Educação sexual na escola a partir da psicologia histórico-cultural

Este artigo relata um projeto na área da Psicologia da Educação com referencial histórico-cultural. O projeto foi desenvolvido em uma escola de ensino fundamental que teve como objetivo oferecer educação sexual para adolescentes auxiliando-os para viverem com autonomia e responsabilidade sua sexualidade. A intervenção ocorreu em 15 encontros semanais, com o uso de diferentes estratégias metodológicas abrangendo os seguintes temas: 1) Identidade Grupal e levantamento de expectativas, 2) regras de convívio grupal, 3) Conceito de Sexualidade; 4) Conceito social de adolescência, 5) Fisiologia e saúde, 6) Saúde Sexual e reprodutiva, 7) Iniciação Sexual, 8) Gravidez na Adolescência, 9) Violência Sexual, 10) Padrões de Beleza e atitudes de discriminação e 11) Gênero e diversidade sexual. Alunos e professores avaliaram a proposta de intervenção como satisfatória e necessária na escola. Almeja-se a continuidade do projeto com outros alunos e oferecer formação aos professores.

Algumas reflexões sobre relacionamentos afetivos e relações sexuais na adolescência

Sexo e sexualidade são temas bastante abordados pela sociedade e suas instituições, desde a mídia até a universidade. Também a escola de ensino fundamental e médio vem sendo apontada como espaço propício para se trabalhar com orientação sexual, considerando inclusive as questões em voga como a gravidez não planejada na adolescência, as relações de gênero, o combate à homofobia e as doenças sexualmente transmissíveis, particularmente a AIDS. O presente trabalho é resultado de uma pesquisa realizada com adolescentes de 14 a 19 anos, estudantes de uma escola pública de ensino médio, tendo como objetivos verificar como pensam e se comportam os jovens frente a questões e atitudes que envolvem sexo e sexualidade. A técnica de coleta de dados foi a redação, em que os sujeitos escreveram sobre idéias, práticas e comportamentos sexuais, sendo que no recorte feito para a apresentação deste artigo, nos prendemos aos relacionamentos afetivos e relações sexuais.

Orientação sexual nas aulas de educação física escolar

Sexual Orientation is present in the school setting, due to human relationships among all belonging to this area. Being a cross-cutting theme, this theme pervades the Physical Education and allows discussions related to the gender, body and media, respect for diversity, disease prevention and other topics that the contents of body culture allow to deal. With observation and participation in the school context, through a stage of more than a year, we realized the need to address the issue of sexual orientation with students. In addition, there is a dearth of articles dealing with this topic, a factor that complicates and limits the search fields of material for the teacher preparing lessons and address the issue. Thus, this study aims to develop classes to subsidize the practice of teachers of physical education in relation to Sexual Orientation. The preparation of activities was carried out from a bibliographic review and experiences of the researchers, presenting new possibilities to teacher to treat this subject in classes of that discipline. The topics covered are intended to demystify some pre-concepts related to gender in bodily practices that are socially constructed. Also, presented a way to address STDs and teenage pregnancy, topics not found in academic magazines of the area used in this study. Treating Sexual Orientation in Physical Education classes may seem at first a tricky and of difficult data collection. The teacher must seek this knowledge so that it can address the issue with students in a transparent and really effective not being only informative classes meaningless or decontextualized thoughts

A reincidência da gravidez na adolescência e a evasão escolar

Pós-graduação em Educação Escolar - FCLAR

Real time B-mode ultrasound in pacas pregnancy (Agouti paca, Linnaeus, 1766)

