherein the copolymerized mixture forms a solid upon the addition. The solid is recovered from the mixture, and is ready for use in an active sampling trap or activated for use in a passive sampling trap.
Bounded Densities and Their Derivatives
DEFF Research Database (Denmark)
Kozine, Igor; Krymsky, V.
2009-01-01
This paper describes how one can compute interval-valued statistical measures given limited information about the underlying distribution. The particular focus is on a bounded derivative of a probability density function and its combination with other available statistical evidence for computing...... quantities of interest. To be able to utilise the evidence about the derivative it is suggested to adapt the ‘conventional’ problem statement to variational calculus and the way to do so is demonstrated. A number of examples are given throughout the paper....
Risk Factors in Derivatives Markets
Directory of Open Access Journals (Sweden)
Raimonda Martinkutė-Kaulienė
2015-02-01
Full Text Available The objective of the article is to analyse and present the classification of risks actual to derivative securities. The analysis is based on classical and modern literature findings and analysis of newest statistical data. The analysis led to the conclusion, that the main risks typical for derivatives contracts and their traders are market risk, liquidity risk, credit and counterparty risk, legal risk and transactions risk. Pricing risk and systemic risk is also quite important. The analysis showed that market risk is the most important kind of risk that in many situations influences the level of remaining risks.
Fractional Derivatives in Dengue Epidemics
Pooseh, Shakoor; Rodrigues, Helena Sofia; Torres, Delfim F. M.
2011-09-01
We introduce the use of fractional calculus, i.e., the use of integrals and derivatives of non-integer (arbitrary) order, in epidemiology. The proposed approach is illustrated with an outbreak of dengue disease, which is motivated by the first dengue epidemic ever recorded in the Cape Verde islands off the coast of west Africa, in 2009. Numerical simulations show that in some cases the fractional models fit better the reality when compared with the standard differential models. The classical results are obtained as particular cases by considering the order of the derivatives to take an integer value.
Fractional derivatives in Dengue epidemics
Pooseh, Shakoor; Torres, Delfim F M
2011-01-01
We introduce the use of fractional calculus, i.e., the use of integrals and derivatives of non-integer (arbitrary) order, in epidemiology. The proposed approach is illustrated with an outbreak of dengue disease, which is motivated by the first dengue epidemic ever recorded in the Cape Verde islands off the coast of west Africa, in 2009. Numerical simulations show that in some cases the fractional models fit better the reality when compared with the standard differential models. The classical results are obtained as particular cases by considering the order of the derivatives to take an integer value.
Synthesis of Novel 3-Aryl Isoindolinone Derivatives
Institute of Scientific and Technical Information of China (English)
HU Chen-ming; ZHENG Lian-you; PEI Ya-zhong; BAI Xu
2013-01-01
A library of novel 3-aryl isoindolinone derivatives with aromatic amino acid derivative fragments was designed and synthesized.Two synthetic routes were employed to construct 3-aryl isoindolinone ring system for different amino acid derivatives.
Asymptotic aspect of derivations in Banach algebras.
Roh, Jaiok; Chang, Ick-Soon
2017-01-01
We prove that every approximate linear left derivation on a semisimple Banach algebra is continuous. Also, we consider linear derivations on Banach algebras and we first study the conditions for a linear derivation on a Banach algebra. Then we examine the functional inequalities related to a linear derivation and their stability. We finally take central linear derivations with radical ranges on semiprime Banach algebras and a continuous linear generalized left derivation on a semisimple Banach algebra.
DEFF Research Database (Denmark)
Grønbæk, Niels
2008-01-01
Let A be a Banach algebra and let X be a Banach A-bimodule. In studying H¹(A,X) it is often useful to extend a given derivation D: A->X to a Banach algebra B containing A as an ideal, thereby exploiting (or establishing) hereditary properties. This is usually done using (bounded/unbounded) approx......Let A be a Banach algebra and let X be a Banach A-bimodule. In studying H¹(A,X) it is often useful to extend a given derivation D: A->X to a Banach algebra B containing A as an ideal, thereby exploiting (or establishing) hereditary properties. This is usually done using (bounded....../unbounded) approximate identities to obtain the extension as a limit of operators b->D(ba)-b.D(a), a in A, in an appropriate operator topology, the main point in the proof being to show that the limit map is in fact a derivation. In this paper we make clear which part of this approach is analytic and which algebraic...... by presenting an algebraic scheme that gives derivations in all situations at the cost of enlarging the module. We use our construction to give improvements and shorter proofs of some results from the literature and to give a necessary and sufficient condition that biprojectivity and biflatness are inherited...
Derived Categories of BHK Mirrors
Favero, David
2016-01-01
We prove a derived analogue to the results of Borisov, Clarke, Kelly, and Shoemaker on the birationality of Berglund-Hubsch-Krawitz mirrors. Heavily bootstrapping off work of Seidel and Sheridan, we obtain Homological Mirror Symmetry for Berglund-Hubsch-Krawitz mirror pencils to hypersurfaces in projective space.
MCR Synthesis of Praziquantel Derivatives
Liu, Haixia; William, Samia; Herdtweck, Eberhardt; Botros, Sanaa; Domling, Alexander
2012-01-01
Schistosomiasis, a high volume neglected tropical disease affecting more than 200 million people worldwide, can only be effectively treated by the tetrahydroisoquinoline drug praziquantel (PZQ). Herein, we describe an efficient approach to access PZQ derivatives by the Ugi 4-component reaction follo
Antileishmanial activity of polycyclic derivatives
Directory of Open Access Journals (Sweden)
Sarciron M.E.
2005-09-01
Full Text Available 33 polycyclic derivatives have been studied and tested on Leishmania donovani and L. major promastigotes. Their antileishmanial activity was assessed in vitro and an assay of their cytotoxicity was realized on human myelomonocytic cell line. The reference molecules used in the assays were amphotericin B and pentamidine. Among the compounds tested, 29 possess an antileishmanial activity; 25 of those were more active against L. donovani than amphotericin B, and nine were as effective as amphotericin B against L. major. Many synthesized derivatives were more active against L.donovani than against L. major. The cytotoxicity studies have shown that among the thirty-three derivatives tested, 12 molecules have an IC50 towards THP-1 cells about equal than that reference drugs, the 21 other derivatives are much less toxic. A 3D QSAR study was undertaken and has permitted to predict activity against L. donovani and L. major and to highlight critical area to optimize activity against the two species.
Derivations of certain operator algebras
Directory of Open Access Journals (Sweden)
Jiankui Li
2000-01-01
conditions under which any derivation δ from into L(H must be inner. The conditions include (1 H−≠H, (2 0+≠0, (3 there is a nontrivial projection in which is in , and (4 δ is norm continuous. We also give some pplications.
Starches and their sugar derivatives
Energy Technology Data Exchange (ETDEWEB)
Leroy, P. (Societe Roquette Freres, 62 - Lestrem (France))
1982-12-01
After reviewing the composition of natural starches and their uses, the author deals with starch transformation processes, either by physical processing or chemical treatment. He describes particularly the various starch hydrolysis products together with their derivatives, amongst which are sought products which could replace sugar.
On Generalized Derivations in Nearrings
Directory of Open Access Journals (Sweden)
Mohd Rais Khan
2013-01-01
Full Text Available The aim of this paper is to investigate some results of nearrings satisfying certain identities involving generalized derivations. Furthermore, we give some examples to demonstrate the restrictions imposed on the hypothesis of various results which are not superfluous.
Derivative couplings in massive bigravity
Gao, Xian
2016-01-01
In this work we study the cosmological perturbations in massive bigravity in the presence of non-minimal derivative couplings. For this purpose we consider a specific subclass of Horndeski scalar-tensor interactions that live on the unique composite effective metric. For the viability of the model both metrics have to be dynamical. Nevertheless, the number of allowed kinetic terms is crucial. We adapt to the restriction of having one single kinetic term. After deriving the full set of equations of motion for flat Friedmann-Lemaitre-Robertson-Walker background, we study linear perturbations on top of it. We show explicitly that only four tensor, two vector and two scalar degrees of freedom propagate, one of which being the Horndeski scalar, while the Boulware-Deser ghost can be integrated out.
Derivative couplings in massive bigravity
Gao, Xian; Heisenberg, Lavinia
2016-03-01
In this work we study the cosmological perturbations in massive bigravity in the presence of non-minimal derivative couplings. For this purpose we consider a specific subclass of Horndeski scalar-tensor interactions that live on the unique composite effective metric. For the viability of the model both metrics have to be dynamical. Nevertheless, the number of allowed kinetic terms is crucial. We adapt to the restriction of having one single kinetic term. After deriving the full set of equations of motion for flat Friedmann-Lemaitre-Robertson-Walker background, we study linear perturbations on top of it. We show explicitly that only four tensor, two vector and two scalar degrees of freedom propagate, one of which being the Horndeski scalar, while the Boulware-Deser ghost can be integrated out.
Synthese asymetrique glycidol et derives
2014-01-01
La steereochilie (derive du grec ,singnifiant solide ) se refere a la chimie en trois dimensions(1) puisque la plupart des molecules sont tridimensionnelles, la stereochimie s'insere de fait dans pratiquement toute la chimie dans l'evaluation de la pensée chimique ,le concept de la sereochimie est venu relativement tard , une grande paati de la chimie ,souvent excellente de 19éme siecle, l'ingnore .
Clearing and settlement of exchange traded derivatives
John McPartland
2009-01-01
Derivatives are a class of financial instruments that derive their value from some underlying commodity, security, index, or other asset. Futures and options are common forms of derivatives. This article explains how clearing and settlement systems for exchange traded derivatives work.
Kumar, P; Swami, D; Nagar, D P; Singh, K P; Acharya, J; Karade, H N; Yadav, R
2017-01-01
The study reports antidotal efficacy of three HNK [ bis quaternary 2-(hydroxyimino)-N-(pyridin-3yl) acetamide derivatives] and pralidoxime (2-PAM), against soman and tabun poisoning in Swiss albino mice. Protection index (PI) was determined (treatment doses: HNK oximes, ×0.20 of their median lethal dose (LD50) and 2-PAM, 30 mg/kg, intramuscularly (im)) together with atropine (10 mg/kg, intraperitoneally). Probit log doses with difference of 0.301 log of LD50 of the nerve agents administered and inhibition of acetylcholinesterase (AChE) activity by 50% (IC50) was calculated at optimized time in brain and serum. Using various doses of tabun and soman (subcutaneously (sc)), in multiples of their IC50, AChE reactivation ability of the oximes was studied. Besides, acute toxicity (0.8× LD50, im, 24 h postexposure) of HNK-102 and 2-PAM was also compared by determining biochemical, hematological variables and making histopathological observations. Protection offered by HNK-102 against tabun poisoning was found to be four times higher compared to 2-PAM. However, nearly equal protection was noted with all the four oximes against soman poisoning. HNK-102 reactivated brain AChE activity by 1.5 times more than 2-PAM at IC50 dose of soman and tabun. Acute toxicity studies of HNK-102 and 2-PAM showed sporadic changes in urea, uric acid, aspartate aminotransferase, and so on compared to control group, however, not supported by histopathological investigations. The present investigation showed superiority of newly synthesized HNK-102 oxime over standard 2-PAM, as a better antidote, against acute poisoning of tabun (4.00 times) and soman (1.04 times), in Swiss albino mice.
Derivation of Hamiltonians for accelerators
Energy Technology Data Exchange (ETDEWEB)
Symon, K.R.
1997-09-12
In this report various forms of the Hamiltonian for particle motion in an accelerator will be derived. Except where noted, the treatment will apply generally to linear and circular accelerators, storage rings, and beamlines. The generic term accelerator will be used to refer to any of these devices. The author will use the usual accelerator coordinate system, which will be introduced first, along with a list of handy formulas. He then starts from the general Hamiltonian for a particle in an electromagnetic field, using the accelerator coordinate system, with time t as independent variable. He switches to a form more convenient for most purposes using the distance s along the reference orbit as independent variable. In section 2, formulas will be derived for the vector potentials that describe the various lattice components. In sections 3, 4, and 5, special forms of the Hamiltonian will be derived for transverse horizontal and vertical motion, for longitudinal motion, and for synchrobetatron coupling of horizontal and longitudinal motions. Hamiltonians will be expanded to fourth order in the variables.
Generalized derivations and general relativity
Heller, M; Pysiak, L; Sasin, W
2013-01-01
We construct differential geometry (connection, curvature, etc.) based on generalized derivations of an algebra A. Such a derivation, introduced by Bresar in 1991, is given by a linear mapping u: A -> A such that there exists a usual derivation d of A satisfying the generalized Leibniz rule u(a b) = u(a) b + a d(b) for all a,b in A. The generalized geometry "is tested" in the case of the algebra of smooth functions on a manifold. We then apply this machinery to study the generalized general relativity. We define the Einstein-Hilbert action and deduce from it Einstein's field equations. We show that for a special class of metrics containing, besides the usual metric components, only one non-zero term, the action reduces to O'Hanlon action that is a Brans-Dicke action with potential and with the parameter \\omega equal to zero. We also show that the generalized Einstein equations (with zero energy-stress tensor) are equivalent to those of the Kaluza-Klein theory satisfying a "modified cylinder condition" and hav...
Indian Academy of Sciences (India)
Niels Grønbæk
2008-05-01
Let $\\mathfrak{A}$ be a Banach algebra and let be a Banach $\\mathfrak{A}$-bimodule. In studying $\\mathcal{H}^1(\\mathfrak{A},X)$ it is often useful to extend a given derivation $D:\\mathfrak{A}→ X$ to a Banach algebra $\\mathfrak{B}$ containing $\\mathfrak{A}$ as an ideal, thereby exploiting (or establishing) hereditary properties. This is usually done using (bounded/unbounded) approximate identities to obtain the extension as a limit of operators $b\\mapsto D(ba)-b.D(a), a\\in\\mathfrak{A}$ in an appropriate operator topology, the main point in the proof being to show that the limit map is in fact a derivation. In this paper we make clear which part of this approach is analytic and which algebraic by presenting an algebraic scheme that gives derivations in all situations at the cost of enlarging the module. We use our construction to give improvements and shorter proofs of some results from the literature and to give a necessary and sufficient condition that biprojectivity and biflatness is inherited to ideals.
Whither the common law derivative action
Yap, JL
2009-01-01
The common law derivative action was developed as a result of decades of case law in common law jurisdictions. Hong Kong and Singapore continue to retain the common law derivative action within their respective legal frameworks, despite both having enacted statutory derivative actions. This paper considers the situations in which the common law derivative action continues to have practical application in each of these jurisdictions. It then considers whether the common law derivative acti...
Noether theorems and higher derivatives
Townsend, Paul K
2016-01-01
A simple proof of Noether's first theorem involves the promotion of a constant symmetry parameter $\\epsilon$ to an arbitrary function of time; the Noether charge $Q$ is then the coefficient of $\\dot\\epsilon$ in the variation of the action. Here we examine the validity of this proof for Lagrangian mechanics with arbitrarily-high time derivatives, in which context "higher-level" analogs of Noether's theorem can be similarly proved, and "Noetherian charges" read off from, e.g. the coefficient of $\\ddot \\epsilon$ in the variation of the action. While $Q=0$ implies a restricted gauge invariance, an unrestricted gauge invariance requires zero Noetherian charges too. Some illustrative examples are considered.
Mechanized derivation of linear invariants.
Cavender, J A
1989-05-01
Linear invariants, discovered by Lake, promise to provide a versatile way of inferring phylogenies on the basis of nucleic acid sequences (the method that he called "evolutionary parsimony"). A semigroup of Markov transition matrices embodies the assumptions underlying the method, and alternative semigroups exist. The set of all linear invariants may be derived from the semigroup by using an algorithm described here. Under assumptions no stronger than Lake's, there are greater than 50 independent linear invariants for each of the 15 rooted trees linking four species.
Stable Hemiaminals: 2-Aminopyrimidine Derivatives
Directory of Open Access Journals (Sweden)
Anna Kwiecień
2015-08-01
Full Text Available Stable hemiaminals can be obtained in the one-pot reaction between 2-aminopyrimidine and nitrobenzaldehyde derivatives. Ten new hemiaminals have been obtained, six of them in crystal state. The molecular stability of these intermediates results from the presence of both electron-withdrawing nitro groups as substituents on the phenyl ring and pyrimidine ring, so no further stabilisation by intramolecular interaction is required. Hemiaminal molecules possess a tetrahedral carbon atom constituting a stereogenic centre. As the result of crystallisation in centrosymmetric space groups both enantiomers are present in the crystal structure.
Synthesis of oleanolic disaccharide derivatives
Institute of Scientific and Technical Information of China (English)
Shu Chen Pei; Jian Bo Wu; Fan Lei; Shan Qian; Li Hai; Yong Wu
2012-01-01
Oleanolic acid 1 exists widely in food,medicinal herbs and other plants and possesses many attractive biological activities.Recently,some oleanolic derivatives were reported to have interesting anti-tumor activities.Herein,using association principle of drug design,OA disaccharide 17 was designed and synthesized by coupling α-L-rhamnopyranosyl-(1→2)-α-L-arabinopyranosyl disaccharide moiety,which has proved to be a unique sugar sequence with strongly antitumor activity,and modified OA with a nitrile at C-17.
Cosmology with Nonminimal Derivative Couplings
Amendola, L
1993-01-01
We study a theory which generalizes the nonminimal coupling of matter to gravity by including derivative couplings. This leads to several interesting new dynamical phenomena in cosmology. In particular, the range of parameters in which inflationary attractors exist is greatly expanded. We also numerically integrate the field equations and draw the phase space of the model in second order approximation. The model introduced here may display different inflationary epochs, generating a non-scale-invariant fluctuation spectrum without the need of two or more fields. Finally, we comment on the bubble spectrum arising during a first-order phase transition occurring in our model.
Hypoxic radiosensitizers: substituted styryl derivatives.
Nudelman, A; Falb, E; Odesa, Y; Shmueli-Broide, N
1994-10-01
A number of novel styryl epoxides, N-substituted-styryl-ethanolamines, N-mono and N,N'-bis-(2-hydroxyethyl)-cinnamamides--analogues to the known radiosensitizers RSU-1069, pimonidazole and etanidazole--display selective hypoxic radiosensitizing activity. The styryl group, especially when substituted by electron withdrawing groups, was found to be bioisosteric to the nitroimidazolyl functionality. The most active derivative 2-(2'-nitrophenyl)ethen-1-yl-oxirane 8a displayed a sensitizer enhancement ratio (SER) of 5 relative to misonidazole.
Asymptotic vacua with higher derivatives
Energy Technology Data Exchange (ETDEWEB)
Cotsakis, Spiros, E-mail: skot@aegean.gr [Department of Mathematics, American University of the Middle East, P.O. Box 220 Dasman, 15453 (Kuwait); Kadry, Seifedine, E-mail: Seifedine.Kadry@aum.edu.kw [Department of Mathematics, American University of the Middle East, P.O. Box 220 Dasman, 15453 (Kuwait); Kolionis, Georgios, E-mail: gkolionis@aegean.gr [Research group of Geometry, Dynamical Systems and Cosmology, University of the Aegean, Karlovassi 83200, Samos (Greece); Tsokaros, Antonios, E-mail: atsok@aegean.gr [Research group of Geometry, Dynamical Systems and Cosmology, University of the Aegean, Karlovassi 83200, Samos (Greece)
2016-04-10
We study limits of vacuum, isotropic universes in the full, effective, four-dimensional theory with higher derivatives. We show that all flat vacua as well as general curved ones are globally attracted by the standard, square root scaling solution at early times. Open vacua asymptote to horizon-free, Milne states in both directions while closed universes exhibit more complex logarithmic singularities, starting from initial data sets of a possibly smaller dimension. We also discuss the relation of our results to the asymptotic stability of the passage through the singularity in ekpyrotic and cyclic cosmologies.
Asymptotic vacua with higher derivatives
Directory of Open Access Journals (Sweden)
Spiros Cotsakis
2016-04-01
Full Text Available We study limits of vacuum, isotropic universes in the full, effective, four-dimensional theory with higher derivatives. We show that all flat vacua as well as general curved ones are globally attracted by the standard, square root scaling solution at early times. Open vacua asymptote to horizon-free, Milne states in both directions while closed universes exhibit more complex logarithmic singularities, starting from initial data sets of a possibly smaller dimension. We also discuss the relation of our results to the asymptotic stability of the passage through the singularity in ekpyrotic and cyclic cosmologies.
DEFF Research Database (Denmark)
Toyserkani, Navid Mohamadpour; Quaade, Marlene Louise; Sheikh, Søren Paludan
2015-01-01
Emerging evidence has shown that adipose tissue is the richest and most accessible source of mesenchymal stem cells. Many different therapies for chronic wounds exist with varying success rates. The capacity of adipose-derived stem cells (ASCs) to promote angiogenesis, secrete growth factors......, regulate the inflammatory process, and differentiate into multiple cell types makes them a potential ideal therapy for chronic wounds. The aim of this article was to review all preclinical trials using ASCs in problem wound models. A systematic search was performed and 12 studies were found where different...
Boynton, R J; M. A. Balikhin; S. A. Billings; Sharma, A.S.; Amariutei, O.A
2011-01-01
The NARMAX OLS-ERR methodology is applied to identify a mathematical model for the dynamics of the Dst index. The NARMAX OLS-ERR algorithm, which is widely used in the field of system identification, is able to identify a mathematical model for a wide class of nonlinear systems using input and output data. Solar wind-magnetosphere coupling functions, derived from analytical or data based methods, are employed as the inputs to such models and the outputs are geomagnetic indices. The newly dedu...
Relative Derived Equivalences and Relative Homological Dimensions
Institute of Scientific and Technical Information of China (English)
Sheng Yong PAN
2016-01-01
Let A be a small abelian category. For a closed subbifunctor F of Ext1A (−,−), Buan has generalized the construction of Verdier’s quotient category to get a relative derived category, where he localized with respect to F-acyclic complexes. In this paper, the homological properties of relative derived categories are discussed, and the relation with derived categories is given. For Artin algebras, using relative derived categories, we give a relative version on derived equivalences induced by F-tilting complexes. We discuss the relationships between relative homological dimensions and relative derived equivalences.
Deriving Laws from Ordering Relations
Knuth, Kevin H.
2004-01-01
The effect of Richard T. Cox's contribution to probability theory was to generalize Boolean implication among logical statements to degrees of implication, which are manipulated using rules derived from consistency with Boolean algebra. These rules are known as the sum rule, the product rule and Bayes Theorem, and the measure resulting from this generalization is probability. In this paper, I will describe how Cox s technique can be further generalized to include other algebras and hence other problems in science and mathematics. The result is a methodology that can be used to generalize an algebra to a calculus by relying on consistency with order theory to derive the laws of the calculus. My goals are to clear up the mysteries as to why the same basic structure found in probability theory appears in other contexts, to better understand the foundations of probability theory, and to extend these ideas to other areas by developing new mathematics and new physics. The relevance of this methodology will be demonstrated using examples from probability theory, number theory, geometry, information theory, and quantum mechanics.
Penetratin and derivatives acting as antifungal agents
Masman, Marcelo F.; Rodriguez, Ana M.; Raimondi, Marcela; Zacchino, Susana A.; Luiten, Paul G. M.; Somlai, Csaba; Kortvelyesi, Tamas; Penke, Botond; Enriz, Ricardo D.
2009-01-01
The synthesis, in vitro evaluation, and conformational study of RQIKTWFQNRRMKWKK-NH(2) (penetratin) and related derivatives acting as antifungal agents are reported. Penetratin and some of its derivatives displayed antifungal activity against the human opportunistic pathogenic standardized ATCC stra
Derived bracket construction up to homotopy
Uchino, K
2012-01-01
We will introduce the notion of higher derived bracket construction in the category of operads and prove that the higher derived bracket construction of Lie operad is equivalent with the cobar construction of Leibniz operad.
Higgs Potential from Derivative Interactions
Quadri, A
2016-01-01
A formulation of the linear $\\sigma$ model with derivative interactions is studied. The theory is on-shell equivalent to the model with a quartic Higgs potential. The mass of the scalar mode only appears in the quadratic part and not in the interaction vertices, unlike in the ordinary formulation of the theory. Renormalization of the model is discussed. A natural non power-counting renormalizable extension of the theory is presented. The model is physically equivalent to the inclusion of a dimension six effective operator $\\partial_\\mu (\\Phi^\\dagger \\Phi) \\partial^\\mu (\\Phi^\\dagger \\Phi)$. The resulting UV divergences are arranged in a perturbation series around the power-counting renormalizable theory. UV completion of the non-power-counting renormalizable model through a symmetric deformation of the propagator of the massive physical scalar is addressed.
Iron and iron derived radicals
Energy Technology Data Exchange (ETDEWEB)
Borg, D.C.; Schaich, K.M.
1987-04-01
We have discussed some reactions of iron and iron-derived oxygen radicals that may be important in the production or treatment of tissue injury. Our conclusions challenge, to some extent, the usual lines of thought in this field of research. Insofar as they are born out by subsequent developments, the lessons they teach are two: Think fastexclamation Think smallexclamation In other words, think of the many fast reactions that can rapidly alter the production and fate of highly reactive intermediates, and when considering the impact of competitive reactions on such species, think how they affect the microenvironment (on the molecular scale) ''seen'' by each reactive molecule. 21 refs., 3 figs., 1 tab.
Nielsen, H B
2014-01-01
This attempt to "derive" space is part of the Random Dynamics project. The Random Dynamics philosophy is that what we observe at our low energy level can be interpreted as some Taylor tail of the physics taking place at a higher energy level, and all the concepts like numbers, space, symmetry, as well as the known physical laws, emerge from a "fundamental world machinery" being a most general, random mathematical structure. Here we concentrate on obtaining spacetime in such a Random Dynamics way. Because of quantum mechanics, we get space identified with about half the dimension of the phase space of a very extended wave packet, which we call "the Snake". In the last section we also explain locality from diffeomorphism symmetry.
Silsesquioxane-derived ceramic fibres
Hurwitz, F. I.; Farmer, S. C.; Terepka, F. M.; Leonhardt, T. A.
1991-01-01
Fibers formed from blends of silsesquioxane polymers were characterized to study the pyrolytic conversion of these precursors to ceramics. The morphology of fibers pyrolyzed to 1400 C revealed primarily amorphous glasses whose conversion to beta-SiC is a function of both blend composition and pyrolysis conditions. Formation of beta-SiC crystallites within the glassy phase is favored by higher than stoichiometric C/Si ratios, while carbothermal reduction of Si-O bonds to form SiC with loss of SiO and CO occurs at higher methyl/phenylpropyl silsesquioxane (lower C/Si) ratios. As the carbothermal reduction is assumed to be diffusion controlled, the fibers can serve as model systems to gain understanding of the silsesquioxane pyrolysis behavior, and therefore are useful in the development of polysilsesquioxane-derived ceramic matrices and coatings as well.
Topological Derivatives in Shape Optimization
Novotny, Antonio André
2013-01-01
The topological derivative is defined as the first term (correction) of the asymptotic expansion of a given shape functional with respect to a small parameter that measures the size of singular domain perturbations, such as holes, inclusions, defects, source-terms and cracks. Over the last decade, topological asymptotic analysis has become a broad, rich and fascinating research area from both theoretical and numerical standpoints. It has applications in many different fields such as shape and topology optimization, inverse problems, imaging processing and mechanical modeling including synthesis and/or optimal design of microstructures, sensitivity analysis in fracture mechanics and damage evolution modeling. Since there is no monograph on the subject at present, the authors provide here the first account of the theory which combines classical sensitivity analysis in shape optimization with asymptotic analysis by means of compound asymptotic expansions for elliptic boundary value problems. This book is intende...
Financial Derivatives (Based on Two Supports Evaluation
Directory of Open Access Journals (Sweden)
Tiberiu Socaciu
2011-10-01
Full Text Available In this paper we build a PDE like Black-Scholes equation in hypothesis of a financial derivative that is dependent on two supports (usual is dependent only on one support, like am
option based on gold, when national currency has a great float.
Keywords: Financial derivatives, derivatives evaluation, derivatives based on two supports, extended Itō like lemma.
Polymer-Derived Ceramic Fibers
Ichikawa, Hiroshi
2016-07-01
SiC-based ceramic fibers are derived from polycarbosilane or polymetallocarbosilane precursors and are classified into three groups according to their chemical composition, oxygen content, and C/Si atomic ratio. The first-generation fibers are Si-C-O (Nicalon) fibers and Si-Ti-C-O (Tyranno Lox M) fibers. Both fibers contain more than 10-wt% oxygen owing to oxidation during curing and lead to degradation in strength at temperatures exceeding 1,300°C. The maximum use temperature is 1,100°C. The second-generation fibers are SiC (Hi-Nicalon) fibers and Si-Zr-C-O (Tyranno ZMI) fibers. The oxygen content of these fibers is reduced to less than 1 wt% by electron beam irradiation curing in He. The thermal stability of these fibers is improved (they are stable up to 1,500°C), but their creep resistance is limited to a maximum of 1,150°C because their C/Si atomic ratio results in excess carbon. The third-generation fibers are stoichiometric SiC fibers, i.e., Hi-Nicalon Type S (hereafter Type S), Tyranno SA, and Sylramic™ fibers. They exhibit improved thermal stability and creep resistance up to 1,400°C. Stoichiometric SiC fibers meet many of the requirements for the use of ceramic matrix composites for high-temperature structural application. SiBN3C fibers derived from polyborosilazane also show promise for structural applications, remain in the amorphous state up to 1,800°C, and have good high-temperature creep resistance.
