Step-by-Step Solution:1. Understand the Question: The question asks who proposed the apical cell theory. This requires knowledge of the contributions of various scientists listed in the options.2. <stron
A niche hypothesis for stem cells was proposed by Schofield [25]. In these studies, approximately half of the CFU-s colonies were on the spleen surface and most of these were erythroid. Granulocytic colonies were detected in sub capsular sheets or along the trabeculae and megakaryocyte colonies ...
Pasteur's theory was rejected in its entirety by Virchow who was convinced that the diseased tissue was caused by changes within healthy cells, but not from invasion of other organisms [49]. Virchow tried to understand the nature and origin of cancer, and some of his theories were correct; ...
General acceptance of Cell Theory was finally possible only when the cellular nature of brain tissues was confirmed at the end of the 20th century. Cell Theory then rapidly turned into a more dogmatic cell doctrine, and in this form survives up to the present day. In its current version, ...
Virchow’s cell theory was introduced to neuroscience by Cajal, whose ‘neuron doctrine’ postulated that the structural unit of the nervous system was the individual neuron2. Since then, generations of investigators have described hundreds of cell types in nervous systems of different species. This...
When scientists like Jean-Baptiste Dumas (1800–1884) embraced the atomic theory of matter, they tried to determine the empirical formula for many substances, including wood fibers. Anselme Payen succeeded in measuring the composition as C = 44.4 %, O = 49.4 %, H = 6.2 %, identical to tha...
According to the idea of the differentiation theory, it implies that both errors in the genetic program and DNA replication are at least moderately affected by exogenous factors. Age-related alterations of the lymphohematopoietic system, particularly of its lymphoid part, are well reported. However,...
On the basis of the cell theory of liquids and the law of corresponding states several char-acteristic parameters of substances-configuration factor, internal pressure factor and polarityfactor had been presented. Thus, the correlation of free volume variable with configurationfactor and internal pressu...
(Fig.6c). The goblet cell macrostate was distinguished from club cells by the expression of specific mucin genes such asMuc5bandMuc5ac, as well as secreted proteins involved in innate immunity, such asBpifb1(Extended Data Fig.9c). Analysis of fate probabilities towards basal and goblet ...
V. Unitarian theory of the origin of the four epithelial cell types. Am. J. Anat. 141, 537–561 (1974). CAS PubMed Google Scholar Bjerknes, M. & Cheng, H. Clonal analysis of mouse intestinal epithelial progenitors. Gastroenterology 116, 7–14 (1999). CAS PubMed Google Scholar ...