Báo cáo khoa học: "Vulnerability to freeze stress of seedlings of Quercus ilex " docx

... nine seedlings out of 50 survived). In comparison with unstressed seedlings, Kr and Ks of freeze- stressed seedlings were reduced by 90 %. Root anatomy of freeze- stressed seedlings ... freeze- stressed seedlings Three increasing levels of damage to root cortex parenchyma were identified: Original article Vulnerability to freeze stress of...

Ngày tải lên: 08/08/2014, 23:22

... sites displayed thestrategytypicalofdrought-tolerantspe- cies. The impactonallprovenances of oneweek of low-intensity water stress( –0.4 MPa) was slight. Asthe stress increased, the response varied ... values of Ψ and stress- in- duced values (except at very high levels of stress) ; whereas in Pinus taeda and Pinus strobus the absolute values of Ψ doubled even at low or medium...

Ngày tải lên: 08/08/2014, 14:20

... conductivity due to water stress in intact juveniles of Quercus rubra and Populus deltoides. Tree Physiol (in press) Zimmermann MH (1983) Xylem Structure and the Ascent of Sap. Springer ... exhibits very different responses to water stress. Since 1976, a number of ecological studies have been undertaken to determine the mechanisms of thi...

Ngày tải lên: 08/08/2014, 23:22

... prob- abilistic tool for modeling sequences of obser- vations (Rabiner and Juang, 1986). They have proven to be capable of assigning semantic la- bels to tokens over a wide variety of input types. 1 The ... parts of the model to be merged together. A merged model takes advantage of the recurring patterns within the hierarchy, and the clusters that exist in some sequences of...

Ngày tải lên: 08/03/2014, 02:21

... closing. [5]. This ‘tug- of- war’ scenario, whereby the closing of one active site exerts pressure through a suite of atomic interactions to inhibit the binding and closing of any other active sites ... formation of this TSAC somehow stabilizes the open state of the adjoining active site or precludes binding of all components to form a TSAC. Comparison of the two monomers w...

Ngày tải lên: 16/03/2014, 06:20

... pro- tomers of a contact dimer they could reflect domain- swap dimer interactions. In addition to the restoration of ligand-binding, studies that have used pairs of nonfunctional mutants to restore ... matter of course, to alter the details of ligand pharmacology. This is yet to be explored in significant detail but it is certainly true that, for example, coexpression of pai...

Ngày tải lên: 16/03/2014, 22:20

... into thematically coherent units. This method relies on a network of lexical collocations to compute the thematic coherence of the different parts of a text from the lexical cohesiveness of ... of the current topic at one position of the win- dow and this representation at a further one, it will be possible to determine how themati- cally far two parts of a text are. T...

Ngày tải lên: 31/03/2014, 04:20

... available. Total seedling height was recorded in March of each year, and the number of leaves was recorded in the last three years, from 1995 to 1997. To measure light availability to seedlings, ... oak (Quercus ilex L.) is one of the most repre- sentative forest tree species in the western part of the Mediterranean Basin [25, 26]. It is one of the clear exam - ples of t...

Ngày tải lên: 08/08/2014, 14:21

... is composed of an octamer of core histones (two each of H2A, H2B, H3 and H4), a linker histone and  166 bp ( 56 nm) of DNA [6]. The histone octamer alone associates with 146 bp of DNA ( 50 ... released lengths to a single nucleosomal DNA unwrapping, however, appeared not to be straightforward. Upon eviction of the histone octamer and histone H1 (i.e. the disruption of the...

Ngày tải lên: 14/02/2014, 18:20

... the duration of exposure as a function of the desired dose. Tests on isolated human primary cutaneous cells Detection of apoptosis Apoptosis induction is often associated with cell stress. This type of ... Epidermal recon- structs: a new tool to study topical and systemic photo- protective molecules. J Photochem Photobiol B68, 79– 87. 22 Keshvari J & Lang S (2005) Comparison o...

Ngày tải lên: 07/03/2014, 11:20