Genetic and imaging study of a case with multiple malformations: limb body wall complex

The Limb-Wall Complex is a rare and sporadic congenital anomaly characterized by multiple craniofacial and thoracoabdominal malformations as well as involvement of the spine and lower extremities. The etiology is unknown and the chromosomal study is normal, however, it is related to an alteration in the formation of the umbilical cord (short umbilical cord), abdominal placental insertion and persistence of the extraembryonic coelom. This condition causes intracavitary organs to be exposed and adhered to the placenta and consequently also attached to the mother’s uterus. The diagnosis can be made from the first trimester of gestation with a nuchal translucency ultrasound in order to detect this pathology in time and to be able to offer good genetic counseling to the parents, since the prognosis is not favorable

Chromosomal study of Xanthomonas atrovariens 'Variegatum Monostrum' a member of Araceae

not available Jahangirnagar University J. Biol. Sci. 9(1 & 2): 133-137, 2020 (June & December)

CHROMOSOMAL STUDY OF TWO ARANEAE: ARANEIDAE SPIDERS FROM AKOLA MAHARASHTRA

Spiders (Araneae) appear to be the best studied order,of the class Arachnida concerning Chromosomal aspects.They exhibit great diversity in diploid chromosome numbers.Compared with others Araneidae spiders,chromosomes of the Araneae: spider are less studied. In this study, chromosomes of two Araneidae spiders Cyrtophora citricola (Forskål, 1775) and Neoscona theisi (Walckenaer, 1841) were observed and studied based on the samples collected from Akola region. The chromosome diploid number and the sex chromosomal system in both the spider species found 2n=(22+X X X X ) and 2n=(22+X X ) respectively.Both the spider species shows telocentric chromosomes.

A new species of Synotaxus and the first chromosomal study on Synotaxidae, presenting a rare XY sex chromosome system in spiders (Araneae, Araneoidea)

Studies on spider chromosomes are very scarce, with 44 spider families without any cytogenetically analyzed species. Nevertheless, chromosomal characteristics can be useful for species delimitation, such as the sex chromosome system (SCS), which is particularly diverse in spiders. In this study, we describe Synotaxus jaraguari n. sp., based on male and female specimens from midwestern Brazil. This species has a distinctive “horn” in the male ocular area and seems related to a group of species that includes Synotaxus monocerus (Caporiacco, 1947), S. itabaiana Santos & Rheims, 2005 and S. siolli Santos & Rheims, 2005. We also present the first karyotype study on Synotaxidae. The mitotic and meiotic cells of S. jaraguari n. sp. revealed 2n♂ = 22 + XY and 2n♀ = 22 + XX telocentric chromosomes. This is the ninth spider species with a XY/XX SCS, which is extremely rare in the group.

Cytotoxic effect of naphthalene on root meristem of Allium cepa L.

The cytotoxic effect of naphthalene was assessed in the root meristem of Allium cepa L. - a model plant for chromosomal study. The newly emerging roots were treated with 10%, 30%, 50%, 75% and 100% naphthalene solution (v/v). Each treatment was kept for 6, 12, 18, 24 and 48 hours respectively to study their cytotoxic effect. Naphthalene exerted depressive effects on mitosis, including reduced mitotic indices and accumulation of abnormal mitotic phases. The mitotic index showed decreasing tendency with parallel increase in naphthalene concentrations. Sticky metaphase, C- metaphase, diagonal metaphase, nuclear disintegration were found to be in higher frequency in all treatments. Both duration and concentration of the treatment influenced the cell division.