During pregnancy, the cervix is blocked by a special antibacterial mucosal plug, which prevents infection, somewhat similar to its state during the infertile portion of the menstrual cycle.

During the menstrual cycle or estrous cycle, the endometrium grows to a thick, blood vessel-rich, glandular tissue layer.

During puberty the hymenal opening can also be enlarged by tampon, menstrual cup use, pelvic examinations with a speculum, regular physical activity or sexual intercourse.

During the initial evaluation, a medical history is obtained, including gravidity ( number of prior pregnancies ), parity ( number of prior deliveries ), last menstrual period, contraception use, prior abnormal pap smear results, allergies, significant past medical history, other medications, prior cervical procedures, and smoking history.

During a woman's menstrual cycle, the endometrium thickens in preparation for potential pregnancy.

During the first two years after menarche 50 % of the menstrual cycles could be anovulatories.

During a woman ’ s menstrual cycle, a woman goes into seclusion because the idea of it is seen as a transgression and destructive.

During the study, recipient women were exposed daily to the collected compounds, and the resulting effects on their menstrual cycles were tabulated.

During this time, the water in the main shrine runs red with iron oxide resembling menstrual fluid.

During this precarious period of development the mother should continue to influence the growth of the child's conscience.

During the period from 1 July 1960 through 31 January 1961, additional research affiliations were effected with the U. S. Army Medical Research and Development Command to conduct research in procedures for quantitative electron microscopy, and for the study of biophysical and biological studies of the structure and function of ocular tissue.

During this period, a total of 762 exhibits were presented at 442 medical and scientific meetings.

During the period of this report, 37,470 new cases were entered into the various registries.

During this period, 7,827 teaching sets were distributed on loan.

During the period of this report, 63 panel exhibits depicting the latest developments in medical research were displayed.

During the period, the laboratory rendered centralized macropathological service to qualified requesters.

During the period from 1 July 1960 through 31 January 1961, the Medical Museum was required to move to Temporary Building `` S '' on the Mall from Chase Hall.

During the period of about 4 hours around sunset, skywave transmission conditions are building up until full nighttime conditions prevail ; ;

During the Civil War period Mr. Brown also invented the Brown & Sharpe formed tooth gear cutter, a basic invention which ultimately revolutionized the world's gear manufacturing industry by changing its basic economics.

During this period 7,484,268 members were received, yet the net membership now is only 9,910,741.

During the period of the Iberian Union ( 1580 – 1640 ), Portugal lost influence and power and made new enemies.

During the Romantic period, art came to be seen as " a special faculty of the human mind to be classified with religion and science ".< ref >

During the same period the Georgian states of Colchis and Tabal arose around the Black Sea and central Anatolia respectively.

During this same period, slave-holding border states had more free African-Americans and European immigrants than the lower South, which increased Southern fears that slavery was threatened with rapid extinction in this area.

During this period he published 18 plays and 3 novels, including the murder mystery The Red House Mystery ( 1922 ).

During this period winter sports were slowly introduced: in 1882 the first figure skating championship was held in St. Moritz, and downhill skiing became a trendy sport with English visitors early in the 20th century, as the first ski-lift was installed in 1908 above Grindelwald.

During the post-World War I period ski-lifts were built in Swiss and Austrian towns to accommodate winter visitors, but summer tourism continued to be important ; by the mid-20th century the popularity of downhill skiing increased greatly as it became more accessible and in the 1970s several new villages were built in France devoted almost exclusively to skiing, such a Les Menuires.

During the first 11 months of 2006, net imports grew by 21 percent to $ 1. 95 billion, while exports stood at $ 895 million, up 0. 3 percent from the same period in 2005.

During the first 11 months of 2006, the European Union remained Armenia's largest trading partner, accounting for 34. 4 percent of its $ 2. 85 billion commercial exchange during the 11-month period.

During January – February 2007, Armenia ’ s trade with Russia and other former Soviet republics was $ 205. 6 million ( double the amount from the same period the previous year ), making them the country ’ s number one trading partner.

During this period, spectator attendances dropped and media condemnation increased, but Simpson and Lawry flatly disregarded the public dissatisfaction.

During the Tokugawa period ( 1600 – 1868 ) the Ainu became increasingly involved in trade with Japanese who controlled the southern portion of the island that is now called Hokkaido.

