Written in EnglishRead online
|The Physical Object|
Download South African pollen grains and spores.
Additional Physical Format: Online version: Zinderen Bakker, Eduard Meine van. South African pollen grains and spores. Amsterdam: A.A. Balkema, are not found in South Africa. Weeds pollinate in late summer and autumn. Fungal spores, or moulds, are usually sampled concur-rently with pollen grains, so that the pollen catch and fungal spore loads as well as their seasonal peaks, are noted for specific areas.
In most areas measured, the fungal spore load is highest in spring and autumn, but. The pollen morphology of 24 southern African species of Geranium L. (Geraniaceae) was studied. The pollen grains are tricolporate and prolate spheroidal. The exine structure is semitectate and reticulate with supratectal processes varying in size and morphology.
All the species have basically the same pollen by: 2. In the frame of the South African Pollen Network (SAPNET) the seasonal variation of the pollen and spores in South Africa is tested to help sufferers of allergies and to gather data for the impact.
Of these pollen types, are represented by only one pollen grain and a further by less than 20 grains (% of the grains counted). Only 89 pollen types contain 90% of the counted grains.
The most abundant pollen types in the African modern pollen samples are Gramineae and Cyperaceae, which together comprise 48% of the total pollen by: Whatever their function, these outstanding features of pollen-grain morphology may be commended to the attention of taxonomists. REFERENCES BARKER, E.
VAN Z. South African Pollen Grains and Spores. Part i. Amsterdam and Cape Town. ERDTMAN, G. An Introduction to Pollen Analysis. Waltham, Mass. ERDTMAN, G. South African pollen grains and spores. 88 pp. van Campo-Duplan, M. Recherches sur la phylogénie des Abietinées d’après leurs grains de pollen.
pp Recherches sur la phylogénie des Taxodiacées d’après leurs grains de pollen. Trav. Text-book of modern pollen analysis. Iversen, J. Landnam i. on modern pollen distribution in South Africa (Coetzee and van Zinderen Bakker, ).
Pollen morphological descriptions were pub-lished in the book series South African Pollen Grains and Spores (van Zinderen Bakker, b, ; van Zinderen Bakker and Coetzee, ; van Zinderen Bakker, ) and together with J.A.
Coetzee, he. Ground-breaking national pollen sampling by the UCT Lung Institute Allergy and Immunology Clinic This week’s figures from our national spore traps Pollen Counts Report Date: 30 October | Read the full report City Overall Risk Tree Pollen Grass Pollen Weed Pollen Mould Spores Cape Town Johannesburg Bloemfontein Durban Pretoria Port Elizabeth Kimberley This is.
Fungal spore loads seen so far in Durban have been the highest in the seven cities currently being monitored in South Africa. Picture: Supplied. High levels of mould and fungal spores. Thick accumulations of consolidated cow dung occur in ancientkraals (byres or corrals) in the bushveld and highveld areas of Zimbabwe, Botswana, and South Africa dating from the last years.
They originated from long-term cattle herding by Iron Age people. The “vitrified” or baked dung deposits are thought to be a product of the burning of cow dung as fuel, either for domestic purposes. Van Zinderen BEM () South African pollen grains and spores - Part II.
Balkema, Cape Town: ; Vishnu-Mittre () Pollen morphology of Indian Amaranthaceae. J Indian Bot Soc ; Wang FH () Pollen grains of China.: pp; Wang FH, Chang KT () Etude morphologique des pollens de Chine.
III. Mould spore counts of greater than 3, spores/m3 were found throughout the year and were only exceeded by pollen grains in the months of September and October (range 4, spores/m3).
Previously published Tertiary spore and pollen work in the region includes a description of some late Paleocene or Eocene species from Dandot, in Jhelum District, Punjab, by Vimal () and a description of many Paleocene spe-cies from northern and southern Pakistan by Frederiksen ().
In the present study of spores and pollen from the. Pretoria - Hay fever sufferers in Pretoria have been battling with runny noses and watery eyes as tree pollen levels surged to a daily average of 70 grains a cubic metre this spring.
Monitoring Team A dedicated team of South African scientists University of Cape Town Jonny Peter A/Prof Jonny Peter is Head of the Allergy and Clinical Immunology Division at Groote Schuur Hospital, and Head of the Allergy and Immunology Unit at the UCT Lung Institute.
He is the first HPCSA-registered Allergist with a base speciality of Monitoring Team Read More». Ragweed, which is a highly allergenic weed native to North America, has been detected in South African pollen spore traps for the first time.
The discovery was made by Dr Dilys Berman, an. Submitting Unknown Grains and Spores Submitting a Grain or Spore, University of Oxford Octo If you have pollen grains that you are having trouble identifying, whether modern or fossil, submit them to the global pollen project to crowd-source identifications.
Submitting a Grain or Spore, Step-By-Step. Viburnum pollen grain. (Viburnum rhytidophyllum). Anthurium sp. pollen. Lavendula dentata floret with close-up of pollen. Lavender. Eduard Meine van Zinderen Bakker (15 April Opsterland, Friesland – 19 March Somerset West) was a Dutch-born South African palynologist who made significant contributions to the fields of plant ecology, palynology and palaeo-ecology of Africa.
After obtaining a PhD in botany from the University of Amsterdam he taught biology in he emigrated to South Africa with. Most pollen grains consist of three distinct parts. The central cytoplasmic part is the source of nuclei responsible for fertilization. The other parts constituting the wall of the grain are an inner layer, the intine, and an outer layer, the intine consists, at least in part, of cellulose or outer and most durable layer, the exine, is very resistant to.
Photographs of pollen matched with the source plant: here is a sampling of our photomicrographs of pollen common in the various areas of the world. In this article are samples from our library of overphotographs of mold, pollen, allergens, and other airborne and forensic particles available in our bioaerosol laboratory.
