N
Nicolas H. Zech
Researcher at University of Graz
Publications - 86
Citations - 1943
Nicolas H. Zech is an academic researcher from University of Graz. The author has contributed to research in topics: Embryo transfer & Stem cell. The author has an hindex of 21, co-authored 86 publications receiving 1785 citations. Previous affiliations of Nicolas H. Zech include University of Zurich.
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Putative stem cells with an embryonic character isolated from the ovarian surface epithelium of women with no naturally present follicles and oocytes
Irma Virant-Klun,Nicolas H. Zech,Primož Rožman,Andrej Vogler,Branko Cvjetičanin,Polona Klemenc,Elvira Maličev,Helena Meden-Vrtovec +7 more
TL;DR: The discovered cells are proposed to represent the adult OSCs with the expression of embryonic stem cell markers, and a new term "embryonic-like stem cells of the adult" is proposed for embryonic- like stem cells that might persist in various tissues and organs of adults.
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Blastocyst development after sperm selection at high magnification is associated with size and number of nuclear vacuoles.
Pierre Vanderzwalmen,Antje Hiemer,Paul Rubner,Magnus Bach,Anton Neyer,Astrid Stecher,P Uher,Martin Zintz,Bernard Lejeune,Sabine Vanderzwalmen,Guy Cassuto,Nicolas H. Zech +11 more
TL;DR: Spermatozoa selection at high magnification before intracytoplasmic sperm injection seems to be positively associated with pregnancy rates after day 3 embryo transfers and 'early and late paternal effects', both of which may have an impact on early embryonic development are confirmed.
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Vitrification of human blastocysts with the Hemi‐Straw carrier: application of assisted hatching after thawing
Pierre Vanderzwalmen,G. Bertin,C. Debauche,V. Standaert,N. Bollen,E. Van Roosendaal,M. Vandervorst,Robert Schoysman,Nicolas H. Zech +8 more
TL;DR: Artificial opening of the zona pellucida after warming of vitrified blastocysts significantly improved the rate of transfers with hatched blastocyst and the implantation and pregnancy rates.
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Vitrification of hatching and hatched human blastocysts: effect of an opening in the zona pellucida before vitrification.
TL;DR: This study shows that partially or completely hatched blastocysts can be cryopreserved by a simple vitrification procedure using the hemi-straw as embryo carrier.
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Aseptic vitrification of blastocysts from infertile patients, egg donors and after IVM
Pierre Vanderzwalmen,Fabien Ectors,Luc Grobet,Yannis Prapas,Yannis Panagiotidis,Sabine Vanderzwalmen,Astrid Stecher,P. Frias,Juergen Liebermann,Nicolas H. Zech +9 more
TL;DR: In spite of reduced cooling rates due to aseptic vitrification conditions, a three-step exposure to cryoprotectant solutions protects the embryos effectively from cryo-injuries and guaranties high survival rates.