A study of heterochromatin in Drosophila nasuta by the 5-bromodeoxyuridine-giemsa staining technique

Chromosoma ◽  
1979 ◽  
Vol 72 (2) ◽  
pp. 249-255 ◽  
Author(s):  
S. C. Lakhotia ◽  
J. K. Roy ◽  
Mahesh Kumar
1973 ◽  
Vol 15 (3) ◽  
pp. 619-624 ◽  
Author(s):  
S. M. Stack ◽  
C. R. Clarke

We have used a Giemsa staining technique, which is thought to indicate the site of repetitive DNA and constitutive heterochromatin, to stain the telomeres of Allium cepa chromosomes differentially. These differentially stained telomeres are equally visible throughout the mitotic cycle including interphase. We observed fusions of telomeres that included both homologous and non-homologous associations. Evidence that repetitive DNA plays a role in chromosome pairing is presented.


2016 ◽  
pp. 26-32
Author(s):  
Juliana Namutundu ◽  
Nsobya Samuel Lubwama ◽  
Yeka Adoke ◽  
Chrispus Mayora ◽  
Sebastian Olikira Baine

Background: World Health Organization and Ministry of Health (Uganda) recommend use of microscopy for parasitological confirmation of malaria. Microscopy involves either Giemsa or Field’s staining techniques. Ministry of Health prefers and recommends use of Giemsa staining technique but most health facilities still use Field’s staining technique. The objective of this study was to compare the cost-effectiveness of Giemsa and Field’s staining techniques in order to inform malaria diagnosis policy and practice in Uganda. Methods: This was a cross sectional cost effectiveness analysis from the provider’s perspective covering the period between April 25, 2014 and June 15, 2014. The study involved 243 children below five years of age presenting at Acute Care Unit laboratory for malaria test before admission. Giemsa and Field’s staining techniques were compared with Polymerase Chain Reaction as the gold standard. Decision tree analytic model in TreeAge was used for the cost effectiveness analysis. Results : Field’s and Giemsa staining techniques cost US $ 0.030 and US $ 0.769 respectively. Correctly diagnosed cases were 227 and 230 for Field’s and Giemsa staining techniques respectively. The proportion of correctly diagnosed cases was 93.4% for Field’s and 94.7% for Giemsa. Incremental cost effectiveness ratio was 0.35 US $ per additional correctly diagnosed case. Conclusion: Field’s staining technique was more cost effective than Giemsa staining technique; provided a higher number of correctly diagnosed cases at a lower cost than Giemsa staining technique. Field’s staining technique is recommended as staining technique for malaria diagnosis at the Acute Care Unit of Mulago National Referral Hospital. This implies that even with introduction of more superior staining techniques for laboratory diagnosis of malaria, Field staining technique is still a cost effective technique to be used in resource limited settings with high malaria burden like Uganda and Africa at large.


2017 ◽  
pp. 26-31
Author(s):  
Abebaw Tegegn Damtie ◽  
Assen Muhe Getahun

Background: World Health Organization and Ministry of Health (Uganda) recommend use of microscopy for parasitological confirmation of malaria. Microscopy involves either Giemsa or Fields staining techniques. Ministry of Health prefers and recommends use of Giemsa staining technique but most health facilities still use Fields staining technique. The objective of this study was to compare the cost-effectiveness of Giemsa and Fields staining techniques in order to inform malaria diagnosis policy and practice in Uganda. Methods: This was a cross sectional cost effectiveness analysis from the providers perspective covering the period between April 25, 2014 and June 15, 2014. The study involved 243 children below five years of age presenting at Acute Care Unit laboratory for malaria test before admission. Giemsa and Fields staining techniques were compared with Polymerase Chain Reaction as the gold standard. Decision tree analytic model in TreeAge was used for the cost effectiveness analysis. Results: Fields and Giemsa staining techniques cost US $ 0.030 and US $ 0.769 respectively. Correctly diagnosed cases were 227 and 230 for Fields and Giemsa staining techniques respectively. The proportion of correctly diagnosed cases was 93.4% for Fields and 94.7% for Giemsa. Incremental cost effectiveness ratio was 0.35 US $ per additional correctly diagnosed case. Conclusion: Fields staining technique was more cost effective than Giemsa staining technique; provided a higher number of correctly diagnosed cases at a lower cost than Giemsa staining technique. Fields staining technique is recommended as staining technique for malaria diagnosis at the Acute Care Unit of Mulago National Referral Hospital. This implies that even with introduction of more superior staining techniques for laboratory diagnosis of malaria, Field staining technique is still a cost effective technique to be used in resource limited settings with high malaria burden like Uganda and Africa at large.


