Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Infertility in Females01:28

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of endometrial...
Infertility in Males01:23

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
Fertilization01:38

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
In Vitro Fertilization01:24

In Vitro Fertilization

In vitro fertilization (IVF) is a form of assisted reproductive technology where an egg is fertilized with sperm in a controlled laboratory environment before transferring the resulting embryo into the uterus. This process is designed to help individuals and couples experiencing difficulties conceiving.
The IVF process begins with ovarian stimulation, during which reproductive endocrinologists prescribe hormonal medications to stimulate the ovaries to produce multiple eggs instead of the single...
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
Spermatogenesis01:22

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The size and structure of residential families, Guatemala City, 1964.

Population studies·2011
Same author

Trends in retirement age in the United States, 1955-1993, by sex and race.

The journals of gerontology. Series B, Psychological sciences and social sciences·1996
Same author

Retirement quandary: more retirees at younger ages, living longer.

Population today·1993
Same author

Stalls in fertility decline in Costa Rica, Korea, and Sri Lanka.

Population today·1985
Same author

The dynamics of population momentum.

Population today·1984
Same author

Sweden's population grows, Swedish population doesn't.

Population today·1984

Related Experiment Video

Updated: Jun 4, 2026

Mass Production of Genetically Modified Aedes aegypti for Field Releases in Brazil
17:41

Mass Production of Genetically Modified Aedes aegypti for Field Releases in Brazil

Published on: January 4, 2014

Fertility and development in Brazil.

M Gendell1

  • 1Georgetown University, Georgetown, USA.

Demography
|February 1, 2011
PubMed
Summary

Despite significant development and existing fertility differentials, Brazil experienced no fertility decline between 1940-1960. This challenges established demographic theories on development and fertility, raising concerns for future population growth.

Area of Science:

  • Demography
  • Sociology
  • Economics

Background:

  • Historically, socioeconomic development correlates with reduced fertility rates.
  • Demographic transition theory predicts fertility decline with urbanization and education.
  • Brazil presents a unique case study challenging these established theories.

Purpose of the Study:

  • To analyze fertility trends in Brazil amidst significant socioeconomic development.
  • To investigate the relationship between development indicators and fertility changes in Brazil.
  • To reassess existing demographic theories based on Brazilian data.

Main Methods:

  • Analysis of Brazilian demographic and socioeconomic data from 1920-1960.
  • Examination of changes in industrial structure, per capita income, urbanization, and education.

More Related Videos

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil
06:48

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil

Published on: July 29, 2020

Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences
12:14

Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences

Published on: November 17, 2023

Related Experiment Videos

Last Updated: Jun 4, 2026

Mass Production of Genetically Modified Aedes aegypti for Field Releases in Brazil
17:41

Mass Production of Genetically Modified Aedes aegypti for Field Releases in Brazil

Published on: January 4, 2014

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil
06:48

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil

Published on: July 29, 2020

Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences
12:14

Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences

Published on: November 17, 2023

  • Comparison of observed fertility rates with theoretical expectations.
  • Main Results:

    • Substantial social and economic development occurred in Brazil between 1920-1960.
    • Fertility rates showed little to no decline, remaining constant around 43 births per 1000 population from 1940-1960.
    • Falling death rates and constant fertility led to accelerating population growth.

    Conclusions:

    • Prevailing theories on development and fertility require modification for greater specificity.
    • Brazil's high population growth rate poses challenges to sustained economic development.
    • Further research is needed to understand fertility dynamics in developing nations.