O objetivo deste estudo foi estabelecer o tempo de prenhez da paca por meio de ultra-sonografia. Nove pacas prenhes foram periodicamente acompanhadas com um transdutor eletrônico setorial bi-frequencial de 5,0 e 7,5 MHz, em modo B, desde a detecção ultra-sonográfica da vesícula embrionária ou do feto até o nascimento dos filhotes. Os animais foram colocados em uma gaiola de ferro de prensagem lateral e permaneceram em posição quadrupedal durante as sessões. Um pano escuro foi usado para cobrir a gaiola e frutas foram oferecidas durante o exame ultra-sonográfico para evitar reações agressivas. Quanto mais precocemente ocorreu a detecção de prenhez, maior foi o período de acompanhamento ultra-sonográfico até o nascimento dos filhotes. Apenas um filhote nasceu por parto, com 796,5 ± 74,36 gramas (valor médio ± desvio padrão da amostra) e 33,46 ± 0,60 centímetros (valor médio ± desvio padrão da amostra) de comprimento (entre a borda rostral do focinho e a extremidade distal da cauda). O período de prenhez da paca abrange 135 a 139 dias.

Effect of breed and corpus luteum on pregnancy rate of bovine embryo recipients

The objective of this study was to evaluate pregnancy rates of recipients of different breed groups (Nellore and crossbreed), as well as the effects of size and type of the corpus luteum (CL) on plasmatic concentrations of progesterone and pregnancy rates of embryo recipients. A total of 152 heifers were synchronized with progesterone implants and on the day of embryo transfer, previously obtained by superovulation and frozen in ethylene glycol, the diameter and type of the corpus luteum (cavitary and compact) was measured and blood was collected for progesterone measurement. The pregnancy rate was 44.1%, with a diameter of corpus luteum higher in recipients that became pregnant (2.03±0.41) compared with non-pregnant ones (1.86±0.34 cm). Plasmatic concentrations of progesterone did not differ between pregnant (1.50±1.05) and non-pregnant (1.31±0.91 ng/mL) animals. The type of corpus luteum did not influence the pregnancy rates. Only Angus and crossbred Marchigiana differ among themselves in pregnancy rates (33.3 and 59.2%, respectively). The pregnancy probability was affected only by CL diameter, but not by P4 plasmatic concentration. Selection of the corpus luteum size at the time of embryo transfer is an important factor to increase pregnancy rates in recipients, and compact and cavitary corpora lutea do not influence the pregnancy rates of bovine embryo recipients. Nellore recipients have pregnancy rates that are satisfactory and comparable to crossbred (Bos taurus × Bos indicus) recipients.

Monitoring ovarian cycles and pregnancy in brown brocket deer (Mazama gouazoubira) by measurement of fecal progesterone metabolites

In the present study, pregnancy and the estrous cycle were monitored in captive brown brocket deer (Mazama gouazoubira) by measuring fecal progestagens with a commercial enzyme immunoassay (EIA), along with behavioral data. Fecal samples were collected twice a week during pregnancy and daily during the estrous cycle and post-partum period. It was possible to distinguish between inter-luteal and luteal phases of the estrous cycle. Behavioral estrus corresponded with low concentrations of fecal progestagens. Samples from two consecutive cycles were available from five hinds, and the mean estrous cycle (n = 10) was 26.9 +/- 1.7 d (mean +/- S.E.M.). However, when two extreme cycles (34 and 37 d) were deleted, the mean estrous cycle was 24.7 +/- 1.2 d. Three animals became pregnant (gestation ranged from 208 to 215 d). After fertile breeding, progestagen concentration in these hinds remained among luteal phase concentrations throughout pregnancy, with the exception of a few peaks. Within 4 d post-partum, two hinds reached interluteal phase values, while one hind maintained luteal concentrations for at least 1 week. (C) 2005 Elsevier B.V. All rights reserved.

Genetic parameters and relationships of heifer pregnancy and age at first calving with weight gain, yearling and mature weight in Nelore cattle

