The Histochemistry of the Male Germ-cells of the Nematode Porrocaecum angusticolle, a Parasite in the Vulture

1961 ◽  
Vol s3-102 (57) ◽  
pp. 39-50
Author(s):  
VISHWA NATH ◽  
BRIJ L. GUPTA ◽  
DEVENDAR M. KOCHHAR
Keyword(s):  
Germ Cells ◽  
Close Association ◽  
Posterior Region ◽  
Anterior Region ◽  
Male Germ Cells ◽  
Golgi Bodies ◽  
Late Spermatid ◽  
Single Cone

The cytoplasm of the male germ-cells of Porrocaecum angusticolle contains (1) phospholipid granules, (2) ‘refringent bodies’ consisting of ribonucleoproteins at first, but some masked lipids as well in the late spermatid, (3) mitochondria of the usual lipoprotein nature. The refringent bodies arise in the spermatocytes in close association with the phospholipid granules (‘Golgi bodies’) by the aggregation of cytoplasmic basiphil material. In the spermatids the refringent bodies gradually fuse to form a single cone-like structure which occupies the narrow posterior region of the spermatozoon. This cone-like structure, judging from its origin in close association with the ‘Golgi bodies’ (acroblasts), is the homologue of the acrosome of a normal flagellate sperm; but it is completely devoid of polysaccharides and seems unable to function as an acrosome, since it occupies a position posterior to the nucleus in the spermatozoon. On the contrary, some polysaccharides have been demonstrated by the authors in the broad anterior region of the spermatozoon, which may be functioning as an acrosome.

Golgi Bodies in the Male Germ-Cells of Vaginula maculata

Nature ◽  
1953 ◽  
Vol 172 (4380) ◽  
pp. 690-690 ◽  
Author(s):  
JOHN R. BAKER
Keyword(s):  
Germ Cells ◽  
Male Germ Cells ◽  
Golgi Bodies

Golgi Bodies in the Male Germ-Cells of Vaginula maculata

Nature ◽  
1953 ◽  
Vol 172 (4380) ◽  
pp. 689-690 ◽  
Author(s):  
M. D. L. SRIVASTAVA
Keyword(s):  
Germ Cells ◽  
Male Germ Cells ◽  
Golgi Bodies

scholarly journals NANOS2 suppresses the cell cycle by repressing mTORC1 activators in embryonic male germ cells

iScience ◽  
2021 ◽  
pp. 102890
Author(s):  
Ryuki Shimada ◽  
Hiroko Koike ◽  
Takamasa Hirano ◽  
Yuzuru Kato ◽  
Yumiko Saga
Keyword(s):  
Cell Cycle ◽  
Germ Cells ◽  
Male Germ Cells

scholarly journals ELECTRON MICROSCOPE STUDIES ON THE DICTYOSOMES AND ACROBLASTS IN THE MALE GERM CELLS OF THE CRICKET

1956 ◽  
Vol 2 (4) ◽  
pp. 123-128 ◽  
Author(s):  
H. W. Beams ◽  
T. N. Tahmisian ◽  
R. L. Devine ◽  
Everett Anderson
Keyword(s):  
Electron Microscope ◽  
Golgi Apparatus ◽  
Electron Micrographs ◽  
Germ Cells ◽  
Light Microscope ◽  
Golgi Body ◽  
Duplex Structure ◽  
Male Germ Cells ◽  
Secondary Spermatocyte ◽  
A Chain

The dictyosome (Golgi body) in the secondary spermatocyte of the cricket appears in electron micrographs as a duplex structure composed of (a) a group of parallel double-membraned lamellae and (b) a group of associated vacuoles arranged along the compact lamellae in a chain-like fashion. This arrangement of ultramicroscopic structure for the dictyosomes is strikingly comparable to that described for the Golgi apparatus of vertebrates. Accordingly, the two are considered homologous structures. Associated with the duplex structure of the dictyosomes is a differentiated region composed of small vacuoles. This is thought to represent the pro-acrosome region described in light microscope preparations. In the spermatid the dictyosomes fuse, giving rise to the acroblast. Like the dictyosomes, the acroblasts are made up of double-membraned lamellae and associated vacuoles. In addition, a differentiated acrosome region is present which, in some preparations, may display the acrosome vacuole and granule. Both the dictyosomes and acroblasts are distinct from mitochondria.

scholarly journals Male germ cells and photoreceptors, both dependent on close cell–cell interactions, degenerate upon ClC-2 Cl− channel disruption

2001 ◽  
Vol 20 (6) ◽  
pp. 1289-1299 ◽  
Author(s):  
Michael R. Bösl ◽  
Valentin Stein ◽  
Christian Hübner ◽  
Anselm A. Zdebik ◽  
Sven-Eric Jordt ◽  
...  
Keyword(s):  
Germ Cells ◽  
Cell Interactions ◽  
Male Germ Cells ◽  
Cl Channel ◽  
Cell Cell

scholarly journals The 28 + 28 day design is an effective sampling time for analyzing mutant frequencies in rapidly proliferating tissues of MutaMouse animals

2021 ◽  
Vol 95 (3) ◽  
pp. 1103-1116
Author(s):  
Francesco Marchetti ◽  
Gu Zhou ◽  
Danielle LeBlanc ◽  
Paul A. White ◽  
Andrew Williams ◽  
...  
Keyword(s):  
Germ Cells ◽  
False Negative ◽  
Sampling Time ◽  
Male Germ Cells ◽  
Negative Results ◽  
False Negative Results ◽  
Detection Of Mutations ◽  
The Impact ◽  
Sampling Times

AbstractThe Organisation for Economic Co-Operation and Development Test Guideline 488 (TG 488) uses transgenic rodent models to generate in vivo mutagenesis data for regulatory submission. The recommended design in TG 488, 28 consecutive daily exposures with tissue sampling three days later (28 + 3d), is optimized for rapidly proliferating tissues such as bone marrow (BM). A sampling time of 28 days (28 + 28d) is considered more appropriate for slowly proliferating tissues (e.g., liver) and male germ cells. We evaluated the impact of the sampling time on mutant frequencies (MF) in the BM of MutaMouse males exposed for 28 days to benzo[a]pyrene (BaP), procarbazine (PRC), isopropyl methanesulfonate (iPMS), or triethylenemelamine (TEM) in dose–response studies. BM samples were collected + 3d, + 28d, + 42d or + 70d post exposure and MF quantified using the lacZ assay. All chemicals significantly increased MF with maximum fold increases at 28 + 3d of 162.9, 6.6, 4.7 and 2.8 for BaP, PRC, iPMS and TEM, respectively. MF were relatively stable over the time period investigated, although they were significantly increased only at 28 + 3d and 28 + 28d for TEM. Benchmark dose (BMD) modelling generated overlapping BMD confidence intervals among the four sampling times for each chemical. These results demonstrate that the sampling time does not affect the detection of mutations for strong mutagens. However, for mutagens that produce small increases in MF, sampling times greater than 28 days may produce false-negative results. Thus, the 28 + 28d protocol represents a unifying protocol for simultaneously assessing mutations in rapidly and slowly proliferating somatic tissues and male germ cells.

Sign in / Sign up

Export Citation Format

Share Document