Cation Exchange in Soils: An Historical and Theoretical Perspective

2015 ◽  
pp. 13-30
Author(s):  
Garrison Sposito
Keyword(s):  
Cation Exchange ◽  
Theoretical Perspective

The role of nursing in the rehabilitation of acute stroke patients: Toward a unified theoretical perspective

Pflege ◽  
1999 ◽  
Vol 12 (1) ◽  
pp. 21-27
Author(s):  
Marit Kirkevold
Keyword(s):  
Acute Stroke ◽  
Theoretical Perspective ◽  
Stroke Patients ◽  
Role Of Nursing ◽  
Rolle Der Pflegenden

Eine Übersicht der bestehenden Literatur weist auf Unsicherheiten bezüglich der spezifischen Rolle der Pflegenden in der Rehabilitation von Hirnschlagpatientinnen und -patienten hin. Es existieren zwei unterschiedliche Begrifflichkeiten für die Rolle der Pflegenden, keine davon bezieht sich auf spezifische Rehabilitationsziele oder Patientenergebnisse. Ein anfänglicher theoretischer Beitrag der Rolle der Pflege in der Genesung vom Hirnschlag wird als Struktur unterbreitet, um die therapeutischen Aspekte der Pflege im Koordinieren, Erhalten und Üben zu vereinen. Bestehende Literatur untermauert diesen Beitrag. Weitere Forschung ist jedoch notwendig, um den spezifischen Inhalt und Fokus der Pflege in der Genesung bei Hirnschlag zu entwickeln.

The Effect of Calcium and Magnesium on Rabbit Blood Platelet Aggregation in Vitro

1964 ◽  
Vol 12 (01) ◽  
pp. 179-200 ◽  
Author(s):  
Torstein Hovig
Keyword(s):  
Platelet Aggregation ◽  
Cation Exchange ◽  
Calcium Concentration ◽  
Blood Platelets ◽  
Blood Platelet ◽  
Rabbit Blood ◽  
Calcium And Magnesium ◽  
Induced Aggregation ◽  
Blood Platelet Aggregation

SummaryThe effect of calcium and magnesium on the aggregation of rabbit blood platelets in vitro was studied, with the following results:1. Platelet aggregation induced by ADP or collagen could be prevented by EGTA or EDTA. The aggregating effect was restored by recalcification. The effect was also restored by addition of magnesium in EDTA-PRP, but not in EGTA-PRP unless a surplus of calcium was present.2. Calcium remained in concentrations of the order of 0.15–0.25 mM after dialysis or cation exchange of plasma. Aggregation of washed platelets resuspended in such plasma could not be produced with ADP or collagen, unless the calcium concentration was increased or that magnesium was added.3. The adhesiveness of blood platelets to collagen was reduced in EGTA-PRP and EDTA-PRP. Release of ADP from platelets influenced by collagen could not be demonstrated either in EGTA-PRP (presence of magnesium) or in EDTA-PRP.4. It is concluded that calcium is a necessary factor both for the reaction leading to release of ADP and for the the aggregation produced by ADP.5. Thrombin induced aggregation of washed platelets suspended in tris-buffered saline in the presence of calcium. No effect of magnesium could be observed unless small quantities of calcium were present.

Hydrous oxides and their cation-exchange properties

1965 ◽  
Vol 15 (10) ◽  
pp. 445-448 ◽  
Author(s):  
C. Heitner-Wirguin ◽  
A. Albu-Yaron
Keyword(s):  
Cation Exchange ◽  
Hydrous Oxides ◽  
Exchange Properties

PORTFOLIOS ASSESSMENT AS A METHOD OF ASSESSMENT OF LANGUAGE IN ESL CLASSROOM CONTEXT

2015 ◽  
Vol 8 (2) ◽  
pp. 61
Author(s):  
Juella Rumiris
Keyword(s):  
Assessment Tool ◽  
Theoretical Perspective ◽  
Curriculum Planning ◽  
Classroom Context ◽  
Learning Program ◽  
English As Second Language ◽  
English As Foreign Language ◽  
Learning Improvement ◽  
Method Of Assessment ◽  
Teacher's Perspective

The use of portfolios as an assessment tool probably is unlikely common in Asian countries. Portfolios is commonly considered as a compilation of students’ work for a certain period of time. In fact, the portfolios may show the originality of and the nature of students’ learning improvement. In this paper, the writer will discuss portfolios as a method of assessment in English as Second Language or English as Foreign Language (ESL/EFL) classroom context from teacher’s perspective. This paper is designed with this format order: firstly to explain about the degree of portfolios method to assess content, skills and knowledge in the teach-ing-learning program in the ESL/EFL context, to correlate portfolios system to model of curriculum planning and policy context. Secondly, to discuss the strengths and weaknesses of portfolios method from a theoretical perspective, and analyse the validity, reliability, and fairness. Thirdly, to specify the association of portfolios method and the types of assessment and the correlation of portfolios method with assessment for learning. Fourthly, to evaluate the degree of portfolios method of assessment promoting learning of the knowledge, skills, and abilities related to my teaching experience.Keywords : Portfolios, Assessment, Curriculum, Learning, Knowledge, Skills.

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