检索结果-内蒙古大学图书馆

Enzymatic fragments as possible regulatory oligopeptides

NEUROCHEMICAL JOURNAL 2007年第3期1卷 188-195页

作者： Zamyatnin, A. A. Borchikov, A. S. Russian Acad Sci Bach Inst Biochem Moscow 119071 Russia Univ Tecn Federico Santa Maria Ctr Biotechnol Valparaiso Chile

The enzyme, bromelain, is known to catalyze protein proteolysis and to activate many protective processes occurring with participation of the nervous, immune, and endocrine systems. In this connection, a computer analysis of all the possible 4-6-member fragments of bromelain was performed by means of a comparison of their primary structures with amino acid sequences of all the known natural oligopeptides. Information from the EROP-Moscow data base that contains data on the structures and functions of natural oligopeptides and specially written computer programs were used for this purpose. It was shown that tetra-, penta-, and hexapeptide fragments of the bromelain molecules are involved in amino acid sequences of many natural oligopeptides, including antimicrobial oligopeptides, toxins, neuropeptides, and hormones. These results confirmed deep relationship between the basic regulatory systems. In connection with the obtained data, the process of oligopeptide biogenesis, the possibility of natural formation of regulatory oligopeptides from the bromelain molecules, and correspondence of the obtained results with the conception of oligopeptide continuum are discussed. A possible practical importance of active fragments of protein enzymes in regulatory processes of a living organism is noted.

关键词： enzyme bromelain precursor peptide fragment natural oligopeptide neuropeptide neurohormone antimicrobial oligopeptide toxin primary structure the EROP-Moscow data base computer program regulation biogenesis continuum

来源：评论

学校读者我要写书评

暂无评论

Systematic performance evaluation of a continuous-scale sleep depth measure

引用

MEDICAL ENGINEERING & PHYSICS 2007年第10期29卷 1119-1131页

作者： Saastamoinen, Antti Huupponen, Eero Varri, Alpo Hasan, Joel Himanen, Sari-Leena Pirkanmaa Hosp Dist Med Imaging Ctr Dept Clin Neurophysiol FIN-33521 Tampere Finland Tampere Univ Technol Inst Signal Proc FIN-33101 Tampere Finland

In this article, systematic performance evaluation of a continuous-scale sleep depth measure will be discussed. Our main objective has been to select the adjustable analysis parameters such that the best possible correspondence between method output and standard visual sleep staging could be achieved. Sleep depth estimation was based on continuous monitoring of short-time EEG synchronization through the local mean frequency of the EEG. During the experiments, total amount of 752 different combinations of four adjustable parameters were compared based on all-night sleep EEG recordings of 15 healthy subjects. Optimization strategy applied was based on maximizing the weighted average of pair-wise separabilities of EEG mean frequency distributions in all the standard sleep stage pairs. Finally, robustness of the optimized parameters was verified with an independent dataset of 34 all-night sleep recordings. Our results show that clear topological differences between brain hemispheres and different electrode locations exist. Performance improvements of even 20-30% units can be achieved by proper selection of analysis parameters and the EEG derivation used for the analysis. Remarkable independence of system performance on the analysis window length leads to improved temporal resolution compared to that achieved through standard visual analysis. In addition to giving practical suggestions on the parameter selection, we also propose a possible method for improving stage separability especially between S2 and REM. (C) 2006 IPEM. Published by Elsevier Ltd. All rights reserved.

关键词： sleep depth performance evaluation computer-based sleep analysis computer program

来源：评论

学校读者我要写书评

暂无评论

The influence of gear hobbing on worm gear characteristics

引用

JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME 2007年第5期129卷 919-925页

作者： Simon, Vilmos Budapest Univ Technol & Econ Fac Mech Engn Dept Machine Elements Inst Machine Design H-1111 Budapest Hungary

In this paper a method is presented for the determination of the differences between the worm gear tooth surface processed by an oversized hob of finite number of teeth or by a flying tool, and the theoretically required gear tooth surface. The influence of hob oversize and machine tool settings on tooth contact pressure and transmission errors is determined. The full geometry and kinematics of gear tooth processing by an oversized hob or by a flying tool is included. The theoretical background is implemented by a computer program. By using this program, the influence of relevant design parameters of the worm gear set and the hob and of machine tool settings on processed gear tooth errors and on loaded tooth contact of the worm gear pair is investigated and discussed.

