scholarly journals A Novel Multitexton Histogram to Identify the Human Parasite Eggs Based on Textons of Irregular Shape

Author(s):  
Roxana Flores-Quispe ◽  
Yuber Velazco-Paredes
2019 ◽  
Vol 10 (6) ◽  
pp. 31-47
Author(s):  
Roxana Flores-Quispe ◽  
Yuber Velazco-Paredes

Palaeobotany ◽  
2012 ◽  
Vol 3 ◽  
pp. 5-11
Author(s):  
A. V. Gomankov ◽  
V. F. Tarasevich

Dispersed bisaccate pollen grains of Scutasporites nanuki were studied by means of LM, SEM and TEM. Sacci ultrastructure of these pollen grains was rather peculiar. Sacci were like a thin fi lmy fringe attached to the central body near the equator. They were fi lled with sporopollenin elements of irregular shape and various dimensions with equally various cavities between them. Such an ultrastructure is called as spongy. The morphology and ultrastructure of S. nanuki is discussed in the context of the evolution of early conifers.


2008 ◽  
Vol 35 (3) ◽  
pp. 728-738 ◽  
Author(s):  
Esin Dogantekin ◽  
Mustafa Yilmaz ◽  
Akif Dogantekin ◽  
Engin Avci ◽  
Abdulkadir Sengur

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiangli Wang ◽  
Yong Fu ◽  
Wandy L. Beatty ◽  
Meisheng Ma ◽  
Alan Brown ◽  
...  

2005 ◽  
Vol 41 (1) ◽  
pp. 154-161 ◽  
Author(s):  
Vishal Trivedi ◽  
Kumkum Srivastava ◽  
Sunil K. Puri ◽  
Prakas R. Maulik ◽  
Uday Bandyopadhyay

Parasitology ◽  
2017 ◽  
Vol 144 (7) ◽  
pp. 954-964 ◽  
Author(s):  
NELE A. M. BOON ◽  
WOUTER FANNES ◽  
SARA ROMBOUTS ◽  
KATJA POLMAN ◽  
FILIP A. M. VOLCKAERT ◽  
...  

SUMMARYHybrid parasites may have an increased transmission potential and higher virulence compared to their parental species. Consequently, hybrid detection is critical for disease control. Previous crossing experiments showed that hybrid schistosome eggs have distinct morphotypes. We therefore compared the performance of egg morphology with molecular markers with regard to detecting hybridization in schistosomes. We studied the morphology of 303 terminal-spined eggs, originating from 19 individuals inhabiting a hybrid zone with natural crosses between the human parasite Schistosoma haematobium and the livestock parasite Schistosoma bovis in Senegal. The egg sizes showed a high variability and ranged between 92·4 and 176·4 µm in length and between 35·7 and 93·0 µm in width. No distinct morphotypes were found and all eggs resembled, to varying extent, the typical S. haematobium egg type. However, molecular analyses on the same eggs clearly showed the presence of two distinct partial mitochondrial cox1 profiles, namely S. bovis and S. haematobium, and only a single nuclear ITS rDNA profile (S. haematobium). Therefore, in these particular crosses, egg morphology appears not a good indicator of hybrid ancestry. We conclude by discussing strengths and limitations of molecular methods to detect hybrids in the context of high-throughput screening of field samples.


1906 ◽  
Vol 26 ◽  
pp. 32-45
Author(s):  
J. G. Milne
Keyword(s):  

During the excavations of Messrs. Hogarth Grenfell and Hunt for the Egypt Exploration Fund in the winter of 1895–6 on the site of Karanis (Kom Ushim) in the Fayum, a considerable number of clay-sealings were found, mainly in the cellars of the Roman houses. These were recently put in my hands for investigation and offer some interesting material.The sealings have evidently come from various kinds of articles: in many instances the clay is too much broken for any determination of the shape which it had taken to be possible; but among the better preserved pieces are examples from the mouths of bottles, some of which have been squeezed down into the neck like a cork, others placed over a linen covering, sometimes tied down with cord: others are from the flat sides of wooden boxes, often showing the marks of cord: others again from parcels of irregular shape, in some cases seemingly wrapped in papyrus. The common points of all are that they consist of lumps of Nile-mud, and that they have been impressed, while the clay was damp, with signets, which were presumably those of the merchants who forwarded the goods upon which the sealings were placed.


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