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匹配条件: “Raz” ,找到相关结果约211条。
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Perspectives on the Efficacy of Antidepressants for Child and Adolescent Depression.
Raz
PLOS Medicine , 2005,
Abstract:
Perspectives on the Efficacy of Antidepressants for Child and Adolescent Depression
Amir Raz
PLOS Medicine , 2006, DOI: 10.1371/journal.pmed.0030009
Abstract:
The function and regulation of vasa-like genes in germ-cell development
Erez Raz
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-3-reviews1017
Abstract: In sexually reproducing organisms, primordial germ cells (PGCs) give rise to gametes that are responsible for the development of a new organism in the next generation. These cells must remain totipotent - able to differentiate into each and every cell type of all the different organs. In many organisms, maintenance of totipotency is achieved by the specification of germ cells early in embryogenesis: a small group of cells is set aside to follow a unique pathway of differentiation into gametes (reviewed in [1,2,3]).Information on the specification of PGCs has been gained from detailed microscopical analysis, embryological experiments (for example transplantation of cells or cytoplasm) and gene identification through genetic screens for maternal-effect mutations in Drosophila and Caenorhabditis elegans (reviewed in [1,2,3,4]). The main conclusion from these two invertebrate model organisms is that asymmetrical localization of cytoplasmic determinants - the germ plasm - is responsible for the early specification of the germline lineage. The importance of localized cytoplasmic determinants for germ-cell development has been most clearly shown in Drosophila. Here, for example, cytoplasmic germ plasm determinants concentrated at the posterior pole of the embryo in 'pole plasm' can direct cells towards a germ-cell fate when transplanted to an ectopic location. In mutants in which the formation of this morphologically characteristic cytoplasm is disrupted, germ-cell formation is impaired (reviewed in [5]). The pole plasm is characterized by the presence of the polar granules, electron-dense structures not delimited by a membrane that contain many RNAs and proteins and that are associated with mitochondria. The distribution of the pole plasm correlates with the site of PGC formation. On the basis of their unique morphology, germ plasm components have also been identified in other organisms such as C. elegans (where they are termed P granules), Xenopus laevis (germinal granul
Naval Flanking in Ground Warfare
Gideon Raz
Military and Strategic Affairs , 2011,
Abstract: The Mediterranean Sea, Israel’s only open border, also borders Israel’s enemies to the north and the Gaza Strip to the south, thereby linking it to enemy states. Thus, Israel’s control of this naval arena would enable it to project military strength from the sea, and afford it the capability to embark on landing operations of various types. “The shores of the State of Israel, the naval interface with each of our enemies, require us to expand our naval strength to the point of being able to land forces from the sea. David Ben-Gurion even said that we are bound to view the sea as Israel’s extended western territory.” The naval arena is the Achilles’ heel of Israel’s enemies and therefore also an opportunity for the IDF.However, even if Israel enjoys superiority in the naval arena, it is clear that the battle cannot be decided at sea. In fact, the IDF has aerial and naval superiority, two essential components for the existence of a naval anking option. In constructing a larger amphibious force, the IDF would be able to translate its naval superiority into a signi cant contribution for attaining decisions in ground battles. The essay below examines the components of the landing process and offers some recommendations on construction of this type of force.
Naval Firepower and its Role in Land Battles
Gideon Raz
Military and Strategic Affairs , 2010,
Abstract: Inside the crowded geo-strategic box that is Israel’s domain, the western sector is the only open border and is thus both the Achilles’ heel of Israel enemies and a great opportunity for the IDF. At the same time, technological improvements on the enemy’s side and its growing arsenal of a wide range of rockets and missiles are a severe threat to Israel in every land battle. In the sea domain the navy enjoys many advantages: it is a constant presence in the arena, it is dif cult to track, its activity is possible in almost every weather condition, the sea medium affords ways to avoid detection, it operates beyond range of enemy’s weapons (which is not the case for most air force and ground troops bases), and it allows a large scope of armaments on a single naval platform. The IDF must build its naval force to take advantage of this situation. The IDF has yet to realize the full potential of incorporating naval force as an integral part of land battles using accurate long range missiles red in salvoes from the sea.Over the last decade, several dramatic changes in the nature of war have taken place in the Middle East, requiring thought, analysis, and lesson-learning – i.e., a different implementation of operational action.