关键词： cylindrical worm gear hobbing precision load distribution transmission errors computer program

来源：评论

学校读者我要写书评

暂无评论

The discrete dipole approximation for simulation of light scattering by particles much larger than the wavelength

引用

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2007年第1-3期106卷 546-557页

作者： Yurkin, M. A. Maltsev, V. P. Hoekstra, A. G. Univ Amsterdam Fac Sci Sect Computat Sci NL-1098 SJ Amsterdam Netherlands Russian Acad Sci Inst Chem Kinet & Combust Siberian Branch Novosibirsk 630090 Russia Novosibirsk State Univ Novosibirsk 630090 Russia

In this paper we investigate the capabilities of the discrete dipole approximation (DDA) to simulate scattering from particles that are much larger than the wavelength of the incident light, and describe an optimized publicly available DDA computer program that processes the large number of dipoles required for such simulations. Numerical simulations of light scattering by spheres with size parameters x up to 160 and 40 for refractive index m = 1.05 and 2, respectively, are presented and compared with exact results of the Mie theory. Errors of both integral and angle-resolved scattering quantities generally increase with m and show no systematic dependence on x. Computational times increase steeply with both x and m, reaching values of more than 2 weeks on a cluster of 64 processors. The main distinctive feature of the computer program is the ability to parallelize a single DDA simulation over a cluster of computers, which allows it to simulate light scattering by very large particles, like the ones that are considered in this paper. Current limitations and possible ways for improvement are discussed. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： discrete dipole approximation light scattering simulation computer program

来源：评论

学校读者我要写书评

暂无评论

Total-productivity analysis of a Nigerian petroleum-product marketing company

引用

APPLIED ENERGY 2007年第11期84卷 1150-1173页

作者： Lilly, M. T. Obiajulu, U. E. Ogaji, S. O. T. Probert, S. D. Cranfield Univ Sch Engn Bedford MK43 0AL England Rivers State Univ Sci & Technol Dept Mech Engn Port Harcourt Nigeria

Productivity in Nigeria is decreasing: this has adversely affected the average standard-of-living of the population and led to economic hardship. HIV/AIDS, hunger, disease and wars have lowered African productivity and the effectivenesses of public utilities have declined, while unemployment and crime are on the increase. A computer program, which considers the combined concept of partial productivity, total productivity measurement and reliability in order to analyse the effectiveness of a firm, society or nation has been developed. Its predictions have been tested with data from a Nigerian petroleum-product marketing company, namely Rock Oil and Gas Ltd., Aba, Abia State: the management of this business is representative of those of many Nigerian firms. The developed software (see Appendix) can help in identifying the causes of productivity problems, which can so adversely affect the performance of any organisation. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： productivity partial productivity total productivity total productivity-index severity computer program

来源：评论

学校读者我要写书评

暂无评论

Application of unsteady flow analysis in designing a multiple outlets sprinkler irrigation system

引用

PADDY AND WATER ENVIRONMENT 2007年第3期5卷 181-187页

作者： Man Chi Trung Nishiyama, Soichi Anyoji, Hisao Tottori Univ Grad Sch Agr Sci Minami Ku Tottori 6808553 Japan Yamaguchi Univ Fac Agr Yamaguchi 7530815 Japan Tottori Univ Arid Land Res Ctr Tottori 6800001 Japan

A simplified method has been developed for designing and calculating sprinkling systems by cutting lines across laterals at points next to the first sprinkler with a view to divide the system into two separate parts;field and basic. Equations of lateral pressure heads were used to express the relationship between inlet pressure head and velocity of the flow pumped to laterals on the field part. The above equations were then used to set up calculating conditions for the Basic part by unsteady flow method in order to define head and discharge at downstream end of the pipe in the Basic part. The forward step method was used for determining distributions of the pressure head and the emitter discharge along each lateral. A calculating schema on computer has been carried out in order to apply the method to any sprinkling system. The procedure of analysis and calculation showed that this method is generally accurate, simple and rapid.

关键词： Lateral pressure head equation computer program Hydraulic analysis Drip irrigation

来源：评论

学校读者我要写书评

暂无评论

ASKyphoplan: a program for deformity planning in ankylosing spondylitis

引用

EUROPEAN SPINE JOURNAL 2007年第9期16卷 1445-1449页

作者： van Royen, Barend J. Scheerder, Famke J. Jansen, Eric Smit, Theo H. Vrije Univ Amsterdam Med Ctr Dept Orthopaed Surg NL-1007 MB Amsterdam Netherlands Vrije Univ Amsterdam Med Ctr Dept Phys & Med Technol Amsterdam Netherlands