On the objectivity of time derivatives
Directory of Open Access Journals (Sweden)
Matolcsi, Tamas
2008-02-01
Full Text Available A four-dimensional treatment of nonrelativistic space-time gives a natural frame to deal with objective time derivatives. In this framework some well known objective time derivatives of continuum mechanics appear as Lie-derivatives. Their coordinatized forms depends on the tensorial properties of the relevant physical quantities.
6 CFR 7.26 - Derivative classification.
2010-01-01
... amended, 32 CFR 2001.22, and internal DHS guidance provided by the Chief Security Officer. ... 6 Domestic Security 1 2010-01-01 2010-01-01 false Derivative classification. 7.26 Section 7.26... INFORMATION Classified Information § 7.26 Derivative classification. (a) Derivative classification is...
32 CFR 2001.22 - Derivative classification.
2010-07-01
... 32 National Defense 6 2010-07-01 2010-07-01 false Derivative classification. 2001.22 Section 2001... Identification and Markings § 2001.22 Derivative classification. (a) General. Information classified derivatively on the basis of source documents or classification guides shall bear all markings prescribed...
CPHD filter derivation for extended targets
Orguner, Umut
2010-01-01
This document derives the CPHD filter for extended targets. Only the update step is derived here. Target generated measurements, false alarms and prior are all assumed to be independent identically distributed cluster processes. We also prove here that the derived CPHD filter for extended targets reduce to PHD filter for extended targets and CPHD filter for standard targets under suitable assumptions.
12 CFR 563.172 - Financial derivatives.
2010-01-01
... underlying assets, indices, or reference rates. The most common types of financial derivatives are futures, forward commitments, options, and swaps. A mortgage derivative security, such as a collateralized mortgage... Interest Rate Risk, Investment Securities, and Derivatives Activities,” and other applicable...
Derivations and identities for Kravchuk polynomials
Bedratyuk, Leonid
2012-01-01
We introduce the notion of Kravchuk derivations of the polynomial algebra. We prove that any element of the kernel of the derivation gives a polynomial identity satisfied by the Kravchuk polynomials. Also, we prove that any kernel element of the basic Weitzenb\\"ok derivations yields a polynomial identity satisfied by the Kravchuk polynomials. We describe the corresponding intertwining maps.
Covariant derivative of fermions and all that
Shapiro, Ilya L
2016-01-01
We present detailed pedagogical derivation of covariant derivative of fermions and some related expressions, including commutator of covariant derivatives and energy-momentum tensor of a free Dirac field. The text represents a part of the initial chapter of a one-semester course on semiclassical gravity.
Bioactive Terpenes from Marine-Derived Fungi
Directory of Open Access Journals (Sweden)
Ahmed M. Elissawy
2015-04-01
Full Text Available Marine-derived fungi continue to be a prolific source of secondary metabolites showing diverse bioactivities. Terpenoids from marine-derived fungi exhibit wide structural diversity including numerous compounds with pronounced biological activities. In this review, we survey the last five years’ reports on terpenoidal metabolites from marine-derived fungi with particular attention on those showing marked biological activities.
Bioactive terpenes from marine-derived fungi.
Elissawy, Ahmed M; El-Shazly, Mohamed; Ebada, Sherif S; Singab, AbdelNasser B; Proksch, Peter
2015-04-03
Marine-derived fungi continue to be a prolific source of secondary metabolites showing diverse bioactivities. Terpenoids from marine-derived fungi exhibit wide structural diversity including numerous compounds with pronounced biological activities. In this review, we survey the last five years' reports on terpenoidal metabolites from marine-derived fungi with particular attention on those showing marked biological activities.
Jordan Higher Derivable Mappings on Rings
Directory of Open Access Journals (Sweden)
Mohammad Ashraf
2014-01-01
Full Text Available Let R be a ring. We say that a family of maps D={dn}n∈N is a Jordan higher derivable map (without assumption of additivity on R if d0=IR (the identity map on R and dn(ab+ba=∑p+q=ndp(adq(b+∑p+q=ndp(bdq(a hold for all a,b∈R and for each n∈N. In this paper, we show that every Jordan higher derivable map on a ring under certain assumptions becomes a higher derivation. As its application, we get that every Jordan higher derivable map on Banach algebra is an additive higher derivation.
Shock wave dynamics derivatives and related topics
Emanuel, George
2012-01-01
Working knowledge of the relations of various quantities and their derivatives across a shock wave is useful for any advanced research involving shock waves. Although these relations can be derived in principle by any diligent student of the subject, the derivations are often not trivial, and once derived, neither the approach nor the result can be confidently verified. Comprehensive and analytical, Shock Wave Dynamics: Derivatives and Related Topics includes not only the final results but also the methods, which are of great practical value as examples of mathematical procedure in this field.
Time derivative of earthquake acceleration
Institute of Scientific and Technical Information of China (English)
Mai Tong; Guo-Quan Wang; George C.Lee
2005-01-01
Unlike acceleration, velocity, and displacement, the time derivative of acceleration (TDoA) of ground motion has not been extensively studied. In this paper, the basic characteristics of TDoA are evaluated based on records from the 1999Chi-Chi, earthquake (Mw 7.6) and one of its aftershocks (Mw 6.2). It is found that the maximum TDoA at a free-field station was over 31,200 crm/s3 (31.8 g/s); and the duration of "strong" TDoA, between the first and the last time points exceeding 2,000 cm/s3 (2 g/s), was almost one minute near the epicenter area. Since ground TDoA sensors are not commonly available,the time series are calculated by direct numerical differentiation of acceleration time series. Relative error analysis shows that the error is non-transitive and total error is within 4%. The density function of TDoA amplitude, frequency content and spatial distribution of peak ground jerk (PGJ) are evaluated. The study also includes examination of some TDoA responses from a seven-story building and comparison of ground TDoA with the limit TDoA used in the transportation industry for ride comfort. Some potential impacts of TDoA on humans have also been reviewed.
Option Derivatives in Electricity Hedging
Directory of Open Access Journals (Sweden)
P. Pavlátka
2010-01-01
Full Text Available Despite the high volatility of electricity prices, there is still little demand for electricity power options, and the liquidity on the power exchanges of these power derivatives is quite low. One of the reasons is the uncertainty about how to evaluate these electricity options and about finding the right fair value of this product. Hedging of electricity is associated mainly with products such as futures and forwards. However, due to new trends in electricity trading and hedging, it is also useful to think more about options and the principles for working with them in hedging various portfolio positions and counterparties. We can quite often encounter a situation when we need to have a perfect hedge for our customer’s (end user consuming electricity portfolio, or we have to evaluate the volumetric risk (inability of a customer to predict consumption, which is very similar to selling options. Now comes the moment to compare the effects of using options or futures to hedge these open positions. From a practical viewpoint, the Black-Scholes prices appear to be the best available and the simplest method for evaluating option premiums, but there are some limitations that we have to consider.
Animal-derived pharmaceutical proteins.
Redwan, el-Rashdy M
2009-01-01
Livestock animals have made a significant contribution to human health and well-being throughout humankind's history. A significant contribution of farm animals to human health are the longstanding use of bovine and porcine for production of insulin (for treatment of diabetes), gelatin (for pharmaceutical and other purposes), as well as horse and sheep antibody against natural venoms, toxins, drugs and microbial peptides. Gelatin being the biggest animal protein consumed in human health, follows with antibodies fragments. The chronic problem of animal-derived therapeutics, especially those of high molecular weight, is the immunogenicity induction in addition to their biosafety. However, the invertebrates and lower vertebrates donate the human being a several crucial emergency saving life small-peptides or their analogs such as Refludan, Prialt, Exendin. Not only, but the farm animals are enormously using as models for novel surgical strategies, testing of biodegradable implants and sources of tissue replacements, such as skin and heart valves. Recently, they are being harnessing as bioreactor for production of biopharmaceutical related products through gene farming with efficiency far greater than any conventional microbial or cell-culture production systems. Only 16 transgenic cows would be covering the worldwide needs from human growth hormone. The transgenic, especially animal, technology would be solving a several biopharmaceutical products disadvantages, such as cost, biosafety, immunogenicity and the availability dimensions.
21 CFR 184.1685 - Rennet (animal-derived) and chymosin preparation (fermentation-derived).
2010-04-01
... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Rennet (animal-derived) and chymosin preparation (fermentation-derived). 184.1685 Section 184.1685 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF... (animal-derived) and chymosin preparation (fermentation-derived). (a)(1) Rennet and bovine rennet...
Vasoactive and radioprotective properties of isothiourea derivatives having NOS-inhibitory activity
Energy Technology Data Exchange (ETDEWEB)
Filimonova, Marina V.; Shevchenko, Ludmila I.; Ulyanenko, Stepan E.; Makarchuk, Victorya M.; Kuznetsova, Mary N.; Shevchuk, Aza S.; Lushnikova, Galina A.; Chesnakova, Ekaterina A. [Medical Radiological Research Center Health Ministry of Russia, 4, Korolev street, Obninsk, 249036, Kaluga region (Russian Federation)
2014-07-01
We studied vasoactive and radioprotective properties of new original N-acyl, S-alkyl isothiourea derivatives which are potent inhibitors of nitric oxide synthases (preferably eNOS and iNOS). These compounds have a moderate toxicity (LD50 - 400-550 mg/kg), and are stable in aqueous solutions. In hemodynamic studies, these compounds exhibited high vasotropic activity. The use of these compounds in doses of 5-15 mg/kg (0,01-0,03 LD{sub 50}) in the experimental animals in a state of the severe hemorrhagic or endo-toxic shock causes a potent vasopressor effect, accompanied by a significant and continuous rise in blood pressure. The increasing of vascular tone developed over 2-5 min after injection and persisted for at least 60-90 minutes, excelling at least 3-5 times the duration of α1-adreno-mimetic vasopressor action. The rapid increase in vascular tone under the influence of these compounds in normo-tonic animals caused protective baroreflex to prevent high blood pressure. At doses of 10-15 mg/kg the reflex reaction was mild, but at higher doses (30-40 mg/kg) the reaction was fierce and prolonged, and was accompanied by severe bradycardia, decreasing of the cardiac output and a significant weakening of the peripheral blood flow. In all cases, the hemodynamic response was reflexive and easily eliminated by atropine. The ability of these compounds to induce circulatory hypoxia was the basis for the study of their radioprotective properties. The study of radioprotective effect on the survival of animals exposed to lethal doses of γ-radiation (10 Gy) and on the survival of hematopoietic clonogenic cells showed that these compounds in doses of 80-150 mg/kg (0,2-0,3 LD50) have considerable radioprotective action, which is comparable with the protective effect of the maximum tolerated dose of cystamine. The factor of change in dose for γ-radiation, estimated by the LD{sub 50}, was 1,42-1,58. We also investigated the ability of the test compounds, due to their hypoxic
Die derivation der slowenischen substantive
Directory of Open Access Journals (Sweden)
]ože Toporišič
1975-11-01
Full Text Available Von der traditionellen slowenischen Wortbildungslehre von Substantiven mit den Suffixen (s. g. Derivation wird die betreffende Problematik so dargestellt, dass man - nach Miklošič's Vorbild - von Suffixen mit einem charakteristischen Konsonanten (oder mit eine charakteristischen Konsonantengruppe aus gehend bei verschiedenen Wortartbasen (Zeitwort, Adjektiv, Substantiv die semantischen kategorien von Wortbildungen mit »demselben« Suffix aufzählt. Aber schon bei A. Bajec (Besedotvorje slovenskega jezika, 1950 findet man auch das Kapitel »Die Suffixe nach ihren Bedeutungen, worin Suffixe für 24 Bedeutungsgruppen festgehalten sind. In der Slovenska slovnica (1956 gibt es 16, im Slovenski knjižni jezik 2 (1966 aber 13 solcher Gruppen von Suffixen. Der vorliegende Ausatz geht ebenfalls von den semantischen Kategorien aus, versucht aber die Zahl der Bedeutungskategorien, die aus verhalen, adjekvsehen oder substantiviseher Basen mit Hilfe von Suffixen gebildet werden, auf 6 grosse Gruppen zu reduzieren. Diese 6 Gruppen sind: 1. die Namen der Agenten, des Eigenschaftstragers und der Verbundenheit; 2. die Namen der Werkzeuge, 3. die Namen der Handlung, der Eigenschaft und des Zustandes, 4. die Namen der vergegenständlichten Tat oder Eigenschaft, 5. die Namen der Lokalisierung und 6. Verschiedene. Nur bei den Wortbildungen aus einer substantivischen Basis gibt es noch eine besondere, die s. g. Modifikationsbedeutungsgruppe (Feminativa und Maskulinativa, Kollektiva, Gradativa, Iuvenalia, Diminutiva, Diminutivhipokoristika, Diminutivpeirotiva und Peiorativa. - Dabei wird keine Riick sicht darauf genommen, ob diese Suffixe genain slowenisch oder aus anderen Sprachen übernommen sind. Die Berechtigung dafiir gibt uns nicht nur die produktive Wortbildung mit den entlehnten (nichtautochtonen Suffixen im gegenwärtigen Slowenisch, sondern (was noch wichtiger ist auch das richtige Verständnisvermögen der Sprecher für solche Wortbildungen im
A derivational rephrasing experiment for question answering
Jacquemin, Bernard
2010-01-01
In Knowledge Management, variations in information expressions have proven a real challenge. In particular, classical semantic relations (e.g. synonymy) do not connect words with different parts-of-speech. The method proposed tries to address this issue. It consists in building a derivational resource from a morphological derivation tool together with derivational guidelines from a dictionary in order to store only correct derivatives. This resource, combined with a syntactic parser, a semantic disambiguator and some derivational patterns, helps to reformulate an original sentence while keeping the initial meaning in a convincing manner This approach has been evaluated in three different ways: the precision of the derivatives produced from a lemma; its ability to provide well-formed reformulations from an original sentence, preserving the initial meaning; its impact on the results coping with a real issue, ie a question answering task . The evaluation of this approach through a question answering system shows...
Weather Derivatives – Origin, Types and Application
Directory of Open Access Journals (Sweden)
Piotr Binkowski
2008-03-01
Full Text Available The number of companies that are exposed to the revenues loss risk caused by weather variability is still increasing. The businesses that are mostly exposed to weather risk are following: energy, agriculture, constructions and transport. That situation has initiated dynamic growth of weather derivatives markets as well as the awareness of the weather risk among the market participants. Presently, the weather derivatives markets evaluate rapidly in all the mature economies: USA, Asia and Europe. Constructing weather derivatives relies on qu- antifying climate factors in the form of indexes, what is quite simple task, more difficultly can be gathering precise historical data of required climate factors. Taking into consideration so far development of derivatives ñ especially the financial derivatives based on different types of indexes ñ financial market has at disposal wide range of different types of proved derivatives (futures, forward, options, swaps, which can be successfully utilised on the weather-driven markets both for hedging weather risk and speculating.
Speeding up Derivative Configuration from Product Platforms
Directory of Open Access Journals (Sweden)
Ruben Heradio
2014-06-01
Full Text Available To compete in the global marketplace, manufacturers try to differentiate their products by focusing on individual customer needs. Fulfilling this goal requires that companies shift from mass production to mass customization. Under this approach, a generic architecture, named product platform, is designed to support the derivation of customized products through a configuration process that determines which components the product comprises. When a customer configures a derivative, typically not every combination of available components is valid. To guarantee that all dependencies and incompatibilities among the derivative constituent components are satisfied, automated configurators are used. Flexible product platforms provide a big number of interrelated components, and so, the configuration of all, but trivial, derivatives involves considerable effort to select which components the derivative should include. Our approach alleviates that effort by speeding up the derivative configuration using a heuristic based on the information theory concept of entropy.
Generalized derivations of Lie triple systems
Directory of Open Access Journals (Sweden)
Zhou Jia
2016-01-01
Full Text Available In this paper, we present some basic properties concerning the derivation algebra Der (T, the quasiderivation algebra QDer (T and the generalized derivation algebra GDer (T of a Lie triple system T, with the relationship Der (T ⊆ QDer (T ⊆ GDer (T ⊆ End (T. Furthermore, we completely determine those Lie triple systems T with condition QDer (T = End (T. We also show that the quasiderivations of T can be embedded as derivations in a larger Lie triple system.
Biological activities of substituted trichostatic acid derivatives
Indian Academy of Sciences (India)
Cédric Charrier; Joëlle Roche; Jean-Pierre Gesson; Philippe Bertrand
2009-07-01
New substituted trichostatic acid derivatives have been synthesized and evaluated for their biological activities towards the H661 non-small lung cancer cell line. These syntheses were achieved by alkylation of propiophenones to introduce the side chain with a terminal precursor of hydroxamic acid and aminobenzamide derivatives. The first fluorinated derivatives of trichostatic acid are described, such as 6-fluoro trichostatin A, with antiproliferative activities in the micromolar range and with histone deacetylase inhibitory activity.
Ophthalmic use of blood-derived products.
Nugent, Ryan B; Lee, Graham A
2015-01-01
There is a wide spectrum of blood-derived products that have been used in many different medical and surgical specialties with success. Blood-derived products for clinical use can be extracted from autologous or allogeneic specimens of blood, but recombinant products are also commonly used. A number of blood derivatives have been used for a wide range of ocular conditions, from the ocular surface to the retina. With stringent preparation guidelines, the potential risk of transmission of blood-borne diseases is minimized. We review blood-derived products and how they are improving the management of ocular disease.
Generalized gravitational entropy from total derivative action
Dong, Xi; Miao, Rong-Xin
2015-12-01
We investigate the generalized gravitational entropy from total derivative terms in the gravitational action. Following the method of Lewkowycz and Maldacena, we find that the generalized gravitational entropy from total derivatives vanishes. We compare our results with the work of Astaneh, Patrushev, and Solodukhin. We find that if total derivatives produced nonzero entropy, the holographic and the field-theoretic universal terms of entanglement entropy would not match. Furthermore, the second law of thermodynamics could be violated if the entropy of total derivatives did not vanish.
Generalized Gravitational Entropy from Total Derivative Action
Dong, Xi
2015-01-01
We investigate the generalized gravitational entropy from total derivative terms in the gravitational action. Following the method of Lewkowycz and Maldacena, we find that the generalized gravitational entropy from total derivatives vanishes. We compare our results with the work of Astaneh, Patrushev, and Solodukhin. We find that if total derivatives produced nonzero entropy, the holographic and the field-theoretic universal terms of entanglement entropy would not match. Furthermore, the second law of thermodynamics could be violated if the entropy of total derivatives did not vanish.
Higher derivations on rings and modules
Directory of Open Access Journals (Sweden)
Paul E. Bland
2005-01-01
Full Text Available Let τ be a hereditary torsion theory on ModR and suppose that Qτ:ModR→ModR is the localization functor. It is shown that for all R-modules M, every higher derivation defined on M can be extended uniquely to a higher derivation defined on Qτ(M if and only if τ is a higher differential torsion theory. It is also shown that if τ is a TTF theory and Cτ:M→M is the colocalization functor, then a higher derivation defined on M can be lifted uniquely to a higher derivation defined on Cτ(M.
Synthesis of Polynuclear Heterocyclic Compounds Derived from Thieno[2,3-d]pyrimidine Derivatives
Directory of Open Access Journals (Sweden)
N. A. Hassan
2000-06-01
Full Text Available Reaction of 2-hydrazino-3-methyl-3,4-dihydrothieno[2,3-d]pyrimidin-4-one derivatives 2a,b with aliphatic acids afforded the thienotriazolopyrimidinone derivatives 3a-d, with nitrous acid yielded tetrazolothienopyrimidinone derivatives 4a,b and with carbon disulphide furnished 3-mercaptothienotriazolopyrimidinone derivatives 5a,b. Also, 2a,b reacted with aldehydes to afford the arylhydrazones 6a-f which cyclized into thienotriazolopyrimidinone derivatives 7a-f. Furthermore, 2a,b condensed with ethyl acetoacetate and ethyl cyanoacetate to afford 2-(1-pyrazolyl derivatives 9a,b and 10a,b, respectively. On the other hand, 2-hydrazino derivatives 2a,b condensed with a-halo-ketones to yield thienpyrimidotriazinone derivatives 11a,b and with ÃŽÂ²-diketones, to form 2-(1-pyrazolyl derivatives 12a-f.
Boermans, PAMM; Go, HS; Wessels, AMA; Uges, DRA
2006-01-01
An unexpectedly high number of initially suspected cocaine-intoxicated patients was presented to a general hospital in Lelystad, The Netherlands. Based on the unusual toxidram rate of not fitting cocaine intoxication, the suspicion of co-presence of an anticholinergic agent was raised. A newly devel
Properties of derivations on some convolution algebras
DEFF Research Database (Denmark)
Pedersen, Thomas Vils
2014-01-01
For all convolution algebras L1[0; 1); L1 loc and A(!) = T n L1(!n), the derivations are of the form Dμf = Xf μ for suitable measures μ, where (Xf)(t) = tf(t). We describe the (weakly) compact as well as the (weakly) Montel derivations on these algebras in terms of properties of the measure μ...
Stabilization of biomass-derived pyrolysis oils
Venderbosch, R. H.; Ardiyanti, A. R.; Wildschut, J.; Oasmaa, A.; Heeres, H. J.
2010-01-01
BACKGROUND: Biomass is the only renewable feedstock containing carbon, and therefore the only alternative to fossil-derived crude oil derivatives. However, the main problems concerning the application of biomass for biofuels and bio-based chemicals are related to transport and handling, the limited
An All-Orders Derivative Expansion
Dunne, Gerald(Department of Physics, University of Connecticut, Storrs, CT, 06269, U.S.A.)
1996-01-01
We evaluate the exact $QED_{2+1}$ effective action for fermions in the presence of a family of static but spatially inhomogeneous magnetic field profiles. This exact result yields an all-orders derivative expansion of the effective action, and indicates that the derivative expansion is an asymptotic, rather than a convergent, expansion.
Structure-activity relationships of bumetanide derivatives
DEFF Research Database (Denmark)
Pedersen, Kasper Lykke; Töllner, Kathrin; Römermann, Kerstin;
2015-01-01
of diuretics such as bumetanide. Bumetanide was discovered by screening ∼5000 3-amino-5-sulfamoylbenzoic acid derivatives, long before NKCC2 was identified in the kidney. Therefore, structure-activity studies on effects of bumetanide derivatives on NKCC2 are not available. EXPERIMENTAL APPROACH: In this study...
Covariant derivative expansion of the heat kernel
Energy Technology Data Exchange (ETDEWEB)
Salcedo, L.L. [Universidad de Granada, Departamento de Fisica Moderna, Granada (Spain)
2004-11-01
Using the technique of labeled operators, compact explicit expressions are given for all traced heat kernel coefficients containing zero, two, four and six covariant derivatives, and for diagonal coefficients with zero, two and four derivatives. The results apply to boundaryless flat space-times and arbitrary non-Abelian scalar and gauge background fields. (orig.)
Stereoselective synthesis of partially protected azasugar derivatives
Institute of Scientific and Technical Information of China (English)
LI Xiaoliu; DUAN Kefang; TIAN Jun; XU Xiaoming
2007-01-01
Five-membered azasugar derivatives with partially protected hydroxyl groups,and their fluorinated derivatives were synthesized via the key intermediates of norbornyl-like bicyclic acetals using o-xylose and o-glucose as starting materials.The glycosylation of the azasugar intermediate and 1-methylenesugar was also explored.
Green's Theorem for Generalized Fractional Derivatives
Odzijewicz, Tatiana; Torres, Delfim F M
2012-01-01
We study three types of generalized partial fractional operators. An extension of Green's theorem, by considering partial fractional derivatives with more general kernels, is proved. New results are obtained, even in the particular case when the generalized operators are reduced to the standard partial fractional derivatives and fractional integrals in the sense of Riemann-Liouville or Caputo.
17 CFR 200.506 - Derivative classification.
2010-04-01
... 17 Commodity and Securities Exchanges 2 2010-04-01 2010-04-01 false Derivative classification. 200...; CONDUCT AND ETHICS; AND INFORMATION AND REQUESTS Classification and Declassification of National Security Information and Material § 200.506 Derivative classification. Any document that includes...
5 CFR 2500.5 - Derivative classification.
2010-01-01
... 5 Administrative Personnel 3 2010-01-01 2010-01-01 false Derivative classification. 2500.5 Section 2500.5 Administrative Personnel OFFICE OF ADMINISTRATION, EXECUTIVE OFFICE OF THE PRESIDENT INFORMATION SECURITY REGULATION § 2500.5 Derivative classification. The Office of Administration serves only as...
45 CFR 601.5 - Derivative classification.
2010-10-01
... 45 Public Welfare 3 2010-10-01 2010-10-01 false Derivative classification. 601.5 Section 601.5... CLASSIFICATION AND DECLASSIFICATION OF NATIONAL SECURITY INFORMATION § 601.5 Derivative classification. Distinct from “original” classification is the determination that information is in substance the same...
12 CFR 403.4 - Derivative classification.
2010-01-01
... 12 Banks and Banking 4 2010-01-01 2010-01-01 false Derivative classification. 403.4 Section 403.4 Banks and Banking EXPORT-IMPORT BANK OF THE UNITED STATES CLASSIFICATION, DECLASSIFICATION, AND SAFEGUARDING OF NATIONAL SECURITY INFORMATION § 403.4 Derivative classification. (a) Use of...
28 CFR 17.26 - Derivative classification.
2010-07-01
..., the ISOO implementing directives in 32 CFR 2001.22, and internal Department directions provided by the... 28 Judicial Administration 1 2010-07-01 2010-07-01 false Derivative classification. 17.26 Section... ACCESS TO CLASSIFIED INFORMATION Classified Information § 17.26 Derivative classification. (a)...
22 CFR 9.6 - Derivative classification.
2010-04-01
... CFR 2001.22. (c) Department of State Classification Guide. The Department of State Classification... 22 Foreign Relations 1 2010-04-01 2010-04-01 false Derivative classification. 9.6 Section 9.6... classification. (a) Definition. Derivative classification is the incorporating, paraphrasing, restating...
Generalized Derivative Based Kernelized Learning Vector Quantization
Schleif, Frank-Michael; Villmann, Thomas; Hammer, Barbara; Schneider, Petra; Biehl, Michael; Fyfe, Colin; Tino, Peter; Charles, Darryl; Garcia-Osoro, Cesar; Yin, Hujun
2010-01-01
We derive a novel derivative based version of kernelized Generalized Learning Vector Quantization (KGLVQ) as an effective, easy to interpret, prototype based and kernelized classifier. It is called D-KGLVQ and we provide generalization error bounds, experimental results on real world data, showing t
Microbial Degradation of Indole and Its Derivatives
Directory of Open Access Journals (Sweden)
Pankaj Kumar Arora
2015-01-01
Full Text Available Indole and its derivatives, including 3-methylindole and 4-chloroindole, are environmental pollutants that are present worldwide. Microbial degradation of indole and its derivatives can occur in several aerobic and anaerobic pathways; these pathways involve different known and characterized genes. In this minireview, we summarize and explain the microbial degradation of indole, indole-3-acetic acid, 4-chloroindole, and methylindole.
The Option Value in Timing Derivative Trades
Drost, Feico; van der Heijden, T.G.E.; Werker, Bas
2015-01-01
Risk-neutral traders executing derivative trades on behalf of portfolio managers maximize their expected profit compared to trading at pre-determined times by timing trades, using the quickly changing risk exposures of derivative baskets. The optimal order submission strategy is a sequence of stop o
Understanding the Derivative through the Calculus Triangle
Weber, Eric; Tallman, Michael; Byerley, Cameron; Thompson, Patrick W.
2012-01-01
Typical treatments of the derivative do not clearly convey the idea that the derivative function represents the original function's rate of change. Revealing the relationship between a function and its rate-of-change function for static values of "x" does not facilitate productive ways of thinking about generating the rate-of-change function or…
Biology-Derived Algorithms in Engineering Optimization
Yang, Xin-She
2010-01-01
Biology-derived algorithms are an important part of computational sciences, which are essential to many scientific disciplines and engineering applications. Many computational methods are derived from or based on the analogy to natural evolution and biological activities, and these biologically inspired computations include genetic algorithms, neural networks, cellular automata, and other algorithms.
Simplicial approach to derived differential manifolds
Borisov, Dennis
2011-01-01
Derived differential manifolds are constructed using the usual homotopy theory of simplicial rings of smooth functions. They are proved to be equivalent to derived differential manifolds of finite type, constructed using homotopy sheaves of homotopy rings (D.Spivak), thus preserving the classical cobordism ring. This reduction to the usual algebraic homotopy can potentially lead to virtual fundamental classes beyond obstruction theory.
Adsorption and desorption of cellulose derivatives.
Hoogendam, C.W.
