منابع مشابه
Alarm pheromones of the ant atta texana.
4-Methyl-3-heptanone (0.59 pg/head) and 2-heptanone (0.1 4 pg/ head) are the main volatile components of the mandibular glands of major workers. In the laboratory, worker ants detected and were attracted by 4-methyl-3-heptanone at a concentration of 5.7 x 10-l3 g/cm3 (2.7 x lo7 molecules/cm3). They were alarmed by a concentration of 5.7 x 10-la g/cm3 (2.7 x 108 molecules/ cm3). 2-Heptanone is l...
متن کاملMicrocystin in Missouri reservoirs
Graham, J. L. and J. R. Jones 2009. Microcystin in Missouri reservoirs. Lake Reserv. Manage. 25:253–263. During summers (May–Aug) 2004–2006, 177 Missouri reservoirs were sampled monthly at open pelagic locations to assess regional patterns in microcystin concentration, frequency of occurrence over successive summer seasons and relations with environmental factors. Microcystin was detected in 58...
متن کاملSurface rodlets of Tilletia indica teliospores.
Tilletia indica teliospores were studied by use of thin sections and freeze-etch replicas. Surfaces of these spores have rodlet patterns which differ from those previously reported for spores of other fungi. The rodlets on T. indica teliospores average 240 nm in length and are not grouped into fascicles.
متن کاملMale Polymorphism and Polyethism in Perdita texana (Hymenoptera: Andrenidae)
Ann. Entomol. Soc. Am. 85(5): 616-626 (1992) ABSTRACT Males of Perdita texana (Cresson), a communal, ground nesting, univoltine bee, show striking variation in head size and shape; larger males have disproportionately large heads and disproportionately undersized thoraces. As body size increases, the components of head shape that increase most strongly allometrically are the dimensions of the s...
متن کاملInbreeding effects on sperm production in clam shrimp (Eulimnadia texana)
Hypothesis: Inbreeding depression is manifest in lower sperm production. Organism: Freshwater crustaceans (clam shrimp – Eulimnadia texana), from the southwestern United States, which have high levels of inbreeding. Methods: Comparisons of semi-thin sections of the male gonad among selfed and outcrossed siblings from four families. Results: There was a twofold reduction in sperm production in i...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annals of the Missouri Botanical Garden
سال: 1921
ISSN: 0026-6493
DOI: 10.2307/2989987