On the chemical composition of the Metearites Amana (= Hamestead) and Eagle Station

1918 ◽  
Vol 18 (85) ◽  
pp. 173-179 ◽  
Author(s):  
G. T. Prior
Keyword(s):  
Chemical Composition ◽  
North America ◽  
Iowa County

The Amana meteorite, known also as Iowa County, Homestead, and West Liberty, is fully described in O. C. Farrington's 'Catalogue of the Meteorites of North America'. After the appearance of a brilliant meteor which on the night of February 12, 1875, passed with loud detonations from S.W. to N.E. over northern Missouri and southern Iowa, about 100 meteoric stones, weighing altogether some 500 lb., were found scattered over an elliptic area of about eighteen square miles from Amana in Amahs township to Boltonville in Iowa township, both in Iowa Co., Iowa.

Arthropod diversity in necrotic tissue of three species of columnar cacti (Cactaceae)

2001 ◽  
Vol 133 (3) ◽  
pp. 301-309 ◽  
Author(s):  
Sergio Castrezana ◽  
Therese Ann Markow
Keyword(s):  
Chemical Composition ◽  
North America ◽  
Sonoran Desert ◽  
Abiotic Factors ◽  
Necrotic Tissue ◽  
Columnar Cacti ◽  
Stenocereus Thurberi ◽  
Pachycereus Pringlei ◽  
Organ Pipe ◽  
Host Characteristics

AbstractWe compared the insect and arachnid species found in spring and summer samples of necrotic tissue of three species of columnar cacti, cardón [Pachycereus pringlei (S. Watson) Britten and Rose], organ-pipe (Stenocereus thurberi Buxb.), and senita [Lophocereus schottii (Engelm.) Britten and Rose] (all Cactaceae), endemic to the Sonoran Desert of North America. A total of 9380 arthropods belonging to 34 species, 23 families, 10 orders, and 2 classes were collected in 36 samples. Arthropod communities differed in composition among host cacti, as well as between seasons. These differences may be a function of variation in host characteristics, such as chemical composition and abiotic factors, such as water content or temperature.

scholarly journals Source identification and airborne chemical characterisation of aerosol pollution from long-range transport over Greenland during POLARCAT summer campaign 2008

2011 ◽  
Vol 11 (19) ◽  
pp. 10097-10123 ◽  
Author(s):  
J. Schmale ◽  
J. Schneider ◽  
G. Ancellet ◽  
B. Quennehen ◽  
A. Stohl ◽  
...  
Keyword(s):  
Chemical Composition ◽  
North America ◽  
North American ◽  
Dispersion Model ◽  
Mean Value ◽  
Particle Dispersion ◽  
Gas Analysis ◽  
Geometric Standard Deviation ◽  
Transport Pathways ◽  
Aitken Mode

Abstract. We deployed an aerosol mass spectrometer during the POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements and Models, of Climate, Chemistry, Aerosols, and Transport) summer campaign in Greenland in June/July 2008 on the research aircraft ATR-42. Online size resolved chemical composition data of submicron aerosol were collected up to 7.6 km altitude in the region 60 to 71° N and 40 to 60° W. Biomass burning (BB) and fossil fuel combustion (FF) plumes originating from North America, Asia, Siberia and Europe were sampled. Transport pathways of detected plumes included advection below 700 hPa, air mass uplifting in warm conveyor belts, and high altitude transport in the upper troposphere. By means of the Lagrangian particle dispersion model FLEXPART, trace gas analysis of O3 and CO, particle size distributions and aerosol chemical composition 48 pollution events were identified and classified into five chemically distinct categories. Aerosol from North American BB consisted of 22% particulate sulphate, while with increasing anthropogenic and Asian influence aerosol in Asian FF dominated plumes was composed of up to 37% sulphate category mean value. Overall, it was found that the organic matter fraction was larger (85%) in pollution plumes than for background conditions (71%). Despite different source regions and emission types the particle oxygen to carbon ratio of all plume classes was around 1 indicating low-volatility highly oxygenated aerosol. The volume size distribution of out-of-plume aerosol showed markedly smaller modes than all other distributions with two Aitken mode diameters of 24 and 43 nm and a geometric standard deviation σg of 1.12 and 1.22, respectively, while another very broad mode was found at 490 nm (σg = 2.35). Nearly pure BB particles from North America exhibited an Aitken mode at 66 nm (σg = 1.46) and an accumulation mode diameter of 392 nm (σg = 1.76). An aerosol lifetime, including all processes from emission to detection, in the range between 7 and 11 days was derived for North American emissions.