1998-01-01
Cellulose derivatives, in particular carboxymethyl cellulose (CMC) are used in many (industrial) applications. The aim of this work is to obtain insight into the adsorption mechanism of cellulose derivatives on solid-liquid interfaces.In chapter 1 of this thesis we discuss some appl
Generalized Fractional Derivative Anisotropic Viscoelastic Characterization
Directory of Open Access Journals (Sweden)
Harry H. Hilton
2012-01-01
Full Text Available Isotropic linear and nonlinear fractional derivative constitutive relations are formulated and examined in terms of many parameter generalized Kelvin models and are analytically extended to cover general anisotropic homogeneous or non-homogeneous as well as functionally graded viscoelastic material behavior. Equivalent integral constitutive relations, which are computationally more powerful, are derived from fractional differential ones and the associated anisotropic temperature-moisture-degree-of-cure shift functions and reduced times are established. Approximate Fourier transform inversions for fractional derivative relations are formulated and their accuracy is evaluated. The efficacy of integer and fractional derivative constitutive relations is compared and the preferential use of either characterization in analyzing isotropic and anisotropic real materials must be examined on a case-by-case basis. Approximate protocols for curve fitting analytical fractional derivative results to experimental data are formulated and evaluated.
Additive Lie ($\\xi$-Lie) Derivations and Generalized Lie ($\\xi$-Lie) Derivations on Prime Algebras
Qi, Xiaofei
2010-01-01
The additive (generalized) $\\xi$-Lie derivations on prime algebras are characterized. It is shown, under some suitable assumption, that an additive map $L$ is an additive (generalized) Lie derivation if and only if it is the sum of an additive (generalized) derivation and an additive map from the algebra into its center vanishing all commutators; is an additive (generalized) $\\xi$-Lie derivation with $\\xi\
Catalytic Synthesis Methods for Triazolopyrimidine Derivatives
Institute of Scientific and Technical Information of China (English)
2008-01-01
A new method for catalyzed synthesis of triazolopyrimidine derivatives is reported. Aikylamine reaction with dialkyl cyanodithioiminocarbonate was catalyzed by quaternary ammonium salts at room temperature to yield 3-alkylamine-5-amino-1,2,4-triazole in good quality and high yields. After imidization and reaction with an α,β-unsaturated acid derivative, the reaction intermediate was hydrolyzed in the presence of a Lewis acid to obtain the target product. This novel catalytic method for triazolopyrimidine derivatives can be carried out under inexpen-sive and mild conditions, and is safe and environmentally friendly. IH NMR results for all intermediates are re-ported.
Mechanism of Platinum Derivatives Induced Kidney Injury
Directory of Open Access Journals (Sweden)
Feifei YAN
2015-09-01
Full Text Available Platinum derivatives are the most widely used chemotherapeutic agents to treat solid tumors including ovarian, head and neck, and testicular germ cell tumors, lung cancer, and colorectal cancer. Two major problems exist, however, in the clinic use of platinum derivatives. One is the development of tumor resistance to the drug during therapy, leading to treatment failure. The other is the drug’s toxicity such as the cisplatin’s nephrotoxicity, which limits the dose that can be administered. This paper describes the mechanism of platinum derivatives induced kidney injury.
Monocyte-Derived Suppressor Cells in Transplantation.
Ochando, Jordi; Conde, Patricia; Bronte, Vincenzo
Myeloid-derived suppressor cells (MDSC) are cells of myeloid origin with enhanced suppressive function. They are negative regulators of the immune responses and comprise a heterogeneous mixture of immunosuppressive cells of monocytic (M-MDSC) and granulocytic (G-MDSC) origin. A more recent nomenclature proposes the term "suppressive monocyte derived cells" (suppressive MCs) to define CSF1/CSF2-dependent mouse suppressor cells that develop from common monocyte progenitors (cMoPs) after birth. Here, we review the literature about monocytic-derived cells with demonstrated suppressor function in vitro and in vivo within the context of solid organ transplantation.
SYNTHESIS AND CHARACTERIZATION OF TITANOCENE POLYMER DERIVATIVES
Institute of Scientific and Technical Information of China (English)
WANG Zhuting; SUN Shumen
1988-01-01
Titanocene polymer derivatives with potential antitumor properties were synthesized by interfacial condensation. The preformed polymers used are PAA (polyacrylic acid), CPSMA (1:1 alternating copolymer of styrene and maleic anhydride) and DVEMA (1:2 copolymer of divinyl ether and maleic anhydride). The ratio of practical and theoretical titanium content is 73.6%, 92.2% and 86.2% for PAA, CPSMA and DVEMA polymer derivatives respectively. The IR spectra of the polymer derivatives possess the characteristic absorptions of titanocene. XPS (X-ray photoelectron spectroscopy) of O1s and Ti2p3/2 supports the existence of Ti-O bonding.
Test Derivation Through Critical Path Transitions
Institute of Scientific and Technical Information of China (English)
李卫东; 魏道政
1992-01-01
In this paper, a new technique called test derivation is presented,aiming at the promotion of the random testing efficiency for combinational circuits,Combined with a fault simulator based on critical path tracing method,we introduce the concept of seed test derivation and attempt to generate a group of new tests from the seed test by means of critical path transition.The neccessary conditions and efficient algorithms are proposed to guarantee the usefulness of the newly derived tests and the correctness of the critical path transitions.Also,examples are given to demonstrate the effectiveness of the technique.
Derivation of GFDM Based on OFDM Principles
Energy Technology Data Exchange (ETDEWEB)
Hussein Moradi; Behrouz Farhang-Boroujeny
2015-06-01
This paper starts with discussing the principle based on which the celebrated orthogonal frequency division multiplexing (OFDM) signals are constructed. It then extends the same principle to construct the newly introduced generalized frequency division multiplexing (GFDM) signals. This novel derivation sheds light on some interesting properties of GFDM. In particular, our derivation seamlessly leads to an implementation of GFDM transmitter which has significantly lower complexity than what has been reported so far. Our derivation also facilitates a trivial understanding of how GFDM (similar to OFDM) can be applied in MIMO channels.
SYNTHESES AND PROPERTIES OF POLYMERIZABLE METALLOPHTHALOCYANINE DERIVATIVES
Institute of Scientific and Technical Information of China (English)
LIU Yunqi; YAMADA Akira; SHIGEHARA Kiyotaka; HARA Masahiko
1988-01-01
Metallophthalocyanine derivatives with polymerizable vinyl groups were synthesized, characterized and polymerized. Preliminary results on their Langmuir-Blodgett (LB) film formation and the electronic properties of (Indium-Tin Oxide/LB-film/Al) Schottky devices were reported.
Prediction on amphiphilicity of hypocrellin derivatives
Institute of Scientific and Technical Information of China (English)
谢杰; 马江华; 赵井泉
2002-01-01
Hypocrellins are most suitable for photodynamic therapy (PDT) of the diseases occurring in the superficial layer, such as microvascular diseases, because of their special absorption spectral properties. However, hypocrellins and most of their derivatives are basically lipophilic, while the hydrophilic derivatives lose the PDT activity in vivo. Therefore, the key problem for practical application of PDT of microvascular diseases focuses on finding the derivatives which possess optimized amphiphilicity. Herein, we developed a theoretical method to estimate the amphiphilicity of a molecule by the calculated average polarity. Compared with the experimentally measured results, the method is proved to be applicable. Based on the computation and available experimental results, it can be concluded that the derivative must have the polarities around 0.22 for optimized amphiphilicity.
Prediction on amphiphilicity of hypocrellin derivatives
Institute of Scientific and Technical Information of China (English)
谢杰; 马江华; 赵井泉
2002-01-01
Hypocrellins are most suitable for photodynamic therapy (PDT) of the diseases occurring in the superficial layer, such as microvascular diseases, because of their special absorption spectral properties. However, hypocrellins and most of their derivatives are basically lipophilic, while the hydrophilic derivatives lose the PDT activity in vivo. Therefore, the key problem for practical application of PDT of microvascular diseases focuses on finding the derivatives which possess optimized amphiphilicity. Herein, we developed a theoretical method to estimate the amphi-philicity of a molecule by the calculated average polarity. Compared with the experimentally measured results, the method is proved to be applicable. Based on the computation and available experimental results, it can be concluded that the derivative must have the polarities around C.22 for optimized amphiphilicity.
Polyimides Derived from Novel Asymmetric Benzophenone Dianhydrides
Chuang, Chun-Hua (Inventor)
2015-01-01
This invention relates to the composition and processes for preparing thermoset polyimides derived from an asymmetric dianhydride, namely 2,3,3',4'-benzophenone dianhydride (a-BTDA) with at least one diamine, and a monofunctional terminal endcaps. The monofunctional terminating groups include 4-phenylethynylphthalic anhydride ester-acid derivatives, phenylethyl trimellitic anhydride (PETA) and its ester derivatives as well as 3-phenylethynylaniline. The process of polyimide composite comprises impregnating monomer reactants of dianhydride or its ester-acid derivatives, diamine and with monofunctional reactive endcaps into glass, carbon, quartz or synthetic fibers and fabrics, and then stack up into laminates and subsequently heated to between 150-375.degree. C. either at atmosphere or under pressure to promote the curing and crosslinking of the reactive endcaps to form a network of thermoset polyimides.
SYNTHESIS AND BIOLOGICAL SCREENING OF BENZIMIDAZOLE DERIVATIVES
Directory of Open Access Journals (Sweden)
Ankur Shukla
2012-03-01
Full Text Available The synthesis of benzimidazoles derivative involves subsequent synthesis of 4-(2-chloro-ethoxy-benzaldehyde, 4 methyl benzaldehyde followed by benzimidazoles derivative by reaction between amines derivatives and o-phenylenediamine in dimethyl farmamide (DMF as solvent in the presence of iodine as a catalyst. Iodine is a commercial and environmentally benign catalyst. The yield of all benzimidazole derivatives was found to be in the range of 75 – 94%. The purity of the compounds was ascertained by melting point and TLC. The synthesized compounds were characterized by using IR,1H NMR, and MASS spectral data together with elemental analysis. The synthesized benzimidazole compounds were screened for analgesic and anticonvulsant activity in albino rat (100-200gm by using Writhing test and maximal electroshock (MES. Out of all compound studied only PS-3, PS-4, PS-5 and PS-6 showed significant analgesic activities and response against MES test.
Patient-Derived Antibody Targets Tumor Cells
An NCI Cancer Currents blog on an antibody derived from patients that killed tumor cells in cell lines of several cancer types and slowed tumor growth in mouse models of brain and lung cancer without evidence of side effects.
PHARMACOLOGICAL SCREENING OF SOME NEW AMINOPYRIDINIUM DERIVATIVES
Directory of Open Access Journals (Sweden)
Subramaniyan Navaneethakrishnan
2012-05-01
Full Text Available Aminopyridinium derivative such as Ethyl-2-(4-chloroamino pyridinium acetate (compound A,Ethyl-2-(4-bromoamino pyridinium acetate (compound B, Ethyl-2-(3-chloroaminopyridinium acetate (compound C have been evaluated for analgesic, anti anxiety and locomotor activity. All the aminopyridinium derivative prepared by the dose (50&100mg/kg/i.p, which shown significant analgesic activity when compared to morphine (5mg/kg/i.p.In case of open field exploratory and elevated plus maze test, the aminopyridinium derivatives prepared by the dose( 50&100mg/Kg/oral reverse the anxiety behavior of the mice when compared to lorazepam (0.5mg/kg/oral. Among this, compound C (100/mg/kg produce better effect than others. Locomotor activity in the activity cage, the reaction time of Aminopyridinium derivative A, B&C produce more effective Central nerve depressant effect than Diazepam (2mg/kg/i.p drug.
Regional Ecological Corridors - MLCCS derived 2008
Minnesota Department of Natural Resources — Identification of potential ecological corridors between the MLCCS derived ecological patches (ear_eco08py3). This was generated using cost / distance analysis,...
A New Synthetic Approach to Coumestan Derivatives
Institute of Scientific and Technical Information of China (English)
GONG, Deng-Huang; LI, Chao-Zhong; YUAN, Cheng-Ye
2001-01-01
A new method for the preparation of coumestan derivatives was described involving an intramolecular palladium-catalyzed ring closure reaction of coumarins obtained from condensation of substituted o-hydroxyphenylacetic acid and o-hydroxybenzaldehyde.
Higher Derivative Corrections To Extended Supersymmetric Theories
Braun, G A
2004-01-01
We investigate higher-derivative terms in N = 2 supersymmetric effective actions. We systematically construct such terms in harmonic superspace despite the infinite redundancy in their description due to the infinite number of auxiliary fields. We write all 3- and 4-derivative terms on Higgs, Coulomb, and mixed branches, modulo the existence of superspace Chern-Simons-like terms. Among these terms are several with only holomorphic dependence on fields, and at least one satisfies a non-renormalization theorem. We then search for superspace Chern-Simons-like terms, which are those gauge-invariant terms which cannot be written solely in terms of field strength superfields and covariant derivatives, but in which gauge potential superfield appears explicitly. We find a class of four- derivative terms with N = 2 supersymmetry which, though locally on the Coulomb branch can be written solely in terms of field strengths, globally on the Coulomb branch are superspace Chern- Simons-like.
Synthesis of Nucleoside Derivatives Containing Benzophenoxazinone Moiety
Institute of Scientific and Technical Information of China (English)
Yu GAO; Wu Xin ZOU; Ling WU; Jin Shui LI; Ji Tao WANG; Ji Ben MENG
2004-01-01
Two new nucleoside derivatives containing benzophenoxazinone moiety were synthesized. Their luminescence spectra show that they have strong near infrared fluorescence. Our study provides a new method for direct introduction of near infrared fluorescent probe to bioactive molecules.
Truncation Analysis for the Derivative Schrodinger Equation
Institute of Scientific and Technical Information of China (English)
XU Peng Cheng; CHANG Qian Shun; GUO Bo Ling
2002-01-01
The truncation equation for the derivative nonlinear Schrodinger equation has been dis-cussed in this paper. The existence of a special heteroclinic orbit has been found by using geometricalsingular perturbation theory together with Melnikov's technique.
Two New Butenolide Derivatives from Erigeron acer
Institute of Scientific and Technical Information of China (English)
无
2006-01-01
Two new butenolide derivatives, named as erigeracerin A and erigeracerin B, which are a pair of epimers, were isolated from Erigeron acer. Their structures were elucidated by spectroscopic analysis including 2D NMR and HR-ESI-MS.
MANGROVE-DERIVED NUTRIENTS AND CORAL REEFS
Understanding the consequences of the declining global cover of mangroves due to anthropogenic disturbance necessitates consideration of how mangrove-derived nutrients contribute to threatened coral reef systems. We sampled potential sources of organic matter and a suite of sessi...
DERIVATIONS AND EXTENSIONS OF LIE COLOR ALGEBRA
Institute of Scientific and Technical Information of China (English)
Zhang Qingcheng; Zhang Yongzheng
2008-01-01
In this article, the authors obtain some results concerning derivations of fi-nitely generated Lie color algebras and discuss the relation between skew derivation space SkDer(L) and central extension H2(L, F) on some Lie color algebras. Meanwhile, they generalize the notion of double extension to quadratic Lie color algebras, a sufficient con-dition for a quadratic Lie color algebra to be a double extension and further properties are given.
Synthesis of furan from allenic sulfide derivatives
Institute of Scientific and Technical Information of China (English)
无
2009-01-01
In this paper, we report the synthesis of furan derivatives from allenic sulfides. By the reaction with NaH, β-Hydroxyl allenic sulfides were found to generate furan products in excellent yields with the removal of phenylthio group. β-Aldehyde allenic sulfides were found to give similar furan products with one more substituent when treated with additional nucleophilic reagents. β-ketone allenic sulfides can also cyclize to give furan derivatives with the promotion of P2O5.
The period functions' higher order derivatives
Sabatini, Marco
2012-01-01
We prove a formula for the $n$-th derivative of the period function $T$ in a period annulus of a planar differential system. For $n = 1$, we obtain Freire, Gasull and Guillamon formula for the period's first derivative \\cite{FGG}. We apply such a result to hamiltonian systems with separable variables and other systems. We give some sufficient conditions for the period function of conservative second order O.D.E.'s to be convex.
Synthesis of furan from allenic sulfide derivatives
Institute of Scientific and Technical Information of China (English)
PENG LingLing; ZHANG Xiu; MA Jie; ZHONG ZhenZhen; ZHANG Zhe; ZHANG Yan; WANG JianBo
2009-01-01
In this paper, we report the synthesis of furan derivatives from allenic sulfides. By the reaction with NaH.,β-Hydroxyl allenic sulfides were found to generate furan products in excellent yields with the removal of phenylthio group.β-Aldehyde allenic sulfides were found to give similar furan products with one more substituent when treated with additional nucleophilic reagents. β-ketone allenic sulfides can also cyclize to give furan derivatives with the promotion of P2O5.
Synthesis of Pharmacological Heterocyclic Derivatives Based Surfactants.
El-Sayed, Refat; Fadda, Ahmed A
2016-01-01
Synthesis of chromenopyrimidine derivatives and the related fused system carried out by the reaction of chromene derivative 1 with various reagents under suitable reaction conditions. Condensation of stearoyl chloride with these heterocycles, then, propoxylated the products using propylene oxide to produce surface active agents having a twofold capacity as surface and antimicrobial dynamic specialists which may be served in the production of medications, pesticides, beautifying agents or may be utilized as an antimicrobial. Some of the surface properties and antimicrobial activity were resolved.
Three essays on credit derivatives and liquidity
Arakelyan, Armen
2012-01-01
This thesis consists of three empirical essays on pricing credit derivatives and the impact of liquidity on the prices of credit derivatives. In essay one, I investigate empirically the pricing of Collateralized Debt Obligations (CDO) within the framework of copula models. In essay two I analyze the impact of illiquidity on Credit Default Swap (CDS) spreads on an individual level. In essay three I analyze the effect of market wide illiquidity on portfolio CDS spreads on an aggrega...
Higher time derivatives, stability and Fermi Statistics
Lopez-Sarrion, Justo
2011-01-01
We show that statistics is crucial for the instability problem derived from higher time derivatives. In fact, and contrary to previous statements, we check that when dealing with Fermi systems, the Hamiltonian is well bounded and the quantum states are normalizable. Although, ghost states are still present, they do not affect unitarity under certain conditions. We first analyze a quantum oscillator involving Grassman variables and then we generalize it to a Dirac field. Finally, we discuss some physical implications
Photochemistry of hypocrellin derivatives under aerobic conditions
Institute of Scientific and Technical Information of China (English)
无
2000-01-01
Hypocrellins are a novel type of photosensitizers. A series of new hypocrellin B (HB) derivatives have been synthesized to overcome their limitations, I.e. To improve their red absorption and amphiphilicity. The generation of reactive oxygen species (including superoxide anion radical, hydroxyl radical and singlet oxygen) is investigated in the presence of oxygen. The chemical structures of HB derivatives affect not only the generation efficiencies of superoxide and hydroxyl radicals, but also quantum yields of singlet oxygen.
Terpenes from Marine-Derived Fungi
Rainer Ebel
2010-01-01
Terpenes from marine-derived fungi show a pronounced degree of structural diversity, and due to their interesting biological and pharmacological properties many of them have aroused interest from synthetic chemists and the pharmaceutical industry alike. The aim of this paper is to give an overview of the structural diversity of terpenes from marine-derived fungi, highlighting individual examples of chemical structures and placing them in a context of other terpenes of fungal origin. Wherever ...
Fluorescence of fullerene derivatives at room temperature
Energy Technology Data Exchange (ETDEWEB)
Lin, S.K.; Shiu, L.L.; Chien, K.M.; Luh, T.Y.; Lin, T.I. (National Taiwan Univ., Taipei (Taiwan, Province of China))
1995-01-05
The absorption and fluorescence spectral properties of fullerene (C[sub 60]) and its derivatives C[sub 60]C[sub 4]H[sub 6], C[sub 60]C[sub 5]H[sub 6], C[sub 60]CHCO[sub 2]Et, and C[sub 60]NCO[sub 2]Et at room temperature were investigated. Breaking the structural symmetry of C[sub 60] results in enhancing the fluorescence quantum yield 2-3-fold in some derivatives. Thus, the room temperature fluorescence of fullerene compounds could be detected more rapidly. New absorption bands and altered fluorescence spectra were observed in the derivatives. The Stokes' shifts of the derivatives are small, about 4-5 nm, compared to 68 nm for the parent compound. The time-resolved fluorescence decay study indicates that all four fullerene derivatives have a single fluorescence lifetime of ca. 1.2-1.4 as, which is about the same as that for C[sub 60] (ca. 1.3 ns). Aliphatic solvents have little influence on the absorption or fluorescence spectral profile except on the extinction coefficient whereas aromatic and polar solvents strongly interact with the fullerene derivatives, causing a peak broadening effect. 31 refs., 7 figs., 3 tabs.
Quadratic forms and Clifford algebras on derived stacks
Vezzosi, Gabriele
2013-01-01
In this paper we present an approach to quadratic structures in derived algebraic geometry. We define derived n-shifted quadratic complexes, over derived affine stacks and over general derived stacks, and give several examples of those. We define the associated notion of derived Clifford algebra, in all these contexts, and compare it with its classical version, when they both apply. Finally, we prove three main existence results for derived shifted quadratic forms over derived stacks, define ...
Crystallisation and crystal forms of carbohydrate derivatives
Lennon, Lorna
This thesis is focused on the synthesis and solid state analysis of carbohydrate derivatives, including many novel compounds. Although the synthetic chemistry surrounding carbohydrates is well established in the literature, the crystal chemistry of carbohydrates is less well studied. Therefore this research aims to improve understanding of the solid state properties of carbohydrate derivatives through gaining more information on their supramolecular bonding. Chapter One focuses on an introduction to the solid state of organic compounds, with a background to crystallisation, including issues that can arise during crystal growth. Chapter Two is based on glucopyranuronate derivatives which are understudied in terms of their solid state forms. This chapter reports on the formation of novel glucuronamides and utilising the functionality of the amide bond for crystallisation. TEMPO oxidation was completed to form glucopyranuronates by oxidation of the primary alcohol groups of glucosides to the carboxylic acid derivatives, to increase functionality for enhanced crystal growth. Chapter Three reports on the synthesis of glucopyranoside derivatives by O-glycosylation reactions and displays crystal structures, including a number of previously unsolved acetate protected and deprotected crystal structures. More complex glycoside derivatives were also researched in an aim to study the resultant supramolecular motifs. Chapter Four contains the synthesis of aryl cellobioside derivatives including the novel crystal structures that were solved for the acetate protected and deprotected compounds. Research was carried out to determine if 1-deoxycellodextrins could act as putative isostructures for cellulose. Our research displays the presence of isostructural references with 1-deoxycellotriose shown to be similar to cellulose III11, 1-deoxycellotetraose correlates with cellulose IV11 and 1-deoxycellopentose shows isostructurality similar to that of cellulose II. Chapter Five contains
Additive Lie (ζ-Lie) Derivations and Generalized Lie (ζ-Lie)Derivations on Prime Algebras
Institute of Scientific and Technical Information of China (English)
Xiao Fei QI; Jin Chuan HOU
2013-01-01
The additive (generalized) ζ-Lie derivations on prime algebras are characterized.It is shown,under some suitable assumptions,that an additive map L is an additive generalized Lie derivation if and only if it is the sum of an additive generalized derivation and an additive map from the algebra into its center vanishing all commutators; is an additive (generalized) ζ-Lie derivation with ζ ≠ 1 if and only if it is an additive (generalized) derivation satisfying L(ζA) =ζL(A) for all A.These results are then used to characterize additive (generalized) ζ-Lie derivations on several operator algebras such as Banach space standard operator algebras and von Neumman algebras.
Derivation of completely cell culture-derived mice from early-passage embryonic stem cells.
Nagy, A.; Rossant, J.; Nagy, R.; Abramow-Newerly, W; Roder, J C
1993-01-01
Several newly generated mouse embryonic stem (ES) cell lines were tested for their ability to produce completely ES cell-derived mice at early passage numbers by ES cell tetraploid embryo aggregation. One line, designated R1, produced live offspring which were completely ES cell-derived as judged by isoenzyme analysis and coat color. These cell culture-derived animals were normal, viable, and fertile. However, prolonged in vitro culture negatively affected this initial totipotency of R1, and...
Structure Activity Relationship of Brevenal Hydrazide Derivatives
Directory of Open Access Journals (Sweden)
Allan Goodman
2014-03-01
Full Text Available Brevenal is a ladder frame polyether produced by the dinoflagellate Karenia brevis. This organism is also responsible for the production of the neurotoxic compounds known as brevetoxins. Ingestion or inhalation of the brevetoxins leads to adverse effects such as gastrointestinal maladies and bronchoconstriction. Brevenal shows antagonistic behavior to the brevetoxins and shows beneficial attributes when administered alone. For example, in an asthmatic sheep model, brevenal has been shown to increase tracheal mucosal velocity, an attribute which has led to its development as a potential treatment for Cystic Fibrosis. The mechanism of action of brevenal is poorly understood and the exact binding site has not been elucidated. In an attempt to further understand the mechanism of action of brevenal and potentially develop a second generation drug candidate, a series of brevenal derivatives were prepared through modification of the aldehyde moiety. These derivatives include aliphatic, aromatic and heteroaromatic hydrazide derivatives. The brevenal derivatives were tested using in vitro synaptosome binding assays to determine the ability of the compounds to displace brevetoxin and brevenal from their native receptors. A sheep inhalation model was used to determine if instillation of the brevenal derivatives resulted in bronchoconstriction. Only small modifications were tolerated, with larger moieties leading to loss of affinity for the brevenal receptor and bronchoconstriction in the sheep model.
Multiscale analysis of the CMB temperature derivatives
Marcos-Caballero, A.; Martínez-González, E.; Vielva, P.
2017-02-01
We study the Planck CMB temperature at different scales through its derivatives up to second order, which allows one to characterize the local shape and isotropy of the field. The problem of having an incomplete sky in the calculation and statistical characterization of the derivatives is addressed in the paper. The analysis confirms the existence of a low variance in the CMB at large scales, which is also noticeable in the derivatives. Moreover, deviations from the standard model in the gradient, curvature and the eccentricity tensor are studied in terms of extreme values on the data. As it is expected, the Cold Spot is detected as one of the most prominent peaks in terms of curvature, but additionally, when the information of the temperature and its Laplacian are combined, another feature with similar probability at the scale of 10o is also observed. However, the p-value of these two deviations increase above the 6% when they are referred to the variance calculated from the theoretical fiducial model, indicating that these deviations can be associated to the low variance anomaly. Finally, an estimator of the directional anisotropy for spinorial quantities is introduced, which is applied to the spinors derived from the field derivatives. An anisotropic direction whose probability is <1% is detected in the eccentricity tensor.
Deriving Framework Usages Based on Behavioral Models
Zenmyo, Teruyoshi; Kobayashi, Takashi; Saeki, Motoshi
One of the critical issue in framework-based software development is a huge introduction cost caused by technical gap between developers and users of frameworks. This paper proposes a technique for deriving framework usages to implement a given requirements specification. By using the derived usages, the users can use the frameworks without understanding the framework in detail. Requirements specifications which describe definite behavioral requirements cannot be related to frameworks in as-is since the frameworks do not have definite control structure so that the users can customize them to suit given requirements specifications. To cope with this issue, a new technique based on satisfiability problems (SAT) is employed to derive the control structures of the framework model. In the proposed technique, requirements specifications and frameworks are modeled based on Labeled Transition Systems (LTSs) with branch conditions represented by predicates. Truth assignments of the branch conditions in the framework models are not given initially for representing the customizable control structure. The derivation of truth assignments of the branch conditions is regarded as the SAT by assuming relations between termination states of the requirements specification model and ones of the framework model. This derivation technique is incorporated into a technique we have proposed previously for relating actions of requirements specifications to ones of frameworks. Furthermore, this paper discuss a case study of typical use cases in e-commerce systems.
Machian derivation of the Friedmann equation
Telkamp, Herman
2016-08-01
Despite all fundamental objections against Newtonian concepts in cosmology, the Friedmann equation derives from these in an astoundingly simple way through application of the shell theorem and conservation of Newtonian energy in an infinite universe. However, Friedmann universes in general possess a finite gravitational horizon, as a result of which the application of the shell theorem fails and the Newtonian derivation collapses. Hence, unlike the general relativistic derivation, the Newtonian derivation does not prove the Friedmann equation in general, but exclusively in the Newtonian case of an infinite horizon. We show that in the presence of a gravitational horizon the Friedmann equation can be derived from conservation of Machian energy, without invoking the shell theorem. Whereas in the Newtonian case total energy translates to curvature energy density, in the Machian case total energy takes on different identities, depending on the evolution of the horizon; we show that in the de Sitter universe Machian total energy density is constant, i.e. appears as cosmological constant.
Institute of Scientific and Technical Information of China (English)
BAKEER; HadeerMohammed
2003-01-01
The reaction of ethyl esters of 4-methyl-2-oxo-2H-l-benzo(naphtho) pyran.3-carboxylic acids (1) with aromatic aldehy-des in the presence of piperidine yielded 4-styryl-3-carboxami-dopiperidyl connmrin derivatives 4. The reaction of hydrazlne hydrate with 1 gave acetophenone hydrozone derivatives 5 and acetophenone azine derivatives 6. The reaction of 1 with prima-ry amines afforded compomlds 7—9. And the treatment of la with Grignard reagents afforded 3-aroyl-4-methyl coumarin derivatives 10.
