scholarly journals Sandstone Geomorphology of South-West Jordan, Middle East

2014 ◽  
Vol 33 (3) ◽  
pp. 123-130 ◽  
Author(s):  
Piotr Migoń ◽  
Andrew Goudie
Keyword(s):  
Middle East ◽  
Southern China ◽  
Rock Slopes ◽  
Desert Environment ◽  
Rock Falls ◽  
Danxia Landform ◽  
South West ◽  
Central Sahara ◽  
Morphological Differences ◽  
Rock Slides

AbstractIn the desert environment of south-west Jordan thick sequences of continental sandstones of Cambrian-Ordovician age support spectacular scenery, comparable with that of the Colorado Plateau of south-west USA or the central Sahara and similar in many aspects to the Danxia landform of southern China. Dissection of a sandstone tableland has given rise to numerous inselbergs and large mesas, rising from the sand-covered desert floor. The height of the hills varies from a few tens to 500-700 m in the Wadi Rum area, whereas their slope shapes are controlled by lithological properties of particular sandstone units. Rock walls of the sandstone inselbergs are subject to frequent rock falls and rock slides and host an impressive array of tafoni and honeycombs due to selective weathering, as well as a number of rock arches. Lithological differences within the sandstone sequence are crucial controls on the shape and evolution of rock slopes, exerting the influence via contrasting patterns of weathering and slope failures. The presence of ferruginous layers in the Umm ‘Ishrin Sandstone is of major importance and explains the fundamental morphological differences between the otherwise similar Umm ‘Ishrin and Disi sandstone units

Changing Places: Rock Art and Holocene Landscapes in the Wadi al-Ajal, South-West Libya

2014 ◽  
Vol 12 (2) ◽  
pp. 165-182 ◽  
Author(s):  
Tertia Barnett ◽  
Maria Guagnin
Keyword(s):  
Spatial Analysis ◽  
Surface Water ◽  
Rock Art ◽  
Human Settlement ◽  
Gis Model ◽  
South West ◽  
Settlement Location ◽  
Central Sahara ◽  
The Relationship ◽  
Over Time

This article examines the relationship between rock art and landscape use by pastoral groups and early settled communities in the central Sahara from around 6000 BC to 1000 AD. During this period the region experienced significant climatic and environmental fluctuations. Using new results from a systematic survey in the Wadi al-Ajal, south-west Libya, our research combines data from over 2000 engraved rock art panels with local archaeological and palaeoenvironmental evidence within a GIS model. Spatial analysis of these data indicates a correspondence between the frequency of rock art sites and human settlement over time. However, while changes in settlement location were guided primarily by the constraints on accessibility imposed by surface water, the distribution of rock art relates to the availability of pasture and patterns of movement through the landscape. Although the reasons for these movements undoubtedly altered over time, natural routes that connected the Wadi al-Ajal and areas to the south continued to be a focus for carvings over several thousand years.

Grammothele hainanensis sp. nov. (Polyporales, Basidiomycota) and related species from Hainan, southern China

Phytotaxa ◽  
2016 ◽  
Vol 255 (2) ◽  
pp. 160 ◽  
Author(s):  
FANG WU ◽  
LI-WEI ZHOU ◽  
XIAO-HONG JI ◽  
XUE-MEI TIAN ◽  
SHUANG-HUI HE
Keyword(s):  
New Species ◽  
Related Species ◽  
Southern China ◽  
Pore Surface ◽  
Corticioid Fungi ◽  
Hyphal System ◽  
The Core ◽  
Phylogenetic Perspective ◽  
Thin Walled ◽  
Morphological Differences

Grammothele and Theleporus have a shallow pore surface, which makes them morphologically close to corticioid fungi. However, from a phylogenetic perspective, they are polyphyletic genera within the core polyporoid clade of the Polyporales. Eight specimens with a shallow pore surface from Hainan, southern China, were morphologically and phylogenetically studied. Among them, one was determined as Grammothele denticulata, four were identified as Theleporus membranaceus, and three are described as Grammothele hainanensis. G. hainanensis is characterized by the annual and resupinate basidiocarps with poroid to irpicoid hymenophore, a dimitic hyphal system with clamped generative hyphae and weakly dextrinoid skeletal hyphae, the presence of cystidioles, hyphal pegs and dendrohyphidia, and cylindrical, hyaline and thin-walled basidiospores. It is closely related to G. quercina in phylogeny. Morphologically, G. quercina differs in producing perennial basidiocarps with cream to pale greyish and larger pores. The morphological differences among the new species and other species were analyzed.

