the benefits of a hierarchical structure
The Design and Implementation of a Log-Structured File System
Ngày tải lên :
12/09/2012, 15:05
... view the log as the most up to date ‘‘truth’’ about
the state of the data on disk. The main difference is that
database systems do not use the log as the final repository
for data: a separate data ... area is reserved for this purpose.
The separate data area of these database systems means
that they do not need the segment cleaning mechanisms of
the Sprite LFS to reclaim log space. The space ... home of the data. Rather than
redoing the operation to the separate data copy, Sprite LFS
recovery insures that the indexes point at the newest copy
of the data in the log.
Collecting data in the...
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Tài liệu Báo cáo khoa học: Crystal structure of Klebsiella sp. ASR1 phytase suggests substrate binding to a preformed active site that meets the requirements of a plant rhizosphere enzyme doc
Ngày tải lên :
16/02/2014, 09:20
... a ⁄ b domain than in the a domain [20].
This is also reflected in the rigidity of the protein. The
atomic displacement factors of the PhyK structure are
smaller for the a ⁄ b domain than for the ... coli phytase, glucose-
1-phosphatase and human prostatic-acid phosphatase. The polypeptide
chain is organized into an a and an a ⁄ b domain, and the active site is
located in a positively charged ... substrate-free
AppA the C
a
atoms are 2.41 A
˚
apart, whereas for the
substrate-free PhyK and the substrate-loaded AppA
the averaged distance is only 1.87 A
˚
.
Distinct conformational changes were observed...
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Tài liệu Báo cáo khoa học: Evidence that the assembly of the yeast cytochrome bc1 complex involves the formation of a large core structure in the inner mitochondrial membrane pdf
Ngày tải lên :
18/02/2014, 08:20
... because of the absence of the catalytic
subunit ISP (Table 1). Figure 3A shows that a band of
approximately 500 kDa was also found in this mutant
strain when the mitochondrial membranes were ana-
lyzed ... dimerization of the bc
1
complex at
this stage (i.e. just after the addition of ISP and Qcr10p).
On the other hand, in the transition from the 500 kDa
band to the 670 kDa band, a structural rearrangement
of ... were of
analytical grade.
Yeast strains and growth media
The genotypes and sources of the S. cerevisiae strains are
described in Table 2. The ISP deletion strain was
prepared in accordance with the...
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Tài liệu Báo cáo khoa học: ˚ The 1.8 A crystal structure of a proteinase K-like enzyme from a psychrotroph Serratia species docx
Ngày tải lên :
19/02/2014, 07:20
... SPRK also has an aspar-
tic acid residue at position at 200, and with the same
conformation as in the two other structures, but
Asp200 forms a salt bridge to Lys253 (Ala253 and
Asn250 in PRK and ... [18]. The biophysical characteri-
zation of SPRK did not reveal the classical cold adap-
ted features [19], but still initial comparative studies
showed that the catalytic turnover was at least ... reported.
Results and discussion
Crystallization, data collection and refinement
Crystals of the catalytic domain of the Serratia prote-
inase K (SPRK) grew within a few days to thin hexa-
gonal plates growing...
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Tài liệu Báo cáo khoa học: "The Utility of a Graphical Representation of Discourse Structure in Spoken Dialogue Systems" ppt
Ngày tải lên :
20/02/2014, 12:20
... system. Also, their underlying
task (air travel domain) is much simpler than our
tutoring task. In addition, the SIH is not always
available and users have to activate it manually.
Other visual ... hints/de-
scribes the answer, each discourse segment has an
additional purpose annotation that is displayed
when the segment is part of the visible horizon.
Auto-collapse. To reduce the amount of infor-
mation ... also have an
equivalent in a new domain (e.g. displaying the
recognized user answer can be the equivalent of
the correct answers). Other NM usages can also be
imagined: e.g. reducing the length...
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Báo cáo khoa học: Structure of Streptococcus agalactiae serine⁄threonine phosphatase The subdomain conformation is coupled to the binding of a third metal ion pptx
Ngày tải lên :
07/03/2014, 09:20
... Hospital and Regional Medical Center, Seattle, WA, USA
Protein phosphatases are primarily classified on the
basis of the type of the amino acid they dephosphory-
late, serine ⁄ threonine phosphatases ... fused to an EF-hand motif, and human STP
(HsSTP), which has an additional 8 kDa a- helical
domain at the C-terminus [3,4].
The sizes of the catalytic domains of both PPP and
PPM families are well ... kinase and adenylosuccinate syn-
thase, but not in S. agalactiae CovR ⁄ CsrR. The motif
is located at the surface of the SaPPase (Rantanen,
unpublished), and superposition of the prolines allows
superposition...