Energy Technology Data Exchange (ETDEWEB)
Xu Yuhua, E-mail: yuhuaxu2004@163.co [College of Information Science and Technology, Donghua University, Shanghai 201620 (China) and Department of Maths, Yunyang Teachers' College, Hubei 442000 (China); Zhou Wuneng, E-mail: wnzhou@163.co [College of Information Science and Technology, Donghua University, Shanghai 201620 (China); Fang Jian' an [College of Information Science and Technology, Donghua University, Shanghai 201620 (China); Sun Wen [School of Mathematics and Information, Yangtze University, Hubei Jingzhou 434023 (China)
2010-04-05
This Letter investigates the synchronization of a general complex dynamical network with non-derivative and derivative coupling. Based on LaSalle's invariance principle, adaptive synchronization criteria are obtained. Analytical result shows that under the designed adaptive controllers, a general complex dynamical network with non-derivative and derivative coupling can asymptotically synchronize to a given trajectory, and several useful criteria for synchronization are given. What is more, the coupling matrix is not assumed to be symmetric or irreducible. Finally, simulations results show the method is effective.
Synthesis and antiproliferative activity of new tonantzitlolone-derived diterpene derivatives.
Busch, Torsten; Dräger, Gerald; Kunst, Eike; Benson, Hannah; Sasse, Florenz; Siems, Karsten; Kirschning, Andreas
2016-10-14
The synthesis of the diterpene (+)-tonantzitlolone A and a series of derivatives is reported. The study includes the determination of their antiproliferative activities against selected cancer cell lines.
A REMARK ON THE DERIVATE OF SET-VALUED MAPPING
Institute of Scientific and Technical Information of China (English)
CheaBing
1994-01-01
The derivate of set-valued mappings was defined by Hakuhara M in [1] and is called H-derivate. This paper shows a necessary and sufficient condition for a set-valued mapping to be derivable in term of Hderivate and the conditions in which lirnit and derivate ,derivate and integyal are exchanged respectively.
Symmetric Partial Derivatives%对称偏导数
Institute of Scientific and Technical Information of China (English)
徐永平
2001-01-01
In this paper, symmetric partial derivatives and symmetric total differential of a function of several variables are defined. The relationship between partial derivative and the symmetric partial derivative, the total differential and the symmetric total derivative are discussed. By means of the concept of symmetric partial derivatives, the existence theorem of the total differential of a function of several is obtained.
Another derivation of generalized Langevin equations
Dengler, R
2015-01-01
The formal derivation of Langevin equations (and, equivalently Fokker-Planck equations) with projection operator techniques of Mori, Zwanzig, Kawasaki and others can well be called a pearl of theoretical physics. The derivation relies on classical mechanics, and encompasses everything an omnipotent engineer can construct from point particles and potentials: solids, liquids, liquid crystals, conductors, polymers, systems with spin-like degrees of freedom ... Einstein relations and Onsager reciprocity theorem come for free. It apparently not has widely found its way into textbooks, but has been reproduced dozens of times on the fly with many references to the literature and without adding much substantially new. Here we follow the tradition, but strive to produce a self-contained text. Furthermore, we address questions that naturally arise in the derivation. Among other things the meaning of the divergence of the Poisson brackets is explained, and the role of nonlinear damping coefficients is clarified.
Optimal hedging of Derivatives with transaction costs
Aurell, E; Aurell, Erik; Muratore-Ginanneschi, Paolo
2005-01-01
We investigate the optimal strategy over a finite time horizon for a portfolio of stock and bond and a derivative in an multiplicative Markovian market model with transaction costs (friction). The optimization problem is solved by a Hamilton-Bellman-Jacobi equation, which by the verification theorem has well-behaved solutions if certain conditions on a potential are satisfied. In the case at hand, these conditions simply imply arbitrage-free ("Black-Scholes") pricing of the derivative. While pricing is hence not changed by friction allow a portfolio to fluctuate around a delta hedge. In the limit of weak friction, we determine the optimal control to essentially be of two parts: a strong control, which tries to bring the stock-and-derivative portfolio towards a Black-Scholes delta hedge; and a weak control, which moves the portfolio by adding or subtracting a Black-Scholes hedge. For simplicity we assume growth-optimal investment criteria and quadratic friction.
Derivatives on the isotropic tensor functions
Institute of Scientific and Technical Information of China (English)
DUI; Guansuo; WANG; Zhengdao; JIN; Ming
2006-01-01
The derivative of the isotropic tensor function plays an important part in continuum mechanics and computational mechanics, and also it is still an opening problem. By means of a scalar response function and solving a tensor equation, this problem is well studied. A compact explicit expression for the derivative of the isotropic tensor function is presented, which is valid for both distinct and repeated eigenvalue cases. Throughout the analysis, the formulation holds for general isotropic tensor functions without need to solve eigenvector problems or determine coefficients. On the theoretical side, a very simple solution of a tensor equation is obtained. As an application to continuum mechanics, a base-free expression for the Hill's strain rate is given, which is more compact than the existent results. Finally, with an example we compute the derivative of an exponent tensor function. And the efficiency of the present formulations is demonstrated.
Electrical derivative measurement of quantum cascade lasers
Guo, Dingkai; Cheng, Liwei; Chen, Xing; Choa, Fow-Sen; Fan, Jenyu; Worchesky, Terry
2011-02-01
The electrical derivative characteristics of quantum cascade lasers (QCLs) are investigated to test the QCL threshold, leakage current, and possibly explore carrier transport. QCL thresholds can be identified by searching for the slope peak of the first derivative of the I-V curves and can be further confirmed with its alignment to the peak of the second derivative of the I-V curves. Leakage current in QCLs with oxide-blocked ridge waveguides and buried heterostructure (BH) waveguides are studied and compared. The oxide-blocking structures provide the lowest leakage current although the capped-mesa-BH (CMBH) QCLs provide the toughest durability under highly stressful operations. The leakage current of CMBH QCLs are also compared at different temperatures.
Horava gravity with mixed derivative terms
Colombo, Mattia; Sotiriou, Thomas P
2014-01-01
Horava gravity has been constructed so as to exhibit anisotropic scaling in the ultraviolet, as this renders the theory power-counting renormalizable. However, when coupled to matter, the theory has been shown to suffer from quadratic divergences. A way to cure these divergences is to add terms with both time and space derivatives. We consider this extended version of the theory in detail. We perform a perturbative analysis that includes all modes, determine the propagators and discuss how including mixed-derivative terms affects them. We also consider the Lifshitz scalar with mixed-derivative terms as a toy model for power counting arguments and discuss the influence of such terms on renormalizability.
Photochemistry of hypocrellin derivatives under anaerobic conditions
Institute of Scientific and Technical Information of China (English)
无
2000-01-01
To improve the red absorption and solubility of hypocrellin, we have synthesized a series of hypocrellin B derivatives. The photochemistry of these new compounds in anaerobic media has been investigated by using electronic paramagnetic resonance (EPR) and spectrophotometric methods. The semiquinone anion radicals can be produced by self-electron transfer on irradiation, with the formation efficiency and EPR hyperfine structures of the semiquinone anion radicals dependent on the structures of the derivatives. When an electron donor is present, the electron transfer from electron donor to hypocrellin B derivatives enhanced the production of the corresponding semiquinone anion radical; in addition, the semiquinone anion radical and hydroquinone can be detected spectrophotometrically. Structural modifications exert little effect on the absorption position of semiquinone anion radical and hydroquinone, but influence their formation efficiency significantly.
INTERPOLATION INEQUALITIES AND DECAY ESTIMATES FOR DERIVATIVES
Institute of Scientific and Technical Information of China (English)
Lu Xuguang
2000-01-01
Under the only assumption of the cone property for a given domain Ω∈Rn, it is proved that interpolation inequalities for intermediate derivatives of functions in the Sobolev spaces Wm,p (Ω) or even in some weighted Sobolve spaces Wwm,p (Ω) still hold. That is, the usual additional restrictions that Ω is bounded or has the uni form cone property are both removed. The main tools used are polynomial inequalities, by which it is also ob tained pointwise version interpolation inequalities for smooth and analytic functions. Such pointwise version in equalities give explicit decay estimates for derivatives at infinity in unbounded domains which have the cone property. As an application of the decay estimates, a previous result on radial basis function approximation of smooth functions is extended to the derivative-simultaneous approximation.
Hydrodynamic Nambu Brackets derived by Geometric Constraints
Blender, Richard
2015-01-01
A geometric approach to derive the Nambu brackets for ideal two-dimensional (2D) hydrodynamics is suggested. The derivation is based on two-forms with vanishing integrals in a periodic domain, and with resulting dynamics constrained by an orthogonality condition. As a result, 2D hydrodynamics with vorticity as dynamic variable emerges as a generic model, with conservation laws which can be interpreted as enstrophy and energy functionals. Generalized forms like surface quasi-geostrophy and fractional Poisson equations for the stream-function are also included as results from the derivation. The formalism is extended to a hydrodynamic system coupled to a second degree of freedom, with the Rayleigh-B\\'{e}nard convection as an example. This system is reformulated in terms of constitutive conservation laws with two additive brackets which represent individual processes: a first representing inviscid 2D hydrodynamics, and a second representing the coupling between hydrodynamics and thermodynamics. The results can b...
Funding climate adaptation strategies with climate derivatives
Directory of Open Access Journals (Sweden)
L. Richard Little
2015-01-01
Full Text Available Climate adaptation requires large capital investments that could be provided not only by traditional sources like governments and banks, but also by derivatives markets. Such markets would allow two parties with different tolerances and expectations about climate risks to transact for their mutual benefit and, in so doing, finance climate adaptation. Here we calculate the price of a derivative called a European put option, based on future sea surface temperature (SST in Tasmania, Australia, with an 18 °C strike threshold. This price represents a quantifiable indicator of climate risk, and forms the basis for aquaculture industries exposed to the risk of higher SST to finance adaptation strategies through the sale of derivative contracts. Such contracts provide a real incentive to parties with different climate outlooks, or risk exposure to take a market assessment of climate change.
Synthesis of Calix[4]resorcinarene Amide Derivatives
Institute of Scientific and Technical Information of China (English)
Chao Guo YAN; Yun GE
2004-01-01
Three different synthetic routes were developed to introduce carbamoyloxy functional groups at the upper periphery of two calix[4]resorcinarenes. By treating activated esters 2a-b with excess corresponding amine such as 3-(dimethylamino)propylamine 3, α-phenethylamine 4 and triethylenetetramine 5, six amide derivatives 6a~8b were obtained in high yield (Route 1). The pyridine-linked amide derivatives 9a-b were prepared by using acid chloride intermediate (Route 2). The amide derivatives 10a-b were obtained in moderate yields by direct alkylation of phenolic hydroxyl groups of 1a-b with N,N-dipropylchloroacetoamide in the presence of K2CO3/KI in acetone (Route 3).
Analytics of Quinine and its Derivatives.
Kluska, Mariusz; Marciniuk-Kluska, Anna; Prukała, Dorota; Prukała, Wiesław
2016-01-01
The objective of this study was to perform a synthesis and analysis of the most important information on quinine and its derivatives, which are still very important in the treatment of malaria. The analysis of stereoisomers of quinine and its derivatives was conducted using two techniques, high-performance liquid chromatography and capillary electrophoresis. Particularly noteworthy is the technique used for the determination of isotachophoresis, referred to as one of the so-called green chemistry techniques. Particular attention was paid to properties and the use of quinine and its derivatives in the treatment of malaria. The analytical part will supplement knowledge about quinidine, quinine, and cinchonidine, and will contribute to the growth of research on the so-much-needed drugs against malaria.
Real-time cosmography with redshift derivatives
Martins, C J A P; Calabrese, E; Ramos, M P L P
2016-01-01
The drift in the redshift of objects passively following the cosmological expansion has long been recognized as a key model-independent probe of cosmology. Here, we study the cosmological relevance of measurements of time or redshift derivatives of this drift, arguing that the combination of first and second redshift derivatives is a powerful test of the $\\Lambda$CDM cosmological model. In particular, the latter can be obtained numerically from a set of measurements of the drift at different redshifts. We show that, in the low-redshift limit, a measurement of the derivative of the drift can provide a constraint on the jerk parameter, which is $j=1$ for flat $\\Lambda$CDM, while generically $j\
Second derivatives for approximate spin projection methods.
Thompson, Lee M; Hratchian, Hrant P
2015-02-07
The use of broken-symmetry electronic structure methods is required in order to obtain correct behavior of electronically strained open-shell systems, such as transition states, biradicals, and transition metals. This approach often has issues with spin contamination, which can lead to significant errors in predicted energies, geometries, and properties. Approximate projection schemes are able to correct for spin contamination and can often yield improved results. To fully make use of these methods and to carry out exploration of the potential energy surface, it is desirable to develop an efficient second energy derivative theory. In this paper, we formulate the analytical second derivatives for the Yamaguchi approximate projection scheme, building on recent work that has yielded an efficient implementation of the analytical first derivatives.
Halogenated coumarin derivatives as novel seed protectants.
Brooker, N; Windorski, J; Bluml, E
2008-01-01
Development of new and improved antifungal compounds that are target-specific is backed by a strong Federal, public and commercial mandate. Many plant-derived chemicals have proven fungicidal properties, including the coumarins (1,2-Benzopyrone) found in a variety of plants such as clover, sweet woodruff and grasses. Preliminary research has shown the coumarins to be a highly active group of molecules with a wide range of antimicrobial activity against both fungi and bacteria. It is believed that these cyclic compounds behave as natural pesticidal defence molecules for plants and they represent a starting point for the exploration of new derivative compounds possessing a range of improved antifungal activity. Within this study, derivatives of coumarin that were modified with halogenated side groups were screened for their antifungal activity against a range of soil-borne plant pathogenic fungi. Fungi included in this in vitro screen included Macrophomina phaseolina (charcoal rot), Phytophthora spp. (damping off and seedling rot), Rhizoctonia spp. (damping off and root rot) and Pythium spp. (seedling blight), four phylogenetically diverse and economically important plant pathogens. Studies indicate that these halogenated coumarin derivatives work very effectively in vitro to inhibit fungal growth and some coumarin derivatives have higher antifungal activity and stability as compared to the original coumarin compound alone. The highly active coumarin derivatives are brominated, iodinated and chlorinated compounds and results suggest that besides being highly active, very small amounts can be used to achieve LD100 rates. In addition to the in vitro fungal inhibition assays, results of polymer seed coating compatibility and phytotoxicity testing using these compounds as seed treatments will also be reported. These results support additional research in this area of natural pesticide development.
Bootstrapping Density-Weighted Average Derivatives
DEFF Research Database (Denmark)
Cattaneo, Matias D.; Crump, Richard K.; Jansson, Michael
Employing the "small bandwidth" asymptotic framework of Cattaneo, Crump, and Jansson (2009), this paper studies the properties of a variety of bootstrap-based inference procedures associated with the kernel-based density-weighted averaged derivative estimator proposed by Powell, Stock, and Stoker......" variance estimator derived from the "small bandwidth" asymptotic framework. The results of a small-scale Monte Carlo experiment are found to be consistent with the theory and indicate in particular that sensitivity with respect to the bandwidth choice can be ameliorated by using the "robust...
Mesogenic benzothiazole derivatives with methoxy substituents
Indian Academy of Sciences (India)
A K Prajapati; N L Bonde
2006-03-01
Two new mesogenic homologous series containing 6-methoxybenzothiazole ring at the terminus of the molecule, viz. 2-(4'--alkoxyphenylazo)-6-methoxybenzothiazoles and 2-[4'-(4"--alkoxybenzoyloxy) phenylazo]-6-methoxybenzothiazoles were synthesized. In series I, -butyloxy to -tetradecyloxy derivatives exhibit nematic mesophase. Smectic A mesophase commences from the -dodecyloxy derivative as a monotropic phase and is retained up to the last member synthesized. All the members of series II exhibit enantiotropic nematic mesophase. The mesomorphic properties of the present series are compared with other structurally related series to evaluate the effect of the benzothiazole ring and the methoxy substituent on mesomorphism.
Photoluminescence in anthracene and it's derivatives
Vyas, Arpita; Mirgane, Nitin A.; Moharil, S. V.; Muley, Aarti Iyer
2016-05-01
The anthracene and it's derivative 9-chloro acridine and Anthracene-9-ylmethylacetate have prepared in Poly vinyl alcohol(PVOH). Their photoluminescence properties have studied. The pure anthracene has an emission at 424 and 443nm. The intense peak is observed at 465nm and shoulder at 407nm. The derivatives of anthracene Anthracene-9-ylmethylacetate shows an emission around 440nm for the excitation at 393nm and 9-chloro acridine shows emission around 360nm for the excitation at 290nm. The major problem of this organic material is the stability. The composites prepared in the medium of PVOH are more stable.
Scale up of proteoliposome derived Cochleate production.
Zayas, Caridad; Bracho, Gustavo; Lastre, Miriam; González, Domingo; Gil, Danay; Acevedo, Reinaldo; del Campo, Judith; Taboada, Carlos; Solís, Rosa L; Barberá, Ramón; Pérez, Oliver
2006-04-12
Cochleate are highly stable structures with promising immunological features. Cochleate structures are usually obtaining from commercial lipids. Proteoliposome derived Cochleate are derived from an outer membrane vesicles of Neisseria meningitidis B. Previously, we obtained Cochleates using dialysis procedures. In order to increase the production process, we used a crossflow system (CFS) that allows easy scale up to obtain large batches in an aseptic environment. The raw material and solutions used in the production process are already approved for human application. This work demonstrates that CFS is very efficient process to obtain Cochleate structures with a yield of more than 80% and the immunogenicity comparable to that obtained by dialysis membrane.
Special relativity derived from spacetime magma.
Directory of Open Access Journals (Sweden)
Fred Greensite
Full Text Available We present a derivation of relativistic spacetime largely untethered from specific physical considerations, in constrast to the many physically-based derivations that have appeared in the last few decades. The argument proceeds from the inherent magma (groupoid existing on the union of spacetime frame components [Formula: see text] and Euclidean [Formula: see text] which is consistent with an "inversion symmetry" constraint from which the Minkowski norm results. In this context, the latter is also characterized as one member of a class of "inverse norms" which play major roles with respect to various unital [Formula: see text]-algebras more generally.
Special relativity derived from spacetime magma.
Greensite, Fred
2014-01-01
We present a derivation of relativistic spacetime largely untethered from specific physical considerations, in constrast to the many physically-based derivations that have appeared in the last few decades. The argument proceeds from the inherent magma (groupoid) existing on the union of spacetime frame components [Formula: see text] and Euclidean [Formula: see text] which is consistent with an "inversion symmetry" constraint from which the Minkowski norm results. In this context, the latter is also characterized as one member of a class of "inverse norms" which play major roles with respect to various unital [Formula: see text]-algebras more generally.
Synthesis and Antidiabetic Evaluation of Benzothiazole Derivatives
Energy Technology Data Exchange (ETDEWEB)
G, Mariappan; P, Prabhat; L, Sutharson; J, Banerjee; U, Patangia; S, Nath [Himalayan Pharmacy Institute, Majhitar (India)
2012-04-15
A novel series of benzothiazole derivatives were synthesized and assayed in vivo to investigate their hypogly-cemic activity by streptozotocin-induced diebetic model in rat. These derivatives showed considerable biological efficacy when compared to glibenclamide, a potent and well known antidiabetic agent as a reference drug. All the compounds were effective, amongst them 3d showed more prominent activity at 100 mg/kg p.o. The experimental results are statistically significant at p<0.01 and p<0.05 level.
Antiretroviral (HIV-1) activity of azulene derivatives.
Peet, Julia; Selyutina, Anastasia; Bredihhin, Aleksei
2016-04-15
The antiretroviral activity of azulene derivatives was detected for the first time. A series of eighteen diversely substituted azulenes was synthesized and tested in vitro using HIV-1 based virus-like particles (VLPs) and infectious HIV-1 virus in U2OS and TZM-bl cell lines. Among the compounds tested, the 2-hydroxyazulenes demonstrated the most significant activity by inhibiting HIV-1 replication with IC50 of 2-10 and 8-20 μM for the VLPs and the infectious virus, respectively. These results indicate that azulene derivatives may be potentially useful candidates for the development of antiretroviral agents.
Derivation of Mayer Series from Canonical Ensemble
Wang, Xian-Zhi
2016-02-01
Mayer derived the Mayer series from both the canonical ensemble and the grand canonical ensemble by use of the cluster expansion method. In 2002, we conjectured a recursion formula of the canonical partition function of a fluid (X.Z. Wang, Phys. Rev. E 66 (2002) 056102). In this paper we give a proof for this formula by developing an appropriate expansion of the integrand of the canonical partition function. We further derive the Mayer series solely from the canonical ensemble by use of this recursion formula.
Derivation of sink strengths in bounded media
Energy Technology Data Exchange (ETDEWEB)
Brailsford, A.D. (Ford Motor Co., Dearborn, MI (USA). Engineering and Research Staff)
1981-11-01
Several reasons for the need to extend the rate theory of point defect recovery processes to bounded media are cited. This paper is concerned with the essential first step, the derivation of the strength of sinks near a free surface. The Effective Medium method is used. Sink strengths so derived are shown to be formally the same as those found in an unbounded system. Image effects associated with the surface are proved to be small when the sink is located more than a few sink radii from the surface.
On Dirichlet's Derivation of the Ellipsoid Potential
Dittrich, W
2016-01-01
Newton's potential of a massive homogeneous ellipsoid is derived via Dirichlet's discontinuous factor. At first we review part of Dirichlet's work in an English translation of the original German, and then continue with an extension of his method into the complex plane. With this trick it becomes possible to first calculate the potential and thereafter the force components exerted on a test mass by the ellipsoid. This is remarkable in so far as all other famous researchers prior to Dirichlet merely calculated the attraction components. Unfortunately, Dirichlet's derivation is to a large extent mathematically unacceptable which, however, can be corrected by treating the problem in the complex plane.
High ethanol producing derivatives of Thermoanaerobacter ethanolicus
Ljungdahl, Lars G.; Carriera, Laura H.
1983-01-01
Derivatives of the newly discovered microorganism Thermoanaerobacter ethanolicus which under anaerobic and thermophilic conditions continuously ferment substrates such as starch, cellobiose, glucose, xylose and other sugars to produce recoverable amounts of ethanol solving the problem of fermentations yielding low concentrations of ethanol using the parent strain of the microorganism Thermoanaerobacter ethanolicus are disclosed. These new derivatives are ethanol tolerant up to 10% (v/v) ethanol during fermentation. The process includes the use of an aqueous fermentation medium, containing the substrate at a substrate concentration greater than 1% (w/v).
Quantum mechanics of 4-derivative theories
Energy Technology Data Exchange (ETDEWEB)
Salvio, Alberto [Universidad Autonoma de Madrid and Instituto de Fisica Teorica IFT-UAM/CSIC, Departamento de Fisica Teorica, Madrid (Spain); Strumia, Alessandro [Dipartimento di Fisica, Universita di Pisa (Italy); CERN, Theory Division, Geneva (Switzerland); INFN, Pisa (Italy)
2016-04-15
A renormalizable theory of gravity is obtained if the dimension-less 4-derivative kinetic term of the graviton, which classically suffers from negative unbounded energy, admits a sensible quantization. We find that a 4-derivative degree of freedom involves a canonical coordinate with unusual time-inversion parity, and that a correspondingly unusual representation must be employed for the relative quantum operator. The resulting theory has positive energy eigenvalues, normalizable wavefunctions, unitary evolution in a negative-norm configuration space. We present a formalism for quantum mechanics with a generic norm. (orig.)
Derivation of the blackfold effective theory
Camps, Joan
2012-01-01
We study fluctuations and deformations of black branes over length scales larger than the horizon radius. We prove that the Einstein equations for the perturbed p-brane yield, as constraints, the equations of the effective blackfold theory. We solve the Einstein equations for the perturbed geometry and show that it remains regular on and outside the black brane horizon. This study provides an ab initio derivation of the blackfold effective theory and gives explicit expressions for the metrics near the new black holes and black branes that result from it, to leading order in a derivative expansion.
Synthesis and Characterization of Two Danazol Derivatives
Directory of Open Access Journals (Sweden)
Lauro Figueroa-Valverde
2010-01-01
Full Text Available Two danazol derivatives were synthesized and characterized by spectral analyses. In order to characterize the structural and chemical requirements of danazol derivatives, several parameters such as logP, π, Rm and Vm were evaluated. The results showed an increase in the values of logP for the compound 6 in comparison with 3. The compound 3 showed an increase in the values of π, R Vm and V Vm with respect to 6. These data indicate a high degree of lipophilicity and a low steric impediment for compound 6 in comparison with 3.
Method of thermal derivative gradient analysis (TDGA
Directory of Open Access Journals (Sweden)
M. Cholewa
2009-07-01
Full Text Available In this work a concept of thermal analysis was shown, using for crystallization kinetics description the temperature derivatives after time and direction. Method of thermal derivative gradient analysis (TDGA is assigned for alloys and metals investigation as well as cast composites in range of solidification. The construction and operation characteristics were presented for the test stand including processing modules and probes together with thermocouples location. Authors presented examples of results interpretation for AlSi11 alloy castings with diversified wall thickness and at different pouring temperature.
Access to new antimicrobial 4-methylumbelliferone derivatives
Indian Academy of Sciences (India)
Marwa Zayane; Anis Romdhane; Mejda Daami-Remadi; Hichem Ben Jannet
2015-09-01
Synthesis of some novel coumarin esters has been accomplished through iodine-catalyzed method using 4-methylumbelliferone as the starting material. Condensation of hydrazide, which was obtained in two steps from 4-methylumbelliferone, with some arylaldhydes provided hydrazone derivatives, while the reaction with phenylthioisocyanate leads to the thiosemicarbazide that evolved into two new compounds. Finally, condensation reaction of hydrazide with three diketones afforded new pyrrole and pyrazole derivatives. Structures of all synthesized compounds were established on the basis of spectroscopic methods including 1H NMR, 13C NMR and ES-HRMS. They were finally tested for their antimicrobial activity and the structure-activity relationship was discussed.
Terpenes from marine-derived fungi.
Ebel, Rainer
2010-08-13
Terpenes from marine-derived fungi show a pronounced degree of structural diversity, and due to their interesting biological and pharmacological properties many of them have aroused interest from synthetic chemists and the pharmaceutical industry alike. The aim of this paper is to give an overview of the structural diversity of terpenes from marine-derived fungi, highlighting individual examples of chemical structures and placing them in a context of other terpenes of fungal origin. Wherever possible, information regarding the biological activity is presented.
Quantum mechanics of 4-derivative theories.
Salvio, Alberto; Strumia, Alessandro
2016-01-01
A renormalizable theory of gravity is obtained if the dimension-less 4-derivative kinetic term of the graviton, which classically suffers from negative unbounded energy, admits a sensible quantization. We find that a 4-derivative degree of freedom involves a canonical coordinate with unusual time-inversion parity, and that a correspondingly unusual representation must be employed for the relative quantum operator. The resulting theory has positive energy eigenvalues, normalizable wavefunctions, unitary evolution in a negative-norm configuration space. We present a formalism for quantum mechanics with a generic norm.
DEFF Research Database (Denmark)
Cao, Yong-Xiao; Zheng, Jian-Pu; He, Jian-Yu;
2005-01-01
The purpose of this study was to investigate the effect of atropine on peripheral vasodilation and the mechanisms involved. The isometric tension of rat mesenteric artery rings was recorded in vitro on a myograph. The results showed that atropine, at concentrations greater than 1 microM, relaxed...... the contraction derived from NA and CaCI2 in Ca(2+)-free medium, in a concentration dependent manner, indicating the vasodilatation was related to the inhibition of extracellular Ca2+ influx through the receptor-operated calcium channels and intracellular Ca2+ release from the Ca2+ store. Atropine had no effect...... on the caffeine-induced contraction in the artery segments, indicating the inhibition of intracellular Ca2+ release as a result of atropine most likely occurs via the IP3 pathway rather than the ryanodine receptors. Our results suggest that atropine-induced vasodilatation is mainly from artery smooth muscle cells...
Teng, Jinn-Tsair; Cárdenas-Barrón, Leopoldo Eduardo; Lou, Kuo-Ren; Wee, Hui Ming
2013-05-01
In this article, we first complement an inappropriate mathematical error on the total cost in the previously published paper by Chung and Wee [2007, 'Optimal the Economic Lot Size of a Three-stage Supply Chain With Backlogging Derived Without Derivatives', European Journal of Operational Research, 183, 933-943] related to buyer-distributor-vendor three-stage supply chain with backlogging derived without derivatives. Then, an arithmetic-geometric inequality method is proposed not only to simplify the algebraic method of completing prefect squares, but also to complement their shortcomings. In addition, we provide a closed-form solution to integral number of deliveries for the distributor and the vendor without using complex derivatives. Furthermore, our method can solve many cases in which their method cannot, because they did not consider that a squared root of a negative number does not exist. Finally, we use some numerical examples to show that our proposed optimal solution is cheaper to operate than theirs.
