By William J. Krause
A renewed curiosity is commencing to emerge spotting the potential for marsupials as exact versions for biomedical study. due to their abbreviated interval of intrauterine improvement, marsupials are available types with which to review the early improvement of mammalian organ platforms. The North American opossum (Didelphis virginiana) has obtained extra clinical scrutiny than the other marsupial thus far. the aim of volumes I and II is twofold. the 1st objective is to attract jointly and in brief summarize the morphologal occasions and assisting quantitative info inquisitive about the histogenesis/organogenesis of a few of the organ platforms during this specific species. the second one objective is to supply an creation into the literature in regards to the biology of Didelphis virginiana and to collect jointly quite a few experiences that experience curious about this species. quantity I summarizes gametes and fertilization, blastocyst formation and early organogenesis, fetal membranes and placentation, parturition and migration to the pouch, basic postnatal progress and improvement, and histogenesis/organogenesis of the integument, musculoskeletal approach, cardiovascular approach, blood and blood forming organs, lymphatic organs, anxious process, eye, and ear. quantity II summarizes the histogenesis/organogenesis of the breathing approach, digestive method, urinary process, male reproductive approach, girl reproductive process, and classical endocrine system.
Read or Download A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana) PDF
Similar mammals books
During this full of life and illuminating dialogue of his landmark study, esteemed primatologist Frans de Waal argues that human morality isn't really imposed from above yet as an alternative comes from inside. ethical habit doesn't commence and finish with faith yet is in reality a made from evolution.
For a long time, de Waal has saw chimpanzees soothe distressed friends and bonobos proportion their nutrition. Now he supplies interesting clean proof for the seeds of moral habit in primate societies that extra cements the case for the organic origins of human equity. Interweaving bright stories from the animal country with considerate philosophical research, de Waal seeks a bottom-up clarification of morality that emphasizes our reference to animals. In doing so, de Waal explores for the 1st time the consequences of his paintings for our realizing of recent faith. regardless of the position of non secular ethical imperatives, he sees it as a “Johnny-come-lately” position that emerged merely as an addition to our animal instincts for cooperation and empathy.
But in contrast to the dogmatic neo-atheist of his book’s identify, de Waal doesn't scorn faith according to se. in its place, he attracts at the lengthy culture of humanism exemplified by way of the painter Hieronymus Bosch and asks reflective readers to contemplate those concerns from a good viewpoint: What position, if any, does faith play for a well-functioning society at the present time? And the place can believers and nonbelievers alike locate the foundation to guide an excellent life?
Rich with cultural references and anecdotes of primate habit, The Bonobo and the Atheist engagingly builds a special argument grounded in evolutionary biology and ethical philosophy. Ever a pioneering philosopher, de Waal supplies a heartening and inclusive new viewpoint on human nature and our fight to discover function in our lives.
This quantity emphasizes the comparative method of lower than status vertebrate renal functionality. i'm confident that this method is of specific worth in knowing either the main points of renal functionality on the mobile and subcellular degrees and the renal position in regulating fluid volumes and solute concentrations.
The main regularly saved household animal within the constructed global, the cat has been part of human lifestyles for hundreds of thousands of years. Cats were either worshipped and persecuted over this lengthy interval - both enjoyed or hated for his or her enigmatic self-reliance and the topic of diverse myths and fables. Highlighting startling discoveries remodeled the final ten years, this new version gains contributions from specialists in a variety of fields, delivering authoritative debts of the behaviour of cats and the way they have interaction with humans.
- Neurocytology: Fine Structure of Neurons, Nerve Processes, and Neuroglial Cells
- Intestinal Absorptive Surface in Mammals of Different Sizes
- A review of the laelapid mites associated with terrestrial mammals in Slovakia, with a key to the European species. - 1
- Endogenous Stem Cell-Based Brain Remodeling in Mammals
Additional info for A Review of Histogenesis/Organogenesis in the Developing North American Opossum (Didelphis virginiana)
The cytoplasm contains scattered mitochondria, free ribosomes and occasional proffies of granular endoplasmic reticulum. The morphological features of the mesonephroi remain unchanged from those of the newborn for 4 days into the postnatal period. 5 cm SRL), the mesonephros appears slightly curved and shrunken at its cranial pole. Nephrons within the cranial pole show varying degrees of regression. They often appear collapsed and their lumina become filled with dense-staining material. In contrast, nephrons within the caudal pole of the mesonephros appear normal and apparently are functional.
Unlike other enteroendocrine cell types, they follow a distal to proximal progression in their distribution as they increase in number in the small intestine with age (Krause et al. 1989b). Neurotensin-immunoreactive cells, although observed in the proximal colon of the newborn opossum, do not form a significant population until 75 days postnatal, and then are distributed throughout the colon. They increase in numbers with development and show a greater concentration distally (Table 35). ' Enteroendocrine cells within the intestinal epithelium of the developing and adult opossum, although randomly scattered, tend to occur as small clusters of cells expressing similar immunoreactivity (Krause et al.
140u... 3: .... 100 cu Q. VI Qj 60 U 20 1·5 2·5 4·5 7·5 10·0 15·5 20·0 Body length (em) Fig. 8. Quantitative data for hepatoeytes. (top) The number of mitotic and binucleate hepatocytes per 1,000 cells at various stages of development. (bottom) The number of hepatic cells per high power field at each stage of development. (Cutts et al. 1973) (Cutts et al. 1978a). As in other species, the myenteric plexus consists of ganglia and intersecting nerve fascicles (Christensen et al.