Building an Effective Pipe Procurement and Manufacturing Process

2012 ◽  
Author(s):  
Alexander J. Afaganis ◽  
Larry Christmas
Keyword(s):  
Quality Assurance ◽  
Chemical Composition ◽  
North America ◽  
Process Control ◽  
Manufacturing Process ◽  
Project Costs ◽  
Key Features ◽  
Pipe Manufacturing ◽  
Transmission Pipelines

Over the last 5 years there have been a large number of transmission pipelines installed with much of the pipe procured and manufactured outside of North America — many from non-integrated pipe manufacturers. Over this same period there have been a significant number of pre-operation field hydrostatic testing pipe failures as a consequence of low and variable pipe strength, and chemical composition variations. A strong, structured and effective pipe procurement and manufacturing process following the proven “plan–do–check–act” quality assurance model can minimize such issues. Further, such a process can properly manage the inevitable process and product deviations ultimately minimizing project timeline disruptions and reducing project costs. A practical outline of the key features of such a system are discussed from the specification and bid package development through vendor qualification, bid contract review, slab, plate and pipe manufacturing (and the process control documentation and verification), manufacturing surveillance, and follow-up activities.

scholarly journals Chemistry, biological activities and toxic effects of alkaloidal constituents of genus Delphinium - A mini review

2021 ◽  
Vol 10 (4) ◽  
pp. 486-499
Author(s):  
Mohammadreza Lotfaliani ◽  
Seyed Abdulmajid Ayatollahi ◽  
Farzad Kobarfard ◽  
Mustafa ghanadian ◽  
Pardis Mohammadi Pour
Keyword(s):  
Chemical Composition ◽  
North America ◽  
Biological Activities ◽  
Toxic Effects ◽  
Cytotoxic Activities ◽  
Diterpenoid Alkaloids ◽  
Medicinal Uses ◽  
Therapeutic Benefits ◽  
The Family ◽  
Alkaloidal Constituents

The genus Delphinium is one of the essential members of the family Ranunculaceae. These species grow wild in North America, Europe, and Asia. They have demonstrated antioxidant, antimicrobial, and cytotoxic activities. Diterpenoid alkaloids are their main constituents and seem to be responsible for medicinal and toxic properties. The primary purpose of this paper is to review the therapeutic benefits of Delphinium species, chemical composition, and its medicinal uses, in addition to the reported toxic effects of these plants influencing different animals and humans.

scholarly journals Source identification and airborne chemical characterisation of aerosol pollution from long-range transport over Greenland during POLARCAT summer campaign 2008

2011 ◽  
Vol 11 (3) ◽  
pp. 7593-7658 ◽  
Author(s):  
J. Schmale ◽  
J. Schneider ◽  
G. Ancellet ◽  
B. Quennehen ◽  
A. Stohl ◽  
...  
Keyword(s):  
Chemical Composition ◽  
North America ◽  
North American ◽  
Dispersion Model ◽  
Mean Value ◽  
Particle Dispersion ◽  
Gas Analysis ◽  
Size Distributions ◽  
Transport Pathways ◽  
June July

Abstract. We deployed an aerosol mass spectrometer during the POLARCAT (Polar Study using Aircraft, Remote Sensing, Surface Measurements and Models, of Climate, Chemistry, Aerosols, and Transport) summer campaign in Greenland in June/July 2008 on the research aircraft ATR-42. Online size resolved chemical composition data of submicron aerosol were collected up to 7.6 km altitude in the region 60 to 71° N and 40 to 60° W. Biomass burning (BB) and fossil fuel combustion (FF) plumes originating from North America, Asia, Siberia and Europe were sampled. Transport pathways of detected plumes included advection below 700 hPa, air mass uplifting in warm conveyor belts, and high altitude transport in the upper troposphere. By means of the Lagrangian particle dispersion model FLEXPART, trace gas analysis of O3 and CO, particle size distributions and aerosol chemical composition 48 pollution events were identified and classified into five chemically distinct categories. Aerosol from North American BB consisted of 22% particulate sulphate, while with increasing anthropogenic and Asian influence aerosol was composed of up to 37% sulphate category mean value. Overall, it was found that the organic matter fraction was larger (85%) in pollution plumes than for background conditions (71%). Despite different source regions and emission types the particle oxygen to carbon ratio of all plume classes was around 1 indicating low-volatile highly oxygenated aerosol. Also the volume size distributions were rather similar for all sampled plume categories. This can be explained by the relatively long transport times of roughly one week from North America and two weeks from Asia/Siberia. The derived aerosol lifetime for North American emissions was about 9 ± 2 days.

scholarly journals Far from boring: a new Grenvillian perspective on Mesoproterozoic tectonics

