نتایج جستجو برای: rh cathartica

تعداد نتایج: 15510  

در پژوهش حاضر، دوگونۀ Rhamnus pallasiiو catharticaRhamnus از تیرۀ  Rhamnaceaeدر شمال ایران ازنظر ریزریخت‌شناسی سطح دانه و گرده‌شناسی بررسی شدند. ویژگی‌هایی ازجمله محور قطبی (P)، محور استوایی (E) و نسبت طول محور قطبی به طول محور استوایی (P/E) گرده با میکروسکوپ نوری، شکل کلی دانۀ گرده در نمای قطبی و استوایی، تزئینات سطح اگزین و سطح اندوکارپ (درون‌بر میوه) دانه با عکس‌برداری میکروسکوپ الکترونی (SE...

چکیده در پژوهش حاضر، مطالعه‌های ریخت‌شناسی آرایه‌های فروگونه‌ای دو گونۀ Rhamnus cathartica و Rhamnus pallasii، در شمال و شمال‌شرق ایران انجام شدند. به‌منظور درک درست روابط بین‌گونه‌ای و تعیین ارزش تاکسونومیکی صفت‌ها با ثبت اطلاعات ریخت‌شناسی، 58 صفت شامل 26 صفت کمّی و 32 صفت کیفی اندازه‌گیری شدند؛ سپس با استفاده از روش تاکسونومی عددی از تحل...

2013
Jonathan Frye Wolfgang Grosse

Tree seedling flooding tolerance for 22 species was assessed under controlled field condi­ tions. Initial heights under control (freely draining soil, n = 20 per species) and flooded (stand­ ing water, depth = 10 cm, n = 20 per species) conditions were measured in March 1990. Sur­ vival, height and diameter growth were determined after 120 days. Recovery from flooding effects was assessed in th...

2017
J. Ryan Stewart William R. Graves

Rhamnus cathartica is an invasive shrub capable of high fecundity in North America. The physiology of R. cathartica has received little attention, but more is needed to understand traits that enhance its success in disturbed environments. Such data may help to predict invasiveness of closely related species such as Frangula caroliniana. We hypothesized that R. catharticawould have greater relat...

2005
Kathleen S. Knight Peter B. Reich

Using a nested plot design in oak forests in Minnesota, USA we measured the percent cover of young individuals of an exotic invading shrub, Rhamnus cathartica (common buckthorn), to assess the relationships at two scales between invasibility, propagule and light availability, and richness and cover of native species. Comparing patches (1 m) within 17 Quercus -dominated stands (each 1 ha, within...

2013
Asuka Yamashiro Tadashi Yamashiro Yoichi Tateishi

UNLABELLED PREMISE OF THE STUDY Microsatellite markers were developed for the sea-dispersed legume Canavalia cathartica to investigate its genetic diversity and population structure. We also applied these microsatellite markers to the closely related species C. lineata. • METHODS AND RESULTS Ten primer sets were developed for C. cathartica, and all of the primers were amplified in C. linea...

2013
D. SUKUMAR

In this present work the fresh flowers of Allamanda Cathartica Linn. were collected and the solution of Allamanda Cathartica was extracted with 90% methanol under reflux. The alcoholic extract was concentrated in vacuo and the aqueous concentrate, successively fractionated with benzene, peroxide free diethylether and ethylacetate. The benzene fraction was not yielding any isolable material. The...

Journal: :Environmental entomology 2007
J A Welsman C A Bahlai M K Sears A W Schaafsma

Soybean aphid, Aphis glycines Matsumura (Homoptera: Aphididae), is a severe pest of soybeans in North America. Soybean aphid populations cycle between a secondary summer host, where populations reproduce parthenogenetically and a primary host, where populations overwinter as eggs. In North America, the secondary host is soybean, and the primary hosts are Rhamnus cathartica L. (Rhamnaceae) and R...

Background and purpose: Acne is a chronic inflammatory disease of the pilosebaceous glands caused by opportunistic microorganisms. The Rhamnus cathartica is known to have biological and antioxidant properties. This research aimed at investigating the in vitro effect of gel containing 5% R. cathartica extract on acne vulgaris. Materials and methods: The gel formulation contained 25g of dried R...

2013
Md. Al Nayem Chowdhury Md. Nazmul Hossain Md. Mahbubur Rahman Md. Ashrafuzzaman

Staphylococcus aureus is one of the major pathogen responsible for skin infection, urinary tract infection (UTI) and endocarditis in human. The study was performed to determine the prevalence of multidrug resistant S. aureus in human clinical sample and to evaluate their sensitivity to Allamanda cathartica L. leaf extract. A total of 12 isolates were identified belongs to S. aureus by performin...

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