Effect of Atropine on Local Skin Wettedness and Sensible Heat Loss,
1984-12-01
both a and B-blockers. When the a receptor was preferentially blocked with phentolamine , vasoconstriction converted to vasodilation (154% increase in...in the forearm treated with phentolamine . Brick and co-workers’ study (5) indicates that NE action in the forearm is the sum of a dominant
Central blockade of (methyl-)atropine on carbachol drinking: A dose-response study
Terpstra, G.K.; Slangen, J.L.
1972-01-01
Administration of carbachol in the tractus diagonalis in rats elicited drinking and no eating. Norepinephrine administered in the same place did not induce drinking or eating. The specific drinking response induced by stimulation with 7.2 nmol (= 1.3 μg) of carbachol was gradually inhibited by prece
A.F.L. Schinkel (Arend); A. Elhendy (Abdou); J.J. Bax (Jeroen); E.C. Vourvouri (Eleni); F. Sozzi (Fabiola); R. Valkema (Roelf); D. Poldermans (Don); J.R.T.C. Roelandt (Jos); R.T. van Domburg (Ron)
2002-01-01
textabstractOBJECTIVE: Exercise tolerance in patients with diabetes is frequently impaired due to noncardiac disease such as claudication and polyneuropathy. This study assesses the prognostic value of dobutamine stress myocardial perfusion imaging in patients with diabetes. RESEAR
1982-04-01
the optical stimulus and measurement systems of the SRI optometer (Cornsweet & Crane, 1970) using a bite bar independently adjustable for the x, y...and z axes. Fixation targets were 10/40 size Landolt C’s having a contrast of 70Z and a background luminance of 3.5 cd/m 2. To calibrate the optometer
Joosen, M.J.A.; Schans, M.J. van der; Helden, H.P.M. van
2010-01-01
The nerve agent VX is most likely to enter the body via liquid contamination of the skin. After percutaneous exposure, the slow uptake into the blood, and its slow elimination result in toxic levels in plasma for a period of several hours. Consequently, this has implications for the development of t
Intramolecular Cycloaddition of Imines of Cysteine Derivatives
Directory of Open Access Journals (Sweden)
Teresa M. V. D. Pinho e Melo
1998-02-01
Full Text Available Azomethine ylides were generated from Schiffs bases of S-allylcysteine methyl ester and their intramolecular 1,3-dipolar cycloadditions were studied. These reactions led to the synthesis of thieno[3,4-b]pyrrole derivatives in good yield.
Generalized Jackknife Estimators of Weighted Average Derivatives
DEFF Research Database (Denmark)
Cattaneo, Matias D.; Crump, Richard K.; Jansson, Michael
With the aim of improving the quality of asymptotic distributional approximations for nonlinear functionals of nonparametric estimators, this paper revisits the large-sample properties of an important member of that class, namely a kernel-based weighted average derivative estimator. Asymptotic...
Derived Transformation of Children's Pregambling Game Playing
Dymond, Simon; Bateman, Helena; Dixon, Mark R.
2010-01-01
Contemporary behavior-analytic perspectives on gambling emphasize the impact of verbal relations, or derived relational responding and the transformation of stimulus functions, on the initiation and maintenance of gambling. Approached in this way, it is possible to undertake experimental analysis of the role of verbal/mediational variables in…
Endothelial derived hyperpolarization in renal interlobar arteries
DEFF Research Database (Denmark)
Brasen, Jens Christian; Sørensen, Charlotte M.
2015-01-01
In small arteries, vascular smooth muscle cells (VSMCs) and endothelial cells (ECs) are connect by myoendothelial junctions (MEJ), usually extending from the EC. Ca2+ activated K+ channels (IKCa and SKCa) located in the MEJ are suggested to play a role in NO-independent endothelium derived...
Glycosylation of a Newly Functionalized Orthoester Derivative
Directory of Open Access Journals (Sweden)
Kohei Kawa
2014-02-01
Full Text Available Tandem glycosylation of the 6-O-Fmoc-substituted benzyl orthoester derivative 2a was carried out in moderate yields by electrogenerated acid (EGA. The Fmoc group was effectively removed under mild basic conditions, and the product was submitted to the subsequent glycosylation.
Synthesis and Characterization of Novel Sulfonylurea Derivatives
Institute of Scientific and Technical Information of China (English)
ZHANG Guang-liang; LI Yao-xian; ZHANG Suo-qin; GAO Fei-fei
2005-01-01
On the basis of study on the mechanism of action of sulfonylurea herbicides, nine sulfonylurea derivatives of iso-xazolidinone were designed and synthesized. The structures of these compounds were confirmed by means of IR, MS, NMR and elemental analysis. The results of preliminary active tests indicate that the compounds have some herbicidal activity. The structure-activity relationship was also studied.
Deriving force field parameters for coordination complexes
DEFF Research Database (Denmark)
Norrby, Per-Ola; Brandt, Peter
2001-01-01
The process of deriving molecular mechanics force fields for coordination complexes is outlined. Force field basics are introduced with an emphasis on special requirements for metal complexes. The review is then focused on how to set up the initial model, define the target, refine the parameters,...
Interest Rate Derivative Pricing with Stochastic Volatility
Chen, B.
2012-01-01
One purpose of exotic derivative pricing models is to enable financial institutions to quantify and manage their financial risk, arising from large books of portfolios. These portfolios consist of many non-standard exotic financial products. Risk is managed by means of the evaluation of sensitivity
Derivation of the Ideal Gas Law
Laugier, Alexander; Garai, Jozsef
2007-01-01
Undergraduate and graduate physics and chemistry books usually state that combining the gas laws results in the ideal gas law. Leaving the derivation to the students implies that this should be a simple task, most likely a substitution. Boyle's law, Charles's law, and the Avogadro's principle are given under certain conditions; therefore, direct…
New sulphide derivative from Ferula rutabensis.
Abdel-Sattar, Essam; El-Mekkawy, Sahar
2009-01-01
Reinvestigation of CH(2)Cl(2) extract of roots and rhizomes of Ferula rutabensis led to the isolation of a new trisulphide (1) and phthalic acid derivative (2). Their characterisation was based on their spectral data, including MS, 1D- and 2D-NMR.
Organogels Derived from Potassium 8-Nitroquinolinecarboxylate
Institute of Scientific and Technical Information of China (English)
HU,Hai-Yu; YANG,Yong; XIANG,Jun-Feng; CHEN,Chuan-Feng
2007-01-01
A new class of organogels derived from potassium 8-nitroquinoline-2-carboxylate was selectively formed in (V∶ V= 1∶ 1) THF/MeOH, and their superstructures were characterized by atomic force microscopy, scanning electron microscopy and transmission electron microscopy.
Econometric Analysis of Financial Derivatives : An overview
C-L. Chang (Chia-Lin); M.J. McAleer (Michael)
2014-01-01
markdownabstract__Abstract__ One of the fastest growing areas in empirical finance, and also one of the least rigorously analyzed, especially from a financial econometrics perspective, is the econometric analysis of financial derivatives, which are typically complicated and difficult to analyze. Th
New lycosinine derivative from Hippeastrum breviflorum
Directory of Open Access Journals (Sweden)
Camila Sebben
2015-08-01
Full Text Available AbstractA new lycosinine derivative, 9-O-demethyllycosinine B, was isolated from the native Brazilian Hippeastrum breviflorumHerb., Amaryllidaceae, along with the well-known alkaloids lycosinine B and lycorine. The structure of the new compound was established by physical and spectroscopic methods. 9-O-demethyllycosinine B is the third lycosinine variant identified in the Amaryllidaceae family.
[Sulphonylurea derivatives or insulin with metformin?
Tack, C.J.; Laar, F.A. van de
2014-01-01
If pharmacological treatment of glycaemia with metformin in patients with type 2 diabetes fails, a second agent is advised, however, the optimal choice is unclear. Most guidelines suggest the addition of sulphonylurea (SU) derivatives as the first option, but sometimes insulin is preferred as there
Generalized Voigt functions and their derivatives
Energy Technology Data Exchange (ETDEWEB)
Sampoorna, M. [Indian Institute of Astrophysics, Koramangala, Bangalore 560 034 (India) and Laboratoire Cassiopee (CNRS, UMR 6202), Observatoire de la Cote d' Azur, BP 4229, F-06304 Nice Cedex 4 (France)]. E-mail: sampoorna@iiap.res.in; Nagendra, K.N. [Indian Institute of Astrophysics, Koramangala, Bangalore 560 034 (India); Laboratoire Cassiopee (CNRS, UMR 6202), Observatoire de la Cote d' Azur, BP 4229, F-06304 Nice Cedex 4 (France); Frisch, H. [Laboratoire Cassiopee (CNRS, UMR 6202), Observatoire de la Cote d' Azur, BP 4229, F-06304 Nice Cedex 4 (France)
2007-03-15
This paper deals with a special class of functions called generalized Voigt functions H{sup (n)}(x,a) and G{sup (n)}(x,a) and their partial derivatives, which are useful in the theory of polarized spectral line formation in stochastic media. For n=0 they reduce to the usual Voigt and Faraday-Voigt functions H(x,a) and G(x,a). A detailed study is made of these new functions. Simple recurrence relations are established and employed for the calculation of the functions themselves and of their partial derivatives. Asymptotic expansions are given for large values of x and a. They are used to examine the range of applicability of the recurrence relations and to construct a numerical algorithm for the calculation of the generalized Voigt functions and of their derivatives valid in a large (x,a) domain. It is also shown that the partial derivatives of the usual H(x,a) and G(x,a) can be expressed in terms of H{sup (n)}(x,a) and G{sup (n)}(x,a)
Chemistry of Phosphorylated Formaldehyde Derivatives. Part I
Directory of Open Access Journals (Sweden)
Vasily P. Morgalyuk
2014-08-01
Full Text Available The underinvestigated derivatives of unstable phosphorylated formaldehyde acetals and some of the structurally related compounds, such as thioacetals, aminonitriles, aminomethylphosphinoyl compounds, are considered. Separately considered are halogen aminals of phosphorylated formaldehyde, acetals of phosphorylated formaldehyde of H-phosphinate-type and a phosphorylated gem-diol of formaldehyde. Synthetic methods, chemical properties and examples of practical applications are given.
Efficient pricing algorithms for exotic derivatives
R. Lord (Roger)
2008-01-01
textabstractSince the Nobel-prize winning papers of Black and Scholes and Merton in 1973, the derivatives market has evolved into a multi-trillion dollar market. Structures which were once considered as exotic are now commonplace, appearing in retail products such as mortgages and investment notes.
Orchard navigation using derivative free Kalman filtering
DEFF Research Database (Denmark)
Hansen, Søren; Bayramoglu, Enis; Andersen, Jens Christian
2011-01-01
This paper describes the use of derivative free filters for mobile robot localization and navigation in an orchard. The localization algorithm fuses odometry and gyro measurements with line features representing the surrounding fruit trees of the orchard. The line features are created on basis of 2...
Risk Management and Financial Derivatives: An Overview
S.M. Hammoudeh (Shawkat); M.J. McAleer (Michael)
2012-01-01
textabstractRisk management is crucial for optimal portfolio management. One of the fastest growing areas in empirical finance is the expansion of financial derivatives. The purpose of this special issue on “Risk Management and Financial Derivatives” is to highlight some areas in which novel econome
A novel chalcone derivative from Onychium japonicum
Institute of Scientific and Technical Information of China (English)
无
2007-01-01
A novel chalcone derivative was isolated from Onychium japonicum and its structure was elucidated by spectroscopic methods.The isolated compound showed cytotoxic activity against the human carcinoma cell lines Hela and BEL-7402 in vitro.(C) 2007 Hong Quan Duan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
ANTIMICROBIAL POTENT OXAZINE-2-AMINE DERIVATIVES
Directory of Open Access Journals (Sweden)
GANESAMOORTHY THIRUNARAYANAN
2016-07-01
Full Text Available Objective: To synthesize thirteen effective microbial potent oxazine-2-amine derivatives and evaluate the antimicrobial activities of these compounds. Material and methods: The solvent-free solid fly-ash: H2SO4 catalyzed cyclization of 4-bromo-1-naphthyl chalcones and urea under microwave irradiation technique was utilized for the synthesis of oxazine derivatives. The synthesized oxazines were characterized by their physical constants and spectroscopic data. The Bauer-Kirby disc-diffusion method of measurement of zone of inhibition was used for evaluation antimicrobial activity of synthesized oxazines. Results: The cyclization was effective and this reaction gave more than 80% yield. The catalyst was reused up to five times consecutively without appreciable decreasing of yield. All compounds were active against their microbial strains. Conclusions: This solvent-free synthetic method was effective for the synthesis of oxazine derivatives. The amino, dimethylamino, halogens, methoxy and methyl substituted oxazines shows significant antibacterial activity. Chloro, hydroxy and nitro substituted oxazine derivative have shown significant antifungal activity.
Microscopic Derivation of Ginzburg-Landau Theory
DEFF Research Database (Denmark)
Frank, Rupert; Hainzl, Christian; Seiringer, Robert
2012-01-01
We give the first rigorous derivation of the celebrated Ginzburg-Landau (GL) theory, starting from the microscopic Bardeen-Cooper-Schrieffer (BCS) model. Close to the critical temperature, GL arises as an effective theory on the macroscopic scale. The relevant scaling limit is semiclassical...
Potentials of Arbitrary Forces with Fractional Derivatives
Rabei, Eqab M.; Alhalholy, Tareq S.; Rousan, Akram
The Laplace transform of fractional integrals and fractional derivatives is used to develop a general formula for determining the potentials of arbitrary forces: conservative and nonconservative in order to introduce dissipative effects (such as friction) into Lagrangian and Hamiltonian mechanics. The results are found to be in exact agreement with Riewe's results of special cases. Illustrative examples are given.
46 CFR 503.55 - Derivative classification.
2010-10-01
... markings prescribed by 32 CFR 2001.20 through 2001.23 and shall otherwise conform to the requirements of 32 CFR 2001.20 through 2001.23. ... 46 Shipping 9 2010-10-01 2010-10-01 false Derivative classification. 503.55 Section...
5 CFR 1312.7 - Derivative classification.
2010-01-01
... 5 Administrative Personnel 3 2010-01-01 2010-01-01 false Derivative classification. 1312.7 Section 1312.7 Administrative Personnel OFFICE OF MANAGEMENT AND BUDGET OMB DIRECTIVES CLASSIFICATION, DOWNGRADING, DECLASSIFICATION AND SAFEGUARDING OF NATIONAL SECURITY INFORMATION Classification...
Curcumin derivatives as HIV-1 protease inhibitors
Energy Technology Data Exchange (ETDEWEB)
Sui, Z.; Li, J.; Craik, C.S.; Ortiz de Montellano, P.R. [Univ. of California, San Francisco, CA (United States)
1993-12-31
Curcumin, a non-toxic natural compound from Curcuma longa, has been found to be an HIV-1 protease inhibitor. Some of its derivatives were synthesized and their inhibitory activity against the HIV-1 protease was tested. Curcumin analogues containing boron enhanced the inhibitory activity. At least of the the synthesized compounds irreversibly inhibits the HIV-1 protease.
Current-induced forces: a simple derivation
DEFF Research Database (Denmark)
Todorov, Tchavdar N.; Dundas, Daniel; Lü, Jing-Tao;
2014-01-01
We revisit the problem of forces on atoms under current in nanoscale conductors. We derive and discuss the five principal kinds of force under steady-state conditions from a simple standpoint that-with the help of background literature-should be accessible to physics undergraduates. The discussion...
Simple Derivation of the Lindblad Equation
Pearle, Philip
2012-01-01
The Lindblad equation is an evolution equation for the density matrix in quantum theory. It is the general linear, Markovian, form which ensures that the density matrix is Hermitian, trace 1, positive and completely positive. Some elementary examples of the Lindblad equation are given. The derivation of the Lindblad equation presented here is…
Enabling quaternion derivatives: the generalized HR calculus.
Xu, Dongpo; Jahanchahi, Cyrus; Took, Clive C; Mandic, Danilo P
2015-08-01
Quaternion derivatives exist only for a very restricted class of analytic (regular) functions; however, in many applications, functions of interest are real-valued and hence not analytic, a typical case being the standard real mean square error objective function. The recent HR calculus is a step forward and provides a way to calculate derivatives and gradients of both analytic and non-analytic functions of quaternion variables; however, the HR calculus can become cumbersome in complex optimization problems due to the lack of rigorous product and chain rules, a consequence of the non-commutativity of quaternion algebra. To address this issue, we introduce the generalized HR (GHR) derivatives which employ quaternion rotations in a general orthogonal system and provide the left- and right-hand versions of the quaternion derivative of general functions. The GHR calculus also solves the long-standing problems of product and chain rules, mean-value theorem and Taylor's theorem in the quaternion field. At the core of the proposed GHR calculus is quaternion rotation, which makes it possible to extend the principle to other functional calculi in non-commutative settings. Examples in statistical learning theory and adaptive signal processing support the analysis.
Theoretical derivation of heliostat tracking errors distribution
Energy Technology Data Exchange (ETDEWEB)
Badescu, Viorel [Candida Oancea Institute of Solar Energy, Faculty of Mechanical Engineering, Polytechnic University of Bucharest, Spl. Independentei 313, Bucharest 060042 (Romania)
2008-12-15
The tracking error probability distribution is derived on a pure theoretical basis. Methods of integral geometry and geometrical probabilities are used to this purpose. The distribution performs reasonably well when compared with measurements from a small database. The performance of the theoretical distribution is compared with that of other (empirical) probability distributions. The practical relevance of using the present approach is also explained. (author)
Actuarial risk measures for financial derivative pricing
M.J. Goovaerts; R.J.A. Laeven
2008-01-01
We present an axiomatic characterization of price measures that are superadditive and comonotonic additive for normally distributed random variables. The price representation derived involves a probability measure transform that is closely related to the Esscher transform, and we call it the Esscher
Synthesis of isothiocyanate-derived mercapturic acids
Vermeulen, M.; Zwanenburg, B.; Chittenden, G.J.F.; Verhagen, H.
2003-01-01
Twelve mercapturic acids derived from saturated and unsaturated aliphatic and aromatic isothiocyanates were synthesised, by adding isothiocyanate to a solution of N-acetyl-L-cysteine and sodium bicarbonate, in a typical yield of 77%. Isothiocyanates were synthesised first by adding the corresponding
Approximate methods for derivation of covariance data
Energy Technology Data Exchange (ETDEWEB)
Tagesen, S. [Vienna Univ. (Austria). Inst. fuer Radiumforschung und Kernphysik; Larson, D.C. [Oak Ridge National Lab., TN (United States)
1992-12-31
Several approaches for the derivation of covariance information for evaluated nuclear data files (EFF2 and ENDF/B-VI) have been developed and used at IRK and ORNL respectively. Considerations, governing the choice of a distinct method depending on the quantity and quality of available data are presented, advantages/disadvantages are discussed and examples of results are given.
Ethos Derived from Karaoke Performance in Taiwan.
Ma, Ringo
Karaoke (singing along to music videos) has swept Taiwan with such force that many people go to singing schools to improve their singing. Three cases in this paper demonstrate how the ethos, or credibility, of the singer is a combination of initial and derived ethos. Who the singer is tends to determine how much attention he or she receives…
Higher-Derivative Supergravity and Moduli Stabilization
Energy Technology Data Exchange (ETDEWEB)
Ciupke, David; Westphal, Alexander [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Theory Group; Louis, Jan [Hamburg Univ. (Germany). Fachberich Physik; Hamburg Univ. (Germany). Zentrum fuer Mathematische Physik
2015-05-15
We review the ghost-free four-derivative terms for chiral superfields in N=1 supersymmetry and supergravity. These terms induce cubic polynomial equations of motion for the chiral auxiliary fields and correct the scalar potential. We discuss the different solutions and argue that only one of them is consistent with the principles of effective field theory. Special attention is paid to the corrections along flat directions which can be stabilized or destabilized by the higher-derivative terms. We then compute these higher-derivative terms explicitly for the type IIB string compactified on a Calabi-Yau orientifold with fluxes via Kaluza-Klein reducing the (α'){sup 3}R{sup 4} corrections in ten dimensions for the respective N=1 Kaehler moduli sector. We prove that together with flux and the known (α'){sup 3}-corrections the higher-derivative term stabilizes all Calabi-Yau manifolds with positive Euler number, provided the sign of the new correction is negative.
Synthesis and application of epoxy starch derivatives
Huijbrechts, A.M.L.; Haar, ter R.; Schols, H.A.; Franssen, M.C.R.; Boeriu, C.G.; Sudhölter, E.J.R.
2010-01-01
Epoxy starch derivatives were synthesized by epoxidation of allylated starch. The reaction was performed with low substituted 1-allyloxy-2-hydroxypropyl-waxy maize starch (AHP-WMS; degree of substitution (DS) of 0.23) using hydrogen peroxide and acetonitrile Via a two step spectrophotometric assay,
Diclofenac derivatives with insulin-sensitizing activity
Institute of Scientific and Technical Information of China (English)
Jian Ta Wang; Ying Wang; Ji Quan Zhang; Xing Cui; Yi Zhang; Gao Feng Zhu; Lei Tang
2011-01-01
A series of diclofenac derivatives were synthesized. The insulin-sensitizing activity of 28 new compounds was evaluated in 3T3-L1 cells. The compounds 10a and 10f exhibited similar insulin-sensitizing activity with positive drag rosiglitazone.
Sol-Gel Derived Hafnia Coatings
Feldman, Jay D.; Stackpoole, Mairead; Blum, Yigal; Sacks, Michael; Ellerby, Don; Johnson, Sylvia M.; Venkatapathy, Ethiras (Technical Monitor)
2002-01-01
Sol-gel derived hafnia coatings are being developed to provide an oxidation protection layer on ultra-high temperature ceramics for potential use in turbine engines (ultra-efficient engine technology being developed by NASA). Coatings using hafnia sol hafnia filler particles will be discussed along with sol synthesis and characterization.
Synthesis of novel 15-membered macrolide derivatives
Institute of Scientific and Technical Information of China (English)
Rui Qing Xian; Shu Tao Ma; Bo Jiao
2008-01-01
In order to develop new antibiotics effective against resistant bacteria,a series of novel 15-membered macrolide derivatives were designed and synthesized by the modification of hydroxyl groups at C-11,C-12 and C-4" positions.Their structures were confirmed by MS,IR,1H NMR or 13C NMR.
$\\Phi$-derivable approximations in gauge theories
Arrizabalaga, A
2003-01-01
We discuss the method of $\\Phi$-derivable approximations in gauge theories. There, two complications arise, namely the violation of Bose symmetry in correlation functions and the gauge dependence. For the latter we argue that the error introduced by the gauge dependent terms is controlled, therefore not invalidating the method.
Supersymmetric higher derivative couplings and their applications
Lodato, I.
2014-01-01
After an elementary introduction on black hole physics, supersymmetry and effective theories, which motivates the importance of higher derivative couplings in supergravity, we give an exhaustive treatment of the covariant phase space formalism with many examples explicitly worked out. This sets the
Synthesis of [60]Fullerene-Podophyllotoxin Derivative
Institute of Scientific and Technical Information of China (English)
GUO,Li-Wei(郭礼伟); GAO,Xiang(高翔); ZHANG,Dan-Wei(张丹维); WU,Shi-Hui(吴世晖); WU,Hou-Ming(吴厚铭)
2002-01-01
The [60]fullerene-podophyllotoxin derivative (3) was obtained by the phosphine promeoted[2 + 3]cycloaddition reaction ofpodophyllotoxin buta-2,3-dienoate (2) and [60]fullerene. The structures of starting mateerial (2) and product (3) were confirmed by UV-vis, IR, NMR and MS spectroscopies.
Derivation of a poroelastic flexural shell model
Mikelic, Andro
2015-01-01
In this paper we investigate the limit behavior of the solution to quasi-static Biot's equations in thin poroelastic flexural shells as the thickness of the shell tends to zero and extend the results obtained for the poroelastic plate by Marciniak-Czochra and Mikeli\\'c. We choose Terzaghi's time corresponding to the shell thickness and obtain the strong convergence of the three-dimensional solid displacement, fluid pressure and total poroelastic stress to the solution of the new class of shell equations. The derived bending equation is coupled with the pressure equation and it contains the bending moment due to the variation in pore pressure across the shell thickness. The effective pressure equation is parabolic only in the normal direction. As additional terms it contains the time derivative of the middle-surface flexural strain. Derivation of the model presents an extension of the results on the derivation of classical linear elastic shells by Ciarlet and collaborators to the poroelastic shells case. The n...
Synthesis of 8-Heteroaryl-2'-deoxyguanosine Derivatives.
Hobley, Gerard; Gubala, Vladimir; Rivera-Sánchez, María Del C; Rivera, José M
2008-06-01
We describe the synthesis of 8-heteroaromatic-2'-deoxyguanosine analogues using Suzuki-Miyaura or Stille conditions. Unprotected and protected 8-bromo-2'-deoxyguanosine was coupled with commercially available heteroarylboronic acids or the trialkyltin derivatives of 2-pyridylbromides either with or without microwave irradiation in good yields.
Synthesis of F-18 labeled raloxifene derivative
Energy Technology Data Exchange (ETDEWEB)
Lee, K. C.; Moon, B. S.; Jun, K. S. [KIRAMS, Seoul (Korea, Republic of); Lee, J. H.; Ji, D. Y. [Inha University, Incheon (Korea, Republic of)
2005-07-01
Raloxifene, [6-hydroxy-2-(4-hydroxy-phenyl) benzo [b] thiophen-3-yl]-[4-(2-piperidin-1-yl-ethoxy)phenyl] methanone, a tissue-selective estrogen mixed agonist/antagonist, classified as a selective estrogen receptor modulator (SERM), is currently under clinical evaluation for the prevention and treatment of postmenopausal osteoporosis, breast cancer, uterine dysfunction, and other disorders of the female reproductive system. Based on SAR studies of substituted raloxifenes, we synthesized 3 kinds of fluoroalkylated raloxifene derivatives. These compounds show high relative binding affinities (RBA) to the estrogen receptor in vitro (RBA of estradiol = 100%). The RBA values for compounds 1, 2 and 3 are 89, 60, and 45%, respectively, which are all higher than that of raloxifene itself (34%). Among these compounds, we selected to take the best RBA value one and F-18 labeled. Using 2 kinds of labeling method ; 1) Radiolabeling using [{sup 18}F]KF was carried out in anhydrous acetonitrile for 10 min at 120 .deg. C. 2) Radiolabeling using [{sup 18}F]KF was carried out in anhydrous acetonitrile for 15 min at 120 .deg. C in ionic liquid, [bmim][OTf]. Deprotection step added 1N HCl and reacted for 3 min at 120 .deg. C. [{sup 18}F]Fluoroethyl raloxifene derivative obtained 5-23% decay corrected labeling yield by HPLC system (C18 xterra, 10 i, 34% Acetonitrile/0.1 M formate buffer, flow rate: 4 mL/1 min, collection time : 28-29 min) and total time was around 70 min. Fluoroethyl raloxifene derivative has the best RBA value among the other synthesized derivatives and chose it for radiolabeling. [{sup 18}F]Fluoroethyl raloxifene derivative prepared 5-23% decay corrected labeling yield. This preparation is on going for labeling optimizing and preparing of in vitro and in vivo test.
Platelet derivatives in regenerative medicine: an update.
De Pascale, Maria Rosaria; Sommese, Linda; Casamassimi, Amelia; Napoli, Claudio
2015-01-01
Prior preclinical and clinical studies support the use of platelet-derived products for the treatment of soft and hard tissue lesions. These regenerative effects are controlled by autocrine and paracrine biomolecules including growth factors and cytokines contained in platelet alpha granules. Each growth factor is involved in a phase of the healing process, such as inflammation, collagen synthesis, tissue granulation, and angiogenesis collectively promoting tissue restitution. Platelet derivatives have been prepared as platelet-rich plasma, platelet gel, platelet-rich fibrin, and platelet eye drops. These products vary in their structure, growth factors, composition, and cytokine concentrations. Here, we review the current use of platelet-derived biological products focusing on the rationale for their use and the main requirements for their preparation. Variation in the apparent therapeutic efficacy may have resulted from a lack of reproducible, standardized protocols for preparation. Despite several individual studies showing favorable treatment effects, some randomized controlled trials as well as meta-analyses have found no constant clinical benefit from the application of platelet-derived products for prevention of tissue lesions. Recently, 3 published studies in dentistry showed an improvement in bone density. Seven published studies showed positive results in joint regeneration. Five published studies demonstrated an improvement in the wound healing, and an improvement of eye epithelial healing was observed in 2 reports. Currently, at least 14 ongoing clinical trials in phase 3 or 4 have been designed with large groups of treated patients (n > 100). Because the rationale of the therapy with platelet-derived compounds is still debated, a definitive insight can be acquired only when these large randomized trials will be completed.
