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Wilmington Maternal Group

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Alexander Miller
Alexander Miller

English Mature Sex

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Theologian Edith Humphrey commented that "the Graeco-Roman 'ideal' regarding homosexuality entailed erotic love, not of children, but of young (teenage) males of the same age that a young woman would be given in marriage, and that frequently the more mature male was only slightly older than the partner."[22]

Notes: (1) all course readings (except for links to webpages embedded below) are from Joseph Kelly, ed., The Seagull Book of Poems, 4th ed. (Norton, 2018); (2) along with the poems listed here we will also enjoy some student-selected ones through class presentations; (3) some of the poems below deal with mature themes, sexual content, and racial and sexual epithets; if you wish to request an accommodation with respect to such material, please email the instructor before the end of the first full week of classes (September 17th); finally, (4) not all poems on the syllabus will be discussed in detail in class meetings, but discussed or not, they are there for you to enjoy, to use in your discussion posts and assignments, and to enrich the range of your poetic experiences.

It is known that estrogen-like environmental pollutants can feminise gonadal differentiation in frogs resulting in female-biased sex-ratios at metamorphosis. The long-term effects on reproductive function in frogs following larval exposure to pollutants are less known. Amphibian test systems which allow life-cycle studies are therefore needed. The aim of the present study was to characterise long-term estrogenic effects on the reproductive system of the emerging model species Xenopus (Silurana) tropicalis following larval exposure to ethynylestradiol (EE2). EE2 is a synthetic estrogen that has been detected in sewage effluents and in surface waters. Newly hatched tadpoles (Niewkoop Faber (NF) stage 48) were exposed to the nominal EE2 concentrations 0 (control), 1, 10, and 100 nM (with analytical chemistry support) until complete metamorphosis (NF stage 66). Effects on the reproductive organs were determined in juveniles (I month after metamorphosis) and in 9-month-old frogs. Larval exposure to EE2 caused female-biased phenotypic sex-ratios in both juvenile and adult frogs, which is in agreement with previous work on other frog species. Nearly all (97%) of the 63 EE2-exposed 9-month-old frogs had ovaries. Histological evaluation of the gonads of the 9-month-old frogs showed that they were sexually mature. Among the adult frogs with ovaries there was a dose-dependent increase in the frequency of individuals lacking oviducts. Adult frogs exposed to 100 nM EE2 that had ovaries but no oviducts had lower levels of estrogen receptor alpha (ER alpha) mRNA in the brain than control animals and those exposed to 100 nM EE2 that had ovaries as well as oviducts. EE2 exposure did not cause any significant changes in ER alpha mRNA levels in the ovaries of the adult frogs. The reduced level of ER alpha mRNA in the brain of individuals with ovaries lacking oviducts suggests an organizing effect of EE2 on the central nervous system. The results show that transient early life-stage exposure to an environmental pollutant can induce effects on the reproductive organs and the central nervous system that persist into adulthood. Overall, our data suggest that X. tropicalis, which has a shorter generation time than the well-established model species Xenopus laevis, is a suitable model organism for research on developmental reproductive toxicity in anuran species.

Amphibian populations are declining world-wide and one of the suggested reasons is environmental pollutants. Studies of long-term effects on the reproductive system in frogs following larval exposure to environmental pollutants are scarce. It is therefore important to develop methods to study developmental reproductive toxicity in amphibians. In this thesis the usefulness of Xenopus tropicalis (the West African clawed frog) as a model species for a test system was investigated. Effects on the reproductive system after larval exposure to the pharmaceuticals ethynylestradiol (EE2) and clotrimazole were evaluated. The susceptibility to EE2 exposure was compared between the model species and a wild species, the European common frog (Rana temporaria). Larval exposure to EE2 caused female-biased sex ratios in both examined frog species, indicating male-to-female sex-reversal. In adult Xenopus tropicalis, male frogs that were not sex-reversed had reduced fertility and decreased amount of mature spermatozoa in the seminiferous tubules. The proportion of frogs with ovaries but lacking oviducts increased with increasing EE2-concentrations. A female frog without oviducts is sterile. The development of ovaries in sex-reversed male frogs was implied to be similar to control females. The combination of a reduced number of males, due to sex-reversal, and impaired fertility could have severe effects on frog populations. Larval exposure to clotrimazole modulated aromatase activity in gonads and brain in Xenopus tropicalis. Brain aromatase activity was decreased at the time for gonadal differentiation and gonadal aromatase activity was increased at metamorphosis. The findings in this thesis indicate that reproduction in wild frogs might be impaired by estrogenic compounds in the environment. The results combined with the short generation time supports the use of Xenopus tropicalis as a model species when evaluating long term effects of endocrine disruptors on the reproductive system in amphibians.

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The live weight of lambs slaughtered at 6, 9 and 12 months of age differed between the breeds. Awassi lambs were less mature than Najdi or Hejazi lambs at slaughter. Hejazi lambs grew (relative to their mature size) faster than lambs of the other two breeds. The allometric regression coefficients of body components were similar1 in the breeds except those of the head, skin and genital organs.

Body composition of the breeds was reasonably similar at the same degree of body maturity or growth rate except skin and feet proportions were higher in Awassi and Najdi lambs, respectively, than in the other two breeds. Thus the three breeds conform to the scaling rules relating growth characteristics to mature size. 041b061a72


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