The molecular mechanisms leading to asexuality remain little understood despite their substantial bearing on why sexual reproduction is dominant in nature. Here, we examine the role of hybridization in the origin and spread of obligate asexuality in Daphnia pulex, arguably the best-documented case of contagious asexuality. Obligately parthenogenetic (OP) clones of D. pulex have traditionally be...

Asteraceae familyası hem dünyada de ülkemizde geniş cins ve tür zenginliğine sahip bitki familyaları arasında yer almaktadır. Bu öneme binaen bu büyük önemli aileye ait beş farklı cinsten türün (Pulicaria vulgaris (L.) Gaertner, Picris strigosa Bieb., Cichorium intybus L., Lactuca viminea J. Presl & C. Chondrilla juncea L.) Feulgen boyama tekniği kullanılarak kromozom sayımı detaylı kar...

Background and objectives: Several natural compounds have been identified for the treatment of leishmaniasis. Due to a few safe drugs and the side effects caused by available chemotherapy, some new drugs for treatment of leishmaniasis are requested. The genus Pulicaria (Asteraceae) is represented in the flora of Iran by five species. Phytochemical studies on Pulicaria species have revealed some...

Understanding the drivers and consequences of disease epidemics is an important frontier in ecology. However, long-term data on hosts, their parasites, and the corresponding environmental conditions necessary to explore these interactions are often unavailable. We examined the dynamics of Daphnia pulicaria, a keystone zooplankter in lake ecosystems, to explore the long-term causes and consequen...

Pentacyclic triterpenes from leaves of Cagaita (Eugenia dysenterica)Cristian A. Gasca, Matheus Chaves, Christopher W. Fagg, Pérola de Oliveira e Magalhães, Yris M. Fonseca-Bazzo, Dâmaris Silveira

Objective: To evaluate the in vitro cytotoxicity, antioxidant activities and structure-activity relationship of secondary metabolites isolated from Pulicaria

Pulicaria species, such as Pulicaria undulata, are rich in sesquiterpene lactones. The methylene chloride/ methanol (1:1) extract of P. undulata resulted in the isolation of new sesquiterpenes (1–4), as well as previously reported metabolites (5–14). Structures were elucidated by spectroscopic analyses. Using a mouse peritoneal macrophage bioassay, lipopolysaccharide-induced nitric oxide inhibi...

Kutaja bija, Kudasappalai or Inderjou is an important seed drug in Ayurveda, Siddha and Unani Medicines. The market sample of Madras Crude drug trade has been identified in our laboratory as the seeds of Holarrhena - anti - dysenterica wall of the family Apocynaceae. The morphology, anatomy, fluorescence analysis and chemical studies of the drugs are reported.

BACKGROUND Multiple transitions to obligate parthenogenesis have occurred in the Daphnia pulex complex in North America. These newly formed asexual lineages are differentially distributed being found predominantly at high latitudes. This conforms to the rule of geographical parthenogenesis postulating prevalence of asexuals at high latitudes and altitudes. While the reproductive mode of high-la...

The “cagaita tree” (Eugenia dysenterica) is a plant found widespread in the Brazilian Cerrado. Its fruit is used for popular consumption and for industrial purposes. This study opens a new perspective for the generation of population genetic data and parameters estimates for devising sound collection and conservation procedures for Eugenia dysenterica. A battery of 356 primer pairs developed fo...