biological monitoring using benthic organisms is one of the best and the most inexpensive methods for anthropogenic activities evaluation in aquatic ecosystems. the purpose of present investigation was biological monitoring of shahrud river that was performed in the qazvin province using by macro benthic invertebrates population. in the present investigation macro benthic invertebrate samples w...

<p style='text-indent:20px;'>A classical approach to constructing combinatorial designs is the group action of a <inline-formula><tex-math id="M2">\begin{document}$ t $\end{document}</tex-math></inline-formula>-transitive or id="M3">\begin{document}$ $\end{document}</tex-math></inline-formula>-homogeneous permutation on base block, which yields id="M...

The need for comparative studies of iridoviruses to elucidate the relationships between them has been well appreciated. Sixteen iridoviruses, including type species from each of the four recognized genera of the Iridoviridae, were compared by restriction endonuclease characterization, hybridization to the major structural protein (MSP) gene of an invertebrate iridescent virus (IV) isolate at va...

Drainage ditches, either seasonally flooded or permanent, are commonly found on intensively managed lowland farmland in the UK. They are potentially important for wetland biodiversity but, despite their ubiquity, information on their biodiversity and management in the wider countryside is scarce. We surveyed 175 ditches for their physical and chemical characteristics, spatial connectivity, plan...

1. Research in agricultural ecosystems is uncovering how the management of crop fields leads to the delivery of transgenic crop residues to adjacent waterways. Aquatic consumers encountering this material may be reduced in abundance and ⁄or limit their feeding activity, subsequently altering organic matter breakdown rate, which is a key ecosystem process in streams. 2. We investigated the effec...

Includes 3 species, namely Plumbago indica P. Plumbago indica Plumbaginaceae is a perennial herb, commonly cultivated. Research project indicated that P. indica roots are indeed rich in. Nisha Sharma and Purshotam Kaushik. The present review deals with chemical compounds, medicinal.The aerial part of Plumbago indica L. family: Plumbaginaceae was studied to fix. Screening process of Plumbago ind...

Lord Howe Island is an eroded remnant of a shield volcano approximately 600 km northeast of Sydney, New South Wales, Australia. It has fascinated biologists for more than a century because of its unique and iconic fauna and flora, and was declared a World Heritage Site in 1982. Although the terrestrial invertebrate fauna is reasonably well known for many groups, most Hymenoptera, apart from ant...

the healthy condition of the taleghan river in upstream of the taleghan dam was studied in order to better understanding the role of benthic invertebrate bio-purification faced to waste water inflows to the river in several parts. sampling was started from the fall of 2005 and continued to the winter of 2006. in this way, five stations were selected using a pre-sampling strategy based on simila...

Where did vertebrate genes come from? Here we address this question by analyzing eight completely sequenced land vertebrate genomes and six completely sequenced invertebrate genomes. Approximately 70% of the vertebrate genes can be found in the six invertebrate genomes with the standard homology search criteria (denoted as V.MCL), another approximately 6% can be found with relaxed search criter...