"contemplari et contemplata aliis tradere" ("to contemplate and pass on the contemplated things to others") —Dominican motto; cf. S.T. III q. 40 a. 1 ad 2
Started by tacf, November 12, 2022, 06:15:44 AM
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Quote"The power existing in the semen which is derived from the father is a permanent intrinsic power, not one coming from an extrinsic principle, just as the power of the mover which exists in the thing thrown is intrinsic. Hence the power which is in the semen operates no matter how far away the father may be. For the active power which is in the semen cannot be caused by the mother (although some indeed maintain this), because the woman is not an active principle but a passive one. Nevertheless there is some similarity here, because, just as the thrower's power, which is finite, moves an object to a definite place some distance away by local motion, so does the power of one generating move a thing to a determinate form by the movement of generation."
Quote"about the life of the semen at the beginning of its severance, it is clear from what has been said that it is not living except potentially. Therefore, it has a soul then not actually, but virtually. In the process of generation, it has a vegetative and a sensitive soul by the virtue of the semen, which do not remain but pass away when the rational soul takes their place."
Quote"The fully differentiated male gamete is usually a highly polarized and motile cell type specialized for the single function of oocyte fertilization. Associated with a much reduced internal volume, the mature sperm cell lacks a variety of organelles, including endoplasmic reticulum, Golgi apparatus and cytosolic ribosomes, which are not required for those processes leading up to and including fertilization. Moreover, as recently reviewed, at the time that mammalian sperm are released into seminiferous tubules the processes of genomic transcription and translation have largely been silenced; though it is likely that sperm deliver a variety of RNA species into the fertilized oocyte that may modulate early events in embryogenesis."
Quote"Accordingly, the human body is fashioned at the same time both by the power of God as the principal and first agent, and by the power of the semen as secondary agent, but God's action produces the human soul, which the seminal power cannot produce, but to which it disposes."
Quote"by way of active potency or efficacy; after the manner of a cause. Not actually, but equivalently and implicitly".
Quote"the generation of an animal is not one simple generation alone, but that many generations and corruptions follow one another. For it is said that first the animal has the form of semen, then the form of blood, and so on successively until generation is completed. And therefore since corruption and generation do not take place without the loss of one form and the acquisition of another, the imperfect form which first exists within the embryo must be discarded and a more perfect one assumed. This continues until the thing conceived has acquired its perfect form. Consequently it is said that the vegetal soul first exists in the semen, but that it is lost in the process of generation, and that another soul succeeds it which is not only vegetal, but also sentient. Then another soul is added to this which is at once vegetal, sentient, and rational."
Quote"Human in vitro gametogenesis may transform reproductive medicine. Human pluripotent stem cells (hPSCs) have been induced into primordial germ cell-like cells (hPGCLCs); however, further differentiation to a mature germ cell has not been achieved. Here, we show that hPGCLCs differentiate progressively into oogonia-like cells during a long-term in vitro culture (approximately 4 months) in xenogeneic reconstituted ovaries with mouse embryonic ovarian somatic cells. The hPGCLC-derived oogonia display hallmarks of epigenetic reprogramming-genome-wide DNA demethylation, imprint erasure, and extinguishment of aberrant DNA methylation in hPSCs-and acquire an immediate precursory state for meiotic recombination. Furthermore, the inactive X chromosome shows a progressive demethylation and reactivation, albeit partially. These findings establish the germline competence of hPSCs and provide a critical step toward human in vitro gametogenesis."
Quote"Interspecies blastocyst complementation enables organ-specific enrichment of xenogenic pluripotent stem cell (PSC) derivatives. Here, we establish a versatile blastocyst complementation platform based on CRISPR-Cas9-mediated zygote genome editing and show enrichment of rat PSC-derivatives in several tissues of gene-edited organogenesis-disabled mice. Besides gaining insights into species evolution, embryogenesis, and human disease, interspecies blastocyst complementation might allow human organ generation in animals whose organ size, anatomy, and physiology are closer to humans. To date, however, whether human PSCs (hPSCs) can contribute to chimera formation in non-rodent species remains unknown. We systematically evaluate the chimeric competency of several types of hPSCs using a more diversified clade of mammals, the ungulates. We find that naïve hPSCs robustly engraft in both pig and cattle pre-implantation blastocysts but show limited contribution to post-implantation pig embryos. Instead, an intermediate hPSC type exhibits higher degree of chimerism and is able to generate differentiated progenies in post-implantation pig embryos."
Quote"Now we must observe that the carnal generation of animals is effected by an active and a passive function. The father takes an active part, while the mother's part is passive, so that the begetting of offspring belongs to the father as regards certain conditions, and to the mother as regards others. It belongs to the father to give his offspring its nature and species, while conception and gestation belong to the mother, whose part is passive and receptive. ... ...conception and birth in corporeal beings include movement and consequently some kind of succession—since the term of conception is the existence in the conceiver of that which has been conceived, and the term of birth is the separate existence of the offspring apart from the parent"
Quotefortune is rightly said to be without reason. For we can reason only about those things that happen always or in most instances. But fortune lies outside of both of these. And so, since such causes, which occur in exceptional cases, are per accidens and infinite and without reason, it follows that causes by fortune are infinite and without reason. For every per se cause produces its effect either always or in most cases.
QuoteAn essential cause is before an accidental cause. Hence if later things are from a determinate essential cause, it is unfitting to say that the first things are from an indeterminate accidental cause. Now the distinction of things naturally precedes their movements and operations, since determinate movements and operations belong to things determinate and distinct. But movements and operations of things are from essential and determinate causes, since we find that they proceed from their causes in the same way either always or for the most part. Therefore, the distinction of things is also from an essential determinate cause, and not from chance, which is an indeterminate accidental cause.
Quote"A small percentage of hydatidiform moles have biparental diploid genomes, as in normal living persons; they have two sets of chromosomes, one inherited from each biological parent. Some of these moles occur in women who carry mutations in the gene NLRP7, predisposing them towards molar pregnancy. These rare variants of hydatidiform mole may be complete or partial."
QuoteTherefore our explanation must be different, namely, that the generation of an animal is not one simple generation alone, but that many generations and corruptions follow one another. For it is said that first the animal has the form of semen, then the form of blood, and so on successively until generation is completed. And therefore since corruption and generation do not take place without the loss of one form and the acquisition of another, the imperfect form which first exists within the embryo must be discarded and a more perfect one assumed. This continues until the thing conceived has acquired its perfect form. Consequently it is said that the vegetal soul first exists in the semen, but that it is lost in the process of generation, and that another soul succeeds it which is not only vegetal, but also sentient. Then another soul is added to this which is at once vegetal, sentient, and rational.
Quote"... a substantial form is brought into act not continuously or by degrees but instantaneously (else movement would needs be in the genus of substance just as it is in that of quality)... Thus the form of fire is not produced in the air so as gradually to advance from imperfection to perfection, since no substantial form is subject to increase and decrease, but it is the matter alone that is changed by the previous alteration so as to be more or less disposed to receive the form; and the form does not begin to be in the matter until the last instant of this alteration."
QuoteThat it is the substantial form both of the whole and of the parts is clear from the fact that both the whole and the parts take their species from it. Hence, when it departs, neither whole nor parts retain the same species: for the eye or flesh of a dead person are only so called equivocally. Accordingly, if the soul is the act of each part, and an act is in the thing of which it is the act, it follows that it is by its essence in each part of the body.
Quote from: tacf on November 14, 2022, 07:11:58 PMFrom what I could tell, "preformationism" says there was an inanimate body and then a rational souled body.
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