Life Cycle, Growth, Survival, and Production of Macronychus glabratus (Coleoptera: Elmidae) in Northwest Arkansas and Southeast Texas Streams

1997 ◽  
Vol 116 (2) ◽  
pp. 134 ◽  
Author(s):  
Edward C. Phillips
Keyword(s):  
Life Cycle ◽  
Cycle Growth ◽  
Northwest Arkansas ◽  
Southeast Texas

TAX-DEDUCTIBLE SAVING IN A LIFE CYCLE GROWTH MODEL

1992 ◽  
Vol 31 (59) ◽  
pp. 399-413
Author(s):  
ROBERT A. ANDROKOVICH ◽  
MICHAEL J. DALY ◽  
FADLE M. NAQIB
Keyword(s):  
Life Cycle ◽  
Growth Model ◽  
Cycle Growth

Field and laboratory studies on the life-cycle, growth and feeding preference in the hairy snail Trochulus hispidus (L., 1758) (Gastropoda: Pulmonata: Hygromiidae)

Biologia ◽  
2013 ◽  
Vol 68 (1) ◽  
Author(s):  
Małgorzata Proćków ◽  
Magda Drvotová ◽  
Lucie Juřičková ◽  
Elżbieta Kuźnik-Kowalska
Keyword(s):  
Life Cycle ◽  
Food Preferences ◽  
Land Snail ◽  
Feeding Preference ◽  
Early Spring ◽  
Reproductive Period ◽  
Acer Pseudoplatanus ◽  
Annual Life Cycle ◽  
Cycle Growth ◽  
In The Wild

AbstractFor the first time the life cycle of the common land snail Trochulus hispidus was completely described in Central Europe (Poland). This is a semelparous species predominantly with an annual life cycle and the reproductive period lasting from April till October. The first young snails hatch in spring, grow rapidly in summer and reach ca. 4 whorls until winter. In spring of the next year they mature and reproduce. After that they die. There is hardly any growth from late autumn till early spring. The average proportional growth rate is ca. 0.3 whorl/month in the wild. The fastest growth is present in the youngest snails and then gradually decreases over the course of their age. Laboratory and field observations allowed for establishing the following life cycle parameters: eggs calcified, almost spherical, ca. 1.5 mm, laid in spring and summer in batches of between 1 and 47. Time to hatching is 6–24 days, hatching is asynchronous; newly-hatched snails have approximately 1.5 whorls. Analysis of food preferences revealed, that T. hispidus tends to restrict its diet during the life. Generally the youngest snails equally consumed leaves of all four tree species offered (Fraxinus excelsior, Acer pseudoplatanus, Tilia cordata and A. platanoides) whereas adults preferred F. excelsior over A. pseudoplatanus and A. platanoides.

scholarly journals Cytokinin Detection during the Dictyostelium discoideum Life Cycle: Profiles Are Dynamic and Affect Cell Growth and Spore Germination

Biomolecules ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 702 ◽  
Author(s):  
Megan Aoki ◽  
Anna Kisiala ◽  
Shaojun Li ◽  
Naomi Stock ◽  
Craig Brunetti ◽  
...  
Keyword(s):  
Life Cycle ◽  
Dictyostelium Discoideum ◽  
Spore Germination ◽  
High Performance ◽  
Developmental Stages ◽  
Metabolomics Data ◽  
Life Cycle Stages ◽  
Cycle Growth ◽  
And Function ◽  
Exogenous Treatment

Cytokinins (CKs) are a family of evolutionarily conserved growth regulating hormones. While CKs are well-characterized in plant systems, these N6-substituted adenine derivatives are found in a variety of organisms beyond plants, including bacteria, fungi, mammals, and the social amoeba, Dictyostelium discoideum. Within Dictyostelium, CKs have only been studied in the late developmental stages of the life cycle, where they promote spore encapsulation and dormancy. In this study, we used ultra high-performance liquid chromatography-positive electrospray ionization-high resolution tandem mass spectrometry (UHPLC-(ESI+)-HRMS/MS) to profile CKs during the Dictyostelium life cycle: growth, aggregation, mound, slug, fruiting body, and germination. Comprehensive profiling revealed that Dictyostelium produces 6 CK forms (cis-Zeatin (cZ), discadenine (DA), N6-isopentenyladenine (iP), N6-isopentenyladenine-9-riboside (iPR), N6-isopentenyladenine-9-riboside-5′ phosphate (iPRP), and 2-methylthio-N6-isopentenyladenine (2MeSiP)) in varying abundance across the sampled life cycle stages, thus laying the foundation for the CK biosynthesis pathway to be defined in this organism. Interestingly, iP-type CKs were the most dominant CK analytes detected during growth and aggregation. Exogenous treatment of AX3 cells with various CK types revealed that iP was the only CK to promote the proliferation of cells in culture. In support of previous studies, metabolomics data revealed that DA is one of the most significantly upregulated small molecules during Dictyostelium development, and our data indicates that total CK levels are highest during germination. While much remains to be explored in Dictyostelium, this research offers new insight into the nature of CK biosynthesis, secretion, and function during Dictyostelium growth, development, and spore germination.

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