Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Pollination”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 469 records · Page 26Linked to original sources
PubMed2006

The extracellular pollen coat in members of the Brassicaceae: composition, biosynthesis, and functions in pollination.

I have used cellular and molecular genetic and bioinformatic approaches to characterise the components of the pollen coat in plants of the family Brassicaceae, including Arabidopsis thaliana and several brassicas including Brassica napus, B. oleracea, and B. rapa. The pollen coat in these species is mostly made up of a unique mixture of lipids that is highly enriched in acylated compounds, such as sterol esters and phospholipids. These acyl lipids are characterised by an unusually high degree of saturation. The fatty acids typically contain 70-90% saturated acyl residues such as myristate, palmitate, and stearate. The major sterol components of the pollen coat are saturated fatty acyl esters of stigmasterol, campesterol, and campestdienol. In addition to lipids, the second major component of the pollen coat is a specific group of proteins that is dominated by a family of proteins that we term pollenins. Although pollenins are by far the major protein components of the pollen coat of members of the Brassicaceae, proteomic analysis reveals that there are several additional protein components, including lipases, protein kinases, a pectin esterase, and a caleosin. The biosynthesis of these lipids and proteins and their significance for overall pollen function are reviewed and discussed.

Brassicaceae↗
PubMed1992

The need for multidisciplinary training in counseling the medically ill. Report of the training committee of the Linda Pollin Foundation.

Training for medical counselors requires that medicine and psychiatry give up the position that counseling is only a negligible offshoot that almost any professional can readily do. Instead, counseling can be considered a generic concept that covers a wide variety of interventions designed to help patients cope with the complications and consequences of their chronic illness. This report outlines the principles and scope of training for consideration in the area of counseling the medically ill and reviews the current status of training programs in the fields of psychiatry, psychology, social work, and nursing. Recommendations are made for future directions, including role clarification for disciplines, building a credible research base, provision of guidelines and possible accreditation, and incorporating medical counseling into training fellowships.

Chronic Disease↗
PubMed2005

[Palynological evidence of anthropogenic pressure: effect on pollination dynamics in the Evian area since the middle Neolithic: the pollen record of La Beunaz (971 m a.s.l., northern Alps, France)].

This paper presents a pollen diagram from La Beunaz peat-bog (southeast of Evian, Haute-Savoie, France), which provides the first detailed record of human impact on vegetation of the southern bank of Lake Geneva since the Middle Neolithic. The radiocarbon-dated pollen profile is correlated with micro-charcoal record and archaeological data. The results suggest that several phases of deforestations since 4615+75/-70 years BP occurred, in relation to human activities (agriculture, pastoralism). Tombs and vestiges of lacustrine villages indicate that the region was intensively and recurrently occupied by man during at that time.

Carbon Radioisotopes↗
PubMed1975

Maximal rise in IgE antibody following ragweed pollination season.

Patients allergic to ragweed pollen who did not receive immunotherapy had an increase in ragweed-specific IgE antibodies associated with seasonal exposure. Of 17 such patients, 15 reached peak levels between mid-September and mid-October. Two had peak values after mid-October; the levels were only slightly higher than earlier values. Our study shows that serum obtained in mid-October reflects approximately the maximal IgE antibody level attained 0y ragweed-sensitive patients in our area and that this value can be used as a baseline in monitoring the subsequent decline in antibodies. In addition, our data support an earlier observation that the magnitude of seasonal rise in IgE antibody is related to the preseasonal value. The significantly positive correlation of the results of carefully performed skin tests (end point titration) with radioallergosorbent test (RAST) values suggests the possibility that the RAST can be employed as a reliable diagnostic aid, perhaps even replacing the skin test.

Adolescent↗
PubMed2000

Leaf morphology and ozone sensitivity of two open pollinated genotypes of black cherry (Prunus serotina) seedlings.

Two black cherry families differing in sensitivity to ozone (O(3)) were used to test the hypothesis that leaf morphology is related to foliar sensitivity to O(3). Two uninjured sections of leaf tissue were sampled from a single leaf collected from each of 12 open-grown O(3)-tolerant and 12 O(3)-sensitive seedlings. Standard histological techniques and light microscopy were used to examine 11 morphological characteristics. The O(3)-sensitive genotype had significantly greater stomatal density, thinner palisade mesophyll layer and thicker spongy mesophyll layer, lower ratio of palisade to spongy mesophyll, greater leaf weight and leaf area. In addition, total leaf thickness, guard cell length, and specific leaf mass were also slightly greater for the O(3)-sensitive genotype.

Journal Article↗
PubMed1999

Signaling in pollination.

The past year has seen considerable advances in our understanding of signaling in pollen tubes. Evidence suggesting that lipids are involved in pollen tube guidance has opened up new avenues. Major advances have been made in understanding the roles of Rho-like GTPases and protein kinases in regulating pollen tube growth. Light is being shed on how signals may be integrated. It is becoming clear that the role of Ca(2+) in pollen tube growth is perhaps more complex than originally anticipated.

Plant Cells↗
PubMed2004

The chemistry of pollination in selected Brazilian Maxillariinae orchids: floral rewards and fragrance.

We report the chemical composition of the floral rewards and the fragrance of 10 Maxillariinae (Orchidaceae) species. The species that offer rewards (labellar secretions) are usually scentless, the rewards being collected by bees. Chemical analyses revealed that the major chemical class of compounds present in the labellar secretions are triterpenoids. The rewardless Maxillariinae flowers were usually scented, and chemical analyses of their volatiles revealed that they were composed of mono and sesquiterpenoids.

Animals↗