The Underground Waters of North-West Yorkshire. Part I. The Sources of the River Aire

1900 ◽  
Vol 14 (1) ◽  
pp. 1-44 ◽  
Keyword(s):  
North West ◽  
Underground Waters

scholarly journals Evaluation De L’impact De La Pollution Agricole Sur La Qualite Des Eaux Souterraines De La Nappe Du Gharb

2016 ◽  
Vol 12 (11) ◽  
pp. 509 ◽  
Author(s):  
Bouderka Nouzha ◽  
Souid Ahmed Kacem ◽  
Lakhili Ferdaouss ◽  
Lahrach Abrerrahim ◽  
Benabdelhadi Mohammed
Keyword(s):  
Underground Water ◽  
Sodium Potassium ◽  
North West ◽  
Underground Waters ◽  
The North ◽  
Physico Chemical ◽  
Eaux Souterraines ◽  
The Impact ◽  
Metallic Contamination

The Gharb plain is located in the North West of Morocco and corresponds to a vast plain of the Sebou watershed. It includes an irrigable perimeter of a 250,000 ha, of which more than 120,000 ha are designed as big hydraulics to meet the drinking water and irrigation needs of the region. The intensification of agriculture in this region leads to a significant use of phytosanitary products, which can impact the physico-chemical quality of the Gharb groundwater. To assess this quality we proceeded to the analysis of the physico-chemical parameters (pH, electric conductivity, dissolved oxygen, chlorides, sodium, potassium, nitrates, ammonium, and orthophosphates) and the study of the metallic contamination of waters of 17 wells located in the region of Sidi Kacem-Sidi Slimane. The results of performed analysis, revealed a pollution of an agricultural origin. This is confirmed by the maximum levels of chlorides, which exceed 2,734 mg/l, thereby explaining the high conductivity levels (5000 μ/cm). Nevertheless, a lithological influence cannot be excluded. The nitrate levels (160 mg/l) indicate a nitric pollution of underground waters. The heavy metals measured showed a metallic contamination exceeding the norms of lead and aluminium concentration, elements which may have their origin in fertilizers undergoing an excessive use in the area. These results confirm the impact of the agricultural intensification in the degradation of the quality of the underground water of the Gharb region.

scholarly journals Physiographic factors affecting the stratigraphy of peat deposits in the Lower Basin of the Biebrza River / Czynniki fizjograficzne wpływające na stratygrafię złoża torfu w Dolnym Basenie Doliny Biebrzy

2012 ◽  
Vol 17 (1) ◽  
pp. 69-76
Author(s):  
Henryk Jaros
Keyword(s):  
Ground Water ◽  
Cross Sections ◽  
Factors Affecting ◽  
North West ◽  
Underground Waters ◽  
Peat Deposits ◽  
Narrow Valley ◽  
West Part ◽  
River Confluence ◽  
The Village

Abstract Analyses of water conditions in the Lower Basin of the Biebrza River and deposit stratigraphy were conducted in cross-sections through the valley, where geodetic measurements were also made. Peat type in particular layers of the soil profile was determined in selected cross-sections at 100 m intervals. The Lower Basin of the Biebrza River is diverse with regard to the type of water supply to a peatbog, the shape of the bio-accumulative basin’s bottom and the slope of peatbog surface along and across the valley. These factors resulted in the development of different habitats in the peatbog. Northern part of the Lower Basin, between the main road in the village Osowiec and the inflows of the Kosódka and Wissa rivers to the Biebrza River, is a narrow valley supplied mainly with overflowing water of the Biebrza River. Habitats and hydrogenic deposits of this area developed in relation to the type and layout of mineral substratum and to the duration and depth of seasonal flooding. North-west part is mainly supplied by ground water from the adjacent upland. Peat layers, developed on ground waters flowing out from the upland, markedly slope toward the bed of the Biebrza River. Considerable fluctuations of the ground water level can be observed there and most frequently the sites are periodically drying. Part of the valley, from the inflows of the Kosódka and Wissa rivers down to the Biebrza and Narew River confluence, is mainly supplied with underground waters from upland.

Electron Microscopic Examination of a Transplantable Rat Mammary Carcinoma

1968 ◽  
Vol 26 ◽  
pp. 20-21
Author(s):  
S. Shirahama ◽  
G. C. Engle ◽  
R. M. Dutcher
Keyword(s):  
Electron Microscope ◽  
Osmium Tetroxide ◽  
Electron Microscopic Examination ◽  
Undifferentiated Carcinoma ◽  
Uranyl Acetate ◽  
Sprague Dawley ◽  
Electron Microscopic ◽  
North West ◽  
X Irradiation ◽  
Tissue Specimens

A transplantable carcinoma was established in North West Sprague Dawley (NWSD) rats by use of X-irradiation by Engle and Spencer. The tumor was passaged through 63 generations over a period of 32 months. The original tumor, an adenocarcinoma, changed into an undifferentiated carcinoma following the 19th transplant. The tumor grew well in NWSD rats of either sex at various ages. It was invariably fatal, causing death of the host within 15 to 35 days following transplantation.Tumor, thymus, spleen, and plasma from 7 rats receiving transplants of tumor at 3 to 9 weeks of age were examined with an electron microscope at intervals of 8, 15, 22 and 30 days after transplantation. Four normal control rats of the same age were also examined. The tissues were fixed in glutaraldehyde, postfixed in osmium tetroxide and embedded in Epon. The plasma was separated from heparanized blood and processed as previously described for the tissue specimens. Sections were stained with uranyl acetate followed by lead citrate and examined with an RCA EMU-3G electron microscope.

SEM and TEM observations of sperm development in the testis of the freshwater fish Oreochromis mossambicus

1990 ◽  
Vol 48 (3) ◽  
pp. 58-59
Author(s):  
Daryl A. Cornish ◽  
George L. Smit
Keyword(s):  
Morphological Characteristics ◽  
Oreochromis Mossambicus ◽  
Breeding Cycle ◽  
Limited Information ◽  
North West ◽  
The North ◽  
Sem And Tem ◽  
Sperm Development ◽  
Ultrastructural Characteristics ◽  
The University

Oreochromis mossambicus is currently receiving much attention as a candidater species for aquaculture programs within Southern Africa. This has stimulated interest in its breeding cycle as well as the morphological characteristics of the gonads. Limited information is available on SEM and TEM observations of the male gonads. It is known that the testis of O. mossambicus is a paired, intra-abdominal structure of the lobular type, although further details of its characteristics are not known. Current investigations have shown that spermatids reach full maturity some two months after the female becomes gravid. Throughout the year, the testes contain spermatids at various stages of development although spermiogenesis appears to be maximal during November when spawning occurs. This paper describes the morphological and ultrastructural characteristics of the testes and spermatids.Specimens of this fish were collected at Syferkuil Dam, 8 km north- west of the University of the North over a twelve month period, sacrificed and the testes excised.

The Clinical Spectrum of Anaphylaxis in North-West England

1996 ◽  
Vol 26 (12) ◽  
pp. 1364-1370 ◽  
Author(s):  
R. S. H. Pumphrey ◽  
S. J. Stanworth
Keyword(s):  
Clinical Spectrum ◽  
North West

The North West Passage

2014 ◽  
Author(s):  
Roald Amundsen ◽  
Godfred Hansen
Keyword(s):  
North West ◽  
The North
Sign in / Sign up

Export Citation Format

Share Document