نتایج جستجو برای: tragopogon graminifolius

تعداد نتایج: 177  

2016
Josh Jenkins Shaw Alexey Solodovnikov

Lord Howe is an oceanic and relatively young island situated in an area of complex geological and therefore biogeographical processes. The island boasts a large number of endemic species, including many beetles, however, few groups are in an adequate state of systematic knowledge for biogeographic investigation. Recent advances in the systematics of the hyper-diverse rove beetle tribe Staphylin...

2015
Vincent Casseau Guido De Croon Dario Izzo Camilla Pandolfi

Tragopogon pratensis is a small herbaceous plant that uses wind as the dispersal vector for its seeds. The seeds are attached to parachutes that increase the aerodynamic drag force and increase the total distance travelled. Our hypothesis is that evolution has carefully tuned the air permeability of the seeds to operate in the most convenient fluid dynamic regime. To achieve final permeability,...

2014
JOHN E. HARPER

Dmitri Pavlov and Jakob Scholbach have pointed out that part of Proposition 6.3, and hence Proposition 4.28(a), of [2] are incorrect as stated. While all of the main results of that paper remain unchanged, this necessitates modifications to the statements and proofs of a few technical propositions.

2010
Zachary E. Kayler Lucas B. Fortini John J. Battles ZACHARY E. KAYLER LUCAS B. FORTINI JOHN J. BATTLES

For an old-growth forest edge in the Sierra Nevada, we quantified the extent of edge effects from a group selection harvest. Across transects from the interior of the old-growth forest through the group selection opening, we quantified changes in resource availability (light, soil moisture, and seedbed) and vegetation composition (cover, richness). We found a steep change in light availability ...

ژورنال: :تحقیقات مرتع و بیابان ایران 2016
حسین ارزانی جواد معتمدی (ترکان) سید رضا حسینی

آگاهی از جواب گویی علوفه مرتع به نیاز روزانه واحد دامی چراکننده در مرتع، یکی از موارد ضروری در تعادل دام و مرتع می باشد. به همین منظور در پژوهش حاضر، مطلوبیت مقادیر شاخص های کیفیت علوفه گونه های مورد چرای دام در مراتع ییلاقی سرعلی آباد گلستان به منظور تأمین نیاز روزانه واحد دامی مورد بررسی قرار گرفت. در این مطالعه از 12 گونه مرتعی شامل: achillea millifolium، agropyrontrichophorum، centureazuvan...

ژورنال: :بیماریهای گیاهی 2014
ابوذر قربانی

polymyxa betae اولین بار در سال 1964 به عنوان پارازیت ریشه چغندرقند توسط کسکین (keskin) تشخیص، نامگذاری وتشریح شد. لکن اهمیت این شبه قارچ بیشتر به خاطر نقش آن در پایداری و انتقال ویروس رگبرگ زرد نکروتیک چغندرقند (, bnyvv(beet necrotic yellow vein virus عامل بیماری ریشه­ریشی (ریزومانیا)  است. تاکنون آلودگی p. betaeدر گیاهانی نظیر atriplex patula (اسفناج صحرایی)، amaranthus retroflexus (تاج خروس ...

Journal: :Ecological applications : a publication of the Ecological Society of America 2010
Janet S Prevéy Matthew J Germino Nancy J Huntly

The invasion and spread of exotic plants following land disturbance threatens semiarid ecosystems. In sagebrush steppe, soil water is scarce and is partitioned between deep-rooted perennial shrubs and shallower-rooted native forbs and grasses. Disturbances commonly remove shrubs, leaving grass-dominated communities, and may allow for the exploitation of water resources by the many species of in...

Journal: :Molecules 2011
Zdenka Kucekova Jiri Mlcek Petr Humpolicek Otakar Rop Pavel Valasek Petr Saha

Experimental studies have shown that phenolic compounds have antiproliferative and tumour arresting effects. The aim of this original study was to investigate the content of phenolic compounds (PhC) in flowers of Allium schoenoprasum (chive), Tragopogon pratensis (meadow salsify) and Rumex acetosa (common sorrel) and their effect on proliferation of HaCaT cells. Antiproliferative effects were e...

2013
N.K.G. Salama F. van den Bosch M. J. Jeger

1 Population dynamics of the biennial plant Tragopogon pratensis have been monitored 2 in the Park Grass Experiment at Rothamsted Research, Harpenden, UK, over many 3 years. Observations of diseased T. pratensis, systemically infected by the autoecious 4 demicyclic rust Puccinia hysterium, were made over the period 1995-2008, and 5 confirmed an outbreak pattern of dynamics, characterised by an ...

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