δ-tocotrienol induce nasopharyngeal carcinoma apoptosis and Growth arrest in the CNE1 cells

2021 ◽  
Author(s):  
Junjun Shen ◽  
Tao Yang ◽  
Yiping Tang ◽  
Tianyi Guo ◽  
Ting Guo ◽  
...  
Keyword(s):  
Nasopharyngeal Carcinoma ◽  
Middle East ◽  
Southeast Asia ◽  
Incidence Rate ◽  
North Africa ◽  
Southern China ◽  
Growth Arrest ◽  
The Arctic ◽  
High Incidence ◽  
High Incidence Rate

Nasopharyngeal carcinoma has a notably high incidence rate in Southern China, Southeast Asia, North Africa, Middle East, and the Arctic. δ-tocotrienol is abundant in cereal and has some health benefits....

Africa—Latin America—Asia—Middle East—Europe

1982 ◽  
Vol 22 (229) ◽  
pp. 222-239
Keyword(s):  
Latin America ◽  
Middle East ◽  
West Africa ◽  
East Europe ◽  
South West ◽  
South West Africa

In June, the delegate general for Africa, Mr. Jean-Marc Bornet, visited Namibia/South West Africa, Sudan and Ethiopia, to discuss current activities with the ICRC delegations in those three countries.

Australia's wasp-pollinated flying duck orchids revised (Paracaleana: Orchidaceae)

2006 ◽  
Vol 19 (3) ◽  
pp. 211 ◽  
Author(s):  
Stephen D. Hopper ◽  
Andrew P. Brown
Keyword(s):  
Sequence Data ◽  
South Australia ◽  
Pollination Syndrome ◽  
The South ◽  
Geographical Differences ◽  
Sexual Deception ◽  
Dna Sequence Data ◽  
South West ◽  
Morphological Differences ◽  
Putative Hybrids

We uphold the generic rank of Paracaleana on the basis of its divergent pollination syndrome (sexual deception of male thynnid wasps compared with pollination of Caleana by male sawflies), recent DNA sequence data demonstrating monophyly, and nomenclatural stability. Ten of the 13 species recognised herein are new, all endemic to the South-west Australian Floristic Region: Paracaleana alcockii, P. brockmanii, P. dixonii, P. gracilicordata, P. granitica, P. hortiorum, P. lyonsii, P. parvula, P. terminalis and P. triens. Although some of these taxa have subtle morphological differences, primarily of labellum morphology, evidence from other Australian orchid genera whose flowers sexually deceive wasp pollinators indicates that reproductive isolation is probable among close sister taxa in Paracaleana. Moreover, phenological, ecological and geographical differences help separate morphologically close sister taxa. P. disjuncta D.L. Jones is considered to extend from Victoria and South Australia west into the South-west Australian Floristic Region, where James Drummond first collected the species, probably in 1838. Additional research is needed on pollinators, molecular phylogeny, possibly undescribed taxa within P. nigrita and on the few putative hybrids identified in the genus.

Magnitude and frequency of rock falls and rock slides along the main transportation corridors of southwestern British Columbia

1999 ◽  
Vol 36 (2) ◽  
pp. 224-238 ◽  
Author(s):  
O Hungr ◽  
S G Evans ◽  
J Hazzard
Keyword(s):  
British Columbia ◽  
Rock Slope ◽  
Sampling Procedure ◽  
Rock Fall ◽  
Rock Falls ◽  
Geological Conditions ◽  
Transportation Corridors ◽  
Risk Magnitude ◽  
Frequency Relationship ◽  
Rock Slides