Familial Follicular-Cell Derived Carcinoma
Directory of Open Access Journals (Sweden)
Eun Ju eSon
2012-05-01
Full Text Available Follicular cell-derived well-differentiated thyroid cancer, papillary (PTC and follicular thyroid carcinomas (FTC compose 95% of all thyroid malignancies. Familial follicular cell-derived well-differentiated thyroid cancers contribute to 5% of those cases. These familial follicular cell derived carcinomas or non-medullary thyroid carcinomas (NMTC divide into two clinical-pathological groups. One group, syndromic-associated, composed by predominately non-thyroidal tumors, is comprised of Pendred syndrome, Warner syndrome, Carney complex type 1, PTEN-hamartoma tumor syndrome (Cowden disease; PHTS, familial adenomatous polyposis (FAP/Gardner syndrome. Additionally other less established links correlated to the development of follicular cell-derived tumors have also included Ataxia-teleangiectasia syndrome, McCune Albright syndrome, and Peutz-Jeghers syndrome. The subsequent group encompasses syndromes typified by non-medullary thyroid carcinomas or NMTC, as well as, pure familial (f PTC with or without oxyphilia, fPTC with multinodular goiter and fPTC with papillary renal cell carcinoma. This heterogeneous group of diseases has not a established genotype-phenotype correlation as the well-known genetic events identified in the familial C-cell-derived tumors or medullary thyroid carcinomas (MTC. Clinicians should be have the knowledge to identify the likelihood of a patient presenting with thyroid cancer having an additional underlying familial syndrome stemming from characteristics through morphological findings that would alert the pathologist to have the patient undergo subsequent molecular genetics evaluations. This review will discuss the clinical and pathological findings of the patients with familial papillary thyroid carcinoma, such as familial adenomatous polyposis, Carney complex, Werner syndrome, and Pendred syndrome and the heterogeneous group of familial papillary thyroid carcinoma.
A New Grünwald-Letnikov Derivative Derived from a Second-Order Scheme
Directory of Open Access Journals (Sweden)
B. A. Jacobs
2015-01-01
Full Text Available A novel derivation of a second-order accurate Grünwald-Letnikov-type approximation to the fractional derivative of a function is presented. This scheme is shown to be second-order accurate under certain modifications to account for poor accuracy in approximating the asymptotic behavior near the lower limit of differentiation. Some example functions are chosen and numerical results are presented to illustrate the efficacy of this new method over some other popular choices for discretizing fractional derivatives.
Synthesis and electroluminescence properties of benzothiazole derivatives
Energy Technology Data Exchange (ETDEWEB)
Fu Huiying [Department of Materials Science, Fudan University, Shanghai 200433 (China); Gao Xindong [State Key Laboratory of Applied Surface Physics, Fudan University, Shanghai 200433 (China); Zhong Gaoyu; Zhong Zhiyang [Department of Materials Science, Fudan University, Shanghai 200433 (China); Xiao Fei, E-mail: feixiao@fudan.edu.c [Department of Materials Science, Fudan University, Shanghai 200433 (China); Shao Bingxian [Department of Materials Science, Fudan University, Shanghai 200433 (China)
2009-10-15
Benzothiazole-based blue fluorescent materials N-(4-(benzo[d]thiazol-2-yl)phenyl)-N-phenylbenzenamine (BPPA) and N-(4-(benzo[d]thiazol-2-yl)phenyl)-N-phenylnaphthalen-1-amine (BPNA) were synthesized for use in organic light-emitting diodes (OLEDs). Electroluminescent device with a configuration of ITO/NPB/BPPA/BCP/Alq{sub 3}/LiF/Al showed a maximum brightness of 3760 cd/m{sup 2} at 14.4 V with the CIE coordinates of (0.16, 0.16). A current efficiency of 3.01 cd/A and an external quantum efficiency of 2.37% at 20 mA/cm{sup 2} were obtained from this device. Molecules derived from BPPA and BPNA with incorporated dicyanomethylidene, which is a functional group for most red fluorescent molecules, were designed, synthesized and characterized to study the red fluorescence properties of the benzothiazole derivatives.
Benzodicarbomethoxytetrathiafulvalene derivatives as soluble organic semiconductors.
Otón, Francisco; Pfattner, Raphael; Oxtoby, Neil S; Mas-Torrent, Marta; Wurst, Klaus; Fontrodona, Xavier; Olivier, Yoann; Cornil, Jérôme; Veciana, Jaume; Rovira, Concepció
2011-01-07
A series of new tetrathiafulvalene (TTF) derivatives bearing dimethoxycarbonyl and phenyl or phthalimidyl groups fused to the TTF core (6 and 15-18) has been synthesized as potential soluble semiconductor materials for organic field-effect transistors (OFETs). The electron-withdrawing substituents lower the energy of the HOMO and LUMO levels and increase the solubility and stability of the semiconducting material. Crystal structures of all new TTF derivatives are also described, and theoretical DFT calculations were carried out to study the potential of the crystals to be used in OFET. In the experimental study, the best performing device exhibited a hole mobility up to 7.5 × 10(-3) cm(2) V(-1) s(-1)).
Renewable polyethylene mimics derived from castor oil.
Türünç, Oĝuz; Montero de Espinosa, Lucas; Meier, Michael A R
2011-09-01
An increasing number of reports on the syntheses of carbohydrate- and plant oil-based polymers has been published in ongoing efforts to produce plastic materials from renewable resources. Although many of these polymers are biodegradable and this is a desirable property for certain applications, in some cases non-degradable polymers are needed for long-term use purposes. Polyolefins are one of the most important classes of materials that have already taken their places in our daily life. On the other hand, their production relies on fossil resources. Therefore, within this contribution, we discuss synthetic routes toward a number of polyethylene mimics derived from fatty acids via thiol-ene and ADMET polymerization reactions in order to establish more sustainable routes toward this important class of polymers. Two different diene monomers were thus prepared from castor oil derived platform chemicals, their polymerization via the two mentioned routes was optimized and compared to each other, and their thermal properties were investigated.
The cytotoxic activity of ursolic acid derivatives.
Ma, Chao-Mei; Cai, Shao-Qing; Cui, Jing-Rong; Wang, Rui-Qing; Tu, Peng-Fei; Hattori, Masao; Daneshtalab, Mohsen
2005-06-01
Ursolic acid and 2alpha-hydroxyursolic acid isolated from apple peels were found to show growth inhibitory activity against four tumor cell lines, HL-60, BGC, Bel-7402 and Hela. Structural modifications were performed on the C-3, C-28 and C-11 positions of ursolic acid and the cytotoxicity of the derivatives was evaluated. The SAR revealed that the triterpenes possessing two hydrogen-bond forming groups (an H-donor and a carbonyl group) at positions 3 and 28 exhibit cytotoxic activity. The configuration at C-3 was found to be important for the activity. Introduction of an amino group increased the cytotoxicity greatly. A 3beta-amino derivative was 20 times more potent than the parent ursolic acid. The 28-aminoalkyl dimer compounds showed selective cytotoxicity.
Synthesis and biological evaluation of formazan derivatives.
Mariappan, Gurusamy; Korim, Rejaul; Joshi, Nand Madhwa; Alam, Faruk; Hazarika, Rajib; Kumar, Deepak; Uriah, Tiewlasubon
2010-10-01
The formazan derivatives (FM1-FM5) were synthesized by the reaction of benzaldehyde phenylhydrazone with substituted aromatic and hetero aromatic amines. The structures of the synthesized compounds were then elucidated using UV, IR, (1)H NMR and mass spectral data. The synthesized derivatives were screened for anticonvulsant, antibacterial and antiviral activities. All the compounds showed remarkable antibacterial activity at 250 μg/ml, but FM4 and FM3 did not show any inhibition on Staphylococcus aureus and Vibriocholera, respectively. All the compounds showed significant anticonvulsant effect at 100 mg/kg p.o. and the experimental data were statistically significant at P<0.001 level. But none of the compounds was effective against Japanese encephalitis virus.
Synthesis and biological evaluation of formazan derivatives
Directory of Open Access Journals (Sweden)
Gurusamy Mariappan
2010-01-01
Full Text Available The formazan derivatives (FM1-FM5 were synthesized by the reaction of benzaldehyde phenylhydrazone with substituted aromatic and hetero aromatic amines. The structures of the synthesized compounds were then elucidated using UV, IR, 1 H NMR and mass spectral data. The synthesized derivatives were screened for anticonvulsant, antibacterial and antiviral activities. All the compounds showed remarkable antibacterial activity at 250 μg/ml, but FM4 and FM3 did not show any inhibition on Staphylococcus aureus and Vibriocholera, respectively. All the compounds showed significant anticonvulsant effect at 100 mg/kg p.o. and the experimental data were statistically significant at P<0.001 level. But none of the compounds was effective against Japanese encephalitis virus.
Derivation of evolutionary payoffs from observable behavior
Feigel, Alexander; Engel, Assaf
2008-01-01
Interpretation of animal behavior, especially as cooperative or selfish, is a challenge for evolutionary theory. Strategy of a competition should follow from corresponding Darwinian payoffs for the available behavioral options. The payoffs and decision making processes, however, are difficult to observe and quantify. Here we present a general method for the derivation of evolutionary payoffs from observable statistics of interactions. The method is applied to combat of male bowl and doily spiders, to predator inspection by sticklebacks and to territorial defense by lions, demonstrating animal behavior as a new type of game theoretical equilibrium. Games animals play may be derived unequivocally from their observable behavior, the reconstruction, however, can be subjected to fundamental limitations due to our inability to observe all information exchange mechanisms (communication).
Carbon gels derived from natural resources
Directory of Open Access Journals (Sweden)
A. Celzard
2012-12-01
Full Text Available Most carbon gels investigated so far and reportedin the literature were prepared from resorcinolcrosslinked with formaldehyde in water, and weregenerally dried with supercritical CO2 before beingpyrolysed. In the present paper, through someselected examples, we show how valuable carbongels can be derived from other phenolic resourceshaving a natural origin. Special emphasis is givento tannin and lignin, both derived from wood, aspotential precursors of carbon aero- and cryogels.However, natural compounds not obeying the usualconcepts of sol-gel chemistry may also be used forpreparing carbon gels, such as cellulose, and evenglucose. In the latter case, hydrothermal treatmentforces the phase separation to occur, and leads tomonoliths which can be advantageously convertedinto carbon aerogels by supercritical drying andsubsequent pyrolysis.
Fundamentals and advanced techniques in derivatives hedging
Bouchard, Bruno
2016-01-01
This book covers the theory of derivatives pricing and hedging as well as techniques used in mathematical finance. The authors use a top-down approach, starting with fundamentals before moving to applications, and present theoretical developments alongside various exercises, providing many examples of practical interest. A large spectrum of concepts and mathematical tools that are usually found in separate monographs are presented here. In addition to the no-arbitrage theory in full generality, this book also explores models and practical hedging and pricing issues. Fundamentals and Advanced Techniques in Derivatives Hedging further introduces advanced methods in probability and analysis, including Malliavin calculus and the theory of viscosity solutions, as well as the recent theory of stochastic targets and its use in risk management, making it the first textbook covering this topic. Graduate students in applied mathematics with an understanding of probability theory and stochastic calculus will find this b...
Cosmology with higher-derivative matter fields
Harko, Tiberiu; Saridakis, Emmanuel N
2014-01-01
We investigate the cosmological implications of a new class of modified gravity, where the field equations generically include higher-order derivatives of the matter fields, arising from the introduction of non-dynamical auxiliary fields in the action. Imposing a flat, homogeneous and isotropic geometry we extract the Friedmann equations, obtaining an effective dark-energy sector containing higher derivatives of the matter energy density and pressure. For the cases of dust, radiation, and stiff matter we analyze the cosmological behavior, finding accelerating, de Sitter, and non-accelerating phases, dominated by matter or dark energy. Additionally, the effective dark-energy equation-of-state parameter can be quintessence-like, cosmological-constant-like, or even phantom-like. The detailed study of these scenarios may provide signatures that could distinguish them from other candidates of modified gravity.
Synthesis of metronidazole derivatives as antigiardiasis agents
Directory of Open Access Journals (Sweden)
Khabnadideh S.
2007-04-01
Full Text Available Metronidazole (MTZ and its derivatives have been extensively used to treat infections caused by protozoa and anaerobic bacteria. In this investigation several novel imidazole and nitroimidazol derivatives namely: 2-(1H-1-imidazolyl-1-phenyl-1-ethanol 1a, 2-(2-methyl-1H-1-imidazolyl-1-phenyl-1-ethanol 1b, 2-(2-methyl-4-nitro-1H-1-imidazolyl-1-phenyl-1-ethanol 1c, 2-(1H-1-imidazolyl-1-cyclohexanol 2d and 2-(2-methyl-4-nitro-1H-1-imidazolyl-1-cyclohexanol 2e were prepared by the reaction of the corresponding imidazoles with styrene oxide or cyclohexene oxide respectively and their biological activity against Giardia lamblia cyst in compareison with MTZ were determined by flotation technique based on Bingham method. These compounds were less active than metronidazole but showed significant antigiardiasis activity.
Inconsistency of Minkowski higher-derivative theories
Aglietti, Ugo G.; Anselmi, Damiano
2017-02-01
We show that Minkowski higher-derivative quantum field theories are generically inconsistent, because they generate nonlocal, non-hermitian ultraviolet divergences, which cannot be removed by means of standard renormalization procedures. By "Minkowski theories" we mean theories that are defined directly in Minkowski spacetime. The problems occur when the propagators have complex poles, so that the correlation functions cannot be obtained as the analytic continuations of their Euclidean versions. The usual power counting rules fail and are replaced by much weaker ones. Self-energies generate complex divergences proportional to inverse powers of D'Alembertians. Three-point functions give more involved nonlocal divergences, which couple to infrared effects. We illustrate the violations of the locality and hermiticity of counterterms in scalar models and higher-derivative gravity.
Electrochemical Behavior of Biologically Important Indole Derivatives
Directory of Open Access Journals (Sweden)
Cigdem Karaaslan
2011-01-01
Full Text Available Voltammetric techniques are most suitable to investigate the redox properties of a new drug. Use of electrochemistry is an important approach in drug discovery and research as well as quality control, drug stability, and determination of physiological activity. The indole nucleus is an essential element of a number of natural and synthetic products with significant biological activity. Indole derivatives are the well-known electroactive compounds that are readily oxidized at carbon-based electrodes, and thus analytical procedures, such as electrochemical detection and voltammetry, have been developed for the determination of biologically important indoles. This paper explains some of the relevant and recent achievements in the electrochemistry processes and parameters mainly related to biologically important indole derivatives in view of drug discovery and analysis.
Renminbi Derivatives: Recent Development and Issues
Institute of Scientific and Technical Information of China (English)
Wensheng Peng; Chang Shu; Raymond Yip
2007-01-01
This study reviews the developments in the onshore and offshore renminbi derivatives markets. The onshore market has seen a rapid build-up in the market infrastructure and price discovery mechanism in the past year, with empirical evidence suggesting that its pricing is increasingly determined by financial fundamentals, such as the covered interest rate parity. However, the growth of the market has been restrained by restrictions on the participant base, limited variations in the RMB/US$ exchange rate, market participants'lack of technical capacity and experience, and inadequate supporting financial market infrastructure. The non-deliverable forward (NDF) market, concentrated in Hong Kong and Singapore, is more developed, but has the drawback that its pricing is not tied to financial fundamentals. The comparison between onshore and offshore markets suggests that two issues are of particular importance for future derivatives market development in China: the balance between regulation and development, and the relationship between onshore and offshore markets.
Synthesis of β-Amino Acid Derivatives
Institute of Scientific and Technical Information of China (English)
Zhao Yonghua; Ma Zhihua; Jiang Nan; Wang Jianbo
2004-01-01
In recent years, β-amino acids and their derivatives have attracted considerable attention due to their occurrence in biologically active natural products, such as dolastatins,cyclohexylnorstatine and Taxol. β-Amino acids also find application in the synthesis of β-lactams,piperidines, indolizidines. Moreover, the peptides consisting of β-amino acids, the so-called β-peptides, have been extensively studied recently. Consequently, considerable efforts have been directed to the synthesis of β-amino acids and their derivatives1. In particular, stereoselective synthesis of β-amino acids has been a challenging project, and there are only limited methods available. In this presentation, we report our efforts in this area.
Perturbative unitarity of Higgs derivative interactions
Kikuta, Yohei
2012-01-01
We study the perturbative unitarity bound given by dimension six derivative interactions consisting of Higgs doublets. These operators emerge from kinetic terms of composite Higgs models or integrating out heavy particles that interact with Higgs doublets. They lead to new phenomena beyond the Standard Model. One of characteristic contributions by derivative interactions appear in vector boson scattering processes. Longitudinal modes of massive vector bosons can be regarded as Nambu Goldstone bosons eaten by each vector field with the equivalence theorem. Since their effects become larger and larger as the collision energy of vector bosons increases, vector boson scattering processes become important in a high energy region around the TeV scale. On the other hand, in such a high energy region, we have to take the unitarity of amplitudes into account. We have obtained the unitarity condition in terms of the parameter included in the effective Lagrangian for one Higgs doublet models. Applying it to some of mode...
Synthesis and bioactivity of novel phthalimide derivatives
Institute of Scientific and Technical Information of China (English)
Tao Wang; Yi Hua Zhang; Hui Ji; Yan Ping Chen; Si Xun Peng
2008-01-01
Novel phthalimide derivatives (4a, 4b and 6a-6e) were designed as hybrids of thalidomide and NO-ASA, and their chemicalsynthesis and in vitro biological activities were presented. The preliminary results showed that compared to thalidomide 4a and 4bexhibited enhanced activities against ECV304 and HepG2 cells, whereas 6c was more potent against HepG2 cells.
Oxidative rearrangements of tricyclic vinylcyclobutane derivatives
Grota, Juliane; Mattay, Jochen; Piech, Krzysztof; Bally, Thomas
2006-01-01
Three tricyclic vinylcyclobutanes (3-methylenetricyclo[5.3.0.02,6]decanes 1-3) have been subjected to ionization by photoinduced electron transfer in solution and by X-irradiation in Ar matrices. All three compounds undergo oxidative cycloreversion; the cleavage of the four-membered ring, however, occurs in a different direction depending on the presence of a methyl group in position 6 of the tricyclic framework. In those derivatives, cycloreversion is found to lead to 1-methyl-8-methylene-1,...
Aging and Rejuvenation with Fractional Derivatives
2007-11-02
Science, University of North Texas, P. O. Box 311427, Denton, Texas 76203-1427, USA 2Dipartimento di Fisica dell’Università di Pisa and INFM, via...interval 2,m,3, yield a generalized master equation equivalent to the sum of an ordinary Markov contribution and a fractional derivative term. We show...though these processes are associated with quite different physical phenomena [14]. His general argu- ments rested on three assumptions: (1) microscopic
Anthranilic acid derivatives from Inula japonica
Institute of Scientific and Technical Information of China (English)
Jiang Jiang Qin; Hui Zi Jin; Jian Jun Fu; Xiao Jia Hu; Yan Zhu; Yun Heng Shen; Shi Kai Yan; Wei Dong Zhang
2008-01-01
Three new anthranilic acid derivatives, N-heneicosanoylanthranilic acid (1b), N-tricosanoylanthranilic acid (1d), N-tetra-cosanoylanthranilic acid (1e), and two known N-arachidylanthranilic acid (1a) and N-docosanoylanthranilic acid (1c) were isolatedfrom the aerial parts of Inula japonica Thunb. Their structures were established by spectroscopic and chemical methods.2008 Hui Zi Jin. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Synthesis and biological evaluation of indazole derivatives.
Claramunt, Rosa M; López, Concepción; López, Ana; Pérez-Medina, Carlos; Pérez-Torralba, Marta; Alkorta, Ibon; Elguero, José; Escames, Germaine; Acuña-Castroviejo, Darío
2011-04-01
The inhibition of neuronal and inducible nitric oxide synthases (nNOS and iNOS) by a series of 36 indazoles has been evaluated, showing that most of the assayed derivatives are better iNOS than nNOS inhibitors. A parabolic model relating the iNOS inhibition percentage with the difference, E(rel), between stacking and apical interaction energies of indazoles with the active site of the NOS enzyme has been established.
Derived length for arbitrary topological spaces
Directory of Open Access Journals (Sweden)
A. J. Jayanthan
1992-01-01
Full Text Available The notion of derived length is as old as that of ordinal numbers itself. It is also known as the Cantor-Bendixon length. It is defined only for dispersed (that is scattered spaces. In this paper this notion has been extended in a natural way for all topological spaces such that all its pleasing properties are retained. In this process we solve a problem posed by V. Kannan. ([1] Page 158.
Eisenhart lift for higher derivative systems
Galajinsky, Anton
2016-01-01
The Eisenhart lift provides an elegant geometric description of a dynamical system of second order in terms of null geodesics of the Brinkmann-type metric. In this work, we attempt to generalize the Eisenhart method so as to encompass higher derivative models. The analysis relies upon Ostrogradsky's Hamiltonian. A consistent geometric description seems feasible only for a particular class of potentials. The scheme is exemplified by the Pais-Uhlenbeck oscillator.
On Butterfly effect in Higher Derivative Gravities
Alishahiha, Mohsen; Naseh, Ali; Taghavi, Seyed Farid
2016-01-01
We study butterfly effect in $D$-dimensional gravitational theories containing terms quadratic in Ricci scalar and Ricci tensor. One observes that due to higher order derivatives in the corresponding equations of motion there are two butterfly velocities. The velocities are determined by the dimension of operators whose sources are provided by the metric. The three dimensional TMG model is also studied where we get two butterfly velocities at generic point of the moduli space of parameters. At critical point two velocities coincide.
A Facile Synthesis of Pyrrolidine Derivatives
Institute of Scientific and Technical Information of China (English)
SHAO Zhi-Hui; CHEN Jing-Bo; WANG Cheng-Ying; LIU Xiao-Long; REN Zhou-Yang; TU Yong-Qiang; ZHANG Hong-Bin
2003-01-01
@@ The Amaryllidaceae alkaloids have attracted considerable attention for their interesting biological activities. [1] Many of these tyrosine derived alkaloids[2] incorporate a hexahydroindole moiety in the structural skeletons. New approaches towards the synthesis of hexahydroindole core have been a topical interest for the synthetic community.Herein we report an experimentally very simple method for the synthesis of hexahydroindole by aminocylization. Four kinds of N-substituted have been demonstrate to be effective to this cyclization. The results were summarized in Figure 1.
Eosinophil secretion of granule-derived cytokines
Directory of Open Access Journals (Sweden)
Lisa A Spencer
2014-10-01
Full Text Available Eosinophils are tissue-dwelling leukocytes, present in the thymus, and gastrointestinal and genitourinary tracts of healthy individuals at baseline, and recruited, often in large numbers, to allergic inflammatory foci and sites of active tissue repair. The biological significance of eosinophils is vast and varied. In health, eosinophils support uterine and mammary gland development, and maintain bone marrow plasma cells and adipose tissue alternatively activated macrophages, while in response to tissue insult eosinophils function as inflammatory effector cells, and, in the wake of an inflammatory response, promote tissue regeneration and wound healing. One common mechanism driving many of the diverse eosinophil functions is the regulated and differential secretion of a vast array of eosinophil-derived cytokines. Eosinophils are distinguished from most other leukocytes in that many, if not all, of the over three dozen eosinophil-derived cytokines are pre-synthesized and stored within intracellular granules, poised for very rapid, stimulus-induced secretion. Eosinophils engaged in cytokine secretion in situ utilize distinct pathways of cytokine release that include: classical exocytosis, whereby granules themselves fuse with the plasma membrane and release their entire contents extracellularly; piecemeal degranulation, whereby granule-derived cytokines are selectively mobilized into vesicles that emerge from granules, traverse the cytoplasm and fuse with the plasma membrane to release discrete packets of cytokines; and eosinophil cytolysis, whereby intact granules are extruded from eosinophils, and deposited within tissues. In this latter scenario, extracellular granules can themselves function as stimulus-responsive secretory-competent organelles within the tissue. Here we review the distinctive processes of differential secretion of eosinophil granule-derived cytokines.
Higher derivative super Yang-Mills theories
Bergshoeff, E.; Rakowski, M.; Sezgin, E.
1987-01-01
The most general higher derivative Yang-Mills actions of the type (F^2 + Î±^2F^4) which are globally supersymmetric up to order Î±^2 in six- and ten-dimensional spacetimes are given. The F^4-terms turn out to occur in the combination Î±^2[tr F^4 - Â¼(tr F^2)^2], where the trace is over the Lorentz i
Aminopyrimidine derivatives as adenosine antagonists / Janke Kleynhans
Kleynhans, Janke
2013-01-01
Aims of this project - The aim of this study was to design and synthesise novel 2-aminopyrimidine derivatives as potential adenosine A1 and A2A receptor antagonists. Background and rationale - Parkinson’s disease is the second most common neurodegenerative disorder (after Alzheimer’s disease) and is characterised by the selective death of the dopaminergic neurons of the nigro-striatal pathway. Distinctive motor symptoms include bradykinesia, muscle rigidity and tremor, while non-m...
Einstein solvmanifolds with a simple Einstein derivation
Nikolayevsky, Y.
2007-01-01
The structure of a solvable Lie groups admitting an Einstein left-invariant metric is, in a sense, completely determined by the nilradical of its Lie algebra. We give an easy-to-check necessary and sufficient condition for a nilpotent algebra to be an Einstein nilradical whose Einstein derivation has simple eigenvalues. As an application, we classify filiform Einstein nilradicals (modulo known classification results on filiform graded Lie algebras).
Nile Blue derivatives as lysosomotropic photosensitizers
Lin, Chi-Wei; Shulok, Janine R.; Kirley, S. D.; Cincotta, Louis; Foley, James W.
1991-06-01
The benzophenoxazines, including several Nile blue analogues, are a unique group of dyes that localize selectively in animal tumors. Chemical modifications of Nile blue A can yield derivatives with high 1O2 quantum yields. These derivatives represent a group of potentially effective photosensitizers for selective phototherapy of malignant tumors. In vitro evaluation of these derivatives has indicated that those with high 1O2 yields are very effective in mediating the photocytotoxicity of tumor cells. This photodynamic effect is most likely mediated through the action of 1O2, since photoirradiation under D2O enhanced and under hypoxic conditions diminished the photocytotoxic action. The subcellular localization of these photosensitizers in bladder tumor cells in culture was examined by light and fluorescence microscopies as well as by histochemical and biochemical studies. The results indicate that these dyes are localized primarily in the lysosome. The cellular uptake and retention of these dyes is energy- and pH-dependent. Agents such as nigericin, which alter the transmembrane pH gradient, reduced uptake and enhanced efflux of the dyes, while agents such as valinomycin, which reduce cellular membrane potential, had no effect on the uptake. These findings are consistent with having ion-trapping as the mechanism for the uptake of these dyes. Photoirradiation of sensitizer-treated cells obliterated lysosomes in a light-dose and drug-dose dependent fashion. Release of the hydrolytic enzymes may be the main cause for subsequent cell death since the cytolytic effect was reduced by a specific inhibitor of lysosomal proteolytic enzyme. A lysosomotropic photosensitization mechanism is therefore proposed for the photocytotoxic action of the Nile blue derivatives. This mechanism may provide an approach to the development of new photosensitizers for the effective and selective destruction of malignant tumors.
Particle production in higher derivative theory
Indian Academy of Sciences (India)
G P Singh; A Beesham; R V Deshpande
2000-05-01
The effect of particle production on the evolution of the spatially ﬂat Friedmann–Lemaitre–Robertson–Walker cosmological model during the early stages of the universe is analysed in the framework of higher derivative theory. The universe has been considered as an open thermodynamic system where particle production gives rise to a supplementary negative creation pressure in addition to the thermodynamic pressure. The dynamical behaviour of both exponential as well as power law solutions have been discussed.
TD-DFT Study on Pyrazoline Derivatives
Institute of Scientific and Technical Information of China (English)
无
2005-01-01
The molecular structures of ground state and first single excited state for pyrazoline derivatives are optimized with DFT B3LYP method and ab initio "configuration interaction with single excitations"(CIS) method, respectively. The frontier molecular orbital characteristics have been analyzed systematically, and the electronic transition mechanism has been discussed. Electronic spectra are calculated by using TD-DFT method. These results are consistent with those from the experiment.
Time-delay and fractional derivatives
Tenreiro Machado JA
2011-01-01
This paper proposes the calculation of fractional algorithms based on time-delay systems. The study starts by analyzing the memory properties of fractional operators and their relation with time delay. Based on the Fourier analysis an approximation of fractional derivatives through time-delayed samples is developed. Furthermore, the parameters of the proposed approximation are estimated by means of genetic algorithms. The results demonstrate the feasibility of the new perspective.
Two Unusual Flavanol Derivatives from Brainea insignis
Institute of Scientific and Technical Information of China (English)
杨明惠; 蔡乐; 沈晓静; 赵冕; 尹田鹏; 丁中涛
2012-01-01
Two new flavanol derivatives, bearing phenylpropionic acid moiety at C-4 through a C--C bonding, named brainin B （1） and brainin C （2）, were isolated from Brainea insignis. Their structures were elucidated by NMR and MS spectrometry, Brainins B and C were tested for their antioxidant properties in DPPH （2,2-diphenyl-l-picryl- hydrazyl） radical scavenging, and both compounds displayed potent antioxidant activities.
Literature Review of Polymer Derived Ceramics
Energy Technology Data Exchange (ETDEWEB)
Peterson, Reuben James [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2016-05-25
Polymer Derived Ceramics (PDCs), also known as preceramic polymers, are valuable coating agents that are used to produce surface barriers on substrates such as stainless steel. These barriers protect against a multitude of environmental threats, and have been used since their research and development in 19772. This paper seeks to review and demonstrate the remarkable properties and versatility that PDCs have to offer, while also giving a brief overview of the processing techniques used today.
