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Pollen tubes are an excellent model for the understanding of plant cell behavior. [19] They are easily cultivated in vitro and have a very dynamic cytoskeleton that polymerizes at very high rates, providing the pollen tube with interesting mechanical properties. [20] The pollen tube has an unusual kind of growth; it extends exclusively at its apex.
The style is a hollow tube in some plants, such as lilies, or has transmitting tissue through which the pollen tubes grow. [15] The stigma (from Ancient Greek στίγμα, stigma, meaning mark or puncture) is usually found at the tip of the style, the portion of the carpel(s) that receives pollen (male gametophytes). It is commonly sticky or ...
Gonorrhea can spread into the uterus and fallopian tubes, causing pelvic inflammatory disease (PID). PID can result in scarring of the tubes, greater risk of pregnancy complications and infertility, and can be fatal, particularly in the immunocompromised. [citation needed] PID requires immediate treatment. Infertility in men.
Pollen itself is not the male gamete. [4] It is a gametophyte, something that could be considered an entire organism, which then produces the male gamete.Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell.
7.6% of children and 10.8% of adults. [140] Peanut and/or tree nut (e.g. walnut) allergy affects about three million Americans, or 1.1% of the population. [138] 5–7% of infants and 1–2% of adults. A 117.3% increase in peanut allergies was observed from 2001 to 2005, an estimated 25,700 people in England are affected.
For example, people allergic to birch pollen may also find that they have an allergic reaction to the skin of apples or potatoes. [23] A clear sign of this is the occurrence of an itchy throat after eating an apple or sneezing when peeling potatoes or apples. This occurs because of similarities in the proteins of the pollen and the food. [24]
Endometriosis can lead to ovarian cysts (endometriomas), adhesions, and damage to the fallopian tubes or ovaries, all of which can interfere with ovulation and fertilization. Treatment for endometriosis often includes hormonal therapies, pain management, and in some cases, surgery to remove the endometrial tissue.
OAS must be managed in conjunction with the patient's other allergies, primarily the allergy to pollen. The symptom severity may wax and wane with the pollen levels. Published pollen counts and seasonal charts are useful but may be ineffective in cases of high wind or unusual weather, as pollen can travel hundreds of kilometers from other areas.