scholarly journals Minimal size reduction in planarians through successive regenerations

1911 ◽  
Vol 22 (4) ◽  
pp. 989-992 ◽  
Author(s):  
S. J. Holmes
Keyword(s):  
Size Reduction ◽  
Minimal Size

scholarly journals Human Spermatogenesis Tolerates Massive Size Reduction of the Pseudoautosomal Region

2020 ◽  
Vol 12 (11) ◽  
pp. 1961-1964
Author(s):  
Maki Fukami ◽  
Yasuko Fujisawa ◽  
Hiroyuki Ono ◽  
Tomoko Jinno ◽  
Tsutomu Ogata
Keyword(s):  
Animal Studies ◽  
Male Meiosis ◽  
Size Reduction ◽  
Pseudoautosomal Region ◽  
Minimal Size ◽  
Y Chromosomes ◽  
Cytogenetic Analyses ◽  
Human Spermatogenesis ◽  
Complete Deletion ◽  
Chromosomal Recombination

Abstract Mammalian male meiosis requires homologous recombination between the X and Y chromosomes. In humans, such recombination occurs exclusively in the short arm pseudoautosomal region (PAR1) of 2.699 Mb in size. Although it is known that complete deletion of PAR1 causes spermatogenic arrest, no studies have addressed to what extent male meiosis tolerates PAR1 size reduction. Here, we report two families in which PAR1 partial deletions were transmitted from fathers to their offspring. Cytogenetic analyses revealed that a ∼400-kb segment at the centromeric end of PAR1, which accounts for only 14.8% of normal PAR1 and 0.26% and 0.68% of the X and Y chromosomes, respectively, is sufficient to mediate sex chromosomal recombination during spermatogenesis. These results highlight the extreme recombinogenic activity of human PAR1. Our data, in conjunction with previous findings from animal studies, indicate that the minimal size requirement of mammalian PARs to maintain male fertility is fairly small.

scholarly journals Functional Gene Losses Occur with Minimal Size Reduction in the Plastid Genome of the Parasitic Liverwort Aneura mirabilis

2008 ◽  
Vol 25 (2) ◽  
pp. 393-401 ◽  
Author(s):  
N. J. Wickett ◽  
Y. Zhang ◽  
S. K. Hansen ◽  
J. M. Roper ◽  
J. V. Kuehl ◽  
...  
Keyword(s):  
Plastid Genome ◽  
Size Reduction ◽  
Functional Gene ◽  
Minimal Size ◽  
Aneura Mirabilis

Methods for particle size reduction of liposomal amphotericin B

2018 ◽  
Vol 60 (1) ◽  
pp. 42-45
Author(s):  
Tuan Quang Nguyen ◽  
Van Lam Nguyen ◽  
Thai Son Nguyen ◽  
Thi Minh Hue Pham ◽  
◽  
...  
Keyword(s):  
Particle Size ◽  
Amphotericin B ◽  
Liposomal Amphotericin ◽  
Size Reduction ◽  
Liposomal Amphotericin B ◽  
Particle Size Reduction
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