The two main transportation corridors of southwestern British Columbia are subject to a range of rock slope movements (rock falls, rock slides, and rock avalanches) that pose significant risks to road and rail traffic travelling through the region. Volumes of these landslides range from less than 1 m3 to over 4.0 × 107 m3. A database of rock falls and slides was compiled for rail and highway routes in each transportation corridor using maintenance records spanning four decades. The records number approximately 3500, of which about one half includes information on volume. Magnitude - cumulative frequency (MCF) relationships were derived for each corridor. A scaled sampling procedure was used in part to reduce the effects of censoring. Both corridors yield MCF curves with significant linear segments on log-log plots at magnitudes greater than 1 m3. The form of both railway and road plots for each corridor shows similarity over several orders of magnitude. The slope of the linear segments of the curves depends on geological conditions in the corridors. Temporal histograms of the data show a trend towards reduction of rock fall frequency as a result of rock slope stabilization measures, implemented during the 1980s and 1990s. A risk analysis methodology using the slope of the magnitude-frequency relationship is outlined. The major part of the risk to life in the case examined results from rock falls in the intermediate-magnitude range (1-10 m3).Key words: rock fall, rock slide, landslide hazard, risk, magnitude-frequency, British Columbia.

Foraging in the limpet Patella vulgata: the influence of rock slope on the timing of activity

1999 ◽  
Vol 79 (5) ◽  
pp. 881-890 ◽  
Author(s):  
Gray A. Williams ◽  
Colin Little ◽  
David Morritt ◽  
Penny Stirling ◽  
Linda Teagle ◽  
...  
Keyword(s):  
Rock Slope ◽  
Large Degree ◽  
Head Orientation ◽  
Rock Slopes ◽  
Short Term ◽  
Patella Vulgata ◽  
South West ◽  
Steep Slopes ◽  
Lough Hyne

Preliminary observations of limpet activity at Lough Hyne, in south-west Ireland, showed that individuals on steep slopes were primarily active at night, when emersed; while those on near-horizontal rocks were often active during daytime submersion. Observations of limpet populations over an 11 d period of limpet populations on a near-vertical and a near-horizontal site, only 45 m apart, confirmed that animals on the near-vertical site were active on nocturnal low tides, whilst those on the near-horizontal site were active on daytime high waters. A short-term survey at ten sites, which had limpets on both extremes of slope (i.e. either near-vertical or near-horizontal), showed that limpets on near-horizontal surfaces were, on average, more active at daytime high waters than those on near-vertical faces. In 1996 and 1997 surveys of activity at daytime high, and nocturnal low waters were conducted at sites (14–15) with varying rock slopes (∼3–87°). In all cases, limpets on more steep slopes were active at nocturnal emersion whilst animals on more gentle slopes were active on daytime submersion periods. In most cases these trends were significant and explained between 22–40% and 37–44% of the variation in activity with site in 1996 and 1997 respectively. Analysis of the head orientation of limpets on their home scars showed that animals orientated in a down shore direction at all sites (1997 data) suggesting that limpets do perceive and respond to slope. Whilst slope does appear to influence the timing of limpets' activity (and especially on very steep or gently sloping sites) it does not account for a large degree of the variation in activity and, on sites with slopes between 30 and 60°, is likely to work in combination with other factors.

Centres of Plant Diversity. A Guide and Strategy for Their Conservation. Volume 1-Europe, Africa, South West Asia and the Middle East.

1996 ◽  
Vol 3 (1) ◽  
pp. 36
Author(s):  
Rachel Quinn ◽  
S. D. Davis ◽  
V. H. Heywood ◽  
A. C. Hamilton
Keyword(s):  
Middle East ◽  
Plant Diversity ◽  
South West

General Assembly

1969 ◽  
Vol 23 (1) ◽  
pp. 167-190 ◽  
Keyword(s):  
Middle East ◽  
West Africa ◽  
United Nations ◽  
General Assembly ◽  
Plenary Meeting ◽  
South West ◽  
South West Africa

Resuming its 22nd session at United Nations Headquarters on April 24, 1968, the General Assembly held its 1643rd–1672nd plenary meetings drought June 12, 1968. The session was formally closed at the 1673rd plenary meeting, held on September 23, 1968. The Assembly agreed without objection to a procedure outlined by its President, Cornelia Manes cu (Rumania), under which the First (Political and Security) Committee would discuss the report submitted by the Conference of the Eighteen-Nation Committee on Disarmament (ENDC) concerning its negotiations on a nonproliferation treaty while the plenary considered the question of South West Africa. Also on the agenda was the situation in the Middle East.

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