Last Update: Wednesday, July 23, 2014

A Purrfect Flower for Winter? Try the Catkin PDF Print E-mail
Written by LEE REICH   
Thursday, 03 February 2011 07:38

Plant lovers and feline lovers unite: Some catkins have come out. And are they a welcome sight, being pretty much the only sign of plant activity outdoors this time of year.

Okay, I admit the feline part is a stretch. The "cat" in "catkin" comes merely from the way the catkins droop or poke up from stems like the furry tails of cats.

For those unfamiliar with catkins, allow me to make the introductions. A catkin is a long cluster of very small flowers, none of which have petals. While many flowers have both male and female parts, catkins are unisexual, either male or female.

Catkins are common among trees and shrubs native to temperate climates. The ones catching my eye this month were dangling from the stems of my filbert trees. These are male catkins so, in time, will be shedding pollen - and plenty of it. A single walnut catkin, for example, releases about two million pollen grains.

The reason for those copious amounts is that trees and shrubs with catkins are pollinated by the wind, and wind is a relatively inefficient way to transport pollen. Wind can carry pollen only a few hundred feet, and then it's mostly hit or miss whether that pollen lands on a receptive female flower.

Contrast this with insect pollination, where pollen might be carried many miles and then to a specific kind of flower. Insect pollination is much more common in the tropics, and representatives of wind-pollinated, temperate-climate plants typically become insect-pollinated when they evolve in the tropics.

All this pollen does cast a slight cloud over these plants. Some people are allergic to the pollen - the first outdoor allergen of the season. Don't worry yet, though; the catkins are only now expanding and have yet to spread their magic powder about.


Team members care for thousands of the region's sickest children with heart conditions, including fetuses, newborns, infants, children, adolescents, and adult, long-term patients with pediatric cardiovascular conditions. At Children's families experience coordinated, next-generation care, delivered by a compassionate, multidisciplinary team of leaders in the pediatric cardiology field. One of the largest pediatric cardiovascular programs in the region. Studies have shown that high volumes are associated with high quality and better outcomes, because experience is a major factor in quality of care. Wort was traditionally prescribed in parts of Europe for depression (in addition to use as a general-purpose tea), and Chinese medicine developed elaborate lists of herbs and preparations. With the scientific revolution in Europe and the United States, the use of traditional herbal remedies fell out of favor with the mainstream medical establishment, although a few people continued to use and maintain knowledge of traditional European herblore. In the early 20th century, scientists began reassessing this rejection of traditional herbs in medicine. Vorzüge eines intakten und lebendigen Gemeinschaftslebens bewahren. Dafür sorgen nicht zuletzt gut 120 lokale Vereine. Als wichtiger Faktor im Kulturleben haben sich die zahlreichen Museen und einige Kunstgalerien erwiesen. Descriptive and quantitative transcriptome analyses are important for interpreting the functional elements of the genome and revealing the molecular constituents of cells and tissues. It is known that sperm function can be affected by ASG proteins, including the processes of capacitation and the acrosome reaction, as well as canadian pharmacy accutane sperm motility, DNA integrity and interaction with the oocyte. BSPs (bovine seminal plasma protein, unigene 64,588 and unigene 69,768), fertilin (unigene 17,270 and unigene 27,136), ACE (Angiotensin converting enzyme, unigene 7,164 and unigene 21,069), GPX5 (glutathione peroxidase, epididymal secretory glutathione peroxidase, unigene15860), Spermadhesin-1 (Acidic seminal fluid protein, aSFP). The reproduction-related transcripts identified in the ASG and testis transcritptomes in E. This interaction of PDC-109 with the sperm cell membrane results in an efflux of cholesterol and choline phospholipids, that appears to be important for capacitation. The main changes in spermatozoa that occur during epididymal maturation are the ability to move, recognize and bind to the ZP, and to fuse with the plasma membrane of the oocyte.. Oct 2004, Adelaide, Australia. Ziaian T, Augostinos, M. Relationship Between Acculturation and Mental Well-being Among Young Persian Women Living in Australia. Paper presented at the Educational Research conference, 18th November 2004, Adelaide, Australia. Ziaian T, Stress Management: an introduction of holistic coping strategies. A Four day Course for the higher degree students. Targeted molecular therapy for advanced epithelial ovarian cancer. Minimally invasive surgery for gynecological cancer. Pharmaceutical Sciences from Shizuoka College of Pharmacy (1976, Japan). He has completed his B. Prophylactic removal of nevi without clinically worrisome characteristics is not recommended. The reasons for this are practical: many individuals in these families have a large number of nevi, and complete removal of them all is not feasible, since new atypical nevi continue to develop. In addition, individuals with increased susceptibility to melanoma may have cancer arise de novo, without a precursor lesion such as a nevus. The disadvantages of screening include the limitations of available noninvasive testing methods and the risks associated with invasive screening procedures. ERCP is the gold standard for identifying early cancers and precancerous lesions in the pancreas..