Measurements of brain-derived neurotrophic factor
DEFF Research Database (Denmark)
Trajkovska, Viktorija; Klein, Anders Bue; Vinberg, Maj;
2007-01-01
Although numerous studies have dealt with changes in blood brain-derived neurotrophic factor (BDNF), methodological issues about BDNF measurements have only been incompletely resolved. We validated BDNF ELISA with respect to accuracy, reproducibility and the effect of storage and repeated freezing...... reproducibility. Female gender is associated with higher whole blood BDNF concentrations whereas age, thrombocyte count and BDNF Val66Met polymorphism were un-associated....
Photopolymerization induced by a benzophenone derivative photoinitiator
Institute of Scientific and Technical Information of China (English)
无
2007-01-01
A benzophenone derivative photoinitiator, HBP-TDI-HQ-TDI-HBP (HTCTH), was synthesized based on 4-hydroxy benzophenone (HBP), toluene-2,4-diisocyanate (TDI) and hydroquinone (HQ). HTCTH was a more effective photoinitiator which had longer wavelength absorption in the UV-vis absorption spectra than the low molecular counterpart benzophenone (BP). It showed that both rate of polymerization (Rp) and final conversion (P) increased with increase of amine and HTCTH concentration in photopolymerization.
Synthesis of new 2-quinazolylacetonitrile derivatives
Energy Technology Data Exchange (ETDEWEB)
Kim, Jung Hwan; Min, Kyung Su [Yeungnam Univ., Gyongsan (Korea, Republic of)
2001-12-01
2-Quinazolylacetonitrile derivatives containing H-chelate have been synthesized from 2-cyanomethylquinazoline using electrophiles such as 4-chloroquinazoline, 4-chloro-2-phenylquinazoline, 4,6-dichloropyrimidine, 4,6-dichloro-2-phenylpyrimidine, 4,6-dichloro-5-phenylpyrimidine, 2-chloroquinoxaline, 1,3-dichloroisoquinoline, 2,6-dichloropyrazine and 4,6-dichloro-2,5-diphenylpyrimidine. These H-chelates may serve as a polymethine chromophore system. Structures of the target molecules were identified by spectral methods.
A new bibenzyl derivative from Pleione bulbocodioides
Institute of Scientific and Technical Information of China (English)
Xin Qiao Liu; Qiao Yu Yuan; Yuan Qiang Guo
2008-01-01
A new bibenzyl derivative 1, named 2-(4"-hydrixybenzyl)-3-(3'-hydroxyphenethyl)-5-methoxy-cyclohexa-2,5-diene-1,4-dione, and two known stilbenoids (2, 3) were isolated from the tubers of Pleione bulbocodioides (Franch.) Rolfe. Their structureswere elucidated by spectroscopic methods.2008 Xin Qiao Liu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
The Synthesis of 6-Alkyl-5-Fluorouracil Derivatives
Institute of Scientific and Technical Information of China (English)
无
2000-01-01
6-alkyl-5-fluorouracil derivatives (5a～5f) were synthesized by facile alkylation of lithiation of 5-fluorouracil derivatives with mthyl iodide (MeI) or alkyl trifluoromethanesulfonate (ROTf) in yield of 42～58%. We found that the methylated product was ethyl-substituted derivatives, not methyl-substituted derivatives.
On Functional Inequalities Originating from Module Jordan Left Derivations
Directory of Open Access Journals (Sweden)
Ick-Soon Chang
2008-06-01
Full Text Available We first examine the generalized Hyers-Ulam stability of functional inequality associated with module Jordan left derivation (resp., module Jordan derivation. Secondly, we study the functional inequality with linear Jordan left derivation (resp., linear Jordan derivation mapping into the Jacobson radical.
14 CFR 1203.500 - Use of derivative classification.
2010-01-01
... 14 Aeronautics and Space 5 2010-01-01 2010-01-01 false Use of derivative classification. 1203.500... PROGRAM Derivative Classification § 1203.500 Use of derivative classification. The application of derivative classification markings is a responsibility of those who incorporate, paraphrase, restate,...
On Functional Inequalities Originating from Module Jordan Left Derivations
Directory of Open Access Journals (Sweden)
Kang Sheon-Young
2008-01-01
Full Text Available Abstract We first examine the generalized Hyers-Ulam stability of functional inequality associated with module Jordan left derivation (resp., module Jordan derivation. Secondly, we study the functional inequality with linear Jordan left derivation (resp., linear Jordan derivation mapping into the Jacobson radical.
On Functional Inequalities Originating from Module Jordan Left Derivations
Kang Sheon-Young; Chang Ick-Soon; Kim Hark-Mahn
2008-01-01
Abstract We first examine the generalized Hyers-Ulam stability of functional inequality associated with module Jordan left derivation (resp., module Jordan derivation). Secondly, we study the functional inequality with linear Jordan left derivation (resp., linear Jordan derivation) mapping into the Jacobson radical.
77 FR 7028 - Changes To Implement Derivation Proceedings
2012-02-10
... Patent and Trademark Office 37 CFR Part 42 RIN 0651-AC74 Changes To Implement Derivation Proceedings... the provisions of the Leahy- Smith America Invents Act that create a new derivation proceeding to be... administrative proceeding called a derivation proceeding. Derivation proceedings were created to ensure that...
EVALUATION OF ANTIOXIDANT POTENTIAL OF PYRAZOLONE DERIVATIVES
Directory of Open Access Journals (Sweden)
G. Mariappan
2010-06-01
Full Text Available In this article the antioxidant property of pyrazolones derivatives (PYZ1 to PYZ10 are reported. It was assessed by estimation of Malonaldehyde (MDA and 4-Hydroxyl-2-noneal (4-HNE as lipid peroxidation markers in myocardial ischemic reperfusion injury. The inhibition of lipid peroxidation was compared with the standard ascorbic acid. Among synthesized derivatives PYZ2, PYZ3, PYZ7, PYZ8, PYZ9, and PYZ10 were found to have potent antioxidant effect against MDA marker. In case of 4-HNE, PYZ4, PYZ5, PYZ6, PYZ7, PYZ8, PYZ9 and PYZ10 were found to have effective antioxidant activity and the rest of the compounds are moderately active. Comparatively PYZ7, PYZ8, PYZ9 and PYZ10 are having effective role to control both MDA and 4-HNE generation. All the experimental data were statistically significant at p<0.05 level. Interestingly, beyond its NSAID property, this study explores the protective role of pyrazolone derivatives in ischemic heart injury.
Healthy degenerate theories with higher derivatives
Energy Technology Data Exchange (ETDEWEB)
Motohashi, Hayato [Kavli Institute for Cosmological Physics, The University of Chicago,Chicago, Illinois 60637 (United States); Noui, Karim [Laboratoire de Mathématiques et Physique Théorique,Université François Rabelais,Parc de Grandmont, 37200 Tours (France); Laboratoire APC - Astroparticule et Cosmologie,Université Paris Diderot Paris 7,75013 Paris (France); Suyama, Teruaki [Research Center for the Early Universe (RESCEU), Graduate School of Science,The University of Tokyo, Tokyo 113-0033 (Japan); Yamaguchi, Masahide [Department of Physics, Tokyo Institute of Technology,2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan); Langlois, David [Laboratoire APC - Astroparticule et Cosmologie,Université Paris Diderot Paris 7,75013 Paris (France)
2016-07-20
In the context of classical mechanics, we study the conditions under which higher-order derivative theories can evade the so-called Ostrogradsky instability. More precisely, we consider general Lagrangians with second order time derivatives, of the form L(ϕ{sup ¨a}, ϕ-dot {sup a},ϕ{sup a}; q-dot {sup i},q{sup i}) with a=1,⋯,n and i=1,⋯,m. For n=1, assuming that the q{sup i}’s form a nondegenerate subsystem, we confirm that the degeneracy of the kinetic matrix eliminates the Ostrogradsky instability. The degeneracy implies, in the Hamiltonian formulation of the theory, the existence of a primary constraint, which generates a secondary constraint, thus eliminating the Ostrogradsky ghost. For n>1, we show that, in addition to the degeneracy of the kinetic matrix, one needs to impose extra conditions to ensure the presence of a sufficient number of secondary constraints that can eliminate all the Ostrogradsky ghosts. When these conditions that ensure the disappearance of the Ostrogradsky instability are satisfied, we show that the Euler-Lagrange equations, which involve a priori higher order derivatives, can be reduced to a second order system.
Forest Area Derivation from SENTINEL-1 Data
Dostálová, Alena; Hollaus, Markus; Milenković, Milutin; Wagner, Wolfgang
2016-06-01
The recently launched Sentinel-1A provides the high resolution Synthetic Aperture Radar (SAR) data with very high temporal coverage over large parts of European continent. Short revisit time and dual polarization availability supports its usability for forestry applications. The following study presents an analysis of the potential of the multi-temporal dual-polarization Sentinel-1A data for the forest area derivation using the standard methods based on Otsu thresholding and K-means clustering. Sentinel-1 data collected in winter season 2014-2015 over a test area in eastern Austria were used to derive forest area mask with spatial resolution of 10m and minimum mapping unit of 500 m2. The validation with reference forest mask derived from airborne full-waveform laser scanning data revealed overall accuracy of 92 % and kappa statistics of 0.81. Even better results can be achieved when using external mask for urban areas, which might be misclassified as forests when using the introduced approach based on SAR data only. The Sentinel-1 data and the described methods are well suited for forest change detection between consecutive years.
Exosomes Derived from Mesenchymal Stem Cells
Directory of Open Access Journals (Sweden)
Bo Yu
2014-03-01
Full Text Available The functional mechanisms of mesenchymal stem cells (MSCs have become a research focus in recent years. Accumulating evidence supports the notion that MSCs act in a paracrine manner. Therefore, the biological factors in conditioned medium, including exosomes and soluble factors, derived from MSC cultures are being explored extensively. The results from most investigations show that MSC-conditioned medium or its components mediate some biological functions of MSCs. Several studies have reported that MSC-derived exosomes have functions similar to those of MSCs, such as repairing tissue damage, suppressing inflammatory responses, and modulating the immune system. However, the mechanisms are still not fully understood and the results remain controversial. Compared with cells, exosomes are more stable and reservable, have no risk of aneuploidy, a lower possibility of immune rejection following in vivo allogeneic administration, and may provide an alternative therapy for various diseases. In this review, we summarize the properties and biological functions of MSC-derived exosomes and discuss the related mechanisms.
FOREST AREA DERIVATION FROM SENTINEL-1 DATA
Directory of Open Access Journals (Sweden)
A. Dostálová
2016-06-01
Full Text Available The recently launched Sentinel-1A provides the high resolution Synthetic Aperture Radar (SAR data with very high temporal coverage over large parts of European continent. Short revisit time and dual polarization availability supports its usability for forestry applications. The following study presents an analysis of the potential of the multi-temporal dual-polarization Sentinel-1A data for the forest area derivation using the standard methods based on Otsu thresholding and K-means clustering. Sentinel-1 data collected in winter season 2014-2015 over a test area in eastern Austria were used to derive forest area mask with spatial resolution of 10m and minimum mapping unit of 500 m2. The validation with reference forest mask derived from airborne full-waveform laser scanning data revealed overall accuracy of 92 % and kappa statistics of 0.81. Even better results can be achieved when using external mask for urban areas, which might be misclassified as forests when using the introduced approach based on SAR data only. The Sentinel-1 data and the described methods are well suited for forest change detection between consecutive years.
Derivation of naive human embryonic stem cells.
Ware, Carol B; Nelson, Angelique M; Mecham, Brigham; Hesson, Jennifer; Zhou, Wenyu; Jonlin, Erica C; Jimenez-Caliani, Antonio J; Deng, Xinxian; Cavanaugh, Christopher; Cook, Savannah; Tesar, Paul J; Okada, Jeffrey; Margaretha, Lilyana; Sperber, Henrik; Choi, Michael; Blau, C Anthony; Treuting, Piper M; Hawkins, R David; Cirulli, Vincenzo; Ruohola-Baker, Hannele
2014-03-25
The naïve pluripotent state has been shown in mice to lead to broad and more robust developmental potential relative to primed mouse epiblast cells. The human naïve ES cell state has eluded derivation without the use of transgenes, and forced expression of OCT4, KLF4, and KLF2 allows maintenance of human cells in a naïve state [Hanna J, et al. (2010) Proc Natl Acad Sci USA 107(20):9222-9227]. We describe two routes to generate nontransgenic naïve human ES cells (hESCs). The first is by reverse toggling of preexisting primed hESC lines by preculture in the histone deacetylase inhibitors butyrate and suberoylanilide hydroxamic acid, followed by culture in MEK/ERK and GSK3 inhibitors (2i) with FGF2. The second route is by direct derivation from a human embryo in 2i with FGF2. We show that human naïve cells meet mouse criteria for the naïve state by growth characteristics, antibody labeling profile, gene expression, X-inactivation profile, mitochondrial morphology, microRNA profile and development in the context of teratomas. hESCs can exist in a naïve state without the need for transgenes. Direct derivation is an elusive, but attainable, process, leading to cells at the earliest stage of in vitro pluripotency described for humans. Reverse toggling of primed cells to naïve is efficient and reproducible.
Naturally Occurring Cinnamic Acid Sugar Ester Derivatives
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Yuxin Tian
2016-10-01
Full Text Available Cinnamic acid sugar ester derivatives (CASEDs are a class of natural product with one or several phenylacrylic moieties linked with the non-anomeric carbon of a glycosyl skeleton part through ester bonds. Their notable anti-depressant and brains protective activities have made them a topic of great interest over the past several decades. In particular the compound 3′,6-disinapoylsucrose, the index component of Yuanzhi (a well-known Traditional Chinese Medicine or TCM, presents antidepressant effects at a molecular level, and has become a hotspot of research on new lead drug compounds. Several other similar cinnamic acid sugar ester derivatives are reported in traditional medicine as compounds to calm the nerves and display anti-depression and neuroprotective activity. Interestingly, more than one third of CASEDs are distributed in the family Polygalaceae. This overview discusses the isolation of cinnamic acid sugar ester derivatives from plants, together with a systematic discussion of their distribution, chemical structures and properties and pharmacological activities, with the hope of providing references for natural product researchers and draw attention to these interesting compounds.
Healthy degenerate theories with higher derivatives
Motohashi, Hayato; Noui, Karim; Suyama, Teruaki; Yamaguchi, Masahide; Langlois, David
2016-07-01
In the context of classical mechanics, we study the conditions under which higher-order derivative theories can evade the so-called Ostrogradsky instability. More precisely, we consider general Lagrangians with second order time derivatives, of the form L(̈phia, dot phia, phia; qi, qi) with a = 1,⋯,n and i = 1,⋯,m. For n = 1, assuming that the qi's form a nondegenerate subsystem, we confirm that the degeneracy of the kinetic matrix eliminates the Ostrogradsky instability. The degeneracy implies, in the Hamiltonian formulation of the theory, the existence of a primary constraint, which generates a secondary constraint, thus eliminating the Ostrogradsky ghost. For n > 1, we show that, in addition to the degeneracy of the kinetic matrix, one needs to impose extra conditions to ensure the presence of a sufficient number of secondary constraints that can eliminate all the Ostrogradsky ghosts. When these conditions that ensure the disappearance of the Ostrogradsky instability are satisfied, we show that the Euler-Lagrange equations, which involve a priori higher order derivatives, can be reduced to a second order system.
P-Splines Using Derivative Information
Calderon, Christopher P.
2010-01-01
Time series associated with single-molecule experiments and/or simulations contain a wealth of multiscale information about complex biomolecular systems. We demonstrate how a collection of Penalized-splines (P-splines) can be useful in quantitatively summarizing such data. In this work, functions estimated using P-splines are associated with stochastic differential equations (SDEs). It is shown how quantities estimated in a single SDE summarize fast-scale phenomena, whereas variation between curves associated with different SDEs partially reflects noise induced by motion evolving on a slower time scale. P-splines assist in "semiparametrically" estimating nonlinear SDEs in situations where a time-dependent external force is applied to a single-molecule system. The P-splines introduced simultaneously use function and derivative scatterplot information to refine curve estimates. We refer to the approach as the PuDI (P-splines using Derivative Information) method. It is shown how generalized least squares ideas fit seamlessly into the PuDI method. Applications demonstrating how utilizing uncertainty information/approximations along with generalized least squares techniques improve PuDI fits are presented. Although the primary application here is in estimating nonlinear SDEs, the PuDI method is applicable to situations where both unbiased function and derivative estimates are available.
Affinity of guanosine derivatives for polycytidylate revisited
Kanavarioti, A.; Hurley, T. B.; Baird, E. E.
1995-01-01
Evidence is presented for complexation of guanosine 5'-monophosphate 2-methylimidazolide (2-MeImpG) with polycytidylate (poly(C)) at pH 8.0 and 23 degrees C in the presence of 1.0 M NaCl2 and 0.2 M MgCl2 in water. The association of 2-MeImpG with poly(C) was investigated using UV-vis spectroscopy as well as by monitoring the kinetics of the nucleophilic substitution reaction of the imidazole moiety by amines. The results of both methods are consistent with moderately strong poly(C) 2-MeImpG complexation and the spectrophotometric measurements allowed the construction of a binding isotherm with a concentration of 2-MeImpG equal to 5.55 +/- 0.15 mM at half occupancy. UV spectroscopy was employed to establish the binding of other guanosine derivatives on poly(C). These derivatives are guanosine 5'-monophosphate (5'GMP), guanosine 5'-monophosphate imidazolide (ImpG), and guanosine 5'-monophosphate morpholidate (morpG). Within experimental error these guanosine derivatives exhibit the same affinity for poly(C) as 2-MeImpG.
Peano on derivative of measures, strict derivative of distributive set functions
Greco, Gabriele H; Pagani, Enrico M
2010-01-01
By retracing research on coexistent magnitudes (grandeurs coexistantes) by Cauchy (1841), Peano in "Applicazioni geometriche del calcolo infinitesimale" (1887) defines the "density" (strict derivative) of a "mass" (a distributive set function) with respect to a "volume" (a positive distributive set function), proves its continuity (whenever the strict derivative exists) and shows the validity of the mass-density paradigm: "mass" is recovered from "density" by integration with respect to "volume". It is remarkable that Peano's strict derivative provides a consistent mathematical ground to the concept of "infinitesimal ratio" between two magnitudes, successfully used since Kepler. In this way the classical (i.e., pre-Lebesgue) measure theory reaches a complete and definitive form in Peano's Applicazioni geometriche. A primary aim of the present paper is a detailed exposition of Peano's work of 1887 leading to the concept of strict derivative of distributive set functions and their use. Moreover, we compare Pean...
Local and 2-Local derivations on noncommutative Arens algebras
Ayupov, Sh A; Nurjanov, B O; Alauatdinov, A K
2011-01-01
The paper is devoted to so-called local and 2-local derivations on the noncommutative Arens algebra $L^\\omega(M, \\tau)$ associated with a von Neumann algebra $M$ and a faithful normal semi-finite trace $\\tau.$ We prove that every 2-local derivation on $L^\\omega(M, \\tau)$ is a spatial derivation, and if $M$ is a finite von Neumann algebra, then each local derivation on $L^\\omega(M, \\tau)$ is also a spatial derivation and every 2-local derivation on $M$ is in fact an inner derivation.
Biologic rhythms derived from Siberian mammoths' hairs.
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Mike Spilde
Full Text Available Hair is preserved for millennia in permafrost; it enshrines a record of biologic rhythms and offers a glimpse at chronobiology as it was in extinct animals. Here we compare biologic rhythms gleaned from mammoth's hairs with those of modern human hair. Four mammoths' hairs came from varying locations in Siberia 4600 km, four time zones, apart ranging in age between 18,000 and 20,000 years before present. We used two contemporaneous human hairs for comparison. Power spectra derived from hydrogen isotope ratios along the length of the hairs gave insight into biologic rhythms, which were different in the mammoths depending on location and differed from humans. Hair growth for mammoths was ∼31 cms/year and ∼16 cms/year for humans. Recurrent annual rhythms of slow and fast growth varying from 3.4 weeks/cycles to 8.7 weeks/cycles for slow periods and 1.2 weeks/cycles to 2.2 weeks/cycles for fast periods were identified in mammoth's hairs. The mineral content of mammoth's hairs was measured by electron microprobe analysis (k-ratios, which showed no differences in sulfur amongst the mammoth hairs but significantly more iron then in human hair. The fractal nature of the data derived from the hairs became evident in Mandelbrot sets derived from hydrogen isotope ratios, mineral content and geographic location. Confocal microscopy and scanning electron microscopy showed varied degrees of preservation of the cuticle largely independent of age but not location of the specimens. X-ray fluorescence microprobe and fluorescence computed micro-tomography analyses allowed evaluation of metal distribution and visualization of hollow tubes in the mammoth's hairs. Seasonal variations in iron and copper content combined with spectral analyses gave insights into variation in food intake of the animals. Biologic rhythms gleaned from power spectral plots obtained by modern methods revealed life style and behavior of extinct mega-fauna.
Stemness is derived from thyroid cancer cells
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Risheng eMa
2014-07-01
Full Text Available Background: One hypothesis for thyroid cancer development is its derivation from thyroid cancer stem cells (CSCs. Such cells could arise via different paths including from mutated resident stem cells within the thyroid gland or via epithelial to mesenchymal transition (EMT from malignant cells since EMT is known to confer stem-like characteristics. Methods: To examine the status of stemness in thyroid papillary cancer we employed a murine model of thyroid papillary carcinoma and examined the expression of stemness and EMT using qPCR and histochemistry in mice with a thyroid-specific knock-in of oncogenic Braf (LSL-Braf(V600E/TPO-Cre. This construct is only activated at the time of thyroid peroxidase (TPO expression in differentiating thyroid cells and cannot be activated by undifferentiated stem cells which do not express TPO.Results: There was decreased expression of thyroid specific genes such as Tg and NIS and increased expression of stemness markers such as Oct4, Rex1, CD15 and Sox2 in the thyroid carcinoma tissue from 6 week old BRAFV600E mice. The decreased expression of the epithelial marker E-cadherin and increased EMT regulators including Snail, Slug, and TGF-β1 and TGF-β3, and the mesenchymal marker vimentin demonstrated the simultaneous progression of EMT and the CSC-like phenotype. Stemness was also found in a derived cancer thyroid cell line in which overexpression of Snail caused up-regulation of vimentin expression and up regulation of stemness markers Oct4, Rex1, CD15 with enhanced migration ability of the cells. Conclusions: Our findings support our earlier hypothesis that stemness in thyroid cancer is derived via EMT rather than from resident thyroid stem cells. In mice with a thyroid-specific knock-in of oncogenic Braf (LSL-Braf(V600E/TPO-Cre the neoplastic changes were dependent on thyroid cell differentiation and the onset of stemness must have been derived from differentiated thyroid epithelial cells.
Properties of frequentist confidence levels derivatives
Martínez, Miriam Lucio; Dettori, Francesco
2016-01-01
In high energy physics, results from searches for new particles or rare processes are often reported using a modified frequentist approach, known as $\\rm{CL_s}$ method. In this paper, we study the properties of the derivatives of $\\rm{CL_s}$ and $\\rm{CL_{s+b}}$ as signal strength estimators if the confidence levels are interpreted as credible intervals. Our approach allows obtaining best fit points and $\\chi^2$ functions which can be used for phenomenology studies. In addition, this approach can be used to incorporate $\\rm{CL_s}$ results into Bayesian combinations.
N-Salicylideneamine Derivatives with TEMPO Substituents
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ShinÃ¢Â€Â™ichi Nakatsuji
2004-08-01
Full Text Available Three N-salicylideneamine derivatives bearing TEMPO (2,2,6,6-tetra- methyl-1-piperidinyloxy substituents were prepared in order to study their structure and property relationships and to investigate the possibilities of the existence of heat and/or light responsive magnetic properties. Curie-Weiss behavior with weak ferromagnetic intermolecular spin-spin interactions was observed in one of the radicals, while antiferromagnetic interactions were predominant for the other radicals and the structure-property relationships were investigated for the radical compounds from their crystal structures obtained by X-ray analyses. Preliminary results of the examination of their responses towards light and heat are also described.
Cationically polymerizable monomers derived from renewable sources
Energy Technology Data Exchange (ETDEWEB)
Crivello, J.V.
1992-10-01
The objectives of this project are to design and synthesize novel monomers which orginate from renewable biological sources and to carry out their rapid, efficient, pollution-free and energy efficient cationic polymerization to useful products under the influence of ultraviolet light or heat. A summary of the results of the past year's research on cationically polymerizable monomers derived from renewable sources is presented. Three major areas of investigation corresponding to the different classes of naturally occurring starting materials were investigated; epoxidized terpenes and natural rubber and vinyl ethers from alcohols and carbohydrates.
[A new eremophilane derivative from Senecio dianthus].
Han, He-Dong; Hu, Hai-Qing; Li, Yan; Wang, Xiao-Ling
2013-10-01
A new eremophilane derivative, 4,5,11-trimethyl-9( 10), 7 ( 11) -eremophiladien-8-keto-12-carboxylic acid-beta-D-glucopyranoside( which named dianthuside A) 1 and four known compounds, 5,7,4'-trihydroxy-flavonone-3-0-beta-D-glucoside (2), quercetin-3-0-beta-D-glucoside(3) ,hyperin(4) and rutin(5) have been isolated from the aerial part of Senecio dianthus. Their structures were elucidated by physicochemical properties and spectroscopic data analysis. Compounds 2, 4 and 5 were isolated from this plant for the first time.
Sesquiterpenoid derivatives from Ferula ferulaeoides (Steud.) Korov.
Meng, He; Li, Guoyu; Huang, Jian; Zhang, Ke; Wei, Xiuyan; Ma, Yueping; Zhang, Cui; Wang, Jinhui
2013-02-01
Eight sesquiterpenoids, named Ferulaeone A-H (1-8), and seven known sesquiterpenoid derivatives were isolated from the roots of Ferula ferulaeoides (Steud.) Korov. Their structures were established by comprehensive spectroscopic analysis, and biosynthetic pathways leading to these compounds were proposed. The cytotoxicity of all these isolates against HepG2, MCF-7, and C6 cancer cell lines was evaluated and compounds 6-11, 13 exihibited various degrees of cytotoxic effect. Among them, compounds 9-11 displayed the highest potency against C6 with IC(50) values 34, 36, and 31 μM, respectively.
Synthesis and Pharmacological Activity of Diterpenylnaphthoquinone Derivatives
Directory of Open Access Journals (Sweden)
Guillermo Schmeda-Hirschmann
2011-10-01
Full Text Available New diterpenylquinones, combining a diterpene diacid and a naphthoquinone, were prepared from junicedric acid and lapachol. The new derivatives were assessed as gastroprotective agents by the HCl-EtOH-induced gastric lesions model in mice as well as for basal cytotoxicity on the following human cell lines: Normal lung fibroblasts (MRC-5, gastric epithelial adenocarcinoma (AGS, and hepatocellular carcinoma (Hep G2. Several of the new compounds were significantly active as antiulcer agents and showed selective cytotoxicity against AGS cells.
Nanocomposites Derived from Polymers and Inorganic Nanoparticles
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In-Yup Jeon
2010-06-01
Full Text Available Polymers are considered to be good hosting matrices for composite materials because they can easily be tailored to yield a variety of bulk physical properties. Moreover, organic polymers generally have long-term stability and good processability. Inorganic nanoparticles possess outstanding optical, catalytic, electronic and magnetic properties, which are significantly different their bulk states. By combining the attractive functionalities of both components, nanocomposites derived from organic polymers and inorganic nanoparticles are expected to display synergistically improved properties. The potential applications of the resultant nanocomposites are various, e.g. automotive, aerospace, opto-electronics, etc. Here, we review recent progress in polymer-based inorganic nanoparticle composites.
Analytically Derived Wind Wave Growth Relations
Institute of Scientific and Technical Information of China (English)
管长龙; 孙群
2002-01-01
By the use of the 3/2 power law presented by Toba combined with the significant wave energy balance equation forwind wave, wind wave growth at a limited fetch is analytically investigated. The new wind wave growth relations(WWGRs) are analytically derived with sheltering coefficient and wind drag coefficient as parameters. The geometricalaverage of observational values of sheltering coefficient and the arithmetic average of observational values of wind drag co-efficient are applied to determine the new WWGRs. Comparisons with existing empirical WWGRs are made.
Photoelectrochemical Properties of Graphene and Its Derivatives
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Alberto Adán-Más
2013-07-01
Full Text Available Graphene and its derivatives combine a numerous range of supreme properties that can be useful in many applications. The purpose of this review is to analyse the photoelectrochemical properties of pristine graphene, graphene oxide (GO and reduced graphene oxide (rGO and their impact on semiconductor catalysts/quantum dots. The mechanism that this group of materials follows to improve their performance will be cleared by explaining how those properties can be exploited in several applications such as photo-catalysts (degradation of pollutants and photovoltaics (solar cells.
