A spear is a pole weapon consisting of a shaft, usually of wood, with a pointed head.The head may be simply the sharpened end of the shaft itself, as is the case with fire hardened spears, or it may be made of a more durable material fastened to the shaft, such as bone, flint, obsidian, iron, steel or bronze (or other type of stone or metal).
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Spear grass (Heteropogon contortus (L.) Beauv. ex Roem.& Schult.) is a tropical perennial grass. It grows to a height of 50 to 150 cm, is tufted and highly variable. Its stems are geniculated at the base, erect at their upper levels, often branched, particularly at flowering (Cook et al., 2005).
Roles of Plant-Specific Inserts in Plant Defense - ScienceDirect
Jul 01, 2020 · To date, the PSIs of only a few plant species have been characterized structurally. Crystallization of barley prophytepsin (Figure 2A) confirmed speculation that the native PSI structure resembled other closed-form monomeric SAPLIPs, such as NK-lysin, in terms of length and positioning of helical domains, position of disulfide bonds, and an overall helix-kink-helix structure [24,25].
RO Spare Part Manufacturers, Ro Spares Suppliers & Exporters
RO spare parts are cost effective and increase the life of the water purifier or plant. Spare parts include filters, disks, tubes, adjusters, mounts and more. RO spare parts are important as it is not feasible to replace the whole purifier if it has a minor issue, the defective part can be replaced to make the purifier/plant work perfectly fine.
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R/C Helicopters Whether you're looking to fly indoors or outdoors, experienced or beginner, you'll find the right heli for the right price at RC Planet. You don't need to be an experienced radio control helicopter pilot to enjoy the thrills that a high quality R/C heli provides.
Common insecticide disrupts aquatic ... - Science Advances
View ORCID Profile Peter C. Van Metre 3, View ORCID Profile Barbara J. Mahler 3, View ORCID Profile Mark W. Sandstrom 4, View ORCID Profile Lisa H. Nowell 5, View ORCID Profile Daren M. Carlisle 6 and ; View ORCID Profile Patrick W. Moran 7; 1 Colorado Natural Heritage Program, Colorado State University, Fort Collins, CO 80523, USA.
The following is a defined list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets).
water lettuce (Pistia stratiotes) - Species Profile
Identification: Stem/Roots: Pistia stratiotes is a free-floating, herbaceous monocot with a rosette of gray-green leaves, resembling a head of lettuce (thus the common name), occurring as a single plant or connected to others by stolons (Dressler et al. 1987; Langeland and Burks 1998).
Pulmonaria 'High Contrast' (Lungwort) is a compact, clump-forming, semi-evergreen perennial with profuse clusters of large, outfacing, pink flowers maturing to blue in spring. Equally beautiful is the brilliant foliage of wavy, spear-shaped, dark green leaves, adorned with melting silver, which remains attractive throughout the entire growing season if cut back after blooming. Resistant to ...
More about Carbon Dating. In the 1940's Dr. Willard F. Libby invented carbon dating for which he received the Nobel Prize in chemistry in 1960. Carbon dating has given archeologists a more accurate method by which they can determine the age of ancient artifacts. The halflife of carbon 14 is 5730 ± 30 years, and the method of dating lies in trying to determine how much carbon 14 (the ...