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Báo cáo khoa học: Structure of the complex of a yeast glucoamylase with acarbose reveals the presence of a raw starch binding site on the catalytic domain doc
Ngày tải lên :
07/03/2014, 12:20
... GLU H44 7A forward (5¢- GCAAGTCATTT
TGGATGCTATTAATGATGATGGCTC-3¢), GLU H44 7A
reverse (5¢- GAGCCATCATCATTAATAGCATCCAAAA
TGACTTGC-3¢); GLU T46 2A forward (5¢- GAACAACTT
AACAGATATGCCGGTTATT CCACCGGT ... as a
template. The following oligonucleotides were used: GLU
R1 5A forward (5¢-ATTCAAACTATAAAGTTGACGCAA
CTGACTTGGAAACCTTC-3¢), GLU R1 5A reverse (5¢-
GAAGGTTTCCAAGTCAGTTGCGTCAACTTTATAGTT
TGAAT-3¢); ... GLU
T46 2A reverse (5¢- GGCACCGGTGGAATAACCGGCA
TATCTGTTAAGTTGTTC-3¢); GLU H44 7A, D45 0A for-
ward (5¢-GCAAGTCATTTTGGATGCTATTAATGCTG
ATGGCTCCTTGAATGAAC-3¢), GLU H44 7A, D45 0A
Fig. 7. Adsorption to raw...
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ASSESSMENT OF THE BENEFITS OF EXTENDING THE TROPICAL RAINFALL MEASURING MISSION A PERSPECTIVE FROM THE RESEARCH AND OPERATIONS COMMUNITIES doc
Ngày tải lên :
22/03/2014, 23:20
... radar
forecasting** inspace*
• Another year of TMI data for • Improved forecasts from the operational
numerical weather prediction** assimilation of PR and TMI data into
• Another year of PR and ... National
Environmental Satellite, Data, and Information Service Satellite Analysis Branch.
The Satellite Analysis Branch uses TMI to augment other sources of data to their
real-time, operational rainfall estimation ... in
1. climate and weather research (e.g., a reliable seven-year climatolo-
gy of the mean annual tropical rainfall and its interannual and diurnal cy-
cles; fundamental new information on the synoptic...
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The Duality of Memory and Communication in the Implementation of a Multiprocessor Operating System
Ngày tải lên :
12/09/2012, 15:05
... prevent.
• Data manager changes data. A malicious data manager may change the value of its data on each cache
refresh. While this is an advantage for shared memory applications, it is a serious ... temporarily allow read-only access to cached data. The locking on a page may later be changed as deemed
necessary by the data manager. [To avoid race conditions, the pager_data_provided call also ... to the default pager is identical to other external data managers, there are no fundamental
assumptions made about the nature of secondary storage. For example, the default pager may use local...
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List the components of a radio system
Ngày tải lên :
13/09/2012, 10:52
... sent
–
Imprints a unique address on the data
–
The longer the code is, the more users will be able to
share the same channel
–
Number of chips in the code
•
Determines the amount of spreading or bandwidth
Wireless ... (TDMA)
–
Divides the transmission time into several slots
–
Each user is assigned the entire frequency for the
transmission
•
For a fraction of time on a fixed, rotating basis
–
Advantages
•
Uses the bandwidth ... strength falls near the level of noise
–
Interference can take place
•
To reduce the interference of noise
–
Boost the strength of the signal
–
Use of filters when receiving the signal
•
Attenuation
–
A...
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Cambridge.University.Press.Africans.The.History.of.a.Continent.Aug.2007.pdf
Ngày tải lên :
21/09/2012, 10:39
... lineages of
mitochondrial DNA exist among the San (‘Bushmen’) of southern Africa and
the Biaka Pygmies of the modern Central African Republic. About 100,000 years
ago, some of these anatomically ... common in the East African highlands by 20,000 years
ago, appeared at that date also in southern Africa, spread into western and
northern Africa during the next 10,000 years, and thereafter became ... that it awaits further confirmation.
8
The forest margin of Cameroun and Nigeria was the region from which
Bantu speakers gradually expanded throughout the southern half of Africa. All
Bantu languages...
386
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4
Guest the meaning of a word
Ngày tải lên :
02/10/2012, 12:07
... guest the meaning of a word
Could you guest the sign of a new word?
Yes, Of couse. This is 20 prefix and 14 root-word helping you improve your vocabulary.
You can guest the meaning of 14.000 ... hurl, cast)].
offer: ob-và ferre [Gồm các biến dạng fer và lat (Latin: line, bring, carry)].
insist: in-và stare [Các biến dạng c a stare là sta, stat, sti, và sist (Greek: standing, stay,
make ...
talk,
speech, speak; word)].
aspect: ad-và specere [Gồm có 2 dạng spec và spic (Latin: see, sight, look, appear, behold,
and examine)].
uncomplicated: un-, com-,và plicare [Có 11 biến dạng sau:...
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Báo cáo y học: "The Impact of a Nationwide Antibiotic Restriction Program on Antibiotic Usage and Resistance against Nosocomial Pathogens in Turkey"
Ngày tải lên :
25/10/2012, 11:00
... and Methods: The data obtained from all of the four university hospitals, and
one referral tertiary-care educational state hospital in Ankara. Antimicrobial resistance
profiles of 14,233 selected ...
Hospital setting and antibiotic policy: NARP
was initiated in Turkey in February 2003 by a central
regulation of Ministry of Health and was announced
nation-wide via official newspaper of the ... we have esca-
lated all antibiotic prices. The cost of antibiotics was
calculated as US dollars (USD).
Statistical Analysis: Rates in every 6 months
periods of the study period were analyzed...
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