Catalysts derived from waste slag for transesterification
Institute of Scientific and Technical Information of China (English)
Xiaowei Zhang; Wei Huang
2011-01-01
MgO-CaO/SiO2 solid catalysts derived from waste slag (WS) of metal magnesium plant were prepared.The catalytic performances were evaluated in the transesterification of rapeseed oil with methanol to biodiesel in a 500 mL three-necked reactor under atmospheric pressure.The basic strengh of the catalyst reached 22.0 measured by indicators accroding to Hammett scale.The results show that the MgO-CaO/SiO2 is an excellent catalyst for transesterification, and the conversion of rapeseed oil reach 98％ under the optimum condition.
Black holes in higher derivative gravity.
Lü, H; Perkins, A; Pope, C N; Stelle, K S
2015-05-01
Extensions of Einstein gravity with higher-order derivative terms arise in string theory and other effective theories, as well as being of interest in their own right. In this Letter we study static black-hole solutions in the example of Einstein gravity with additional quadratic curvature terms. A Lichnerowicz-type theorem simplifies the analysis by establishing that they must have vanishing Ricci scalar curvature. By numerical methods we then demonstrate the existence of further black-hole solutions over and above the Schwarzschild solution. We discuss some of their thermodynamic properties, and show that they obey the first law of thermodynamics.
VARIOUS APPROACHES FOR SYNTHESIS OF IMIDAZOLE DERIVATIVES
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Bharti Ashish
2011-04-01
Full Text Available Imidazole, a five-membered heterocycle having three carbon atoms, two nitrogen atoms, and two double bonds, having efficient antimalarial, anti-inflammatory, antibacterial activity against Escherichia coil, Staphylococcus aureus and Pseudomonas aeruginosa, anti-cancer, mutagenic activity against Salmonella typhimurium, antifungal, antimicrobial, insecticidal, anti-allergic activity etc. The presence of heterocyclic structures exerts various physiologic effects on the body. In the present study we have reviewed several newer approches of synthesizing the substituted imidazole derivatives via catalytic reaction & by the application of various suitable reagents.
Adipose derived stem cells and nerve regeneration
Institute of Scientific and Technical Information of China (English)
Alessandro Faroni; Richard JP Smith; Adam J Reid
2014-01-01
Injuries to peripheral nerves are common and cause life-changing problems for patients along-side high social and health care costs for society. Current clinical treatment of peripheral nerve injuries predominantly relies on sacriifcing a section of nerve from elsewhere in the body to pro-vide a graft at the injury site. Much work has been done to develop a bioengineered nerve graft, precluding sacriifce of a functional nerve. Stem cells are prime candidates as accelerators of re-generation in these nerve grafts. This review examines the potential of adipose-derived stem cells to improve nerve repair assisted by bioengineered nerve grafts.
Derivation of an applied nonlinear Schroedinger equation
Energy Technology Data Exchange (ETDEWEB)
Pitts, Todd Alan [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Laine, Mark Richard [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Schwarz, Jens [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Rambo, Patrick K. [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Karelitz, David B. [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
2015-01-01
We derive from first principles a mathematical physics model useful for understanding nonlinear optical propagation (including filamentation). All assumptions necessary for the development are clearly explained. We include the Kerr effect, Raman scattering, and ionization (as well as linear and nonlinear shock, diffraction and dispersion). We explain the phenomenological sub-models and each assumption required to arrive at a complete and consistent theoretical description. The development includes the relationship between shock and ionization and demonstrates why inclusion of Drude model impedance effects alters the nature of the shock operator. Unclassified Unlimited Release
A Simplified Procedure for Safety Requirements Derivation
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Eugen Ioan Gergely
2008-05-01
Full Text Available The paper develops a procedure for analysis of PLC-controlled system risk due to component failure and for derivation of safety integrity requirements for components, focusing on software requirements. The approach allows fully integrated treatment of random and systematic failure. It can be applied at different levels of design detail and at different stages of the system development lifecycle. The procedure does not address how to assess failure rates, but provides a foundation for integrating PLC software assessment into system riskassessment and for making trade-offs in design.
Boundary layer heights derived from velocity spectra
Energy Technology Data Exchange (ETDEWEB)
Hoejstrup, J.; Barthelmie, R.J. [Risoe National Lab., Roskilde (Denmark); Kaellstrand, B. [Univ. of Uppsala, Uppsala (Sweden)
1997-10-01
It is a well-known fact that the height of the mixed layer determines the size of the largest and most energetic eddies that can be observed in the unstable boundary layer, and consequently a peak can be observed in the power spectra of the along-wind velocity component at scales comparable to the mixed layer depth. We will now show how the mixed layer depth can be derived from the u-specta and the results will be compared with direct measurements using pibal and tethersonde measurements. (au)
A new selaginellin derivative from Selaginella pulvinata.
Cao, Yuan; Wu, Yong-Ping; Duan, Jin-Ao
2015-02-01
Abstract: A new selaginellin derivative named as selaginellin S (1) was isolated from the whole plants of Selaginella pulvinata (Hook. et Grev.) Maxim. (Selaginellaceae), together with a known one (selaginellin M, 2). Compounds 1 and 2 were separated and purified by silica gel and Sephadex LH-20 column chromatography. Their structures were determined on the basis of extensive spectroscopic analysis including IR, MS, 1D and 2D NMR experiments, as well as ECD calculations. Compound 1 is a key intermidiant in the biosynthesis pathway of selaginellins. Compound 2 is first reported in this plant.
Derivation of an Applied Nonlinear Schroedinger Equation.
Energy Technology Data Exchange (ETDEWEB)
Pitts, Todd Alan; Laine, Mark Richard; Schwarz, Jens; Rambo, Patrick K.; Karelitz, David B.
2015-01-01
We derive from first principles a mathematical physics model useful for understanding nonlinear optical propagation (including filamentation). All assumptions necessary for the development are clearly explained. We include the Kerr effect, Raman scattering, and ionization (as well as linear and nonlinear shock, diffraction and dispersion). We explain the phenomenological sub-models and each assumption required to arrive at a complete and consistent theoretical description. The development includes the relationship between shock and ionization and demonstrates why inclusion of Drude model impedance effects alters the nature of the shock operator. Unclassified Unlimited Release
Derivational and Semantic Relations of Croatian Verbs
Directory of Open Access Journals (Sweden)
Krešimir Šojat
2012-12-01
Full Text Available This paper deals with certain morphosemantic relations between Croatian verbs and discusses their inclusion in Croatian WordNet. The morphosemantic relations in question are the semantic relations between unprefixed infinitives and their prefixed derivatives. We introduce the criteria for the division of aspectual pairs and further discuss verb prefixation which results in combinations of prefixes and base forms that can vary in terms of meaning from compositional to completely idiosyncratic. The focus is on the regularities in semantic modifications of base forms modified by one prefix. The aim of this procedure is to establish a set of morphosemantic relations based on regular or reoccuring meaning alternations.
Medicinal Chemistry Perspective of Fused Isoxazole Derivatives.
Barmade, Mahesh A; Murumkar, Prashant R; Sharma, Mayank Kumar; Yadav, Mange Ram
2016-01-01
Nitrogen containing heterocyclic rings with an oxygen atom is considered as one of the best combination in medicinal chemistry due to their diversified biological activities. Isoxazole, a five membered heterocyclic azole ring is found in naturally occuring ibetonic acid along with some of the marketed drugs such as valdecoxib, flucloxacillin, cloxacillin, dicloxacillin, and danazol. It is also significant for showing antipsychotic activity in risperidone and anticonvulsant activity in zonisamide, the marketed drugs. This review article covers research articles reported till date covering biological activity along with SAR of fused isoxazole derivatives.
A New Bezoxepine Derivative from Senecio desfontainei
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Syed Hamid Hussain
2013-08-01
Full Text Available Phytochemical investigation of the aerial parts of Senecio desfontainei afforded one new benzoxepin derivative, Senecioside (1 along with eleven known compounds (2-12. Their structures were assigned from 1H and 13C NMR spectra, DEPT and by 2D COSY, NOE, HSQC and HMBC experiments. All these compounds were tested for antioxidant activity in the 1,1-diphenyl-2-picrylhydrazyl (DPPH radical scavenging assay. Among them, compounds 2, 3, 4, 6 and 9 showed significant antioxidant activity against DPPH radicals.
Lignin-Derived Advanced Carbon Materials.
Chatterjee, Sabornie; Saito, Tomonori
2015-12-07
Lignin is a highly abundant source of renewable carbon that can be considered as a valuable sustainable source of biobased materials. By applying specific pretreatments and manufacturing methods, lignin can be converted into a variety of value-added carbon materials. However, the physical and chemical heterogeneities of lignin complicate its use as a feedstock. Herein lignin manufacturing process, the effects of pretreatments and manufacturing methods on the properties of product lignin, and structure-property relationships in various applications of lignin-derived carbon materials, such as carbon fibers, carbon mats, activated carbons, carbon films, and templated carbon, are discussed.
Molecular Recognition Studies on Naphthyridine Derivatives
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José Carlos Iglesias-Sánchez
2010-03-01
Full Text Available The association constants Kb of three hosts I–III designed to have both enhanced hydrogen bonding donor strength and conformational preorganization with biotin analogues 1–5 are reported. 1H-NMR titrations under two different concentration conditions have been employed to determine the association constants Kb. A statistical analysis using a presence absence matrix has been applied to calculate the different contributions. Hydrogen bond interactions make naphthyridine derivatives II and III potent binders and effective receptors for (+-biotin methyl ester (1, due to the complex stabilization by additional hydrogen bonds.
Portfolio Selection Model with Derivative Securities
Institute of Scientific and Technical Information of China (English)
王春峰; 杨建林; 蒋祥林
2003-01-01
Traditional portfolio theory assumes that the return rate of portfolio follows normality. However, this assumption is not true when derivative assets are incorporated. In this paper a portfolio selection model is developed based on utility function which can capture asymmetries in random variable distributions. Other realistic conditions are also considered, such as liabilities and integer decision variables. Since the resulting model is a complex mixed-integer nonlinear programming problem, simulated annealing algorithm is applied for its solution. A numerical example is given and sensitivity analysis is conducted for the model.
Studies on some derivatives of oxamniquine
Energy Technology Data Exchange (ETDEWEB)
el-Hamouly, W.; Pica-Mattoccia, L.; Cioli, D.; Schwartz, H.M.; Archer, S.
1988-08-01
On the basis of the remarkable biological similarities between hycanthone and oxamniquine and as a sequel to our finding that some esters of hycanthone are active against hycanthone-resistant schistosomes, we prepared oxamniquine acetate, oxamniquine N-methylcarbamate, and four substituted phenylsulfonohydrazones of oxamniquine aldehyde. These compounds were tested for their effect on survival of and on (/sup 3/H)uridine incorporation into hycanthone-sensitive and -resistant Schistosoma mansoni. All of these derivatives were effective to a greater or lesser degree in killing worms and in inhibiting (/sup 3/H)uridine incorporation in the sensitive strain, but none was effective in the resistant strain.
Indian Academy of Sciences (India)
H Mohan; A Adhikary; V Jain; J P Mittal
2000-08-01
The pulse radiolysis technique has been employed to investigate the reaction of DNA-minor-groove ligand bisbenzimidazole Hoechst 33258 with pyrimidine and purine nucleotide-derived radicals. Formation of an N-centred Hoechst-33258 radical is observed. Bimolecular rate constants and the yields of Hoechst-33258 radical have been evaluated. While the rate constant for the reaction of pyrimidine-derived radicals with Hoechst-33258 remained the same (1-2) × 109 dm3 mol-1s-1, the yields of the Hoechst-33258 radical varied from 25% (5 -cytidine monophosphate) to 75% (5 -guanosine monophosphate) under anoxic conditions. The rate constant values for the reaction of purine-derived radicals with Hoechst-33258, under oxic and anoxic conditions, remained the same whereas with pyrimidine-derived radicals, the rate constant value under oxic conditions was about two orders of magnitude lower than under anoxic conditions. The difference in the yields of Hoechst-33258 radical with various nucleotide-derived radicals suggest the formation of different types of radicals and that the reaction mainly occurs by electron transfer from Hoechst-33258 to the nucleotide radicals.
GENERALIZED DERIVATIONS ON PARABOLIC SUBALGEBRAS OF GENERAL LINEAR LIE ALGEBRAS
Institute of Scientific and Technical Information of China (English)
陈正新
2014-01-01
Let P be a parabolic subalgebra of a general linear Lie algebra gl(n, F) over a field F, where n ≥ 3, F contains at least n different elements, and char(F) 6= 2. In this article, we prove that generalized derivations, quasiderivations, and product zero derivations of P coincide, and any generalized derivation of P is a sum of an inner derivation, a central quasiderivation, and a scalar multiplication map of P. We also show that any commuting automorphism of P is a central automorphism, and any commuting derivation of P is a central derivation.
A derivability criterion based on the existence of adjunctions
Rodriguez-Gonzalez, Beatriz
2012-01-01
In this paper we introduce a derivability criterion of functors based on the existence of adjunctions rather than on the existence of resolutions. It constitutes a converse of Quillen-Maltsiniotis derived adjunction theorem. We present two applications of our derivability criterion. On the one hand, we prove that the two notions for homotopy colimits corresponding to Grothendieck derivators and Quillen model categories are equivalent. On the other hand, we deduce that the internal hom for derived Morita theory constructed by B. To\\"en is indeed the right derived functor of the internal hom of dg-categories.
Tobin Tax: Arguments and Current Derivative Studies
Directory of Open Access Journals (Sweden)
Ozekicioglu Seda
2015-04-01
Full Text Available Tobin Tax and its derivative applications have started to be discussed again in many platforms as the issue regarding taxation of short-term capital movements has become an agenda among international communities such as European Union (EU and G20 since the beginning of 2000s. In this study, Tobin Tax, which is the first significant step towards taxation of foreign currency transactions, has been discussed theoretically and considering its possible effects on application. Also, in this context, the initiatives of countries such as USA, Belgium, France and Austria regarding international implementation of Tobin Tax and its derivatives are being evaluated. The intended use of the taxes, determination of transactions exempt from tax and international cooperation in the implementation of taxation are possible problems that can be faced regarding Tobin Tax. In this study the conclusion, which the effects of Tobin Tax in developing and developed countries will be different but imposing such tax regarding cyclic balance of the world economy will be a positive improvement, has been reached.
PUFA-derived endocannabinoids: an overview.
Cascio, Maria Grazia
2013-11-01
Following on from the discovery of cannabinoid receptors, of their endogenous agonists (endocannabinoids) and of the biosynthetic and metabolic enzymes of the endocannabinoids, significant progress has been made towards the understanding of the role of the endocannabinoid system in both physiological and pathological conditions. Endocannabinoids are mainly n-6 long-chain PUFA (LCPUFA) derivatives that are synthesised by neuronal cells and inactivated via a two-step process that begins with their transport from the extracellular to the intracellular space and culminates in their intracellular degradation by hydrolysis or oxidation. Although the enzymes responsible for the biosynthesis and metabolism of endocannabinoids have been well characterised, the processes involved in their cellular uptake are still a subject of debate. Moreover, little is yet known about the roles of endocannabinoids derived from n-3 LCPUFA such as EPA and DHA. Here, I provide an overview of what is currently known about the mechanisms for the biosynthesis and inactivation of endocannabinoids, together with a brief analysis of the involvement of the endocannabinoids in both food intake and obesity. Owing to limited space, recent reviews will be often cited instead of original papers.
Primer on electricity futures and other derivatives
Energy Technology Data Exchange (ETDEWEB)
Stoft, S.; Belden, T.; Goldman, C.; Pickle, S.
1998-01-01
Increased competition in bulk power and retail electricity markets is likely to lower electricity prices, but will also result in greater price volatility as the industry moves away from administratively determined, cost-based rates and encourages market-driven prices. Price volatility introduces new risks for generators, consumers, and marketers. Electricity futures and other derivatives can help each of these market participants manage, or hedge, price risks in a competitive electricity market. Futures contracts are legally binding and negotiable contracts that call for the future delivery of a commodity. In most cases, physical delivery does not take place, and the futures contract is closed by buying or selling a futures contract on or near the delivery date. Other electric rate derivatives include options, price swaps, basis swaps, and forward contracts. This report is intended as a primer for public utility commissioners and their staff on futures and other financial instruments used to manage price risks. The report also explores some of the difficult choices facing regulators as they attempt to develop policies in this area.
Very Massive Tracers and Higher Derivative Biases
Fujita, Tomohiro; Senatore, Leonardo; Vlah, Zvonimir; Angulo, Raul
2016-01-01
Most of the upcoming cosmological information will come from analyzing the clustering of the Large Scale Structures (LSS) of the universe through LSS or CMB observations. It is therefore essential to be able to understand their behavior with exquisite precision. The Effective Field Theory of Large Scale Structures (EFTofLSS) provides a consistent framework to make predictions for LSS observables in the mildly non-linear regime. In this paper we focus on biased tracers. We argue that in calculations at a given order in the dark matter perturbations, highly biased tracers will underperform because of their larger higher derivative biases. A natural prediction of the EFTofLSS is therefore that by simply adding higher derivative biases, all tracers should perform comparably well. We implement this prediction for the halo-halo and the halo-matter power spectra at one loop, and the halo-halo-halo, halo-halo-matter, and halo-matter-matter bispectra at tree-level, and compare with simulations. We find good agreement ...
Formulation of benzoporphyrin derivatives in Pluronics.
Chowdhary, Rubinah K; Chansarkar, Namrata; Sharif, Isha; Hioka, Noboru; Dolphin, David
2003-03-01
This study investigates the potential of Pluronics for the formulation of tetrapyrrole-based photosensitizers, with a particular focus on B-ring benzoporphyrin derivatives. The B-ring derivatives have a high tendency to aggregate in aqueous solutions, and this poses a significant formulation problem. Pluronics are ABA-type triblock copolymers composed of a central hydrophobic polypropylene oxide section with two hydrophilic polyethylene oxide sections of equal length at either end. Out of a range of different commercially available block copolymers studied, it was found that the longer the hydrophobic block, the better the stabilization of tetrapyrrolic drugs in monomeric form in aqueous suspensions. Of these the best performance was observed in the micelle-forming Pluronic P123. Micelle size determination by laser light scattering confirmed that particle size in stable Pluronic formulations was around 20 nm. Pluronics such as L122 formed emulsions spontaneously without the need for emulsion stabilizers; emulsions were highly stable at ambient temperatures over several days and also highly effective as potential drug delivery agents.
Cell-derived microparticles and the lung
Directory of Open Access Journals (Sweden)
Dario Nieri
2016-09-01
Full Text Available Cell-derived microparticles are small (0.1–1 μm vesicles shed by most eukaryotic cells upon activation or during apoptosis. Microparticles carry on their surface, and enclose within their cytoplasm, molecules derived from the parental cell, including proteins, DNA, RNA, microRNA and phospholipids. Microparticles are now considered functional units that represent a disseminated storage pool of bioactive effectors and participate both in the maintenance of homeostasis and in the pathogenesis of diseases. The mechanisms involved in microparticle generation include intracellular calcium mobilisation, cytoskeleton rearrangement, kinase phosphorylation and activation of the nuclear factor-κB. The role of microparticles in blood coagulation and inflammation, including airway inflammation, is well established in in vitro and animal models. The role of microparticles in human pulmonary diseases, both as pathogenic determinants and biomarkers, is being actively investigated. Microparticles of endothelial origin, suggestive of apoptosis, have been demonstrated in the peripheral blood of patients with emphysema, lending support to the hypothesis that endothelial dysfunction and apoptosis are involved in the pathogenesis of the disease and represent a link with cardiovascular comorbidities. Microparticles also have potential roles in patients with asthma, diffuse parenchymal lung disease, thromboembolism, lung cancer and pulmonary arterial hypertension.
Healthy degenerate theories with higher derivatives
Motohashi, Hayato; Suyama, Teruaki; Yamaguchi, Masahide; Langlois, David
2016-01-01
In the context of classical mechanics, we study the conditions under which higher-order derivative theories can evade the so-called Ostrogradsky instability. More precisely, we consider general Lagrangians with second order time derivatives, of the form $L(\\ddot\\phi^a,\\dot\\phi^a,\\phi^a;\\dot q^i,q^i)$ with $a = 1,\\cdots, n$ and $i = 1,\\cdots, m$. For $n=1$, assuming that the $q^i$'s form a nondegenerate subsystem, we confirm that the degeneracy of the kinetic matrix eliminates the Ostrogradsky instability. The degeneracy implies, in the Hamiltonian formulation of the theory, the existence of a primary constraint, which generates a secondary constraint, thus eliminating the Ostrogradsky ghost. For $n>1$, we show that, in addition to the degeneracy of the kinetic matrix, one needs to impose extra conditions to ensure the presence of a sufficient number of secondary constraints that can eliminate all the Ostrogradsky ghosts. When these conditions that ensure the disappearance of the Ostrogradsky instability are s...
A One Line Derivation of EGARCH
Directory of Open Access Journals (Sweden)
Michael McAleer
2014-06-01
Full Text Available One of the most popular univariate asymmetric conditional volatility models is the exponential GARCH (or EGARCH specification. In addition to asymmetry, which captures the different effects on conditional volatility of positive and negative effects of equal magnitude, EGARCH can also accommodate leverage, which is the negative correlation between returns shocks and subsequent shocks to volatility. However, the statistical properties of the (quasi- maximum likelihood estimator of the EGARCH parameters are not available under general conditions, but rather only for special cases under highly restrictive and unverifiable conditions. It is often argued heuristically that the reason for the lack of general statistical properties arises from the presence in the model of an absolute value of a function of the parameters, which does not permit analytical derivatives, and hence does not permit (quasi- maximum likelihood estimation. It is shown in this paper for the non-leverage case that: (1 the EGARCH model can be derived from a random coefficient complex nonlinear moving average (RCCNMA process; and (2 the reason for the lack of statistical properties of the estimators of EGARCH under general conditions is that the stationarity and invertibility conditions for the RCCNMA process are not known.
Boson Stars in Higher Derivative Gravity
Baibhav, Vishal
2016-01-01
In this paper, we have constructed Boson star (BS) solutions in four dimensional scalar-Gauss-Bonnet (sGB) theory. In order to have non-trivial effect from Gauss-Bonnet term, we invoked non-minimal coupling between a complex scalar field and the Gauss-Bonnet term with a coupling parameter, $\\alpha$. We show that the scalar field can no longer take arbitrary value at the center of the star. Furthermore, boson-stars in our higher derivative theory turn out to be slightly massive but much more compact than those in the usual Einstein's gravity. Interestingly, we found that for $\\alpha0.8$, binding energy for all possible boson stars is always negative. This implies that these stars are intrinsically stable against the decay by dispersion. We also present the mass-radius and mass-frequency curves for boson-star and compare them with other compact objects in gravity models derived from Gauss-Bonnet term.
Boson stars in higher-derivative gravity
Baibhav, Vishal; Maity, Debaprasad
2017-01-01
In this paper, we have constructed boson star (BS) solutions in four-dimensional scalar-Gauss-Bonnet (sGB) theory. In order to have a nontrivial effect from the Gauss-Bonnet term, we invoked nonminimal coupling between a complex scalar field and the Gauss-Bonnet term with a coupling parameter, α . We show that the scalar field can no longer take arbitrary value at the center of the star. Furthermore, boson stars in our higher-derivative theory turn out to be slightly massive but much more compact than those in the usual Einstein's gravity. Interestingly, we found that for α 0.8 , binding energy for all possible boson stars is always negative. This implies that these stars are intrinsically stable against the decay by dispersion. However, for -0.4 negative binding energy depending on scalar field value at the center of the star. We also present the mass-radius and mass-frequency curves for boson stars and compare them with other compact objects in gravity models derived from the Gauss-Bonnet term.
Effects of titanium dioxide nanoparticles derived from ...
Increased manufacture of TiO2 nano-products has caused concern about the potential toxicity of these products to the environment and in public health. Identification and confirmation of the presence of TiO2 nanoparticles derived from consumer products as opposed to industrial TiO2 NPs warrants examination in exploring the significance of their release and resultant impacts on the environment. To this end we examined the significance of the release of these particles and their toxic effect on the marine diatom algae Thalassiosira pseudonana. Our results indicate that nano-TiO2 sunscreen and toothpaste exhibit more toxicity in comparison to industrial TiO2, and inhibited the growth of the marine diatom Thalassiosira pseudonana. This inhibition was proportional to the exposure time and concentrations of nano-TiO2. Our findings indicate a significant effect, and therefore further research is warranted in evaluation and assessment of the toxicity of modified nano-TiO2 derived from consumer products and their physicochemical properties. Submit to journal Environmental Science and Pollution Research.
Fractional derivatives. An introduction; Derivate frazionarie. Che cosa sono, a cosa servono
Energy Technology Data Exchange (ETDEWEB)
Dattoli, G. [ENEA, Div. Fisica Applicata, Centro Ricerche Frascati, Rome (Italy)
2001-07-01
In this item is presented a brief survey of fractional calculus and of the relevant applications. In the work are discussed different points of view of the operation of fractional derivative and present a unifying definition. The role played by fractional derivatives and integrals within the framework of integral transform is analyzed. [Italian] In questo articolo si traccia un profilo del cosidetto calcolo frazionario e delle relative applicazioni a problemi di matematica pura ed applicata. Si discutono varie definizioni dell'operazione di derivata frazionaria, non tutte coincidenti fra loro, e si mostra come sia possibile proporre una definizione univoca che inglobi tutte le altre. Si analizza infine il ruolo giocato dalle derivate e dagli integrali frazionari e, piu' in generale, quello degli operatori differenziali ad esponente frazionario, nell'ambito della teoria delle rappresentazioni integrali.
A new diketopiperazine derivative from a deep sea-derived Streptomyces sp. SCSIO 04496.
Luo, Minghe; Tang, Guiling; Ju, Jianhua; Lu, Laichun; Huang, Hongbo
2016-01-01
A new diketopiperazine (DKP) derivative, (6R,3Z)-3-benzylidene-6-isobutyl-1-methyl piperazine-2,5-dione (1), as well as five known DKPs 2-6 was isolated from a deep sea-derived Streptomyces sp. SCSIO 04496. The structure of 1 was elucidated using a combination of 1D and 2D NMR, HR-ESI-MS and chiral-phase HPLC techniques. Compounds 1-6 did not show cytotoxic activity at a concentration of 100 μM in bioactivity assay.
Institute of Scientific and Technical Information of China (English)
TIAN Dongyan; JIN Ming; DUI Guansuo
2006-01-01
A new approach for the derivation of the principal invariants of the stretch tensor with respect to the right Cauchy Green tensor is presented in this paper. According to the definition of the derivation of tensor function, the three first-order derivatives for the principal invariants of the stretch tensor are obtained through derivation directly to the right Cauchy-Green tensor by incremental method. Then the three second-order derivatives are yielded by the derivation to the right Cauchy-Green strain tensor directly. Furthermore, an explicit expression of the tangent modulus of the general Varga material is given as an example.
Biologic Rhythms Derived from Siberian Mammoths Hairs
Energy Technology Data Exchange (ETDEWEB)
M Spilde; A Lanzirotti; C Qualls; G Phillips; A Ali; L Agenbroad; O Appenzeller
2011-12-31
Hair is preserved for millennia in permafrost; it enshrines a record of biologic rhythms and offers a glimpse at chronobiology as it was in extinct animals. Here we compare biologic rhythms gleaned from mammoth's hairs with those of modern human hair. Four mammoths' hairs came from varying locations in Siberia 4600 km, four time zones, apart ranging in age between 18,000 and 20,000 years before present. We used two contemporaneous human hairs for comparison. Power spectra derived from hydrogen isotope ratios along the length of the hairs gave insight into biologic rhythms, which were different in the mammoths depending on location and differed from humans. Hair growth for mammoths was {approx}31 cms/year and {approx}16 cms/year for humans. Recurrent annual rhythms of slow and fast growth varying from 3.4 weeks/cycles to 8.7 weeks/cycles for slow periods and 1.2 weeks/cycles to 2.2 weeks/cycles for fast periods were identified in mammoth's hairs. The mineral content of mammoth's hairs was measured by electron microprobe analysis (k-ratios), which showed no differences in sulfur amongst the mammoth hairs but significantly more iron then in human hair. The fractal nature of the data derived from the hairs became evident in Mandelbrot sets derived from hydrogen isotope ratios, mineral content and geographic location. Confocal microscopy and scanning electron microscopy showed varied degrees of preservation of the cuticle largely independent of age but not location of the specimens. X-ray fluorescence microprobe and fluorescence computed micro-tomography analyses allowed evaluation of metal distribution and visualization of hollow tubes in the mammoth's hairs. Seasonal variations in iron and copper content combined with spectral analyses gave insights into variation in food intake of the animals. Biologic rhythms gleaned from power spectral plots obtained by modern methods revealed life style and behavior of extinct mega-fauna.
Synthesis of (-)-arctigenin derivatives and their anticancer activity.
Gui-Rong, Chen; Li-Ping, Cai; De-Qiang, Dou; Ting-Guo, Kang; Hong-Fu, Li; Fu-Rui, Li; Ning, Jiang
2012-01-01
The natural dibenzylbutyrolactone type lignanolide (-)-arctigenin, which was prepared from fructus arctii, showed obvious anticancer activity. The synthesis of four new (-)-arctigenin derivatives and their anticancer bioactivities were examined. The structures of the four new synthetic derivatives were elucidated.