1977 ◽  
Vol 7 (2) ◽  
pp. 435-437 ◽  
Author(s):  
David F. Karnosky ◽  
Edson C. Setliff

A giemsa staining technique for rapidly and simply examining tree chromosomes is presented. Somatic chromosomes of two hardwood and two coniferous tree species were successfully stained using the technique.


1973 ◽  
Vol 15 (2) ◽  
pp. 367-369 ◽  
Author(s):  
S. M. Stack ◽  
C. R. Clarke

By using a modified Giemsa staining technique, which is thought to indicate the presence of repetitive DNA, pericentric heterochromatin was stained in the chromosomes of two plant species, Plantago ovata and Allium cepa. Apparently in plants, just as in animals, there is a tendency for constitutive heterochromatin and repetitive DNA to associate with chromosome centromeres.


1975 ◽  
Vol 17 (2) ◽  
pp. 269-273 ◽  
Author(s):  
Diane E. Godin ◽  
Stephen M. Stack

A Giemsa staining technique that is thought to indicate the site of constitutive heterochromatin and repetitive DNA was used to stain the telomeres of Secale cereale (rye) chromosomes. Heterochromatic telomeres are visible throughout the mitotic cycle, and fusions and connections were observed between telomeres during prophase and metaphase. These observations are consistent with an earlier report of heterochromatic connections between telomeres of Allium cepa chromosomes and support the hypothesis that constitutive heterochromatin and repetitive DNA may be involved in chromosome associations.


2021 ◽  
Vol 1 (1) ◽  
pp. 001-005
Author(s):  
Ibeh Nnanna Isaiah ◽  
Moses-Otutu Ifueko Mercy ◽  
Omorodion Nosa Terry

Many a times the use of rapid diagnostic tests for blood borne parasites like trypanosomiasis and Babesiosis is increasingly being used, but the gold standard for its detection is still the use of microscopy both as reference and confirmatory diagnosis. To determine the effectiveness of the adjusted stock giemsa staining technique over the conventional methods. Venous Blood samples were collected from 10 dogs in EDTA and then used for the simultaneous preparation of two thin and thick smear slides, one stained according to Giemsa 1:20 dilution for 30 mins while the other was stained using the Stock Solution for 30seconds the diluted with buffered saline for 20seconds and rinsed. Fixation of the thin smear was done in a covered staining jar containing anhydrous methanol for 1 to 2 min, after which the slides were air-dried. From the result obtained from 10 dogs blood samples gotten from the veterinary clinic, the adjusted giemsa staining technique showed a positive differentiation when compared to the 1:20 dilution, a total of 7 blood samples tested positive for blood borne parasites, Trypanosoma evansi, Babesiosis cani and Heart worm. The highest percentage occurrence was T.evansi (40%), Babesiosis cani(20%) and Heart worm (10%).The adjusted Giemsa staining technique serves as a fast, easy and less complex alternative to the 1:20 dilution, where the solution has to be diluted from the stock solution and then stained, although the only disadvantage to this technique would be easy contamination of the stock solution, but the advantages here is that it saves time, quicker result output and better differentiation microscopically.


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