The objectives of the current study were to investigate the additive genetic associations between heifer pregnancy at 16 months of age (HP16) and age at first calving (AFC) with weight gain from birth to weaning (WG), yearling weight (YW) and mature weight (MW), in order to verify the possibility of using the traits measured directly in females as selection criteria for the genetic improvement of sexual precocity in Nelore cattle. (Co)variance components were estimated by Bayesian inference using a linear animal model for AFC, WG, YW and MW and a nonlinear (threshold) animal model for HP16. The posterior means of direct heritability estimates were: 0.45 +/- 0.02; 0.10 +/- 0.01; 023 +/- 0.02; 0.36 +/- 0.01 and 0.39 +/- 0.04, for HP16, AFC, WG, YW and MW, respectively. Maternal heritability estimate for WG was 0.07 +/- 0.01. Genetic correlations estimated between HP16 and WG, YW and MW were 0.19 +/- 0.04; 0.25 +/- 0.06 and 0.14 +/- 0.05, respectively. The genetic correlations of AFC with WG, YW and MW were low to moderate and negative, with values of -0.18 +/- 0.06; -0.22 +/- 0.05 and -0.12 +/- 0.05, respectively. The high heritability estimated for HP16 suggests that this trait seem to be a better selection criterion for females sexual precocity than AFC. Long-term selection for animals that are heavier at young ages tends to improve the heifers sexual precocity evaluated by HP16 or AFC. Predicted breeding values for HP16 can be used to select bulls and it can lead to an improvement in sexual precocity. The inclusion of HP16 in a selection index will result in small or no response for females mature weight. (C) 2011 Elsevier B.V. All rights reserved.

Effect of pregnancy on the genetic evaluation of dairy cattle

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effects of hypertension on maternal adaptations to pregnancy: experimental study on spontaneously hypertensive rats

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Effects of Annona squamosa extract on early pregnancy in rats

Annona squamosa Linn., family Annonaceae, is said to show varied medicinal effects, including insecticide, antiovulatory and abortifacient. The purpose of present study was to investigate if A. squamosa seed aqueous extract, in doses higher than that popularly used to provoke abortion, interferes with reproductive performance, and to correlate the ingestion of this extract with possible alterations in rat embryonic implantation. Doses of 300 mg/kg (Treated Group I, n = 17) and 600 mg/kg (Treated Group II, n = 12) body wt. were administered by gavage, during days 1 to 5 of pregnancy (preimplantation period). The control group (n = 13) received water in the same manner, during the same period for comparison with experimental groups. The animals were euthanized on day 10 of pregnancy. Treatment of dams during the preimplantation period showed no signs of toxicity, and no alteration in the corpora lutea, implantations and embryo in terms of development numbers. The percentage of preimplantation and postimplantation losses in treated groups I and II did not differ from those of control. Treatment with aqueous extract of A. squamosa seeds caused no morphological change in the endometrium. The absence of morphological alterations in uterine epithelial cells in treated groups I and II permitted a viable embryonic implantation, as verified by the number of embryos in development at day 10 of pregnancy. Thus, A. squamosa seed aqueous extract did not interfere with the reproductive performance of pregnant rats.

Accuracy of fetal gender determination in maternal plasma at 5 and 6 weeks of pregnancy

Objective To assess the viability of the early diagnosis of fetal gender in material plasma before 7 weeks of pregnancy by real-time polymerase chain reaction (real-time PCR), starting at 5 weeks of pregnancy.Method peripheral blood was collected from pregnant women, starting at 5 weeks of gestation. After centrifugation, plasma was separated for fetal DNA extraction. DNA was analyzed by quantitative real-time PCR for two genomic regions, one on the Y chromosome (DYS-14) and the other shared by both sexes (beta-globin), by the TaqMan Minor Groove Binder (MGB) probe assay. The results of the examinations were compared to fetal gender determined after delivery.Results A total of 79 examinations of fetal DNA in maternal plasma were performed for 52 pregnant women. Accuracy according to gestational age was 92.6% (25 of 27 cases) at 5 weeks, and 95.6% (22 of 23 cases) at 6 weeks. These results also demonstrate that fetal DNA is present at low concentrations in maternal plasma at 5 weeks (8.5 genome equivalents (GE)/mL) and 6 weeks (34.1 GE/mL) of pregnancy.Conclusion Quantitative real-time PCR and TaqMan MGB probes specific for the detection of fetal gender in maternal plasma starting at 5 weeks of gestation have good sensitivity and excellent specificity. Copyright (c) 2006 John Wiley & Sons, Ltd.