During this period Agamemnon and his brother, Menelaus, took refuge with Tyndareus, King of Sparta.

During the Akkadian period, the Akkadian language became the lingua franca of the Middle East, and was officially used for administration, although the Sumerian language remained as a spoken and literary language.

During the short reigns of the older two of his three elder brothers, Æthelbald of Wessex and Æthelberht of Wessex, Alfred is not mentioned.

During the first years of the reign of his older brother as Elector, Anton was the third in line, preceded only by his older brother Karl.

During the 1950s, however, Graham began distancing himself from the older fundamentalism and, in preparation for his 1957 New York Crusade, he sought broad ecumenical sponsorship.

During older periods of the Greek language, loan words into Greek acquired Greek inflections, leaving thus only a foreign root word.

During the show's peak in popularity, Hee Haw often competed in syndication against The Lawrence Welk Show, a long-running ABC program which had also been canceled in 1971, also in an attempt to purge the networks of older demographic-leaning programs.

During this transition period, which gradually eased the performance of more demanding " natural " brass writing, many composers ( notably Wagner and Berlioz ) still notated brass parts for the older " natural " instruments.

During 1823, he confirmed this, identifying the names of pharaohs Ramesses and Thutmose written in cartouches in far older hieroglyphic inscriptions that had been copied by Bankes at Abu Simbel and sent on to Champollion by Jean-Nicolas Huyot.

During the 1880s, when both the old cast-iron and modern forged-steel shrapnel shell designs were in British service, British ordnance manuals referred to the older cast-iron design as " Boxer shrapnel ", apparently to differentiate it from the modern steel design.

During the negotiations, the British also became aware of two older historical claims, the 1628 patent granted to the Earl of Carlisle ( which was inconsistent with Hunthum's title being sold to him by the Dutch West India company ), and an order of the King in 1694 to prevent foreign settlement in the Virgin Islands.

During the 1960s and 1970s, for instance, the show incorporated material by the contemporary sources The Beatles, Burt Bacharach and Hal David, The Everly Brothers and Paul Williams and so on, all redone in a format that was digestible to older viewers.

During Bill Oakley and Josh Weinstein's period as showrunners, they found that as they aged, Homer seemed to become older too, so they increased his age to 38.

During the absence of his older brother in Italy, Constantine was regent in Constantinople from 1437 – 1440.

During his stay there, he became friends with Iaseus: Pausanias describes a painting of Phocus giving his seal ring to Iaseus as a sign of friendship ; the author notes that Phocus is portrayed as a youth while Iaseus looks older and has a beard.

** During the 2005 season the tribes were initially divided up by age into " Old " and " Young ", with the old contestants being forty and older and the young contestants being under the age of thirty.

** During season 5 ( Pacific ) and season 6 ( Vanuatu ), the tribes were divided by age: older or younger than 31 years old.

During the 1970s, the 150 missile sites around the region ( 10 – 70 miles from the base ) were converted to Minuteman IIIs ; a model of the older Minuteman I stands at the Minot AFB main gate.

During his last years his favourite son Khosrau I had had great influence over him and had been proclaimed successor over his older brothers, Kawus ( Caoses ) and Zames.

During the reign of his older brother Theobald II he held the regency during many of Theobald's numerous absences and was declared heir by his childless brother, whom he succeeded in December 1270.

During this period it quickly took over from the older Radio Range system ( see below ).

During this period Rupert became closely involved in the development of the printmaking process of mezzotint, a method of ' negative ' printing which eventually superseded the older woodcut method of printmaking.

During the 9th and 10th centuries, the new lower-case writing hand of Minuscules came gradually to replace the older style.

During the latter part of the 20th century, owing more to wider social, cultural and political changes than the narrow fact of greater access to hanzi literacy, younger girls and women stopped learning Nüshu, and it began falling into disuse, as older users died.

During his twenties, Marc was involved in a number of stormy relationships, including a years-long affair with Annette von Eckardt, a married antique dealer who was nine years older than him.

During the 3-decade period of its dominant presence, the Bank played a major role in the growth of Pala town too, including using its influence to bring the Municipality, Catholic Diocese, St Thomas College and other institutions to Pala, beating the claims of some of the other bigger and older towns nearby.