Quantum Information and the PCP Theorem
Ran Raz
Physics , 2005,
Abstract: We show how to encode $2^n$ (classical) bits $a_1,...,a_{2^n}$ by a single quantum state $|\Psi>$ of size O(n) qubits, such that: for any constant $k$ and any $i_1,...,i_k \in \{1,...,2^n\}$, the values of the bits $a_{i_1},...,a_{i_k}$ can be retrieved from $|\Psi>$ by a one-round Arthur-Merlin interactive protocol of size polynomial in $n$. This shows how to go around Holevo-Nayak's Theorem, using Arthur-Merlin proofs. We use the new representation to prove the following results: 1) Interactive proofs with quantum advice: We show that the class $QIP/qpoly$ contains ALL languages. That is, for any language $L$ (even non-recursive), the membership $x \in L$ (for $x$ of length $n$) can be proved by a polynomial-size quantum interactive proof, where the verifier is a polynomial-size quantum circuit with working space initiated with some quantum state $|\Psi_{L,n} >$ (depending only on $L$ and $n$). Moreover, the interactive proof that we give is of only one round, and the messages communicated are classical. 2) PCP with only one query: We show that the membership $x \in SAT$ (for $x$ of length $n$) can be proved by a logarithmic-size quantum state $|\Psi >$, together with a polynomial-size classical proof consisting of blocks of length $polylog(n)$ bits each, such that after measuring the state $|\Psi >$ the verifier only needs to read {\bf one} block of the classical proof. While the first result is a straight forward consequence of the new representation, the second requires an additional machinery of quantum low-degree-test that may be interesting in its own right.
$P \ne NP$, propositional proof complexity, and resolution lower bounds for the weak pigeonhole principle
Ran Raz
Computer Science , 2003,
Abstract: Recent results established exponential lower bounds for the length of any Resolution proof for the weak pigeonhole principle. More formally, it was proved that any Resolution proof for the weak pigeonhole principle, with $n$ holes and any number of pigeons, is of length $\Omega(2^{n^{\epsilon}})$, (for a constant $\epsilon = 1/3$). One corollary is that certain propositional formulations of the statement $P \ne NP$ do not have short Resolution proofs. After a short introduction to the problem of $P \ne NP$ and to the research area of propositional proof complexity, I will discuss the above mentioned lower bounds for the weak pigeonhole principle and the connections to the hardness of proving $P \ne NP$.
Survival Effect of Tube Feeding in Patients with Advanced Dementia and Comorbidities  [PDF]
Efraim Jaul, Raz Levin, Jacob Menczel
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.511083
Abstract:

Patients suffering from advanced dementia who have difficulties in eating and swallowing are often tube fed (TF). They suffer, on most occasions, from additional diseases. The effect of tube feeding in advanced dementia patients is controversial and is largely discussed in the medical literature. The purpose of the present study, is to report the effect of tube feeding on the survival time in patients with advanced dementia who suffered from additional diseases. One hundred and forty nine patients with Functional Assessment Stage of Alzheimer Disease (FAST) stage 5>, hospitalized in skilled geriatric nursing department between July 2008 and December 2011 were included in the study. Oral and tub feeding was decided following the evaluation by speech therapists at admission. 99 (66.5%) of the patients were tube fed and 50 (33.5%) received oral feeding at admission. The mean age was 80 ± 11. Sixty four percent of the patients were admitted from general hospitals. Comorbidities were significantly higher in the tube fed group, median survival time was 164 days. The median survival time of the OF group was 78 days (χ2 = 0.94; p = 0.33). Prevalence of tube feeding increased significantly from 53.85% to 90.9% in patients with 3 risk factors such as pressure ulcers, low Hgb and low BMI. The survival time of the tube fed patients was longer compared to patients who were orally fed. Tube feeding in patients with dementia continues to be controversial, and additional researchable data are helpful in the decision to insert a tube.

Present and Future: Pharmacologic Treatment of Obesity
Mariela Glandt,Itamar Raz
Journal of Obesity , 2011, DOI: 10.1155/2011/636181
Abstract: Obesity now presents one of the biggest health problems of our times. Diet and exercise are best for both prevention and treatment; unfortunately, both require much discipline and are difficult to maintain. Medications offer a possible adjunct, but their effect is modest, they are limited by side effects, and the weight loss lasts only as long as the drug is being taken, since as soon as treatment is stopped, the weight is regained. Sibutramine, a sympathomimetic medication which was available for long-term treatment, is the most recent of the drugs to be withdrawn from the market due to side effects; in this case it was an increased risk of cardiovascular events. This paper reviews those medications which are available for treatment of obesity, including many of those recently taken off the market. It also discusses some of the newer treatments that are currently being investigated.
Fiebrefobia
Razón Behar,Roberto;
Revista Cubana de Pediatr?-a , 2011,
Abstract: phobic fever is a term expressing the fear of parents and physicians in face of the presence of fever in the child. in cuba there is great anxiety when temperature in over the 38o c thus, it is important train parents on the significance of not start the antithermal until temperature reach 38,5o c (axillary temperature) and if it is possible 39o c. a subject review was performed and also of other important features related to fever.
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