Here are a few samples of some common pollen allergens and the. ALLERGIC POLLEN GRAINS OF INDIA. Major causative agents for allergic diseases like seasonal rhinitis, asthma, hay fever, atopic dermatitis and various kinds of bronchial troubles are pollen grains, fungal spores, dust mites, insect debris, animal epithelia, etc.
This week scientists made a landmark discovery when ragweed – a highly allergenic weed native to North America – was detected in South African pollen spore traps for the very first time. The discovery was made by Dr Dilys Berman, an aerobiologist at UCT and Prof Jonny Peter, who heads up the UCT Lung Institute’s Allergy Unit.
Pollen can be preserved for thousands of years in palaeontological and archaeological materials, thus providing a unique means of reconstructing the past. This is of particular interest to scientists given the current, intense interest in global climate change.
Varying minutely in size and detail, each grain can be identified by light and electron microscopy. Terrestrial plants produce extremely resistent spores and pollen which are easily transported by wind and water. Most fossil spore and pollen grains are studied in a dispersed state and this is the fundamental basis upon which Hyde and Williams () initially proposed the term Palynology.
the Beacon Sandstone of South Victoria Land, intercalated an obiter dictum on my unfortunate pollen-grain. " I agree," he wrote, "with Professor Walton in regarding the supposed spore, Pityosporites antarcticus, as merely a shrivelled pith-cell." The question whether or not my Antarctic spore is.
Ragweed pollen – a highly allergenic weed native to North America – was detected in South African pollen spore traps for the first time. Eradicating this invasive weed is critical as its fine pollen is highly allergenic, and it also poses a threat to crop health.
This interdisciplinary approach is known as aerobiology. The bioparticulates implicated to cause allergic symptoms are pollen grains, fungal spores, insect debris, house dust mites, animal dander, chemicals, foods, etc . Among all these agents, pollen grains and fungal spores are the most predominant allergens in the air.
The selection of skin-prick and ImmunoCAP radioallergosorbent test (RAST) testing panels for tree, grass, weed and fungal spore aeroallergens is an easier task when pollen and fungal spore levels for the particular geographic area are accessible to the allergologist.
In South Africa, long-term pollen and fungal spore level information exists for the Western Cape, where several areas in the. To extend our findings with sunflower pollen grains, we also tested pollen grains and spores from flowering monocots (cattail), gymnosperms (pine), and spore.
Cross-section of the cell wall (structure) of a pollen grain and a spore. In: G. Lang,S. The structure of both Pteridophyte and Bryophyte spores is very similar to pollen.
They also possess a sporopollenin cell wall consisting of several layers. The inner layers are the endospore and exospore, the outer layer, which often "peels off.
“Weed control boards should add it to their invasive weeds list as soon as possible” SCIENTISTS this week made a landmark discovery when ragweed, a highly allergenic weed native to North America, was detected in South African pollen spore traps for the first time.
The discovery was made by UCT aerobiologist Dr Dilys Berman and [ ]. Pollen grains will absorb some of the fuchsin stain, a magenta colored dye, and this stains the outer wall of the pollen grains a pink to magenta color. At X magnification any pollen grains are readily visible and can be counted and identified.
A portion of the slide is examined and the numbers and types of pollen grains determined. This interdisciplinary approach is known as aerobiology. The bioparticulates implicated to cause allergic symptoms are pollen grains, fungal spores, insect debris, house dust mites, animal dander, chemicals, foods, etc .
Among all these agents, pollen grains and fungal spores are the most predominant allergens in the air. Palynology is the general study of minute particles including pollen from the air, water or sedimentary deposits. Melissopalynology is the specific study of pollen in honey, which is usually what beekeepers are interested in.
Each species, or sub-species of plant, has a distinctive shape and structure to its pollen grains. The discovery of the microscope by Robert Hooke in was a landmark in the development of science, particularly palynology. Subsequent improvement in microscopy accelerated the study of pollen grains, especially the finer structure of the pollen wall and its myriad ornamentation patterns.
Pollen is ubiquitous in nature unlike other plant parts. There are numerous websites that forecast pollen and fungal spore levels in the air in South African cities, but they are largely ’fake pollen counts’ and may misinform the public.
Many of these websites make inaccurate predictions or include plants like ragweed that are not found in abundance in South Africa and have not so far been seen. Continued rain removed pollen and fungal spores from the air but fungal spores surged during days with some sun.
(grains per cubic metres of air) Health24 is South Africa. The Smithsonian Tropical Research Institute in Panama was recently given a collection of more t different pollen grains and spores, each mounted on a microscope slide and labeled according to the plant that produced it. “The collection is worldwide in coverage with an emphasis on plants of the Americas,” explains collection donor Alan Graham, professor emeritus at Kent State.
Introduction. The tribe Vernonieae is notable for remarkable variations in pollen structure, variations in sublophate and lophate forms with varying degrees of reduced perforated tectum in the exine and variations in the attachments of the outer exine to the footlayer.
Now a new variation has been encountered during a study of South African Vernonieae that involves the first known examples of.Weed pollens (English plantain and Cosmos) rise for a short “spell” in late summer and fungal or mould spores (Alternaria, Cladosporium and Epicoccum) predominate in damp Spring and Autumn but tend to be less problematic than pollen grains unless spore counts exceed per cubic meter.
In South Africa we rarely see the Silver Birch tree. 1)pollen grain is a male gamete while a spore may be produced due to fusion of gametes or it can also be vegetative.
2)pollen grains are haploid while spores can be haploid or diploid depending on the plant producing them. 3)pollen grain is a characteristic of higher plants while spore formation takes place in lower plants as well as fungi.