2021 ◽  
Author(s):  
Félix Gervais ◽  
Alexandre Beaudry ◽  
Charles Kavanagh-Lepage ◽  
Abdelali Moukhsil
Keyword(s):  
Chemical Composition ◽  
North America ◽  
Plate Tectonics ◽  
Geochemical Data ◽  
Eastern North America ◽  
Average Chemical Composition ◽  
Volcanic Arcs ◽  
The Core ◽  
Mountain Belt ◽  
Grenvillian Orogeny

Abstract As determining when plate tectonics began on Earth is a highly debated subject, it is crucial to understand the “boring billion” (1.8 to 0.8 billion years ago), a period of tectonic quiescence inferred from proxies, such as the average chemical composition of the mineral zircon on Earth and the isotopic composition of seawater derived from marine rocks. Yet this period saw the construction of what may have been the biggest mountain belt that ever existed, the remnants of which are found in the Grenville Orogen of eastern North-America. This contribution first exposes a compilation of multidisciplinary geological datasets and new geochemical data from igneous suites emplaced during the Grenvillian Orogeny that are incompatible with the current tectonic paradigm. We then present a completely revised model for Grenvillian tectonics. In contrast with the actual Laurentian-centred paradigm, our model involves the construction of a newly revealed continent by amalgamation of volcanic arcs far away from Laurentia (the craton forming the core of actual North-America) and their collision 60 millions year later than the currently accepted timing. This new model resolves the longstanding contradiction between tectonic proxies and geological record and invalidates the view considering the Mesoproterozoic as a tectonically quiet Era.

scholarly journals МОРФОЛОГИЧЕСКАЯ ИЗМЕНЧИВОСТЬ ГЕМОЦИТОВ HARPALUS RUFIPES (COLEOPTERA, CARABIDAE) ПРИ ПИТАНИИ КОРМАМИ РАСТИТЕЛЬНОГО И ЖИВОТНОГО ПРОИСХОЖДЕНИЯ

2015 ◽  
Vol 5 (01) ◽  
pp. 133
Author(s):  
D. Ye. Reshetnyak
Keyword(s):  
Chemical Composition ◽  
Food Intake ◽  
North America ◽  
Key Words ◽  
Morphological Variability ◽  
Small Diameter ◽  
Physiological Adaptation ◽  
Food Items ◽  
Linear Dimensions ◽  
Animal Feeding

<p>The study of morphological variability <em>Harpalus rufipes</em> (De Geer) hemocytes was carried out. <em>Harpalus</em> <em>rufipes</em> (De Geer) is a field polyzonal species found almost throughout the temperate zone of Eurasia and North America. Structure of the population of hemocytes was studied. We identified seven types of cells: adipohemocytes, granulocytes, plasmatocytes, prohaemocytes, shperulocytes, cystocytes, and oenocytes. The effect of different plant and animal diets on linear dimensions of hemocytes and their nuclei was studied. In all samples the shperulocytes and oenocytes had the largest size; theirs large and small diameter were 18.14 ± 6.51 and 15.85 ± 5.03 µm, 17.08 ± 2.93 and 14.43 ± 2.16 µm respectively. Prohaemocytes were the smallest: 10.95 ± 2.11 and 9.59 ± 1.85 µm. Linear dimensions N<sub>1</sub> and N<sub>2</sub> of oenocytes, cystocytes and shperulocytes were 8.83 ± 3.13 and 6.81 ± 1.64, 8.70 ± 2.42 and 6.34 ± 1.99, 8.41 ± 3.15 and 6.71 ± 2.25 µm respectively. Among four sunflower feeding the largest size were registered for adipohemocytes, prohaemocytes, shperulocytes and oenocytes. Maximum sizes of granulocytes, plasmatocytes and cystocytes were fixed during millet and wheat feeding. The chemical composition of food intake had different effects on certain types of hemocytes, leading to increase or decrease in their size. Among six animal feeding we registered the largest size for adipohemocytes, plasmatocytes, cystocytes, and oenocytes towards Sarcophagidae sp. larvae. In all samples the largest size had shperulocytes and oenocytes. The hemocytes of imago changed their sizes insignificantly regards plant or animal food, which testifies a physiological adaptation of beetle feeding towards food items.</p> <p><em>Key words: morphological variability, hemocytes, Harplus rufipes, feeding.</em></p><p> </p><p><a href="http://dx.doi.org/10.7905/bbmspu.v5i1.969"><strong>http</strong><strong>://</strong><strong>dx</strong><strong>.</strong><strong>doi</strong><strong>.</strong><strong>org</strong><strong>/10.7905/</strong><strong>bbmspu</strong><strong>.</strong><strong>v</strong><strong>5</strong><strong>i</strong><strong>1.969</strong></a><strong> </strong></p><p><em><br /></em></p>

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