Search results for " MORPHOLOGY"

The role of elongational flow in morphology modification of Polyethylene/OMMT nanocomposite system

2011

Extensive nuclear gyration and pervasive non-genic transcription during primordial germ cell development in zebrafish.

2020

ABSTRACT Primordial germ cells (PGCs) are the precursors of germ cells, which migrate to the genital ridge during early development. Relatively little is known about PGCs after their migration. We studied this post-migratory stage using microscopy and sequencing techniques, and found that many PGC-specific genes, including genes known to induce PGC fate in the mouse, are only activated several days after migration. At this same time point, PGC nuclei become extremely gyrated, displaying general broad opening of chromatin and high levels of intergenic transcription. This is accompanied by changes in nuage morphology, expression of large loci (PGC-expressed non-coding RNA loci, PERLs) that ar…

Standardization of sampling and staining methods for the morphometric evaluation of sperm heads in the Cynomolgus monkey (Macaca fascicularis) using …

2005

Automated sperm morphology analysis (ASMA) technology has improved the assessment of sperm morphology, but the results depend on the use of adequate and standardized procedures. In this study the Sperm-Class Analyzer® (SCA) ASMA system was used to assess sperm head morphometry in the Cynomolgus monkey and to evaluate the influence of sample size, intraslide variation, and the use of three staining techniques on the accuracy of image processing and sperm head morphometry. Haematoxylin is the staining technique of choice for Cynomolgus spermatozoa, as optimum contrast of sperm heads with the surrounding background allows efficient segmentation, i.e. sperm head boundary detection, making the i…

Use of the Sperm-Class Analyser® for objective assessment of human sperm morphology

2003

The Sperm-Class Analyser was validated for assessing morphometric parameters of the head and midpiece of unwashed and washed human ejaculated spermatozoa from volunteers providing a wide range of semen quality. A higher proportion of sperm could be assessed (86% fresh semen and 75% washed sperm) if Hemacolor staining was used rather than DiffQuik (80 and 73%) or Papanicolaou (78 and 68%). Different stains employed different fixatives and the area, length, width and perimeter of the sperm head was significantly larger for washed sperm stained by Hemacolor and DiffQuik. Acrosomal area ranged from 48 to 51% of the sperm head area and this percentage was larger for washed sperm stained with Dif…

Histologic analysis of specimens from laparoscopic endometrioma excision performed by different surgeons: does the surgeon matter?

2011

Objective To evaluate whether the amount of ovarian tissue inadvertently removed along with the endometrioma cyst wall at laparoscopy differs in relation to the operating surgeon's level of expertise. Design Multicenter, prospective trial. Setting Four tertiary care university hospitals. Patient(s) Fifty patients, aged 25 to 40 years, with monolateral ovarian endometriomas who underwent laparoscopic excision. Intervention(s) Operation with the stripping technique by surgeons with specific expertise in endometriosis surgery in four centers (groups A, B, C, and D) and by residents with average training in laparoscopic surgery (group E). Main Outcome Measure(s) Histologic examination for the e…

The Greek Verb. Morphology, Syntax, Semantics. Proceedings of the 8th International Meeting on Greek Linguistics. Agrigento, October 1-3, 2009

2014

Despite the difficulties of reconstructing the grammar of a dead language, studying Ancient Greek offers new insights for linguistic theory. The morphological complexity of the Greek verb with its highly intricate inflectional system provide a valuable basis for an in-depth-analysis of the mechanisms which regulate the functioning of a language. Studies on the Ancient Greek verb have also contributed significantly to the reconstruction of the Indo-European language since the early history of Linguistics in the nineteenth century. The conservative features preserved in the oldest stages of Greek allow us to rely on a solid basis to which every linguist must refer in investigating a model of …

Effects of morphology on watershed actual evapotranspiration estimation by means of SEBAL model

2008

Mechanics of invagination and folding: Hybridized instabilities when one soft tissue grows on another

2015

We address the folding induced by differential growth in soft layered solids via an elementary model that consists of a soft growing neo-Hookean elastic layer adhered to a deep elastic substrate. As the layer/substrate modulus ratio is varied from above unity towards zero we find a first transition from supercritical smooth folding followed by cusping of the valleys to direct subcritical cusped folding, then another to supercritical cusped folding. Beyond threshold the high amplitude fold spacing converges to about four layer thicknesses for many modulus ratios. In three dimensions the instability gives rise to a wide variety of morphologies, including almost degenerate zigzag and triple-ju…

Folktale, Morphology

2020

Vladimir Yakovlevich Propp was born in St. Petersburg on April 17, 1895 and died in Leningrad on August 22, 1970. Despite remaining in the same city, the events of history caused those places, over the course of (his) time, to take on a whole new meaning and a very different flavor. Of course, to a folklorist like Propp, used to reflecting on the distance of millennia, those seventy-five years will have been nothing. Though the fact remains that the monumental epochal shifts he witnessed (the Russian Revolution and the long cultural and political Soviet regime that followed) feature heavily in his brilliant work.

A three-dimensional fractal approach of urban morphology, fomalisation and application

1999

International audience