Mitotic Pattern in the Chick Pronephric Duct

Development ◽  
1959 ◽  
Vol 7 (3) ◽  
pp. 275-280
Author(s):  
Jane Overton
Keyword(s):  
Histological Study ◽  
Colchicine Treatment ◽  
Pronephric Duct ◽  
Normal Diameter ◽  
Posterior Elongation

By means of a variety of ingenious experiments it has been shown that the pronephric duct originates anteriorly and grows caudally to join the cloaca (for review, see Burns, 1955). It has been concluded on the basis of histological study (Lillie, 1919), and from operative experiments in which the pronephric duct path was blocked by grafts (Waddington, 1938), that in the chick the pronephric duct extends posteriorly by proliferation of its own cells. In the present study, the proliferative pattern in the outgrowing duct of the chick has been examined in normal and in colchicine-treated embryos. Results indicate that proliferation is particularly marked towards the posterior duct tip. It was also noted that tensions of the blastoderm (see Spratt, 1956) which are disrupted by colchicine treatment appear to play some part in maintenance of normal diameter and posterior elongation of the duct.

Histological Study of Human Thyroid Gland Relative Proportion of Parenchyma and Stroma in Thyroid Glands of Bangladeshi People

2013 ◽  
Vol 1 (2) ◽  
pp. 17-20
Author(s):  
Md Enayet Ullah ◽  
Hasna Hena ◽  
Rubina Qasim
Keyword(s):  
Thyroid Gland ◽  
Histological Study ◽  
Relative Proportion ◽  
Age Groups ◽  
Human Thyroid ◽  
Structural Units ◽  
Thyroid Glands ◽  
Group A ◽  
Group B ◽  
Connective Tissue Sheath

Deep cervical fascia forms a connective tissue sheath around the thyroid gland. Delicate trabeculae and septa penetrate the gland indistinctly dividing the gland into lobes and lobules which in turn composed of follicles.1,2,3 These follicles are structural units of thyroid gland which varies greatly in size and shape.4 The number of follicles varies in different age groups. The study was carried out to see the percentage of area occupied by follicles in the stained section of thyroid glands in different age groups. The collected samples were grouped as A (3.5 – 20yrs), B (21- 40yrs) & C (41 – 78yrs). Percentage of area occupied by follicles was (58.55±10.72) in group A, (63.79±12.35) in group B + (63.39±8.29) in group C.DOI: http://dx.doi.org/10.3329/updcj.v1i2.13981 Update Dent. Coll. j. 2011: 1(2): 17-20

ANATOMICAL AND HISTOLOGICAL STUDY OF CEREBRAL IN STURNUS VULGARIS

2013 ◽  
Vol 12 (2) ◽  
pp. 221-227 ◽  
Author(s):  
A Ali ◽  
Sawsan A ◽  
Faleha. H aziz ◽  
Nathum .A.Shehan ◽  
Samira .A.Dhage
Keyword(s):  
Histological Study ◽  
Sturnus Vulgaris

ISOLEMENT ET QUELQUES CARACTERISTIQUES D'UNE GONADOTROPHINE URINAIRE DE MÉNOPAUSE HOMOGÈNE A L'ELECTROPHORÈSE

1960 ◽  
Vol XXXV (II) ◽  
pp. 225-234 ◽  
Author(s):  
R. Bourrillon ◽  
R. Got ◽  
R. Marcy
Keyword(s):  
Sialic Acid ◽  
Histological Study ◽  
Active Material ◽  
Biologically Active ◽  
New Method ◽  
Female Rats ◽  
Mouse Uterus ◽  
Highly Active ◽  
Zone Electrophoresis ◽  
Human Menopausal Gonadotrophin

ABSTRACT A new method for preparation of Human Menopausal Gonadotrophin involves successively alcoholic precipitation, kaolin adsorption and chromatography on ion exchangers. A highly active material is obtained which corresponds to 1 mg per litre of urine and has an activity of 1 mouse uterus unit at a dose of 0.003 mg. This gonadotrophin possesses both follicle stimulating and luteinizing activities in hypophysectomized female rats, by histological study. It contains 13 % hexose, 10% hexosamine and 8.5 % sialic acid. A further purification, by zone electrophoresis on starch, gives a final product, biologically active at 0.001 mg, which behaves as an homogenous substance in free electrophoresis with mobility −4.76 × 10−5 at pH 8.6.

Effects of Periosteum Wrapped Around Tendon in a Bone Tunnel: A Biomechanical and Histological Study in Rabbits

2000 ◽  
Vol 28 (1-2) ◽  
pp. 115-118 ◽  
Author(s):  
Kozo Ohtera ◽  
Yasuharu Yamada ◽  
Mitsuhiro Aoki ◽  
Tetsuto Sasaki ◽  
Ken-ichi Yamakoshi
Keyword(s):  
Histological Study ◽  
Bone Tunnel

Histological Study on the Effects of Dental Calculus to Cementum

1978 ◽  
Vol 20 (4) ◽  
pp. 669-689
Author(s):  
Shohei HIGASHI ◽  
Tetsuo KODAKA ◽  
Miyuki KOBAYASHI ◽  
Tetsuko IMURA ◽  
Hiroaki NAKAGAWA
Keyword(s):  
Histological Study ◽  
Dental Calculus
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