scorpion venoms contain of variety of peptides toxic to mammals ، insects and crustaceans. toxic peptides are the main factors in scorpion venom causing toxicity, (their amount being 1-3%of total venom.). most of the scorpion toxins have been isolated from the venoms of scorpions in the family buthidae. the scorpion buthotus schach belonging to the buthidae family is widely found in the western...

In this paper, we construct metallic Kähler and nearly structures on Riemannian manifolds. For such manifolds with these structures, study curvature properties. Also, describe linear connections the manifold which preserve associated fundamental [Formula: see text]-form satisfy some additional conditions present results concerning them.

Composites with a bulk metallic glass matrix were synthesized and characterized. This was made possible by the recent development of bulk metallic glasses that exhibit high resistance to crystallization in the undercooled liquid state. In this letter, experimental methods for processing metallic glass composites are introduced. Three different bulk metallic glass forming alloys were used as the...

OBJECTIVE Artifacts caused by metallic objects, such as dental crowns, dental implants and metallic orthodontic appliances, are a common problem in head and neck MRI. The aim of this retrospective study was to identify the main metal dental objects that produce artifacts on brain MRIs. STUDY DESIGN Imaged metallic artifacts and their sources were identified. Artifact image plane was rated on ...

Homogeneous plasticity in metallic glasses is generally only observed at high temperatures or in very small structures (less than ≈ 100 nm), so their applications for structural performance have been very limited. Here, nanolaminates with alternating layers of Cu 50 Zr 50 metallic glass and nanocrystalline Cu are synthesized and it is found that samples with an optimal composition of 112-nm-thi...

INTRODUCTION Aspiration or ingestion of foreign bodies may occur during dental procedures. Diagnosis and management of these accidents is sometimes challenging. The authors present a small series of clinical cases. CASE 1 Adolescent observed due to suspected accidental bracket ingestion, not visible on x-ray, removed by upper digestive endoscopy. CASE 2 Adolescent observed after accidental ...

A new method to rapidly generate pyrrolidines via a SOMO-activated enantioselective (3 + 2) coupling of aldehydes and conjugated olefins has been accomplished. A radical-polar crossover mechanism is proposed wherein olefin addition to a transient enamine radical cation and oxidation of the resulting radical furnish a cationic intermediate which is vulnerable to nucleophilic addition of a tether...

At the nexus of changing marital and fertility behavior is a new reality of contemporary family life—the fact that a significant fraction of adults today (will) have biological children by more than one partner, sometimes called ‘multi-partnered fertility.’ In this paper, we use data from the Fragile Families and Child Wellbeing Study to explore the consequences of multipartnered fertility for ...

For suitable illumination and observation conditions, sparkles may be observed in metallic coatings. The visibility of these sparkles depends critically on their intensity, and on the paint medium surrounding the metallic flakes. Based on previous perception studies from other disciplines, we derive equations for the threshold for sparkles to be visible. The resulting equations show how the vis...

Background. Much of the sedimentary transport and depositional history of Mars may be recorded in the morphologic characteristics of the individual rocks or particles that make up its sedimentary clast population (defined as a rock fragment or grain resulting from the breakdown of larger rocks or bedrock). Measuring morphology is crucial; it retains the best record of sorting and abrasive effec...