High Performance Liquid Chroma Tography of Cytokinins

1985 ◽  
Vol 8 (2) ◽  
pp. 369-379 ◽  
Author(s):  
Arild Ernstsen ◽  
Einar Jensen
Keyword(s):  
High Performance ◽  
High Performance Liquid Chroma

scholarly journals Research of Polyocarboxy Acid Water-Reducer with Modified Ployether and its Effect on Concrete’s Workability

2011 ◽  
Vol 250-253 ◽  
pp. 2032-2035 ◽  
Author(s):  
Lu Feng Pang ◽  
Xin Xin Zhou
Keyword(s):  
High Performance ◽  
High Performance Liquid Chroma ◽  
Reducing Agents ◽  
Acid Water ◽  
Concrete Mixture ◽  
Synthetic Temperature ◽  
Naphthalene Series ◽  
High Range

In this paper, polycarboxylic type high performance water reducers have been synthesized through using TPEG modified monomer. If synthetic temperature and addition time of copolymer monomers can be controlled, the performance of polycarboxylic superplasticizer will be improved. Testing results indicates that when temperature is at 60~65°C, addition time of copolymer monomers is three hours, the performance of superplasticizer is best. Through High Performance Liquid Chroma- tography (HPLC) testing, we can find it is almost the same with the famous brand abroad of the same type. The ues of polycarboxylic type high performance water reducers cooperated with naphthalene series high range water reducing agents thereby markedly improv the workability of concrete mixture.

High Performance Liquid Chroma tographic Analysis of Dicofol Acaricide

1980 ◽  
Vol 63 (6) ◽  
pp. 1296-1299
Author(s):  
Alan M Rothman
Keyword(s):  
Acetic Acid ◽  
High Resolution ◽  
Mobile Phase ◽  
High Performance ◽  
High Performance Liquid Chromatographic ◽  
High Performance Liquid Chroma ◽  
Hplc Method ◽  
Reverse Phase ◽  
In Series ◽  
Liquid Chromatographic

Abstract Kelthane Technical, a dicofol acaricide marketed by Rohm and Haas Co., and 18 impurity components can be resolved by a new reverse phase high performance liquid chromatographic (HPLC) method using a methanol-water-acetic acid (75+25+0.2) mobile phase, a high resolution C8 column in series with a short Cl8 s guard column, and detection at 254 nm. Relative elution volumes: and relative sensitivities for all known Kelthane Technical components are reported. This HPLC method has few co-elution problems, can be performed on a basic HPLC system, avoids the thermal degradation of Kelthane experienced in the previously established gas-liquid chromatographic (GLC) procedures, and can detect all impurity components to at least 0.1% level.

Effects of parasitism on the octopamine content of the central nervous system of Manduca sexta: a possible mechanism underlying host behavioural change

2000 ◽  
Vol 78 (9) ◽  
pp. 1580-1587 ◽  
Author(s):  
Shelley A Adamo ◽  
Kelly L Shoemaker
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Manduca Sexta ◽  
High Performance ◽  
Behavioural Change ◽  
Parasitic Wasp ◽  
Temporal Correlation ◽  
High Performance Liquid Chroma ◽  
Host Feeding ◽  
The Central Nervous System

The parasitic wasp Cotesia congregata lays its eggs inside the larva of Manduca sexta (tobacco hornworm). Beginning about 12 h before the wasp larvae emerge from the host, host feeding and locomotion decline. The octopamine content of the central nervous system (CNS) of parasitized hosts was measured using high-performance liquid chroma tography with electrochemical detection. Concomitant with the decrease in host feeding and locomotion, the octopamine content of the host's brain (supra- and sub-esophageal ganglia), thoracic ganglia, and abdominal ganglia increased. In nonparasitized M. sexta, the octopamine content of the CNS did not change significantly during moult sleep, a stage in which the behaviour superficially resembles that of M. sexta after the wasps have emerged. Neither result is consistent with the hypothesis that the octopamine content within the CNS is lower in inactive insects. Nevertheless, the close temporal correlation between the change in host behaviour and CNS octopamine content suggests that alterations in the functioning of the octopaminergic system may play a role in depressing host feeding and (or) locomotion.

Pharmacokinetics of Mitomycin C in Dogs: Application of a High-Performance Liquid Chroma tograp h ic Assay

1984 ◽  
Vol 73 (9) ◽  
pp. 1220-1223 ◽  
Author(s):  
R.H. Barbhaiya ◽  
E.A. Papp ◽  
D.R. Van Harken ◽  
R.D. Smyth
Keyword(s):  
Mitomycin C ◽  
High Performance ◽  
High Performance Liquid Chroma

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

Use of the Magnetostatic Analogue In Electromagnetic Lens Engineering

1970 ◽  
Vol 28 ◽  
pp. 360-361
Author(s):  
John W. Coleman
Keyword(s):  
Boundary Conditions ◽  
High Performance ◽  
Force Fields ◽  
Optical Design ◽  
Direct Conversion ◽  
Design Engineering ◽  
Design Data ◽  
Scalar Potentials ◽  
Geometric Elements ◽  
At Will

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

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