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Zygote (Cambridge, England)|February 1, 1997
Stage-specific requirement of phosphate for development of rat 1-cell embryos in a chemically defined mediumK Miyoshi, K NiwaJournal of Reproduction and Fertility|July 1, 1978
Effect of various hexoses on sperm capacitation and penetration of rat eggs in vitroK Niwa, A IritaniActa Biologica Hungarica|July 24, 2004
Nitric oxide regulates the levels of cGMP accumulation in the cricket brainH Aonuma, K NiwaTheriogenology|October 1, 1988
Synergistic effect of caffeine and heparin on in-vitro fertilization of cattle oocytes matured in cultureK Niwa, O OhgodaRadiation Medicine|January 1, 1987
New equipment for a radiation therapy simulator: a device for simplifying irregular field shaping and integrating simulator and therapy machineK Niwa, K FujikawaJapanese Journal of Ophthalmology|March 24, 1998
Measurement of temporal summation of visual acuity with use of modified tachistoscopeK Niwa, T TokoroTheriogenology|January 1, 1994
Completion of first meiosis by sperm penetration in vitro of bovine oocytes inhibited at metaphase-I with dimethylsulphoxideR C Chian, K NiwaJournal of Reproduction and Fertility|June 1, 1975
Fertilization of rat eggs in vitro at various times before and after ovulation with special reference to fertilization of ovarian oocytes matured in cultureK Niwa, M C ChangZygote (Cambridge, England)|May 1, 1997
Transformation of sperm nuclei into metaphase chromosomes in maturing pig oocytes penetrated in vitroW H Wang, K NiwaPageof 169