Air emission monitoring, vapour control and public communications during MGP site excavation in close proximity to neighbours

Microtubules (MT) are versatile organelles participating in a wide variety of biological activity. MT involvement in the movement and transport of cytoplasmic components has been well documented. In the course of our study on trauma-induced vasogenic edema in the spinal cord we have concluded that endothelial vesicles contribute to the edema process. Using horseradish peroxidase as a vascular tracer, labeled endothelial vesicles were present in all situations expected if a vesicular transport mechanism was in operation. Frequently,labeled vesicles coalesced to form channels that appeared to traverse the endothelium. The presence of MT in close proximity to labeled vesicles sugg ested that MT may play a role in vesicular activity.

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Experiments with a scanning tunneling microscope (STM) mounted in a scanning electron microscope (SEM)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144620 ◽

1986 ◽

Vol 44 ◽

pp. 636-639

Author(s):

Oliver C. Wells ◽

Mark E. Welland

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Mechanical Stability ◽

Tunneling Current ◽

Feedback System ◽

Scanning Tunneling ◽

Surface Profiling ◽

Close Proximity ◽

Metal Tip ◽

Scanning Electron

Scanning tunneling microscopes (STM) exist in two versions. In both of these, a pointed metal tip is scanned in close proximity to the specimen surface by means of three piezos. The distance of the tip from the sample is controlled by a feedback system to give a constant tunneling current between the tip and the sample. In the low-end STM, the system has a mechanical stability and a noise level to give a vertical resolution of between 0.1 nm and 1.0 nm. The atomic resolution STM can show individual atoms on the surface of the specimen.A low-end STM has been put into the specimen chamber of a scanning electron microscope (SEM). The first objective was to investigate technological problems such as surface profiling. The second objective was for exploratory studies. This second objective has already been achieved by showing that the STM can be used to study trapping sites in SiO2.

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Ultrastructure and Senescence in an Achloroplastic Mutant of Hordeum vulgare L. cv. Dyan

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100124628 ◽

1992 ◽

Vol 50 (1) ◽

pp. 844-845

Author(s):

R.H.M. Cross ◽

C.E.J. Botha ◽

A.K. Cowan ◽

B.J. Hartley

Keyword(s):

Cell Wall ◽

Hordeum Vulgare ◽

Leaf Tissue ◽

Ultrastructural Changes ◽

Hordeum Vulgare L ◽

Mesophyll Cells ◽

Lethal Mutant ◽

Cytoplasmic Matrix ◽

Close Proximity ◽

Pinocytotic Vesicles

Senescence is an ordered degenerative process leading to death of individual cells, organs and organisms. The detection of a conditional lethal mutant (achloroplastic) of Hordeum vulgare has enabled us to investigate ultrastructural changes occurring in leaf tissue during foliar senescence.Examination of the tonoplast structure in six and 14 day-old mutant tissue revealed a progressive degeneration and disappearance of the membrane, apparently starting by day six in the vicinity of the mitochondria associated with the degenerating proplastid (Fig. 1.) where neither of the plastid membrane leaflets is evident (arrows, Fig. 1.). At this stage there was evidence that the mitochondrial membranes were undergoing retrogressive changes, coupled with disorganization of cristae (Fig. 2.). Proplastids (P) lack definitive prolamellar bodies. The cytoplasmic matrix is largely agranular, with few endoplasmic reticulum (ER) cisternae or polyribosomal aggregates. Interestingly, large numbers of actively-budding dictysomes, associated with pinocytotic vesicles, were observed in close proximity to the plasmalemma of mesophyll cells (Fig. 3.). By day 14 however, mesophyll cells showed almost complete breakdown of subcellular organelle structure (Fig. 4.), and further evidence for the breakdown of the tonoplast. The final stage of senescence is characterized by the solubilization of the cell wall due to expression and activity of polygalacturonase and/or cellulose. The presence of dictyosomes with associated pinocytotic vesicles formed from the mature face, in close proximity to both the plasmalemma and the cell wall, would appear to support the model proposed by Christopherson for the secretion of cellulase. This pathway of synthesis is typical for secretory glycoproteins.

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685 Ice mapping during tachycardia in close proximity to the AV node is safe and offers advantages for transcatheter ablation procedures

EP Europace ◽

10.1016/s1099-5129(05)80476-3 ◽

2005 ◽

Vol 7 ◽

pp. 161-161

Keyword(s):

Av Node ◽

Close Proximity

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Florida Fertilizer Usage Statistics

EDIS ◽

10.32473/edis-ep541-2017 ◽

2017 ◽

Vol 2017 (3) ◽

pp. 3

Author(s):

Travis W. Shaddox ◽

Joseph Bryan Unruh

Keyword(s):

Water Bodies ◽

Policy Makers ◽

Fact Sheet ◽

Close Proximity

Nutrient applications are often required to meet Florida’s demand for agricultural and horticultural commodities, but often those applications occur in close proximity to water bodies. In order for scientists, policy makers, and citizens to make decisions regarding nutrient issues in Florida, it is important to first understand which markets contribute to Florida’s fertilizer consumption. This three-page fact sheet explains Florida’s fertilizer usage statistics. Written by T.W.Shaddox and published by the Environmental Horticulture Department.http://edis.ifas.ufl.edu/ep541

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Reframing Xenophobia in South Africa as Colour-Blind: The Limits of the Afro Phobia Thesis

MIGRATION LETTERS ◽

10.33182/ml.v17i3.789 ◽

2020 ◽

Vol 17 (3) ◽

pp. 433-444

Author(s):

Amanuel Isak Tewolde

Keyword(s):

South Africa ◽

South African ◽

Analytical Framework ◽

Conflict Theory ◽

Black African ◽

South Africans ◽

Theoretical Perspectives ◽

Online Newspaper ◽

Close Proximity ◽

Realistic Conflict Theory

Many scholars and South African politicians characterize the widespread anti-foreigner sentiment and violence in South Africa as dislike against migrants and refugees of African origin which they named ‘Afro-phobia’. Drawing on online newspaper reports and academic sources, this paper rejects the Afro-phobia thesis and argues that other non-African migrants such as Asians (Pakistanis, Indians, Bangladeshis and Chinese) are also on the receiving end of xenophobia in post-apartheid South Africa. I contend that any ‘outsider’ (White, Asian or Black African) who lives and trades in South African townships and informal settlements is scapegoated and attacked. I term this phenomenon ‘colour-blind xenophobia’. By proposing this analytical framework and integrating two theoretical perspectives — proximity-based ‘Realistic Conflict Theory (RCT)’ and Neocosmos’ exclusivist citizenship model — I contend that xenophobia in South Africa targets those who are in close proximity to disadvantaged Black South Africans and who are deemed outsiders (e.g., Asian, African even White residents and traders) and reject arguments that describe xenophobia in South Africa as targeting Black African refugees and migrants.

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