Results 91 to 100 of about 4,375,437 (297)

Sample size for ophthalmology studies.

open access: yesIndian journal of ophthalmology, 2000
Knowledge and the usage of actual sample size formulae are a necessity as validity of the inferences from research studies is often dependent on this. This paper explains how sample sizes are calculated. The concept of sampling variation is explained to emphasize the need for its proper calculation.
Naduvilath Thomas   +2 more
openaire   +2 more sources

MAPPING GENES FOR QUANTITATIVE TRAITS USING SELECTED SAMPLES OF SIBLING PAIRS [PDF]

open access: yes, 2004
One of the most important research areas in human genetics is the effort to map genes associated with complex diseases such as cancer, heart disease, and diabetes.
Szatkiewicz, Jin Peng
core  

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

open access: yesFEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Amostragem em pesquisas qualitativas: proposta de procedimentos para constatar saturação teórica

open access: yesCadernos de Saúde Pública
A transparência metodológica na pesquisa qualitativa é fator que contribui para sua confiabilidade, devendo ser garantida pelos pesquisadores. A utilização do critério de fechamento amostral por saturação é freqüente, entretanto a maneira como este ...
Bruno Jose Barcellos Fontanella   +5 more
doaj  

Robust Influence Maximization

open access: yes, 2016
In this paper, we address the important issue of uncertainty in the edge influence probability estimates for the well studied influence maximization problem --- the task of finding $k$ seed nodes in a social network to maximize the influence spread.
Chen, Wei   +4 more
core   +2 more sources

Mapping the evolution of mitochondrial complex I through structural variation

open access: yesFEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin   +2 more
wiley   +1 more source

Estimativas obtidas de um levantamento complexo

open access: yesRevista de Saúde Pública
OBJETIVO: Avaliar o impacto do plano de amostragem e o efeito da ponderação, em dados provenientes da "Pesquisa Nacional sobre Demografia e Saúde" (PNDS-96).
Maria Helena de Sousa   +1 more
doaj  

Protocol for efficient plasma sampling for low density lipoprotein turnover studies.

open access: yesJournal of Lipid Research, 1984
Radiolabeled low density lipoprotein (LDL) is commonly used to study the turnover of LDL apolipoprotein B (apoB), the major protein component of LDL. Following an intravenous injection of radioiodinated LDL, typical sampling schedules have including 20 ...
N A Le, H N Ginsberg, W V Brown
doaj   +1 more source

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