Greek language

Avaris (Egyptian: ḥw.t wꜥr.t, sometimes hut-waret; Ancient Greek: Αὔαρις, romanized: Auaris; Greek: Άβαρις, romanized: Avaris; Egyptian Arabic: اڤاريس, romanized: Avaris) was the Hyksos capital of Egypt located at the modern site of Tell el-Dab'a in the northeastern region of the Nile Delta. As the main course of the Nile migrated eastward, its position at the hub of Egypt's delta emporia made it a major capital suitable for trade. It was occupied from about the 18th century BC until its capture by Ahmose I.

Middle Egypt (Arabic: مِصْر ٱلْوِسْطَى, romanized: Miṣr al-Wisṭā) is the section of land between Lower Egypt (the Nile Delta) and Upper Egypt, stretching upstream from Asyut in the south to Memphis in the north. At the time, Ancient Egypt was divided into Lower and Upper Egypt, though Middle Egypt was technically a subdivision of Upper Egypt. It was not until the 19th century that archaeologists felt the need to divide Upper Egypt in two. As a result, they coined the term "Middle Egypt" for the stretch of river between Cairo and the Qena Bend. It was also associated with a region termed "Heptanomis" (/hɛpˈtænəmɪs/; Greek: ἡ Επτανομίς, in Ptol. iv. 5. § 55; more properly Ἑπτὰ Νομοί or Ἑπταπολίς, in Dionysius Periegetes 251; and sometimes ἡ μεταζύ[γή]; meaning "Seven Nomes", a "nome" being a subdivision of ancient Egypt), generally as the district which separates the Thebaïd from the Delta.

Middle Egypt today can be identified as the part of the Nile Valley that, while geographically part of Upper Egypt, is culturally closer to Lower Egypt. For instance, in terms of language, the Egyptian Arabic of people in Beni Suef and northwards shares features with Cairene and particularly rural Delta Arabic rather than with the Sa'idi Arabic spoken further south, and are often not considered Sa'idis.

Heraclius (Greek: Ἡράκλειος, romanized: Hērákleios; c. 575 – 11 February 641) was Byzantine emperor from 610 to 641. His rise to power began in 608, when he and his father, Heraclius the Elder, the Exarch of Africa, led a revolt against the unpopular emperor Phocas.

Heraclius's reign was marked by several military campaigns. The year Heraclius came to power, the empire was threatened on multiple frontiers. Heraclius immediately took charge of the Byzantine–Sasanian War of 602–628. The first battles of the campaign ended in defeat for the Byzantines; the Persian army fought their way to the Bosphorus but Constantinople was protected by impenetrable walls and a strong navy, and Heraclius was able to avoid total defeat. Soon after, he initiated reforms to rebuild and strengthen the military. Heraclius drove the Persians out of Asia Minor and pushed deep into their territory, defeating them decisively in 627 at the Battle of Nineveh. The Persian Shah Khosrow II was overthrown and executed by his son Kavad II, who soon sued for a peace treaty, agreeing to withdraw from all occupied territory. This way peaceful relations were restored to the two deeply strained empires.

Doctrine (from Latin: doctrina, meaning 'teaching, instruction') is a codification of beliefs or a body of teachings or instructions, taught principles or positions, as the essence of teachings in a given branch of knowledge or in a belief system. The etymological Greek analogue is 'catechism'.

Often the word doctrine specifically suggests a body of religious principles as promulgated by a church. Doctrine may also refer to a principle of law, in the common-law traditions, established through a history of past decisions.

Japheth /ˈdʒeɪfɛθ/ (Hebrew: יֶפֶת Yép̄eṯ, in pausa יָפֶת‎ Yā́p̄eṯ; Greek: Ἰάφεθ Iápheth; Latin: Iafeth, Iapheth, Iaphethus, Iapetus; Arabic: يافث Yāfith) is one of the three sons of Noah in the Book of Genesis, in which he plays a role in the story of Noah's drunkenness and the curse of Ham, and subsequently in the Table of Nations as the ancestor of the peoples of the Aegean Sea, Anatolia, Caucasus, Greece, and elsewhere in Eurasia. In medieval and early modern European tradition he was considered to be the progenitor of the European peoples.

In biology, a pathogen (Greek: πάθος, pathos "suffering", "passion" and -γενής, -genēs "producer of"), in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ.

The term pathogen came into use in the 1880s. Typically, the term pathogen is used to describe an infectious microorganism or agent, such as a virus, bacterium, protozoan, prion, viroid, or fungus. Small animals, such as helminths and insects, can also cause or transmit disease. However, these animals are usually referred to as parasites rather than pathogens. The scientific study of microscopic organisms, including microscopic pathogenic organisms, is called microbiology, while parasitology refers to the scientific study of parasites and the organisms that host them.

Kleptoplasty or kleptoplastidy is a process in symbiotic relationships whereby plastids, notably chloroplasts from algae, are sequestered by the host. The word is derived from Kleptes (κλέπτης) which is Greek for thief. The algae is eaten normally and partially digested, leaving the plastid intact. The plastids are maintained within the host, temporarily continuing photosynthesis and benefiting the host.

A cephalopod /ˈsɛfələpɒd/ is any member of the molluscan class Cephalopoda /sɛfəˈlɒpədə/ (Greek plural κεφαλόποδες, kephalópodes; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers and Swedes sometimes call cephalopods "inkfish", referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology.

Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by Nautilus and Allonautilus. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been identified. Two important extinct taxa are the Ammonoidea (ammonites) and Belemnoidea (belemnites). Extant cephalopods range in size from the 10 mm (0.3 in) Idiosepius thailandicus to the 700 kilograms (1,500 lb) heavy colossal squid, the largest extant invertebrate.

Chlorella is a genus of about thirteen species of single-celled or colonial green algae of the division Chlorophyta. The cells are spherical in shape, about 2 to 10 μm in diameter, and are without flagella. Their chloroplasts contain the green photosynthetic pigments chlorophyll-a and -b. In ideal conditions cells of Chlorella multiply rapidly, requiring only carbon dioxide, water, sunlight, and a small amount of minerals to reproduce.

The name Chlorella is taken from the Greek χλώρος, chlōros/ khlōros, meaning green, and the Latin diminutive suffix -ella, meaning small. German biochemist and cell physiologist Otto Heinrich Warburg, awarded with the Nobel Prize in Physiology or Medicine in 1931 for his research on cell respiration, also studied photosynthesis in Chlorella. In 1961, Melvin Calvin of the University of California received the Nobel Prize in Chemistry for his research on the pathways of carbon dioxide assimilation in plants using Chlorella.

In botany, a stoma (pl.: stomata, from Greek στόμα, "mouth"), also called a stomate (pl.: stomates), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange between the internal air spaces of the leaf and the atmosphere. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that regulate the size of the stomatal opening.

The term is usually used collectively to refer to the entire stomatal complex, consisting of the paired guard cells and the pore itself, which is referred to as the stomatal aperture. Air, containing oxygen, which is used in respiration, and carbon dioxide, which is used in photosynthesis, passes through stomata by gaseous diffusion. Water vapour diffuses through the stomata into the atmosphere as part of a process called transpiration.