Evidence map›Paper›PMID 21501476›Full record

ArticleMalaria journal2011

Comparison of the in vitro invasive capabilities of Plasmodium falciparum schizonts isolated by Percoll gradient or using magnetic based separation.

Carmenza Spadafora, Lucia Gerena, Karen M Kopydlowski

Open access · goldAbstract readComparative Study
In one paragraph

Article in Malaria journal, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed
2.8field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

12 citing papers in PubMed, 23 citations in OpenAlex.

  1. Article
  2. Separation of intrinsically magnetic cells using magnetic filters.Separation and purification technology · 2025
    Article
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  5. Article
  6. Article
  7. Malarial hemozoin: from target to tool.Biochimica et biophysica acta · 2014
    Review
  8. Article
  9. Article
  10. Article
  11. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 1 institution in 1 country.

Carmenza SpadaforaCellular Injury Department, Division of Military Casualty Research, Walter Reed Army Institute of Research, 503 Robert Grant Ave,, Silver Spring, MD 20902, USA. cspadafora@indicasat.org.pa
Lucia Gerena
Karen M Kopydlowski
Walter Reed Army Institute of Research · US

Funding

Pediatric malaria research fellowship training programD43TW006239 · FIC · WALTER REED ARMY INSTITUTE OF RESEARCH · PI STOUTE, JOSE ANTONIO · 2003 to 2006
$398k
FIC NIH HHS 1 D43 TW06239
6 · The paper itself

Abstract

backgroundPercoll gradient centrifugation is often used for synchronization, enrichment, or isolation of a particular stage of Plasmodium falciparum. However, Percoll, a hyperosmotic agent, may have harmful effects on the parasites. Magnetic bead column (MBC) separation has been used as an alternative. This is a report of a head-to-head comparison of the in vitro invasive capabilities of parasites isolated by either of the two methods.

methodsThe P. falciparum laboratory strain isolate 7G8 was grown in vitro using standard procedures and synchronized using 5% sorbitol. On separate days when the schizont parasitaemia was >1%, the culture was split and half was processed by Percoll gradient centrifugation and the other half by magnetic bead column separation. Both processed parasites were placed back in culture and allowed to invade new uninfected erythrocytes.

resultsIn 10 paired assays, the mean efficiency of invasion of 7G8 parasites treated by Percoll gradient centrifugation was 35.8% that of those treated by magnetic bead column separation (95% CI, p = 0.00067) A paired t test with two tails was used for these comparisons.

conclusionsIn this comparison, magnetic bead column separation of 7G8 schizonts resulted in higher viability and efficiency of invasion than utilizing Percoll gradient centrifugation.

Indexed as

Centrifugation, Density GradientErythrocytesHumansImmunomagnetic SeparationMalaria, FalciparumParasitemiaPlasmodium falciparumPovidoneSchizontsSilicon DioxidePercollPovidoneSilicon Dioxide

Identifiers

PMID21501476
PMCPMC3100259
OpenAlexW2100344742

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.