A closing wedge osteotomy of the lumbar spine may be considered to correct posture and spinal balance in progressive thoracolumbar kyphotic deformity caused by ankylosing spondylitis (AS). Adequate deformity planning is essential for reliable prediction of the effect of surgical correction of the spine on the sagittal balance and horizontal gaze of the patient. The effect of a spinal osteotomy on the horizontal gaze is equal to the osteotomy angle. However, the effect of a spinal osteotomy on the sagittal balance depends on both the correction angle and the level of osteotomy simultaneously. The relation between the correction angle, the level of osteotomy and the sagittal balance of the spine can be expressed by a mathematical equation. However, this mathematical equation is not easily used in daily practice. We present the computer program ASKyphoplan that analyses and visualizes the planning procedure for sagittal plane corrective osteotomies of the spine in AS. The relationship between the planned correction angle, level of osteotomy and sagittal balance are coupled into the program. The steps taken during an ASKyphoplan run are outlined, and the clinical application is discussed. The application of the program is illustrated by the analysis of the data from a patient recently treated by a lumbar osteotomy in AS. The software can be used free of charge on the internet at http://*** under the heading "research" in the menu.

关键词： ankylosing spondylitis osteotomy spine computer program deformity planning

来源：评论

学校读者我要写书评

暂无评论

Structural changes in new rapidly-quenched Finemet type and Hitperm type alloys 20th

Structural changes in new rapidly-quenched Finemet type and ...

引用

20th Conference on Applied Crystallography

作者： Staszewski, M. Woch, M. Kolano-Burian, A. Barszcz, J. Buczek, M. Inst Nonferrous Met Sowinskiego 5 PL-44100 Gliwice Poland

ISBN: (纸本)390845140X

Structural transformations taking place during annealing of rapidly-quenched soft magnetic ribbons from the Finemet type and Hitperm type alloys were investigated. The X-ray quantitative phase analysis and X-ray diffusion scattering methods were used. It was found that the structural changes in the alloys studied, including crystallisation process and short-range ordering in the amorphous phase, are reflected by the changes in their magnetic properties. These properties, and particularly the magnitude of saturation induction B-s, depend on the content of cobalt and silicon in these alloys and on short-range order in the amorphous phase.

关键词： metallic glasses nanocrystalline materials soft-magnetic materials structure analysis computer program

来源：评论

学校读者我要写书评

暂无评论

Reliability of Three Different Visual Acuity Testing Procedures in School Children

引用

STRABISMUS 2007年第1期15卷 39-43页

作者： Schmidt-Bacher, A. Pritsch, M. Kolling, G. Univ Heidelberg Hosp Dept Ophthalmol Heidelberg Germany Univ Heidelberg Hosp Inst Med Biometry & Informat Heidelberg Germany

Aim To evaluate the usability and reliability of three different visual acuity (VA) testing procedures using Landolt C's in 8 positions with a semi-automated computer program in school children. Methods 100 school children (median 7 years, 59 boys and 41 girls) were included;only the better eye was tested. We used the semi-automated computer program CORVIS (R). VT in a forced choice method. Three different test strategies were employed, each two times: A) DIN, B) Standard-Staircase and C) Best-PEST procedure with sequences A, B, C or A, C, B. Results Average testing time was 100s +/- 45 (DIN), 59s +/- 36 (Staircase) and 77s +/- 25 (Best-PEST). The mean VA estimated with DIN was equivalent to that with the Best-PEST procedure. However, the mean VA with Standard-Staircase was one line less. In DIN, 76% of the retest scores were within 0.1 logMAR unit of the initial test score (Staircase: 72%, Best-PEST 73%). The 95% confidence interval of test-retest reliability was calculated to be -0.05 +/- 0.24 logMAR in DIN, +0.02 +/- 0.32 logMAR in Staircase, and 0.00 +/- 0.29 logMAR in Best-PEST. Conclusion A high percentage of children aged 6 to 9 years (98%) can be tested with Landolt C's (8 positions). We found a decreasing test-retest reliability starting from DIN via Best-PEST to Staircase in this configuration.

关键词： Visual acuity testing school children computer program Landolt ring test-retest reliability

来源：评论

学校读者我要写书评

暂无评论

Introduction of SOPs for initial calculated antibiotic therapy in adults -: A new computer programme at the Charite

ANASTHESIOLOGIE INTENSIVMEDIZIN NOTFALLMEDIZIN SCHMERZTHERAP...

引用

ANASTHESIOLOGIE INTENSIVMEDIZIN NOTFALLMEDIZIN SCHMERZTHERAPIE 2006年第10期41卷 626-635页

作者： Nachtigall, Irit Deja, Maria Halle, Elke Kastrup, Marc Weber-Carstens, Steffen Krieg, Hanno Puhmann, Birgit Eggers, Verena Heymann, Anja Rohr, Juergen Viviano, Edoardo von Dossow, Vera MacGuill, Martin Sander, Michael Goebel, Ulf Spies, Claudia Charite Klin Anasthesiol & Operat Intensivmed Berlin Germany

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：